Alternatives to onsemi 4N26S
onsemi 4N26S and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 4N26Sonsemi | 4N26SMonsemi |  4N26-X009TVishay Semiconductor Opto Division | +2more | |
|---|---|---|---|---|
| FFF Compatibility | Identical standard 6-pin optocoupler pinout with SMD Lead Bend Gull-Wing footprint.Matches standard 6-SMD Gull Wing physical package size and mounting footprint.Slightly lower isolation rating (4170 Vrms vs 5300 Vrms) and lower maximum input forward current (60 mA vs 100 mA). Operating temperature is slightly narrower (-40°C to 100°C vs -55°C to 100°C). | Verified identical 6-pin optocoupler pinout assignment and SMD gull-wing footprint.Matches standard 6-SMD package and PCB layout requirements.Maximum forward current is lower than the original (60 mA vs 100 mA). | ||
 AI Summary | 4N26S by onsemi: Optoisolator Transistor with Base Output 5300Vrms 1 Channel 6-SMD. | The 4N26SM is onsemi's official direct active migration path for the obsolete 4N26S. It features the exact same package configuration and pinout, though the isolation rating is reduced to 4170 Vrms. Use orderable suffix 4N26SR2M for high-volume tape-and-reel requirements.
| The Vishay 4N26-X009T is a high-quality alternative that maintains a robust 5000 Vrms isolation rating close to the original 5300 Vrms. It is pin-compatible and package-compatible, making it an excellent drop-in replacement with enhanced 70V collector-emitter voltage.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | Discontinued | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | Optoisolator Transistor with Base Output 5300Vrms 1 Channel 6-SMD | Optoisolator Transistor with Base Output 4170Vrms 1 Channel 6-SMD | Optoisolator Transistor with Base Output 5000Vrms 1 Channel 6-SMD | |
| Manufacturer | onsemi | onsemi | Vishay Semiconductor Opto Division | |
| Type | Optocouplers, Optoisolators | Optocouplers, Optoisolators | Optocouplers, Optoisolators | |
| Datasheet | Open | Open | Open | |
| Lead Time | Unknown | 18 weeks | 17 weeks | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8541.49.8000 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| Input Type | DC | - | - | |
| Output Type | Transistor with Base | - | - | |
| Mounting Type | Surface Mount | - | - | |
| Package / Case | 6-SMD, Gull Wing | - | - | |
| Number of Channels | 1 | - | - | |
| Voltage - Isolation | 5300Vrms | - | - | |
| Vce Saturation (Max) | 500mV | - | - | |
| Operating Temperature | -55°C ~ 100°C | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
| 4N27onsemi | In stock | Obsolete | 6Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi 4N26S 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 4N26S are the 4N26SM (onsemi) and the 4N26-X009T (Vishay Semiconductor Opto Division), out of 4 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 4N26S 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 4N26S (onsemi) is a part in the Optocouplers, Optoisolators category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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