RNMF14FTC1K21 Equivalent & Substitute Parts

Part Overview

The RNMF14FTC1K21 is a 1.21 kOhms ±1% metal film through-hole resistor rated at 0.25W (1/4W) with axial leads. Manufactured by Stackpole Electronics Inc as part of the RNMF (Mini) series, this component features flame retardant coating and safety-rated construction. The part maintains Active product status with 731 units in current inventory. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Substiute Parts

RNMF14FTC1K21

Stackpole Electronics IncIn Stock: 791RNMF14FTC1K21 Datasheet

Current PartRFQ

CMF501K2100FHEB

Vishay DaleIn Stock: 3420CMF501K2100FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNMF14FTC1K21 is determined by the following critical parameters:

• Electrical Equivalence: Resistance value (1.21 kOhms), tolerance (±1%), and power rating (0.25W) must be identical
• Composition: Metal film construction required
• Package Configuration: Axial through-hole package mandatory
• Temperature Performance: Temperature coefficient (±50ppm/°C) and operating range compatibility
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status required
• Physical Compatibility: Axial lead configuration with compatible dimensions for PCB mounting

The CMF501K2100FHEB from Vishay Dale meets all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

Both the RNMF14FTC1K21 and CMF501K2100FHEB maintain Active product status and satisfy ROHS3 compliance requirements. The CMF501K2100FHEB provides an extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C) and includes moisture-resistant features in addition to flame retardant coating. Both components carry identical electrical specifications and axial package configuration. Selection between these parts depends on application temperature requirements and packaging format availability (Tape & Reel versus Cut Tape).

Frequently Asked Questions (FAQ)

Q: Can CMF501K2100FHEB replace RNMF14FTC1K21 in all applications? A: Yes, provided the application operating temperature does not exceed 155°C. The CMF501K2100FHEB supports temperatures up to 175°C, making it suitable for higher-temperature environments where the RNMF14FTC1K21 may not be specified.

Q: Are the physical dimensions compatible for PCB mounting? A: Both components use axial lead configuration. The RNMF14FTC1K21 measures 0.070" diameter × 0.130" length, while the CMF501K2100FHEB measures 0.065" diameter × 0.150" length. These dimensional differences are within typical PCB design tolerances for axial component mounting.

Q: What is the difference between Tape & Reel and Cut Tape packaging? A: Tape & Reel (TR) packaging supplies components on continuous tape suitable for automated assembly equipment. Cut Tape (CT) packaging provides components pre-cut from tape for manual or semi-automated handling. Both formats contain identical components; packaging selection depends on assembly process requirements.

Q: Do both parts meet the same regulatory standards? A: Yes. Both the RNMF14FTC1K21 and CMF501K2100FHEB are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements for industrial and commercial applications.

Q: What is the significance of the ±50ppm/°C temperature coefficient? A: The temperature coefficient indicates resistance value drift with temperature changes. At ±50ppm/°C, both components exhibit identical temperature stability, ensuring consistent circuit performance across the specified operating range.