4N25S-TA Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N25S-TA is an optoisolator transistor with base output manufactured by Lite-On Inc., designed for 2500Vrms isolation applications in single-channel configurations. This component is classified as Active status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to inventory constraints, packaging preferences, or manufacturer availability while maintaining functional compatibility in circuit design.

Key Parameters

Parameter	Value
Voltage - Isolation	2500Vrms
Number of Channels	1
Current Transfer Ratio (Min)	20% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Current - Output / Channel	100mA
Vce Saturation (Max)	500mV
Operating Temperature	-55°C ~ 100°C
Package / Case	6-SMD, Gull Wing
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 4N25S-TA are classified into two distinct groups based on electrical parameter alignment:

Group 1: Parametric Equivalents (2500Vrms Isolation) Parts 4N25S-TA1, 4N25-300E, and 4N25-500E maintain identical isolation voltage (2500Vrms), current transfer ratio (20% @ 10mA), output voltage (30V), output current (100mA), and saturation voltage (500mV). These parts differ only in packaging format and supplier designation, making them direct functional replacements.

Group 2: Enhanced Isolation Alternatives (4170Vrms Isolation) Parts 4N25SR2M and 4N25SM provide higher isolation voltage (4170Vrms) while maintaining the same current transfer ratio (20% @ 10mA), output voltage (30V), and saturation voltage (500mV). These parts are suitable for applications requiring greater isolation margin but with modified timing characteristics and reduced maximum forward current.

Parameter Comparison

Part Number	Manufacturer	Voltage - Isolation	Current Transfer Ratio (Min)	Voltage - Output (Max)	Current - Output / Channel	Vce Saturation (Max)	Operating Temperature	Packaging
4N25S-TA	Lite-On Inc.	2500Vrms	20% @ 10mA	30V	100mA	500mV	-55°C ~ 100°C	6-SMD
4N25S-TA1	Lite-On Inc.	2500Vrms	20% @ 10mA	30V	100mA	500mV	-55°C ~ 100°C	6-SMD
4N25-300E	Broadcom Limited	2500Vrms	20% @ 10mA	30V	100mA	500mV	-55°C ~ 100°C	6-SMD
4N25-500E	Broadcom Limited	2500Vrms	20% @ 10mA	30V	100mA	500mV	-55°C ~ 100°C	6-SMD
4N25SR2M	onsemi	4170Vrms	20% @ 10mA	30V	—	500mV	-40°C ~ 100°C	6-SMD
4N25SM	onsemi	4170Vrms	20% @ 10mA	30V	—	500mV	-55°C ~ 100°C	6-SMD

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): Select 4N25S-TA1, 4N25-300E, or 4N25-500E when the application requires exact electrical equivalence to the 4N25S-TA. All three parts maintain 2500Vrms isolation, 20% minimum current transfer ratio, 100mA output current, and -55°C to 100°C operating range. Selection among these three is determined by packaging availability: 4N25S-TA1 is supplied in Cut Tape and Digi-Reel format; 4N25-300E is supplied in Tube; 4N25-500E is supplied in Tape & Reel. All are ROHS3 compliant and Active status.

For Enhanced Isolation Margin: Select 4N25SR2M or 4N25SM when the application benefits from higher isolation voltage (4170Vrms) while accepting modified timing characteristics. Both parts maintain the 20% current transfer ratio and 500mV saturation voltage. 4N25SR2M operates from -40°C to 100°C; 4N25SM operates from -55°C to 100°C. Both are ROHS3 compliant and Active status. Note that maximum forward current is reduced to 60mA for these alternatives.

Frequently Asked Questions (FAQ)

Q: Can 4N25S-TA1 be used as a direct replacement for 4N25S-TA? A: Yes. Both parts share identical electrical specifications: 2500Vrms isolation, 20% current transfer ratio, 30V maximum output voltage, 100mA output current, and 500mV saturation voltage. The difference is packaging format; 4N25S-TA1 is supplied in Cut Tape and Digi-Reel while 4N25S-TA is supplied in standard packaging.

Q: What is the difference between the Lite-On 4N25S-TA and Broadcom 4N25-300E? A: Electrical specifications are identical. Both provide 2500Vrms isolation and equivalent performance parameters. The primary difference is manufacturer and packaging: 4N25-300E is supplied in Tube format by Broadcom Limited.

Q: Can 4N25SR2M replace 4N25S-TA in all applications? A: 4N25SR2M provides higher isolation voltage (4170Vrms versus 2500Vrms) and faster switching times (2µs versus 3µs), making it suitable for applications requiring greater isolation margin. However, maximum forward current is reduced to 60mA, and the operating temperature range is -40°C to 100°C instead of -55°C to 100°C. Verify these differences against circuit requirements before substitution.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts (4N25S-TA1, 4N25-300E, 4N25-500E, 4N25SR2M, and 4N25SM) are ROHS3 compliant and carry Active product status.

Q: What packaging options are available for 2500Vrms equivalents? A: The 2500Vrms optoisolators are available in three packaging formats: 4N25S-TA1 (Cut Tape & Digi-Reel), 4N25-300E (Tube), and 4N25-500E (Tape & Reel). Selection depends on assembly process requirements and inventory management preferences.

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