Equivalent & Substitute Parts for 45JR50E

Part Overview

The 45JR50E is a 500 mOhms ±5% 5W through-hole axial wirewound resistor manufactured by Ohmite, part of the Ohmicone® 40 series. This component is actively produced and widely used in applications requiring precision current-sensing and power dissipation in compact form factors. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the allowed parameter range for this resistor category.

Substiute Parts

45JR50E

OhmiteIn Stock: 80945JR50E Datasheet

Current PartRFQ

55JR50E

OhmiteIn Stock: 277255JR50E Datasheet

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45FR50E

OhmiteIn Stock: 133345FR50E Datasheet

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ALSR05R5000JE12

Vishay DaleIn Stock: 1240ALSR05R5000JE12 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 45JR50E are qualified based on the following criteria:

Electrical Parameters (Critical):

• Resistance value: 500 mOhms (exact match required)
• Power rating: 5W (exact match required)
• Composition: Wirewound (exact match required)
• Temperature coefficient: ±90ppm/°C (exact match required)

Mechanical Parameters (Critical):

• Package type: Axial through-hole (exact match required)
• Number of terminations: 2 (exact match required)

Tolerance Variations (Allowed):

• Tolerance may vary from ±5% to ±1% (tighter tolerance is acceptable as an upgrade)

Environmental & Compliance Parameters (Allowed Variations):

• Operating temperature range may vary within acceptable limits
• RoHS and REACH compliance status may differ
• Packaging format (Box vs. Bulk) does not affect electrical or mechanical compatibility

Three substitute parts meet these criteria and are listed below.

Parameter Comparison

Engineering Selection Recommendations

45JR50E (Ohmite Ohmicone® 40 Series): Use as the primary specification. RoHS Compliant status and Ohmicone® 40 series designation provide established performance history. Operating temperature range extends to 275°C, suitable for high-temperature applications.

55JR50E (Ohmite Series 50): Direct electrical equivalent with identical tolerance (±5%), power rating (5W), and temperature coefficient (±90ppm/°C). Slightly smaller physical dimensions (0.315" Dia x 0.827" L) may be advantageous in space-constrained layouts. ROHS3 Compliant status meets current regulatory requirements. Bulk packaging format available.

45FR50E (Ohmite Ohmicone® 40 Series - Upgrade): Tighter tolerance specification (±1% vs. ±5%) provides improved accuracy for precision current-sensing applications. Identical physical dimensions and series designation to the main part. ROHS3 Compliant. Use when tolerance requirements exceed ±5%.

ALSR05R5000JE12 (Vishay Dale ALSR Series): Electrical equivalent with ±5% tolerance and ±90ppm/°C temperature coefficient. Includes moisture-resistant feature not specified in the main part. Operating temperature range (-65°C ~ 250°C) is narrower than the main part. Physical dimensions are comparable (0.312" Dia x 0.875" L). ROHS3 Compliant. Suitable for applications requiring moisture resistance in standard operating temperature ranges.

Frequently Asked Questions (FAQ)

Q: Can 55JR50E be used as a direct replacement for 45JR50E?

A: Yes. Both parts share identical electrical specifications: 500 mOhms resistance, ±5% tolerance, 5W power rating, ±90ppm/°C temperature coefficient, and wirewound axial package type. Physical dimensions differ slightly (55JR50E is smaller), but this does not affect electrical performance or standard PCB mounting compatibility.

Q: What is the advantage of 45FR50E over 45JR50E?

A: The 45FR50E provides tighter tolerance (±1% vs. ±5%), resulting in improved accuracy for current-sensing and precision measurement applications. Both parts are identical in physical dimensions, power rating, and temperature coefficient. Use 45FR50E when circuit design requires tolerance better than ±5%.

Q: Is ALSR05R5000JE12 compatible with 45JR50E in all applications?

A: ALSR05R5000JE12 is electrically equivalent for standard operating conditions. The key difference is the moisture-resistant feature and a narrower operating temperature range (-65°C ~ 250°C vs. -55°C ~ 275°C). Verify that the application's maximum operating temperature does not exceed 250°C before substitution.

Q: Do packaging format differences (Box vs. Bulk) affect component selection?

A: No. Packaging format (Box or Bulk) is a supply and logistics consideration only. It does not affect electrical performance, mechanical compatibility, or PCB mounting. Selection should be based on procurement quantity and inventory management requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. The main part 45JR50E is RoHS Compliant. All three substitute parts (55JR50E, 45FR50E, and ALSR05R5000JE12) are ROHS3 Compliant, meeting current regulatory standards.

Q: Can physical dimension differences affect PCB layout?

A: Physical dimensions vary slightly among substitutes. The 55JR50E is the smallest (0.315" Dia x 0.827" L), while 45JR50E and 45FR50E are identical (0.343" Dia x 0.937" L). ALSR05R5000JE12 is intermediate (0.312" Dia x 0.875" L). Verify PCB footprint clearances and mounting hole spacing before substitution if space constraints are critical.