RNF14FAD309K Equivalent & Substitute Parts

Part Overview

The RNF14FAD309K is a 309 kOhms ±1% 0.25W (1/4W) through-hole resistor manufactured by Stackpole Electronics Inc. This axial metal film resistor features flame retardant coating and safety characteristics, designed for applications requiring precision resistance values in compact form factors. The part is currently active in production with ROHS3 compliance. Substitute parts are identified to address packaging availability, inventory levels, and performance upgrade requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

RNF14FAD309K

Stackpole Electronics IncIn Stock: 710RNF14FAD309K Datasheet

Current PartRFQ

RNF14FTD309K

Stackpole Electronics IncIn Stock: 13851RNF14FTD309K Datasheet

DirectRFQ

CMF55309K00FHEB

Vishay DaleIn Stock: 1926CMF55309K00FHEB Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RNF14FAD309K are classified based on the following substitution criteria:

Direct Substitute (Packaging Variant): RNF14FTD309K maintains identical electrical specifications (309 kOhms, ±1%, 0.25W, metal film composition, ±100ppm/°C temperature coefficient, -55°C ~ 155°C operating range) and mechanical form factor (axial package). The only difference is packaging format (Cut Tape versus Tape & Box), making this a direct functional equivalent suitable for applications where packaging configuration does not impose constraints.

Upgrade Substitute (Enhanced Performance): CMF55309K00FHEB provides higher power dissipation capability (0.5W versus 0.25W) while maintaining the same resistance value (309 kOhms) and tolerance (±1%). This part offers improved temperature coefficient (±50ppm/°C versus ±100ppm/°C), extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C), and moisture-resistant features. The axial package and metal film composition remain consistent. This substitution is applicable when thermal margin or environmental performance improvements are required.

Parameter Comparison

Engineering Selection Recommendations

RNF14FTD309K Selection: Choose this direct substitute when packaging format (Cut Tape) aligns with assembly and procurement workflows. Electrical and thermal performance are identical to the primary part. Both Stackpole Electronics Inc parts maintain equivalent ROHS3 compliance and active production status.

CMF55309K00FHEB Selection: Select this upgrade substitute when circuit design requires enhanced thermal performance, improved temperature stability (±50ppm/°C versus ±100ppm/°C), or extended operating temperature range to 175°C. The higher power rating (0.5W) provides additional thermal margin in applications with elevated ambient temperatures or power dissipation concerns. Moisture-resistant features offer enhanced environmental protection. All parts maintain ROHS3 compliance and active production status.

Frequently Asked Questions (FAQ)

Q: Can RNF14FTD309K be used as a direct replacement for RNF14FAD309K?

A: Yes. RNF14FTD309K is a direct electrical and mechanical equivalent. The only difference is packaging format (Cut Tape versus Tape & Box). Both parts have identical resistance (309 kOhms), tolerance (±1%), power rating (0.25W), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C ~ 155°C).

Q: When should CMF55309K00FHEB be used instead of the primary part?

A: CMF55309K00FHEB is an upgrade substitute suitable for applications requiring higher power dissipation capability (0.5W versus 0.25W), improved temperature stability (±50ppm/°C versus ±100ppm/°C), extended operating temperature range (-55°C ~ 175°C), or moisture-resistant performance. Resistance value and tolerance remain identical.

Q: Are there physical size differences between these parts?

A: Minor dimensional variations exist. RNF14FAD309K and RNF14FTD309K are 0.093" diameter x 0.250" length. CMF55309K00FHEB is 0.090" diameter x 0.240" length. These differences are within typical PCB layout tolerances for axial component mounting.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All three parts are ROHS3 compliant and maintain active production status. CMF55309K00FHEB carries REACH Affected status, while RNF14FAD309K and RNF14FTD309K are REACH Unaffected.

Q: What is the primary reason to select one substitute over another?

A: Selection depends on packaging requirements (Cut Tape availability), thermal performance needs (power rating and temperature coefficient), and environmental operating conditions (temperature range and moisture resistance). Electrical specifications (resistance, tolerance) are identical across all options.