4N353SD Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N353SD is a 6-SMD surface mount optoisolator transistor with base output manufactured by onsemi, rated for 5300Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 4N353SD serves as a single-channel DC input optoisolator with transistor output configuration, suitable for high-voltage isolation applications requiring galvanic separation.

Key Parameters

Parameter	4N353SD
Manufacturer	onsemi
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	100% @ 10mA
Turn On / Turn Off Time (Typ)	2µs, 2µs
Input Type	DC
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Voltage - Forward (Vf) (Typ)	1.18V
Current - DC Forward (If) (Max)	100 mA
Vce Saturation (Max)	300mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 4N353SD is determined by the following critical parameters:

Isolation Voltage: Minimum 5300Vrms or equivalent rating
Output Configuration: Transistor with Base output type
Package Type: 6-SMD, Gull Wing surface mount
Input Type: DC input
Number of Channels: Single channel (1)
Current Transfer Ratio: Minimum 100% @ 10mA
Operating Temperature Range: Must support -55°C to 100°C or equivalent
Mounting Type: Surface mount only

Substitute parts are grouped into two categories based on isolation voltage performance:

Category A - High Isolation (5000Vrms and above): Parts maintaining isolation voltage at or above the 4N353SD specification, suitable for direct replacement in applications requiring maximum isolation margin.

Category B - Reduced Isolation (3550Vrms to 4170Vrms): Parts with lower isolation voltage ratings, suitable only for applications where the lower isolation specification is acceptable within system design margins.

Parameter Comparison

Part Number	Manufacturer	Product Status	Isolation Voltage	CTR (Min)	Turn On/Off Time	Output Type	Vce Sat (Max)	If (Max)	Operating Temp	Package
4N353SD	onsemi	Obsolete	5300Vrms	100% @ 10mA	2µs, 2µs	Transistor w/ Base	300mV	100mA	-55°C ~ 100°C	6-SMD, Gull Wing
4N35SR2VM	onsemi	Active	4170Vrms	100% @ 10mA	2µs, 2µs	Transistor w/ Base	300mV	60mA	-40°C ~ 100°C	6-SMD, Gull Wing
4N35-300E	Broadcom Limited	Active	3550Vrms	100% @ 10mA	—	Transistor w/ Base	300mV	60mA	-55°C ~ 100°C	6-SMD, Gull Wing
4N35-500E	Broadcom Limited	Active	3550Vrms	100% @ 10mA	—	Transistor w/ Base	300mV	60mA	-55°C ~ 100°C	6-SMD, Gull Wing
4N35-X007	Vishay Semiconductor Opto Division	Active	5000Vrms	100% @ 10mA	10µs, 10µs	Transistor w/ Base	—	60mA	-55°C ~ 100°C	6-SMD, Gull Wing
4N35-X007T	Vishay Semiconductor Opto Division	Active	5000Vrms	100% @ 10mA	10µs, 10µs	Transistor w/ Base	—	60mA	-55°C ~ 100°C	6-SMD, Gull Wing
4N35-X009	Vishay Semiconductor Opto Division	Active	5000Vrms	100% @ 10mA	10µs, 10µs	Transistor w/ Base	—	60mA	-55°C ~ 100°C	6-SMD, Gull Wing
4N35-X009T	Vishay Semiconductor Opto Division	Active	5000Vrms	100% @ 10mA	10µs, 10µs	Transistor w/ Base	—	60mA	-55°C ~ 100°C	6-SMD, Gull Wing
4N35S-TA	Lite-On Inc.	Active	3550Vrms	100% @ 10mA	—	Transistor w/ Base	300mV	60mA	-55°C ~ 100°C	6-SMD, Gull Wing
4N35S-TA1	Lite-On Inc.	Active	3550Vrms	100% @ 10mA	—	Transistor w/ Base	300mV	60mA	-55°C ~ 100°C	6-SMD, Gull Wing
4N35SM	onsemi	Active	4170Vrms	100% @ 10mA	2µs, 2µs	Transistor w/ Base	300mV	60mA	-40°C ~ 100°C	6-SMD, Gull Wing

Engineering Selection Recommendations

Primary Substitutes (High Isolation Category)

The 4N35-X007, 4N35-X007T, 4N35-X009, and 4N35-X009T from Vishay Semiconductor Opto Division maintain 5000Vrms isolation voltage, providing the closest electrical equivalence to the 4N353SD. All four parts are active products with RoHS3 compliance and REACH unaffected status. The primary trade-off is increased turn-on/turn-off time (10µs versus 2µs) and reduced maximum forward current (60mA versus 100mA). The -X007T and -X009T variants are supplied in Tape & Reel packaging, while -X007 and -X009 are supplied in Tube packaging.

Secondary Substitutes (onsemi Active Products)

The 4N35SR2VM and 4N35SM from onsemi provide active product status with identical turn-on/turn-off timing (2µs) and Vce saturation characteristics (300mV) to the 4N353SD. Both operate at 4170Vrms isolation voltage with reduced maximum forward current (60mA). The 4N35SR2VM is supplied in Tape & Reel packaging, while 4N35SM is supplied in Tube packaging. Operating temperature range is -40°C to 100°C, which does not extend to -55°C.

Tertiary Substitutes (Reduced Isolation Category)

The 4N35-300E and 4N35-500E from Broadcom Limited, along with 4N35S-TA and 4N35S-TA1 from Lite-On Inc., operate at 3550Vrms isolation voltage. These parts are suitable only for applications where the reduced isolation specification is acceptable. All maintain 100% CTR @ 10mA and 300mV Vce saturation. The Broadcom parts support -55°C to 100°C operating temperature, while Lite-On parts also support this range. The 4N35S-TA1 is supplied in Cut Tape & Digi-Reel packaging with REACH Affected status.

Frequently Asked Questions (FAQ)

Q: Can the 4N35-X009 directly replace the 4N353SD?

A: The 4N35-X009 is electrically compatible in terms of isolation voltage (5000Vrms), output configuration, and current transfer ratio. However, the turn-on/turn-off time is 10µs compared to 2µs for the 4N353SD, and maximum forward current is reduced from 100mA to 60mA. Applications with timing-critical requirements or high input current demands must evaluate these differences.

Q: What is the difference between 4N35-X009 and 4N35-X009T?

A: Both parts are identical electrically. The primary difference is packaging: 4N35-X009 is supplied in Tube packaging, while 4N35-X009T is supplied in Tape & Reel (TR) packaging. Selection depends on assembly process requirements and volume considerations.

Q: Why is the 4N35SR2VM rated for only -40°C minimum operating temperature?

A: The 4N35SR2VM is specified with a -40°C to 100°C operating temperature range, which does not extend to the -55°C minimum of the 4N353SD. Applications requiring operation below -40°C must select alternatives such as the Vishay 4N35-X007 series or Broadcom 4N35-300E/500E, which support -55°C operation.

Q: Are all substitute parts RoHS compliant?

A: The Vishay 4N35-X007, 4N35-X007T, 4N35-X009, and 4N35-X009T are RoHS3 compliant. The onsemi 4N35SR2VM and 4N35SM are RoHS3 compliant. The Broadcom 4N35-300E and 4N35-500E are RoHS3 compliant. The Lite-On 4N35S-TA is RoHS3 compliant, while 4N35S-TA1 is RoHS3 compliant with REACH Affected status.

Q: What is the significance of the isolation voltage difference between 5300Vrms and 5000Vrms?

A: The 4N353SD provides 5300Vrms isolation, while Vishay alternatives provide 5000Vrms. This 300Vrms difference represents approximately 5.7% lower isolation margin. Applications with system-level isolation requirements at or above 5300Vrms must account for this reduction in design margin or select parts with higher isolation ratings.

Q: Can I use a 3550Vrms part in place of the 4N353SD?

A: Parts rated at 3550Vrms (Broadcom 4N35-300E, 4N35-500E, and Lite-On 4N35S-TA, 4N35S-TA1) can be used only if the application design permits operation at this lower isolation voltage. This represents a 33% reduction from the 4N353SD specification and must be evaluated against system-level isolation requirements and safety margins.

Q: What packaging options are available for high-isolation substitutes?

A: The Vishay 4N35-X007T and 4N35-X009T are supplied in Tape & Reel packaging for automated assembly. The 4N35-X007 and 4N35-X009 are supplied in Tube packaging. The onsemi 4N35SR2VM is supplied in Tape & Reel packaging, while 4N35SM is supplied in Tube packaging.

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