Ohmite 45F1R0 Equivalent & Substitute Parts

Part Overview

The Ohmite 45F1R0 is a 1 Ohm ±1% 5W through-hole axial wirewound resistor from the Ohmicone® 40 series. This component is designed for applications requiring precision resistance with moderate power dissipation in a compact axial package. The part is currently active in production with 777 units in stock. Substitute parts are identified when the original manufacturer part becomes unavailable, when alternative compliance certifications are required, or when inventory constraints necessitate sourcing from qualified alternative manufacturers.

Substiute Parts

45F1R0

OhmiteIn Stock: 87945F1R0 Datasheet

Current PartRFQ

ALSR051R000FE12

Vishay DaleIn Stock: 1394ALSR051R000FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 45F1R0 is determined by the following critical parameters:

• Resistance value: 1 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 5W (exact match required)
• Composition: Wirewound (exact match required)
• Package: Axial (exact match required)
• Temperature coefficient: ±50ppm/°C (exact match required)
• Termination count: 2 (exact match required)

The Vishay Dale ALSR051R000FE12 meets all critical electrical and mechanical parameters. This substitute maintains identical resistance, tolerance, power rating, composition, and package configuration. Both parts are wirewound axial resistors with matching temperature coefficients and termination specifications, ensuring functional equivalence in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the Ohmite 45F1R0 and Vishay Dale ALSR051R000FE12 are active production parts with identical core electrical specifications. Selection between these parts should be based on the following factors:

The Ohmite 45F1R0 is suitable for applications where RoHS non-compliant components are acceptable and where the original manufacturer specification is required.

The Vishay Dale ALSR051R000FE12 is the appropriate choice for applications requiring ROHS3 compliance. This substitute offers moisture-resistant construction and is available in higher inventory quantities (1286 units in stock versus 777 units). The slightly smaller physical dimensions (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L) may provide layout advantages in space-constrained applications while maintaining full electrical equivalence.

Frequently Asked Questions (FAQ)

Q: Can the Vishay Dale ALSR051R000FE12 be used as a direct replacement for the Ohmite 45F1R0?

A: Yes. Both parts share identical resistance (1 Ohm), tolerance (±1%), power rating (5W), composition (wirewound), temperature coefficient (±50ppm/°C), and axial package configuration. The electrical performance is equivalent.

Q: What is the difference in physical size between these parts?

A: The Ohmite 45F1R0 measures 0.343" Dia x 0.937" L (8.70mm x 23.80mm). The Vishay Dale ALSR051R000FE12 measures 0.312" Dia x 0.875" L (7.92mm x 22.23mm). The Vishay Dale part is slightly smaller in both diameter and length, which may be beneficial for compact PCB layouts.

Q: What is the significance of the RoHS compliance difference?

A: The Ohmite 45F1R0 is RoHS non-compliant, while the Vishay Dale ALSR051R000FE12 is ROHS3 compliant. Applications subject to RoHS regulations or customer requirements must use the ROHS3 compliant substitute.

Q: Does the moisture-resistant feature of the Vishay Dale part affect performance?

A: The moisture-resistant construction of the Vishay Dale ALSR051R000FE12 provides enhanced environmental protection without altering the core electrical specifications. Both parts maintain the same temperature coefficient and operating characteristics.

Q: Are there any PCB layout considerations when switching between these parts?

A: The axial package configuration is identical for both parts. The slightly smaller dimensions of the Vishay Dale part may allow for tighter component spacing. Both parts use 2 terminations in standard axial configuration, requiring no changes to footprint design.