FSFR2100US Equivalent & Substitute Parts

Part Overview

The FSFR2100US 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 integrates internal switches with comprehensive fault protection including current limiting, over-temperature, and over-voltage monitoring.

The FSFR2100US carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and production requirements.

Substiute Parts

FSFR2100US

onsemiIn Stock: 1823FSFR2100US Datasheet

Current PartRFQ

FSFR2100XS

onsemiIn Stock: 32784FSFR2100XS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSFR2100US is determined by strict alignment of the following critical parameters:

• Topology: Half-Bridge configuration
• Voltage - Breakdown: 500V minimum
• Voltage - Supply (Vcc/Vdd): 10V ~ 25V range
• Frequency - Switching: Up to 300kHz capability
• Power (Watts): 400W rating
• Duty Cycle: 50%
• Output Isolation: Isolated
• Internal Switch(s): Integrated switches required
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control
• Operating Temperature: -40°C ~ 130°C (TJ)
• Package / Case: 10-SIP or 10-SSIP Module, 9 Leads, Through Hole mounting

The FSFR2100XS qualifies as a direct substitute based on identical electrical specifications, topology, power rating, protection features, and thermal operating range. Both components share the same base product number (FSFR2100) and are manufactured by onsemi within the FSFR series.

Parameter Comparison

Engineering Selection Recommendations

The FSFR2100XS is the qualified substitute for the FSFR2100US. Both components are ROHS3 compliant and carry obsolete product status. The electrical and functional specifications are identical across all critical parameters including voltage ratings, switching frequency, power capacity, protection mechanisms, and thermal operating range.

The primary distinction between these parts is packaging designation (10-SSIP versus 10-SIP) and supplier device package classification. Both maintain through-hole mounting compatibility with 9 leads and formed leads configuration. The FSFR2100XS is available in tube packaging with significantly higher inventory levels (32,749 pieces) compared to the FSFR2100US (1,741 pieces).

For applications requiring the FSFR2100US, the FSFR2100XS provides direct functional equivalence with improved supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can the FSFR2100XS directly replace the FSFR2100US in existing designs?

A: Yes. The FSFR2100XS meets all electrical and functional specifications of the FSFR2100US. Both components share identical voltage ratings (500V breakdown, 10V-25V supply), switching frequency capability (up to 300kHz), power rating (400W), duty cycle (50%), protection features (current limiting, over-temperature, over-voltage), and operating temperature range (-40°C to 130°C). Through-hole mounting with 9 leads is maintained on both parts.

Q: What is the difference between the 10-SSIP and 10-SIP package designations?

A: Both designations refer to single in-line package modules with 9 leads and formed leads configuration. The electrical and mechanical compatibility for through-hole mounting applications is maintained. Consult component datasheets for specific package outline dimensions if PCB layout modifications are under consideration.

Q: Are both parts RoHS compliant?

A: Yes. Both the FSFR2100US and FSFR2100XS are ROHS3 compliant, meeting current environmental and material restriction standards.

Q: What is the product status of these components?

A: Both the FSFR2100US and FSFR2100XS carry obsolete product status. This designation indicates that onsemi no longer manufactures these components. Existing inventory from authorized distributors represents the available supply for new applications or legacy system support.

Q: How do the inventory levels compare?

A: The FSFR2100XS has substantially higher inventory availability (32,749 pieces) compared to the FSFR2100US (1,741 pieces). For procurement planning, the FSFR2100XS represents the more accessible option for current orders.