Peripheral driver for relay and solenoid loads
The SN75477P: Each of the two elements handles one bit of drive, making it a straightforward fit for driving relays, solenoids, or indicator lamps from a 5 V logic bus without an external transistor stage.
Active lifecycle and through-hole board fit
Listed as Active by Texas Instruments with RoHS3 compliance (ROHS3 Compliant), the SN75477P remains a current-production part suitable for new designs. The 8-DIP (0.300", 7.62mm) through-hole package mates with standard 0.100-inch pitch sockets or solder-in holes — no board respin needed if the existing layout already carries a DIP-8 footprint. Sourced to order through independent distribution; availability and current pricing confirmed at RFQ.
300 mA sink drive — what it means on the bench
The 300 mA per-channel sink rating (Current - Output High, Low: -, 300mA) is the continuous DC limit at the output low state. Driving a 24 V relay coil through this driver requires an external flyback diode across the load — the internal structure does not include a catch diode, so the inductive kickback during turn-off will exceed the absolute maximum voltage rating without one.