4N37FR2VM Equivalent & Substitute Parts

Part Overview

The 4N37FR2VM is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications requiring 7500Vpk isolation rating. This component integrates a photodiode input stage with a transistor output stage including base connection, enabling flexible circuit design in isolated switching and signal transmission applications.

The 4N37FR2VM is classified as obsolete. Identifying suitable substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for systems currently utilizing this component.

Substiute Parts

4N37FR2VM

onsemiIn Stock: 9514N37FR2VM Datasheet

Current PartRFQ

4N37SR2VM

onsemiIn Stock: 29804N37SR2VM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4N37FR2VM is determined by the following critical parameters:

Mandatory Compatibility Parameters:

• Single channel configuration (Number of Channels = 1)
• Transistor output with base connection (Output Type)
• 6-SMD surface mount package with gull wing leads (Package / Case)
• Minimum current transfer ratio of 100% @ 10mA
• Maximum output voltage of 30V
• Input type: DC

Isolation Voltage Consideration: The 4N37FR2VM specifies 7500Vpk isolation. Substitute parts with lower isolation ratings (such as 4170Vrms) may be considered for applications where the full isolation specification is not required, provided all other electrical and mechanical parameters remain compatible.

Temperature Range: The 4N37FR2VM operates across -55°C to 100°C. Substitutes with narrower operating ranges must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The 4N37SR2VM is identified as an active substitute for the obsolete 4N37FR2VM based on the following factors:

Electrical Compatibility: Both parts share identical electrical characteristics across all critical parameters: current transfer ratio, output voltage rating, forward voltage, saturation voltage, and switching times. This ensures functional equivalence in circuit operation.

Mechanical Compatibility: Both components utilize the same 6-SMD gull wing surface mount package, enabling direct board-level substitution without PCB redesign.

Product Status: The 4N37SR2VM maintains active product status with current manufacturing support, addressing the supply chain limitation of the obsolete 4N37FR2VM.

Compliance: The 4N37SR2VM is ROHS3 compliant, supporting modern regulatory requirements. Both parts maintain REACH unaffected status and EAR99 export classification.

Isolation Voltage Differential: The 4N37SR2VM specifies 4170Vrms isolation compared to the 4N37FR2VM's 7500Vpk isolation. Applications requiring the full 7500Vpk isolation specification must evaluate whether the reduced isolation rating of the substitute is acceptable for their specific circuit requirements.

Temperature Range: The 4N37SR2VM operates from -40°C to 100°C, compared to the 4N37FR2VM's -55°C to 100°C range. Applications requiring operation below -40°C must confirm compatibility with the substitute's lower temperature limit.

Frequently Asked Questions (FAQ)

Q: Can the 4N37SR2VM directly replace the 4N37FR2VM in existing designs?

A: Direct replacement is possible from an electrical and mechanical standpoint, as both components share identical pin configuration, package type, and core electrical specifications. However, the reduced isolation voltage rating (4170Vrms vs. 7500Vpk) must be evaluated against application requirements. Additionally, the narrower operating temperature range (-40°C to 100°C vs. -55°C to 100°C) must be confirmed as acceptable for the target application environment.

Q: What are the key differences between these two parts?

A: The primary differences are product status (obsolete vs. active), isolation voltage rating (7500Vpk vs. 4170Vrms), operating temperature range (-55°C to 100°C vs. -40°C to 100°C), and RoHS compliance status (not specified vs. ROHS3 compliant). All other electrical and mechanical parameters are identical.

Q: Is the 4N37SR2VM suitable for high-voltage isolation applications?

A: The 4N37SR2VM provides 4170Vrms isolation, which is suitable for many industrial and consumer applications. Applications specifically requiring 7500Vpk isolation must evaluate whether this reduced rating meets their isolation requirements or if alternative components with higher isolation specifications are necessary.

Q: Are there any packaging differences between these parts?

A: No. Both the 4N37FR2VM and 4N37SR2VM use identical 6-SMD gull wing surface mount packaging, enabling direct PCB-level substitution without layout modifications.

Q: What is the significance of the 4N37 base product number?

A: The 4N37 base product number indicates both parts belong to the same optoisolator transistor family from onsemi. Variations in the suffix (FR2VM vs. SR2VM) reflect differences in isolation voltage rating, product status, and compliance certifications while maintaining core functional compatibility.