Is there a pin-compatible replacement for SMAJ48A?

No direct pin-compatible replacement with identical or better specs was found. SMAJ54A is a potential form-fit replacement in the same DO-214AC package, but its lower peak current rating (4.59A vs 5.2A) requires engineering review.

What risks should I check before replacing SMAJ48A?

Key risks include package mismatch (SMA vs SMB/SMC), which requires a new PCB layout, and electrical parameter differences. Check standoff voltage, peak pulse current (Ipp), and clamping voltage (Vc) to ensure they meet your circuit's protection needs.

SMAJ48A Alternatives, Datasheet & Cross Reference | BOURNS

SMAJ48A is a 400W, 48V unidirectional TVS diode in a DO-214AC (SMA) package. Finding a direct replacement requires matching the package, polarity, and key electrical ratings like peak pulse current.

AI replacement insight

Package riskhigh

Most alternatives are in different packages (SMB/SMC) and require a board respin.

Electrical riskmedium

The only form-fit option has a lower current rating, which may compromise circuit protection.

Can it be replaced directly?

No direct, drop-in replacement with identical or better specifications was identified. SMAJ54A is physically compatible but has a lower current rating, posing a performance risk.

Best replacement path

For existing designs, cautiously evaluate SMAJ54A, verifying the lower current rating is acceptable. For new designs, consider electrically superior but physically larger parts like SMBJ58A.

Main risk

The primary risks are package incompatibility for most alternatives and a lower current rating for the one physically compatible option.

Recommended alternatives

A potential form-fit alternate in the same package, but with a lower current rating that requires engineering review.

View details

Alternative comparison matrix

Feature / factor	SMAJ48A	SMAJ54A	SMBJ58A	SMCJ48A	Compatibility / risk
Package	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AA (SMB)	DO-214AB (SMC)	DO-214AC (SMA) / DO-214AA (SMB) / DO-214AB (SMC) — Same package family ensures form-fit compatibility.; SMBJ58A: Different package, not a drop-in replacement.; SMCJ48A: Different package, not a drop-in replacement.
Polarity Or Type	Unidirectional	Unidirectional	Unidirectional	Unidirectional	Unidirectional — Polarity matches the target part.; SMBJ58A: Polarity matches.; SMCJ48A: Polarity matches.
Voltage V	48.0V	54.0V	58.0V	48.0V	54.0V / 58.0V / 48.0V — Higher standoff voltage is generally safe but may affect protection threshold.; SMBJ58A: Higher standoff voltage.; SMCJ48A: Standoff voltage matches.
Current A	5.2A	4.59A	6.5A	19.4A	4.59A / 6.5A / 19.4A — Lower peak pulse current rating is a downgrade risk.; SMBJ58A: Higher current rating.; SMCJ48A: Significantly higher current rating.
Power W	400.0W	400.0W	600.0W	1500.0W	400.0W / 600.0W / 1500.0W — Power rating is identical.; SMBJ58A: Higher power rating.; SMCJ48A: Significantly higher power rating.

Application & sourcing insights

Questions & answers

The best alternative depends on design flexibility. For existing boards, SMAJ54A is in the same package but has a lower current rating. For new designs, parts like SMBJ58A offer higher power and current ratings in a different package.