FSFR1700L Equivalent & Substitute Parts

Part Overview

The FSFR1700L is an offline switching half-bridge power management IC manufactured by onsemi, designed for isolated converter applications with half-bridge topology operating up to 300kHz. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The FSFR1700L delivers 200W power handling with integrated fault protection including current limiting, overload, overvoltage, and overtemperature monitoring.

Substiute Parts

FSFR1700L

onsemiIn Stock: 19835FSFR1700L Datasheet

Current PartRFQ

FSFR1700XSL

Fairchild SemiconductorIn Stock: 16531FSFR1700XSL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSFR1700L is determined by strict alignment across the following critical parameters:

Topology and isolation architecture must remain half-bridge with isolated output configuration. Voltage ratings must support the 500V breakdown specification and accommodate the supply voltage range of 11.3V to 25V minimum. Switching frequency capability must reach 300kHz or higher. Power handling must equal or exceed 200W. Fault protection must include current limiting, overtemperature, and overvoltage protection as minimum requirements. Package configuration must be 10-SIP Module with 9 leads and formed leads for through-hole mounting compatibility. Operating temperature range must span -40°C to 130°C (TJ).

The FSFR1700XSL meets these substitution criteria across all critical parameters while offering active product status, providing continuity for applications currently using the obsolete FSFR1700L.

Parameter Comparison

Engineering Selection Recommendations

The FSFR1700XSL is the qualified substitute for the obsolete FSFR1700L. Both components share identical topology, package configuration, and core electrical specifications. The FSFR1700XSL offers the advantage of active product status, ensuring continued availability and manufacturing support. Supply voltage range on the FSFR1700XSL extends to 10V minimum compared to 11.3V on the FSFR1700L, providing broader input voltage compatibility. Startup voltage is lower on the FSFR1700XSL at 12.5V versus 14.5V, enabling operation in lower supply voltage conditions. Both components maintain identical export compliance classifications (EAR99) and tariff codes (8542.39.0001).

Frequently Asked Questions (FAQ)

Q: Can the FSFR1700XSL directly replace the FSFR1700L in existing designs?

A: Yes. Both components feature identical 10-SIP package configuration with 9 formed leads for through-hole mounting, matching topology, and equivalent electrical specifications across all critical parameters including 500V breakdown voltage, 200W power handling, 300kHz switching frequency, and -40°C to 130°C operating temperature range.

Q: What are the key differences between these parts?

A: The FSFR1700XSL is manufactured by Fairchild Semiconductor with active product status, while the FSFR1700L is an obsolete onsemi component. The FSFR1700XSL provides lower minimum supply voltage (10V vs 11.3V) and lower startup voltage (12.5V vs 14.5V), offering improved low-voltage operation capability.

Q: Are there any fault protection differences?

A: The FSFR1700L includes current limiting, overload, overvoltage, and overtemperature protection. The FSFR1700XSL includes current limiting, overvoltage, and overtemperature protection. Both provide essential fault protection for isolated half-bridge converter applications.

Q: What mounting considerations apply to substitution?

A: Both components use identical 10-SIP Module packaging with 9 formed leads and through-hole mounting. No PCB layout modifications are required for substitution.

Q: Are export compliance requirements identical?

A: Yes. Both components carry EAR99 export classification and 8542.39.0001 HTSUS tariff code, maintaining identical compliance status.