RC12KB220R Equivalent & Substitute Parts

Part Overview

The RC12KB220R is a 220 Ohms ±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 equivalent substitutes necessary for ongoing applications and new designs requiring this resistance value and power rating.

Substiute Parts

RC12KB220R

Stackpole Electronics IncIn Stock: 860RC12KB220R Datasheet

Current PartRFQ

ASRM12JB220R

Stackpole Electronics IncIn Stock: 1034ASRM12JB220R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC12KB220R is based on the following critical parameters:

• Resistance Value: 220 Ohms (exact match required)
• Power Rating: 0.5W minimum (1/2W)
• Package Type: Axial through-hole configuration
• Tolerance: ±10% or better (tighter tolerance acceptable)
• Operating Temperature Range: Must support -55°C to 125°C minimum
• Compliance: ROHS3 and REACH compliance maintained

The ASRM12JB220R qualifies as a direct substitute by meeting all critical electrical and mechanical parameters while offering improved tolerance (±5%) and an extended operating temperature range (-55°C to 155°C).

Parameter Comparison

Engineering Selection Recommendations

The ASRM12JB220R is the recommended substitute for the obsolete RC12KB220R. Both parts are manufactured by Stackpole Electronics Inc and maintain ROHS3 compliance. The substitute offers the following advantages:

• Active Product Status: The ASRM12JB220R is currently in active production, ensuring long-term availability and supply chain stability.
• Improved Tolerance: ±5% tolerance provides tighter resistance accuracy compared to the original ±10%.
• Extended Temperature Range: Operating range of -55°C to 155°C exceeds the original specification, providing greater thermal margin.
• Enhanced Features: Flame retardant coating and safety designation provide additional protection characteristics.
• Identical Electrical Performance: Both parts deliver 0.5W power rating at 220 Ohms with pulse withstanding capability.
• Same Package Configuration: Axial through-hole package ensures mechanical compatibility in existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can the ASRM12JB220R be used as a direct replacement for the RC12KB220R?

A: Yes. Both resistors share identical resistance value (220 Ohms), power rating (0.5W), and axial package configuration. The substitute meets or exceeds all electrical and mechanical parameters of the original part.

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

A: The RC12KB220R uses carbon composition construction, while the ASRM12JB220R uses metal film construction. Metal film resistors typically offer tighter tolerance, lower noise, and better temperature stability. Both compositions are suitable for general-purpose applications.

Q: Does the improved tolerance of the ASRM12JB220R affect circuit compatibility?

A: No. The ±5% tolerance of the substitute is tighter than the original ±10%, meaning the actual resistance value will be closer to the nominal 220 Ohms. This improvement maintains backward compatibility and may enhance circuit performance.

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

A: The ASRM12JB220R operates to 155°C, exceeding the original 125°C maximum. Both parts are rated for -55°C minimum. The extended upper temperature limit of the substitute provides additional thermal margin without compromising performance.

Q: Is the axial package dimension identical between the two parts?

A: The packages are both axial through-hole configuration. The RC12KB220R measures 0.142" Dia x 0.374" L, while the ASRM12JB220R measures 0.118" Dia x 0.354" L. Both fit standard 0.1" pitch PCB hole spacing used for axial resistors.

Q: Do both parts maintain the same compliance certifications?

A: Yes. Both the RC12KB220R and ASRM12JB220R are ROHS3 compliant and REACH unaffected, ensuring regulatory compliance in regulated applications.