TLP291(BL-TP,SE
Toshiba Semiconductor and Storage
Needs validationlow risk
A strong alternative from the same TLP291 family with a compatible but different CTR range.
Best Alternatives to TLP291(GR-TP,SE
The Toshiba TLP291(GR-TP,SE is a popular DC-input phototransistor optocoupler in a compact 4-SOIC package. Several pin-compatible alternatives exist within the same TLP291 family, offering flexibility in sourcing with the primary consideration being the Current Transfer Ratio (CTR) range.
AI replacement insight
Electrical risklow
Key voltage and current ratings match. CTR difference requires verification but is often acceptable.
Package risklow
All recommended alternatives use the same 4-SOIC package and are from the same product family, implying an identical pinout.
Sourcing risklow
Multiple compatible options exist within the same family, improving sourcing flexibility.
Can it be replaced directly?
Direct replacement for TLP291(GR-TP,SE should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
The best replacement path is to select another part from the Toshiba TLP291 series, such as TLP291(GRL-TP,SE) or TLP291(BL-TP,SE). These share the same package, pinout, and key electrical ratings.
Main risk
The primary risk is a mismatch in the Current Transfer Ratio (CTR). The target part has a wide CTR range (GR rank: 50-600%), while alternatives may have tighter ranges (e.g., GRL rank: 100-300%).
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | TLP291(GR-TP,SE | TLP291(BL-TP,SE | TLP291(BLL-TP,SE | TLP291(GRH-TP,SE | Compatibility / risk |
|---|---|---|---|---|---|
| Package | 4-SOIC | 4-SOIC | 4-SOIC | 4-SOIC | 4-SOIC — Same package family.; TLP291(BLL-TP,SE: Same package family.; TLP291(GRH-TP,SE: Same package family.; TLP291(GRL-TP,SE: Same package family. |
| Pinout | 4-pin | Assumed identical | Assumed identical | Assumed identical | Assumed identical — Same product family (TLP291). Verification recommended.; TLP291(BLL-TP,SE: Same product family (TLP291). Verification recommended.; TLP291(GRH-TP,SE: Same product family (TLP291). Verification recommended.; TLP291(GRL-TP,SE: Same product family (TLP291). Verification recommended. |
| Input Type | DC | DC | - | - | DC — Both are DC input optocouplers.; TLP291(GRL-TP,SE: Both are DC input optocouplers. |
| Ctr | 50-600% (GR) | 200-400% (BL) | 200-400% (BLL) | 150-300% (GRH) | 200-400% (BL) / 200-400% (BLL) / 150-300% (GRH) / 100-300% (GRL) — Tighter CTR bin, within target's wider range.; TLP291(BLL-TP,SE: Tighter CTR bin, within target's wider range.; TLP291(GRH-TP,SE: Tighter CTR bin, within target's wider range.; TLP291(GRL-TP,SE: Tighter CTR bin, within target's wider range. |
| Temperature | -55°C to 110°C | -55°C to 110°C | - | - | -55°C to 110°C — Identical operating temperature range.; TLP291(GRL-TP,SE: Identical operating temperature range. |
Application & sourcing insights
Questions & answers
Verified drop-in options for TLP291(GR-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.