4N28S-TA Equivalent & Substitute Parts

Part Overview

The 4N28S-TA 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 configuration with transistor output and integrated base connection, housed in a 6-SMD surface mount package. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent functional performance can be achieved within the specified electrical and mechanical parameters while maintaining compatibility with the 6-SMD Gull Wing package format.

Substiute Parts

4N28S-TA

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

Current PartRFQ

4N28SM

onsemiIn Stock: 28004N28SM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Package Compatibility: 6-SMD Gull Wing surface mount configuration
• Output Configuration: Transistor with Base output type
• Isolation Voltage: Minimum 500Vrms isolation rating
• Current Transfer Ratio: Minimum 10% @ 10mA
• Maximum Output Voltage: 30V capability
• Vce Saturation: Maximum 500mV
• RoHS Compliance: ROHS3 Compliant status
• Moisture Sensitivity: MSL 1 (Unlimited)

The 4N28SM from onsemi qualifies as a substitute part because it maintains compatibility across all critical mechanical and electrical parameters while offering enhanced isolation voltage (4170Vrms) and improved switching characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both the 4N28S-TA and 4N28SM maintain ROHS3 compliance and MSL 1 (Unlimited) ratings, qualifying them for equivalent applications. The 4N28SM provides higher isolation voltage (4170Vrms versus 500Vrms) and faster switching times (2µs turn-on/off versus 3µs), making it suitable for applications requiring enhanced isolation margins or improved transient response. The 4N28S-TA operates across a wider temperature range (-55°C to 100°C versus -40°C to 100°C), which may be required for extended low-temperature environments. Both parts share identical package geometry, output voltage rating, and saturation characteristics, ensuring direct mechanical and electrical compatibility in 6-SMD Gull Wing footprints.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts share identical package geometry (6-SMD Gull Wing), output type (Transistor with Base), maximum output voltage (30V), and Vce saturation rating (500mV). The 4N28SM meets or exceeds all critical electrical parameters of the 4N28S-TA.

Q: What is the primary difference between these parts?

A: The 4N28SM provides higher isolation voltage (4170Vrms versus 500Vrms) and faster switching characteristics (2µs versus 3µs). The 4N28S-TA supports a lower operating temperature limit (-55°C versus -40°C).

Q: Are both parts RoHS compliant?

A: Yes. Both the 4N28S-TA and 4N28SM are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings.

Q: What packaging format do these parts use?

A: Both parts are supplied in 6-SMD Gull Wing surface mount packages, ensuring identical PCB footprint compatibility.

Q: Does the higher isolation voltage of the 4N28SM affect circuit design?

A: No. The higher isolation voltage of the 4N28SM is a performance enhancement that does not require circuit modifications. It provides additional safety margin in high-voltage isolation applications.