4N28S-TA1 Equivalent & Substitute Parts

Part Overview

The 4N28S-TA1 is an optoisolator transistor with base output manufactured by Lite-On Inc., designed for galvanic isolation applications requiring 500Vrms isolation voltage. This component features a single channel with transistor output and integrated base connection, housed in a 6-SMD surface mount package. The part is currently active in production and ROHS3 compliant. Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameter ranges for optoisolator transistor configurations.

Substiute Parts

4N28S-TA1

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

Current PartRFQ

4N28SM

onsemiIn Stock: 28004N28SM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 4N28S-TA1 is determined by the following critical parameters:

Number of Channels: Must equal 1 channel Output Type: Must be Transistor with Base Mounting Type: Must be Surface Mount Package / Case: Must be 6-SMD, Gull Wing configuration Input Type: Must be DC Vce Saturation (Max): Must not exceed 500mV Current Transfer Ratio (Min): Must meet or exceed 10% @ 10mA Voltage - Output (Max): Must be 30V or greater RoHS Status: Must be ROHS3 Compliant

The 4N28SM from onsemi qualifies as a substitute part based on these parameters. While the 4N28SM provides higher isolation voltage (4170Vrms versus 500Vrms), this represents an enhanced specification that does not prevent substitution in applications designed for the 4N28S-TA1. The substitute maintains identical channel count, output type, package configuration, and saturation characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both the 4N28S-TA1 and 4N28SM are active production components with ROHS3 compliance. The 4N28SM is suitable for applications currently specified for the 4N28S-TA1 where the enhanced isolation voltage specification (4170Vrms) does not create design conflicts. The lower operating temperature minimum of the 4N28SM (-40°C versus -55°C) should be evaluated against application requirements. Both components maintain identical electrical performance characteristics for current transfer ratio, output voltage, and saturation voltage. Packaging and mounting configurations are identical, enabling direct physical substitution in 6-SMD surface mount layouts.

Frequently Asked Questions (FAQ)

Q: Can the 4N28SM replace the 4N28S-TA1 in existing designs?

A: Yes, the 4N28SM qualifies as a substitute based on matching channel count, output type, package configuration, and key electrical parameters. The higher isolation voltage of the 4N28SM does not prevent substitution in applications designed for 500Vrms isolation.

Q: What is the primary difference between these parts?

A: The 4N28SM provides 4170Vrms isolation voltage compared to the 4N28S-TA1's 500Vrms specification. Both parts maintain identical current transfer ratio, output voltage, and saturation characteristics.

Q: Are there temperature range considerations for substitution?

A: The 4N28SM operates from -40°C to 100°C, while the 4N28S-TA1 operates from -55°C to 100°C. Applications requiring operation below -40°C must use the 4N28S-TA1.

Q: Do these parts use the same package?

A: Yes, both components use 6-SMD, Gull Wing surface mount packages with identical pin configurations, enabling direct board-level substitution.

Q: Are both parts RoHS compliant?

A: Yes, both the 4N28S-TA1 and 4N28SM are ROHS3 compliant.