B8J40R Equivalent & Substitute Parts

Part Overview

The B8J40R is a 40 Ohm, 8W 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 887 units in stock. Substitute parts are identified to address packaging preferences, compliance requirements, and inventory availability while maintaining identical electrical and mechanical specifications.

Substiute Parts

B8J40R

OhmiteIn Stock: 955B8J40R Datasheet

Current PartRFQ

B8J40RE

OhmiteIn Stock: 872B8J40RE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the B8J40R is determined by matching the following critical parameters:

• Resistance value: 40 Ohms
• Tolerance: ±5%
• Power rating: 8W
• Composition: Wirewound
• Package type: Axial
• Physical dimensions: 0.313" Dia x 1.000" L
• Temperature coefficient: ±260ppm/°C
• Number of terminations: 2
• Features: Flame Retardant Coating, Safety

The B8J40RE meets all electrical and mechanical requirements for direct substitution. The primary difference lies in packaging configuration (Bulk versus standard packaging) and RoHS compliance status, which do not affect functional performance in the application circuit.

Parameter Comparison

Engineering Selection Recommendations

The B8J40R and B8J40RE are electrically and mechanically identical components. Selection between them should be based on the following criteria:

B8J40R is appropriate for applications where RoHS non-compliant components are acceptable and standard packaging is preferred. Current inventory of 887 units supports immediate availability.

B8J40RE is appropriate for applications requiring ROHS3 compliance or bulk packaging configurations. This variant maintains all electrical specifications while meeting enhanced environmental compliance standards. Inventory of 794 units is available.

Both parts are active products from Ohmite's Brown Devil® 200 series and are suitable for direct substitution in circuit designs requiring 40 Ohm, 8W axial wirewound resistors.

Frequently Asked Questions (FAQ)

Q: Can B8J40RE replace B8J40R in my circuit design?

A: Yes. The B8J40RE is a direct electrical and mechanical substitute. All critical parameters—resistance value, tolerance, power rating, composition, package type, and physical dimensions—are identical. The parts differ only in packaging format and RoHS compliance status, neither of which affects circuit performance.

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

A: Packaging format affects order quantities and shipping configurations but does not impact component performance or specifications. Bulk packaging (B8J40RE) is typically used for high-volume procurement, while standard packaging (B8J40R) is used for smaller orders.

Q: Does RoHS compliance affect the electrical performance of these resistors?

A: No. RoHS compliance relates to material composition and environmental standards, not electrical characteristics. Both B8J40R and B8J40RE deliver identical electrical performance. Selection between them depends on regulatory requirements for your application or end market.

Q: Are the physical dimensions identical between B8J40R and B8J40RE?

A: Yes. Both parts measure 0.313" diameter by 1.000" length (7.94mm x 25.40mm). They are mechanically interchangeable in PCB layouts and through-hole applications.

Q: What does Moisture Sensitivity Level (MSL) indicate?

A: MSL rating indicates the component's sensitivity to moisture during storage and handling. B8J40R is rated "Not Applicable," while B8J40RE is rated MSL 1 (Unlimited), meaning it can be stored indefinitely without moisture control measures. This does not affect electrical performance in normal operating conditions.