RC1KB43R0 Equivalent & Substitute Parts

Part Overview

The RC1KB43R0 is a 43 Ohms ±10% 1W through-hole resistor manufactured by Stackpole Electronics Inc. This axial carbon composition resistor features non-inductive and pulse-withstanding characteristics, designed for applications requiring robust performance across the -55°C to 125°C operating temperature range. The product is currently obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

RC1KB43R0

Stackpole Electronics IncIn Stock: 931RC1KB43R0 Datasheet

Current PartRFQ

ASRM1JA43R0

Stackpole Electronics IncIn Stock: 900ASRM1JA43R0 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC1KB43R0 is determined by the following critical parameters:

• Resistance Value: Must be 43 Ohms (exact match required)
• Power Rating: Must be 1W minimum
• Package Configuration: Must be axial through-hole format
• Electrical Characteristics: Must support pulse withstanding capability
• Compliance: Must maintain ROHS3 compliance and REACH unaffected status
• Operating Temperature: Must support minimum -55°C to 125°C range

The ASRM1JA43R0 qualifies as a direct substitute based on these parameters. While it employs metal film composition instead of carbon composition, it maintains the required 43 Ohm resistance, 1W power rating, axial package format, pulse-withstanding capability, and regulatory compliance. The improved tolerance (±5% versus ±10%) and extended temperature range (-55°C to 155°C) provide enhanced performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The ASRM1JA43R0 is the qualified substitute for the obsolete RC1KB43R0. Selection is supported by the following factors:

• Product Status: The substitute is active and currently manufactured, ensuring long-term availability and supply chain continuity.
• Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and safety requirements.
• Electrical Equivalence: Identical resistance value (43 Ohms) and power rating (1W) with improved tolerance specification (±5% versus ±10%).
• Package Compatibility: Both components use axial through-hole configuration, enabling direct mechanical and electrical substitution.
• Performance Enhancement: The substitute provides extended operating temperature range (-55°C to 155°C) and additional safety features including flame retardant coating.

Frequently Asked Questions (FAQ)

Q: Can the ASRM1JA43R0 be used as a direct replacement for the RC1KB43R0?

A: Yes. Both components share identical resistance value (43 Ohms), power rating (1W), and axial package format. The substitute meets all electrical and mechanical requirements for direct substitution.

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

A: Carbon composition resistors (RC1KB43R0) use a carbon-based resistive element, while metal film resistors (ASRM1JA43R0) use a thin metal film. The metal film variant provides tighter tolerance (±5% versus ±10%), lower temperature coefficient, and improved stability.

Q: Does the substitute maintain pulse-withstanding capability?

A: Yes. The ASRM1JA43R0 includes pulse-withstanding characteristics equivalent to the original component, supporting transient overvoltage conditions.

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

A: Yes. The RC1KB43R0 measures 0.224" Dia x 0.563" L (5.70mm x 14.30mm), while the ASRM1JA43R0 measures 0.157" Dia x 0.433" L (4.00mm x 11.00mm). The substitute is physically smaller but maintains axial through-hole compatibility.

Q: What is the temperature coefficient difference?

A: The RC1KB43R0 does not specify a temperature coefficient value. The ASRM1JA43R0 specifies 0/-1800ppm/°C, indicating superior temperature stability across the operating range.

Q: Do both components meet current regulatory requirements?

A: Yes. Both the RC1KB43R0 and ASRM1JA43R0 are ROHS3 compliant and REACH unaffected, satisfying current environmental and safety regulations.