RC12KB4M70 Equivalent & Substitute Parts

Part Overview

The RC12KB4M70 is a 4.7 MOhms ±10% 0.5W axial through-hole resistor manufactured by Stackpole Electronics Inc. This carbon composition resistor features non-inductive and pulse withstanding characteristics, designed for applications requiring high resistance values with moderate tolerance specifications.

The RC12KB4M70 is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

RC12KB4M70

Stackpole Electronics IncIn Stock: 1212RC12KB4M70 Datasheet

Current PartRFQ

ASRM12JA4M70

Stackpole Electronics IncIn Stock: 1047ASRM12JA4M70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC12KB4M70 is determined by the following critical parameters:

• Resistance Value: Must be 4.7 MOhms
• Power Rating: Must be 0.5W (1/2W) minimum
• Package Type: Must be Axial configuration for through-hole mounting compatibility
• Tolerance: Acceptable range is ±10% or tighter (±5% is acceptable)
• Operating Temperature: Must support -55°C ~ 125°C minimum
• Compliance: Must maintain ROHS3 compliance and REACH unaffected status

The ASRM12JA4M70 meets all substitution criteria. While it uses metal film composition instead of carbon composition, it maintains the same resistance value, power rating, axial package, and exceeds the tolerance and temperature specifications of the original part.

Parameter Comparison

Engineering Selection Recommendations

The ASRM12JA4M70 is the qualified substitute for the RC12KB4M70. Selection is based on the following engineering criteria:

• Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.
• Active Product Status: The ASRM12JA4M70 is an active product with confirmed inventory availability (1031 Pcs), whereas the RC12KB4M70 is obsolete.
• Enhanced Specifications: The substitute provides tighter tolerance (±5% vs ±10%) and extended operating temperature range (-55°C ~ 155°C vs -55°C ~ 125°C), offering improved performance margins.
• Functional Equivalence: Both parts deliver identical resistance value and power rating in axial package configuration, maintaining circuit-level compatibility.

Frequently Asked Questions (FAQ)

Q: Can the ASRM12JA4M70 be used as a direct replacement for the RC12KB4M70?

A: Yes. Both parts share the same resistance value (4.7 MOhms), power rating (0.5W), and axial package configuration. The substitute meets or exceeds all critical electrical and mechanical parameters required for substitution.

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

A: Carbon composition resistors (RC12KB4M70) use a carbon-based resistive element, while metal film resistors (ASRM12JA4M70) use a thin metal film. Metal film resistors typically offer tighter tolerance, lower temperature coefficient, and better frequency response. Both types are suitable for DC and low-frequency AC applications.

Q: Does the tighter tolerance of the ASRM12JA4M70 (±5%) affect circuit design?

A: No. Tighter tolerance is a performance enhancement. If the original design accepted ±10% tolerance, a ±5% substitute will maintain or improve circuit accuracy without requiring design modifications.

Q: Are the physical dimensions compatible?

A: Both parts use axial package configuration. The ASRM12JA4M70 has slightly smaller dimensions (0.118" Dia x 0.354" L vs 0.142" Dia x 0.374" L), which is compatible with standard through-hole PCB layouts designed for axial resistors.

Q: What is the inventory status for these parts?

A: The RC12KB4M70 has 1115 Pcs in stock but is obsolete. The ASRM12JA4M70 has 1031 Pcs in stock and is an active product, ensuring long-term availability.

Q: Are both parts RoHS compliant?

A: Yes. Both the RC12KB4M70 and ASRM12JA4M70 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.