FA-2 26GHz frequency counter prescaler. Need help with IC recognition

[Aleksandrs_S]

Hello!
I bought FA-2 Frequency counter (26.5Ghz version) and it worked fine up to 24GHz
After a few months it stopped working (the reason is not clear to me, maybe ESD), but the input RF power was definitely not exceeded.
I bought another one of the same device (again Eur 420)
a few months later the situation repeated itself with new device
after a short investigation I found out that the input prescaler is damaged
I set jumper between prescaler input and output. Freq on display is multiplied by 8 of actual frequency.
what i know about this IC
Max freq - 26.5Ghz Min 200 Mhz (maybe lower, but not tested)
Power supply voltage - +3.3V
Diff Input and Diff output
All other pins and pad connected to GNG



Please help recognize the prescaler chip. Marking code S004 SSZD6
or suggest alternatives (I haven't found a suitable alternative in stores. Or a different supply voltage or a different frequency range or a different pinout)
Thanks!

[hugen]

If you can modify pin14 to VCC and provide 5V VCC, you can use the HMC494 replacement.

[fzabkar]

FWIW, "C74" can operate at 5V.

https://ww1.microchip.com/downloads/en/devicedoc/21828f.pdf

[BigBoss]

It's probably this
https://www.analog.com/en/products/hmc862a.html