FSFR2100USL Equivalent & Substitute Parts

Part Overview

The FSFR2100USL is an offline switching half-bridge power management IC manufactured by onsemi, designed for isolated converter applications with up to 300kHz switching frequency and 400W power handling capability. This component operates with a 500V breakdown voltage and includes integrated fault protection features including current limiting, over-temperature, and over-voltage protection.

The FSFR2100USL carries an obsolete product status. Identifying equivalent and substitute parts is necessary for design continuity, procurement flexibility, and long-term system reliability when original inventory becomes unavailable.

Substiute Parts

FSFR2100USL

onsemiIn Stock: 2138FSFR2100USL Datasheet

Current PartRFQ

FSFR2100XS

onsemiIn Stock: 32784FSFR2100XS Datasheet

SimilarRFQ

FSFR2100XSL

onsemiIn Stock: 1219FSFR2100XSL Datasheet

SimilarRFQ

FSFR1700XS

Fairchild SemiconductorIn Stock: 1584FSFR1700XS Datasheet

Parametric EquivalentRFQ

FSFR1700XSL

Fairchild SemiconductorIn Stock: 16531FSFR1700XSL Datasheet

Parametric EquivalentRFQ

FSFR1800XS

onsemiIn Stock: 6489FSFR1800XS Datasheet

Parametric EquivalentRFQ

FSFR1800XSL

Fairchild SemiconductorIn Stock: 2665FSFR1800XSL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSFR2100USL is determined by the following critical parameters:

Mandatory Matching Parameters:

• Topology: Half-Bridge
• Voltage - Breakdown: 500V
• Voltage - Supply (Vcc/Vdd): 10V ~ 25V
• Duty Cycle: 50%
• Frequency - Switching: Up to 300kHz
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control
• Operating Temperature: -40°C ~ 130°C (TJ)
• Package / Case: 10-SIP Module, 9 Leads, Formed Leads
• Mounting Type: Through Hole
• Output Isolation: Isolated
• Internal Switch(s): Yes

Allowable Variation:

• Power (Watts): Substitute parts may have equal or greater power rating
• Packaging format: Tube or unspecified packaging acceptable
• Product Status: Active or Obsolete acceptable
• Compliance certifications: RoHS3 Compliant or REACH Unaffected acceptable

Substitute parts are grouped into two categories: direct substitutes (identical electrical and mechanical specifications) and parametric equivalents (matching all critical parameters with power rating variations).

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Identical Specifications):

FSFR2100XS and FSFR2100XSL are direct electrical and mechanical equivalents to the FSFR2100USL. Both maintain the 400W power rating and all critical electrical parameters. FSFR2100XS is packaged in Tube format with obsolete status. FSFR2100XSL features formed leads (L designation) and obsolete status. Both are manufactured by onsemi and carry RoHS3 compliance.

Parametric Equivalents (Lower Power Rating):

FSFR1800XS and FSFR1800XSL are parametric equivalents with reduced power rating of 260W. FSFR1800XS is manufactured by onsemi with obsolete status and Tube packaging. FSFR1800XSL is manufactured by Fairchild Semiconductor with active product status.

FSFR1700XS and FSFR1700XSL are parametric equivalents with the lowest power rating of 200W. Both are manufactured by Fairchild Semiconductor with active product status. FSFR1700XS uses standard 9-SIP packaging. FSFR1700XSL features formed leads (L designation).

Compliance and Availability Considerations:

For applications requiring active product status and long-term availability, FSFR1700XSL and FSFR1700XS from Fairchild Semiconductor are preferred. Both carry active product status and are currently in stock with substantial inventory (16,488 and 1,529 units respectively).

For applications requiring the full 400W power rating, FSFR2100XS and FSFR2100XSL maintain identical electrical specifications. FSFR2100XSL with formed leads provides mechanical compatibility with the original FSFR2100USL design.

Frequently Asked Questions (FAQ)

Q: Can FSFR1700XS or FSFR1700XSL be used in place of FSFR2100USL?

A: FSFR1700XS and FSFR1700XSL are parametric equivalents with identical electrical characteristics and package compatibility. The primary difference is reduced power rating (200W versus 400W). These parts are suitable for applications where the actual power requirement does not exceed 200W. Both are manufactured by Fairchild Semiconductor and carry active product status.

Q: What is the difference between parts with "XS" and "XSL" designations?

A: The "L" suffix indicates formed leads. FSFR2100XSL and FSFR1700XSL feature formed leads, while FSFR2100XS and FSFR1700XS use standard leads. Both configurations are through-hole mounted and electrically equivalent. Lead formation affects mechanical fit in specific PCB designs.

Q: Are there compliance differences between onsemi and Fairchild Semiconductor versions?

A: onsemi versions (FSFR2100XS, FSFR2100XSL, FSFR1800XS) carry RoHS3 compliance. Fairchild Semiconductor versions (FSFR1700XS, FSFR1700XSL, FSFR1800XSL) have not specified RoHS status in the provided data. All parts carry REACH Unaffected status and EAR99 ECCN classification.

Q: Which substitute part offers the best long-term availability?

A: FSFR1700XSL offers the best long-term availability with active product status and 16,488 units in current inventory. FSFR1700XS also maintains active status with 1,529 units available. Both Fairchild Semiconductor parts are suitable for new designs requiring extended product lifecycle support.

Q: Can FSFR1800XS be used as a substitute?

A: FSFR1800XS is a parametric equivalent with 260W power rating, intermediate between the 200W FSFR1700 series and 400W FSFR2100 series. It is suitable for applications requiring 200W to 260W power handling. FSFR1800XS carries obsolete product status with 6,418 units in inventory.