4N25FVM Equivalent & Substitute Parts

Part Overview

The 4N25FVM is an optoisolator transistor with base output manufactured by onsemi, rated for 7500Vpk isolation voltage in a 6-SMD surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 4N25 series represents the industry standard for single-channel optoisolator transistors with base output, with multiple manufacturers offering compatible alternatives across different package types and isolation voltage ratings.

Substiute Parts

4N25FVM

onsemiIn Stock: 8734N25FVM Datasheet

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4N25

Texas InstrumentsIn Stock: 384244N25 Datasheet

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4N25

Texas InstrumentsIn Stock: 384244N25 Datasheet

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4N25-060E

Broadcom LimitedIn Stock: 9864N25-060E Datasheet

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4N25-X001

Vishay Semiconductor Opto DivisionIn Stock: 9924N25-X001 Datasheet

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4N25V

Vishay Semiconductor Opto DivisionIn Stock: 19164N25V Datasheet

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4N25X

Isocom Components 2004 LTDIn Stock: 12014N25X Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4N25FVM is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Number of Channels: Must be 1
• Current Transfer Ratio (Min): Must be 20% @ 10mA or greater
• Output Type: Must be Transistor with Base
• Operating Temperature Range: Must encompass -55°C ~ 100°C
• Input Type: Must be DC

Mechanical Compatibility Considerations:

• Mounting Type: Surface Mount preferred for direct replacement; Through Hole alternatives available with board-level modifications
• Package / Case: 6-SMD Gull Wing is the primary form factor; 6-DIP alternatives require layout redesign

Isolation Voltage Flexibility:

• The 4N25FVM specifies 7500Vpk isolation. Substitute parts with lower isolation ratings (5000Vrms, 5300Vrms, 2500Vrms) are acceptable for applications not requiring the full 7500Vpk specification
• Substitute parts with equal or higher isolation voltage provide direct electrical equivalence

Compliance and Regulatory:

• REACH Status and RoHS compliance should be evaluated based on end-application requirements
• All listed substitutes maintain MSL 1 (Unlimited) moisture sensitivity

Parameter Comparison

Engineering Selection Recommendations

For Direct Surface Mount Replacement: No active surface mount equivalent exists in the 4N25 series. The 4N25FVM is the only 6-SMD variant listed. Designs requiring surface mount form factor must either source remaining 4N25FVM inventory or redesign for through-hole alternatives with appropriate PCB layout modifications.

For Through-Hole Substitution with Highest Isolation Voltage: The 4N25X (Isocom Components) provides 5300Vrms isolation in 6-DIP package, the closest match to the 4N25FVM's 7500Vpk specification among active products. This part is ROHS3 compliant and REACH unaffected.

For General-Purpose Applications with Lower Isolation Requirements: The 4N25V (Vishay) and 4N25-X001 (Vishay) both provide 5000Vrms isolation with active product status. The 4N25V offers improved Vce saturation (300mV vs 500mV), beneficial for low-power output applications. Both are ROHS3 compliant.

For Maximum Output Current Capability: The 4N25-060E (Broadcom) supports 100mA output current, double the standard 50mA specification, with 2500Vrms isolation suitable for lower-voltage isolation requirements. ROHS3 compliant and REACH unaffected.

For Regulatory Compliance: Applications requiring ROHS3 compliance should select 4N25-060E, 4N25-X001, 4N25V, or 4N25X. The Texas Instruments 4N25 is RoHS non-compliant and REACH affected, limiting use in regulated markets.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the 4N25FVM with a through-hole 6-DIP package substitute?

A: Direct pin-for-pin replacement is not possible due to package form factor differences. The 4N25FVM uses 6-SMD surface mount while all active substitutes use 6-DIP through-hole. PCB redesign is required, though pin assignments remain compatible across the 4N25 series.

Q: What is the minimum isolation voltage required for substitution?

A: Substitution is determined by application requirements, not the original 7500Vpk specification. The 4N25-060E at 2500Vrms is electrically compatible for applications requiring only 2500Vrms isolation. For applications requiring the full 7500Vpk isolation, only the 4N25X (5300Vrms) approaches this specification among active products.

Q: Are all substitute parts electrically compatible with the 4N25FVM?

A: All listed substitutes maintain the core electrical specifications: single channel, 20% minimum current transfer ratio at 10mA, transistor with base output, and -55°C to 100°C operating range. Differences in output voltage rating, output current capability, and switching times must be evaluated against specific circuit requirements.

Q: Which substitute offers the best performance for low-power applications?

A: The 4N25V (Vishay) provides the lowest Vce saturation at 300mV, reducing power dissipation in the output stage. This is beneficial for battery-powered or low-power designs.

Q: What are the compliance implications of selecting different manufacturers?

A: Texas Instruments 4N25 is RoHS non-compliant and REACH affected. All other substitutes (Broadcom, Vishay, Isocom) are ROHS3 compliant. For applications in regulated markets or with environmental compliance requirements, select from Broadcom, Vishay, or Isocom alternatives.

Q: Can I use the 4N25-060E with higher isolation voltage requirements?

A: The 4N25-060E is rated for 2500Vrms isolation. It cannot be used in applications requiring higher isolation voltages. For applications requiring 5000Vrms or higher, select 4N25 (Texas Instruments), 4N25-X001 (Vishay), 4N25V (Vishay), or 4N25X (Isocom).

Q: What is the inventory status of substitute parts?

A: Texas Instruments 4N25 has the highest inventory at 38,411 pieces. Vishay 4N25V has 1,812 pieces. Isocom 4N25X has 1,150 pieces. Vishay 4N25-X001 has 914 pieces. Broadcom 4N25-060E has 903 pieces. Availability should be confirmed with suppliers for production quantities.