FSFR1700US Equivalent & Substitute Parts

Part Overview

The FSFR1700US is an offline switching half-bridge power management IC manufactured by onsemi, designed for isolated converter applications with half-bridge topology. This component operates at switching frequencies up to 300kHz and delivers up to 200W of power output. The FSFR1700US carries an obsolete product status, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

FSFR1700US

onsemiIn Stock: 1431FSFR1700US Datasheet

Current PartRFQ

FSFR1700XS

Fairchild SemiconductorIn Stock: 1584FSFR1700XS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSFR1700US is determined by strict equivalence across the following critical parameters:

• Topology: Half-Bridge configuration
• Output Isolation: Isolated topology
• Voltage - Breakdown: 500V
• Voltage - Supply (Vcc/Vdd): 10V ~ 25V
• Voltage - Start Up: 12.5V
• Frequency - Switching: Up to 300kHz
• Power (Watts): 200W
• Duty Cycle: 50%
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control
• Operating Temperature: -40°C ~ 130°C (TJ)
• Package / Case: 10-SSIP Module, 9 Leads, Formed Leads
• Mounting Type: Through Hole

The FSFR1700XS meets all specified electrical and mechanical parameters, establishing direct substitution compatibility with the FSFR1700US.

Parameter Comparison

Engineering Selection Recommendations

The FSFR1700XS from Fairchild Semiconductor is a direct electrical and mechanical equivalent to the FSFR1700US. The primary distinction is product status: the FSFR1700US is obsolete, while the FSFR1700XS maintains active status, ensuring ongoing availability and supply chain continuity. Both components share identical electrical specifications, thermal operating ranges, and package configurations. Selection of the FSFR1700XS is appropriate for new designs and production continuity where the FSFR1700US is no longer available. Compliance certifications (ECCN: EAR99, HTSUS: 8542.39.0001) are consistent across both part numbers.

Frequently Asked Questions (FAQ)

Q: Can the FSFR1700XS directly replace the FSFR1700US in existing designs?

A: Yes. The FSFR1700XS meets all electrical and mechanical specifications of the FSFR1700US, including topology, voltage ratings, switching frequency, power output, fault protection, operating temperature range, and package configuration. No circuit modifications are required.

Q: What is the primary reason for substitution?

A: The FSFR1700US is obsolete. The FSFR1700XS is an active product with equivalent specifications, ensuring component availability for production and design continuity.

Q: Are the package configurations identical?

A: Yes. Both components use the 10-SSIP Module with 9 leads and formed leads, mounted through-hole. PCB layouts and mechanical footprints are compatible.

Q: Do both parts support the same operating temperature range?

A: Yes. Both the FSFR1700US and FSFR1700XS operate across -40°C to 130°C (TJ), meeting identical thermal requirements.

Q: Are there differences in fault protection capabilities?

A: No. Both components provide identical fault protection: current limiting, over-temperature protection, and over-voltage protection.

Q: What is the switching frequency capability of both parts?

A: Both components support switching frequencies up to 300kHz with 50% duty cycle operation in half-bridge topology.