500 mA PNP pre-biased switch in SOT-23 — what the ratings mean
The Infineon BCR562E6327HTSA1 is a PNP pre-biased digital transistor in a PG-SOT23 package, rated for 500 mA collector current and 50 V collector-emitter breakdown. The built-in bias resistors — 4.7 kOhms on both the base and emitter-base legs — eliminate the two external resistors normally needed per transistor, saving board area and reducing pick-and-place cost in high-density switching arrays. With a transition frequency of 150 MHz, it handles moderate-speed switching in relay drivers, solenoid drivers, and logic-level interface circuits where the load current stays under half an amp.
Last Buy — sourcing reality for this part
The BCR562E6327HTSA1 carries a Last Buy lifecycle status. This means Infineon has announced end-of-life for this specific order code, and the final production window is closing. For new designs, a pin-compatible pre-biased PNP from the same BCR56x family should be evaluated — the base resistor and emitter-base resistor values are the key differentiators between variants. For existing BOMs already qualified to this exact code, the remaining stock in independent distribution is the available supply.
The maximum Vce saturation is 300 mV at 2.5 mA base current and 50 mA collector current. At the full 500 mA rating, expect the saturation voltage to rise — the datasheet curve shows the typical increase. For a 24 V relay coil drawing 100 mA, the 300 mV drop leaves 23.7 V across the load, which is fine for most industrial relays. But if the load is a 3.3 V logic rail or a low-voltage solenoid, that 300 mV eats into the headroom; a logic-level MOSFET might be a better fit for sub-5 V switching.