CB3JB7R50 Equivalent & Substitute Parts

Part Overview

The CB3JB7R50 is a 7.5 Ohms ±5% 3W axial wirewound resistor manufactured by Stackpole Electronics Inc. This through-hole component features flame-proof and moisture-resistant construction with safety-rated design, suitable for applications requiring reliable power dissipation in harsh environments. The part maintains Active product status with 905 units currently in stock. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

CB3JB7R50

Stackpole Electronics IncIn Stock: 986CB3JB7R50 Datasheet

Current PartRFQ

PNP300JR-73-7R5

YAGEOIn Stock: 12846PNP300JR-73-7R5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CB3JB7R50 are qualified based on the following critical parameters that determine functional equivalence:

• Resistance value: 7.5 Ohms (exact match required)
• Tolerance: ±5% (matching tolerance band)
• Power rating: 3W (identical power dissipation capability)
• Composition: Wirewound (same construction type)
• Package: Axial (identical form factor and termination style)
• Compliance: ROHS3 Compliant (regulatory alignment)

The PNP300JR-73-7R5 from YAGEO meets all core electrical and mechanical substitution criteria. Differences in physical dimensions, temperature coefficient specification, and maximum operating temperature are noted but do not preclude functional substitution in applications where the CB3JB7R50 specifications are met.

Parameter Comparison

Engineering Selection Recommendations

Both the CB3JB7R50 and PNP300JR-73-7R5 are Active status components with ROHS3 compliance and REACH Unaffected designation, meeting current regulatory requirements. Selection between these parts should be based on application-specific constraints:

The CB3JB7R50 provides extended operating temperature range (-55°C to 275°C) and specified temperature coefficient (±200ppm/°C), making it suitable for high-temperature or thermally demanding applications. The PNP300JR-73-7R5 offers a more compact physical footprint (4.60mm x 11.50mm versus 8.00mm x 22.00mm) with higher inventory availability (12,790 units), advantageous for space-constrained designs or high-volume procurement scenarios. Both parts satisfy the core electrical requirements of 7.5 Ohms ±5% at 3W with wirewound construction and axial packaging.

Frequently Asked Questions (FAQ)

Q: Can the PNP300JR-73-7R5 directly replace the CB3JB7R50 in all applications?

A: Direct replacement is valid for applications operating within the PNP300JR-73-7R5 temperature range (-40°C to 200°C). Applications requiring operation below -40°C or above 200°C must retain the CB3JB7R50. Both parts meet the 7.5 Ohms ±5% 3W electrical specification.

Q: What are the physical dimension differences between these parts?

A: The CB3JB7R50 measures 8.00mm x 22.00mm (0.315" Square x 0.866" L), while the PNP300JR-73-7R5 measures 4.60mm x 11.50mm (0.181" Dia x 0.453" L). The YAGEO part is significantly smaller and may require PCB layout verification for clearance and thermal management considerations.

Q: Are both parts RoHS compliant?

A: Yes, both the CB3JB7R50 and PNP300JR-73-7R5 are ROHS3 Compliant with REACH Unaffected status, meeting current environmental and regulatory standards.

Q: What is the difference in temperature coefficient between these parts?

A: The CB3JB7R50 specifies ±200ppm/°C temperature coefficient. The PNP300JR-73-7R5 does not provide a temperature coefficient specification in the available data. Applications requiring controlled temperature stability should reference the CB3JB7R50 specification.

Q: Which part should be selected for high-volume production?

A: The PNP300JR-73-7R5 offers significantly higher inventory availability (12,790 units versus 905 units) and is packaged in Cut Tape format, supporting automated assembly processes. Selection should also consider application temperature requirements and physical space constraints.