4N28S(TB)-V Equivalent & Substitute Parts

Part Overview

The 4N28S(TB)-V is an optoisolator transistor with base output manufactured by Everlight Electronics Co Ltd. This component provides galvanic isolation up to 5000Vrms with a single channel configuration in a 6-SMD surface mount package. The device is designed for applications requiring DC input signal isolation with transistor output capability including base access.

The 4N28S(TB)-V maintains Active product status and is ROHS3 compliant. Substitute parts are identified based on functional equivalence within the optoisolator transistor category, maintaining critical electrical parameters necessary for circuit-level compatibility.

Substiute Parts

4N28S(TB)-V

Everlight Electronics Co LtdIn Stock: 9694N28S(TB)-V Datasheet

Current PartRFQ

4N28SM

onsemiIn Stock: 28004N28SM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N28S(TB)-V are identified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Single channel optoisolator configuration
• Transistor output with base access
• DC input type
• 6-SMD surface mount package with gull wing leads
• Isolation voltage rating (minimum acceptable threshold)
• Current transfer ratio minimum of 10% @ 10mA
• Vce saturation maximum of 500mV
• Forward current maximum of 60mA
• ROHS3 compliance and Active product status

The 4N28SM from onsemi qualifies as a substitute part within this category. While isolation voltage differs (4170Vrms versus 5000Vrms), all other functional parameters remain within acceptable equivalence ranges for the optoisolator transistor category.

Parameter Comparison

Engineering Selection Recommendations

Both the 4N28S(TB)-V and 4N28SM are Active products with ROHS3 compliance. Selection between these parts depends on application-specific requirements:

4N28S(TB)-V Selection Criteria:

• Applications requiring 5000Vrms isolation voltage
• Circuits requiring maximum output voltage of 80V
• Operating temperature range extending to -55°C or above 100°C
• Packaging specified as Tube not required

4N28SM Selection Criteria:

• Applications where 4170Vrms isolation voltage is sufficient
• Circuits with maximum output voltage requirement of 30V or less
• Operating temperature range within -40°C to 100°C
• Tube packaging availability preferred
• Faster switching response (2µs versus 3µs) acceptable or beneficial

Both parts maintain identical current transfer ratio specifications, forward current ratings, and saturation voltage characteristics. Package footprint compatibility is confirmed for both 6-SMD gull wing configurations.

Frequently Asked Questions (FAQ)

Q: Can the 4N28SM directly replace the 4N28S(TB)-V in all applications?

A: Direct replacement is possible only when the application isolation voltage requirement does not exceed 4170Vrms and the maximum output voltage requirement does not exceed 30V. The 4N28SM operates within a narrower temperature range (-40°C to 100°C) compared to the 4N28S(TB)-V (-55°C to 110°C).

Q: What is the primary difference between these two parts?

A: The main differences are isolation voltage rating (5000Vrms versus 4170Vrms), maximum output voltage (80V versus 30V), operating temperature range, and switching speed. All other electrical parameters including current transfer ratio, forward current, and saturation voltage are identical.

Q: Are both parts compatible with the same PCB footprint?

A: Yes. Both parts use 6-SMD surface mount packages with gull wing leads, ensuring mechanical and electrical footprint compatibility.

Q: What is the significance of the Current Transfer Ratio specification?

A: The Current Transfer Ratio of 10% @ 10mA indicates the ratio of output collector current to input LED current. Both parts maintain this minimum specification, ensuring consistent optical coupling efficiency.

Q: Does the faster switching time of the 4N28SM affect circuit compatibility?

A: The 4N28SM switching time of 2µs (versus 3µs for the 4N28S(TB)-V) represents faster response. This is generally compatible with circuits designed for the 4N28S(TB)-V, as faster switching does not introduce incompatibility in standard isolation applications.

Q: Are both parts suitable for industrial temperature applications?

A: The 4N28S(TB)-V supports extended temperature range (-55°C to 110°C) suitable for industrial and automotive applications. The 4N28SM operates within -40°C to 100°C, which covers standard industrial temperature ranges but not extended military or automotive specifications.