RNF14FTC1K21 Equivalent & Substitute Parts

Part Overview

The RNF14FTC1K21 is a 1.21 kOhms ±1% 0.25W (1/4W) through-hole axial resistor manufactured by Stackpole Electronics Inc. This metal film resistor features flame retardant coating and safety construction, designed for applications requiring precision resistance values with tight tolerance specifications. The part is currently active in production with 688 units in stock. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within specified parameters.

Substiute Parts

RNF14FTC1K21

Stackpole Electronics IncIn Stock: 788RNF14FTC1K21 Datasheet

Current PartRFQ

CMF551K2100FHEB

Vishay DaleIn Stock: 9227CMF551K2100FHEB Datasheet

UpgradeRFQ

CMF501K2100FHEB

Vishay DaleIn Stock: 3420CMF501K2100FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FTC1K21 are qualified based on the following critical parameters:

• Resistance value: 1.21 kOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Composition: Metal Film (exact match required)
• Package: Axial through-hole (exact match required)
• Temperature Coefficient: ±50ppm/°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

Power rating and physical dimensions may vary within acceptable substitution limits. Operating temperature range may extend beyond the original specification. All substitute parts maintain the same electrical performance characteristics and safety features (flame retardant coating, moisture resistance where applicable).

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain full electrical equivalence to the RNF14FTC1K21 across all critical parameters: resistance value, tolerance, temperature coefficient, and composition. All three parts are ROHS3 compliant and carry active product status.

CMF501K2100FHEB (MFR Recommended) provides direct electrical and mechanical substitution with identical power rating (0.25W) and extended operating temperature range (-55°C ~ 175°C). This part is manufactured by Vishay Dale with 3355 units in stock.

CMF551K2100FHEB (Upgrade) offers increased power dissipation capability (0.5W vs 0.25W) while maintaining all other electrical specifications. This higher power rating provides additional thermal margin in applications. Vishay Dale manufactures this part with 9125 units in stock, offering superior availability.

Both Vishay Dale parts include moisture-resistant features in addition to flame retardant coating, providing enhanced environmental protection compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can CMF501K2100FHEB directly replace RNF14FTC1K21?

A: Yes. CMF501K2100FHEB maintains identical resistance (1.21 kOhms), tolerance (±1%), power rating (0.25W), temperature coefficient (±50ppm/°C), and composition (metal film). Physical dimensions are smaller, but axial package compatibility is maintained. Operating temperature range extends to 175°C.

Q: What is the difference between CMF501K2100FHEB and CMF551K2100FHEB?

A: The primary difference is power rating: CMF501K2100FHEB is rated 0.25W (1/4W), while CMF551K2100FHEB is rated 0.5W (1/2W). All other electrical parameters are identical. Physical dimensions differ slightly due to the higher power rating. Both parts are manufactured by Vishay Dale with ROHS3 compliance.

Q: Are there any compatibility concerns with the smaller physical dimensions of CMF501K2100FHEB?

A: The CMF501K2100FHEB has smaller diameter (0.065" vs 0.093") and length (0.150" vs 0.250") compared to RNF14FTC1K21. Both are axial through-hole packages with 2 terminations. PCB layout and mechanical clearance must be verified for the specific application, as the smaller form factor may affect board routing and component spacing.

Q: Should I select the upgrade part CMF551K2100FHEB for higher reliability?

A: CMF551K2100FHEB provides increased power dissipation margin (0.5W vs 0.25W) and extended operating temperature range (-55°C ~ 175°C). Selection depends on application thermal requirements and available board space. The higher power rating does not improve electrical precision or stability; it only increases thermal headroom.

Q: Are all three parts RoHS compliant?

A: Yes. RNF14FTC1K21, CMF501K2100FHEB, and CMF551K2100FHEB are all ROHS3 compliant. All parts are REACH unaffected and classified as EAR99 for export purposes.

Q: What packaging formats are available?

A: RNF14FTC1K21 is supplied in Tape & Reel (TR) format. Both Vishay Dale substitute parts (CMF501K2100FHEB and CMF551K2100FHEB) are supplied in Cut Tape (CT) format. Packaging selection may affect procurement and assembly processes.