Package and mounting
The SN75478P is a dual-channel peripheral driver from Texas Instruments, built to take a 5 V logic-level input and switch up to 300 mA per output into a grounded load — relay coils, small solenoids, incandescent indicators, or LED arrays. It lives in an 8-pin DIP (0.300" body, 7.62 mm row spacing) that fits standard through-hole layouts, so it shows up on older industrial control boards, vending machine controllers, and appliance PCBs where a technician is more likely to reach for a desoldering iron than a hot-air station.
Active lifecycle — no last-time-buy scramble
No LTB notice, no end-of-life clock ticking. That matters when you're qualifying a BOM for a five-year production run or stocking spares for a fielded system — you're not forced into a broker buy or a last-minute redesign.
Temperature grade and typical repair context
That covers office equipment, indoor appliances, and most industrial control cabinets that aren't sitting in direct sunlight or next to a furnace. If the board lives under the hood or in a freezer, this isn't the part — you'd be looking at the industrial or automotive-grade siblings in the same family.