FSFR1800US Equivalent & Substitute Parts

Part Overview

The FSFR1800US is an offline switching half-bridge power management IC manufactured by onsemi, designed for isolated converter applications with up to 300kHz switching frequency capability. This component operates as a power factor correction and converter controller in offline topologies, delivering up to 260W of power with integrated fault protection mechanisms.

The FSFR1800US 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

FSFR1800US

onsemiIn Stock: 18590FSFR1800US Datasheet

Current PartRFQ

FSFR1800XS

onsemiIn Stock: 6489FSFR1800XS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSFR1800US is determined by strict alignment with the following critical parameters:

• Topology: Half-Bridge configuration
• Output Isolation: Isolated operation
• Internal Switches: Integrated switching capability
• Voltage - Breakdown: 500V rating
• Voltage - Supply Range: 10V ~ 25V
• Voltage - Start Up: 12.5V
• Duty Cycle: 50%
• Frequency - Switching: Up to 300kHz
• Power Rating: 260W
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control
• Operating Temperature Range: -40°C ~ 130°C (TJ)
• Package Type: 9-SIP Through Hole Module
• Base Product Number: FSFR1800

The FSFR1800XS qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. Both components share the same base product number (FSFR1800), identical functional specifications, and compatible through-hole packaging. The primary difference is the series designation (FSFR-XS versus FSFR-US) and packaging format (Tube versus standard).

Parameter Comparison

Engineering Selection Recommendations

Both the FSFR1800US and FSFR1800XS are classified as obsolete products. Selection between these components should be based on the following factors:

FSFR1800US carries REACH Unaffected status and is available in standard packaging configuration. This variant is suitable for applications where the original series designation and packaging format must be maintained.

FSFR1800XS carries ROHS3 Compliant certification in addition to REACH Unaffected status, providing enhanced environmental compliance documentation. This variant is supplied in Tube packaging and represents the extended series variant of the base FSFR1800 product line.

Both components share identical electrical specifications, fault protection mechanisms, and thermal operating ranges. The choice between variants depends on compliance documentation requirements, packaging logistics, and inventory availability rather than functional performance differences.

Frequently Asked Questions (FAQ)

Q: Can FSFR1800XS directly replace FSFR1800US in existing designs?

A: Yes. Both components share identical electrical specifications including topology, voltage ratings, switching frequency, power rating, fault protection, and operating temperature range. The through-hole package configuration and pin count are compatible. The primary differences are series designation and packaging format.

Q: What is the significance of the series designation change from FSFR-US to FSFR-XS?

A: The series designation indicates the product variant within the FSFR1800 base product line. Both series variants maintain the same core electrical and mechanical specifications. The designation change reflects onsemi's product line evolution rather than functional differences.

Q: Are there any compliance differences between FSFR1800US and FSFR1800XS?

A: FSFR1800XS includes ROHS3 Compliant certification, while FSFR1800US does not specify this status. Both carry REACH Unaffected designation. If RoHS3 compliance documentation is required, FSFR1800XS is the appropriate selection.

Q: What packaging formats are available for these components?

A: FSFR1800US is supplied in standard packaging. FSFR1800XS is supplied in Tube packaging. Both use 9-SIP through-hole module configuration with formed leads suitable for PCB insertion.

Q: Are both components still in production?

A: No. Both FSFR1800US and FSFR1800XS carry obsolete product status. Availability is limited to existing inventory. For new designs, consultation with onsemi regarding current-generation alternatives is recommended based on your specific application requirements.