The BC817K25E6433HTMA1 is an NPN epitaxial planar transistor from Infineon in a standard SOT-23-3 surface-mount package (PG-SOT23). The DC current gain (hFE) is specified at a minimum of 160 when measured at 100 mA collector current with 1 V VCE, which gives a predictable beta for designs that need consistent gain in the tens-of-milliamps operating region. The transition frequency of 170 MHz is adequate for audio-band and low-speed switching applications; it is not a high-speed RF part. Maximum power dissipation is 500 mW, and the junction temperature rating goes to 150 °C.
Last-time-buy — what it means for procurement
Infineon has placed the BC817K25E6433HTMA1 into Last Buy status. If you have an active BOM line using this order code, now is the time to secure lifetime buy quantities or qualify a replacement. A pin-compatible replacement would need to match the SOT-23-3 footprint, NPN polarity, 500 mA collector rating, and 45 V VCEO — several general-purpose transistors in the BC817 family share these ratings, but the exact hFE bin may differ.