RNF18FTD442R Equivalent & Substitute Parts

Part Overview

The RNF18FTD442R is a 442 Ohm metal film through-hole resistor manufactured by Stackpole Electronics Inc. This axial component is rated at 1/8W (0.125W) with ±1% tolerance and features flame retardant coating for safety applications. The part is currently active in production with ROHS3 compliance and is suitable for applications requiring precision resistive elements in compact form factors.

Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the allowed parameter range for this resistor category.

Substiute Parts

RNF18FTD442R

Stackpole Electronics IncIn Stock: 1118RNF18FTD442R Datasheet

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RNMF14FTD442R

Stackpole Electronics IncIn Stock: 1164RNMF14FTD442R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The RNMF14FTD442R qualifies as a substitute for the RNF18FTD442R based on the following criteria:

Matching Parameters:

• Resistance value: 442 Ohms (identical)
• Tolerance: ±1% (identical)
• Composition: Metal Film (identical)
• Temperature Coefficient: ±100ppm/°C (identical)
• Operating Temperature Range: -55°C to 155°C (identical)
• Package Type: Axial (identical)
• Features: Flame Retardant Coating, Safety (identical)
• RoHS Status: ROHS3 Compliant (identical)

Allowable Variation:

• Power Rating: The substitute part is rated at 0.25W (1/4W), which exceeds the original 0.125W (1/8W) specification. Higher power ratings are acceptable substitutes in applications where the original power rating is sufficient, as the substitute provides additional thermal margin.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF18FTD442R and RNMF14FTD442R are active products from Stackpole Electronics Inc with identical ROHS3 compliance and REACH unaffected status. The primary distinction is the power rating differential.

The RNMF14FTD442R (1/4W) is suitable as a direct substitute where the application power dissipation does not exceed 0.125W. The higher power rating provides additional thermal headroom without altering electrical performance. Both components maintain identical resistance, tolerance, temperature coefficient, and operating temperature specifications.

Physical dimensions are nearly identical, with the substitute measuring 0.070" diameter versus 0.071" for the original, making board layout compatibility straightforward for axial through-hole mounting.

Frequently Asked Questions (FAQ)

Q: Can the RNMF14FTD442R replace the RNF18FTD442R in all applications?

A: Yes, provided the application power dissipation does not exceed 0.125W. The substitute's higher 0.25W rating is compatible with circuits designed for the original 0.125W component.

Q: Are there dimensional compatibility concerns?

A: No. Both components are axial through-hole resistors with identical length (0.130") and nearly identical diameter (0.070" vs 0.071"). Board layout and lead spacing are compatible.

Q: Do the parts have identical electrical characteristics?

A: Yes. Resistance (442 Ohms), tolerance (±1%), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C to 155°C) are identical across both parts.

Q: What is the difference between the RNF and RNMF series?

A: The RNMF series is designated as "Mini" within Stackpole's product line. Both series use metal film construction with flame retardant coating and identical electrical specifications for the 442 Ohm value.

Q: Are both parts RoHS compliant?

A: Yes. Both the RNF18FTD442R and RNMF14FTD442R are ROHS3 compliant and REACH unaffected.