RC1KB1K20 Equivalent & Substitute Parts

Part Overview

The RC1KB1K20 is a 1.2 kOhms ±10% 1W 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 identification of suitable substitute components essential for ongoing maintenance, repair, and legacy system support. Equivalent parts must maintain the same resistance value, power rating, and axial package configuration while meeting applicable compliance standards.

Substiute Parts

RC1KB1K20

Stackpole Electronics IncIn Stock: 898RC1KB1K20 Datasheet

Current PartRFQ

ASRM1JA1K20

Stackpole Electronics IncIn Stock: 889ASRM1JA1K20 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC1KB1K20 is determined by the following critical parameters:

• Resistance Value: Must be 1.2 kOhms
• Power Rating: Must be 1W minimum
• Package Configuration: Must be axial through-hole
• Tolerance: May be equal or tighter (±10% or better)
• Operating Temperature Range: Must encompass or exceed -55°C to 125°C
• Compliance: Must maintain ROHS3 compliance and REACH unaffected status

The ASRM1JA1K20 qualifies as a direct substitute based on matching resistance, power rating, and axial package, while offering improved tolerance (±5% versus ±10%) and extended operating temperature range (-55°C to 155°C).

Parameter Comparison

Engineering Selection Recommendations

The ASRM1JA1K20 is the designated substitute for the obsolete RC1KB1K20. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The substitute offers operational advantages including tighter tolerance specification (±5% versus ±10%), extended maximum operating temperature (155°C versus 125°C), and active production status with confirmed inventory availability. The axial package configuration and 1W power rating remain identical, ensuring direct mechanical and electrical compatibility in circuit applications. The shift from carbon composition to metal film technology in the substitute provides improved stability characteristics while maintaining the required pulse-withstanding capability.

Frequently Asked Questions (FAQ)

Q: Can the ASRM1JA1K20 be used as a direct replacement for the RC1KB1K20?

A: Yes. Both components share identical resistance value (1.2 kOhms), power rating (1W), and axial package configuration. The substitute meets or exceeds all critical electrical and mechanical parameters required for direct substitution.

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

A: Carbon composition resistors use a carbon film deposited on a ceramic core, while metal film resistors use a thin metal alloy film. Metal film technology provides tighter tolerance, lower noise, and better temperature stability. Both technologies are suitable for pulse-withstanding applications.

Q: Does the tighter tolerance of the ASRM1JA1K20 (±5%) affect circuit compatibility?

A: No. Tighter tolerance is a performance enhancement. Any circuit designed to accept ±10% tolerance will function correctly with a ±5% tolerance component.

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

A: Yes. The RC1KB1K20 measures 0.224" diameter × 0.563" length (5.70mm × 14.30mm), while the ASRM1JA1K20 measures 0.157" diameter × 0.433" length (4.00mm × 11.00mm). Both are axial packages suitable for through-hole mounting, though the substitute is more compact.

Q: What is the temperature coefficient difference, and does it matter?

A: The RC1KB1K20 does not specify a temperature coefficient. The ASRM1JA1K20 specifies 0/-1800ppm/°C, indicating metal film stability characteristics. This provides predictable resistance variation across the extended operating temperature range.

Q: Is the ASRM1JA1K20 currently available?

A: Yes. The substitute is in active production status with 856 pieces confirmed in new original stock, ensuring reliable supply for replacement and new applications.