Is there a pin-compatible replacement for KH-4.5X4.5X4.3H-STM?

Several switches share the 4.5x4.5mm 4-pin SMT footprint, but are not guaranteed to be pin-compatible without datasheet verification. Candidates like TD-1150SR-4.5H-250 appear to have a compatible footprint but must be checked against your PCB layout. Actuator height is the most common variable.

What risks should I check before replacing KH-4.5X4.5X4.3H-STM?

Key risks include: 1) Actuator height mismatch, which can cause mechanical interference. 2) Operating force differences, which change the button's feel. 3) Minor variations in the SMT pad layout, requiring a PCB footprint check.

KH-4.5X4.5X4.3H-STM Alternatives, Datasheet & Cross Reference | Guangdong Hongzhi Electronics Technology Co., Ltd.

KH-4.5X4.5X4.3H-STM is a popular 4.3mm high SMT tactile switch. Finding a replacement requires matching the 4.5x4.5mm footprint and SMT mounting, while carefully verifying actuator height and operating force for mechanical and functional compatibility.

AI replacement insight

Package riskhigh

Actuator height is a critical dimension for tactile switches and varies between candidates.

Electrical risklow

Voltage and current ratings are standard for this switch type and generally match.

Can it be replaced directly?

No confirmed direct drop-in replacement has been identified. All candidates require engineering verification of actuator height, operating force, and PCB footprint.

Best replacement path

Find a tactile switch with a 4.5x4.5mm SMT footprint and a height as close to 4.3mm as possible. The TD-1150SR-4.5H-250 is a strong starting point for evaluation.

Main risk

The primary risk is mechanical incompatibility due to differences in actuator height, which can cause interference or prevent proper function.

Recommended alternatives

A form-fit alternate with a very similar height and matching electrical ratings, but operating force may differ.

View details

Alternative comparison matrix

Feature / factor	KH-4.5X4.5X4.3H-STM	TD-1150SR-4.5H-250	KH-4.5X4.5X5.5H-STM	Compatibility / risk
Package	4.5mm x 4.5mm, SMT	4.5mm x 4.5mm, SMT	4.5mm x 4.5mm, SMT	4.5mm x 4.5mm, SMT — Package footprint matches.; KH-4.5X4.5X5.5H-STM: Same manufacturer series, footprint matches.
Height	4.3mm	4.5mm	5.5mm	4.5mm / 5.5mm — Slightly taller (+0.2mm), verify clearance.; KH-4.5X4.5X5.5H-STM: Significantly taller (+1.2mm), verify clearance.
Operating Force	Not specified, likely 160/250gf	250gf	160gf	250gf / 160gf — May differ from target, affecting user feel.; KH-4.5X4.5X5.5H-STM: Likely matches one variant of the target.
Voltage Current	12V / 50mA	12V / 50mA	12V / 50mA	12V / 50mA — Standard rating, matches target family.; KH-4.5X4.5X5.5H-STM: Standard rating, matches target family.
Pin Count	4	4	-	4 — Pin count matches, but footprint requires verification.

Application & sourcing insights

Questions & answers

The best alternative depends on your design's flexibility. TD-1150SR-4.5H-250 is very close in height (4.5mm) but may have a different operating force. Other parts in the Kinghelm KH-4.5X4.5X*H-STM series offer different heights and may be suitable if your board has clearance.