45FR30 Equivalent & Substitute Parts

Part Overview

The 45FR30 is a 300 mOhms ±1% 5W axial wirewound resistor manufactured by Ohmite in the Ohmicone® 40 series. This component is an active product designed for through-hole applications requiring precision current-sensing or low-resistance load applications. Substitute parts are identified when original inventory is unavailable or when alternative manufacturers' components meet identical electrical and mechanical specifications.

Substiute Parts

45FR30

OhmiteIn Stock: 109945FR30 Datasheet

Current PartRFQ

ALSR05R3000FE12

Vishay DaleIn Stock: 973ALSR05R3000FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The ALSR05R3000FE12 from Vishay Dale qualifies as a direct substitute for the 45FR30 based on the following critical parameters:

• Resistance Value: Both components are rated at 300 mOhms
• Tolerance: Both maintain ±1% tolerance
• Power Rating: Both are rated for 5W dissipation
• Composition: Both are wirewound construction
• Package Type: Both use axial through-hole packaging with 2 terminations
• Electrical Compatibility: Identical resistance and tolerance ensure functional equivalence in circuit applications

Physical dimensions differ slightly (45FR30: 0.343" Dia × 0.937" L; ALSR05R3000FE12: 0.312" Dia × 0.875" L), but both conform to standard axial package envelopes and are compatible with typical PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

45FR30 (Ohmite): Select when original component specification is required or when RoHS non-compliant status is acceptable for the application. This component is active and available with 1018 pieces in stock.

ALSR05R3000FE12 (Vishay Dale): Select as a substitute when ROHS3 compliance is required or when moisture-resistant construction is beneficial for the operating environment. This component is active and available with 916 pieces in stock. The extended operating temperature range (-65°C ~ 250°C) provides additional thermal margin compared to the unspecified range of the 45FR30.

Both components share identical electrical specifications (300 mOhms, ±1%, 5W) and axial package configuration, ensuring direct functional substitution in circuit applications. Physical dimension differences are minor and compatible with standard through-hole PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can ALSR05R3000FE12 replace 45FR30 in all applications? A: Yes, for applications where the electrical specifications (300 mOhms, ±1%, 5W) and axial package are the primary requirements. The ALSR05R3000FE12 provides ROHS3 compliance and moisture resistance as additional benefits. Verify PCB layout clearances due to minor dimensional differences.

Q: What is the primary difference between these two parts? A: The ALSR05R3000FE12 is ROHS3 compliant with moisture-resistant construction and a specified operating temperature range of -65°C ~ 250°C. The 45FR30 is RoHS non-compliant with a temperature coefficient of ±90ppm/°C. Both deliver identical electrical performance.

Q: Are the physical dimensions compatible with existing PCB designs? A: Both components use standard axial through-hole packaging. The 45FR30 measures 0.343" Dia × 0.937" L, while the ALSR05R3000FE12 measures 0.312" Dia × 0.875" L. These minor differences are within typical PCB layout tolerances for axial components.

Q: Which part should be selected for new designs? A: The ALSR05R3000FE12 is recommended for new designs due to ROHS3 compliance and moisture-resistant construction, which align with current manufacturing standards and environmental regulations.

Q: Is temperature coefficient a critical factor in substitution? A: The 45FR30 specifies ±90ppm/°C, while the ALSR05R3000FE12 does not provide this specification. For applications where temperature coefficient is critical, verify the ALSR05R3000FE12 specification with the manufacturer or retain the 45FR30.