4N26SVM Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N26SVM is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications. This component features a single channel with 4170Vrms isolation rating and transistor output configuration in a 6-SMD surface mount package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	4N26SVM
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	4170Vrms
Current Transfer Ratio (Min)	20% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Vce Saturation (Max)	500mV
Operating Temperature	-40°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 4N26SVM is determined by the following critical parameters:

Output Configuration: Transistor with base output (required for pin-compatible replacement)
Package Type: 6-SMD, Gull Wing surface mount (required for PCB compatibility)
Number of Channels: Single channel (required for functional equivalence)
Isolation Voltage: Minimum 4170Vrms (required for electrical safety compliance)
Current Transfer Ratio: Minimum 20% @ 10mA (required for signal integrity)
Maximum Output Voltage: 30V (required for circuit compatibility)
Vce Saturation: Maximum 500mV (required for switching performance)

The identified substitute parts maintain these critical parameters while offering active product status and improved compliance certifications.

Parameter Comparison

Parameter	4N26SVM (Main)	4N26SMT&R	4N26XSM
Manufacturer	onsemi	Isocom Components 2004 LTD	Isocom Components 2004 LTD
Product Status	Obsolete	Active	Active
Number of Channels	1	1	1
Voltage - Isolation	4170Vrms	7.5Vpk	5300Vrms
Current Transfer Ratio (Min)	20% @ 10mA	20% @ 10mA	20% @ 10mA
Output Type	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	30V	30V	30V
Current - Output / Channel	-	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.18V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	60mA	60mA
Vce Saturation (Max)	500mV	500mV	500mV
Operating Temperature	-40°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

4N26SMT&R: This substitute maintains identical current transfer ratio, output voltage, and saturation characteristics. However, the isolation voltage specification of 7.5Vpk is substantially lower than the 4170Vrms requirement of the main part. This part is suitable only for applications where isolation voltage requirements are significantly reduced. The part is active and ROHS3 compliant, with extended operating temperature range (-55°C to 100°C).

4N26XSM: This substitute provides superior isolation voltage at 5300Vrms, exceeding the 4170Vrms specification of the main part. All critical electrical parameters match or exceed the original specification: current transfer ratio, output voltage, saturation voltage, and forward current ratings are identical. The part is active, ROHS3 compliant, and offers extended operating temperature range (-55°C to 100°C). This part represents the most direct functional replacement for the obsolete 4N26SVM.

Frequently Asked Questions (FAQ)

Q: Can 4N26SMT&R be used as a direct replacement for 4N26SVM?

A: 4N26SMT&R is not recommended as a direct replacement due to isolation voltage mismatch. The 7.5Vpk isolation rating is insufficient for applications requiring 4170Vrms isolation. Pin configuration and package are compatible, but electrical performance in high-voltage isolation circuits will be compromised.

Q: Is 4N26XSM a pin-compatible substitute?

A: Yes. 4N26XSM maintains the 6-SMD, Gull Wing package configuration and transistor with base output topology. All critical electrical parameters are compatible or superior to the original specification.

Q: What is the difference between isolation voltage specifications (Vrms vs Vpk)?

A: Vrms (root mean square) and Vpk (peak voltage) represent different measurement standards for isolation voltage. The 4N26SVM specifies 4170Vrms, while 4N26SMT&R specifies 7.5Vpk. These are not directly comparable values, and the 4N26SMT&R specification represents significantly lower isolation capability.

Q: Are there compliance differences between the main part and substitutes?

A: The main part (4N26SVM) lists no RoHS status. Both substitute parts are ROHS3 compliant. All three parts are REACH Unaffected and carry identical MSL ratings of 1 (Unlimited). Moisture sensitivity is not a differentiating factor.

Q: What is the operating temperature range difference?

A: The main part operates from -40°C to 100°C. Both substitute parts extend the lower temperature limit to -55°C, providing broader environmental compatibility. The upper temperature limit remains 100°C across all three parts.

Q: Can packaging format affect substitution decisions?

A: The main part is supplied in standard packaging. 4N26SMT&R is supplied in Tape & Reel format, while 4N26XSM is supplied in Tube format. Both packaging formats are standard for surface mount components and do not affect electrical compatibility, though they may impact procurement and handling procedures.

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