RC14KB4K70 Equivalent & Substitute Parts

Part Overview

The RC14KB4K70 is a 4.7 kOhms ±10% 0.25W (1/4W) through-hole resistor with axial leads manufactured by Stackpole Electronics Inc. This carbon composition resistor features non-inductive and pulse withstanding characteristics, operating across a 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

RC14KB4K70

Stackpole Electronics IncIn Stock: 1219RC14KB4K70 Datasheet

Current PartRFQ

ASRM12JB4K70

Stackpole Electronics IncIn Stock: 1194ASRM12JB4K70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The ASRM12JB4K70 qualifies as a substitute for the RC14KB4K70 based on the following critical parameters:

Matching Parameters:

• Resistance value: 4.7 kOhms (identical)
• Package configuration: Axial through-hole leads (identical)
• Manufacturer: Stackpole Electronics Inc (same source)
• Operating temperature range: -55°C to 155°C (encompasses original range)
• Pulse withstanding capability: Present in both designs
• RoHS compliance: Both ROHS3 compliant

Allowable Variations:

• Tolerance: Upgraded from ±10% to ±5% (tighter tolerance acceptable)
• Power rating: Increased from 0.25W to 0.5W (higher rating acceptable)
• Composition: Changed from carbon composition to metal film (functionally equivalent for this resistance value)
• Temperature coefficient: Specified in substitute (-1800ppm/°C) versus unspecified in original

Parameter Comparison

Engineering Selection Recommendations

The ASRM12JB4K70 is the manufacturer-recommended substitute for the obsolete RC14KB4K70. Selection of this substitute is supported by:

• Active product status ensuring long-term availability and supply chain stability
• Identical resistance value and axial package configuration enabling direct mechanical and electrical compatibility
• Tighter tolerance specification (±5%) providing improved circuit performance compared to the original ±10% tolerance
• Higher power rating (0.5W versus 0.25W) offering enhanced thermal margin in the application
• Extended operating temperature range (-55°C to 155°C) providing broader environmental compatibility
• Maintained pulse withstanding capability and RoHS3 compliance
• Same manufacturer source ensuring consistent quality and reliability standards

Frequently Asked Questions (FAQ)

Q: Can the ASRM12JB4K70 be used as a direct replacement for the RC14KB4K70?

A: Yes. Both components share identical resistance values (4.7 kOhms) and axial package configurations. The substitute features improved specifications including tighter tolerance, higher power rating, and extended temperature range, making it functionally compatible for direct substitution.

Q: What are the physical dimension differences between these parts?

A: The RC14KB4K70 measures 0.094" diameter × 0.248" length (2.40mm × 6.30mm). The ASRM12JB4K70 measures 0.118" diameter × 0.354" length (3.00mm × 9.00mm). The substitute is slightly larger due to its higher power rating. Verify PCB layout and component spacing accommodate the larger dimensions.

Q: Why does the substitute have a different composition (metal film versus carbon composition)?

A: Metal film resistors provide superior performance characteristics including tighter tolerance, lower temperature coefficient, and better frequency response. For the 4.7 kOhms resistance value, metal film composition is functionally equivalent and offers enhanced reliability compared to carbon composition.

Q: Are both parts RoHS compliant?

A: Yes. Both the RC14KB4K70 and ASRM12JB4K70 are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.

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

A: The substitute specifies a temperature coefficient of 0/-1800ppm/°C, while the original specification does not provide this value. The specified coefficient indicates predictable resistance variation across temperature extremes, which is beneficial for precision circuit applications.

Q: Can I use the ASRM12JB4K70 in high-frequency applications?

A: Metal film resistors like the ASRM12JB4K70 generally perform better at higher frequencies compared to carbon composition resistors. The non-inductive feature of the original is not explicitly stated for the substitute, but metal film construction typically exhibits lower inductance characteristics suitable for RF and high-frequency applications.