4N37S(TB)-V Equivalent & Substitute Parts

Part Overview

The 4N37S(TB)-V is an optoisolator transistor with base output manufactured by Everlight Electronics Co Ltd. This component provides galvanic isolation up to 5000Vrms 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 functional performance can be achieved within specified electrical and mechanical parameter tolerances, or when application requirements permit operation at reduced isolation voltage or output specifications.

Substiute Parts

4N37S(TB)-V

Everlight Electronics Co LtdIn Stock: 8784N37S(TB)-V Datasheet

Current PartRFQ

4N37S-TA1

Lite-On Inc.In Stock: 220534N37S-TA1 Datasheet

SimilarRFQ

4N37SM

onsemiIn Stock: 127594N37SM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N37S(TB)-V are identified based on the following critical parameters that define functional equivalence:

Primary Substitution Criteria:

• Number of Channels: 1 (must match)
• Output Type: Transistor with Base (must match)
• Input Type: DC (must match)
• Package / Case: 6-SMD, Gull Wing (must match)
• Mounting Type: Surface Mount (must match)
• Current Transfer Ratio (Min): 100% @ 10mA (must match)
• Voltage - Forward (Vf) (Typ): 1.2V nominal (acceptable tolerance)
• Current - DC Forward (If) (Max): 60 mA (must match)
• Vce Saturation (Max): 300mV (must match)
• RoHS Status: ROHS3 Compliant (must match)
• MSL: 1 (Unlimited) (must match)

Secondary Substitution Parameters (Application-Dependent):

• Voltage - Isolation: May be lower if application isolation requirements permit
• Voltage - Output (Max): May be lower if application voltage requirements permit
• Operating Temperature Range: May be narrower if application temperature range permits
• Turn On / Turn Off Time: May vary if application timing requirements permit

The 4N37S(TB)-V operates at 5000Vrms isolation voltage. Substitute parts with lower isolation ratings (1500Vrms or 4170Vrms) are suitable only for applications where the required isolation voltage is equal to or less than the substitute part specification.

Parameter Comparison

Engineering Selection Recommendations

4N37S-TA1 (Lite-On Inc.) Substitution Criteria:

The 4N37S-TA1 is suitable as a substitute for the 4N37S(TB)-V only in applications where the isolation voltage requirement is 1500Vrms or lower. This part maintains identical current transfer ratio (100% @ 10mA), forward voltage (1.2V), forward current (60 mA), and saturation voltage (300mV) specifications. The maximum output voltage is reduced to 30V compared to the main part's 80V specification. The operating temperature range is -55°C to 100°C, which is narrower than the main part by 10°C at the upper limit. Both parts are RoHS3 compliant with MSL 1 rating. The 4N37S-TA1 is supplied in Tape & Reel packaging with 21996 pieces in stock inventory.

4N37SM (onsemi) Substitution Criteria:

The 4N37SM is suitable as a substitute for the 4N37S(TB)-V in applications where the isolation voltage requirement is 4170Vrms or lower. This part maintains identical current transfer ratio (100% @ 10mA) and forward current (60 mA) specifications. The forward voltage is 1.18V (compared to 1.2V nominal) and saturation voltage remains at 300mV. The maximum output voltage is reduced to 30V. The turn-on and turn-off times are significantly faster at 2µs each compared to the main part's 10µs and 9µs. The operating temperature range is -40°C to 100°C, which is narrower than the main part at both limits. Both parts are RoHS3 compliant with MSL 1 rating. The 4N37SM is supplied in Tube packaging with 12680 pieces in stock inventory.

Selection Logic:

• If application requires 5000Vrms isolation and 80V output voltage: Use 4N37S(TB)-V (main part)
• If application requires ≤1500Vrms isolation and ≤30V output voltage: 4N37S-TA1 is acceptable
• If application requires ≤4170Vrms isolation and ≤30V output voltage: 4N37SM is acceptable
• If application requires faster switching response (2µs vs 10µs): 4N37SM provides superior performance
• If application requires extended upper temperature operation (110°C): 4N37S(TB)-V is required

All three parts are Active product status and fully RoHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can the 4N37S-TA1 replace the 4N37S(TB)-V in all applications?

A: No. The 4N37S-TA1 has a maximum isolation voltage of 1500Vrms compared to the 4N37S(TB)-V's 5000Vrms. Substitution is only valid if your application isolation requirement is 1500Vrms or lower. Additionally, the maximum output voltage is 30V versus 80V on the main part.

Q: What is the key difference between the 4N37SM and 4N37S-TA1?

A: The 4N37SM provides 4170Vrms isolation (higher than 4N37S-TA1's 1500Vrms) and significantly faster switching times of 2µs on/off compared to the main part's 10µs/9µs. Both have identical 30V maximum output voltage and 100% current transfer ratio at 10mA.

Q: Are all three parts in the same package?

A: Yes. All three parts use 6-SMD, Gull Wing surface mount packages suitable for identical PCB layouts. However, packaging format differs: 4N37S(TB)-V uses standard packaging, 4N37S-TA1 is supplied in Tape & Reel, and 4N37SM is supplied in Tube.

Q: What happens if I use a substitute part with lower isolation voltage than required?

A: Using a substitute with insufficient isolation voltage violates the safety and functional requirements of your application. The isolation barrier may fail under specified voltage stress, creating a safety hazard and component failure.

Q: Do all three parts meet RoHS3 compliance?

A: Yes. All three parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, suitable for standard manufacturing and storage conditions.

Q: Which substitute offers the best switching performance?

A: The 4N37SM provides the fastest switching response with 2µs turn-on and turn-off times, compared to the main part's 10µs and 9µs. This is beneficial for high-frequency switching applications where the isolation voltage requirement is 4170Vrms or lower.

Q: What is the operating temperature consideration for substitution?

A: The 4N37S(TB)-V operates from -55°C to 110°C. The 4N37S-TA1 operates to 100°C, and the 4N37SM to 100°C. If your application requires operation above 100°C, only the main part is suitable.

Q: Can I use these parts interchangeably on the same PCB?

A: Yes, from a physical and electrical interface perspective, all three parts use identical 6-SMD Gull Wing packages. However, electrical performance differs significantly in isolation voltage, output voltage, and switching speed. Substitution must be validated against specific application requirements.