Can you help identify this RF part

[jhormilla]

I have a 1 Watt RF 450 MHz power amplifier and would like to identify the power device (probably a power N-FET) the only marking is "KB" on the final stage of the amplifier. It would be great to get a datasheet for it.

TIA

[fzabkar]

This has the same package and marking code, but doesn't fit the application:

BSS192, Nexperia, P-channel vertical D-MOS transistor, 240V, 200mA, marking KB, SOT89:
https://assets.nexperia.com/documents/data-sheet/BSS192.pdf

Edit:

This page suggests that "KB" is RD01MUS2B:

https://it.aliexpress.com/item/32330083233.html

RD01MUS2B, Mitsubishi, MOSFET Power Transistor for VHF/UHF RF driver device, 527MHz, 1W, 7.2V, marking KB, SOT89:
https://www.mitsubishielectric.com/semiconductors/content/product/highfrequency/siliconrf/discrete/rd01mus2b.pdf

[jhormilla]

Thank you, that looks like it.