4N26W Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N26W is an optoisolator transistor with base output manufactured by onsemi, rated for 5300Vrms isolation voltage in a 6-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 4N26W provides galvanic isolation with a single transistor output channel, suitable for applications requiring DC input isolation with transistor-based switching output.

Substiute Parts

4N26W

onsemiIn Stock: 7874N26W Datasheet

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4N26-X006

Vishay Semiconductor Opto DivisionIn Stock: 10024N26-X006 Datasheet

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4N26G

Isocom Components 2004 LTDIn Stock: 7194N26G Datasheet

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4N26M

onsemiIn Stock: 509034N26M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 4N26W is determined by the following critical parameters:

• Package compatibility: 6-DIP form factor with identical pinout (0.400", 10.16mm)
• Isolation voltage: Minimum 5000Vrms to maintain equivalent isolation performance
• Output configuration: Transistor with base output for direct functional replacement
• Current transfer ratio: Minimum 20% @ 10mA for consistent switching characteristics
• Vce saturation: Maximum 500mV for equivalent on-state performance
• Operating temperature range: Support for -55°C to 100°C operation
• Input type: DC input compatibility

The substitute parts listed below meet these criteria within the allowed parameter tolerances for this optoisolator category.

Parameter Comparison

Engineering Selection Recommendations

4N26-X006 (Vishay Semiconductor Opto Division): This part is active and maintains the 6-DIP (0.400", 10.16mm) package footprint identical to the 4N26W. Isolation voltage is 5000Vrms, which is within acceptable tolerance of the 5300Vrms specification. ROHS3 compliance and unlimited MSL rating provide modern manufacturing standards. This is the primary substitute for direct replacement in existing designs.

4N26G (Isocom Components 2004 LTD): This part is active with identical package dimensions and pinout. However, the isolation voltage specification of 7.5Vpk differs significantly from the 5300Vrms rating of the 4N26W and may not provide equivalent isolation performance in high-voltage applications. ROHS3 compliance is available. Use only where isolation voltage requirements are less stringent than the original design specification.

4N26M (onsemi): This part is active and manufactured by the same supplier as the 4N26W. The 6-DIP package has different physical dimensions (0.300", 7.62mm versus 0.400", 10.16mm), requiring PCB layout modification. Isolation voltage is 4170Vrms, lower than the 4N26W specification. Operating temperature minimum is -40°C versus -55°C for the 4N26W. ROHS3 compliance is available. This part is suitable only where package size constraints override isolation voltage requirements and temperature range can be relaxed.

Frequently Asked Questions (FAQ)

Q: Can the 4N26-X006 be used as a direct replacement for the 4N26W?

A: Yes, the 4N26-X006 provides direct functional replacement. Both parts use the 6-DIP (0.400", 10.16mm) package with identical pinout, support the same current transfer ratio minimum of 20% @ 10mA, and maintain 500mV maximum Vce saturation. The isolation voltage difference (5000Vrms versus 5300Vrms) is within acceptable tolerance for most applications. No PCB modifications are required.

Q: What are the key differences between 4N26-X006 and 4N26G?

A: The primary difference is isolation voltage specification. The 4N26-X006 provides 5000Vrms isolation, while the 4N26G specifies 7.5Vpk isolation. Both maintain identical package dimensions and pinout. The 4N26G is suitable only for applications where isolation voltage requirements are significantly lower than the original 4N26W design specification.

Q: Why does the 4N26M have a different package dimension?

A: The 4N26M uses a 6-DIP (0.300", 7.62mm) package, which is physically smaller than the 4N26W 6-DIP (0.400", 10.16mm) package. This dimensional difference requires PCB layout modification and is not a direct footprint replacement. Use the 4N26M only when space constraints justify the design changes required.

Q: Is the 4N26M suitable for applications requiring -55°C operation?

A: No. The 4N26M operating temperature range is -40°C to 100°C, which does not support the -55°C minimum of the 4N26W. Applications requiring -55°C operation must use the 4N26-X006 or 4N26G, both of which support -55°C to 100°C operation.

Q: Are all substitute parts RoHS compliant?

A: The 4N26-X006, 4N26G, and 4N26M are all ROHS3 compliant. The original 4N26W RoHS status is not specified in the available documentation.