Is there a pin-compatible replacement for SMAJ22CA?

Yes, parts like SMAJ20CA and P4SMA30CA are in the same SMA package and are pin-compatible. However, their electrical parameters, especially standoff voltage, differ and must be reviewed.

What risks should I check before replacing SMAJ22CA?

The primary risk is the standoff voltage (Vrwm). Ensure the replacement's Vrwm is above your circuit's maximum operating voltage but low enough to provide adequate protection. Also verify power and peak current ratings.

SMAJ22CA Alternatives, Datasheet & Cross Reference | BOURNS

Finding a substitute for the SMAJ22CA TVS diode requires matching its 22V bidirectional protection in a DO-214AC (SMA) package. Key alternatives involve tradeoffs in standoff voltage that need careful review.

AI replacement insight

Electrical riskhigh

Standoff voltage mismatch is the primary risk.

Package risklow

SMA (DO-214AC) is a common package with many options.

Can it be replaced directly?

No direct, drop-in replacement has been confirmed. Alternatives like SMAJ20CA and P4SMA30CA have different standoff voltages and require engineering validation.

Best replacement path

Find a bidirectional TVS in an SMA package with a 22V standoff voltage. If unavailable, SMAJ20CA is a closer but riskier option than P4SMA30CA.

Main risk

The main risk is selecting a part with an incorrect standoff voltage, leading to either insufficient protection (voltage too high) or nuisance clamping (voltage too low).

Recommended alternatives

A potential alternative in the same SMA package, but with a lower 20V standoff voltage that poses a risk.

View details

Alternative comparison matrix

Feature / factor	SMAJ22CA	SMAJ20CA	P4SMA30CA	Compatibility / risk
Package	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA) — Same package and pin count.; P4SMA30CA: Same package and pin count.
Polarity	Bidirectional	Bidirectional	Bidirectional	Bidirectional — Polarity matches target.; P4SMA30CA: Polarity matches target.
Voltage	22.0V	20.0V	30.0V	20.0V / 30.0V — Standoff voltage is lower; may clamp during normal operation.; P4SMA30CA: Standoff voltage is much higher; may not protect the circuit adequately.
Current	11.3A	12.3A	Not specified	12.3A / Not specified — Higher peak pulse current rating provides more robustness.; P4SMA30CA: Peak pulse current rating is missing from available data.
Power	400.0W	400.0W	400.0W	400.0W — Power rating is identical.; P4SMA30CA: Power rating is identical.

Application & sourcing insights

Questions & answers

SMAJ20CA is a close parametric match, but its lower 20V standoff voltage must be verified against your circuit's operating voltage to prevent unwanted clamping.