What will you do when the parts that need to be replaced have been discontinued?

posted in: Frequency Controlled Parts | 0

<Reprinted from NEC website>

Do you know the NEC PC-98 series?

The PC98 series was a 16-bit machine released in the 1980s, and at that time it was a PC with a 90% share in Japan as a business purpose, specializing in high-definition graphic processing. However, after entering the Internet era, Microsoft’s OS Windows 95 and versatile DOS / V machines increased so that models released in June 2000 are stopped to be released by the end of 2003.

I do not want to talk about old PC98 series. Actually, even now this PC 98 series is being sold for second-hand goods and trading at high price. If it is actually only used by core fans, so large transactions will not last, but there are still many PC98 series currently in operation as factory production lines. Not only are companies that can not invest in production facilities, they are used in production lines of companies that you know, such as automobiles, infrastructure, and train production. For this reason, the breakdown of parts means stopping the production line, and the person in charge is struggling for finding the part whose product guarantee has expired in case of failure.

Under such circumstances, it is trading at the price of exceptional even in the trading of the second-hand goods and repair shop and the Internet of the PC-98 series. There are many companies that introduce the current system in the case of new construction or relocation of factories in fact, but there are things that can not be changed from long-selling systems that are time consuming It is. It is not easy to update such a system easily in consideration of the loss in the case where the production line can not be stopped simply or when the trouble occurs in the transition of the system.

Therefore, although the production quantity is small, there are many parts that are required for a long time.

Especially in the production line of industrial equipment, it is necessary for each company to carry out considerably elaborate investigation on system replacement and to devote time and labor to replacing the system.

The same thing is also required at the site of infrastructure and introduction of a new system is postponed unless budget is attached, risk of failure naturally rises.

Also, in certain systems on the production line, it is not unusual that the workers at the work site maintain their own programs on the spot on the spot. Even if another person in charge sees the inside of the program afterwards, this will cause many occurrences which do not clearly know how the program was added later.

For these reasons, we often receive inquiries from the production site for products that are no longer in the market.

There are several ways to respond to the restoration of a system including such discontinued products. If the failed part of the system can not be specified, replace the board and restore it. (This is the most difficult to obtain the board for restoration.) Also, if the failed part can be identified, replace the failed part. Parts are also various, but parts such as ICs, capacitors, and transistors are often different from those currently selling even those of the same specification.

As an example, in the case of IC, change from IC vendor of pin-compatible model and other parts manufacturer to IC which operates similarly to the faulty part.

Crystal related timing devices currently handled by our company may also receive inquiries from such customers.

Along with the evolution of communication equipment, the size of each part is smaller and power consumption (supply voltage, current consumption) is required to be smaller. The same thing is required for crystal oscillator and oscillator using crystal, and the latest crystal oscillator is commercially available with 1.6 mm * 1.0 mm.

In the development of new products, it is inevitable to adopt a crystal with a small crystal size and a low power consumption, but the crystal used for the main substrate in the existing system is small in size or low in voltage It is still visible even if it is not.

In the case of repairing an existing system or replacing parts only, there are many cases where the board maker has already become a discontinued product when looking for a replacement for the crystal oscillator or the crystal oscillator which was previously used. Along with the development of the miniaturization and low power consumption model as in the current crystal maker as mentioned earlier, there are many cases where manufacture corresponding to the existing size and voltage has already been limited or canceled, The person in charge is struggling to find alternative products.

Currently the following items are the products that apply within our products.

Full Size (DIL14)&Half Size(Dil8) SPXO & Full Size(DIL14)& Half Size (DIL8) VCXO

Large Size SMD Crystal Oscillator

5V Operation SPXO & 5V Operation VCXO

Hermetic Seal

All in order to realize the customer’s “I am glad that I was saved.”
Please contact us for details.


Automotive Quartz Device (AEC-Q200 Compliance)

We introduced the next generation communication standard 5G has various possibilities but recently we are seeking collaboration between automobile and communication among them.

In Japan, Toyota Motor establishes a new company in cooperation with Telecommunications Carrier Softbank and is trying to realize Maas (Mobile as a Service) by mutual business collaboration.

This aim is to sell services that can be realized by a mobile called a car rather than selling a car alone.
In addition, it is clear that electric vehicles and hybrid vehicles currently being sold by Tesla Motors etc. will continue to evolve, and the cars themselves will evolve from the framework of machines as the former combustion engine, power generation, storage, car navigation, It is a well-known fact that it converts from an anti-collision automatic brake to an automatic operation in the future.
Crystal-related products sold at our company are also used as automobile parts than before.
In order to be used as a signal source in the automobile, the crystal must pass a variety of provisions. Especially for environmental temperature, operation guarantee in the high-temperature range is necessary to make it possible to use near the engine and motor.
This time we are introducing high-temperature guarantee type crystal products conforming to automotive standard AEC-Q200.
In addition to the industrial temperature range of -40 ° C to + 85 ° C, we are selling quartz units and crystal oscillators that guarantee operation at -40 ° C to + 105 ° C or -40 ° C to + 125 ° C.
The lineup will be as follows.
We realize high-precision temperature characteristics with high frequency which is our characteristic.

Automotive Crystal Products High-Temperature Model(AEC-Q200 Compliance) 

Crystal Unit  (Automotive High-Temperature Model) AEC-Q200 Compliance

Operating Temperature Range: -40℃~+85℃, -40℃~+105℃, -40℃~+125℃

 Model No.Frequency(MHz)Modepackage
AUK-2016HT20.000 - 200.000Fund.2.0mm*1.6mm
AUK-2520HT12.000 - 200.000Fund.2.5mm*2.0mm
AUK-3225HT8.000 - 200.000Fund.3.2mm*2.5mm
AUK-5032HT8.000 - 200.000Fund.5.0mm*3.2mm
AUK-6035HT8.000 - 67.000Fund.6.0mm*3.5mm
AUK-7550HT6.000 -100.000Fund.7.5mm*5.0mm

Crystal Oscillator (Automotive High-Temperature Model) AEC-Q200 Compliance

Operating Temperature Range: -40℃~+85℃, -40℃~+105℃, -40℃~+125℃

 Model No.Frequency(MHz)Logicpackage
AOK-C2016HT1.800 - 170.000CMOS2.0mm*1.6mm
AOK-C2520HT1.800 - 170.000CMOS2.5mm*2.0mm
AOK-C3225HT1.800 - 170.000CMOS3.2mm*2.5mm
AOK-L3225HT40.000 - 250.000LVDS3.2mm*2.5mm
AOK-P3225HT40.000 - 250.000LVPECL3.2mm*2.5mm

For specification details please contact our sales department.
Also, if you inquire about the specifications you want, we will review our technical department, please feel free to contact us.

Crystal Unit

Crystal Oscillator


High-Frequency Fundamental Mode Crystal Resonator for Discrete Filter

posted in: Frequency Controlled Parts | 0

Nowadays, in the telecommunications industry, development is progressing toward the deployment of next-generation communication 5G.
The news such as Apple ‘s IPhoneXs series recently launched and Huawei’ s 5 G compatible folding smartphone next spring release forecasts are broadcasting the telecommunications industry.
Currently, it is expected that communication using 4G and high-speed LTE will be the main in technology development in the pre-stage to become full 5G, but communication terminals at this stage are DSDS (Dual Sim Dual Standby)
It is also expected that it will respond to next-generation high-speed communication by switching the communication network depending on the situation.
Currently, we are developing and marketing products for optical communication and RF modules, which are also used in current 4G and LTE communication networks, as the first stage effort towards this next-generation communication standard 5G.

This time we are introducing a high-frequency fundamental mode crystal resonator for a filter.
It is essential for optical line communication and RF module to extract the necessary signal from the clock signal source passed through the filter with narrow passband width in order to reduce noise and take out a sharper signal.
Also, since the frequency used is increased, it is necessary to have a filter of the characteristic located between the filter using the SAW device and the MCF.
However, with the SAW filter, it is difficult to narrow the pass bandwidth, and at present, the MCF is difficult to handle this high frequency.
Therefore, our company offers a high-frequency crystal resonator for Discrete type Monolithic Crystal Filter being developed by many customers.
In general, MCF has stable frequency characteristics with respect to temperature, low loss, high cutoff characteristics, and excellent aging characteristics compared with other filters, and it is effectively used for the narrowband bandpass filter. In addition, by increasing the number of crystals to use (increasing the number of poles), sharpness in the attenuation region increases, making it possible to manufacture narrowband bandpass filters.
In order to manufacture such an excellent MCF, a high frequency and high precision crystal resonator using a fundamental mode are required.
We mainly offer UM-1 high-frequency fundamental crystal resonator for 4 to 6 pole Discrete type Monolithic Crystal Filter. Our UM-1 high-frequency fundamental crystal quartz resonator is inspecting all waveform characteristics in pre-shipment inspection and contributes to Discrete MCF’s Group Delay reduction.

Crystal Unit for Discrete Filter

We would like to show you our example Crystal Resonator as follows.

Crystal Resonator for Discrete Monolithic Crystal Filter
Frequency122.400MHz Band
122.3260MHz +/-13ppm(Fund.)122.3440MHz +/-13ppm(Fund.)
122.3520MHz +/-13ppm(Fund.)122.4045MHz +/-13ppm(Fund.)
122.4080MHz +/-13ppm(Fund.)122.4250MHz +/-13ppm(Fund.)
122.4300MHz +/-13ppm(Fund.)etc. (Dependent on Customer’s required Frequency)
ESR55Ω max.
Equivalent Inductance1.7mH to 2.1mH
DLD24Ω max.
Temperature Frequency Difference+/-20ppm max.
Excitation Level0.1mW
Operating Temperature-40 to +70deg C
Frequency characteristic curve


Crystal Resonator for Discrete Monolithic Crystal Filter
Frequency124.800MHz Band
124.726MHz +/-15ppm(Fund.)124.744MHz +/-15ppm(Fund.)
124.808MHz +/-15ppm(Fund.)124.830MHz +/-15ppm(Fund.)
etc. (Dependent on Customer’s required Frequency)
ESR55Ω max.
Equivalent Inductance1.6mH typ.
DLD25Ω max.
Temperature Frequency Difference+/-20ppm max.
Excitation Level0.1mW
Operating Temperature-40 to +70deg C


Crystal Resonator for Discrete Monolithic Crystal Filter
Frequency151.800MHz Band
etc. (Dependent on Customer’s required Frequency)
ESR58Ω max.
Equivalent Inductance1.6mH ~ 2.1mH
DLD25Ω max.
Temperature Frequency Difference+/-20ppm max.
Excitation Level0.1mW
Operating Temperature-40 to +70deg C


Crystal Resonator for Discrete Monolithic Crystal Filter
Frequency157.200MHz Band
157.2554MHz+/-20ppm(Fund.)157.1657MHz +/-20ppm(Fund.)
etc. (Dependent on Customer’s required Frequency)
ESR55Ω max.
Equivalent Inductance2.4mH typ.
Temperature Frequency Difference+/-20ppm max.
Excitation Level0.1mW
Operating Temperature-40 to +85deg C


Crystal Resonator for Discrete Monolithic Crystal Filter
Frequency161.800MHz Band
161.7657MHz +/-20ppm(Fund.)161.8554MHz+/-20ppm(Fund.)
etc. (Dependent on Customer’s required Frequency)
ESR55Ω max.
Equivalent Inductance2.4mH typ.
Temperature Frequency Difference+/-20ppm max.
Excitation Level0.1mW
Operating Temperature-40 to +85deg C


Crystal Resonator for Discrete Monolithic Crystal Filter
Frequency75.000MHz Band
74.9240MHz +/-20ppm(Fund.)74.9326MHz +/-20ppm(Fund.)
75.0084MHz +/-20ppm(Fund.)75.0203MHz +/-20ppm(Fund.)
etc. (Dependent on Customer’s required Frequency)
ESR20Ω max.
Equivalent Inductance2.34mH typ.
Temperature Frequency Difference+/-20ppm max.
Excitation Level0.1mW
Operating Temperature-40 to +85deg C


For specification details please contact our sales department.
Also, if you inquire about the specifications you want, we will review our technical department, please feel free to contact us.

Crystal Unit


Next-Generation Mobile Communication 5G

Next-Generation Mobile Communication 5G

Currently, each telecommunications field company is developing products to realize next-generation mobile communication 5G.
This next generation mobile communication standard 5G has the following three features.
1. High-speed large capacity
2. Low latency
3. Simultaneous connection of multiple terminals
We will develop a communication network that will satisfy all of these and start services sequentially. It is not yet decided how to operate with respect to simultaneous multiple terminal connections.
So far Japan has been proceeding with this roadmap to develop this 5G facility targeting the time of the 2020 Tokyo Olympic Games.
However, at the Mobile World Congress (MWC) held in Spain (Madrid) in February 2018, it was announced that mobile communication carriers and communication equipment manufacturers in each country will start commercialization of 5 G communication in 2019, It is necessary to aim at the commercialization of the same operators in various regions including the company ahead of schedule.
Commercialization experiments are planned in the United States and China in 2019 and commercialization experiment in Europe in this year from 2018. The goal of the commercial launch in 2020 in Japan has not changed so far in Japan, but it is also fully conceivable that the start of services will be accelerated due to the influence of other countries.

Changes and improvements in such communication standards will affect not only changes in fields that are limited to mobile communications like 3G to 4G, but also to all devices that can be connected by IOT.
As a simple example, it is expected to be utilized in the following fields.

Video distribution (4K, 8K)
Medical (remote control)
Automobile (automatic driving control)
Robot control (remote control)
Security service (remote monitoring control)
Amusement (video, VR experience)

High speed large capacity communication

High-speed large-capacity communication at 5 G is a communication that can communicate at 20 Gbps at the maximum, about 25 times the maximum of 800 Mbps currently used at 4 G to enable this high-speed and large capacity communication, used in Japan a lot Compared to LTE (3.9 G, currently being interpreted as 4 G in Japan) it is necessary to enable about 100 to 1000 times communication.
Therefore, while using the current 3G and 4G lines, a new communication band: 6 GHz band is used.
This will use higher frequencies than the 5 GHz band used in 2.4 GHz, 11 a, 11 b of the conventional WiFi standard 11 g, 11 b. This 11ac is practically used at a communication speed of 6.9 Gbps, which is about 11.5 times higher than the conventional 11n (the standard that can be used at both 2.4 GHz and 5 GHz).
If you are using a Wifi router at home and you are communicating with the communication standard 11ac, 11ac’s 5 GHz band communication is used in many devices 2.4 GHz band from other devices Although there is no interference, the communication sensitivity of WiFi leaves the WiFi antenna and there is an obstacle directly between the antenna and the mobile terminal, or there is a case that I felt a decrease in communication sensitivity occurring when moving to another room I think. Although increasing the communication frequency keeps straightforwardness, it is impossible to ignore the influence of obstacles and attenuation of communication capacity due to distance.
In order to solve this problem, it is necessary to improve the antenna technology (directivity, beam division multiplexing, use of millimeter waves) to linearly connect the antenna and each mobile terminal, and to increase the number of antenna elements (more than 100 Antenna element), it is necessary to increase the number of base stations themselves, in addition to increasing the antenna controlled by the current one base station to more than 100.

The significant increase in the number of base stations

Although the range covered by the base station at 4 G is about 1 km in radius, the interval between the base stations is calculated to be about 100 m to 200 m in the realization of 5 G, and the base station greatly increases (about 4 to 18 times as calculated) Is required.
Regarding the substantial increase in base stations, whether each type of mobile communication provider will set themselves as before or as common as Korea 4 companies (KT & LGU + & SK Telecom & SK broadband) set up a common base station and mutual use It is currently under consideration in many countries about whether to do.

Low latency

It is decided that the network delay standard in 5G will be 1.0ms or less.
This is a remarkable reduction of delays in current mobile terminals, taking into consideration applications to medical practices, automated driving techniques of automobiles, remote control of robots, etc.
Even in areas where it has been difficult to handle with mobile communication up to 4G, it will lead to technological innovation to many more fields by using this 5G network.
However, in the case of communicating in the order of the conventional terminal, antenna (base station), optical line, server, optical line, antenna (base station) and terminal, the network delay time is 0.5 ms, there is a possibility that a delay of 1.0 ms or more may occur, so communication in the same area will be handled by completing communication by placing a server in the antenna (base station) I will.

Simultaneous connection of multiple terminals

Even when there are many terminals within a certain range, it is necessary to create a mechanism that does not cause communication speed, capacity, and delay. As mentioned above, although we do not know how each company clears this mechanism for this simultaneous multi-terminal connection at present, it is premised that one million crisis per 1 km 2 can be connected to the communication line at the same time.

Method of communication

Construction of a communication network utilizing VSAT (low orbit satellite) as well as communication using optical lines
Although it seems that communication of high speed and large capacity will be performed using the 4G line up to now using the optical line as it is, for the area where the optical line has not arrived, VSAT (low orbit satellite) communication It is also considered to make connections by utilizing them.

The current situation in Japan
The current communication used by the Japanese is considerably proportional to the optical line reaching the home, or the Internet connection using the cable TV line has become widespread, there is not much trouble with the slow communication line. This can be said that there are environments in which it is relatively easy for laying of optical lines and cable television lines from areas with large land such as the United States and China due to the small national land of Japan. Also regarding the cellular phone, the communication using the current 4G line can be handled without problems in a considerable area where the population coverage rate is over 90%, so even opinions like whether the change to 5G is really necessary is heard.
Regarding video (television), 4K and 8K television are currently being released from each manufacturer one after the other in Japan, and many are on the shop front. However, the current Japanese television broadcasting does not deliver 4K and 8K, and even if you purchase 4K, 8K compatible television, it will not benefit from that. Moreover, with the 4K, 8K TV built-in devices currently being sold, it is not possible to display the 4K, 8K distribution that will start in the future, and it is in a state that it is impossible to understand that it is necessary to install new equipment separately in each household.

Our product correspondence
We develop and sell the following products corresponding to 5G next-generation communication standards.
We can offer optical communication products and VSAT products to sequentially shift to 5G via 4.5G using the current 4G communication network.

For base station main unit
Low Phase Noise VCXO 122.880 MHz
Crystal Resonator for Discrete Crystal Filter

UM-1 Fundamental Mode Crystal Unit  122.400 MHz band, 75.000 MHz band, 151.000 MHz band, etc.

VSAT Components Parts
Ku-band C-band VSAT BUC LNB etc.

We will post the product details one by one.
If you have any inquiries about the product, please contact our sales department.








Ultra Low Phase Noise CMOS Crystal Oscillator -AOK-C9070LP-

posted in: Frequency Controlled Parts | 0

Model No. AOK-C9070LP

Frequency: 50.000MHz – 156.250MHz

Package Size: 9.0mm*7.0mm

Logic: CMOS

We are pleased inform you our new Low Phase Noise CMOS Crystal Oscilator Model No. AOK-C9070LP.

This product was developed for mobile communication base 5G mobile base station board etc.
In order to enable communication to high speed and large capacity, against high frequency and low phase noise required for the reference clock.
By configuring this product with discrete, low noise value has been realized compared to the conventional 1-chip type.
It is also used as a clock source for special measurement equipment and medical equipment.

Test Sample: AOK-C9070LP

Frequency: 80.000MHz

Supply Voltage: 3.3V

Unit: dBc/Hz  Measured: E5052B(Agilent)

If you are interested in this Low Phase Noise CMOS Crystal Oscillator, please feel free to contact our sales department.

SPXO Contact

CMOS VCXO Phase Noise Data -AXK-C3225J-

posted in: Frequency Controlled Parts | 0

Frequency: 30.000MHz — 160.000MHz

Package Size: 3.2mm*2.5mm, 5.0mm*3.2mm

Logic: CMOS

About Low Phase Noise & Low Jitter type CMOS VCXO I would like to introduce the sample test data that we had inquiries from various customers.

Test Sample: AXK-C3225J

Frequency: 100.000MHz

Supply Voltage: 3.3V

Control Voltage: 1.65V+/-1.5V

This product is used as a reference clock source in optical communication equipment, wireless communication equipment, audio equipment, medical equipment, defense equipment etc. where size reduction is required. Among them, it is particularly required for boards that require CMOS output waves that are easier to handle than Sine waves or differential amplified waves (LVDS, LVPECL) as the reference clock.

We plan to develop further higher frequency and lower noise products.

If you are interested in this Low Jitter CMOS VCXO, please feel free to contact our sales department.

VCXO & OCXO Contact


New OCXO – Low Phase Noise Type – Released

posted in: Frequency Controlled Parts | 0

We have released New OCXO Low Phase Noise type AXK-OLP series.

OCXO is used as a clock source for high-speed communication boards and measurement equipment.
Compared to conventional products, AXK-OLP series is an excellent product with Phase Noise special product and Aging special product.
Model No. AXK-OLP series
Frequency: 10.000 MHz
Package Size: 20.60 mm * 20.60 mm (5 Pin)
Output: Size Wave
Phase Noise Data@10MHz

AXK-OLP33(3.3V type)AXK-OLP50(5.0V type)
@1Hz-96dBc/Hz typ.-98dBc/Hz typ.
@10Hz-128dBc/Hz typ.-130dBc/Hz typ.
@100Hz-148dBc/Hz typ.-150dBc/Hz typ.
@1kHz-160dBc/Hz typ.-162dBc/Hz typ.
@10KHz-165dBc/Hz typ.-168dBc/Hz typ.
@100kHz-165dBc/Hz typ.-168dBc/Hz typ.

In addition, this product is also highly competitive in terms of price.

If you are interested in our New OCXO, please feel free to contact our sales dept.

VCXO & OCXO Contact


-Crystal Cap for UM-1&UM-5-

posted in: Frequency Controlled Parts | 0
We have received crystal cap for UM-1 & UM-5 crystal unit from new facility.
We are going to inspect these crystal cap performance in our production dept.
At present, SMD products are the mainstream of quartz products, and DIP type crystal products are steadily decreasing.
However, products that require special crystal parameters of DIP also exist deeply, and our company responds and supply it.
Crystal Cap, which is a metal product, also has been stopped manufacturing each company, so it is difficult to obtain it.
Also, Crystal Cap may change the parameters of the crystal due to the difference in manufacturing method even with the same metal, size and treatment.
At our company, we evaluate the performance of Crystal Cap by actually manufacturing the crystal resonator as much as possible before selling Crystal Cap and measuring various parameters.We can supply special crystal unit such as UM-1 for OCXOs etc. If you are interested in our crystal unit and also crystal cap(Hermetic Seal), please kindly contact our sales dept.


New Products -Low Jitter high Frequency CMOS VCXO-

posted in: Frequency Controlled Parts | 0
We have started the production of Low Jitter High Frequency CMOS VCXOs.

Frequency: 30.000MHz — 160.000MHz

Package Size: 3.2mm*2.5mm, 5.0mm*3.2mm

Logic: CMOS

These models are Low Jitter types compared with our previous types.

Phase Jitter value of 12KHz to 20MHz is 0.1ps max.(effective value @100MHz is around 0.061ps to 0.070ps).

If you are interested in this Low Jitter CMOS VCXO, please feel free to contact our sales department.

VCXO & OCXO Contact