Is there a pin-compatible replacement for SMAJ26A?

No pin-compatible replacement is confirmed. SMAJ24A has the same package but a lower 24V standoff voltage, which is a downgrade and requires careful review of the circuit's maximum operating voltage.

What risks should I check before replacing SMAJ26A?

Key risks include: 1) Electrical: Using a part with a lower standoff voltage can cause unwanted conduction. 2) Package: Using an alternative in a different package requires a new board layout. 3) Polarity: Do not substitute a unidirectional part with a bidirectional one.

SMAJ26A Alternatives, Datasheet & Cross Reference | BOURNS

SMAJ26A is a 400W unidirectional TVS diode in a DO-214AC (SMA) package with a 26V standoff voltage. Finding a replacement requires matching the package, polarity, and ensuring an equal or higher standoff voltage.

AI replacement insight

Electrical riskhigh

Using a part with lower standoff voltage (e.g., SMAJ24A) can cause failure if operating voltage exceeds 24V.

Package riskmedium

Functional upgrades (e.g., SMBJ30A) are in a different package (SMB vs. SMA), requiring a board redesign.

Can it be replaced directly?

No direct pin-to-pin replacement has been identified. While parts like SMAJ24A share the same package, they have a lower standoff voltage (24V vs 26V), posing a risk in the original application. Functional alternatives exist but require board layout changes.

Best replacement path

For a functional upgrade, consider SMBJ30A or SMBJ33A, but they are in a larger SMB package requiring a layout change. For a similar package, SMAJ24A is an option but has a lower standoff voltage, which is a downgrade risk.

Main risk

The primary risk is substituting with a part that has a lower standoff voltage, which could lead to premature clamping or failure. Package mismatch is the second major risk, requiring PCB redesign.

Recommended alternatives

A form-fit alternative in an SMA package, but with a lower standoff voltage that poses a downgrade risk.

View details

Alternative comparison matrix

Feature / factor	SMAJ26A	SMAJ24A	SMBJ30A	SMBJ33A	Compatibility / risk
Package	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AA (SMB)	DO-214AA (SMB)	DO-214AC (SMA) / DO-214AA (SMB) — Package is form-factor compatible.; SMBJ30A: Different package requires PCB layout change.; SMBJ33A: Different package requires PCB layout change.
Polarity Or Type	Unidirectional	Unidirectional	Unidirectional	Unidirectional	Unidirectional — Polarity matches.; SMBJ30A: Polarity matches.; SMBJ33A: Polarity matches.
Voltage V	26.0V	24.0V	30.0V	33.0V	24.0V / 30.0V / 33.0V — Lower standoff voltage is a significant risk.; SMBJ30A: Higher standoff voltage provides more margin.; SMBJ33A: Higher standoff voltage provides more margin.
Power W	400.0W	400.0W	600.0W	600.0W	400.0W / 600.0W — Power rating is identical.; SMBJ30A: Higher power rating is a robust upgrade.; SMBJ33A: Higher power rating is a robust upgrade.
Current A	9.5A	10.3A	-	-	10.3A — Higher peak current capability.

Application & sourcing insights

Questions & answers

The best functional alternatives are SMBJ30A and SMBJ33A, offering higher power (600W) and voltage ratings (30V/33V), but they are in a larger SMB package and require a PCB layout change.