RC1/2U105KB Equivalent & Substitute Parts

Part Overview

The RC1/2U105KB is a 1 MOhm ±10% 0.5W through-hole resistor with axial leads manufactured by Kamaya Inc. This carbon composition resistor is designed for general-purpose applications requiring moderate power dissipation in compact form factors. The part is classified as obsolete, making equivalent substitutes necessary for ongoing production, maintenance, and repair applications. Identifying compatible alternatives ensures design continuity and supply chain reliability.

Substiute Parts

RC1/2U105KB

Kamaya Inc.In Stock: 1168RC1/2U105KB Datasheet

Current PartRFQ

RC12KB1M00

Stackpole Electronics IncIn Stock: 752RC12KB1M00 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC1/2U105KB is determined by strict equivalence across the following critical parameters:

• Resistance Value: 1 MOhms (exact match required)
• Tolerance: ±10% (exact match required)
• Power Rating: 0.5W / 1/2W (exact match required)
• Composition: Carbon Composition (exact match required)
• Package Configuration: Axial through-hole (exact match required)
• Physical Dimensions: 0.142" Dia x 0.374" L / 3.60mm x 9.50mm (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Termination Count: 2 leads (exact match required)

The substitute part RC12KB1M00 meets all these criteria and is therefore classified as a parametric equivalent. Both parts share identical electrical specifications and mechanical form factors, enabling direct substitution in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The RC12KB1M00 manufactured by Stackpole Electronics Inc. is a direct parametric equivalent to the RC1/2U105KB. Both parts are obsolete, indicating limited future availability through standard distribution channels. The Stackpole part carries ROHS3 compliance, which represents an enhanced regulatory status compared to the standard RoHS compliance of the Kamaya part. Both parts meet the same electrical and mechanical specifications required for circuit-level substitution.

Selection between these parts should be based on current inventory availability and supply chain logistics. The RC12KB1M00 offers the additional feature designation of non-inductive and pulse-withstanding characteristics, which may provide enhanced performance in applications sensitive to high-frequency noise or transient events, though these features do not alter the fundamental substitution equivalence.

Frequently Asked Questions (FAQ)

Q: Can RC12KB1M00 be used as a direct replacement for RC1/2U105KB?

A: Yes. The RC12KB1M00 is a parametric equivalent with identical resistance value (1 MOhms), tolerance (±10%), power rating (0.5W), composition (carbon composition), package type (axial), physical dimensions (0.142" Dia x 0.374" L), and operating temperature range (-55°C ~ 125°C).

Q: Are there any physical differences between these parts?

A: No. Both parts share identical physical dimensions of 0.142" Dia x 0.374" L (3.60mm x 9.50mm) and axial package configuration, ensuring mechanical compatibility in PCB layouts and through-hole applications.

Q: What is the significance of the "non-inductive" and "pulse withstanding" features listed for RC12KB1M00?

A: These features indicate enhanced performance characteristics in the Stackpole part. Non-inductive construction reduces parasitic inductance, and pulse withstanding capability indicates tolerance for transient voltage spikes. These features do not affect basic substitution equivalence but may provide operational advantages in sensitive applications.

Q: Do both parts meet current regulatory compliance standards?

A: Both parts are RoHS compliant. The RC12KB1M00 carries ROHS3 compliance, representing a more current regulatory designation. Both parts are classified as RoHS Compliant and REACH Unaffected, meeting environmental and hazardous substance restrictions.

Q: Why are both parts listed as obsolete?

A: Both the RC1/2U105KB and RC12KB1M00 are carbon composition resistors from discontinued product lines. Modern applications typically use thin-film or metal-film resistors. Obsolete status indicates limited manufacturing and distribution availability, making inventory planning and early procurement necessary for ongoing applications.

Q: Can these parts be used interchangeably in new designs?

A: While electrically and mechanically equivalent, both parts are obsolete. New designs should evaluate modern resistor technologies. For legacy system maintenance or reproduction applications, these parts remain functionally interchangeable based on their identical specifications.