4N283SD Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N283SD 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 new designs and ongoing production support. The 4N283SD serves applications requiring galvanic isolation with transistor output capability and moderate current transfer ratios.

Substiute Parts

4N283SD

onsemiIn Stock: 11014N283SD Datasheet

Current PartRFQ

4N28SR2VM

onsemiIn Stock: 12994N28SR2VM Datasheet

DirectRFQ

4N28-X009T

Vishay Semiconductor Opto DivisionIn Stock: 126414N28-X009T Datasheet

SimilarRFQ

4N28S

onsemiIn Stock: 61384N28S Datasheet

SimilarRFQ

4N28S-TA

Lite-On Inc.In Stock: 10624N28S-TA Datasheet

SimilarRFQ

4N28S-TA1

Lite-On Inc.In Stock: 9114N28S-TA1 Datasheet

SimilarRFQ

4N28SM

onsemiIn Stock: 28004N28SM Datasheet

SimilarRFQ

4N28SMT&R

Isocom Components 2004 LTDIn Stock: 11214N28SMT&R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 4N283SD is determined by the following critical parameters:

• Isolation Voltage: Minimum 5000Vrms to maintain equivalent isolation performance
• Output Type: Transistor with Base configuration required
• Package: 6-SMD, Gull Wing surface mount form factor
• Current Transfer Ratio: Minimum 10% @ 10mA
• Vce Saturation: Maximum 500mV
• Operating Temperature Range: Support for -55°C minimum operation
• Input Type: DC input requirement

Substitute parts are grouped into two categories:

Direct Substitutes (Equivalent isolation voltage and performance):

• 4N28SR2VM (onsemi) - 4170Vrms isolation, active product status
• 4N28-X009T (Vishay) - 5000Vrms isolation, active product status
• 4N28S (onsemi) - 5300Vrms isolation, obsolete product status

Functional Alternatives (Lower isolation voltage, different performance characteristics):

• 4N28S-TA (Lite-On) - 500Vrms isolation, active product status
• 4N28S-TA1 (Lite-On) - 500Vrms isolation, active product status
• 4N28SM (onsemi) - 4170Vrms isolation, active product status
• 4N28SMT&R (Isocom) - 7.5Vpk isolation, active product status

Parameter Comparison

Engineering Selection Recommendations

For applications requiring equivalent isolation voltage (5000Vrms or higher):

The 4N28-X009T (Vishay) is the primary recommendation. It maintains 5000Vrms isolation voltage, supports the full -55°C to 100°C operating temperature range, and holds active product status with ROHS3 compliance. The higher maximum output voltage (70V versus 30V) provides additional design margin for isolation-critical applications.

The 4N28SR2VM (onsemi) offers an alternative with 4170Vrms isolation and active product status. It maintains compatibility with the 6-SMD package and supports the -40°C to 100°C temperature range, though the minimum operating temperature is 15°C higher than the original part.

For applications with reduced isolation voltage requirements (below 5000Vrms):

The 4N28SM (onsemi) and 4N28SR2VM both provide 4170Vrms isolation with active product status and ROHS3 compliance. These parts are suitable for applications where the lower isolation voltage meets system requirements.

The 4N28S-TA and 4N28S-TA1 (Lite-On) are active products with ROHS3 compliance but operate at 500Vrms isolation voltage. These parts are appropriate only for low-voltage isolation applications and represent a significant reduction in isolation capability.

Avoid obsolete alternatives:

The 4N28S (onsemi) shares identical electrical specifications with the 4N283SD but carries obsolete product status, making it unsuitable for new designs or long-term production support.

Frequently Asked Questions (FAQ)

Q: Can the 4N28SR2VM directly replace the 4N283SD?

A: The 4N28SR2VM is electrically compatible for most parameters but operates at 4170Vrms isolation versus the 4N283SD's 5300Vrms. It is suitable only if your application isolation voltage requirement is 4170Vrms or lower. The operating temperature range is also narrower (-40°C to 100°C versus -55°C to 100°C).

Q: What is the key difference between 4N28-X009T and 4N28SR2VM?

A: The 4N28-X009T (Vishay) maintains 5000Vrms isolation and supports -55°C minimum operating temperature, matching the original 4N283SD's temperature range. The 4N28SR2VM (onsemi) provides 4170Vrms isolation with -40°C minimum temperature. Choose 4N28-X009T for applications requiring the full temperature range and higher isolation voltage.

Q: Are the Lite-On parts (4N28S-TA, 4N28S-TA1) suitable replacements?

A: These parts are not suitable direct replacements. They operate at 500Vrms isolation, which is approximately 10 times lower than the 4N283SD. Use these parts only if your application requires 500Vrms isolation or lower.

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

A: Both parts are manufactured by Lite-On with identical electrical specifications. The primary difference is packaging: 4N28S-TA is supplied in standard packaging, while 4N28S-TA1 is supplied in Tape & Reel (TR) format for automated assembly.

Q: Does the 4N28SMT&R meet the isolation voltage requirement?

A: No. The 4N28SMT&R (Isocom) is rated for 7.5Vpk isolation, which is significantly lower than the 4N283SD's 5300Vrms. This part is not suitable for applications requiring high-voltage isolation.

Q: Are all substitute parts ROHS3 compliant?

A: The active substitute parts (4N28SR2VM, 4N28-X009T, 4N28S-TA, 4N28S-TA1, 4N28SM, 4N28SMT&R) are all ROHS3 compliant. The 4N28S (obsolete) does not list RoHS status.

Q: Can I use a lower isolation voltage part if my circuit only requires partial isolation?

A: Isolation voltage selection must be based on system-level safety and regulatory requirements, not circuit-level requirements alone. Consult your system design specifications and applicable safety standards before selecting a substitute with lower isolation voltage.