FSD210B Equivalent & Substitute Parts

Part Overview

The FSD210B is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. This 7-DIP packaged component operates at 134kHz switching frequency with 7W power output capability and integrated current limiting, overload, and over-temperature protection. The FSD210B is classified as obsolete, making identification of functionally equivalent active alternatives essential for new designs and production continuity.

Substiute Parts

FSD210B

onsemiIn Stock: 938FSD210B Datasheet

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TNY274PN

Power IntegrationsIn Stock: 17480TNY274PN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSD210B is determined by the following critical parameters:

• Topology Match: Flyback converter architecture required for isolated power conversion
• Voltage Rating: 700V breakdown voltage for input transient protection
• Power Capability: Minimum 7W output power rating
• Switching Frequency: Operating range near 134kHz (132-136kHz acceptable)
• Duty Cycle: Operating range near 66% (65-67% acceptable)
• Package Compatibility: 8-DIP through-hole mounting with 7.62mm pitch
• Fault Protection: Current limiting and over-temperature protection as minimum requirements
• Supply Voltage Range: Compatible with 6.7V ~ 20V input specification

The TNY274PN from Power Integrations meets these substitution criteria as an active alternative with equivalent electrical performance and compatible packaging.

Parameter Comparison

Engineering Selection Recommendations

The TNY274PN is a direct functional equivalent for FSD210B replacement based on the following engineering criteria:

Electrical Equivalence: Both devices operate on identical flyback topology with 700V breakdown voltage, compatible switching frequencies (134kHz vs 132kHz), and duty cycles within 1% tolerance. The TNY274PN's 11W power rating exceeds the 7W requirement, providing design margin.

Package Compatibility: Both components use 8-DIP through-hole packaging with 0.300" (7.62mm) pitch, enabling direct PCB footprint compatibility without layout modification.

Protection Features: The TNY274PN incorporates all fault protection mechanisms of the FSD210B (current limiting, over-temperature) plus additional protections (over-voltage, short-circuit), enhancing system reliability.

Product Status and Compliance: The TNY274PN is active production status with RoHS compliance certification, addressing the obsolescence of the FSD210B while meeting modern regulatory requirements.

Operating Temperature Range: The TNY274PN's -40°C ~ 150°C range exceeds the FSD210B specification, supporting extended environmental applications.

Frequently Asked Questions (FAQ)

Q: Can TNY274PN directly replace FSD210B without PCB modifications?

A: Yes. Both devices use identical 8-DIP through-hole packaging with 7.62mm pitch. Pin-to-pin compatibility and electrical characteristics allow direct substitution without PCB layout changes.

Q: What are the key electrical differences between these parts?

A: Switching frequency differs by 2kHz (134kHz vs 132kHz), duty cycle by 1% (66% vs 65%), and power rating by 4W (7W vs 11W). These differences are within acceptable tolerance for flyback converter design and do not affect functional compatibility.

Q: Why is TNY274PN recommended over other alternatives?

A: The TNY274PN matches all critical substitution parameters: flyback topology, 700V breakdown voltage, compatible switching frequency and duty cycle, identical package, and through-hole mounting. It is the only substitute listed for the FSD210B.

Q: Does TNY274PN require firmware or software changes?

A: No. Both devices are analog integrated circuits without firmware. Substitution requires only component replacement on the PCB.

Q: Is TNY274PN available in higher volume than FSD210B?

A: Yes. TNY274PN inventory is 17,400 pieces versus 848 pieces for FSD210B, providing superior supply chain availability.

Q: What compliance certifications does TNY274PN carry?

A: TNY274PN is RoHS compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: Are there any thermal considerations when substituting?

A: TNY274PN operates to 150°C junction temperature versus 85°C ambient for FSD210B. Thermal design should account for the higher power capability (11W vs 7W) to prevent thermal runaway in confined spaces.