PF2205-33RF1 Equivalent & Substitute Parts

Part Overview

The PF2205-33RF1 is a 33 Ohm, 1% tolerance, 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 maintenance applications.

Substiute Parts

PF2205-33RF1

RiedonIn Stock: 855PF2205-33RF1 Datasheet

Current PartRFQ

PWR221T-50-33R0F

Bourns Inc.In Stock: 1234PWR221T-50-33R0F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PF2205-33RF1 is determined by the following critical parameters:

• Resistance value: 33 Ohms (exact match required)
• Tolerance: ±1% (precision requirement)
• Power rating: 50W (thermal dissipation capability)
• Package: TO-220-2 (mechanical and electrical interface)
• Number of terminations: 2 (pin configuration)
• Regulatory compliance: ROHS3 and REACH status

The PWR221T-50-33R0F from Bourns Inc. meets all substitution criteria. While it uses thick film composition instead of thin film, both technologies deliver the required electrical performance within the specified tolerance and power rating. The substitute maintains identical resistance, tolerance, power rating, and package configuration, ensuring direct functional equivalence in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The PWR221T-50-33R0F is the qualified substitute for the PF2205-33RF1. Both parts are ROHS3 compliant and share identical electrical specifications for resistance, tolerance, and power rating. The substitute carries Active product status, ensuring long-term availability and supply chain continuity.

The PWR221T-50-33R0F operates within a maximum temperature of 150°C compared to the original part's 155°C upper limit, and exhibits a higher temperature coefficient of ±100ppm/°C versus ±50ppm/°C. These differences are acceptable for applications where the original PF2205-33RF1 was specified, provided circuit design does not depend on the tighter temperature coefficient or the extended upper temperature range.

Frequently Asked Questions (FAQ)

Q: Can PWR221T-50-33R0F directly replace PF2205-33RF1 in existing designs?

A: Yes. Both parts deliver 33 Ohms at ±1% tolerance with 50W power rating in TO-220-2 package. Electrical performance is equivalent for standard current sense applications.

Q: What is the difference between thin film and thick film composition?

A: The PF2205-33RF1 uses thin film technology, while the PWR221T-50-33R0F uses thick film technology. Both achieve the specified tolerance and power rating. The thin film composition of the original provides a tighter temperature coefficient (±50ppm/°C vs ±100ppm/°C), which may be relevant in temperature-sensitive applications.

Q: Are there any thermal or dimensional differences?

A: The PWR221T-50-33R0F has a maximum seated height of 0.760" (19.30mm) compared to 0.591" (15.00mm) for the PF2205-33RF1. Verify PCB layout clearance before substitution. Both parts operate to -55°C minimum; the substitute operates to 150°C maximum versus 155°C for the original.

Q: Is the substitute available in the same packaging format?

A: The PWR221T-50-33R0F is supplied in Tube packaging, while the original PF2205-33RF1 packaging format is not specified in the provided data. Confirm packaging requirements for your procurement process.

Q: What compliance certifications apply to the substitute?

A: The PWR221T-50-33R0F is ROHS3 compliant. REACH status is listed as REACH Unaffected, compared to REACH Affected for the original part.