4N27SVM Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N27SVM is a single-channel optoisolator transistor with base output manufactured by onsemi, rated for 4170Vrms isolation voltage. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The 4N27SVM provides galvanic isolation in applications requiring DC input switching with transistor output configuration in a 6-SMD surface mount package.

Substiute Parts

4N27SVM

onsemiIn Stock: 10754N27SVM Datasheet

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4N27SMT&R

Isocom Components 2004 LTDIn Stock: 7894N27SMT&R Datasheet

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4N27XSM

Isocom Components 2004 LTDIn Stock: 7714N27XSM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4N27SVM is determined by the following critical parameters:

• Single-channel configuration: All substitutes must provide exactly 1 channel
• Output topology: Transistor with base output is required
• Isolation voltage: Minimum 4170Vrms isolation capability
• DC input type: Input must support DC switching
• Maximum output voltage: 30V rating
• Surface mount package: 6-SMD, Gull Wing form factor
• Current transfer ratio: Minimum 10% @ 10mA
• Vce saturation: Maximum 500mV
• Forward current: Maximum 60 mA DC forward current capability

The identified substitute parts meet these core electrical and mechanical requirements while maintaining compatibility with the original design specifications.

Parameter Comparison

Engineering Selection Recommendations

4N27SMT&R (Isocom Components 2004 LTD)

This substitute is active in production status. The isolation voltage specification of 7.5Vpk does not meet the 4170Vrms isolation requirement of the original 4N27SVM. This part is not suitable for direct substitution in applications requiring the specified isolation voltage rating.

4N27XSM (Isocom Components 2004 LTD)

This substitute is active in production status with ROHS3 compliance certification. The isolation voltage rating of 5300Vrms exceeds the 4170Vrms requirement of the 4N27SVM. All other electrical parameters—current transfer ratio, output voltage, forward current, and saturation voltage—align with the original specification. The operating temperature range extends to -55°C, providing broader environmental coverage than the original -40°C minimum. The 6-SMD, Gull Wing package maintains mechanical compatibility. This part satisfies the substitution criteria for applications requiring the specified isolation voltage performance.

Frequently Asked Questions (FAQ)

Q: Can 4N27SMT&R replace 4N27SVM in all applications?

A: No. The 4N27SMT&R specifies 7.5Vpk isolation voltage, which is significantly lower than the 4170Vrms isolation requirement of the 4N27SVM. Substitution is not appropriate for designs requiring the original isolation voltage specification.

Q: Is 4N27XSM a direct replacement for 4N27SVM?

A: 4N27XSM meets the core substitution criteria. The isolation voltage of 5300Vrms exceeds the 4170Vrms requirement. All other electrical parameters—current transfer ratio, output configuration, voltage ratings, and saturation characteristics—are compatible. The package and mounting type are identical. Substitution is valid from an electrical and mechanical standpoint.

Q: What is the significance of the isolation voltage difference between 4N27SVM and 4N27XSM?

A: The 4N27XSM provides higher isolation voltage (5300Vrms vs. 4170Vrms). In applications where the original 4170Vrms isolation is specified, the higher rating of 4N27XSM provides additional safety margin and is acceptable. The higher isolation voltage does not degrade performance in circuits designed for the lower specification.

Q: Are there packaging differences between these parts?

A: All three parts use identical 6-SMD, Gull Wing surface mount packages. No PCB layout modifications are required for substitution of 4N27XSM for 4N27SVM.

Q: What compliance certifications apply to the substitute parts?

A: 4N27XSM carries ROHS3 compliance certification and maintains REACH Unaffected status, matching the regulatory profile of the original 4N27SVM. Both parts have MSL rating of 1 (Unlimited) and identical ECCN and HTSUS classifications.

Q: Does the operating temperature range affect substitution suitability?

A: 4N27XSM specifies -55°C to 100°C operating range, compared to -40°C to 100°C for 4N27SVM. The extended lower temperature limit of 4N27XSM does not restrict its use in applications designed for the original temperature range and may provide additional environmental flexibility.