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4N35S Optoisolator Equivalent & Substitute Parts
Part Overview
The 4N35S is a single-channel optoisolator transistor with base output manufactured by onsemi, rated for 5300Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 4N35S operates as a DC input optoisolator with transistor output configuration, suitable for applications requiring galvanic isolation in 6-SMD surface mount packages.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Part Number | 4N35S |
| Category | Optoisolators |
| Product Status | Obsolete |
| Number of Channels | 1 |
| Voltage - Isolation | 5300Vrms |
| Current Transfer Ratio (Min) | 100% @ 10mA |
| Output Type | Transistor with Base |
| Voltage - Output (Max) | 30V |
| Voltage - Forward (Vf) (Typ) | 1.18V |
| Current - DC Forward (If) (Max) | 100 mA |
| Vce Saturation (Max) | 300mV |
| Turn On / Turn Off Time (Typ) | 2µs, 2µs |
| Operating Temperature | -55°C ~ 100°C |
| Mounting Type | Surface Mount |
| Package / Case | 6-SMD, Gull Wing |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitution of the 4N35S optoisolator is determined by the following critical parameters:
- Isolation Voltage Rating: Minimum 5300Vrms or equivalent
- Output Configuration: Transistor with Base output
- Number of Channels: Single channel (1)
- Input Type: DC input
- Package Type: 6-SMD, Gull Wing surface mount
- Current Transfer Ratio: Minimum 100% @ 10mA
- Output Voltage Rating: Maximum 30V
- Operating Temperature Range: Support for -55°C ~ 100°C or compatible subset
- Vce Saturation: Maximum 300mV or lower
Substitute parts are grouped into two categories:
Direct Substitutes maintain all critical electrical parameters and are pin-compatible replacements.
Similar Substitutes provide equivalent functionality with variations in isolation voltage, switching speed, or current ratings that remain within acceptable operating margins for the 4N35S application space.
Parameter Comparison
| Parameter | 4N35S (Main) | 4N35SM | 4N35-300E | 4N35-500E | 4N35-X007 | 4N35-X007T | 4N35-X009 | 4N35-X009T | 4N35S-TA |
|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | onsemi | Broadcom Limited | Broadcom Limited | Vishay Semiconductor Opto Division | Vishay Semiconductor Opto Division | Vishay Semiconductor Opto Division | Vishay Semiconductor Opto Division | Lite-On Inc. |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active |
| Voltage - Isolation | 5300Vrms | 4170Vrms | 3550Vrms | 3550Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 3550Vrms |
| Current Transfer Ratio (Min) | 100% @ 10mA | 100% @ 10mA | 100% @ 10mA | 100% @ 10mA | 100% @ 10mA | 100% @ 10mA | 100% @ 10mA | 100% @ 10mA | 100% @ 10mA |
| Output Type | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base | Transistor with Base |
| Voltage - Output (Max) | 30V | 30V | 30V | 30V | 30V | 30V | 30V | 30V | 30V |
| Voltage - Forward (Vf) (Typ) | 1.18V | 1.18V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V |
| Current - DC Forward (If) (Max) | 100 mA | 60 mA | 60 mA | 60 mA | 60 mA | 60 mA | 60 mA | 60 mA | 60 mA |
| Current - Output / Channel | Not specified | Not specified | 100mA | 100mA | 50mA | 50mA | 50mA | 50mA | 100mA |
| Vce Saturation (Max) | 300mV | 300mV | 300mV | 300mV | Not specified | Not specified | Not specified | Not specified | 300mV |
| Turn On / Turn Off Time (Typ) | 2µs, 2µs | 2µs, 2µs | Not specified | Not specified | 10µs, 10µs | 10µs, 10µs | 10µs, 10µs | 10µs, 10µs | Not specified |
| Rise / Fall Time (Typ) | Not specified | Not specified | 3µs, 3µs | 3µs, 3µs | Not specified | Not specified | Not specified | Not specified | 3µs, 3µs |
| Operating Temperature | -55°C ~ 100°C | -40°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C |
| Package / Case | 6-SMD, Gull Wing | 6-SMD, Gull Wing | 6-SMD, Gull Wing | 6-SMD, Gull Wing | 6-SMD, Gull Wing | 6-SMD, Gull Wing | 6-SMD, Gull Wing | 6-SMD, Gull Wing | 6-SMD, Gull Wing |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
4N35SM (onsemi) is the primary active substitute from the original manufacturer. It maintains onsemi product lineage with ROHS3 compliance. The isolation voltage is reduced to 4170Vrms and forward current maximum is 60 mA compared to the 4N35S specification of 100 mA. Operating temperature range is -40°C to 100°C, narrower than the 4N35S range of -55°C to 100°C. Selection is appropriate for applications not requiring the full -55°C lower temperature limit or 5300Vrms isolation margin.
4N35-X007 and 4N35-X007T (Vishay Semiconductor Opto Division) provide 5000Vrms isolation, closely matching the 4N35S isolation voltage specification. Both are ROHS3 compliant and support the full -55°C to 100°C operating temperature range. Turn-on and turn-off times are 10µs compared to 2µs for the 4N35S. Output current per channel is 60 mA maximum. The 4N35-X007T variant is supplied in Tape & Reel packaging; 4N35-X007 is supplied in Tube packaging.
4N35-X009 and 4N35-X009T (Vishay Semiconductor Opto Division) offer identical electrical specifications to the 4N35-X007 series with 5000Vrms isolation and full temperature range support. Packaging differs: 4N35-X009 in Tube format and 4N35-X009T in Tape & Reel format.
4N35-300E and 4N35-500E (Broadcom Limited) provide 3550Vrms isolation with ROHS3 compliance and full -55°C to 100°C temperature support. These are suitable for applications with lower isolation voltage requirements. Rise and fall times are specified at 3µs. Output current per channel is 100 mA. The 4N35-500E is supplied in Cut Tape & Digi-Reel packaging; 4N35-300E is supplied in Tube packaging.
4N35S-TA (Lite-On Inc.) operates at 3550Vrms isolation with ROHS3 compliance and full -55°C to 100°C temperature range. Output current per channel is 100 mA. Supplied in Tape & Reel packaging. Rise and fall times are 3µs.
Frequently Asked Questions (FAQ)
Q: Can 4N35SM directly replace 4N35S in all applications?
A: 4N35SM is electrically compatible for most applications but has reduced isolation voltage (4170Vrms vs. 5300Vrms) and narrower operating temperature range (-40°C to 100°C vs. -55°C to 100°C). Applications requiring the full 5300Vrms isolation margin or -55°C operation require alternative substitutes.
Q: What is the primary difference between Vishay 4N35-X007 and 4N35-X009 variants?
A: Both Vishay variants (4N35-X007 and 4N35-X009) provide identical electrical specifications with 5000Vrms isolation and full temperature range support. The difference is packaging: 4N35-X007 is available in Tube; 4N35-X009 is available in Tube. The "-T" suffix variants (4N35-X007T and 4N35-X009T) indicate Tape & Reel packaging.
Q: Are Broadcom 4N35-300E and 4N35-500E suitable substitutes for high-isolation applications?
A: Broadcom 4N35-300E and 4N35-500E are rated for 3550Vrms isolation, which is lower than the 4N35S specification of 5300Vrms. These parts are suitable only for applications where 3550Vrms isolation is sufficient. For applications requiring 5300Vrms or near-equivalent isolation, Vishay 4N35-X007 or 4N35-X009 series are recommended.
Q: What packaging options are available for 4N35S substitutes?
A: Substitute parts are available in Tube, Tape & Reel (TR), and Cut Tape & Digi-Reel packaging formats. All maintain the 6-SMD, Gull Wing surface mount configuration. Selection depends on procurement and assembly requirements.
Q: Does the 4N35S-TA from Lite-On provide equivalent isolation voltage?
A: 4N35S-TA provides 3550Vrms isolation, lower than the 4N35S specification of 5300Vrms. It is suitable for applications with reduced isolation voltage requirements but not as a direct high-isolation replacement.
Q: Are all substitute parts ROHS3 compliant?
A: All active substitute parts listed are ROHS3 compliant. The original 4N35S does not specify RoHS status. All parts maintain REACH Unaffected status.
Q: What is the impact of switching speed differences between 4N35S and Vishay substitutes?
A: The 4N35S specifies 2µs turn-on and turn-off times. Vishay 4N35-X007, 4N35-X009, and variants specify 10µs switching times. Applications with timing-critical requirements must account for this 5x increase in switching delay.
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