Equivalent & Substitute Parts for Ohmite 45F56R

Part Overview

The Ohmite 45F56R is a 56 Ohm, 1% tolerance, 5W through-hole resistor with axial wirewound construction. This component is classified as Active product status and is suitable for applications requiring precision resistive elements in power dissipation circuits. Substitute parts are identified when original inventory becomes unavailable or when alternative packaging or compliance requirements necessitate component replacement while maintaining electrical and mechanical compatibility.

Substiute Parts

45F56R

OhmiteIn Stock: 89245F56R Datasheet

Current PartRFQ

45F56RE

OhmiteIn Stock: 118645F56RE Datasheet

DirectRFQ

ALSR0556R00FE12

Vishay DaleIn Stock: 1035ALSR0556R00FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 45F56R are qualified based on the following electrical and mechanical parameters:

• Resistance value of 56 Ohms
• Tolerance of ±1%
• Power rating of 5W
• Wirewound composition
• Axial package configuration
• Two-terminal design
• Through-hole mounting compatibility

The identified substitutes maintain these core parameters while differing in packaging format, RoHS compliance status, temperature coefficient specifications, and operating temperature ranges. These variations do not affect the primary electrical function of the component in standard applications.

Parameter Comparison

Engineering Selection Recommendations

45F56RE (Ohmite): This substitute maintains identical electrical specifications and physical dimensions to the 45F56R. The primary distinction is RoHS compliance status; the 45F56RE is RoHS Compliant, whereas the original 45F56R is RoHS non-compliant. This substitute is suitable for applications requiring regulatory compliance with modern environmental standards. Operating temperature range extends to 275°C maximum, providing thermal margin for high-temperature applications.

ALSR0556R00FE12 (Vishay Dale): This substitute provides equivalent electrical performance with a slightly higher temperature coefficient (±30ppm/°C versus ±20ppm/°C) and a lower maximum operating temperature (250°C versus 275°C for the 45F56RE). Physical dimensions are marginally smaller (0.312" diameter versus 0.343" diameter). This component includes moisture-resistant construction and ROHS3 compliance. The ALSR series is suitable for applications where space constraints or enhanced moisture resistance are beneficial.

Frequently Asked Questions (FAQ)

Q: Can the 45F56RE be used as a direct replacement for the 45F56R?

A: Yes. The 45F56RE maintains identical resistance value, tolerance, power rating, composition, and physical dimensions. The primary difference is RoHS compliance status. Both components are manufactured by Ohmite and belong to the same product series.

Q: What is the significance of the temperature coefficient difference between the 45F56R and ALSR0556R00FE12?

A: The temperature coefficient indicates resistance value drift with temperature change. The 45F56R has ±20ppm/°C while the ALSR0556R00FE12 has ±30ppm/°C. For applications requiring high precision across wide temperature ranges, the lower coefficient of the 45F56R or 45F56RE is preferable. The difference becomes significant only in precision measurement or high-stability circuit applications.

Q: Are there physical mounting differences between these substitutes?

A: The 45F56R and 45F56RE are identical in physical dimensions (0.343" diameter × 0.937" length). The ALSR0556R00FE12 is slightly smaller (0.312" diameter × 0.875" length). Both maintain axial through-hole configuration and two-terminal design, ensuring compatibility with standard PCB layouts. Verify PCB hole spacing and component clearance when substituting the Vishay Dale part in space-constrained designs.

Q: Which substitute should be selected for new designs?

A: Selection depends on application requirements. For RoHS compliance mandates, select the 45F56RE. For applications requiring moisture resistance or space optimization, select the ALSR0556R00FE12. Both substitutes maintain Active product status and are available in production quantities.

Q: What is the difference between bulk and standard packaging?

A: The 45F56R is supplied in standard packaging while the 45F56RE and ALSR0556R00FE12 are supplied in bulk packaging. This affects order quantities and handling procedures but does not impact component electrical or mechanical performance.