B12J40R Equivalent & Substitute Parts

Part Overview

The B12J40R is a 40 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 reliable power dissipation in compact form factors. The part is currently active in production with 956 units in stock. Substitute parts are identified to address inventory availability, compliance requirements, or specific application needs while maintaining electrical and mechanical compatibility.

Substiute Parts

B12J40R

OhmiteIn Stock: 992B12J40R Datasheet

Current PartRFQ

B12J40RE

OhmiteIn Stock: 775B12J40RE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the B12J40R is determined by strict parametric matching across electrical and mechanical specifications. The following criteria establish compatibility:

Electrical Parameters (Must Match):

• Resistance value: 40 Ohms
• Tolerance: ±5%
• Power rating: 12W
• Temperature coefficient: ±260ppm/°C

Mechanical Parameters (Must Match):

• Package type: Axial
• Physical dimensions: 0.313" Dia x 1.750" L (7.94mm x 44.45mm)
• Number of terminations: 2

Construction Parameters (Must Match):

• Composition: Wirewound
• Features: Flame retardant coating, safety construction
• Series: Brown Devil® 200

The B12J40RE meets all parametric requirements for direct substitution with the B12J40R.

Parameter Comparison

Engineering Selection Recommendations

Both B12J40R and B12J40RE are active production components from Ohmite's Brown Devil® 200 series with identical electrical and mechanical specifications. Selection between these parts should be based on regulatory compliance requirements:

The B12J40RE offers ROHS3 compliance and REACH unaffected status, making it suitable for applications subject to European Union environmental directives. The B12J40R, while RoHS non-compliant, remains available for applications without such regulatory constraints. Both parts maintain equivalent performance characteristics and are suitable for direct substitution in axial wirewound resistor applications requiring 40 Ohm, 12W power dissipation with flame retardant construction.

Frequently Asked Questions (FAQ)

Q: Can B12J40RE be used as a direct replacement for B12J40R?

A: Yes. Both parts share identical electrical specifications (40 Ohms, ±5%, 12W), construction (wirewound with flame retardant coating), and mechanical dimensions (0.313" Dia x 1.750" L). The primary difference is regulatory compliance status.

Q: What is the difference between B12J40R and B12J40RE?

A: The B12J40RE is ROHS3 compliant and REACH unaffected, while the B12J40R is RoHS non-compliant. All other electrical, mechanical, and performance parameters are identical.

Q: Are these parts interchangeable in PCB layouts?

A: Yes. Both parts use identical axial packaging with 0.313" diameter and 1.750" length, requiring no changes to board layout, hole spacing, or component footprints.

Q: Which part should be selected for new designs?

A: Selection depends on end-use regulatory requirements. For applications requiring RoHS3 compliance, specify B12J40RE. For applications without such constraints, either part is acceptable based on availability.

Q: What is the temperature coefficient significance?

A: The ±260ppm/°C temperature coefficient indicates resistance value drift with temperature changes. Both substitute parts maintain this specification, ensuring consistent thermal performance across operating ranges.