RC12KB3K30 Equivalent & Substitute Parts

Part Overview

The RC12KB3K30 is a 3.3 kOhms ±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 part is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

RC12KB3K30

Stackpole Electronics IncIn Stock: 858RC12KB3K30 Datasheet

Current PartRFQ

ASRM1JB3K30

Stackpole Electronics IncIn Stock: 1086ASRM1JB3K30 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC12KB3K30 is determined by the following critical parameters:

• Resistance Value: Must match 3.3 kOhms exactly
• Package Type: Must be axial configuration for mechanical and electrical compatibility
• Power Rating: Substitute must meet or exceed 0.5W minimum requirement
• Tolerance: Substitute tolerance of ±5% or better is acceptable as it provides improved precision over the original ±10%
• Operating Temperature Range: Substitute must support the -55°C to 125°C minimum range
• Compliance: RoHS3 compliance required for regulatory alignment

The ASRM1JB3K30 qualifies as a direct substitute based on these parameters. While it employs metal film composition instead of carbon composition, it maintains the same resistance value, axial package, and exceeds the power rating requirement at 1W. The improved tolerance and extended temperature range provide enhanced performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The ASRM1JB3K30 is the recommended substitute for the obsolete RC12KB3K30. Selection is based on the following factors:

• Product Status: The substitute is active and in production, ensuring long-term availability and supply chain stability
• Regulatory Compliance: Both parts maintain ROHS3 compliance, satisfying environmental and regulatory requirements
• Performance Enhancement: The substitute provides improved tolerance (±5% versus ±10%) and doubled power rating (1W versus 0.5W), delivering superior performance margins in circuit applications
• Mechanical Compatibility: Identical axial package configuration ensures direct physical replacement without redesign
• Temperature Range: Extended operating temperature to 155°C provides additional thermal margin beyond the original specification

Frequently Asked Questions (FAQ)

Q: Can the ASRM1JB3K30 be used as a direct replacement for the RC12KB3K30?

A: Yes. Both components share the same 3.3 kOhms resistance value and axial package configuration. The substitute meets all minimum electrical and mechanical requirements for direct substitution.

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 employ a thin metal film. Metal film resistors typically offer better tolerance, lower noise, and improved temperature stability. The ASRM1JB3K30 metal film construction provides ±5% tolerance compared to the original ±10%.

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

A: No. A higher power rating (1W versus 0.5W) indicates the component can safely dissipate more power. Using a higher-rated component in an application designed for 0.5W operation does not negatively affect circuit performance.

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

A: Yes. The ASRM1JB3K30 has slightly larger dimensions (0.157" Dia x 0.433" L) compared to the RC12KB3K30 (0.142" Dia x 0.374" L). Both are axial packages suitable for through-hole mounting, but board layout should be verified for clearance.

Q: Is the extended temperature range of the substitute beneficial?

A: The ASRM1JB3K30 operates to 155°C versus the original 125°C maximum. This extended range provides additional thermal margin and may improve reliability in temperature-sensitive applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the RC12KB3K30 and ASRM1JB3K30 are ROHS3 compliant, meeting current environmental and regulatory standards.