RC12KB1M00 Equivalent & Substitute Parts

Part Overview

The RC12KB1M00 is a 1 MOhm ±10% 0.5W axial through-hole 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 currently obsolete, making identification of suitable substitute components essential for ongoing maintenance, repair, and legacy system support.

Substiute Parts

RC12KB1M00

Stackpole Electronics IncIn Stock: 752RC12KB1M00 Datasheet

Current PartRFQ

ASRM12JT1M00

Stackpole Electronics IncIn Stock: 819ASRM12JT1M00 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC12KB1M00 is determined by the following critical parameters:

Electrical Compatibility: Resistance value (1 MOhm) and power rating (0.5W) must remain constant. Tolerance may be tightened from ±10% to ±5% without functional degradation, as this represents improved precision.

Package Compatibility: Axial through-hole package format must be maintained to ensure mechanical fit and soldering compatibility with existing PCB layouts.

Thermal Performance: Operating temperature range must support the application's environmental requirements. The substitute part's extended range (-55°C to 155°C) exceeds the original specification.

Composition Consideration: While the original uses carbon composition, metal film composition is acceptable as a substitute provided all electrical and mechanical parameters align. Metal film construction offers improved stability and tighter tolerance control.

Compliance Requirements: Both parts maintain ROHS3 compliance and EAR99 ECCN classification, ensuring regulatory consistency.

Parameter Comparison

Engineering Selection Recommendations

The ASRM12JT1M00 serves as the direct substitute for the obsolete RC12KB1M00. Both components are manufactured by Stackpole Electronics Inc and maintain identical resistance and power rating specifications. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The ASRM12JT1M00 offers improved tolerance (±5% versus ±10%), enhanced temperature stability through specified temperature coefficient characteristics, and an extended operating temperature range. The metal film construction with flame retardant coating provides superior performance characteristics compared to the original carbon composition design.

Physical dimensions differ slightly, with the substitute part measuring 0.118" diameter by 0.354" length compared to the original 0.142" by 0.374". This dimensional reduction is compatible with standard axial through-hole PCB layouts and does not present mechanical installation constraints.

Both parts maintain identical regulatory compliance status (ROHS3 compliant, EAR99 ECCN classification), ensuring no compliance-related barriers to substitution.

Frequently Asked Questions (FAQ)

Q: Can the ASRM12JT1M00 directly replace the RC12KB1M00 in existing designs?

A: Yes. Both components share identical resistance value (1 MOhm) and power rating (0.5W), with axial through-hole package compatibility. The substitute part's tighter tolerance and extended temperature range represent performance improvements without functional incompatibility.

Q: What is the significance of the tolerance change from ±10% to ±5%?

A: Tighter tolerance improves circuit precision and reduces component-to-component variation. This change is beneficial and does not create backward compatibility issues. Circuits designed for ±10% tolerance operate correctly with ±5% components.

Q: Are there physical installation differences between these parts?

A: The ASRM12JT1M00 is slightly smaller (0.118" diameter versus 0.142" diameter). Both maintain standard axial through-hole lead spacing and are compatible with existing PCB hole patterns and soldering processes.

Q: Why does the substitute part specify a temperature coefficient while the original does not?

A: The ASRM12JT1M00 metal film construction provides measurable temperature stability characteristics (0 / -1800 ppm/°C). The original carbon composition part did not include this specification. The substitute's defined temperature coefficient indicates superior thermal performance.

Q: Is the extended operating temperature range (-55°C to 155°C) relevant for substitution?

A: The extended range ensures the substitute part functions across the original specification range (-55°C to 125°C) and beyond. This provides additional design margin and is not a limiting factor for substitution.

Q: Do both parts maintain the same regulatory compliance status?

A: Yes. Both the RC12KB1M00 and ASRM12JT1M00 are ROHS3 compliant and classified as EAR99 for export control purposes, ensuring consistent regulatory treatment.