Is there a pin-compatible replacement for HMHA2801A?

No drop-in replacement is confirmed without datasheet verification. LTV-217-TP1-B-G is a likely candidate due to its SOP-4 half-pitch package, but the footprint must be compared manually.

What risks should I check before replacing HMHA2801A?

Key risks include package footprint mismatch (mini-flat vs. SOP), differences in Current Transfer Ratio (CTR) affecting circuit gain, and lower voltage ratings like VCEO.

HMHA2801A Alternatives, Datasheet & Cross Reference | onsemi

HMHA2801A is a half-pitch mini-flat phototransistor optocoupler from onsemi. Finding a direct replacement requires careful review of package dimensions and Current Transfer Ratio (CTR).

AI replacement insight

Package riskmedium

Target is a 'mini-flat' package; alternatives in SOP-4 may have different dimensions.

Electrical riskmedium

CTR and VCEO differences in candidates require circuit analysis and stress testing.

Can it be replaced directly?

No confirmed direct replacement exists. LTV-217-TP1-B-G is the most promising candidate for form-fit-function but requires engineering validation.

Best replacement path

Start with LTV-217-TP1-B-G, verifying its package footprint and testing the impact of its higher CTR. If CTR must match, consider FOD817A3SD but verify the lower 70V VCEO is acceptable.

Main risk

The primary risks are physical package mismatch and electrical differences in Current Transfer Ratio (CTR), which can alter circuit behavior.

Recommended alternatives

Strong functional alternative with matching voltage ratings and a likely compatible half-pitch package.

View details

Alternative comparison matrix

Feature / factor	HMHA2801A	LTV-217-TP1-B-G	FOD817A3SD	LTV-816S-TA1-D	Compatibility / risk
Package	4-Pin Mini-Flat	SOP-4 (Half-pitch)	4-SMD, Gull Wing	4-pin SOP	SOP-4 (Half-pitch) / 4-SMD, Gull Wing / 4-pin SOP — Likely compatible, but requires footprint verification.; FOD817A3SD: Standard SOP-4 package may differ from target's mini-flat footprint.; LTV-816S-TA1-D: Likely similar to mini-flat, but requires footprint verification.
Voltage	80 V	80 V	70 V	80 V	80 V / 70 V — Collector-Emitter Voltage (VCEO) matches.; FOD817A3SD: VCEO is lower than target's 80V.; LTV-816S-TA1-D: VCEO matches.
Current	80-160%	130-260%	80-160%	300-600%	130-260% / 80-160% / 300-600% — CTR range is higher and wider; requires circuit validation.; FOD817A3SD: CTR range matches target.; LTV-816S-TA1-D: CTR is significantly higher, may cause instability in feedback loops.

Application & sourcing insights

Questions & answers

LTV-217-TP1-B-G is a strong functional alternative with matching isolation voltage, VCEO, and a similar half-pitch package, but its CTR (130-260%) differs and requires review.