4N35FR2VM Equivalent & Substitute Parts

Part Overview

The 4N35FR2VM 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 direct interfacing with logic and power circuits. The part is classified as obsolete, necessitating identification of functionally compatible alternatives for new designs and ongoing production requirements.

Substiute Parts

4N35FR2VM

onsemiIn Stock: 10924N35FR2VM Datasheet

Current PartRFQ

4N35SR2VM

onsemiIn Stock: 71934N35SR2VM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4N35FR2VM is determined by the following critical parameters:

Mandatory Matching Criteria:

• Single channel configuration
• Transistor with base output topology
• 6-SMD, Gull Wing package
• Surface mount mounting type
• Minimum current transfer ratio of 100% @ 10mA
• Maximum output voltage of 30V
• Input type: DC
• Moisture sensitivity level MSL 1

Allowable Variation:

• Voltage isolation rating: The 4N35FR2VM specifies 7500Vpk isolation. Substitute parts may have lower isolation ratings provided they meet or exceed application requirements.
• Operating temperature range: The 4N35FR2VM operates from -55°C to 100°C. Substitute parts with narrower ranges (such as -40°C to 100°C) are acceptable if the application temperature profile falls within the substitute's specified range.
• Product status: Active status substitutes are preferred for ongoing availability.

Parameter Comparison

Engineering Selection Recommendations

The 4N35SR2VM is a direct functional substitute for the 4N35FR2VM based on the following factors:

Electrical Compatibility: Both parts share identical current transfer ratio specifications (100% @ 10mA), switching times (2µs on/off), output voltage ratings (30V maximum), forward voltage characteristics (1.18V typical), and saturation voltage (300mV maximum). These parameters ensure equivalent electrical performance in circuit applications.

Package and Mounting Compatibility: Both components utilize the 6-SMD Gull Wing surface mount package, enabling direct board-level substitution without layout modifications.

Isolation Rating Consideration: The 4N35SR2VM provides 4170Vrms isolation compared to the 4N35FR2VM's 7500Vpk isolation. The lower isolation rating of the substitute is acceptable for applications where the required isolation voltage does not exceed 4170Vrms. Applications requiring the full 7500Vpk isolation specification cannot use this substitute.

Product Status and Availability: The 4N35SR2VM maintains active product status with 7100 pieces in stock, providing superior long-term availability compared to the obsolete 4N35FR2VM (1006 pieces in stock).

Compliance: The 4N35SR2VM carries ROHS3 compliance certification, meeting current environmental regulatory requirements. Both parts maintain REACH Unaffected status and identical ECCN/HTSUS classifications.

Temperature Range: The 4N35SR2VM operates across -40°C to 100°C. Applications requiring operation below -40°C must retain the 4N35FR2VM or identify alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can the 4N35SR2VM directly replace the 4N35FR2VM in all applications?

A: Direct substitution is possible only when the application isolation voltage requirement does not exceed 4170Vrms and the operating temperature range remains within -40°C to 100°C. The 4N35SR2VM is electrically and mechanically compatible for these conditions. Applications requiring 7500Vpk isolation or sub -40°C operation require alternative components.

Q: What is the difference between 7500Vpk and 4170Vrms isolation ratings?

A: These represent different measurement standards for isolation voltage. Peak voltage (Vpk) and RMS voltage (Vrms) are distinct specifications. The 4N35FR2VM specifies peak isolation voltage while the 4N35SR2VM specifies RMS isolation voltage. Direct numerical comparison requires conversion between these standards based on the waveform characteristics of the application.

Q: Are the 6-SMD packages identical between both parts?

A: Both parts use 6-SMD Gull Wing surface mount packages with identical pinout and footprint geometry, enabling direct PCB substitution without layout changes.

Q: What is the inventory status difference?

A: The 4N35FR2VM (obsolete) has 1006 pieces available in bulk packaging. The 4N35SR2VM (active) has 7100 pieces available in Tape & Reel packaging. The active status and higher inventory of the 4N35SR2VM provide superior availability for production requirements.

Q: Does the 4N35SR2VM meet current environmental standards?

A: The 4N35SR2VM is ROHS3 compliant and REACH Unaffected, meeting current environmental regulatory requirements. The 4N35FR2VM does not specify RoHS compliance status.

Q: Are the switching characteristics identical?

A: Yes. Both parts specify identical turn-on and turn-off times of 2µs, ensuring equivalent switching performance in circuit applications.