4N25FR2VM Equivalent & Substitute Parts

Part Overview

The 4N25FR2VM is an optoisolator transistor with base output manufactured by onsemi, featuring 7500Vpk isolation voltage in a 6-SMD surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The 4N25FR2VM serves applications requiring galvanic isolation with transistor output capability and integrated base connection for enhanced switching control.

Key Parameters

Parameter	Value
Manufacturer Part Number	4N25FR2VM
Manufacturer	onsemi
Category	Optoisolators
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	7500Vpk
Current Transfer Ratio (Min)	20% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Voltage - Forward (Vf) (Typ)	1.18V
Current - DC Forward (If) (Max)	60 mA
Vce Saturation (Max)	500mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing
Turn On / Turn Off Time (Typ)	2µs, 2µs

Substitute Part Grouping Explanation

Substitution for the 4N25FR2VM is determined by the following critical parameters:

Isolation Voltage: The 4N25FR2VM specifies 7500Vpk isolation. Substitutes must maintain isolation voltage at or above this level to ensure equivalent safety and performance margins.
Output Type: All substitutes must feature transistor output with base connection to maintain circuit compatibility.
Current Transfer Ratio: Minimum 20% @ 10mA is required for functional equivalence.
Mounting Type and Package: Surface mount 6-SMD packaging is specific to the 4N25FR2VM. Through-hole alternatives represent different form factors and may require PCB redesign.
Operating Temperature Range: The -55°C ~ 100°C range must be supported or exceeded.
Vce Saturation and Output Voltage: Maximum ratings of 500mV saturation and 30V output voltage define switching performance boundaries.

Substitutes are grouped into two categories: direct surface mount equivalents (same package) and functional alternatives (different packages requiring design modification).

Parameter Comparison

Parameter	4N25FR2VM (Main)	4N25SR2VM	4N25 (TI)	4N25-060E	4N25-X001	4N25V	4N25X
Manufacturer	onsemi	onsemi	Texas Instruments	Broadcom Limited	Vishay Semiconductor	Vishay Semiconductor	Isocom Components
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Voltage - Isolation	7500Vpk	4170Vrms	5000Vrms	2500Vrms	5000Vrms	5000Vrms	5300Vrms
Number of Channels	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	30V	30V	70V	30V	70V	32V	30V
Voltage - Forward (Vf) (Typ)	1.18V	1.18V	1.3V	1.2V	1.36V	1.2V	1.2V
Current - DC Forward (If) (Max)	60 mA	60 mA	60 mA	80 mA	60 mA	60 mA	60 mA
Vce Saturation (Max)	500mV	500mV	500mV	500mV	500mV	300mV	500mV
Operating Temperature	-55°C ~ 100°C	-40°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	6-SMD, Gull Wing	6-SMD, Gull Wing	6-DIP	6-DIP	6-DIP	6-DIP	6-DIP
Turn On / Turn Off Time (Typ)	2µs, 2µs	2µs, 2µs	—	—	—	11µs, 7µs	—
Rise / Fall Time (Typ)	—	—	2µs, 2µs	3µs, 3µs	2µs, 2µs	7µs, 6.7µs	2µs, 2µs

Engineering Selection Recommendations

Direct Surface Mount Substitute (Recommended for PCB Compatibility):

The 4N25SR2VM is the primary surface mount alternative, maintaining the 6-SMD gull wing package format of the 4N25FR2VM. While the 4N25SR2VM specifies 4170Vrms isolation (lower than the 7500Vpk of the main part), it remains active in production with ROHS3 compliance. This substitute is suitable for applications where the reduced isolation voltage remains within system safety margins and where surface mount form factor is mandatory.

Through-Hole Alternatives (Functional Equivalents Requiring Design Modification):

For applications permitting PCB redesign, the following through-hole optoisolators provide active product status and higher isolation voltage ratings:

4N25-X001 (Vishay): 5000Vrms isolation, 6-DIP package, ROHS3 compliant, active status
4N25V (Vishay): 5000Vrms isolation, 6-DIP package, ROHS3 compliant, active status, improved Vce saturation (300mV)
4N25X (Isocom): 5300Vrms isolation, 6-DIP package, ROHS3 compliant, active status

The 4N25-060E (Broadcom) offers the lowest isolation voltage (2500Vrms) and is suitable only for applications with reduced isolation requirements.

All active substitutes maintain the 20% minimum current transfer ratio, transistor with base output configuration, and -55°C ~ 100°C operating temperature range. Selection should prioritize active product status and compliance certifications for long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can the 4N25SR2VM directly replace the 4N25FR2VM without PCB modification?

A: Yes. The 4N25SR2VM shares the identical 6-SMD surface mount package and gull wing footprint. Pin configuration and electrical interface are compatible. The reduced isolation voltage (4170Vrms vs. 7500Vpk) must be evaluated against system safety requirements.

Q: What is the difference between Vpk and Vrms isolation voltage specifications?

A: Vpk (peak voltage) and Vrms (RMS voltage) represent different measurement standards for isolation rating. Direct comparison requires conversion: 7500Vpk ≈ 5303Vrms. The 4N25SR2VM at 4170Vrms is lower than the original specification and should be selected only when system isolation margins permit.

Q: Why are most substitutes through-hole 6-DIP packages when the original is surface mount 6-SMD?

A: The 4N25 optoisolator family exists in multiple package formats across different manufacturers. Surface mount 6-SMD variants are less common in current production. Through-hole 6-DIP packages remain widely available from multiple manufacturers, but require PCB redesign for implementation.

Q: Are all listed substitutes RoHS compliant?

A: The 4N25SR2VM, 4N25-X001, 4N25V, and 4N25X are ROHS3 compliant. The Texas Instruments 4N25 is RoHS non-compliant. Compliance requirements should be verified against system specifications before selection.

Q: What is the significance of the 300mV Vce saturation in the 4N25V?

A: The 4N25V features improved saturation voltage (300mV vs. 500mV standard), resulting in lower collector-emitter voltage drop during transistor saturation. This reduces power dissipation and heat generation in switching applications, providing performance advantage over standard variants.

Q: Can I use the 4N25-060E as a substitute if isolation voltage is not critical?

A: The 4N25-060E is functionally compatible but specifies only 2500Vrms isolation, the lowest among available substitutes. Use is limited to applications with reduced isolation requirements. Higher isolation alternatives should be prioritized when system specifications permit.

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