Skip to main content
Log in
Toshiba Semiconductor TLP291(GRH,SE — Optoisolators

TLP291(GRH,SE Toshiba Optocoupler 3750Vrms 4-SOIC Active

MPNTLP291(GRH,SE
End of Life

Toshiba TLP291(GRH,SE, 1-channel DC-input transistor-output optocoupler, 3750Vrms isolation, 150-300% CTR at 5 mA, -55°C to 110°C, 4-SOIC surface-mount package, tube.

$0.59Ref. price · indicative, final on quote
Toshiba Semiconductor TLP291(GRH,SE datasheet (PDF)
Packaging4-SOIC (0.179", 4.55mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

TLP291(GRH,SE specifications
ParameterValue
Input typeDC
Output typeTransistor
MountingSurface Mount
Voltage - isolation3750Vrms
Voltage - output80V
Voltage - forward (Vf)1.25V
Current - output (Channel)50mA
Current transfer ratio300% @ 5mA
Current - DC forward (If)50 mA
Operating temperature-55°C ~ 110°C
PackageTube
Case4-SOIC (0.179\", 4.55mm Width)
Channels1
Vce saturation300mV
Rise (Fall time)2µs, 3µs
Turn on (Turn off time)3µs, 3µs

Product details

What this optocoupler does in your circuit

The TLP291(GRH,SE is a single-channel transistor-output optocoupler from Toshiba, designed for DC input and rated for 3750Vrms isolation between input and output. It delivers a current transfer ratio between 150% and 300% at a forward current of 5 mA. The output transistor is rated for 80 V maximum and 50 mA continuous current.

Rise and fall times are 2 µs and 3 µs typical, with turn-on and turn-off both at 3 µs.

Package and mounting for the assembly line

Housed in a 4-SOIC package with 0.179-inch (4.55 mm) body width. The supplier device package is 4-SO. Check the MSL rating before reflow — Toshiba optocouplers in this family typically carry MSL 1, but verify the reel date code to avoid popcorning.

Frequently asked questions

Is TLP291(GRH,SE a direct replacement for TLP291?

The TLP291(GRH,SE is a specific CTR-binned variant of the TLP291 family. The 'GRH' suffix indicates a CTR range of 150% to 300% at 5 mA. If your BOM calls for a standard TLP291 with a different CTR bin, verify the CTR requirements before substituting. The package and pinout are identical.