FSFR1800HS Equivalent & Substitute Parts

Part Overview

The FSFR1800HS is an offline switch half-bridge integrated circuit manufactured by onsemi, designed for power conversion applications with isolated output topology. This device operates at switching frequencies up to 600kHz and delivers up to 260W of power. The product is currently obsolete, making identification of suitable substitute components essential for system redesign, legacy product support, and continued manufacturing operations.

Substiute Parts

FSFR1800HS

onsemiIn Stock: 1274FSFR1800HS Datasheet

Current PartRFQ

NCP13992ACDR2G

onsemiIn Stock: 20297NCP13992ACDR2G Datasheet

MFR RecommendedRFQ

FSFR1800HSL

Fairchild SemiconductorIn Stock: 16297FSFR1800HSL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the FSFR1800HS are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Topology: Half-Bridge configuration
• Output Isolation: Isolated topology
• Voltage - Supply Range: Compatible input voltage window
• Frequency - Switching: Operating frequency range overlap
• Duty Cycle: 50% operation
• Fault Protection: Current limiting and over-temperature protection capability
• RoHS Compliance: ROHS3 Compliant status

The FSFR1800HS has two identified substitutes: NCP13992ACDR2G (manufacturer-recommended) and FSFR1800HSL (parametric equivalent). Both maintain the half-bridge isolated topology and 50% duty cycle operation. However, they differ in packaging, mounting technology, supply voltage ranges, and switching frequency specifications, requiring careful evaluation for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

NCP13992ACDR2G is the manufacturer-recommended substitute and is currently in active production status with 20,200 units in stock. This part maintains onsemi manufacturing continuity and ROHS3 compliance. The supply voltage range (7.5V ~ 10V) is narrower than the original FSFR1800HS (10V ~ 25V), requiring verification that application input voltage specifications fall within this window. The switching frequency range (20kHz ~ 750kHz) encompasses the original 600kHz maximum specification. Mounting conversion from through-hole to surface mount (16-SOIC package) requires PCB redesign. Operating temperature range extends to -50°C ~ 150°C, providing broader environmental coverage than the original part.

FSFR1800HSL is a parametric equivalent from Fairchild Semiconductor with active product status and 16,196 units in stock. Limited parameter data is provided for this substitute, with critical specifications including voltage supply range, switching frequency, and output isolation characteristics not specified in the available documentation. This part shares the base product number FSFR1800 with the original component. Selection of this substitute requires access to complete datasheet specifications to confirm compatibility with application requirements.

Both substitutes maintain REACH compliance status. Component selection should prioritize NCP13992ACDR2G where supply voltage and PCB redesign constraints permit, due to complete parameter documentation and active manufacturer support.

Frequently Asked Questions (FAQ)

Q: Why is the FSFR1800HS obsolete and what are the implications?

A: The FSFR1800HS has reached end-of-life status with onsemi. Continued use in new designs is not recommended. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Redesign using active substitute components is necessary for sustained manufacturing operations.

Q: Can NCP13992ACDR2G directly replace FSFR1800HS without PCB modification?

A: No. NCP13992ACDR2G uses a 16-SOIC surface-mount package, while FSFR1800HS uses a 10-SIP through-hole module. PCB redesign is required. Additionally, the supply voltage range differs (7.5V ~ 10V versus 10V ~ 25V), requiring verification that your application input voltage falls within the narrower NCP13992ACDR2G specification.

Q: What are the key electrical differences between FSFR1800HS and NCP13992ACDR2G?

A: Both devices maintain half-bridge isolated topology and 50% duty cycle operation. NCP13992ACDR2G provides a wider switching frequency range (20kHz ~ 750kHz) compared to FSFR1800HS (up to 600kHz). NCP13992ACDR2G offers extended operating temperature range (-50°C ~ 150°C versus -40°C ~ 130°C). The supply voltage window is narrower for NCP13992ACDR2G, which may impact applications requiring higher input voltages.

Q: What information is missing for FSFR1800HSL that affects substitution decisions?

A: Critical parameters not provided for FSFR1800HSL include voltage supply range, switching frequency specification, power rating, voltage breakdown rating, and internal switch configuration. These parameters are essential for confirming functional equivalence. Complete datasheet review is required before selecting this substitute.

Q: Are both substitutes RoHS compliant?

A: NCP13992ACDR2G is ROHS3 compliant. FSFR1800HSL status is listed as REACH Unaffected with RoHS compliance not explicitly stated in available data. Verify RoHS compliance documentation with the component supplier before final selection.

Q: What is the inventory status of these substitutes?

A: NCP13992ACDR2G has 20,200 units in stock. FSFR1800HSL has 16,196 units in stock. Both are available as new original components through authorized distributors.