RC1KB4K70 Equivalent & Substitute Parts

Part Overview

The RC1KB4K70 is a 4.7 kOhms ±10% 1W through-hole axial resistor manufactured by Stackpole Electronics Inc. This carbon composition resistor features non-inductive and pulse-withstanding characteristics, with an operating temperature range of -55°C to 125°C. The product is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

RC1KB4K70

Stackpole Electronics IncIn Stock: 859RC1KB4K70 Datasheet

Current PartRFQ

ASRM1JA4K70

Stackpole Electronics IncIn Stock: 1227ASRM1JA4K70 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC1KB4K70 is based on the following critical parameters:

• Resistance value: 4.7 kOhms (exact match required)
• Power rating: 1W (minimum requirement)
• Package configuration: Axial through-hole (mechanical compatibility)
• Operating temperature range: Minimum -55°C to 125°C coverage
• Compliance certifications: ROHS3 compliance maintained

The ASRM1JA4K70 qualifies as a direct substitute based on matching resistance, power rating, and axial package configuration. While the substitute features improved tolerance (±5% versus ±10%) and extended operating temperature range (-55°C to 155°C), these represent enhanced specifications rather than deviations from the original design requirements.

Parameter Comparison

Engineering Selection Recommendations

The ASRM1JA4K70 is suitable for direct substitution of the RC1KB4K70 based on the following factors:

• Both components maintain ROHS3 compliance, satisfying regulatory requirements
• The substitute is classified as active product status, ensuring long-term availability and supply chain stability
• Resistance and power rating specifications are identical, preserving circuit functionality
• Axial package configuration remains unchanged, maintaining mechanical compatibility with existing PCB layouts
• The substitute's improved tolerance and extended temperature range provide enhanced performance margins without introducing incompatibility

Frequently Asked Questions (FAQ)

Q: Can the ASRM1JA4K70 be used as a direct replacement for the RC1KB4K70?

A: Yes. Both components share identical resistance values (4.7 kOhms), power ratings (1W), and axial package configurations. The substitute meets or exceeds all critical electrical and mechanical parameters required for substitution.

Q: What is the primary difference between these two resistors?

A: The RC1KB4K70 uses carbon composition construction with ±10% tolerance, while the ASRM1JA4K70 employs metal film construction with ±5% tolerance. The substitute also extends the operating temperature range to 155°C compared to the original 125°C maximum.

Q: Are there any compatibility concerns with PCB layout or mounting?

A: No. Both resistors use identical axial package configurations. The ASRM1JA4K70 has slightly smaller physical dimensions (4.00mm diameter × 11.00mm length versus 5.70mm × 14.30mm), which presents no mounting incompatibility for standard through-hole applications.

Q: Does the change from carbon composition to metal film affect circuit performance?

A: The metal film construction of the substitute provides improved tolerance accuracy and temperature stability. For applications where the original ±10% tolerance was acceptable, the ±5% tolerance of the substitute maintains backward compatibility while offering tighter performance specifications.

Q: Are both components RoHS compliant?

A: Yes. Both the RC1KB4K70 and ASRM1JA4K70 are ROHS3 compliant, meeting current environmental and regulatory standards.