CF18JT2R40 Equivalent & Substitute Parts

Part Overview

The CF18JT2R40 is a 2.4 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 applications requiring precision resistance values in compact form factors. The part maintains Active product status with 1090 units currently in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit designs.

Substiute Parts

CF18JT2R40

Stackpole Electronics IncIn Stock: 1184CF18JT2R40 Datasheet

Current PartRFQ

CFM14JT2R40

Stackpole Electronics IncIn Stock: 10799CFM14JT2R40 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CF18JT2R40 are identified based on the following critical parameters that determine functional equivalence:

• Resistance Value: Must be 2.4 Ohms
• Tolerance: Must be ±5%
• Composition: Carbon Film construction
• Package Type: Axial through-hole configuration
• Temperature Range: Operating range of -55°C to 155°C
• Temperature Coefficient: ±400ppm/°C
• Compliance: ROHS3 Compliant, REACH Unaffected

The CFM14JT2R40 qualifies as a substitute based on matching all electrical and mechanical parameters. The primary distinction is the power rating upgrade from 1/8W to 1/4W, which represents a higher power dissipation capability while maintaining identical resistance, tolerance, composition, and package specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the CF18JT2R40 and CFM14JT2R40 maintain Active product status and full ROHS3 compliance with REACH Unaffected designation. Selection between these parts depends on circuit power dissipation requirements. The CF18JT2R40 is suitable for applications with power dissipation up to 0.125W. The CFM14JT2R40 provides increased thermal headroom with 0.25W capability, making it applicable to circuits requiring higher power handling at the same 2.4 Ohm resistance value. Both parts share identical electrical characteristics, temperature performance, and regulatory compliance, ensuring functional interchangeability within their respective power ratings.

Frequently Asked Questions (FAQ)

Q: Can CFM14JT2R40 directly replace CF18JT2R40 in existing designs?

A: Yes. The CFM14JT2R40 is electrically and mechanically equivalent to the CF18JT2R40. The higher power rating (1/4W vs 1/8W) provides additional thermal margin without affecting circuit performance. Direct substitution is valid for all applications where the original 1/8W rating was specified.

Q: What is the primary difference between CF18JT2R40 and CFM14JT2R40?

A: The sole difference is the power rating. CF18JT2R40 is rated at 0.125W (1/8W), while CFM14JT2R40 is rated at 0.25W (1/4W). All other specifications—resistance value, tolerance, composition, package type, temperature range, and compliance certifications—are identical.

Q: Are there any package or footprint differences between these parts?

A: No. Both parts use identical axial through-hole packaging with the same physical dimensions (0.067" diameter × 0.130" length). PCB layout and component placement require no modification when substituting between these parts.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both CF18JT2R40 and CFM14JT2R40 are ROHS3 Compliant and REACH Unaffected, meeting identical environmental and regulatory standards.

Q: When should I select the higher power-rated CFM14JT2R40 over the CF18JT2R40?

A: Select CFM14JT2R40 when circuit analysis indicates power dissipation approaching or exceeding 0.1W, or when thermal margin is required for reliability in high-temperature environments. For applications with power dissipation well below 0.1W, either part is acceptable.