4N35FVM Equivalent & Substitute Parts

Part Overview

The 4N35FVM is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications. This component features a 7500Vpk isolation rating and operates as a single-channel optoisolator in a 6-SMD surface mount package. The 4N35FVM is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

4N35FVM

onsemiIn Stock: 12044N35FVM Datasheet

Current PartRFQ

4N35SVM

onsemiIn Stock: 224714N35SVM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4N35FVM is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Number of channels: 1 channel (fixed requirement)
• Output type: Transistor with Base (fixed requirement)
• Current Transfer Ratio (Min): 100% @ 10mA (minimum performance threshold)
• Voltage - Output (Max): 30V (maximum output voltage capability)
• Vce Saturation (Max): 300mV (saturation voltage limit)
• Voltage - Forward (Vf) (Typ): 1.18V (input diode forward voltage)
• Current - DC Forward (If) (Max): 60 mA (maximum input current)
• Turn On / Turn Off Time (Typ): 2µs, 2µs (switching speed requirement)

Mechanical Compatibility Requirements:

• Mounting Type: Surface Mount (fixed requirement)
• Package / Case: 6-SMD, Gull Wing (fixed requirement)

Isolation Voltage Consideration: The 4N35FVM specifies 7500Vpk isolation. Substitute parts may have different isolation voltage ratings provided they meet or exceed the minimum isolation requirement for the application circuit.

Temperature Range Consideration: The 4N35FVM operates from -55°C to 100°C. Substitute parts with narrower operating ranges may be acceptable if the application does not require the full temperature span.

Parameter Comparison

Engineering Selection Recommendations

The 4N35SVM is a direct functional substitute for the 4N35FVM based on electrical and mechanical parameter alignment. Both components share identical channel count, output type, current transfer ratio, output voltage rating, forward voltage, maximum forward current, saturation voltage, and switching speed specifications.

The 4N35SVM is currently in active production status, whereas the 4N35FVM is obsolete. This makes the 4N35SVM the appropriate selection for new designs and ongoing procurement requirements.

The 4N35SVM carries ROHS3 compliance certification, providing regulatory advantage for applications subject to RoHS requirements. The 4N35FVM compliance status is not specified in available documentation.

The isolation voltage differs between the two parts: 4N35FVM specifies 7500Vpk while 4N35SVM specifies 4170Vrms. Applications requiring the full 7500Vpk isolation rating of the original part must evaluate whether the 4170Vrms rating of the substitute meets circuit isolation requirements.

The operating temperature range of the 4N35SVM (-40°C to 100°C) is narrower than the 4N35FVM (-55°C to 100°C). Applications operating below -40°C require confirmation that the substitute part meets temperature specifications.

Frequently Asked Questions (FAQ)

Q: Can the 4N35SVM directly replace the 4N35FVM in existing designs?

A: The 4N35SVM matches all critical electrical parameters of the 4N35FVM including channel count, output type, current transfer ratio, output voltage, forward voltage, saturation voltage, and switching speed. Mechanical compatibility is confirmed through identical 6-SMD Gull Wing packaging. Substitution is valid provided the application isolation voltage requirement does not exceed 4170Vrms and the operating temperature range does not go below -40°C.

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

A: These represent different measurement standards for isolation voltage. The 4N35FVM specifies peak voltage (Vpk) while the 4N35SVM specifies RMS voltage (Vrms). The isolation voltage rating determines the maximum voltage differential that can be safely applied across the isolation barrier. Applications must confirm that the 4170Vrms rating of the substitute meets the isolation requirements of the circuit.

Q: Are there packaging differences between these parts?

A: Both parts use identical 6-SMD Gull Wing surface mount packages. The 4N35SVM is supplied in Tube packaging while the 4N35FVM packaging format is not specified. This does not affect component functionality or PCB assembly compatibility.

Q: Why is the 4N35FVM classified as obsolete?

A: The 4N35FVM is no longer in active production. The 4N35SVM represents the current active equivalent from onsemi for this optoisolator family. New designs should specify the 4N35SVM to ensure long-term availability and supply chain continuity.

Q: Does the 4N35SVM meet RoHS requirements?

A: The 4N35SVM carries ROHS3 compliance certification. The 4N35FVM RoHS status is not documented. Applications subject to RoHS regulations benefit from the certified compliance of the 4N35SVM.