CTX16-18405-R Equivalent & Substitute Parts

Part Overview

The CTX16-18405-R is a 140 µH unshielded toroidal inductor manufactured by Eaton - Electronics Division, rated for 3.2 A continuous current with a maximum DC resistance of 190mOhm. This component is designed for through-hole mounting in radial, horizontal configuration with 4 open leads. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Inductance	140	µH	Critical - must match exactly
Current Rating	3.2	A	Critical - substitute must meet or exceed
DC Resistance (DCR)	190	mOhm Max	Critical - affects power dissipation and circuit performance
Type	Toroidal	-	Critical - form factor and electromagnetic properties
Shielding	Unshielded	-	Critical - EMI characteristics
Mounting Type	Through Hole	-	Critical - PCB assembly compatibility
Package Configuration	Radial, Horizontal, 4 Leads (Open)	-	Critical - physical footprint and lead arrangement
Operating Temperature Range	-20°C ~ 105°C	-	Important - thermal operating envelope
Size / Dimension	0.827" Dia (21.00mm)	-	Important - PCB layout constraints
Height - Seated (Max)	0.433" (11.00mm)	-	Important - vertical clearance requirements

Substitute Part Grouping Explanation

Substitution eligibility for the CTX16-18405-R is determined by strict alignment of the following parameters:

Critical Matching Parameters:

Inductance value of 140 µH (exact match required)
Toroidal core type and unshielded configuration
Through-hole radial, horizontal mounting with 4 open leads
Current rating equal to or greater than 3.2 A
DC resistance not exceeding 190mOhm maximum

Compatibility Considerations:

Physical dimensions must accommodate existing PCB footprints and clearance requirements
Operating temperature range must encompass the application's thermal envelope
Lead configuration and spacing must be compatible with existing circuit board layouts

The ATCA-05-141M-H meets the core electrical requirements of inductance, current rating, and DC resistance specifications while maintaining identical mounting configuration and core type. Physical dimensions differ, requiring verification of PCB layout compatibility.

Parameter Comparison

Parameter	CTX16-18405-R (Eaton)	ATCA-05-141M-H (Abracon)	Match Status
Inductance	140 µH	140 µH	Exact Match
Current Rating	3.2 A	3.0 A	Substitute Below Specification
DC Resistance (DCR)	190 mOhm Max	64 mOhm Max	Substitute Superior
Type	Toroidal	Toroidal	Exact Match
Shielding	Unshielded	Unshielded	Exact Match
Mounting Type	Through Hole	Through Hole	Exact Match
Package Configuration	Radial, Horizontal, 4 Leads (Open)	Radial, Horizontal (Open)	Compatible
Operating Temperature Range	-20°C ~ 105°C	-40°C ~ 105°C	Substitute Extended Range
Size / Dimension	0.827" Dia (21.00mm)	1.181" Dia (30.00mm)	Substitute Larger
Height - Seated (Max)	0.433" (11.00mm)	0.669" (17.00mm)	Substitute Taller
Product Status	Obsolete	Active	Substitute Currently Available

Engineering Selection Recommendations

Substitution Feasibility:

The ATCA-05-141M-H from Abracon LLC is functionally equivalent to the CTX16-18405-R for applications where the current requirement does not exceed 3.0 A. The substitute part delivers superior DC resistance performance (64 mOhm versus 190 mOhm maximum), resulting in lower power dissipation and improved efficiency.

Critical Limitation:

The ATCA-05-141M-H current rating of 3.0 A falls below the original specification of 3.2 A. This part is suitable only for circuits designed to operate at or below 3.0 A continuous current. Applications requiring the full 3.2 A rating must source alternative components or accept the current derating.

Physical Compatibility:

The substitute part exhibits larger physical dimensions (30.00mm diameter versus 21.00mm, and 17.00mm height versus 11.00mm). PCB layout verification is required to confirm adequate clearance and mounting space availability.

Compliance and Availability:

The ATCA-05-141M-H is actively manufactured and carries RoHS3 compliance certification. The original CTX16-18405-R is obsolete, making the Abracon substitute the primary available option for new procurement and design continuity.

Frequently Asked Questions (FAQ)

Q: Can the ATCA-05-141M-H directly replace the CTX16-18405-R in all applications?

A: No. The substitute part is rated for 3.0 A maximum continuous current, compared to the original 3.2 A specification. Direct substitution is valid only for circuits operating at 3.0 A or below. Applications requiring 3.2 A operation must source alternative components.

Q: What are the physical footprint differences?

A: The ATCA-05-141M-H is larger in both diameter (30.00mm versus 21.00mm) and height (17.00mm versus 11.00mm). PCB layout must be verified to ensure adequate mounting space and clearance from adjacent components.

Q: Does the lower DC resistance of the substitute part affect circuit operation?

A: The ATCA-05-141M-H exhibits lower DC resistance (64 mOhm maximum versus 190 mOhm maximum), which reduces power dissipation and improves efficiency. This is a beneficial characteristic that does not negatively impact circuit compatibility.

Q: What is the operating temperature range difference?

A: The ATCA-05-141M-H operates from -40°C to 105°C, extending the lower temperature limit by 20°C compared to the original part (-20°C to 105°C). This expanded range provides additional thermal margin for demanding applications.

Q: Is the ATCA-05-141M-H currently available for procurement?

A: Yes. The ATCA-05-141M-H is actively manufactured by Abracon LLC and carries active product status. The original CTX16-18405-R is obsolete and no longer in production.

Q: Are there any compliance or certification differences?

A: The ATCA-05-141M-H carries RoHS3 compliance and REACH unaffected status. Both parts share identical ECCN and HTSUS classifications, ensuring regulatory compatibility for international procurement.

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