60 V, 600 mA PNP in PG-SOT23 — what it handles
The Infineon MMBT2907ALT1HTSA1 is a PNP general-purpose switching transistor in a PG-SOT23 package. The transition frequency of 200 MHz suits moderate-speed switching and driver circuits — relay coils, small-signal loads, and level translation where a PNP pull-up is needed.
Last Buy — plan the BOM line now
That means the manufacturer has announced end-of-life and the final order window is open. If this transistor is on your BOM, the decision is whether to secure a last-time-buy quantity or qualify a replacement before supply tightens.
DC current gain and saturation — drive margin check
Minimum DC current gain (hFE) is 100 at 150 mA collector current with 10 V VCE. That gives a solid forced-beta of 10 or better for saturated switching at moderate currents. The VCE(sat) max is 1.6 V at 50 mA base drive and 500 mA collector current — a typical Darlington-driver or relay-coil sink scenario. For linear operation, the gain holds well into the hundreds of milliamps range.