What risks should I check before replacing SM04B-SRSS-TB(LF)(SN)?

The main risks are mechanical and electrical. Verify the substitute's mounting orientation (right-angle vs. vertical), footprint, and dimensions. Also, check that the current and voltage ratings meet or exceed the original's 1.0A/50V specification.

SM04B-SRSS-TB(LF)(SN) Alternatives, Datasheet & Cross Reference | JST

SM04B-SRSS-TB(LF)(SN) is a 4-pin, 1.0mm pitch, right-angle SMT header from JST. While no direct drop-in replacements have been verified, several functional alternatives exist that may require PCB layout changes.

AI replacement insight

Package riskhigh

Most candidates have different mounting orientations (vertical vs. right-angle) and will not fit the same PCB footprint.

Electrical riskmedium

Some candidates have lower current ratings. Always verify electrical specs meet or exceed the target's requirements.

Can it be replaced directly?

Direct replacement for SM04B-SRSS-TB(LF)(SN) should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

Investigate Megastar ZX-SH1.0-4PLT by reviewing its datasheet to confirm it is a right-angle SMT part. If so, compare footprints.

Main risk

The primary risk is package incompatibility; most alternatives have a different mounting orientation (vertical vs. right-angle), requiring a PCB redesign.

Recommended alternatives

Functional alternative with same pitch and ratings but different (vertical) mounting style, requiring board layout changes.

View details

Alternative comparison matrix

Feature / factor	SM04B-SRSS-TB(LF)(SN)	ZX-SH1.0-4PWT	BM04B-SRSS-TB(LF)(SN)	Compatibility / risk
Pitch	1.0mm	1.0mm	1.0mm	1.0mm — Pitch matches.; BM04B-SRSS-TB(LF)(SN): Pitch matches.
Pin Count	4	4	-	4 — Pin count matches.
Package	Right-Angle SMT	Vertical SMT	Vertical SMT	Vertical SMT — Different mounting orientation.; BM04B-SRSS-TB(LF)(SN): Different mounting orientation.
Current	1.0A	1.0A	0.7A	1.0A / 0.7A — Current rating matches.; BM04B-SRSS-TB(LF)(SN): Lower current rating.

Application & sourcing insights

Questions & answers

Verified drop-in options for SM04B-SRSS-TB(LF)(SN) 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.