45F75R Equivalent & Substitute Parts Reference

Part Overview

The Ohmite 45F75R is a 75 Ohm ±1% 5W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is currently active in production with 725 units in stock. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, compliance upgrades, or packaging format changes while maintaining electrical and mechanical compatibility within the specified parameter tolerances.

Substiute Parts

45F75R

OhmiteIn Stock: 79445F75R Datasheet

Current PartRFQ

45F75RE

OhmiteIn Stock: 86545F75RE Datasheet

DirectRFQ

ALSR0575R00FE12

Vishay DaleIn Stock: 1091ALSR0575R00FE12 Datasheet

DirectRFQ

RS00575R00FS73

Vishay DaleIn Stock: 1858RS00575R00FS73 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 45F75R is determined by strict equivalence across the following critical parameters:

• Resistance value: 75 Ohms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Package configuration: Axial through-hole
• Termination count: 2

All identified substitute parts meet these core electrical and mechanical requirements. Variations in temperature coefficient, physical dimensions within acceptable tolerances, moisture resistance features, and RoHS compliance status do not preclude substitution but are documented for design consideration.

Parameter Comparison

Engineering Selection Recommendations

45F75RE (Ohmite): Direct equivalent from the same manufacturer with identical electrical specifications and physical dimensions. Offers ROHS3 compliance upgrade over the primary part while maintaining the Ohmicone® 40 series platform. Recommended for designs requiring RoHS compliance without dimensional or thermal performance changes.

ALSR0575R00FE12 (Vishay Dale): Meets all core electrical requirements with moisture-resistant construction and extended operating temperature range (-65°C ~ 250°C). Physical dimensions are slightly reduced (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L). Temperature coefficient is ±30ppm/°C versus ±20ppm/°C. ROHS3 compliant. Suitable for applications requiring enhanced environmental protection and wider thermal operating margins.

RS00575R00FS73 (Vishay Dale): Meets all core electrical requirements with moisture-resistant construction and extended operating temperature range (-65°C ~ 250°C). Physical dimensions are slightly reduced (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L). Temperature coefficient matches the primary part at ±20ppm/°C. Available in Cut Tape packaging format. RoHS non-compliant. Suitable for applications requiring moisture resistance and precise temperature stability with alternative packaging requirements.

Frequently Asked Questions (FAQ)

Q: Can 45F75RE be used as a direct drop-in replacement for 45F75R?

A: Yes. Both parts share identical resistance (75 Ohms), tolerance (±1%), power rating (5W), composition (wirewound), package type (axial), temperature coefficient (±20ppm/°C), and physical dimensions (0.343" Dia x 0.937" L). The primary difference is RoHS compliance status. 45F75RE is ROHS3 compliant while 45F75R is not.

Q: What are the physical dimension differences between Ohmite and Vishay Dale substitutes?

A: Ohmite parts (45F75R and 45F75RE) measure 0.343" Dia x 0.937" L (8.70mm x 23.80mm). Vishay Dale parts (ALSR0575R00FE12 and RS00575R00FS73) measure 0.312" Dia x 0.875" L (7.92mm x 22.23mm). The Vishay Dale variants are slightly smaller in both diameter and length. PCB layout and mechanical clearance must be verified before substitution.

Q: How do temperature coefficients affect substitution decisions?

A: The primary part 45F75R and substitutes 45F75RE and RS00575R00FS73 all specify ±20ppm/°C. The ALSR0575R00FE12 specifies ±30ppm/°C, indicating slightly greater resistance drift over temperature. For precision applications with tight tolerance requirements across temperature ranges, the ±20ppm/°C variants are preferred.

Q: What is the difference between bulk and cut tape packaging?

A: 45F75R, 45F75RE, and ALSR0575R00FE12 are supplied in bulk packaging. RS00575R00FS73 is supplied in Cut Tape (CT) format. Bulk packaging is suitable for manual assembly or small-volume production. Cut tape format is optimized for automated pick-and-place assembly equipment. Selection depends on assembly process requirements.

Q: Are moisture-resistant variants necessary for standard applications?

A: Moisture-resistant construction (ALSR0575R00FE12 and RS00575R00FS73) provides enhanced environmental protection but is not required for standard indoor applications. Selection depends on operating environment exposure to humidity, condensation, or corrosive atmospheres.

Q: What is the significance of RoHS compliance in substitute selection?

A: RoHS compliance restricts the use of hazardous substances in electrical and electronic equipment. 45F75RE and ALSR0575R00FE12 are ROHS3 compliant. 45F75R and RS00575R00FS73 are non-compliant. For applications subject to RoHS regulations or customer requirements, compliant variants must be selected.