What this photocoupler does on the board
The Toshiba TLP2358(TPR,E) is a single-channel DC-input photocoupler with a push-pull, totem-pole output stage.
3750Vrms isolation and 20kV/µs CMTI — where it earns its keep
The 3750Vrms isolation rating is the safety barrier for industrial and motor-drive applications where you need to separate the high-voltage DC bus or inverter phase from the control logic. The 20kV/µs common-mode transient immunity means it won't glitch when the IGBT or SiC MOSFET switches at tens of kilovolts per microsecond — a common failure mode in cheaper optocouplers that sends false pulses into the gate driver or MCU. Propagation delay is 250ns max symmetrical (tpLH and tpHL both 250ns), which keeps the switching dead-time predictable. Rise and fall times are 15ns and 12ns typical, fast enough for 1 MHz PWM signals in most motor-control and power-supply feedback loops.
The output side runs on 3V to 20V, so it directly interfaces with 3.3V MCUs, 5V logic, or 12V/15V gate-drive rails without a level shifter. The DC input side needs a forward voltage of 1.55V typical and a maximum forward current of 20mA — standard for driving from a GPIO pin through a series resistor.
Housed in a 6-SOIC package with 5 leads (one pin omitted), 4.55mm body width. Surface-mount only.
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