PF2205-11RF1 Equivalent & Substitute Parts

Part Overview

The PF2205-11RF1 is an 11 Ohms ±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 The part is marked as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Finding equivalent substitute parts is necessary for ongoing production support, maintenance applications, and legacy system repairs where this component specification remains required.

Substiute Parts

PF2205-11RF1

RiedonIn Stock: 878PF2205-11RF1 Datasheet

Current PartRFQ

PWR221T-50-11R0F

Bourns Inc.In Stock: 971PWR221T-50-11R0F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PF2205-11RF1 is determined by the following critical parameters:

• Resistance value: 11 Ohms (exact match required)
• Tolerance: ±1% (precision specification)
• Power rating: 50W (thermal capability)
• Package: TO-220-2 (mechanical and electrical interface)
• Number of terminations: 2 (pin configuration)
• Operating temperature range: minimum -55°C to 150°C or higher
• RoHS3 compliance (regulatory requirement)

The PWR221T-50-11R0F from Bourns Inc. meets all these substitution criteria. While it uses thick film composition instead of thin film, and has a higher temperature coefficient (±100ppm/°C versus ±50ppm/°C), these differences remain within acceptable substitution parameters for current sense applications where the primary electrical characteristics (resistance, tolerance, power, and package) are preserved.

Parameter Comparison

Engineering Selection Recommendations

The PWR221T-50-11R0F is the qualified substitute for PF2205-11RF1 applications. Both parts maintain identical electrical specifications for resistance (11 Ohms ±1%) and power handling (50W), with matching TO-220-2 package configurations. Both components are ROHS3 compliant and suitable for current sense applications.

Selection between these parts should be based on product status and availability. The PF2205-11RF1 carries a Not For New Designs status, making it unsuitable for new product development. The PWR221T-50-11R0F maintains Active product status from Bourns, providing long-term supply assurance and ongoing manufacturer support.

The PWR221T-50-11R0F exhibits a higher temperature coefficient (±100ppm/°C versus ±50ppm/°C) and a slightly lower maximum operating temperature (150°C versus 155°C). These differences are acceptable for most current sense applications where the primary requirement is stable resistance value and adequate power dissipation capability within the specified operating range.

Frequently Asked Questions (FAQ)

Q: Can PWR221T-50-11R0F directly replace PF2205-11RF1 in existing designs?

A: Yes. Both parts share identical resistance (11 Ohms ±1%), power rating (50W), and TO-220-2 package configuration. The electrical interface and mechanical mounting are compatible. The higher temperature coefficient of the Bourns part (±100ppm/°C) is acceptable for current sense applications where resistance stability is maintained within ±1% tolerance across the operating range.

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

A: The PF2205-11RF1 uses thin film technology, while the PWR221T-50-11R0F uses thick film technology. Both achieve ±1% tolerance and 50W power rating. Thin film resistors typically offer lower temperature coefficients and better stability; however, the thick film substitute meets the electrical requirements for this application category.

Q: Are there any temperature range limitations when substituting?

A: The PWR221T-50-11R0F operates from -55°C to 150°C, compared to the original part's -55°C to 155°C range. If your application requires operation above 150°C, the original PF2205-11RF1 specification must be maintained. For applications within -55°C to 150°C, the substitute is fully compatible.

Q: What is the significance of the TO-220-2 Full Pack designation?

A: The TO-220-2 Full Pack indicates the complete lead frame and packaging configuration. This designation confirms mechanical and electrical compatibility with standard TO-220-2 mounting and connection requirements. Both parts use identical package interfaces.

Q: Why is the original part marked Not For New Designs?

A: This status indicates the PF2205-11RF1 has been superseded in Riedon's product line. For new product development, the PWR221T-50-11R0F (Active status) is the recommended selection. For legacy system support and maintenance, the original part may still be sourced if available inventory exists.