Gate-driver optocoupler with 3 A peak and 5 kV isolation
The FOD3182 is an onsemi single-channel optocoupled gate driver delivering 3 A peak output current with 5000 Vrms isolation in an 8-DIP through-hole package. The 35 kV/µs minimum common-mode transient immunity keeps the output state stable during fast switching edges on the high-voltage side — a common failure point in motor-drive and inverter designs where the IGBT collector swings hundreds of volts in tens of nanoseconds. Rise and fall times are 38 ns and 24 ns typical, with a maximum propagation delay of 210 ns and pulse-width distortion held to 65 ns. The output supply range is 10 V to 30 V, covering standard gate-drive rails for IGBTs and power MOSFETs. Forward voltage is 1.43 V typical with a maximum DC forward current of 25 mA.
What the key ratings mean for your gate-drive design
The 3 A peak output is the current available to charge the IGBT or MOSFET gate capacitance during turn-on. For a typical 50 nC gate charge, the rise time into the gate is roughly 17 ns — fast enough for switching frequencies up to 100 kHz in hard-switched topologies. The 2.5 A high/low sourcing and sinking capability is symmetrical, so turn-off is equally fast, reducing dead-time requirements. 5000 Vrms isolation meets reinforced insulation requirements per UL for mains-connected industrial drives and power supplies. The 35 kV/µs minimum CMTI ensures the output does not glitch when the IGBT collector voltage slews rapidly — a spec that matters more than isolation voltage in noisy switching environments. The 8-DIP package is a through-hole footprint — expect a 0.100-inch pitch, 0.300-inch body width, compatible with standard DIP sockets or soldered directly into plated through-holes on a single-sided or double-sided PCB.