Pre-biased PNP in SOT-23 — what it replaces
The Infineon BCR573E6327HTSA1 is a PNP pre-biased transistor — a digital transistor with two integrated bias resistors: 1 kΩ in the base leg (R1) and 10 kΩ from base to emitter (R2). That resistor network eliminates two external passives per channel on the board, which matters when you are packing multiple low-side switches into a tight layout. Rated for 50 V collector-emitter breakdown and 500 mA continuous collector current, it handles general-purpose switching in loads like relays, solenoids, small motors, and indicator LEDs. The 150 MHz transition frequency keeps switching losses low for PWM up to a few hundred kilohertz.
Infineon has marked the BCR573E6327HTSA1 as Last Buy. That means the manufacturer is taking final orders before the part is discontinued — there is a finite window to secure production quantities or to qualify a drop-in replacement. For a BOM that already uses this part, the procurement action is to assess remaining lifetime demand and place a last-time buy, or to begin evaluating a pin-compatible pre-biased PNP from the same or another supplier.
Sourcing reality — quoted to order
Because the BCR573E6327HTSA1 is in Last Buy, standard distributor stock may be limited or already depleted. If you have a BOM line that needs filling, send the quantity and target date-code window and we will check the open market.