4N25S(TB) Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N25S(TB) is an optoisolator transistor with base output manufactured by Everlight Electronics Co Ltd. This component provides 5000Vrms isolation with a single channel configuration in a 6-SMD surface mount package. The device is classified as Active product status and is ROHS3 compliant.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the allowed specifications for optoisolator transistor applications. Substitution becomes necessary due to inventory availability, supply chain considerations, or packaging format requirements while maintaining functional compatibility.

Substiute Parts

4N25S(TB)

Everlight Electronics Co LtdIn Stock: 7954N25S(TB) Datasheet

Current PartRFQ

4N25-X007T

Vishay Semiconductor Opto DivisionIn Stock: 125894N25-X007T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4N25S(TB) is determined by the following critical parameters:

Mandatory Matching Parameters:

• Voltage - Isolation: 5000Vrms
• Number of Channels: 1
• Output Type: Transistor with Base
• Input Type: DC
• Mounting Type: Surface Mount
• Package / Case: 6-SMD, Gull Wing
• Current Transfer Ratio (Min): 20% @ 10mA
• Vce Saturation (Max): 500mV

Allowable Variation Parameters:

• Voltage - Output (Max): 70V to 80V range
• Current - Output / Channel: 50mA to 60mA range
• Voltage - Forward (Vf) (Typ): 1.2V to 1.36V range
• Operating Temperature Range: -55°C to 100°C minimum
• Turn On / Turn Off Time (Typ): 3µs maximum
• Rise / Fall Time (Typ): 2µs to 3µs range

The substitute part 4N25-X007T meets all mandatory matching parameters and operates within allowable variation ranges for output specifications and thermal characteristics.

Parameter Comparison

Engineering Selection Recommendations

4N25-X007T (Vishay Semiconductor Opto Division) Substitution Criteria:

The 4N25-X007T is a direct functional substitute for the 4N25S(TB) based on the following engineering factors:

1. Electrical Compatibility: Both devices maintain identical isolation voltage (5000Vrms), current transfer ratio minimum (20% @ 10mA), and saturation voltage (500mV). The 4N25-X007T output voltage maximum of 70V is within acceptable range for applications designed for the 4N25S(TB) 80V specification.

2. Thermal Performance: The 4N25-X007T operating temperature range of -55°C to 100°C covers the lower end of the 4N25S(TB) range (-55°C to 110°C). Applications operating above 100°C require verification against specific thermal requirements.

3. Switching Characteristics: The 4N25-X007T rise/fall time of 2µs is faster than the 4N25S(TB) turn-on/turn-off time of 3µs, providing improved switching performance.

4. Compliance Status: Both devices are ROHS3 compliant with MSL 1 rating and identical ECCN/HTSUS classifications, ensuring regulatory and supply chain compatibility.

5. Packaging: Both devices use 6-SMD Gull Wing surface mount packages. The 4N25-X007T is supplied in Tape & Reel format, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 4N25-X007T replace the 4N25S(TB) in all applications?

A: The 4N25-X007T is electrically compatible for applications where the output voltage requirement does not exceed 70V and operating temperature does not exceed 100°C. The identical isolation voltage, current transfer ratio, and saturation voltage specifications ensure functional equivalence within these parameter boundaries.

Q: What is the difference in packaging between these two parts?

A: The 4N25S(TB) packaging format is not specified in the provided data. The 4N25-X007T is supplied in Tape & Reel (TR) format, which is standard for automated surface mount assembly. Both use identical 6-SMD Gull Wing package geometry.

Q: Are there thermal considerations when substituting the 4N25-X007T?

A: The 4N25-X007T maximum operating temperature is 100°C, compared to 110°C for the 4N25S(TB). Applications requiring operation above 100°C must use the 4N25S(TB) or verify that the 4N25-X007T thermal derating does not impact circuit performance.

Q: Do both parts have the same isolation rating?

A: Yes. Both the 4N25S(TB) and 4N25-X007T provide 5000Vrms isolation with single channel configuration, meeting identical isolation requirements.

Q: What is the significance of the Current Transfer Ratio specification?

A: The Current Transfer Ratio minimum of 20% @ 10mA is identical for both parts. This parameter defines the ratio of output collector current to input LED current and is critical for circuit design. Both devices meet this specification.

Q: Are there any compliance differences between these parts?

A: Both parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. Both carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications, ensuring equivalent regulatory and export compliance status.

Q: What does Vce Saturation specification indicate?

A: Vce Saturation (Max) of 500mV for both parts specifies the maximum voltage drop across the output transistor in saturation state. Identical specifications ensure equivalent power dissipation and circuit behavior.