Is there a pin-compatible replacement for 1SMA4732A?

Yes, parts like 1SMA4733A are pin-compatible as they use the same 2-pin SMA package. However, pin compatibility does not guarantee functional equivalence. The slight difference in Zener voltage means it is a form-fit match that requires electrical review.

What risks should I check before replacing 1SMA4732A?

The main risk is the Zener voltage (Vz). Ensure the replacement's Vz and its tolerance range are acceptable for your circuit's regulation or clamping needs. Secondary checks include Zener impedance (Zzt) and reverse leakage current (Ir) for sensitive applications.

1SMA4732A Alternatives, Datasheet & Cross Reference | GOODWORK

Finding a substitute for the 1SMA4732A, a 4.7V 1W Zener diode, requires careful matching of its key electrical parameters and SMA package. While no exact cross is available, several functional alternatives exist.

AI replacement insight

Electrical riskmedium

Zener voltage is the most critical parameter and it differs across all candidates. Circuit tolerance must be verified.

Package risklow

All viable candidates use the same industry-standard SMA (DO-214AC) package, ensuring physical compatibility.

Can it be replaced directly?

No exact drop-in replacement is available. The 1SMA4733A is a close functional alternative but has a slightly higher Zener voltage (5.1V vs 4.7V) that requires verification.

Best replacement path

1SMA4733A is the strongest candidate, offering a very close parametric match in the same package.

Main risk

The primary risk is the difference in Zener voltage, which can alter the performance of voltage regulation or clamping circuits.

Recommended alternatives

A 5.1V, 1W Zener diode in a compatible SMA package, a strong functional alternative.

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Alternative comparison matrix

Feature / factor	1SMA4732A	1SMA4733A	1SMA4734A	Compatibility / risk
Package	SMA	DO-214AC (SMA)	SMA	DO-214AC (SMA) — Package is form and fit compatible.; 1SMA4734A: Package is form and fit compatible.
Voltage	4.7V	5.1V	5.6V	5.1V / 5.6V — Slightly higher Zener voltage, check circuit tolerance.; 1SMA4734A: Significantly higher Zener voltage, not a drop-in replacement.
Power	1.0W	1.0W	1.0W	1.0W — Power dissipation matches.; 1SMA4734A: Power dissipation matches.
Zener Impedance	8Ω	7Ω	-	7Ω — Zener impedance is comparable.
Reverse Leakage	10µA @ 1V	10µA @ 1V	-	10µA @ 1V — Reverse leakage current matches.

Application & sourcing insights

Questions & answers

The 1SMA4733A is the best alternative. It shares the same 1W power rating and SMA package, with a Zener voltage of 5.1V, which is the closest available to the target's 4.7V. Always verify your circuit's tolerance for this small difference.