Is there a pin-compatible replacement for SMAJ5.0A?

Yes, the SMAJ5.0A is a standard part number offered by multiple manufacturers like Littelfuse, Vishay, and STMicroelectronics. These are typically pin-to-pin compatible, but always verify the datasheet for specific electrical tolerances.

What risks should I check before replacing SMAJ5.0A?

When replacing an SMAJ5.0A, verify the breakdown voltage range, clamping voltage, and peak pulse current ratings in the specific manufacturer's datasheet. If using a part with a different package like an SMBJ5.0A, you must modify the PCB layout.

SMAJ5.0A Alternatives, Datasheet & Cross Reference | AVX

The SMAJ5.0A is a popular 400W, 5.0V unidirectional TVS diode in a DO-214AC (SMA) package, used for transient voltage protection. Multiple manufacturers offer pin-compatible versions, making sourcing flexible.

AI replacement insight

Electrical risklow

Low when using the same part number from a different vendor.

Package riskhigh

High if accidentally selecting a part from the SMBJ series, which requires a board change.

Sourcing risklow

Low due to the high number of manufacturers for this standard part.

Can it be replaced directly?

Yes, an SMAJ5.0A from other manufacturers is typically a direct, pin-compatible replacement.

Best replacement path

Use a cross-vendor SMAJ5.0A from a major manufacturer like Littelfuse or Vishay.

Main risk

The primary risk is minor parametric variation between manufacturers; a secondary risk is using a functional alternate with the wrong package.

Recommended alternatives

A pin-compatible alternative from various manufacturers with the same package and key electrical ratings.

View details

Alternative comparison matrix

Feature / factor	SMAJ5.0A	SMAJ5.0A	SMBJ5.0A	Compatibility / risk
Package	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AA (SMB)	DO-214AC (SMA) / DO-214AA (SMB) — Package matches.; SMBJ5.0A: Different package requires PCB redesign.
Voltage	5.0V	5.0V	5.0V	5.0V — Reverse standoff voltage matches.; SMBJ5.0A: Reverse standoff voltage matches.
Polarity Or Type	Unidirectional	Unidirectional	Unidirectional	Unidirectional — Polarity matches.; SMBJ5.0A: Polarity matches.
Power	400W	400W	600W	400W / 600W — Peak pulse power matches.; SMBJ5.0A: Higher power rating is an upgrade.
Current	43.5A	43.5A	65.3A	43.5A / 65.3A — Peak pulse current matches.; SMBJ5.0A: Higher current rating is an upgrade.

Application & sourcing insights

Questions & answers

The best alternative is another manufacturer's SMAJ5.0A, such as from Littelfuse, Vishay, or STMicroelectronics, as they are designed to be pin-compatible. For a power upgrade, consider the SMBJ5.0A, but note it requires a different PCB footprint.