Alternatives to onsemi 1N4371A
onsemi 1N4371A and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 1N4371Aonsemi |  1N5223Bonsemi | 1N5223BTaiwan Semiconductor Corporation | +3more | |
|---|---|---|---|---|
| FFF Compatibility | Uses the identical DO-35 axial package with anode and cathode layout.Has matching physical dimensions and axial mounting configuration.Perfect electrical parameter alignment (Vz = 2.7V, Pd = 500mW, Zzt = 30 Ohms). | Uses the identical standard DO-35 axial package footprint.Matches exact physical dimensions and through-hole axial mounting style.Matches all critical electrical thresholds including nominal 2.7 V Zener voltage. | ||
 AI Summary | 1N4371A by onsemi: Zener Diode 2.7 V 500 mW ±5% Through Hole DO-35. | The 1N5223B from onsemi is a direct, active drop-in replacement for the obsolete 1N4371A. It retains identical electrical specifications and physical dimensions, ensuring seamless system integration.
| The Taiwan Semiconductor 1N5223B serves as a second-source direct replacement, offering identical 2.7 V, 500 mW specifications in a DO-35 axial package to mitigate supply risk.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | Discontinued | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | Zener Diode 2.7 V 500 mW ±5% Through Hole DO-35 | Zener Diode 2.7 V 500 mW ±5% Through Hole DO-35 | Zener Diode 2.7 V 500 mW ±5% Through Hole DO-35 | |
| Manufacturer | onsemi | onsemi | Taiwan Semiconductor Corporation | |
| Type | Diodes | Diodes | Diodes | |
| Datasheet | Open | Open | Open | |
| Lead Time | Unknown | 18 weeks | 18 weeks | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8541.10.0050 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| Tolerance | ±5% | - | - | |
| Power - Max | 500 mW | - | - | |
| Mounting Type | Through Hole | - | - | |
| Package / Case | DO-204AH, DO-35, Axial | - | - | |
| Impedance (Max) (Zzt) | 30 Ohms | - | - | |
| Operating Temperature | -65°C ~ 200°C | - | - | |
| Supplier Device Package | DO-35 | - | - | |
| Voltage - Zener (Nom) (Vz) | 2.7 V | - | - |
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Frequently asked questions
Yes. The onsemi 1N4371A is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.
The closest qualified second sources for the onsemi 1N4371A are the 1N5223B (onsemi) and the 1N5223B (Taiwan Semiconductor Corporation), out of 5 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Not always. The alternatives to the 1N4371A are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The 1N4371A (onsemi) is a part in the Diodes category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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