TTH5018RJ Equivalent & Substitute Parts

Part Overview

The TTH5018RJ is an 18 Ohms ±5% 50W wirewound chassis mount resistor manufactured by TE Connectivity AMP Connectors. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing applications. The TTH5018RJ features vitreous enamel coating, solder lug termination, and radial tubular packaging suitable for high-power dissipation applications requiring flame-proof construction.

Substiute Parts

TTH5018RJ

TE Connectivity AMP ConnectorsIn Stock: 1175TTH5018RJ Datasheet

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TE50B18RJ

TE Connectivity Passive ProductIn Stock: 843TE50B18RJ Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TTH5018RJ is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Resistance value: 18 Ohms
• Tolerance: ±5%
• Power rating: 50W
• Composition: Wirewound

Environmental & Mechanical Parameters:

• Lead style: Solder Lugs
• Package configuration: Radial, Tubular
• Flame-proof and safety features
• RoHS3 compliance

The substitute part TE50B18RJ maintains electrical equivalence across all primary specifications. Variations in temperature coefficient (±440ppm/°C versus ±400ppm/°C) and maximum operating temperature (-55°C ~ 155°C versus -55°C ~ 200°C) represent secondary parameter differences. The coating material differs (silicone versus vitreous enamel), and the substitute includes brackets as a mounting feature, whereas the original part does not include brackets.

Parameter Comparison

Engineering Selection Recommendations

The TE50B18RJ serves as the primary equivalent substitute for the obsolete TTH5018RJ. Both components maintain identical electrical specifications: 18 Ohms resistance, ±5% tolerance, and 50W power rating in wirewound construction with solder lug termination.

Compliance Considerations: Both parts are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8533.29.0000) classifications, supporting regulatory equivalence for procurement and deployment.

Operating Condition Constraints: Applications requiring operation above 155°C must evaluate the reduced maximum operating temperature of the TE50B18RJ (-55°C ~ 155°C) against the original TTH5018RJ specification (-55°C ~ 200°C). The temperature coefficient differential (±440ppm/°C versus ±400ppm/°C) introduces minimal variance in resistance stability across standard operating ranges.

Physical Integration: The TE50B18RJ includes integrated brackets as a mounting feature, whereas the TTH5018RJ does not include brackets. Mechanical mounting configurations must accommodate this difference. Dimensional specifications are provided for the TE50B18RJ (1.102" Dia x 4.016" L) to support physical layout verification.

Coating Material Difference: The substitute employs silicone coating in place of vitreous enamel coating. Applications with specific environmental exposure requirements must confirm coating material compatibility with intended operating conditions.

Frequently Asked Questions (FAQ)

Q: Can the TE50B18RJ directly replace the TTH5018RJ in all applications?

A: The TE50B18RJ provides electrical equivalence across resistance, tolerance, and power rating specifications. Applications operating below 155°C and compatible with silicone coating can utilize this substitute. Applications requiring operation above 155°C or dependent on vitreous enamel coating properties require additional evaluation.

Q: What is the significance of the temperature coefficient difference between these parts?

A: The TTH5018RJ specifies ±400ppm/°C while the TE50B18RJ specifies ±440ppm/°C. This 40ppm/°C differential represents a 10% variance in temperature stability. For precision applications with tight resistance tolerance requirements across temperature extremes, this difference may be significant.

Q: Are the physical dimensions compatible between these parts?

A: The TE50B18RJ provides documented dimensions (1.102" Dia x 4.016" L). The TTH5018RJ dimensions are not specified in available documentation. Physical verification is necessary to confirm mechanical compatibility in existing mounting configurations.

Q: Does the inclusion of brackets on the TE50B18RJ affect substitution?

A: The TE50B18RJ includes brackets as a mounting feature, while the TTH5018RJ does not. Existing mechanical designs must accommodate this difference. The brackets may require removal or modification depending on the application's mounting requirements.

Q: Are both parts RoHS compliant?

A: Both the TTH5018RJ and TE50B18RJ are ROHS3 compliant, supporting equivalent regulatory status for procurement and deployment in RoHS-restricted applications.

Q: What is the maximum operating temperature difference between these parts?

A: The TTH5018RJ operates to 200°C maximum, while the TE50B18RJ operates to 155°C maximum. This 45°C difference may be critical for high-temperature applications. Verify application operating conditions against the TE50B18RJ specification before substitution.