Needs validationmedium risk
Same series SMT part with a top-entry orientation instead of side-entry; requires layout review.
Best Alternatives to S3B-PH-SM4-TB(LF)(SN)
S3B-PH-SM4-TB(LF)(SN) is a 3-pin, 2.0mm pitch side-entry SMT header from JST's PH series. Finding a direct drop-in replacement requires careful verification of the PCB footprint and mechanical orientation.
AI replacement insight
Package riskhigh
Most alternatives have different mounting (THT) or orientation (top-entry), requiring PCB changes.
Electrical risklow
Most candidates match or exceed the 2A/100V electrical ratings.
Can it be replaced directly?
Direct replacement for S3B-PH-SM4-TB(LF)(SN) should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
The closest alternative is B3B-PH-SM4-TB(LF)(SN), which has the same SMT package but a top-entry orientation instead of side-entry. This requires verifying mechanical clearance.
Main risk
The main risk is mechanical incompatibility. A top-entry connector cannot replace a side-entry one without layout and clearance checks, and an SMT part cannot be replaced by a THT part without a new PCB design.
Recommended alternatives
2Alternative comparison matrix
| Feature / factor | S3B-PH-SM4-TB(LF)(SN) | B3B-PH-SM4-TB(LF)(SN) | S3B-PH-K-S(LF)(SN) | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | Surface Mount (SMT) | Surface Mount (SMT) | Through Hole | Surface Mount (SMT) / Through Hole — Mounting type matches.; S3B-PH-K-S(LF)(SN): Requires different PCB design and assembly process. | |
| Orientation | Side Entry | Top-entry | Side-entry | Top-entry / Side-entry — Orientation differs, affects cable exit and layout.; S3B-PH-K-S(LF)(SN): Orientation matches. | |
| Pitch | 2.0 mm | 2.0 mm | 2.0 mm | 2.0 mm — matched; S3B-PH-K-S(LF)(SN): matched | |
| Electricals | 2 A / 100 V | 2 A / 100 V | 2 A / 100 V | 2 A / 100 V — matched; S3B-PH-K-S(LF)(SN): matched | |
| Family | JST PH Series | JST PH Series | - | JST PH Series — Same connector family increases mate compatibility. |
Application & sourcing insights
Questions & answers
Verified drop-in options for S3B-PH-SM4-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.