PWR221-2FC2R50F Equivalent & Substitute Parts

Part Overview

The PWR221-2FC2R50F is a 2.5 Ohm, 1% tolerance, 50W through-hole resistor manufactured by Bourns Inc. in TO-221 package configuration. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part features pulse withstanding capability and thick film composition, designed for applications requiring precision power dissipation in compact form factors.

Substiute Parts

PWR221-2FC2R50F

Bourns Inc.In Stock: 1093PWR221-2FC2R50F Datasheet

Current PartRFQ

MP9100-2.50-1%

Caddock Electronics Inc.In Stock: 1131MP9100-2.50-1% Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PWR221-2FC2R50F is determined by the following critical parameters:

• Resistance value: 2.5 Ohms (exact match required)
• Tolerance: ±1% (precision specification)
• Composition: Thick film (functional requirement)
• Number of terminations: 2 (electrical connectivity)
• RoHS compliance: ROHS3 (regulatory requirement)

The MP9100-2.50-1% qualifies as a substitute based on matching resistance, tolerance, composition, termination count, and RoHS compliance. Package differences (TO-247-2 versus TO-221) and power rating elevation (100W versus 50W) are accommodated within standard engineering practice for through-hole resistor substitution, provided circuit board layout and thermal management are verified for the larger package footprint.

Parameter Comparison

Engineering Selection Recommendations

The MP9100-2.50-1% is suitable for applications currently specified with PWR221-2FC2R50F components. Both parts maintain ROHS3 compliance and active product status for the substitute ensures long-term availability. The substitute part offers extended operating temperature range (-55°C to 175°C versus -40°C to 155°C) and improved temperature coefficient performance (-20/+80ppm/°C versus ±100ppm/°C), providing enhanced thermal stability.

Package transition from TO-221 to TO-247-2 requires verification of printed circuit board layout compatibility. The TO-247-2 package accommodates higher power dissipation (100W rating) and includes moisture-resistant, non-inductive construction features. Circuit board thermal design and component spacing must be evaluated to ensure the larger package footprint does not create thermal or electrical interference issues.

Frequently Asked Questions (FAQ)

Q: Can MP9100-2.50-1% directly replace PWR221-2FC2R50F without circuit modification?

A: Electrical substitution is valid based on matching resistance, tolerance, and composition specifications. Physical substitution requires PCB layout verification due to package size difference (TO-247-2 versus TO-221). Thermal management design should be reviewed to confirm adequate heat dissipation capability.

Q: What are the key differences between these two parts?

A: Primary differences are package type (TO-247-2 versus TO-221), power rating (100W versus 50W), operating temperature range (-55°C to 175°C versus -40°C to 155°C), and temperature coefficient performance. Electrical specifications for resistance and tolerance are identical.

Q: Is the higher power rating of the substitute part a concern?

A: No. A higher power rating does not create functional issues in applications designed for lower power dissipation. The substitute part will operate within its thermal limits when used in circuits specified for 50W operation.

Q: Are both parts RoHS compliant?

A: Yes. Both PWR221-2FC2R50F and MP9100-2.50-1% are ROHS3 compliant, meeting current regulatory requirements for electronic component manufacturing and use.

Q: What is the inventory status for these parts?

A: PWR221-2FC2R50F is obsolete with 983 pieces available in current stock. MP9100-2.50-1% is active production with 1118 pieces in stock, providing assured long-term availability for new designs and production continuity.