45F22R Equivalent & Substitute Parts

Part Overview

The 45F22R is a 22 Ohm ±1% 5W axial wirewound through-hole resistor manufactured by Ohmite, part of 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 804 units in stock. Substitute parts are necessary to address supply chain flexibility, packaging preferences, compliance requirements, or operational temperature range needs across different application environments.

Substiute Parts

45F22R

OhmiteIn Stock: 90545F22R Datasheet

Current PartRFQ

45F22RE

OhmiteIn Stock: 73845F22RE Datasheet

DirectRFQ

ALSR0522R00FE12

Vishay DaleIn Stock: 1136ALSR0522R00FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 45F22R is determined by matching the following core electrical and mechanical parameters:

• Resistance value: 22 Ohms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Package configuration: Axial through-hole
• Number of terminations: 2

The identified substitute parts meet these core requirements. Secondary parameters such as temperature coefficient, operating temperature range, physical dimensions, RoHS compliance status, and packaging format (tape/reel vs. bulk) may vary within acceptable engineering tolerances and should be evaluated based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

45F22RE (Ohmite): This part is a direct Ohmite equivalent with identical electrical specifications and physical dimensions to the 45F22R. The primary distinction is RoHS compliance status; the 45F22RE is RoHS Compliant, whereas the 45F22R is non-compliant. Selection of 45F22RE is appropriate for applications requiring RoHS-compliant components or when supply of the original 45F22R is constrained. Operating temperature range is specified as -55°C ~ 275°C, providing extended high-temperature capability.

ALSR0522R00FE12 (Vishay Dale): This cross-manufacturer substitute meets all core electrical requirements with identical resistance, tolerance, and power rating. The ALSR series includes moisture-resistant construction, which may provide additional environmental protection in humid or corrosive applications. Physical dimensions are slightly smaller (0.312" Dia x 0.875" L vs. 0.343" Dia x 0.937" L), which may affect board layout compatibility. Temperature coefficient is ±30ppm/°C compared to ±20ppm/°C for the Ohmite parts, and operating temperature range extends to -65°C minimum. ROHS3 compliance is confirmed. This part is suitable for applications where cross-manufacturer sourcing is acceptable and moisture resistance is beneficial.

Frequently Asked Questions (FAQ)

Q: Can 45F22RE be used as a direct replacement for 45F22R?

A: Yes. Both parts share identical electrical specifications (22 Ohms ±1%, 5W wirewound) and physical dimensions (0.343" Dia x 0.937" L). The primary difference is RoHS compliance status. Functional performance in the circuit is equivalent.

Q: What is the significance of the temperature coefficient difference between 45F22R/45F22RE (±20ppm/°C) and ALSR0522R00FE12 (±30ppm/°C)?

A: Temperature coefficient indicates resistance value drift per degree Celsius change. The 45F22R and 45F22RE exhibit tighter temperature stability (±20ppm/°C) compared to the Vishay Dale part (±30ppm/°C). For precision applications with strict tolerance requirements across temperature ranges, the Ohmite parts are preferred. For general-purpose applications, the difference is typically negligible.

Q: Are there physical dimension constraints when substituting with ALSR0522R00FE12?

A: Yes. The ALSR0522R00FE12 has slightly smaller dimensions (0.312" Dia x 0.875" L) compared to the 45F22R (0.343" Dia x 0.937" L). While the smaller size generally poses no compatibility issues, board layout and mechanical clearance should be verified, particularly in space-constrained designs or where component positioning is critical.

Q: Which substitute part should be selected for RoHS-compliant applications?

A: Both 45F22RE (RoHS Compliant) and ALSR0522R00FE12 (ROHS3 Compliant) meet RoHS requirements. The 45F22RE is recommended for direct replacement due to identical specifications and dimensions. The ALSR0522R00FE12 is suitable if cross-manufacturer sourcing or moisture-resistant construction is required.

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

A: The 45F22R is supplied in standard packaging, while 45F22RE and ALSR0522R00FE12 are supplied in bulk format. Packaging format does not affect electrical or mechanical performance; selection depends on procurement volume requirements and inventory management practices.