RNF14FAD1K21 Equivalent & Substitute Parts

Part Overview

The RNF14FAD1K21 is a 1.21 kOhms ±1% metal film through-hole resistor rated at 0.25W (1/4W) in axial package configuration, manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety-grade construction suitable for industrial and consumer applications requiring precision resistance values with tight tolerance specifications. The part is currently active in production with 844 units in stock. Substitute parts are identified based on matching electrical specifications (resistance value, tolerance, composition) and compatible mechanical form factors, with consideration for enhanced performance characteristics and packaging availability.

Substiute Parts

RNF14FAD1K21

Stackpole Electronics IncIn Stock: 868RNF14FAD1K21 Datasheet

Current PartRFQ

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

Substitute parts for the RNF14FAD1K21 are qualified based on the following criteria:

Primary Substitution Criteria (Mandatory Match):

• Resistance value: 1.21 kOhms
• Tolerance: ±1%
• Composition: Metal Film
• Package: Axial through-hole
• Number of terminations: 2

Secondary Compatibility Factors:

• Power rating equal to or greater than 0.25W
• Operating temperature range encompassing or exceeding -55°C ~ 155°C
• RoHS3 compliance
• Flame retardant and safety features

Substitutes are grouped into two categories: direct equivalents (identical specifications and packaging format) and upgraded alternatives (enhanced power rating or improved temperature coefficient with compatible mechanical form factor).

Parameter Comparison

Engineering Selection Recommendations

RNF14FTD1K21 (Direct Equivalent): This Stackpole Electronics part provides identical electrical and mechanical specifications to the RNF14FAD1K21, with the primary difference being packaging format (Cut Tape versus Tape & Box). Both parts are active products with ROHS3 compliance. Selection of RNF14FTD1K21 is appropriate when Cut Tape packaging is preferred for automated assembly processes, with significantly higher inventory availability (12254 units).

CMF551K2100FHEB (Upgraded Alternative): This Vishay Dale resistor offers enhanced specifications including doubled power rating (0.5W versus 0.25W), improved temperature coefficient (±50ppm/°C versus ±100ppm/°C), and extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C). The part maintains identical resistance, tolerance, and axial package compatibility. CMF551K2100FHEB is suitable for applications requiring higher power dissipation capability or improved temperature stability. Product status is active with 9125 units in stock.

CMF551K2100FKEK (Upgraded Alternative - Limited Availability): This Vishay Dale part provides the same power rating and temperature range enhancements as CMF551K2100FHEB but with bulk packaging and discontinued status at DiGi Electronics. Inventory is limited to 816 units. This option is suitable only when bulk packaging is required and supply chain continuity is not a concern.

Frequently Asked Questions (FAQ)

Q: Can RNF14FTD1K21 be used as a direct replacement for RNF14FAD1K21?

A: Yes. Both parts are manufactured by Stackpole Electronics with identical electrical specifications (1.21 kOhms ±1%, 0.25W, metal film, axial package). The only difference is packaging format: RNF14FAD1K21 is supplied in Tape & Box format while RNF14FTD1K21 is supplied in Cut Tape format. Electrical performance and mechanical compatibility are equivalent.

Q: What are the advantages of using CMF551K2100FHEB over the original RNF14FAD1K21?

A: CMF551K2100FHEB provides three performance enhancements: (1) doubled power rating (0.5W versus 0.25W) allowing higher current handling, (2) improved temperature coefficient (±50ppm/°C versus ±100ppm/°C) for better stability across temperature variations, and (3) extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C). All other specifications including resistance value, tolerance, and axial package remain compatible.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. RNF14FAD1K21, RNF14FTD1K21, CMF551K2100FHEB, and CMF551K2100FKEK are all ROHS3 compliant. CMF551K2100FKEK carries REACH Affected status while the other three parts are REACH Unaffected.

Q: What is the difference between Tape & Box and Cut Tape packaging?

A: Tape & Box packaging (RNF14FAD1K21) includes a protective box and is suitable for manual handling and smaller volume applications. Cut Tape packaging (RNF14FTD1K21, CMF551K2100FHEB) is optimized for automated pick-and-place assembly equipment and high-volume production. Bulk packaging (CMF551K2100FKEK) is supplied without tape or box format.

Q: Can CMF551K2100FKEK be used if the other Vishay parts are unavailable?

A: CMF551K2100FKEK is electrically compatible and provides the same performance enhancements as CMF551K2100FHEB. However, this part is discontinued at DiGi Electronics with limited inventory (816 units). Use only when bulk packaging is specifically required and supply continuity is not a concern.

Q: What determines whether a part can substitute for RNF14FAD1K21?

A: Substitution is determined by matching four core parameters: (1) resistance value of 1.21 kOhms, (2) tolerance of ±1%, (3) metal film composition, and (4) axial through-hole package with 2 terminations. Power rating must be equal to or greater than 0.25W, and operating temperature range must encompass the required application range. All substitutes must maintain ROHS3 compliance.