4N353S Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N353S is an optoisolator transistor with base output manufactured by onsemi, rated for 5300Vrms isolation voltage in a 6-SMD surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 4N353S provides galvanic isolation for low-speed switching applications with a single transistor output channel, 100% minimum current transfer ratio at 10mA input, and operation across -55°C to 100°C. The obsolete status requires identification of active alternative components that maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

4N353S

onsemiIn Stock: 11204N353S Datasheet

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4N35SVM

onsemiIn Stock: 224714N35SVM Datasheet

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4N35-300E

Broadcom LimitedIn Stock: 31654N35-300E Datasheet

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4N35-500E

Broadcom LimitedIn Stock: 15584N35-500E Datasheet

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4N35-X007

Vishay Semiconductor Opto DivisionIn Stock: 13234N35-X007 Datasheet

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4N35-X007T

Vishay Semiconductor Opto DivisionIn Stock: 48254N35-X007T Datasheet

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4N35-X009

Vishay Semiconductor Opto DivisionIn Stock: 31354N35-X009 Datasheet

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4N35-X009T

Vishay Semiconductor Opto DivisionIn Stock: 20804N35-X009T Datasheet

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4N35S-TA

Lite-On Inc.In Stock: 11264N35S-TA Datasheet

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4N35S-TA1

Lite-On Inc.In Stock: 361674N35S-TA1 Datasheet

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4N35SM

onsemiIn Stock: 15084N35SM Datasheet

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4N35SMT&R

Isocom Components 2004 LTDIn Stock: 7514N35SMT&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 4N353S is determined by the following critical parameters:

Primary Compatibility Criteria:

• Single channel optoisolator with transistor and base output
• 6-SMD surface mount package with gull wing leads
• DC input type
• 30V maximum output voltage
• 300mV maximum Vce saturation
• Moisture sensitivity level 1 (unlimited)
• REACH unaffected or compliant status

Isolation Voltage Grouping: Substitute parts are grouped by isolation voltage rating, as this parameter defines the maximum voltage differential the component can withstand. The 4N353S operates at 5300Vrms. Substitutes with lower isolation ratings (3550Vrms, 4170Vrms, 5000Vrms) remain functionally compatible when the application isolation requirement does not exceed the substitute's rating.

Current Transfer Ratio and Switching Speed: All listed substitutes maintain 100% minimum current transfer ratio at 10mA input. Switching speed varies: onsemi variants provide 2µs turn-on/off times, while Vishay and Broadcom variants provide either 10µs or unspecified timing. Lite-On variants provide 3µs rise/fall times.

Forward Current and Output Current: The 4N353S specifies 100mA maximum DC forward current. Substitute variants range from 50mA to 100mA output current capability, affecting maximum load current capacity.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Highest Compatibility (onsemi Variants): The 4N35SVM and 4N35SM from onsemi provide the closest electrical match to the 4N353S. Both maintain identical switching speed (2µs turn-on/off), Vce saturation (300mV), and output voltage specifications. The primary difference is reduced isolation voltage (4170Vrms vs. 5300Vrms) and narrower operating temperature range (-40°C to 100°C vs. -55°C to 100°C). These variants are active products with ROHS3 compliance and REACH unaffected status. Selection depends on whether the application isolation requirement can operate within 4170Vrms and the lower temperature minimum of -40°C.

Tier 2 - Isolation Voltage Match (Vishay Variants): The 4N35-X007, 4N35-X007T, 4N35-X009, and 4N35-X009T from Vishay Semiconductor Opto Division provide 5000Vrms isolation, closely matching the 4N353S rating. These variants maintain the full -55°C to 100°C operating range and ROHS3 compliance. The trade-off is slower switching speed (10µs turn-on/off vs. 2µs) and unspecified Vce saturation. Packaging variants include tube (4N35-X007, 4N35-X009) and tape & reel (4N35-X007T, 4N35-X009T) options. Selection between these variants depends on packaging requirements and tolerance for increased switching delay.

Tier 3 - Lower Isolation Voltage (Broadcom and Lite-On Variants): The 4N35-300E and 4N35-500E from Broadcom Limited, and 4N35S-TA and 4N35S-TA1 from Lite-On Inc. provide 3550Vrms isolation with 300mV Vce saturation matching. All maintain -55°C to 100°C operation and ROHS3 compliance. These variants are suitable only when application isolation requirements do not exceed 3550Vrms. Broadcom variants are available in tube (4N35-300E) and cut tape/digi-reel (4N35-500E) packaging. Lite-On variants are available in tape & reel (4N35S-TA) and cut tape/digi-reel (4N35S-TA1) packaging.

Compliance and Status: All substitute parts listed are active products with ROHS3 compliance and REACH unaffected or affected status. The 4N35S-TA1 from Lite-On is marked REACH affected, requiring verification against specific application requirements. All variants maintain moisture sensitivity level 1 (unlimited).

Frequently Asked Questions (FAQ)

Q: Can the 4N35SVM or 4N35SM replace the 4N353S directly?

A: The 4N35SVM and 4N35SM are functionally compatible substitutes with identical switching characteristics (2µs turn-on/off) and Vce saturation (300mV). The primary limitations are reduced isolation voltage (4170Vrms vs. 5300Vrms) and narrower operating temperature minimum (-40°C vs. -55°C). Direct replacement is possible if the application isolation requirement does not exceed 4170Vrms and minimum operating temperature is -40°C or higher.

Q: What is the difference between Vishay 4N35-X007 and 4N35-X009 variants?

A: Both Vishay variants provide identical electrical specifications: 5000Vrms isolation, 100% minimum current transfer ratio, 30V output voltage, and -55°C to 100°C operation. The difference is packaging: 4N35-X007 and 4N35-X007T are available in tube and tape & reel formats respectively, while 4N35-X009 and 4N35-X009T follow the same packaging pattern. Selection depends on procurement and assembly requirements.

Q: Why do Broadcom and Lite-On variants have lower isolation voltage?

A: The 4N35-300E, 4N35-500E, 4N35S-TA, and 4N35S-TA1 are rated for 3550Vrms isolation, which is lower than the 4N353S (5300Vrms) and Vishay variants (5000Vrms). These components are suitable for applications where isolation requirements do not exceed 3550Vrms. They maintain all other critical parameters including 100% current transfer ratio, 30V output voltage, and 300mV Vce saturation.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in multiple packaging formats: tube (standard reel), tape & reel (TR), and cut tape with digi-reel (CT). The 4N35SVM and 4N35SM are supplied in tube packaging. Vishay variants offer both tube and tape & reel options. Broadcom 4N35-500E and Lite-On 4N35S-TA1 are supplied in cut tape/digi-reel format, while 4N35-300E and 4N35S-TA are available in tube and tape & reel respectively. Packaging selection affects assembly compatibility and minimum order quantities.

Q: Are all substitutes ROHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance certification. The 4N353S original part does not specify RoHS status due to its obsolete classification. All active substitutes meet current RoHS3 requirements.

Q: What is the significance of REACH status differences?

A: Most substitutes are marked REACH unaffected, indicating no substances of very high concern (SVHC) are present. The 4N35S-TA1 from Lite-On is marked REACH affected, requiring verification against specific regulatory requirements in the application's target market. This designation does not prevent use but requires compliance confirmation.