Is there a pin-compatible replacement for SMAJ58A?

Yes, SMAJ58A is an industry-standard part. Versions from manufacturers like Bourns, Littelfuse, and Vishay are considered pin-compatible replacements, sharing the same SMA (DO-214AC) package and key electrical ratings.

What risks should I check before replacing SMAJ58A?

When replacing SMAJ58A, verify the package is SMA (DO-214AC). Alternatives like SMBJ58A use a larger SMB package and are not drop-in. Also, confirm the standoff voltage (58V), power rating (400W or higher), and that it is unidirectional.

SMAJ58A Alternatives, Datasheet & Cross Reference | Microdiode Semiconductor (Shenzhen) Co., Ltd.

SMAJ58A is a popular 400W, 58V unidirectional TVS diode in a compact SMA package, widely used for overvoltage protection. Several manufacturers offer pin-compatible alternatives, and higher-power functional alternatives exist for more demanding applications.

AI replacement insight

Package riskmedium

Similar part numbers (e.g., SMBJ series) exist in different packages that are not compatible.

Electrical risklow

Key parameters are standard, but always verify the full datasheet.

Sourcing risklow

This is a widely multi-sourced component, reducing supply chain risk.

Can it be replaced directly?

Yes, SMAJ58A from other manufacturers like Bourns or Littelfuse is a direct replacement.

Best replacement path

Use a cross-vendor SMAJ58A for a direct drop-in replacement.

Main risk

The main risk is accidentally selecting a part with a different package (e.g., SMB instead of SMA) or an incorrect standoff voltage.

Recommended alternatives

A pin-compatible replacement from a different manufacturer with identical key electrical ratings and package.

View details

Alternative comparison matrix

Feature / factor	SMAJ58A	SMAJ58A	SMBJ58A-13-F	Compatibility / risk
Package	DO-214AC, SMA	DO-214AC (SMA)	SMB	DO-214AC (SMA) / SMB — Package matches, enabling drop-in replacement.; SMBJ58A-13-F: Candidate is in a larger SMB (DO-214AA) package.
Voltage	58.0V	58.0V	58.0V	58.0V — Reverse standoff voltage matches.; SMBJ58A-13-F: Reverse standoff voltage matches.
Power	400.0W	400.0W	600.0W	400.0W / 600.0W — Peak pulse power rating matches.; SMBJ58A-13-F: Higher power rating provides more protection.
Polarity Or Type	Unidirectional	Unidirectional	Unidirectional	Unidirectional — Polarity matches.; SMBJ58A-13-F: Polarity matches.

Application & sourcing insights

Questions & answers

The best alternative is typically another SMAJ58A from a major manufacturer like Bourns, Littelfuse, or Vishay, as they offer the same performance and package. For an upgrade, the SMBJ58A offers higher power (600W) but requires a larger PCB footprint.