RC12KB390R Equivalent & Substitute Parts

Part Overview

The RC12KB390R is a 390 Ohms ±10% 0.5W through-hole axial 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 substitute parts necessary for ongoing applications and new designs requiring this resistance value and power rating.

Substiute Parts

RC12KB390R

Stackpole Electronics IncIn Stock: 1093RC12KB390R Datasheet

Current PartRFQ

ASRM12JA390R

Stackpole Electronics IncIn Stock: 928ASRM12JA390R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC12KB390R is based on the following critical parameters:

• Resistance value: 390 Ohms (exact match required)
• Power rating: 0.5W minimum (1/2W)
• Package configuration: Axial through-hole
• Operating temperature range: Must accommodate -55°C to 125°C minimum
• Compliance: ROHS3 and REACH requirements

The ASRM12JA390R qualifies as a direct substitute because it maintains the same resistance value, power rating, and axial package configuration. While the substitute features improved tolerance (±5% versus ±10%) and metal film composition instead of carbon composition, these represent enhanced electrical characteristics suitable for the same circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The ASRM12JA390R is the recommended substitute for the obsolete RC12KB390R. Both parts are manufactured by Stackpole Electronics Inc and maintain ROHS3 compliance and REACH unaffected status. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The ASRM12JA390R provides superior tolerance specification (±5% versus ±10%) and an extended operating temperature range (-55°C to 155°C versus -55°C to 125°C), making it suitable for applications requiring the original RC12KB390R specifications while offering improved performance margins.

Frequently Asked Questions (FAQ)

Q: Can the ASRM12JA390R directly replace the RC12KB390R in existing designs?

A: Yes. Both parts share identical resistance values (390 Ohms), power ratings (0.5W), and axial package configurations. The substitute meets or exceeds all operating parameters of the original part.

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

A: The RC12KB390R uses carbon composition construction, while the ASRM12JA390R uses metal film construction. Metal film resistors typically offer tighter tolerance, lower noise, and better temperature stability. Both compositions are suitable for general-purpose circuit applications.

Q: Does the improved tolerance of the substitute part affect circuit compatibility?

A: No. The ±5% tolerance of the ASRM12JA390R is more stringent than the ±10% tolerance of the original part, meaning it will perform within tighter resistance specifications. This represents an improvement for circuit accuracy.

Q: Are there any physical dimension differences between these parts?

A: The ASRM12JA390R has slightly smaller dimensions (0.118" Dia x 0.354" L) compared to the RC12KB390R (0.142" Dia x 0.374" L). Both maintain axial package configuration and are compatible with standard through-hole PCB layouts.

Q: What is the packaging format for the substitute part?

A: The ASRM12JA390R is supplied in Cut Tape (CT) packaging, suitable for both manual and automated assembly processes.