B12J300 Equivalent & Substitute Parts Reference

Part Overview

The B12J300 is a 300 Ohm, 12W axial wirewound resistor manufactured by Ohmite as part of the Brown Devil® 200 series. This through-hole component features flame retardant coating and safety construction, designed for applications requiring high power dissipation in a compact axial package. The part is currently active in production with 766 units in stock. Substitute parts are identified to address packaging variations and compliance requirements while maintaining identical electrical and mechanical specifications.

Substiute Parts

B12J300

OhmiteIn Stock: 847B12J300 Datasheet

Current PartRFQ

B12J300E

OhmiteIn Stock: 1124B12J300E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The B12J300E is classified as a parametric equivalent to the B12J300. Substitution is valid based on the following criteria:

• Identical resistance value: 300 Ohms
• Identical tolerance: ±5%
• Identical power rating: 12W
• Identical composition: Wirewound
• Identical package type: Axial
• Identical physical dimensions: 0.313" Dia x 1.750" L (7.94mm x 44.45mm)
• Identical temperature coefficient: ±260ppm/°C
• Identical features: Flame Retardant Coating, Safety
• Identical number of terminations: 2
• Same manufacturer: Ohmite
• Same series: Brown Devil® 200

The primary difference between these parts is packaging format (tape/reel versus bulk) and RoHS compliance status, which do not affect electrical or mechanical interchangeability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both B12J300 and B12J300E are active production parts from Ohmite with identical electrical and mechanical specifications. Selection between these parts should be based on compliance requirements:

• B12J300: Select for applications where RoHS non-compliant components are acceptable or required by specification.
• B12J300E: Select for applications requiring ROHS3 compliance or when REACH compliance status is a procurement requirement.

Both parts are suitable for direct substitution in circuit designs where the 300 Ohm, 12W axial wirewound resistor specification is called out. The choice between them is driven by regulatory and supply chain requirements rather than electrical performance.

Frequently Asked Questions (FAQ)

Q: Can B12J300E replace B12J300 in my circuit? A: Yes. Both parts have identical electrical specifications (300 Ohms, ±5%, 12W), identical physical dimensions, and identical construction (wirewound, axial, flame retardant). They are electrically and mechanically interchangeable.

Q: What is the difference between B12J300 and B12J300E? A: The primary differences are packaging format and RoHS compliance status. B12J300E is ROHS3 compliant, while B12J300 is RoHS non-compliant. Both parts are functionally identical in circuit applications.

Q: Does the RoHS compliance difference affect performance? A: No. RoHS compliance relates to material composition and manufacturing process, not electrical or thermal performance. Both parts meet the same electrical specifications and operating parameters.

Q: Are the physical dimensions identical? A: Yes. Both parts measure 0.313" diameter by 1.750" length (7.94mm x 44.45mm) and use the same axial package configuration.

Q: Which part should I specify for new designs? A: Specify B12J300E for new designs if ROHS3 compliance is required by your application or regulatory environment. Both parts are active and in stock.

Q: Can I mix B12J300 and B12J300E in the same assembly? A: Yes. Since they are electrically and mechanically identical, mixing these parts in the same assembly does not affect circuit performance or reliability.