4N35S(TB) Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N35S(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 required for design flexibility, supply chain alternatives, or packaging format changes while maintaining functional compatibility within specified parameter ranges.

Substiute Parts

4N35S(TB)

Everlight Electronics Co LtdIn Stock: 9314N35S(TB) Datasheet

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4N35-X007T

Vishay Semiconductor Opto DivisionIn Stock: 48254N35-X007T Datasheet

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4N35-X017

Vishay Semiconductor Opto DivisionIn Stock: 28794N35-X017 Datasheet

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4N35-X017T

Vishay Semiconductor Opto DivisionIn Stock: 163114N35-X017T Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N35S(TB) are qualified based on the following critical parameters that determine functional equivalence:

Isolation Voltage: All substitute parts maintain 5000Vrms isolation voltage, matching the primary specification.

Channel Configuration: All substitutes provide single channel operation consistent with the main part.

Output Type: All substitutes feature transistor with base output configuration.

Input Type: All substitutes accept DC input signals.

Package Format: All substitutes use 6-SMD, Gull Wing surface mount package with identical supplier device package designation.

Current Transfer Ratio: All substitutes meet or exceed 100% @ 10mA minimum specification.

Forward Voltage: All substitutes maintain 1.2V typical forward voltage.

DC Forward Current: All substitutes support 60 mA maximum DC forward current.

Compliance: All substitutes are ROHS3 compliant with MSL 1 rating.

Product Status: All substitutes maintain Active product status.

The primary differences among substitutes are packaging format (Tape & Reel versus Tube), maximum output voltage (30V versus 80V), output current per channel (50mA versus unspecified), Vce saturation specification availability, and operating temperature upper limit (100°C versus 110°C).

Parameter Comparison

Engineering Selection Recommendations

All three Vishay Semiconductor Opto Division substitute parts (4N35-X007T, 4N35-X017, 4N35-X017T) maintain Active product status and ROHS3 compliance, qualifying them as functionally equivalent alternatives to the 4N35S(TB) for applications within specified parameter boundaries.

Output Voltage Consideration: The 4N35S(TB) specifies maximum output voltage of 80V, while all Vishay substitutes specify 30V maximum output voltage. Applications requiring output voltages exceeding 30V are not compatible with the Vishay substitute parts.

Operating Temperature Range: The 4N35S(TB) operates to 110°C maximum, while Vishay substitutes operate to 100°C maximum. Applications requiring operation above 100°C require the 4N35S(TB).

Packaging Format Selection:

• 4N35-X017T: Tape & Reel format, highest inventory availability (16,239 pcs)
• 4N35-X007T: Tape & Reel format, moderate inventory (4,715 pcs)
• 4N35-X017: Tube format, moderate inventory (2,769 pcs)

Tape & Reel packaging is standard for automated assembly processes. Tube packaging is suitable for manual assembly or lower-volume applications.

Vce Saturation: The 4N35S(TB) specifies 300mV maximum Vce saturation. Vishay substitutes do not provide this specification. Applications with strict saturation voltage requirements should verify Vishay datasheet specifications before substitution.

Frequently Asked Questions (FAQ)

Q: Can 4N35-X017T substitute for 4N35S(TB) in all applications?

A: Substitution is valid only when application requirements do not exceed 30V maximum output voltage and 100°C maximum operating temperature. The 4N35S(TB) supports higher output voltage (80V) and higher operating temperature (110°C). Verify application specifications against these limits before substitution.

Q: What is the difference between 4N35-X017T and 4N35-X007T?

A: Both parts are electrically identical with identical electrical parameters. The primary difference is packaging format: 4N35-X017T is supplied in Tape & Reel format with higher inventory availability (16,239 pcs), while 4N35-X007T is also Tape & Reel format with lower inventory (4,715 pcs). Both are suitable for automated assembly.

Q: Why does 4N35-X017 use Tube packaging instead of Tape & Reel?

A: 4N35-X017 is supplied in Tube packaging format. This format is suitable for manual assembly, lower-volume production, or applications where Tape & Reel format is not required. Electrical specifications are identical to the Tape & Reel variants.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 4N35S(TB) and all three substitute parts (4N35-X007T, 4N35-X017, 4N35-X017T) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the significance of the 100% Current Transfer Ratio specification?

A: Current Transfer Ratio (CTR) of 100% @ 10mA indicates that all parts maintain minimum 100% CTR when forward current is 10mA. This specification is identical across the main part and all substitutes, ensuring consistent optical coupling efficiency.

Q: Can I use 4N35-X017 (Tube) in place of 4N35-X017T (Tape & Reel)?

A: Yes, from an electrical and functional standpoint. Both parts have identical electrical specifications. The difference is packaging format only. Tube format is suitable for manual assembly or lower-volume applications, while Tape & Reel is optimized for automated pick-and-place assembly.

Q: What parameters must match for substitution to be valid?

A: Critical matching parameters are: isolation voltage (5000Vrms), channel count (1), output type (transistor with base), input type (DC), package format (6-SMD Gull Wing), current transfer ratio (100% @ 10mA), forward voltage (1.2V), and DC forward current (60mA). Application-specific requirements for output voltage and operating temperature must also be verified.