Is there a pin-compatible replacement for SMCJ28CA?

Yes, several parts like SMDJ30CA and SMCJ26CA use the same DO-214AB (SMC) package and are pin-compatible. However, their electrical parameters, especially standoff voltage, differ and require careful review.

What risks should I check before replacing SMCJ28CA?

The most critical parameter to check is the standoff voltage (Vrwm). Ensure the replacement's voltage is not too high (leaving the circuit unprotected) or too low (clipping the signal during normal operation). Also verify power and current ratings meet or exceed the original.

SMCJ28CA Alternatives, Datasheet & Cross Reference | Meritek

SMCJ28CA is a 1500W bidirectional TVS diode in a DO-214AB (SMC) package for 28V applications. When searching for alternatives, focus on matching the 28V standoff voltage, bidirectional polarity, and 1500W power rating.

AI replacement insight

Electrical riskmedium

Standoff voltage is the most critical parameter and requires careful matching to the application.

Package risklow

The DO-214AB (SMC) package is highly standardized, ensuring mechanical compatibility.

Firmware risklow

As a passive protection device, there is no firmware impact.

Can it be replaced directly?

No exact drop-in replacement was identified. SMDJ30CA is a strong candidate with superior power handling, but its 30V standoff voltage must be verified for the application.

Best replacement path

The best upgrade path is SMDJ30CA, which offers double the power rating (3000W) with a minor increase in standoff voltage to 30V. For a closer voltage match, SMCJ26CA offers 26V standoff but requires checking the circuit's operating voltage.

Main risk

The primary risk when substituting is mismatching the standoff voltage. A voltage that is too high (e.g., 33V) will not protect the circuit, while one that is too low (e.g., 26V) may interfere with normal operation.

Recommended alternatives

A powerful upgrade with 3000W power rating in the same package, but verify the slightly higher 30V standoff voltage is acceptable.

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Alternative comparison matrix

Feature / factor	SMCJ28CA	SMDJ30CA	SMCJ26CA	Compatibility / risk
Package	DO-214AB (SMC)	DO-214AB (SMC)	DO-214AB (SMC)	DO-214AB (SMC) — Identical package ensures form-fit compatibility.; SMCJ26CA: Identical package ensures form-fit compatibility.
Polarity Or Type	Bidirectional	Bidirectional	Bidirectional	Bidirectional — Polarity matches, ensuring correct circuit function.; SMCJ26CA: Polarity matches.
Power W	1500.0W	3000.0W	1500.0W	3000.0W / 1500.0W — Higher power rating provides increased robustness.; SMCJ26CA: Power rating matches.
Voltage V	28.0V	30.0V	26.0V	30.0V / 26.0V — Slightly higher standoff voltage requires engineering review.; SMCJ26CA: Lower standoff voltage may clamp during normal operation if line voltage is between 26V and 28V.
Current A	33.1A	62.0A	35.7A	62.0A / 35.7A — Higher peak current handling capability.; SMCJ26CA: Slightly higher peak current rating.

Application & sourcing insights

Questions & answers

SMDJ30CA is a strong alternative, offering a significant power upgrade to 3000W. However, its 30V standoff voltage should be reviewed to ensure it's compatible with your circuit's protection requirements.