Is there a pin-compatible replacement for 1SMA4734A?

Yes, a 1SMA4734A from another manufacturer is a pin-compatible replacement. Parts from the same family, like 1SMA4735A, share the same package but have different voltages and are not pin-compatible substitutes.

What risks should I check before replacing 1SMA4734A?

The main risk is substituting with a part that has a different Zener voltage. Also, check the datasheet for Zener impedance (Zzt) and reverse leakage (Ir), as minor variations can affect performance in sensitive circuits.

1SMA4734A Alternatives, Datasheet & Cross Reference | Microdiode Semiconductor (Shenzhen) Co., Ltd.

The 1SMA4734A is a standard 5.6V, 1W Zener diode in a surface-mount SMA package, widely used for voltage regulation. While direct cross-vendor replacements are the best option, parametric alternatives with different voltages exist but require careful review.

AI replacement insight

Electrical riskhigh

Using a part with a different Zener voltage will fail in most applications without a redesign.

Package risklow

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

Sourcing risklow

1SMA4734A is a widely available part from multiple vendors, making sourcing generally easy.

Can it be replaced directly?

Yes, other manufacturers produce 1SMA4734A diodes that are intended as direct, pin-compatible replacements.

Best replacement path

Source a 1SMA4734A from another reputable manufacturer. These are industry-standard parts designed to be interchangeable.

Main risk

Using a part with a different Zener voltage (e.g., 1SMA4735A at 6.2V) will alter the circuit's voltage regulation point and is not a drop-in replacement.

Recommended alternatives

Similar part with a slightly higher 6.2V Zener voltage and better impedance.

View details

Alternative comparison matrix

Feature / factor	1SMA4734A	1SMA4735A	1SMA4736A	Compatibility / risk
Package	SMA	SMA	SMA (DO-214AC)	SMA / SMA (DO-214AC) — Package is form-factor compatible.; 1SMA4736A: Package is form-factor compatible.
Voltage	5.6V	6.2V	6.8V	6.2V / 6.8V — Zener voltage is ~11% higher.; 1SMA4736A: Zener voltage is ~21% higher.
Power	1.0W	1.0W	1.0W	1.0W — Power rating is identical.; 1SMA4736A: Power rating is identical.
Impedance	5Ω	2Ω	-	2Ω — Lower impedance provides better regulation.
Current	10µA @ 2V	-	10uA @ 4V	10uA @ 4V — Reverse leakage is comparable.

Application & sourcing insights

Questions & answers

The best alternative is a 1SMA4734A from a different qualified manufacturer. These parts are designed to be cross-compatible with matching voltage, power, and package specifications.