45F1R0E Equivalent & Substitute Parts

Part Overview

The 45F1R0E is a 1 Ohm ±1% 5W axial wirewound resistor manufactured by Ohmite in the Ohmicone® 40 series. This through-hole component is designed for applications requiring precision resistance with moderate power dissipation in a compact axial package. The part is currently active and RoHS3 compliant. Substitute parts may be required due to inventory availability, packaging format needs, or specific environmental operating requirements.

Substiute Parts

45F1R0E

OhmiteIn Stock: 92345F1R0E Datasheet

Current PartRFQ

WHE1R0FET

OhmiteIn Stock: 2472WHE1R0FET Datasheet

MFR RecommendedRFQ

45F1R0

OhmiteIn Stock: 87945F1R0 Datasheet

Parametric EquivalentRFQ

ALSR051R000FE12

Vishay DaleIn Stock: 1394ALSR051R000FE12 Datasheet

MFR RecommendedRFQ

RS0051R000FE73

Vishay DaleIn Stock: 1827RS0051R000FE73 Datasheet

MFR RecommendedRFQ

UB5C-1RF1

RiedonIn Stock: 2633UB5C-1RF1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 45F1R0E is determined by the following core parameters: resistance value (1 Ohms), tolerance (±1%), power rating (5W), composition (wirewound), package type (axial), and temperature coefficient (±50ppm/°C). All substitute parts listed maintain these electrical specifications. Packaging format (bulk, tape & reel, or cut tape) and physical dimensions may vary within acceptable mechanical tolerances for axial through-hole mounting. Operating temperature range and additional features (moisture resistance, flame proof, current sense capability) are secondary considerations that do not affect basic functional equivalence but may influence selection based on application requirements.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain the core electrical specifications (1 Ohms, ±1% tolerance, 5W power rating, wirewound composition, ±50ppm/°C temperature coefficient) required for functional equivalence to the 45F1R0E.

For applications requiring RoHS3 compliance, the following parts are suitable: WHE1R0FET (Ohmite), ALSR051R000FE12 (Vishay Dale), RS0051R000FE73 (Vishay Dale), and UB5C-1RF1 (Riedon). The part 45F1R0 is RoHS non-compliant and should not be selected for regulated applications.

For applications with extended operating temperature requirements beyond -55°C to 150°C, ALSR051R000FE12, RS0051R000FE73, and UB5C-1RF1 support -65°C to 250°C operation.

Physical dimensions vary among substitutes. The 45F1R0 maintains identical dimensions to the main part (0.343" Dia x 0.937" L). Smaller alternatives include WHE1R0FET (0.295" Dia x 0.787" L) and UB5C-1RF1 (0.250" Dia x 0.500" L), which may be advantageous for space-constrained layouts. Intermediate sizes are offered by ALSR051R000FE12 and RS0051R000FE73 (0.312" Dia x 0.875" L).

Packaging format selection depends on assembly requirements: bulk packaging is available from 45F1R0E, ALSR051R000FE12, and UB5C-1RF1; tape & reel format from WHE1R0FET; and cut tape format from RS0051R000FE73.

Frequently Asked Questions (FAQ)

Q: Can WHE1R0FET be used as a direct replacement for 45F1R0E?

A: Yes. Both parts share identical electrical specifications (1 Ohms, ±1%, 5W, wirewound, ±50ppm/°C). The primary difference is packaging format (tape & reel versus bulk) and physical dimensions (WHE1R0FET is slightly smaller). Mechanical fit must be verified for the specific PCB layout.

Q: What is the difference between 45F1R0E and 45F1R0?

A: Both parts are manufactured by Ohmite with identical electrical and physical specifications. The key distinction is RoHS compliance: 45F1R0E is ROHS3 compliant, while 45F1R0 is RoHS non-compliant. For regulated applications, 45F1R0E is the appropriate selection.

Q: Are Vishay Dale parts (ALSR051R000FE12, RS0051R000FE73) compatible with the 45F1R0E?

A: Yes. Both Vishay Dale parts maintain all core electrical parameters and are ROHS3 compliant. They offer extended operating temperature range (-65°C to 250°C) and moisture-resistant construction. Physical dimensions are slightly smaller than the main part.

Q: Which substitute offers the most compact form factor?

A: The UB5C-1RF1 from Riedon provides the smallest dimensions (0.250" Dia x 0.500" L). This part also includes additional features such as flame proof, current sense capability, and pulse withstanding characteristics.

Q: Is operating temperature range a factor in substitution?

A: Operating temperature range does not affect functional equivalence for standard applications. However, if the circuit operates outside the -55°C to 150°C range specified for WHE1R0FET, selection of ALSR051R000FE12, RS0051R000FE73, or UB5C-1RF1 (all rated to -65°C to 250°C) is necessary.

Q: Can I use 45F1R0 in a new design requiring RoHS compliance?

A: No. The 45F1R0 is RoHS non-compliant and is not suitable for applications subject to RoHS regulations. Select from WHE1R0FET, ALSR051R000FE12, RS0051R000FE73, or UB5C-1RF1 instead.