Ohmite 45F220 Equivalent & Substitute Parts

Part Overview

The Ohmite 45F220 is a 220 Ohm ±1% 5W through-hole axial wirewound resistor from the Ohmicone® 40 series. This component is actively manufactured and maintained in stock inventory. Substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support applications requiring alternative compliance certifications or packaging formats.

Substiute Parts

45F220

OhmiteIn Stock: 72245F220 Datasheet

Current PartRFQ

ALSR05220R0FE12

Vishay DaleIn Stock: 942ALSR05220R0FE12 Datasheet

DirectRFQ

RS005220R0FS73

Vishay DaleIn Stock: 1122RS005220R0FS73 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Ohmite 45F220 are qualified based on the following electrical and mechanical parameters:

• Resistance value: 220 Ohms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Package configuration: Axial through-hole
• Termination count: 2
• Physical compatibility: Axial package dimensions within acceptable installation tolerances

The identified substitutes maintain these core parameters while offering variations in temperature coefficient, operating temperature range, moisture resistance features, compliance certifications, and packaging formats.

Parameter Comparison

Engineering Selection Recommendations

Ohmite 45F220: Select this part for applications where RoHS non-compliance is acceptable and the original design specification requires the Ohmicone® 40 series characteristics. The larger physical dimensions (0.343" diameter) may require board layout consideration.

Vishay Dale ALSR05220R0FE12: This substitute provides ROHS3 compliance and moisture-resistant construction with unlimited moisture sensitivity rating. The temperature coefficient is ±30ppm/°C, which is 50% higher than the main part. Select this option for applications requiring RoHS compliance and enhanced moisture protection. Physical dimensions are smaller (0.312" diameter x 0.875" length).

Vishay Dale RS005220R0FS73: This substitute maintains the ±20ppm/°C temperature coefficient matching the main part and provides an extended operating temperature range (-65°C ~ 250°C). REACH compliance status is affected. Available in Cut Tape packaging format. Select this option when temperature coefficient matching is critical and tape packaging is preferred for automated assembly. Physical dimensions match the ALSR variant.

Frequently Asked Questions (FAQ)

Q: Can the Vishay Dale ALSR05220R0FE12 be used as a direct replacement for the Ohmite 45F220?

A: Yes, from an electrical standpoint. Both parts share identical resistance (220 Ohms), tolerance (±1%), and power rating (5W). The ALSR variant has a higher temperature coefficient (±30ppm/°C vs. ±20ppm/°C) and smaller physical dimensions. Verify board layout compatibility before substitution.

Q: What is the difference between the two Vishay Dale substitutes?

A: The ALSR05220R0FE12 offers ROHS3 compliance and moisture-resistant features with unlimited MSL rating. The RS005220R0FS73 matches the original temperature coefficient (±20ppm/°C) and is supplied in Cut Tape packaging. The RS variant is RoHS non-compliant but provides tighter temperature coefficient control.

Q: Are there physical dimension differences that affect PCB layout?

A: Yes. The Ohmite 45F220 measures 0.343" diameter x 0.937" length. Both Vishay Dale substitutes measure 0.312" diameter x 0.875" length. The smaller dimensions may allow tighter component spacing but require verification of lead hole compatibility and mounting clearances.

Q: Which substitute should I select for RoHS-compliant designs?

A: The Vishay Dale ALSR05220R0FE12 is ROHS3 compliant. The Ohmite 45F220 and Vishay Dale RS005220R0FS73 are both RoHS non-compliant.

Q: How do temperature coefficients affect circuit performance?

A: Temperature coefficient determines resistance value drift with temperature changes. The Ohmite 45F220 and Vishay Dale RS005220R0FS73 both specify ±20ppm/°C. The Vishay Dale ALSR05220R0FE12 specifies ±30ppm/°C, resulting in greater resistance variation across the operating temperature range. Select based on circuit tolerance requirements.

Q: What packaging formats are available?

A: The Ohmite 45F220 and Vishay Dale ALSR05220R0FE12 are supplied in Bulk packaging. The Vishay Dale RS005220R0FS73 is supplied in Cut Tape (CT) format, suitable for automated pick-and-place assembly.