Is there a pin-compatible replacement for SMBJ20CA?

SMBJ18CA shares the same DO-214AA (SMB) package and is considered pin-compatible. However, it has a lower reverse standoff voltage of 18V, which is a critical parametric difference that requires engineering review.

What risks should I check before replacing SMBJ20CA?

When replacing SMBJ20CA, the main risks are electrical and mechanical. Check the reverse standoff voltage (Vr) to ensure it meets or exceeds the original 20V. Also, verify the package; alternatives like SMCJ26CA are in a different (SMC) package and are not drop-in replacements.

SMBJ20CA Alternatives, Datasheet & Cross Reference | BOURNS

SMBJ20CA is a 600W bidirectional TVS diode in a DO-214AA (SMB) package. Key alternatives exist, but require careful review of voltage ratings or package compatibility.

AI replacement insight

Electrical riskmedium

A key candidate has a lower voltage rating, which may not provide adequate protection.

Package riskhigh

A key functional upgrade has a different package, requiring a PCB redesign.

Firmware risklow

Not applicable for this passive component type.

Can it be replaced directly?

No direct, 1-to-1 replacement has been identified. SMBJ18CA is a pin-compatible downgrade, while SMCJ26CA is a functional upgrade in a different package.

Best replacement path

Upgrade to a higher voltage part in the same SMB package if available, or consider the functional upgrade SMCJ26CA if a PCB redesign is feasible.

Main risk

The primary risk is either accepting a lower voltage rating (SMBJ18CA) or requiring a PCB layout change for a different package (SMCJ26CA).

Recommended alternatives

A form-fit alternate with the same power rating but a lower standoff voltage.

View details

Alternative comparison matrix

Feature / factor	SMBJ20CA	SMBJ18CA	SMCJ26CA	Compatibility / risk
Package	DO-214AA (SMB)	DO-214AA (SMB)	DO-214AB (SMC)	DO-214AA (SMB) / DO-214AB (SMC) — Same package and pinout.; SMCJ26CA: Different package, requires PCB layout change.
Polarity Or Type	Bidirectional	Bidirectional	Bidirectional	Bidirectional — Polarity matches.; SMCJ26CA: Polarity matches.
Voltage V	20.0V	18.0V	26.0V	18.0V / 26.0V — Lower reverse standoff voltage.; SMCJ26CA: Higher reverse standoff voltage.
Power W	600.0W	600.0W	1500.0W	600.0W / 1500.0W — Same power rating.; SMCJ26CA: Significantly higher power rating.
Current A	18.52A	20.6A	-	20.6A — Higher peak pulse current.

Application & sourcing insights

Questions & answers

SMCJ26CA offers superior voltage and power ratings but requires a PCB layout change due to its different package (SMC). For a form-fit replacement, SMBJ18CA is an option, but it has a lower voltage rating (18V vs 20V) and must be carefully evaluated.