CF18JT3R90 Equivalent & Substitute Parts

Part Overview

The CF18JT3R90 is a 3.9 Ohm ±5% 1/8W axial through-hole resistor manufactured by Stackpole Electronics Inc. This carbon film resistor features flame retardant coating and safety characteristics, designed for general-purpose electronic applications requiring precise resistance values in compact form factors. The part maintains Active product status with 1064 units currently in stock. Substitute parts are identified to address application requirements for higher power dissipation or alternative packaging configurations while maintaining electrical compatibility.

Substiute Parts

CF18JT3R90

Stackpole Electronics IncIn Stock: 1076CF18JT3R90 Datasheet

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CFM14JT3R90

Stackpole Electronics IncIn Stock: 14476CFM14JT3R90 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CF18JT3R90 are qualified based on the following electrical and mechanical parameters:

Critical Parameters for Substitution:

• Resistance value: 3.9 Ohms (exact match required)
• Tolerance: ±5% (exact match required)
• Composition: Carbon Film (exact match required)
• Temperature Coefficient: ±400ppm/°C (exact match required)
• Operating Temperature Range: -55°C to 155°C (exact match required)
• Package Type: Axial (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

Variable Parameters Allowing Substitution:

• Power Rating: 0.125W (1/8W) to 0.25W (1/4W) — higher power rating provides enhanced thermal capability
• Packaging Format: Tape & Reel (TR) to Cut Tape (CT) — different supply configurations
• Series Designation: CF to CFM — product line variant

The CFM14JT3R90 qualifies as a direct substitute with identical electrical characteristics and enhanced power dissipation capability.

Parameter Comparison

Engineering Selection Recommendations

Both the CF18JT3R90 and CFM14JT3R90 maintain Active product status and full ROHS3 compliance, qualifying them for equivalent use in applications requiring 3.9 Ohm axial carbon film resistors. The CFM14JT3R90 provides increased power dissipation capacity at 0.25W compared to the 0.125W rating of the CF18JT3R90, making it suitable for circuits where thermal margin is a design consideration. Both parts operate across the identical temperature range of -55°C to 155°C with matching temperature coefficients. Selection between these parts depends on circuit power requirements and packaging supply format availability.

Frequently Asked Questions (FAQ)

Q: Can the CFM14JT3R90 replace the CF18JT3R90 in existing designs?

A: Yes. The CFM14JT3R90 is electrically equivalent with identical resistance, tolerance, temperature coefficient, and operating temperature range. The higher power rating (0.25W vs. 0.125W) provides additional thermal capability without affecting circuit performance.

Q: What is the primary difference between these two parts?

A: The CFM14JT3R90 has a higher power rating (0.25W) compared to the CF18JT3R90 (0.125W). Both parts share identical resistance values, tolerance, composition, and temperature characteristics. Packaging format differs: CF18JT3R90 is supplied in Tape & Reel format while CFM14JT3R90 is supplied in Cut Tape format.

Q: Are there any mechanical compatibility concerns when substituting?

A: Both parts use identical axial package geometry (0.067" diameter x 0.130" length). No mechanical modifications to PCB layouts or component placement are required for substitution.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the CF18JT3R90 and CFM14JT3R90 are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS coding (8533.10.0065).

Q: Which part should be selected for new designs?

A: Selection depends on circuit power dissipation requirements. For applications where the 0.125W rating is sufficient, either part is acceptable. For designs requiring additional thermal margin or operating in higher ambient temperatures, the CFM14JT3R90 is the appropriate choice.