Is there a pin-compatible replacement for SMAJ20CA?

Yes, parts like SMAJ18CA and SMAJ22CA use the same DO-214AC (SMA) package and are pin-compatible. However, their electrical parameters differ, so they are not direct drop-in replacements.

What risks should I check before replacing SMAJ20CA?

Key risks include: 1) Standoff Voltage: A lower voltage may cause false triggering, a higher one reduces protection. 2) Peak Current: A lower rating may not handle expected surges. 3) Polarity: Ensure the replacement is also bidirectional.

SMAJ20CA Alternatives, Datasheet & Cross Reference | Microdiode Semiconductor (Shenzhen) Co., Ltd.

Finding a substitute for the SMAJ20CA TVS diode involves matching its bidirectional polarity, 20V standoff voltage, and 400W power rating in a DO-214AC (SMA) package. Alternatives may have different voltage or current ratings requiring careful review.

AI replacement insight

Electrical riskhigh

Standoff voltage and peak current differences require careful engineering review.

Package risklow

Alternatives in the same SMA package are available.

Can it be replaced directly?

No direct drop-in replacement was found. Alternatives require verifying standoff voltage and peak current against your application's needs.

Best replacement path

Parametric alternatives like SMAJ18CA or SMAJ22CA exist but require trade-offs in voltage and current ratings.

Main risk

The primary risk is mismatch in standoff voltage, which can either lead to nuisance tripping or inadequate circuit protection.

Recommended alternatives

A bidirectional TVS in the same package with higher current rating but lower standoff voltage (18V vs 20V).

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Alternative comparison matrix

Feature / factor	SMAJ20CA	SMAJ18CA	SMAJ22CA	Compatibility / risk
Package	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA) — Same package and pin count.; SMAJ22CA: Same package and pin count.
Polarity Or Type	Bidirectional	Bidirectional	Bidirectional	Bidirectional — Polarity matches.; SMAJ22CA: Polarity matches.
Voltage V	20.0V	18.0V	22.0V	18.0V / 22.0V — Lower standoff voltage may cause premature clamping.; SMAJ22CA: Higher standoff voltage reduces protection margin.
Current A	12.3A	13.7A	11.3A	13.7A / 11.3A — Higher peak pulse current rating.; SMAJ22CA: Lower peak pulse current rating.
Power W	400.0W	400.0W	400.0W	400.0W — Power rating matches.; SMAJ22CA: Power rating matches.

Application & sourcing insights

Questions & answers

There is no single best alternative. SMAJ18CA offers higher current but a lower 18V standoff voltage, while SMAJ22CA has a higher 22V standoff voltage but lower current. Both require careful engineering review.