RC14KB120R Equivalent & Substitute Parts

Part Overview

The RC14KB120R is a 120 Ohms ±10% 0.25W (1/4W) through-hole resistor manufactured by Stackpole Electronics Inc. This axial 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

RC14KB120R

Stackpole Electronics IncIn Stock: 901RC14KB120R Datasheet

Current PartRFQ

ASRM12JB120R

Stackpole Electronics IncIn Stock: 1047ASRM12JB120R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC14KB120R is determined by the following critical parameters:

• Resistance Value: Must be 120 Ohms
• Package Configuration: Must be Axial to ensure mechanical and electrical compatibility with existing PCB layouts
• Tolerance: The original ±10% tolerance establishes the acceptable accuracy range; substitutes with equal or tighter tolerance (±5% or better) are acceptable
• Power Rating: The original 0.25W rating establishes the minimum power dissipation capability; substitutes with equal or higher power ratings are acceptable
• Operating Temperature Range: Must encompass or exceed the original -55°C to 125°C range
• Composition Type: While the original uses carbon composition, metal film substitutes with equivalent or superior electrical characteristics are acceptable provided all other parameters are met

The ASRM12JB120R meets all substitution criteria with improved specifications in tolerance (±5%), power rating (0.5W), and operating temperature range (-55°C to 155°C).

Parameter Comparison

Engineering Selection Recommendations

The ASRM12JB120R is the designated manufacturer-recommended substitute for the RC14KB120R. This substitution is supported by:

• Identical Resistance Value: Both components provide 120 Ohms nominal resistance
• Axial Package Compatibility: Both use axial through-hole configuration, ensuring direct mechanical fit in existing PCB designs
• Improved Tolerance: The ±5% tolerance of the ASRM12JB120R provides tighter accuracy than the original ±10%, enhancing circuit performance
• Enhanced Power Rating: The 0.5W rating provides 100% additional power dissipation margin over the original 0.25W specification
• Extended Temperature Range: The -55°C to 155°C operating range exceeds the original specification, supporting broader environmental applications
• Active Product Status: The ASRM12JB120R is currently in active production, ensuring long-term availability and supply chain reliability
• Regulatory Compliance: Both components meet ROHS3 compliance requirements

Frequently Asked Questions (FAQ)

Q: Can the ASRM12JB120R be used as a direct replacement for the RC14KB120R?

A: Yes. Both components share identical resistance values (120 Ohms), axial package configuration, and operating temperature range overlap. The substitute offers improved tolerance and power rating specifications.

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

A: Carbon composition resistors use a carbon-based resistive element, while metal film resistors use a thin metal film. Metal film resistors typically offer tighter tolerance, lower noise, and better temperature stability. The ASRM12JB120R metal film construction provides superior performance characteristics compared to the original carbon composition design.

Q: Does the higher power rating of the ASRM12JB120R affect circuit operation?

A: No. A higher power rating indicates greater power dissipation capability. The substitute will operate safely in applications designed for the original 0.25W component, with additional thermal margin.

Q: Are there any size differences between these components?

A: Yes. The ASRM12JB120R has slightly larger dimensions (0.118" Dia x 0.354" L) compared to the RC14KB120R (0.094" Dia x 0.248" L). Both use axial configuration and standard through-hole spacing, but physical clearance should be verified in space-constrained applications.

Q: Is the ASRM12JB120R available in the same packaging as the RC14KB120R?

A: Both components use axial through-hole packaging. The ASRM12JB120R is supplied in bulk packaging, while the original RC14KB120R packaging format is not specified in the available data.