Dual-channel optocoupler with 5000 Vrms isolation
The onsemi HCPL2531TVM is a dual-channel optocoupler with a transistor output, rated for 5000 Vrms of galvanic isolation between input and output sides. This isolation rating suits it for breaking ground loops and providing safety isolation in industrial control interfaces, PLC digital inputs, and motor drive feedback paths where a clean signal barrier is required. Each of the two channels can sink up to 8 mA at a maximum output voltage of 20 V. The DC input side drives the internal LED at a forward voltage of 1.45 V typical, with a maximum forward current of 25 mA.
Switching speed and transfer ratio for logic-level interfaces
Typical turn-on and turn-off times are 250 ns and 260 ns respectively, which means this part can handle data rates in the low-MHz range — adequate for isolating slow serial buses, status signals, and PWM feedback at switching frequencies below 1 MHz. The current transfer ratio (CTR) is specified between 19% and 50% at a forward current of 16 mA, giving a predictable output drive for a given input current. Housed in an 8-DIP package with 0.400-inch (10.16 mm) body width, the HCPL2531TVM is a through-hole part that fits standard DIP sockets or can be soldered directly into a PCB.
Last Buy lifecycle — sourcing reality
onsemi has placed the HCPL2531TVM into Last Buy status. This means the manufacturer is no longer accepting volume orders for ongoing production; remaining inventory is finite and being consumed. For new designs, a functionally equivalent alternative should be evaluated.