Is there a pin-compatible replacement for 1SMA5921A?

Yes, parts like 1SMA4736A use the same SMA package and are pin-compatible. However, you must verify key electrical parameters like power dissipation, as they may differ.

What risks should I check before replacing 1SMA5921A?

The main risks are electrical. Check the Zener voltage (must be 6.8V), power rating (must be >= 1.5W), and reverse leakage current. Using a part with a lower power rating can lead to overheating and failure.

1SMA5921A Alternatives, Datasheet & Cross Reference | Luguang Electronic Technology Co., Ltd.

Finding a substitute for the 1SMA5921A Zener diode requires careful matching of its 6.8V Zener voltage and 1.5W power rating in an SMA package. Alternatives may have different power or voltage specifications.

AI replacement insight

Electrical riskhigh

Substitutes may have lower power ratings or different Zener voltages.

Package risklow

The SMA (DO-214AC) package is common and standardized.

Can it be replaced directly?

No direct, drop-in replacement was found without caveats. The closest options have a lower power rating, which introduces risk.

Best replacement path

Find a Zener diode with Vz=6.8V, Pd>=1.5W in an SMA package. 1SMA4736A is functionally close but requires power derating analysis.

Main risk

The primary risk is using a substitute with a lower power rating (e.g., 1.0W vs 1.5W), which could cause the component to fail under load.

Recommended alternatives

Functionally similar with a 6.8V Zener voltage but has a lower power rating of 1.0W.

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Alternative comparison matrix

Feature / factor	1SMA5921A	1SMA4736A	1SMA4737A	Compatibility / risk
Package	SMA (DO-214AC)	SMA (DO-214AC)	SMA (DO-214AC)	SMA (DO-214AC) — Package matches, ensuring form and fit.; 1SMA4737A: Package matches, ensuring form and fit.
Voltage	6.8V	6.8V	7.5V	6.8V / 7.5V — Zener voltage matches the target's primary function.; 1SMA4737A: Zener voltage is ~10% higher.
Power	1.5W	1.0W	1.0W	1.0W — Lower power rating requires application review.; 1SMA4737A: Lower power rating requires application review.
Pinout	2	2	-	2 — Standard 2-pin diode in SMA package.

Application & sourcing insights

Questions & answers

The 1SMA4736A offers the same 6.8V Zener voltage and package but has a lower 1.0W power rating. This is a potential downgrade and requires verifying your circuit's power dissipation.