Is there a pin-compatible replacement for SMAJ30CA?

No, a fully pin-compatible, drop-in replacement with equivalent or better specifications was not identified. SMAJ33CA shares the same package but has a lower current rating, which requires careful engineering review before use.

What risks should I check before replacing SMAJ30CA?

Before replacing SMAJ30CA, you must check two main things: 1) Package footprint compatibility, as many alternatives like SMBJ30CA are in different packages. 2) Peak pulse current rating, as the same-package option SMAJ33CA is rated lower (7.5A vs 8.3A).

SMAJ30CA Alternatives, Datasheet & Cross Reference | Microdiode Semiconductor (Shenzhen) Co., Ltd.

The MDD SMAJ30CA is a 400W, 30V bidirectional TVS diode in an SMA package. While no direct drop-in replacement has been confirmed, several functional alternatives and one parametrically similar option are available for consideration.

AI replacement insight

Package riskhigh

Most alternatives are in different packages (SMB, SMC) and require a PCB layout change.

Electrical riskmedium

The same-package alternative (SMAJ33CA) has a lower peak pulse current rating, posing a risk of failure in over-current events.

Can it be replaced directly?

No direct, drop-in replacement with identical or better specifications was found. The closest form-factor match, SMAJ33CA, has a lower current rating and requires engineering validation.

Best replacement path

For a new board layout, SMBJ30CA offers an identical voltage with higher power/current ratings. For existing boards, SMAJ33CA is in the same package but has a lower current rating that must be verified.

Main risk

The primary risk is either mechanical incompatibility due to different packages (SMB/SMC) or electrical under-specification from a lower current rating (SMAJ33CA).

Recommended alternatives

Same package and power, but a lower current rating requires careful review of circuit protection needs.

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Alternative comparison matrix

Feature / factor	SMAJ30CA	SMAJ33CA	SMBJ30CA	SMCJ36CA	Compatibility / risk
Package	DO-214AC, SMA	DO-214AC, SMA	DO-214AA (SMB)	DO-214AB (SMC)	DO-214AC, SMA / DO-214AA (SMB) / DO-214AB (SMC) — Package is form-factor compatible.; SMBJ30CA: Different package requires PCB layout change.; SMCJ36CA: Larger package requires PCB layout change.
Voltage	30.0V	33.0V	30.0V	36.0V	33.0V / 30.0V / 36.0V — Higher standoff voltage is generally acceptable.; SMBJ30CA: Identical standoff voltage.; SMCJ36CA: Higher standoff voltage may be acceptable.
Current	8.3A	7.5A	12.4A	25.9A	7.5A / 12.4A / 25.9A — Lower peak pulse current is a downgrade and requires review.; SMBJ30CA: Higher peak pulse current provides more robust protection.; SMCJ36CA: Significantly higher current rating.
Power	400.0W	400.0W	600.0W	1500.0W	400.0W / 600.0W / 1500.0W — Peak power rating is identical.; SMBJ30CA: Higher power rating offers better protection.; SMCJ36CA: Significantly higher power rating.

Application & sourcing insights

Questions & answers

The best alternative depends on your design constraints. If you can change the PCB layout, SMBJ30CA is an excellent electrical upgrade. If you cannot, SMAJ33CA is in the same package but has a lower current rating that must be carefully evaluated.