4N37M-V Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N37M-V is an optoisolator transistor with base output manufactured by Everlight Electronics Co Ltd. This component provides galvanic isolation up to 5000Vrms with a single channel configuration in a 6-DIP package. The device is designed for DC input applications requiring transistor output with base access, operating across an industrial temperature range of -55°C to 110°C. The product maintains Active status and is RoHS3 compliant.

Substitute parts are identified when equivalent electrical and mechanical parameters allow direct replacement in circuit applications, maintaining isolation voltage, output type, package form factor, and thermal operating range compatibility.

Substiute Parts

4N37M-V

Everlight Electronics Co LtdIn Stock: 9484N37M-V Datasheet

Current PartRFQ

4N37TVM

Fairchild SemiconductorIn Stock: 24324N37TVM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4N37M-V is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Output Type: Transistor with Base (functional equivalence required)
• Package / Case: 6-DIP form factor (mechanical compatibility)
• Mounting Type: Through Hole (board assembly compatibility)
• Number of Channels: 1 (circuit topology match)
• Input Type: DC (signal interface compatibility)

Allowable Parameter Variance:

• Voltage - Isolation: Substitute must meet or exceed 4170Vrms minimum
• Current Transfer Ratio (Min): 100% @ 10mA or equivalent
• Voltage - Forward (Vf): Range 1.18V to 1.2V acceptable
• Current - DC Forward (If) (Max): 60 mA standard
• Vce Saturation (Max): 300mV standard
• Operating Temperature: Substitute range must encompass application requirements within -55°C to 110°C envelope
• Turn On / Turn Off Time: Substitute performance of 2µs to 10µs acceptable for most applications

The 4N37TVM from Fairchild Semiconductor qualifies as a substitute based on matching output type, package configuration, mounting method, and channel count. Isolation voltage differential and operating temperature range variance require application-level verification.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (4N37M-V): The 4N37M-V remains the preferred component when application requirements demand 5000Vrms isolation voltage, 80V maximum output voltage, or extended operating temperature range to -55°C. Active product status and RoHS3 compliance support long-term supply chain stability and regulatory conformance.

Substitute Selection (4N37TVM): The 4N37TVM from Fairchild Semiconductor is electrically compatible when application isolation requirements are satisfied at 4170Vrms, output voltage does not exceed 30V, and operating temperature remains within -40°C to 100°C. The substitute offers faster switching performance (2µs versus 10µs turn-on time). Both components maintain Active product status. Verify RoHS compliance status against specific procurement requirements.

Selection Criteria:

• If isolation voltage specification is 5000Vrms or higher, use 4N37M-V
• If output voltage specification exceeds 30V, use 4N37M-V
• If operating temperature extends below -40°C or above 100°C, use 4N37M-V
• If RoHS3 compliance is mandatory, use 4N37M-V
• If application permits 4170Vrms isolation, 30V output maximum, and -40°C to 100°C operation, 4N37TVM is acceptable

Frequently Asked Questions (FAQ)

Q: Can the 4N37TVM directly replace the 4N37M-V in all applications?

A: No. The 4N37TVM has lower isolation voltage (4170Vrms versus 5000Vrms), lower maximum output voltage (30V versus 80V), and narrower operating temperature range (-40°C to 100°C versus -55°C to 110°C). Substitution is valid only when application specifications are satisfied within these lower limits.

Q: Are the package dimensions identical between these parts?

A: Yes. Both components use 6-DIP (0.400", 10.16mm) through-hole packages with identical mechanical footprints, enabling direct PCB socket compatibility.

Q: What is the significance of the 100% Current Transfer Ratio specification?

A: Both parts guarantee minimum 100% current transfer ratio at 10mA input current, ensuring consistent optical coupling efficiency and predictable output transistor saturation characteristics across the specified operating range.

Q: Does the 4N37TVM's faster switching time (2µs versus 10µs) create compatibility issues?

A: No. Faster switching performance is generally compatible with applications designed for the 4N37M-V. However, applications with timing-critical circuits should verify that faster response does not introduce unintended signal transitions or timing conflicts.

Q: What does RoHS3 compliance mean for the 4N37M-V?

A: RoHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. This is required for many industrial and consumer applications, particularly in regulated markets.

Q: Can I use the 4N37TVM in a circuit designed for -55°C operation?

A: No. The 4N37TVM operating range begins at -40°C. For applications requiring -55°C operation, the 4N37M-V is required.

Q: Are both parts suitable for high-voltage isolation applications?

A: The 4N37M-V at 5000Vrms is suitable for high-voltage isolation. The 4N37TVM at 4170Vrms provides moderate-to-high isolation. Application voltage requirements determine which part is appropriate.