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Best Alternatives to TLP291(BL-TP,SE

Package: SO4Toshiba Semiconductor and StorageLED Indication - DiscreteOptocoupler type: Phototransistor outputCollector-emitter voltage: 80 V minimumCollector current: 50 mA maximumCurrent transfer ratio: 50% minimum; Rank GB 100% minimumIsolation voltage: 3750 Vrms minimum

TLP291(BL-TP,SE) is a DC-input, transistor-output optocoupler from Toshiba in a 4-SOIC package, featuring 3750Vrms isolation. It is commonly used in switching power supplies and PLCs where reliable signal isolation is required.

AI replacement insight

Electrical riskmedium

CTR difference is the primary risk and requires engineering review.

Package risklow

Package and pinout are identical across the TLP291 family.

Can it be replaced directly?

Direct replacement for TLP291(BL-TP,SE should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

Use another TLP291 series variant, paying close attention to the CTR rank. TLP291(BLL-TP,SE) is a strong candidate.

Main risk

Current Transfer Ratio (CTR) mismatch may affect circuit performance.

Recommended alternatives

2
TLP291(BLL-TP,SE package
TLP291(BLL-TP,SE

Toshiba Semiconductor and Storage

Needs validationlow risk

Pin-compatible alternative from the same family with a higher Current Transfer Ratio (CTR).

View details

Alternative comparison matrix

Feature / factorTLP291(BL-TP,SETLP291(BLL-TP,SETLP291(GR-TP,SEAlt 3Compatibility / risk
Package4-SOIC4-SOIC4-SOIC4-SOIC — Package is physically identical.; TLP291(GR-TP,SE: Package is physically identical.
Pinout44-4 — Pinout is identical within the TLP291 family.
Ctr100% - 200% (BL Rank)200% - 400%50% - 600%200% - 400% / 50% - 600% — Candidate has higher CTR. May require input resistor adjustment.; TLP291(GR-TP,SE: Candidate has a much wider CTR range, including lower values.
Voltage80 V80 V80 V80 V — Collector-Emitter voltage matches.; TLP291(GR-TP,SE: Collector-Emitter voltage matches.
Temperature-55 to 110 °C-55 to 110 °C-55 to 110 °C-55 to 110 °C — Operating temperature range matches.; TLP291(GR-TP,SE: Operating temperature range matches.

Application & sourcing insights

Questions & answers

Verified drop-in options for TLP291(BL-TP,SE are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.