42J12R Equivalent & Substitute Parts

Part Overview

The 42J12R is a 12 Ohm, 2W axial wirewound resistor manufactured by Ohmite as part of the Ohmicone® 40 series. This through-hole component is designed for applications requiring precision resistance with a ±5% tolerance and stable performance across operating conditions. The part is currently in active production status. Substitute parts are identified to address packaging preferences, compliance requirements, or inventory availability while maintaining identical electrical and mechanical specifications.

Substiute Parts

42J12R

OhmiteIn Stock: 118242J12R Datasheet

Current PartRFQ

42J12RE

OhmiteIn Stock: 87242J12RE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 42J12R is determined by matching the following critical parameters:

• Resistance value: 12 Ohms
• Tolerance: ±5%
• Power rating: 2W
• Composition: Wirewound
• Package configuration: Axial
• Temperature coefficient: ±20ppm/°C
• Physical dimensions: 0.220" Dia x 0.406" L (5.60mm x 10.30mm)
• Termination count: 2

The 42J12RE meets all electrical and mechanical requirements for direct substitution. The primary difference between these parts is packaging format and RoHS compliance status, which do not affect functional performance in equivalent circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both 42J12R and 42J12RE are active production components from Ohmite with identical electrical performance and mechanical compatibility. Selection between these parts should be based on:

• RoHS compliance requirements: The 42J12RE is ROHS3 compliant, while the 42J12R is RoHS non-compliant. Applications subject to RoHS directives must use the 42J12RE.
• Packaging format: The 42J12R uses standard packaging, while the 42J12RE is supplied in bulk packaging. Bulk packaging may be preferred for high-volume manufacturing operations.
• Inventory availability: Current stock levels differ between variants. The 42J12R has 1164 units available, while the 42J12RE has 785 units available.

Both parts carry identical export classification (EAR99) and tariff codes (8533.21.0080).

Frequently Asked Questions (FAQ)

Q: Can 42J12RE be used as a direct replacement for 42J12R?

A: Yes. Both parts are electrically and mechanically identical, with matching resistance, tolerance, power rating, composition, package type, temperature coefficient, and physical dimensions. The primary differences are packaging format and RoHS compliance status.

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

A: Standard packaging (42J12R) and bulk packaging (42J12RE) refer to the quantity and presentation format supplied by the manufacturer. Both contain the same component. Bulk packaging is typically used for high-volume assembly operations.

Q: Does RoHS compliance affect component performance?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical or mechanical performance. Both compliant and non-compliant versions of this resistor meet identical functional specifications.

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

A: Both parts operate with a temperature coefficient of ±20ppm/°C. No operating temperature range or frequency limitations are specified in the provided data.

Q: Can these axial resistors be used in surface-mount applications?

A: No. Both 42J12R and 42J12RE are through-hole axial components designed for insertion into PCB holes. They are not suitable for surface-mount assembly without mechanical adaptation.