Is there a pin-compatible replacement for SMBJ48A?

SMBJ54A is pin-compatible as it uses the same SMB (DO-214AA) package. However, its electrical protection characteristics are weaker and must be reviewed for your application.

What risks should I check before replacing SMBJ48A?

Verify the maximum clamping voltage (Vc) is low enough to protect your circuit, the peak pulse current (Ipp) meets your transient requirements, and the package footprint matches your PCB layout.

SMBJ48A Alternatives, Datasheet & Cross Reference | FTR Qiaoguang

SMBJ48A is a 600W, 48V unidirectional TVS diode in a standard SMB package. Finding a substitute requires matching the package and ensuring key protection parameters like clamping voltage and peak current are met or exceeded.

AI replacement insight

Electrical riskmedium

Candidates have different clamping voltages and current ratings that must be verified.

Package riskhigh

One strong electrical candidate has a non-matching package, requiring a board spin.

Sourcing risklow

The SMBJ/SMCJ series is widely available from multiple vendors.

Can it be replaced directly?

There is no verified direct, pin-for-pin replacement for the SMBJ48A in our catalog. Candidates exist with tradeoffs in electrical protection or package size.

Best replacement path

No direct drop-in replacement was found. SMBJ54A is in the same package but offers weaker protection. SMCJ60A is electrically superior but requires a PCB layout change.

Main risk

The main risks are using a part with a higher clamping voltage, which could damage the protected circuit, or a different package requiring a board redesign.

Recommended alternatives

A functional alternative with higher power and voltage ratings, but in a non-compatible SMC package.

View details

Alternative comparison matrix

Feature / factor	SMBJ48A	SMBJ54A	SMCJ60A	Compatibility / risk
Package	DO-214AA (SMB)	SMB (DO-214AA)	SMC (DO-214AB)	SMB (DO-214AA) / SMC (DO-214AB) — Footprint compatible.; SMCJ60A: Not footprint compatible, requires PCB change.
Voltage	77.4V	87.1V	60V	87.1V / 60V — Higher clamping voltage offers less protection.; SMCJ60A: Higher standoff voltage offers more margin.
Current	7.8A	6.9A	15.5A	6.9A / 15.5A — Lower peak current handling is a downgrade.; SMCJ60A: Higher peak current handling.
Power	600W	600W	1500W	600W / 1500W — Power rating is identical.; SMCJ60A: Higher power rating provides better surge survivability.

Application & sourcing insights

Questions & answers

SMBJ54A is a potential alternative in the same package if your design can tolerate a higher clamping voltage and lower peak current. For new designs, SMCJ60A is electrically superior but requires a larger SMC footprint.