Ohmite 42J300 Equivalent & Substitute Parts

Part Overview

The Ohmite 42J300 is a 300 Ohms ±5% 2W through-hole resistor with axial wirewound composition, part of the Ohmicone® 40 series. This component is currently active in production and maintains 924 pieces in new original stock. The 42J300 is classified as RoHS non-compliant, which may necessitate identification of compliant alternatives for applications subject to RoHS regulations or procurement requirements mandating RoHS3 compliance.

Substiute Parts

42J300

OhmiteIn Stock: 101142J300 Datasheet

Current PartRFQ

42J300E

OhmiteIn Stock: 104642J300E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 42J300E qualifies as a parametric equivalent based on identical electrical and mechanical specifications: 300 Ohms resistance, ±5% tolerance, 2W power rating, wirewound composition, axial package configuration, 0.220" Dia x 0.406" L dimensions, ±20ppm/°C temperature coefficient, and two terminations. The primary distinction between the main part and substitute is RoHS compliance status and packaging format. The 42J300E is RoHS3 compliant and supplied in bulk packaging, whereas the 42J300 is RoHS non-compliant with standard packaging. Both parts maintain identical electrical performance and physical form factor, making them interchangeable from a functional standpoint within the specified parameter constraints.

Parameter Comparison

Engineering Selection Recommendations

Selection between the 42J300 and 42J300E depends on regulatory and procurement requirements. The 42J300E is the appropriate choice for applications requiring RoHS3 compliance or where procurement specifications mandate RoHS-compliant components. Both parts are active products from Ohmite with identical electrical characteristics, mechanical dimensions, and performance specifications. The 42J300E offers higher inventory availability at 1031 pieces compared to 924 pieces for the 42J300. Packaging format differs between the two variants: the 42J300 uses standard packaging while the 42J300E is supplied in bulk format. From a functional and electrical standpoint, either part satisfies identical circuit requirements within the specified parameter set.

Frequently Asked Questions (FAQ)

Q: Are the 42J300 and 42J300E electrically identical? A: Yes. Both parts share identical resistance (300 Ohms), tolerance (±5%), power rating (2W), temperature coefficient (±20ppm/°C), and wirewound composition. Electrical performance is equivalent.

Q: What is the primary difference between these two parts? A: The 42J300E is RoHS3 compliant while the 42J300 is RoHS non-compliant. The 42J300E is supplied in bulk packaging format. All other specifications remain identical.

Q: Can I use the 42J300E as a direct replacement for the 42J300? A: Yes, from an electrical and mechanical standpoint. The 42J300E is a direct functional equivalent with identical dimensions (0.220" Dia x 0.406" L), axial package configuration, and two terminations. Selection depends on compliance requirements and packaging preferences.

Q: Does packaging format affect circuit performance? A: No. The difference between standard and bulk packaging is organizational only and does not affect component electrical characteristics or performance.

Q: Which part should I specify for new designs? A: Specify the 42J300E for new designs if RoHS3 compliance is required by your application or procurement standards. Both parts are active products with adequate inventory.