RNF18FTC680K Equivalent & Substitute Parts

Part Overview

The RNF18FTC680K is a 680 kOhms ±1% metal film through-hole resistor rated at 0.125W (1/8W) in axial package configuration, manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety-rated construction suitable for industrial and consumer applications. The part maintains active product status with ROHS3 compliance and REACH unaffected certification. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements permit higher power ratings within the same electrical specifications.

Substiute Parts

RNF18FTC680K

Stackpole Electronics IncIn Stock: 829RNF18FTC680K Datasheet

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RNMF14FTC680K

Stackpole Electronics IncIn Stock: 18309RNMF14FTC680K Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The RNMF14FTC680K qualifies as a direct substitute based on the following matching parameters:

• Resistance value: 680 kOhms (identical)
• Tolerance: ±1% (identical)
• Composition: Metal Film (identical)
• Temperature Coefficient: ±50ppm/°C (identical)
• Operating Temperature Range: -55°C ~ 155°C (identical)
• Package Type: Axial (identical)
• Features: Flame Retardant Coating, Safety (identical)
• RoHS Status: ROHS3 Compliant (identical)

The primary difference is the power rating: RNMF14FTC680K is rated at 0.25W (1/4W) compared to the RNF18FTC680K at 0.125W (1/8W). This represents an upgrade in power dissipation capability while maintaining all other electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Both RNF18FTC680K and RNMF14FTC680K maintain active product status with identical compliance certifications (ROHS3 Compliant, REACH Unaffected). The RNMF14FTC680K provides higher power dissipation capacity at 0.25W versus 0.125W, making it suitable for applications where thermal margin is required. Physical dimensions are nearly identical with negligible diameter variation (0.071" vs 0.070"). Component selection should be based on circuit power dissipation requirements and packaging format availability (Tape & Reel versus Cut Tape).

Frequently Asked Questions (FAQ)

Q: Can RNMF14FTC680K replace RNF18FTC680K in all applications?

A: The RNMF14FTC680K is electrically and mechanically compatible as a direct substitute. The higher power rating (0.25W vs 0.125W) provides additional thermal capacity. Physical dimensions are nearly identical, ensuring PCB footprint compatibility. Verify that the higher power rating does not introduce unintended thermal effects in the specific circuit design.

Q: What is the significance of the power rating difference?

A: Power rating indicates maximum continuous power dissipation. The 0.25W rating of RNMF14FTC680K provides greater thermal margin compared to the 0.125W rating of RNF18FTC680K. In circuits where calculated power dissipation approaches or exceeds 0.125W, the substitute part offers improved reliability and operating margin.

Q: Are there packaging format differences?

A: RNF18FTC680K is supplied in Tape & Reel (TR) format, while RNMF14FTC680K is supplied in Cut Tape (CT) format. Both are axial through-hole components with compatible PCB mounting. Packaging format selection depends on assembly process requirements and volume considerations.

Q: Do both parts meet the same compliance standards?

A: Both parts are ROHS3 Compliant and REACH Unaffected. Temperature coefficient, operating temperature range, and safety features are identical across both components.