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Best Alternatives to TLP291(GRL-TP,SE

Package: 4-SOICToshiba Semiconductor and StoragePhotovoltaic OutputIsolation Voltage: 3750 VrmsCollector-Emitter Voltage: 80 VCurrent Transfer Ratio (CTR): 50% - 600%Operating Temperature: -55°C to 110°CNumber of Channels: 1

The TLP291(GRL-TP,SE is a standard DC-input optocoupler in a compact SO-4 package. Finding a substitute involves matching the package, pinout, and Current Transfer Ratio (CTR).

AI replacement insight

Electrical riskmedium

CTR differences between bins can affect circuit gain and require validation.

Package riskhigh

Alternatives outside the SO-4 package require a complete board redesign.

Can it be replaced directly?

TLP291(GR-TP,SE) is a strong candidate, but its CTR range (100-300%) is narrower than the target's (100-400%). This may be acceptable for many designs but requires review.

Best replacement path

Use another TLP291 series part with a compatible CTR bin, such as TLP291(GR-TP,SE).

Main risk

Current Transfer Ratio (CTR) mismatch.

Recommended alternatives

4
TLP291(GR-TP,SE package
TLP291(GR-TP,SE

Toshiba Semiconductor and Storage

Needs validationlow risk

Pin-compatible alternative from the same family with a slightly narrower CTR range; requires engineering review.

View details

Alternative comparison matrix

Feature / factorTLP291(GRL-TP,SETLP291(GR-TP,SETLP291(BL-TP,SETLP383(GR-TPL,ECompatibility / risk
Package4-SOIC4-SOIC4-SOIC4-pin SO6L4-SOIC / 4-pin SO6L / DIP-4 — Same package and pin count.; TLP291(BL-TP,SE: Same package and pin count.; TLP383(GR-TPL,E: Package is SO6L vs SOIC-4. Footprints are different.; TLP785GB-S(UMW): Package is through-hole (DIP) vs surface-mount (SOIC). Not a drop-in.
Current Transfer Ratio (Ctr)100% to 400% (GRL)100% to 300%200% to 600%100% - 300%100% to 300% / 200% to 600% / 100% - 300% / 100% - 600% — Candidate has a narrower max CTR. Review circuit gain requirements.; TLP291(BL-TP,SE: Candidate has a higher minimum and max CTR. May affect circuit stability.; TLP383(GR-TPL,E: CTR range is compatible with target's GRL bin.; TLP785GB-S(UMW): CTR range is compatible.
Input TypeDCDCDC-DC — Both are DC input type.; TLP291(BL-TP,SE: Both are DC input type.
Voltage3750 Vrms3750 Vrms-5000 Vrms3750 Vrms / 5000 Vrms — Isolation voltage matches.; TLP383(GR-TPL,E: Higher isolation voltage is an upgrade.; TLP785GB-S(UMW): Higher isolation voltage is an upgrade.
LifecycleActiveActiveActive-Active — Both parts are active.; TLP291(BL-TP,SE: Both parts are active.

Application & sourcing insights

Questions & answers

The best alternatives are other variants from the Toshiba TLP291 series, such as TLP291(GR-TP,SE) or TLP291(BL-TP,SE), which share the same package but have different CTR ratings that must be verified for your application.