RC12JB120R Equivalent & Substitute Parts

Part Overview

The RC12JB120R is a 120 Ohms ±5% 0.5W through-hole axial resistor manufactured by Stackpole Electronics Inc. This carbon composition resistor features non-inductive and pulse withstanding characteristics, designed for applications requiring robust performance across industrial temperature ranges. The product is currently obsolete, making equivalent substitute parts necessary for ongoing maintenance, repair, and legacy system support.

Substiute Parts

RC12JB120R

Stackpole Electronics IncIn Stock: 936RC12JB120R Datasheet

Current PartRFQ

ASRM12JB120R

Stackpole Electronics IncIn Stock: 1047ASRM12JB120R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC12JB120R is determined by the following critical parameters:

• Resistance Value: 120 Ohms (exact match required)
• Tolerance: ±5% (acceptable range for functional equivalence)
• Power Rating: 0.5W minimum (equal or higher ratings acceptable)
• Package Type: Axial (mechanical and electrical compatibility)
• Number of Terminations: 2 (circuit connectivity requirement)
• Operating Temperature Range: Must support -55°C ~ 125°C minimum
• Regulatory Compliance: RoHS3 compliance maintained

The ASRM12JB120R meets all substitution criteria while offering enhanced specifications including metal film composition, flame retardant coating, and extended temperature capability to 155°C.

Parameter Comparison

Engineering Selection Recommendations

The ASRM12JB120R is the manufacturer-recommended substitute for the obsolete RC12JB120R. Both parts maintain identical electrical specifications (120 Ohms ±5%, 0.5W) and axial package configuration, ensuring direct circuit compatibility. The ASRM12JB120R is currently in active production status with confirmed inventory availability, addressing the obsolescence of the original part.

The substitute part offers enhanced reliability through metal film composition and flame retardant coating, while maintaining full RoHS3 compliance. The extended operating temperature range (-55°C ~ 155°C) provides additional thermal margin beyond the original specification (-55°C ~ 125°C), supporting broader application requirements without performance degradation.

Frequently Asked Questions (FAQ)

Q: Can the ASRM12JB120R be used as a direct replacement for RC12JB120R?

A: Yes. Both parts share identical resistance (120 Ohms), tolerance (±5%), power rating (0.5W), and axial package configuration. The ASRM12JB120R meets all electrical and mechanical requirements for direct substitution in existing circuits.

Q: What are the key differences between these two resistors?

A: The primary differences are composition (carbon composition vs. metal film), product status (obsolete vs. active), and operating temperature range (-55°C ~ 125°C vs. -55°C ~ 155°C). The ASRM12JB120R includes flame retardant coating and pulse withstanding features.

Q: Are there any package or footprint differences?

A: Both parts use axial package configuration with 2 terminations. Physical dimensions differ slightly: RC12JB120R measures 0.142" Dia x 0.374" L, while ASRM12JB120R measures 0.118" Dia x 0.354" L. These dimensional variations are within standard axial resistor tolerances and do not affect circuit board layout compatibility.

Q: Is the ASRM12JB120R RoHS compliant?

A: Yes. The ASRM12JB120R is ROHS3 compliant, matching the compliance status of the original RC12JB120R.

Q: Why is the RC12JB120R marked as obsolete?

A: The RC12JB120R has been discontinued by the manufacturer. The ASRM12JB120R represents the current active production equivalent, ensuring long-term availability and supply chain continuity.