PF2205-5RF1 Equivalent & Substitute Parts

Part Overview

The PF2205-5RF1 is a 5 Ohm ±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 pulse withstanding capability. The part is classified as Not For New Designs, making identification of suitable alternatives essential for ongoing production and new design initiatives.

Substiute Parts

PF2205-5RF1

RiedonIn Stock: 986PF2205-5RF1 Datasheet

Current PartRFQ

PWR221T-50-5R00F

Bourns Inc.In Stock: 1179PWR221T-50-5R00F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PF2205-5RF1 is determined by the following critical parameters:

• Resistance value: 5 Ohms
• Tolerance: ±1%
• Power rating: 50W
• Package type: TO-220-2
• Number of terminations: 2
• Temperature coefficient: ±100ppm/°C
• RoHS compliance: ROHS3 Compliant

The PWR221T-50-5R00F from Bourns Inc. meets all mandatory electrical and mechanical substitution criteria. Both parts share identical resistance, tolerance, power rating, package configuration, and termination count. The substitute maintains equivalent temperature coefficient performance and RoHS3 compliance status.

Parameter Comparison

Engineering Selection Recommendations

The PWR221T-50-5R00F is an active product from Bourns Inc., whereas the PF2205-5RF1 is designated Not For New Designs. For new design initiatives, the PWR221T-50-5R00F is the appropriate selection due to its Active product status and ROHS3 compliance.

Both parts meet the core electrical requirements: 5 Ohm resistance at ±1% tolerance with 50W power handling in TO-220-2 package. The operating temperature range of the substitute (-55°C ~ 150°C) covers the majority of industrial applications, with a 5°C difference at the upper limit compared to the original part.

The composition difference (Thick Film vs. Thin Film) reflects different manufacturing technologies. Both technologies are established for current sense applications and meet the specified electrical parameters. The Bourns part includes Automotive AEC-Q200 qualification, providing additional reliability documentation for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can PWR221T-50-5R00F directly replace PF2205-5RF1 in existing designs?

A: Yes. Both parts share identical electrical specifications (5 Ohms ±1%, 50W, ±100ppm/°C) and the same TO-220-2 package with 2 terminations. Physical dimensions are similar, with the Bourns part measuring 0.410" L x 0.125" W versus 0.417" L x 0.177" W for the Riedon part. PCB layout compatibility should be verified for height clearance, as the Bourns part has a maximum seated height of 0.760" compared to 0.591" for the original.

Q: What is the significance of the composition difference?

A: The PF2205-5RF1 uses thin film technology while the PWR221T-50-5R00F uses thick film technology. Both technologies deliver the specified electrical performance for current sense applications. Thin film resistors typically offer tighter tolerances and lower temperature coefficients, while thick film resistors provide robust pulse withstanding capability. Both parts meet the ±1% tolerance and ±100ppm/°C temperature coefficient requirements.

Q: Are there compliance differences between the two parts?

A: Both parts are ROHS3 compliant. The PWR221T-50-5R00F includes Automotive AEC-Q200 qualification, which is not specified for the PF2205-5RF1. This additional qualification may be beneficial for automotive or high-reliability applications but is not required for general industrial use.

Q: What is the maximum operating temperature difference?

A: The PF2205-5RF1 operates to 155°C while the PWR221T-50-5R00F operates to 150°C. This 5°C difference is within typical design margins for most applications. Applications requiring operation above 150°C should retain the original Riedon part or identify alternative solutions.

Q: How do the physical dimensions affect PCB layout?

A: The Bourns PWR221T-50-5R00F is slightly shorter in length (0.410" vs. 0.417") but significantly taller when seated (0.760" vs. 0.591"). Verify clearance above the component on the PCB. The width difference (0.125" vs. 0.177") may affect thermal management considerations in high-density layouts.