RC12KB4K70 Equivalent & Substitute Parts

Part Overview

The RC12KB4K70 is a 4.7 kOhms ±10% 0.5W 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 part is classified as obsolete, making identification of suitable substitutes necessary for ongoing design support and procurement continuity.

Substiute Parts

RC12KB4K70

Stackpole Electronics IncIn Stock: 820RC12KB4K70 Datasheet

Current PartRFQ

ASRM12JB4K70

Stackpole Electronics IncIn Stock: 1194ASRM12JB4K70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC12KB4K70 is determined by the following critical parameters:

• Resistance Value: Must be 4.7 kOhms
• Power Rating: Must be 0.5W (1/2W) minimum
• Package Type: Must be Axial for mechanical and electrical compatibility
• Operating Temperature Range: Must encompass or exceed -55°C to 125°C
• Tolerance: May be equal or tighter than ±10%

The ASRM12JB4K70 meets all substitution criteria. While it employs metal film composition instead of carbon composition, it maintains identical resistance, power rating, and axial package configuration. The tighter ±5% tolerance and extended operating temperature range to 155°C provide enhanced performance characteristics suitable for the RC12KB4K70 application space.

Parameter Comparison

Engineering Selection Recommendations

The ASRM12JB4K70 is the qualified substitute for the obsolete RC12KB4K70. Selection is supported by:

• Product Status: The substitute is active and in production, ensuring long-term availability and supply chain stability.
• Electrical Equivalence: Identical resistance value and power rating maintain circuit functionality.
• Package Compatibility: Axial configuration ensures direct mechanical and electrical fit in existing PCB layouts.
• Enhanced Specifications: Tighter tolerance (±5% vs ±10%) and extended temperature range (-55°C to 155°C vs -55°C to 125°C) provide performance margin.
• Compliance: Both parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the ASRM12JB4K70 be used as a direct replacement for the RC12KB4K70?

A: Yes. Both resistors share identical resistance value (4.7 kOhms), power rating (0.5W), and axial package configuration. The substitute's tighter tolerance and extended operating temperature range are compatible with applications designed for the original part.

Q: What is the difference between carbon composition and metal film resistors?

A: Carbon composition resistors (RC12KB4K70) use a carbon-based resistive element, while metal film resistors (ASRM12JB4K70) use a thin metal film. Metal film resistors typically offer tighter tolerance, lower noise, and better temperature stability. Both types are suitable for general-purpose applications.

Q: Does the substitute part fit the same PCB footprint?

A: Yes. Both parts use axial packaging with 2 terminations. The ASRM12JB4K70 has slightly smaller physical dimensions (0.118" Dia x 0.354" L vs 0.142" Dia x 0.374" L), ensuring compatibility with existing through-hole layouts.

Q: Is the ASRM12JB4K70 available in the same packaging format?

A: The substitute is supplied in bulk packaging, whereas the original part packaging format is not specified in the provided data. Confirm packaging requirements with your procurement department.

Q: What is the temperature coefficient difference?

A: The RC12KB4K70 temperature coefficient is not specified. The ASRM12JB4K70 has a temperature coefficient of 0/-1800 ppm/°C, indicating stable performance across the operating temperature range.