Ohmite 42JR20 Equivalent & Substitute Parts

Part Overview

The Ohmite 42JR20 is a 200 mOhms ±5% 2W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is designed for applications requiring precision low-resistance dissipation in compact form factors. The part is currently active in production. Substitute parts are identified to address packaging preferences, compliance requirements, and inventory availability while maintaining identical electrical and mechanical specifications.

Substiute Parts

42JR20

OhmiteIn Stock: 100642JR20 Datasheet

Current PartRFQ

42JR20E

OhmiteIn Stock: 101642JR20E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 42JR20E is classified as a parametric equivalent to the 42JR20. Substitution eligibility is determined by the following criteria:

• Resistance value: 200 mOhms (identical)
• Tolerance: ±5% (identical)
• Power rating: 2W (identical)
• Composition: Wirewound (identical)
• Package: Axial (identical)
• Physical dimensions: 0.220" Dia x 0.406" L (identical)
• Temperature coefficient: ±90ppm/°C (identical)
• Number of terminations: 2 (identical)

The 42JR20E differs from the main part in packaging format (Bulk vs. standard), RoHS compliance status, and operating temperature specification. These differences do not affect electrical or mechanical interchangeability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 42JR20 and 42JR20E are active production components from Ohmite with identical electrical and mechanical specifications. Selection between these parts should be based on the following criteria:

• RoHS Compliance Requirements: The 42JR20E is RoHS Compliant, while the 42JR20 is RoHS non-compliant. Applications subject to RoHS directives must use the 42JR20E.
• Operating Temperature Specification: The 42JR20E provides explicit operating temperature range (-55°C ~ 275°C). Use the 42JR20E when temperature range documentation is required for design validation.
• Packaging Format: The 42JR20E is supplied in Bulk packaging, while the 42JR20 uses standard packaging. Select based on procurement and assembly requirements.
• Inventory Availability: Both parts maintain active stock levels (42JR20: 907 Pcs; 42JR20E: 957 Pcs).

Frequently Asked Questions (FAQ)

Q: Can the 42JR20E be used as a direct replacement for the 42JR20 in existing designs?

A: Yes. Both parts are electrically and mechanically identical with respect to resistance value, tolerance, power rating, composition, package type, and physical dimensions. The 42JR20E can be substituted without circuit redesign.

Q: What is the difference between the 42JR20 and 42JR20E?

A: The primary differences are RoHS compliance status (42JR20E is compliant; 42JR20 is non-compliant), packaging format (42JR20E is Bulk; 42JR20 is standard), and operating temperature specification (42JR20E specifies -55°C ~ 275°C; 42JR20 does not specify). Electrical and mechanical parameters are identical.

Q: Which part should be selected for new designs?

A: The 42JR20E is recommended for new designs due to RoHS compliance and explicit operating temperature specification, unless legacy component specifications require the 42JR20.

Q: Are there any thermal or frequency limitations for these resistors?

A: Both parts have a temperature coefficient of ±90ppm/°C. The 42JR20E specifies an operating temperature range of -55°C ~ 275°C. Wirewound construction provides stable performance across the specified temperature range.

Q: Does packaging format affect electrical performance?

A: No. Bulk packaging (42JR20E) and standard packaging (42JR20) do not affect electrical or mechanical performance. Packaging selection is based on procurement, storage, and assembly workflow requirements.