PF2205-18KF1 Equivalent & Substitute Parts

Part Overview

The PF2205-18KF1 is an 18 kOhms ±1% 50W through-hole resistor in TO-220-2 package manufactured by Riedon. This thin film current sense resistor is designed for high-power applications requiring precision and reliability. The part is classified as Not For New Designs, making identification of suitable alternatives essential for ongoing production and maintenance applications. Substitute parts must maintain electrical performance, mechanical compatibility, and compliance certifications while accommodating the transition from this legacy component.

Substiute Parts

PF2205-18KF1

RiedonIn Stock: 904PF2205-18KF1 Datasheet

Current PartRFQ

PWR221T-50-1802F

Bourns Inc.In Stock: 708PWR221T-50-1802F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PF2205-18KF1 is determined by the following critical parameters:

Electrical Parameters: Resistance value (18 kOhms), tolerance (±1%), and power rating (50W) must be identical. These parameters define the functional role in current sensing and power dissipation applications.

Package Compatibility: TO-220-2 package is mandatory for mechanical and thermal interface compatibility with existing PCB layouts and mounting hardware.

Compliance Requirements: RoHS3 compliance and EAR99 ECCN classification must be maintained for regulatory and export control alignment.

Operational Constraints: Operating temperature range and temperature coefficient determine performance stability across the application's thermal environment.

The PWR221T-50-1802F from Bourns Inc. qualifies as a substitute based on matching resistance, tolerance, power rating, and TO-220-2 package configuration, with equivalent compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The PWR221T-50-1802F is the qualified substitute for PF2205-18KF1 applications. Both components maintain ROHS3 compliance and EAR99 classification, ensuring regulatory alignment. The substitute is currently in Active product status, providing supply continuity and long-term availability compared to the legacy PF2205-18KF1.

Key considerations for selection:

Composition Difference: The substitute uses thick film construction versus the original thin film design. Both compositions meet the ±1% tolerance and 50W power specification.

Temperature Performance: The original component operates to 155°C with ±50ppm/°C coefficient. The substitute operates to 150°C with ±100ppm/°C coefficient. Applications requiring operation above 150°C or demanding superior temperature stability below ±50ppm/°C must evaluate thermal performance requirements.

Package Dimensions: Minor dimensional variations exist between components. Verify PCB layout clearances and thermal management provisions accommodate the substitute's physical envelope.

Supply Status: The substitute's Active status ensures availability for production quantities, whereas the original component's Not For New Designs classification indicates limited future supply.

Frequently Asked Questions (FAQ)

Q: Can PWR221T-50-1802F directly replace PF2205-18KF1 in existing designs?

A: Yes, for applications where the operating temperature does not exceed 150°C and the higher temperature coefficient (±100ppm/°C versus ±50ppm/°C) is acceptable. Verify thermal management and tolerance stack-up in your circuit analysis.

Q: What is the primary difference between these components?

A: The main differences are composition (thin film versus thick film), temperature coefficient (±50ppm/°C versus ±100ppm/°C), and maximum operating temperature (155°C versus 150°C). Electrical specifications and package type are identical.

Q: Are both components RoHS compliant?

A: Yes, both PF2205-18KF1 and PWR221T-50-1802F are ROHS3 compliant and carry EAR99 ECCN classification.

Q: Does the TO-220-2 Full Pack designation affect compatibility?

A: The TO-220-2 Full Pack refers to packaging configuration and does not affect electrical or mechanical compatibility. Both components use the same TO-220-2 lead configuration and foot