RC12KB220K Equivalent & Substitute Parts

Part Overview

The RC12KB220K is a 220 kOhms ±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

RC12KB220K

Stackpole Electronics IncIn Stock: 1029RC12KB220K Datasheet

Current PartRFQ

ASRM1JA220K

Stackpole Electronics IncIn Stock: 1048ASRM1JA220K Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC12KB220K is determined by the following critical parameters:

Resistance Value: The substitute must maintain 220 kOhms nominal resistance to ensure circuit functionality.

Package Type: Axial through-hole configuration is required for mechanical and electrical compatibility with existing PCB layouts.

Power Rating: The substitute must meet or exceed the 0.5W power dissipation requirement. Higher power ratings are acceptable and provide additional thermal margin.

Tolerance: The original ±10% tolerance establishes the acceptable resistance variation. Substitutes with tighter tolerances (±5%) are compatible and provide improved accuracy.

Operating Temperature Range: The substitute must support the -55°C to 125°C operating window or a broader range.

Compliance: RoHS3 compliance and REACH unaffected status ensure regulatory alignment.

The ASRM1JA220K qualifies as a direct substitute based on these parameters, offering improved specifications in tolerance, power rating, and temperature range while maintaining identical resistance value and axial package configuration.

Parameter Comparison

Engineering Selection Recommendations

The ASRM1JA220K is the qualified substitute for the obsolete RC12KB220K. Selection is based on the following engineering criteria:

Product Availability: The RC12KB220K is obsolete. The ASRM1JA220K is active and maintains current manufacturing status, ensuring long-term supply chain viability.

Regulatory Compliance: Both components are ROHS3 compliant and REACH unaffected, meeting current environmental and safety standards.

Electrical Compatibility: Identical 220 kOhms resistance value and axial package configuration ensure direct functional replacement in existing circuits.

Performance Enhancement: The ASRM1JA220K provides superior specifications including tighter ±5% tolerance, doubled 1W power rating, and extended -55°C to 155°C operating temperature range.

Mechanical Fit: Both components feature axial through-hole configuration with compatible lead spacing for PCB mounting.

Frequently Asked Questions (FAQ)

Q: Can the ASRM1JA220K directly replace the RC12KB220K without circuit modification?

A: Yes. Both components share identical 220 kOhms resistance value and axial package configuration. The substitute's improved tolerance and power rating provide enhanced performance without requiring design changes.

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

A: The main differences are composition (carbon composition vs. metal film), tolerance (±10% vs. ±5%), power rating (0.5W vs. 1W), and product status (obsolete vs. active). The ASRM1JA220K offers superior specifications while maintaining electrical compatibility.

Q: Are there any thermal considerations when substituting these parts?

A: The ASRM1JA220K supports an extended operating temperature range (-55°C to 155°C) compared to the RC12KB220K (-55°C to 125°C). This provides additional thermal margin in applications operating near the upper temperature limit.

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

A: Metal film resistors typically exhibit lower noise and better frequency response characteristics than carbon composition resistors. For DC and low-frequency applications, this difference is negligible. For high-frequency or precision analog circuits, the metal film composition may provide improved performance.

Q: Are both components available in the same packaging format?

A: Yes. Both the RC12KB220K and ASRM1JA220K use axial through-hole packaging, ensuring mechanical compatibility with existing PCB layouts and assembly processes.