3SK166A dual gate GaAs MES FET replacement?

Question

Hello, I work at a physics lab and we have some custom hardware that have been developed by researches along the years. We are trying to fix one of them, but it uses a component that we are having a hard time to find: It is a N-channel dual gate GaAs MES FET by Sony called 3SK166A.

We need help finding a compatible replacement for this component. Any suggestion?

Thanks a lot in advance.

Regards, Cassiano

mroberds · Accepted Answer

Crossposted and followup-to  .  wrote: Just from Googling, one broker claims to have stock on a 3SK166, 3SK166-1, and 3SK166A.  I have never dealt with this broker before.  Brokers like this one buy up inventories of old parts from other suppliers, and/or send out random parts with false part numbers on them. Sometimes you will get the genuine part at a bargain price, and sometimes you will get a part that does not work at all. I have cross-posted this reply to  which is much more active than  .  It also has people smarter than I am who might be able to suggest a replacement.  :) What claims to be the Sony datasheet is available at:   Some of the interesting parameters seem to be: Vds 8 V, Vgs -6 V, Id 80 mA, Pd 150 mW, gain about 20 dB.  The datasheet gives S parameters and noise figures for a range of 200 to 2,000 MHz.  The package is a Sony M-254; it doesn't list an EIA or JEDEC package code. Standard disclaimers apply: I don't get money or other consideration from any companies...

JW · Answer

They seem to have an Ebay presence as well, selling this part. It may be easier getting it from there.

David Snowdon · Answer

Hi, I have some 3SK166 (not -A) dual-gate FETs that I purchased as  surplus stock from Down East Microwave Inc some years ago. If you are interested I can mail you a couple of them at no cost. Just e-mail me your mail address and I'll ship them out to you. David  Toronto, CANADA  wrote:  > developed by researches along the years. We are trying to fix one of  them,  > but it uses a component that we are having a hard time to find: --- This email is free from viruses and malware because avast! Antivirus protection is active.

Ian Field · Answer

If it doesn't absolutely have to be a GaS MESFET, the LO FET in a band IV/V UHF tuner will beat the original on maximum frequency and only slightly more noise figure.

IIRC, these are usually depletion mode DG-MOSFETs.

3SK166A dual gate GaAs MES FET replacement?

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