PRNF14FTD1K21 Equivalent & Substitute Parts

Part Overview

The PRNF14FTD1K21 is a 1.21 kOhms ±1% metal film through-hole resistor rated at 0.25W (1/4W) in axial configuration, manufactured by Stackpole Electronics Inc. This component is part of the RNF series and maintains active product status. Substitute parts are identified based on matching electrical specifications (resistance value, tolerance, composition) and compatible mechanical form factors. Alternative sources and packaging options are available to support supply chain flexibility and application-specific requirements.

Substiute Parts

PRNF14FTD1K21

Stackpole Electronics IncIn Stock: 970PRNF14FTD1K21 Datasheet

Current PartRFQ

RNF14FAD1K21

Stackpole Electronics IncIn Stock: 868RNF14FAD1K21 Datasheet

DirectRFQ

RNF14FTD1K21

Stackpole Electronics IncIn Stock: 12330RNF14FTD1K21 Datasheet

DirectRFQ

CMF551K2100FHEB

Vishay DaleIn Stock: 9227CMF551K2100FHEB Datasheet

UpgradeRFQ

CMF551K2100FKEK

Vishay DaleIn Stock: 897CMF551K2100FKEK Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Direct Substitutes (Same Electrical & Mechanical Specifications):

• Resistance: 1.21 kOhms
• Tolerance: ±1%
• Power Rating: 0.25W (1/4W)
• Composition: Metal Film
• Package: Axial configuration
• Operating Temperature: -55°C ~ 155°C
• Temperature Coefficient: ±100ppm/°C

Direct substitutes differ only in packaging format (Tape & Reel, Cut Tape, or Tape & Box) and do not affect electrical performance or mechanical fit.

Upgrade Substitutes (Enhanced Specifications):

• Resistance: 1.21 kOhms (matched)
• Tolerance: ±1% (matched)
• Power Rating: 0.5W (1/2W) — higher rating
• Composition: Metal Film (matched)
• Package: Axial configuration (matched)
• Operating Temperature: -55°C ~ 175°C — extended upper limit
• Temperature Coefficient: ±50ppm/°C — improved stability (CMF551K2100FHEB only)

Upgrade substitutes provide enhanced thermal performance and higher power dissipation capability while maintaining electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Stackpole RNF Series): Select RNF14FTD1K21 (Cut Tape) or RNF14FAD1K21 (Tape & Box) when packaging format differs from the original Tape & Reel specification. All three Stackpole variants maintain identical electrical performance and operating parameters. RNF14FTD1K21 in Cut Tape format offers the highest current inventory (12,254 pcs).

For Upgraded Performance (Vishay Dale CMF Series): CMF551K2100FHEB is suitable when applications require extended operating temperature range (-55°C ~ 175°C) or improved temperature stability (±50ppm/°C). The 0.5W power rating provides additional thermal margin. This part maintains active product status and ROHS3 compliance.

Avoid CMF551K2100FKEK: This part is discontinued at DiGi Electronics and carries REACH Affected status, limiting its suitability for new designs despite technical compatibility.

Frequently Asked Questions (FAQ)

Q: Can RNF14FAD1K21 replace PRNF14FTD1K21 directly? A: Yes. Both parts are Stackpole RNF series resistors with identical electrical specifications (1.21 kOhms, ±1%, 0.25W, metal film). The difference is packaging format: RNF14FAD1K21 uses Tape & Box while PRNF14FTD1K21 uses Tape & Reel. Electrical performance and mechanical fit are equivalent.

Q: What is the advantage of CMF551K2100FHEB over the Stackpole RNF parts? A: CMF551K2100FHEB offers two enhancements: higher power rating (0.5W vs 0.25W) and extended operating temperature range (-55°C ~ 175°C vs -55°C ~ 155°C). Temperature coefficient is also improved (±50ppm/°C vs ±100ppm/°C). These upgrades are beneficial for high-temperature or high-dissipation applications.

Q: Are all substitute parts RoHS3 compliant? A: Yes. PRNF14FTD1K21, RNF14FAD1K21, RNF14FTD1K21, and CMF551K2100FHEB are all ROHS3 Compliant. CMF551K2100FKEK is also ROHS3 Compliant but carries REACH Affected status.

Q: Does packaging format affect electrical performance? A: No. Tape & Reel (TR), Cut Tape (CT), and Tape & Box (TB) packaging formats are handling and delivery methods only. Electrical specifications and component performance remain identical across all packaging options for the same part number variant.

Q: Why is CMF551K2100FKEK listed as discontinued? A: CMF551K2100FKEK is discontinued at DiGi Electronics and carries REACH Affected regulatory status. While technically compatible, CMF551K2100FHEB is the recommended Vishay Dale alternative for new applications.