RC12KB68K0 Equivalent & Substitute Parts

Part Overview

The RC12KB68K0 is a 68 kOhms ±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 classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

RC12KB68K0

Stackpole Electronics IncIn Stock: 922RC12KB68K0 Datasheet

Current PartRFQ

ASRM1JA68K0

Stackpole Electronics IncIn Stock: 1140ASRM1JA68K0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC12KB68K0 is based on the following critical parameters:

• Resistance Value: 68 kOhms (exact match required)
• Package Configuration: Axial through-hole (mechanical compatibility)
• Power Rating: Minimum 0.5W (equal or higher acceptable)
• Tolerance: ±10% or better (tighter tolerance acceptable)
• Composition Type: Carbon composition or metal film (functional equivalence)
• Operating Temperature Range: Minimum -55°C ~ 125°C coverage
• Regulatory Compliance: ROHS3 compliant

The ASRM1JA68K0 qualifies as a substitute based on matching resistance value, axial package configuration, superior power rating (1W vs. 0.5W), tighter tolerance (±5% vs. ±10%), and equivalent operating temperature coverage with extended upper limit (155°C vs. 125°C).

Parameter Comparison

Engineering Selection Recommendations

The ASRM1JA68K0 is suitable for direct substitution of the RC12KB68K0 based on the following factors:

• Resistance Match: Both components provide 68 kOhms with identical nominal value
• Package Compatibility: Axial configuration ensures mechanical fit in existing PCB layouts
• Power Capability: The 1W rating of ASRM1JA68K0 exceeds the 0.5W requirement, providing operational margin
• Tolerance Improvement: ±5% tolerance is superior to the original ±10%, enhancing circuit accuracy
• Temperature Coverage: Extended operating range (-55°C ~ 155°C) encompasses the original specification
• Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status
• Product Availability: ASRM1JA68K0 is active production status with 1074 units in stock, ensuring procurement continuity

Frequently Asked Questions (FAQ)

Q: Can ASRM1JA68K0 be used as a direct replacement for RC12KB68K0?

A: Yes. Both components share identical 68 kOhms resistance value and axial package configuration. The substitute offers higher power rating (1W vs. 0.5W), tighter tolerance (±5% vs. ±10%), and extended operating temperature range, making it functionally compatible for the same circuit applications.

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

A: Carbon composition resistors (RC12KB68K0) and metal film resistors (ASRM1JA68K0) differ in construction and performance characteristics. Metal film resistors typically provide better tolerance accuracy, lower noise, and improved temperature stability. Both types are suitable for general-purpose applications and maintain equivalent pulse withstanding capability.

Q: Does the higher power rating of ASRM1JA68K0 affect circuit performance?

A: No. Power rating indicates the maximum power the resistor can safely dissipate. A higher rating (1W vs. 0.5W) does not alter the resistor's electrical behavior in the circuit. The component will operate identically at the same voltage and current levels.

Q: Are there physical size differences between these components?

A: Yes. RC12KB68K0 measures 0.142" diameter × 0.374" length (3.60mm × 9.50mm), while ASRM1JA68K0 measures 0.157" diameter × 0.433" length (4.00mm × 11.00mm). Both are axial through-hole components with standard lead spacing suitable for conventional PCB layouts.

Q: What is the significance of the ±5% tolerance improvement?

A: Tighter tolerance (±5% vs. ±10%) means the actual resistance value will be closer to the nominal 68 kOhms specification. This improves circuit accuracy and reduces performance variation across production batches, beneficial for precision applications.

Q: Are both components RoHS compliant?

A: Yes. Both RC12KB68K0 and ASRM1JA68K0 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.