FSFR1700 Equivalent & Substitute Parts

Part Overview

The FSFR1700 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. The device integrates internal switches and comprehensive fault protection including current limiting, overload, overvoltage, and overtemperature monitoring.

The FSFR1700 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support long-term product support for applications currently utilizing this component.

Substiute Parts

FSFR1700

onsemiIn Stock: 3978FSFR1700 Datasheet

Current PartRFQ

FSFR1700XS

Fairchild SemiconductorIn Stock: 1584FSFR1700XS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSFR1700 is determined by strict alignment of the following critical parameters:

Topology & Functional Requirements:

• Half-bridge converter topology
• Isolated output configuration
• Internal integrated switches
• 500V breakdown voltage rating

Electrical Performance Specifications:

• Switching frequency capability up to 300kHz
• 200W power rating
• 50% duty cycle operation
• Fault protection features (current limiting, overtemperature, overvoltage)

Physical & Environmental Compatibility:

• 9-SIP package configuration with through-hole mounting
• Operating temperature range -40°C to 130°C (TJ)
• Supply voltage range compatibility

Regulatory & Compliance:

• ROHS3 compliance
• REACH compliance status
• ECCN and HTSUS classifications

The FSFR1700XS meets all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

The FSFR1700XS is an active substitute for the obsolete FSFR1700. Both devices share identical core electrical specifications including 500V breakdown voltage, 200W power rating, 300kHz switching frequency capability, and -40°C to 130°C operating temperature range.

The FSFR1700XS offers improved supply voltage range (10V ~ 25V versus 11.3V ~ 25V) and lower startup voltage requirement (12.5V versus 14.5V), providing enhanced operational flexibility in low-voltage supply scenarios.

Both parts maintain equivalent regulatory compliance with ROHS3 and REACH standards, and share identical ECCN and HTSUS classifications. The through-hole mounting configuration and 9-lead SIP package format remain consistent between both devices.

The FSFR1700XS is recommended for new designs and as a direct replacement for FSFR1700 applications where supply chain continuity is required.

Frequently Asked Questions (FAQ)

Q: Can FSFR1700XS directly replace FSFR1700 in existing designs?

A: Yes. Both devices share identical topology, isolation configuration, breakdown voltage, power rating, switching frequency capability, and operating temperature range. The FSFR1700XS offers improved supply voltage range and lower startup voltage, making it functionally compatible for direct substitution.

Q: What are the key differences between FSFR1700 and FSFR1700XS?

A: The primary differences are manufacturer (onsemi versus Fairchild Semiconductor), product status (obsolete versus active), supply voltage range (11.3V ~ 25V versus 10V ~ 25V), startup voltage (14.5V versus 12.5V), and fault protection features (FSFR1700 includes overload protection; FSFR1700XS does not). Both maintain identical core electrical and thermal specifications.

Q: Are package dimensions identical between FSFR1700 and FSFR1700XS?

A: Both devices use 9-lead through-hole SIP packages with formed leads. The FSFR1700 uses 10-SIP module configuration while FSFR1700XS uses 10-SSIP module configuration. Physical compatibility should be verified against specific PCB footprint requirements.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both FSFR1700 and FSFR1700XS are ROHS3 compliant, REACH unaffected, and classified under identical ECCN (EAR99) and HTSUS (8542.39.0001) codes.

Q: Why is FSFR1700 listed as obsolete?

A: The FSFR1700 has reached end-of-life status. The FSFR1700XS remains in active production and serves as the current equivalent for this product family.