Equivalent & Substitute Parts for 4N253SD Optoisolator

Part Overview

The 4N253SD 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 4N253SD serves as a single-channel optoisolator with DC input and transistor output with base connection, suitable for high-voltage isolation applications requiring fast switching response (2µs turn-on/turn-off time). Due to its obsolete status, active alternatives from multiple manufacturers are available to maintain design continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	4N253SD
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	20% @ 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)	500mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 4N253SD is determined by the following critical parameters:

Primary Compatibility Criteria:

Single-channel optoisolator configuration
DC input type
Transistor output with base connection
6-SMD, Gull Wing surface mount package
Isolation voltage rating (minimum 5000Vrms preferred for direct replacement)
Current transfer ratio minimum 20% @ 10mA
Operating temperature range -55°C to 100°C
Vce saturation maximum 500mV

Substitution Categories:

Direct Substitutes (Isolation ≥ 5000Vrms): Parts meeting or exceeding the 5300Vrms isolation specification with matching electrical characteristics and active product status.

Compatible Alternatives (Isolation 2500Vrms - 5000Vrms): Parts with lower isolation voltage ratings but identical package, pin configuration, and output characteristics. These are suitable for applications where the full 5300Vrms isolation margin is not required.

Functional Equivalents (Specialized Variants): Parts from alternative manufacturers with equivalent electrical performance and packaging, including different packaging formats (Tape & Reel vs. Tube).

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR (Min)	Turn On/Off Time	Vce Sat (Max)	Output Voltage (Max)	Forward Current (Max)	Operating Temp	Product Status	Packaging
4N253SD	onsemi	5300Vrms	20% @ 10mA	2µs, 2µs	500mV	30V	100 mA	-55°C ~ 100°C	Obsolete	6-SMD
4N25SR2VM	onsemi	4170Vrms	20% @ 10mA	2µs, 2µs	500mV	30V	60 mA	-40°C ~ 100°C	Active	6-SMD, Tape & Reel
4N25-300E	Broadcom Limited	2500Vrms	20% @ 10mA	—	500mV	30V	80 mA	-55°C ~ 100°C	Active	6-SMD, Tube
4N25-500E	Broadcom Limited	2500Vrms	20% @ 10mA	—	500mV	30V	80 mA	-55°C ~ 100°C	Active	6-SMD, Tape & Reel
4N25-X007T	Vishay Semiconductor Opto Division	5000Vrms	20% @ 10mA	—	500mV	70V	60 mA	-55°C ~ 100°C	Active	6-SMD, Tape & Reel
4N25-X009T	Vishay Semiconductor Opto Division	5000Vrms	20% @ 10mA	—	500mV	70V	60 mA	-55°C ~ 100°C	Active	6-SMD, Tape & Reel
4N25-X017	Vishay Semiconductor Opto Division	5000Vrms	20% @ 10mA	—	500mV	70V	60 mA	-55°C ~ 100°C	Active	6-SMD, Tube
4N25S	onsemi	5300Vrms	20% @ 10mA	2µs, 2µs	500mV	30V	100 mA	-55°C ~ 100°C	Obsolete	6-SMD
4N25S-TA	Lite-On Inc.	2500Vrms	20% @ 10mA	—	500mV	30V	80 mA	-55°C ~ 100°C	Active	6-SMD
4N25S-TA1	Lite-On Inc.	2500Vrms	20% @ 10mA	—	500mV	30V	80 mA	-55°C ~ 100°C	Active	6-SMD, Cut Tape & Digi-Reel
4N25SMT&R	Isocom Components 2004 LTD	7.5Vpk	20% @ 10mA	—	500mV	30V	60 mA	-55°C ~ 100°C	Active	6-SMD, Tape & Reel

Engineering Selection Recommendations

For Direct Replacement (Equivalent Isolation Performance):

The 4N25-X007T and 4N25-X009T from Vishay Semiconductor Opto Division provide the closest functional equivalence to the 4N253SD. Both maintain 5000Vrms isolation voltage (within 94% of the original specification), identical current transfer ratio, matching package configuration, and active product status. These parts are RoHS3 compliant and suitable for new designs requiring high-voltage isolation margins.

For Cost-Optimized Substitution (Reduced Isolation Requirement):

The 4N25S-TA1 from Lite-On Inc. offers an active alternative with 2500Vrms isolation voltage. This part is appropriate for applications where the full 5300Vrms isolation specification exceeds system requirements. The 4N25S-TA1 is RoHS3 compliant, available in Cut Tape & Digi-Reel packaging, and maintains identical output characteristics (30V maximum, 500mV Vce saturation).

For onsemi Platform Continuity:

The 4N25SR2VM from onsemi provides an active onsemi-manufactured alternative with 4170Vrms isolation voltage. This part maintains the same manufacturer ecosystem while offering reduced isolation voltage. It is RoHS3 compliant and available in Tape & Reel packaging.

Packaging Considerations:

Tape & Reel packaging is preferred for automated assembly and high-volume production
Tube packaging is suitable for manual assembly and lower-volume applications
All substitute parts maintain the 6-SMD, Gull Wing surface mount configuration

Compliance Status:

All recommended substitute parts carry REACH Unaffected status and RoHS3 compliance (where specified), ensuring regulatory alignment with the original 4N253SD design intent.

Frequently Asked Questions (FAQ)

Q: Can the 4N25-X009T directly replace the 4N253SD in existing designs?

A: Yes. The 4N25-X009T maintains 5000Vrms isolation voltage (94% of the original 5300Vrms specification), identical 6-SMD Gull Wing package, matching current transfer ratio (20% @ 10mA), and equivalent Vce saturation (500mV). The primary difference is higher maximum output voltage (70V vs. 30V), which does not restrict compatibility. Both parts operate across -55°C to 100°C.

Q: What is the key difference between 4N25-X007T and 4N25-X009T?

A: Both parts are functionally identical in electrical specifications (5000Vrms isolation, 20% CTR, 500mV Vce saturation). The primary difference is packaging format: 4N25-X007T is supplied in Tape & Reel, while 4N25-X009T is also available in Tape & Reel. Consult supplier availability for specific packaging requirements.

Q: Are the Broadcom 4N25-300E and 4N25-500E suitable substitutes?

A: These parts are compatible alternatives with reduced isolation voltage (2500Vrms vs. 5300Vrms). They maintain identical package configuration, current transfer ratio, and output characteristics. Selection depends on application isolation requirements. The 4N25-500E offers Tape & Reel packaging for automated assembly, while 4N25-300E is supplied in Tube format.

Q: What is the significance of the 4N25S variant?

A: The 4N25S is an onsemi part with identical electrical specifications to the 4N253SD (5300Vrms isolation, 2µs switching time, 100mA forward current). However, it is also classified as obsolete. For new designs, active alternatives such as 4N25SR2VM or Vishay parts are recommended.

Q: Does isolation voltage rating affect pin compatibility?

A: No. All substitute parts maintain identical 6-SMD Gull Wing pin configuration and DC input / transistor output with base connection. Isolation voltage rating is an internal device characteristic that does not affect mechanical or electrical interface compatibility.

Q: Which substitute offers the best thermal performance?

A: All substitute parts operate across the -55°C to 100°C range, matching the original 4N253SD specification. The 4N25SR2VM operates to -40°C minimum (vs. -55°C), which is acceptable for most industrial applications but represents a narrower temperature range.

Q: Are there RoHS compliance differences between substitutes?

A: Most active substitutes carry RoHS3 compliance certification. The 4N253SD and 4N25S (both obsolete) do not specify RoHS status. For new designs subject to RoHS requirements, select parts explicitly marked RoHS3 Compliant, such as 4N25-X009T, 4N25-X007T, 4N25S-TA1, or 4N25-300E.

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