4N35S-TA Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N35S-TA is an optoisolator transistor with base output manufactured by Lite-On Inc., rated for 3550Vrms isolation voltage. This single-channel device features a 6-SMD surface mount package in Gull Wing configuration and is supplied in Tape & Reel packaging. The part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the allowed specification range, enabling direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value
Voltage - Isolation	3550Vrms
Number of Channels	1
Current Transfer Ratio (Min)	100% @ 10mA
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Current - Output / Channel	100mA
Vce Saturation (Max)	300mV
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 4N35S-TA are classified into two categories based on electrical parameter equivalence:

Category 1: Parametric Equivalents (3550Vrms Isolation) Parts maintaining identical isolation voltage (3550Vrms), output current (100mA), and operating temperature range (-55°C ~ 100°C). These parts are direct functional replacements with differences only in packaging format or manufacturer. Included parts: 4N35S-TA1, 4N35-300E, 4N35-500E, 4N35-560E.

Category 2: Manufacturer Recommended Alternatives (4170Vrms Isolation) Parts with elevated isolation voltage (4170Vrms) and faster switching characteristics (2µs turn-on/off time versus 3µs). These parts exceed the isolation specification of the main part and operate within a narrower temperature range (-40°C ~ 100°C). Included parts: 4N35SM, 4N35SR2M, 4N35SR2VM.

All substitute parts maintain: single-channel configuration, transistor with base output type, 30V maximum output voltage, 300mV Vce saturation, 1.2V typical forward voltage, 60mA maximum DC forward current, 6-SMD Gull Wing package, surface mount mounting, ROHS3 compliance, and MSL 1 rating.

Parameter Comparison

Part Number	Manufacturer	Voltage - Isolation	Current Transfer Ratio (Min)	Voltage - Output (Max)	Current - Output / Channel	Vce Saturation (Max)	Operating Temperature	Packaging	Product Status
4N35S-TA	Lite-On Inc.	3550Vrms	100% @ 10mA	30V	100mA	300mV	-55°C ~ 100°C	Tape & Reel (TR)	Active
4N35S-TA1	Lite-On Inc.	3550Vrms	100% @ 10mA	30V	100mA	300mV	-55°C ~ 100°C	Cut Tape (CT) & Digi-Reel®	Active
4N35-300E	Broadcom Limited	3550Vrms	100% @ 10mA	30V	100mA	300mV	-55°C ~ 100°C	Tube	Active
4N35-500E	Broadcom Limited	3550Vrms	100% @ 10mA	30V	100mA	300mV	-55°C ~ 100°C	Cut Tape (CT) & Digi-Reel®	Active
4N35-560E	Broadcom Limited	3550Vrms	100% @ 10mA	30V	100mA	300mV	-55°C ~ 100°C	Tape & Reel (TR)	Active
4N35SM	onsemi	4170Vrms	100% @ 10mA	30V	—	300mV	-40°C ~ 100°C	Tube	Active
4N35SR2M	onsemi	4170Vrms	100% @ 10mA	30V	—	300mV	-40°C ~ 100°C	Cut Tape (CT) & Digi-Reel®	Active
4N35SR2VM	onsemi	4170Vrms	100% @ 10mA	30V	—	300mV	-40°C ~ 100°C	Tape & Reel (TR)	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Specifications): Select 4N35S-TA1, 4N35-300E, 4N35-500E, or 4N35-560E when the circuit design requires 3550Vrms isolation voltage and 100mA output current with operating temperature range -55°C ~ 100°C. All four parts maintain identical electrical parameters and ROHS3 compliance. Packaging selection depends on procurement and assembly requirements: Tape & Reel for high-volume automated assembly, Cut Tape & Digi-Reel® for mixed-volume operations, or Tube for lower-volume manual assembly.

For Enhanced Isolation Performance: Select 4N35SM, 4N35SR2M, or 4N35SR2VM when circuit design permits operation within -40°C ~ 100°C temperature range and benefits from 4170Vrms isolation voltage. These onsemi parts provide 17% higher isolation rating and faster switching response (2µs versus 3µs). All three maintain ROHS3 compliance and 300mV Vce saturation. Packaging selection follows the same criteria as above.

Compliance Considerations: All substitute parts are ROHS3 compliant with MSL 1 rating. Broadcom parts carry REACH Unaffected status; onsemi parts carry REACH Unaffected status; Lite-On 4N35S-TA1 carries REACH Affected status. Verify REACH compliance requirements for your application before final selection.

Frequently Asked Questions (FAQ)

Q: Can 4N35-300E replace 4N35S-TA in my circuit? A: Yes. Both parts maintain 3550Vrms isolation voltage, 100% current transfer ratio at 10mA, 30V maximum output voltage, 100mA output current, 300mV Vce saturation, and -55°C ~ 100°C operating temperature. The difference is packaging: 4N35-300E is supplied in Tube format while 4N35S-TA is Tape & Reel. Electrical performance is identical.

Q: What is the difference between the Lite-On and Broadcom versions? A: The 4N35S-TA (Lite-On) and 4N35-300E/4N35-500E/4N35-560E (Broadcom) are parametric equivalents with identical electrical specifications. Differences exist only in manufacturer, packaging format, and inventory availability. All maintain the same isolation voltage, output characteristics, and temperature range.

Q: Can I use 4N35SR2M instead of 4N35S-TA? A: Substitution is possible with design considerations. The 4N35SR2M provides higher isolation voltage (4170Vrms versus 3550Vrms) and faster switching (2µs versus 3µs), but operates within a narrower temperature range (-40°C ~ 100°C versus -55°C ~ 100°C). If your circuit operates above -40°C and does not require the extended low-temperature capability, 4N35SR2M is a suitable upgrade. Verify that your application does not require operation below -40°C.

Q: What packaging options are available for equivalent parts? A: Equivalent 3550Vrms parts are available in three packaging formats: Tape & Reel (4N35S-TA, 4N35-560E) for high-volume automated assembly, Cut Tape & Digi-Reel® (4N35S-TA1, 4N35-500E) for mixed-volume operations, and Tube (4N35-300E) for lower-volume manual assembly. Select based on your production volume and assembly process requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the main part specification.

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