4N283S Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N283S is a single-channel optoisolator with transistor output and base connection, manufactured by onsemi. It provides 5300Vrms isolation voltage in a 6-SMD surface mount package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across isolation voltage, output characteristics, package form factor, and thermal operating range.

Key Parameters

Parameter	4N283S
Manufacturer	onsemi
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	10% @ 10mA
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 4N283S is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms to maintain electrical isolation requirements
Output Configuration: Transistor with base output only
Package Form Factor: 6-SMD, Gull Wing surface mount
Input Type: DC input
Number of Channels: Single channel
Operating Temperature Range: Must support -55°C to 100°C minimum
Vce Saturation: Maximum 500mV
Current Transfer Ratio: Minimum 10% @ 10mA

Based on these criteria, the following parts qualify as direct substitutes:

Tier 1 - Full Electrical Equivalents (5000Vrms and above):

4N28-X009T (Vishay, 5000Vrms, Active)
4N28S (onsemi, 5300Vrms, Obsolete)
4N28SM (onsemi, 4170Vrms, Active)

Tier 2 - Reduced Isolation Voltage (Below 5000Vrms):

4N28S-TA (Lite-On, 500Vrms, Active)
4N28S-TA1 (Lite-On, 500Vrms, Active)
4N28SMT&R (Isocom, 7.5Vpk, Active)

Parameter Comparison

Parameter	4N283S	4N28-X009T	4N28S	4N28SM	4N28S-TA	4N28S-TA1	4N28SMT&R
Manufacturer	onsemi	Vishay	onsemi	onsemi	Lite-On	Lite-On	Isocom
Product Status	Obsolete	Active	Obsolete	Active	Active	Active	Active
Voltage - Isolation	5300Vrms	5000Vrms	5300Vrms	4170Vrms	500Vrms	500Vrms	7.5Vpk
Current Transfer Ratio (Min)	10% @ 10mA	10% @ 10mA	10% @ 10mA	10% @ 10mA	10% @ 10mA	10% @ 10mA	10% @ 10mA
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	30V	70V	30V	30V	30V	30V	30V
Voltage - Forward (Vf) (Typ)	1.18V	1.36V	1.18V	1.18V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	100 mA	60 mA	100 mA	60 mA	80 mA	80 mA	60 mA
Vce Saturation (Max)	500mV	500mV	500mV	500mV	500mV	500mV	500mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring 5000Vrms isolation or higher:

The 4N28-X009T (Vishay) is the primary recommended substitute. It maintains 5000Vrms isolation, meets all electrical parameter requirements, carries Active product status, and includes ROHS3 compliance certification. The 4N28SM (onsemi) provides an alternative with 4170Vrms isolation and Active status, suitable for applications where isolation voltage can be reduced below the original 5300Vrms specification.

For applications with reduced isolation voltage requirements:

The 4N28S-TA and 4N28S-TA1 (Lite-On) are suitable only for circuits requiring 500Vrms isolation or less. Both parts are Active and ROHS3 compliant. The 4N28S-TA1 includes Tape & Reel packaging for automated assembly.

For legacy design continuity:

The 4N28S (onsemi) provides electrical equivalence to the 4N283S but shares Obsolete status. This part should not be selected for new designs.

Packaging and compliance considerations:

All substitute parts maintain 6-SMD Gull Wing surface mount compatibility. Parts with Tape & Reel packaging (4N28-X009T, 4N28S-TA1, 4N28SMT&R) are optimized for high-volume automated assembly. ROHS3 compliance is available across all active substitutes except where not specified.

Frequently Asked Questions (FAQ)

Q: Can the 4N28-X009T directly replace the 4N283S?

A: Yes. The 4N28-X009T meets all critical substitution criteria: 5000Vrms isolation (exceeds 5300Vrms requirement), identical transistor output configuration, matching 6-SMD Gull Wing package, and equivalent electrical parameters. It is Active status and ROHS3 compliant.

Q: What is the minimum isolation voltage acceptable for substitution?

A: The 4N283S specifies 5300Vrms isolation. Substitutes with 5000Vrms or higher (4N28-X009T, 4N28S, 4N28SM) maintain this specification. Parts with lower isolation voltage (4N28S-TA, 4N28S-TA1 at 500Vrms, 4N28SMT&R at 7.5Vpk) are suitable only if circuit design permits reduced isolation requirements.

Q: Are all substitutes available in Tape & Reel packaging?

A: No. Tape & Reel packaging is available for 4N28-X009T, 4N28S-TA1, and 4N28SMT&R. The 4N283S, 4N28S, 4N28S-TA, and 4N28SM are supplied in alternative packaging formats.

Q: Does the 4N28SM meet the operating temperature range of the 4N283S?

A: The 4N28SM operates from -40°C to 100°C, which does not extend to the -55°C lower limit of the 4N283S. Applications requiring -55°C operation must select 4N28-X009T, 4N28S, 4N28S-TA, 4N28S-TA1, or 4N28SMT&R.

Q: What is the difference between 4N28S-TA and 4N28S-TA1?

A: Both parts are electrically identical with 500Vrms isolation. The primary difference is packaging: 4N28S-TA uses standard tube packaging, while 4N28S-TA1 is supplied in Tape & Reel format for automated assembly processes.

Q: Are all substitutes ROHS3 compliant?

A: ROHS3 compliance is confirmed for 4N28-X009T, 4N28SM, 4N28S-TA, 4N28S-TA1, and 4N28SMT&R. The 4N283S and 4N28S do not specify RoHS status in available documentation.

Q: Can the 4N28-X009T handle higher output voltage than the 4N283S?

A: Yes. The 4N28-X009T supports 70V maximum output voltage compared to

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