CTX32CT-680-R Equivalent & Substitute Parts

Part Overview

The CTX32CT-680-R is a 68 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 120 mA continuous current with a maximum DC resistance of 3.7 Ohm, housed in a 1210 (3225 Metric) package. The product is classified as obsolete, necessitating identification of active equivalent components for ongoing design support and procurement continuity.

Substiute Parts

CTX32CT-680-R

Eaton - Electronics DivisionIn Stock: 1060CTX32CT-680-R Datasheet

Current PartRFQ

CM322522-680JL

Bourns Inc.In Stock: 1268CM322522-680JL Datasheet

SimilarRFQ

CM322522-680KL

Bourns Inc.In Stock: 14070CM322522-680KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CTX32CT-680-R is based on the following critical parameters:

Mandatory Matching Parameters:

• Inductance value: 68 µH
• Package / Case: 1210 (3225 Metric) with matching physical dimensions (0.126" L x 0.098" W, 0.087" Max height)
• Mounting Type: Surface Mount
• Shielding: Unshielded
• Core Type: Drum Core, Wirewound

Allowable Variation Parameters:

• Current Rating: Substitute must support minimum 120 mA; higher ratings are acceptable
• DC Resistance (DCR): Substitute must not exceed 3.7 Ohm Max; lower values are acceptable
• Tolerance: ±5% or ±10% acceptable
• Operating Temperature: Extended range acceptable
• Core Material: Ceramic or Ferrite acceptable for unshielded drum core construction

The identified substitute parts CM322522-680JL and CM322522-680KL from Bourns Inc. meet the mandatory matching criteria. However, both substitutes present a current rating of 65 mA, which is below the 120 mA requirement of the original part.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility Assessment:

The Bourns CM322522-680JL and CM322522-680KL parts provide active product alternatives to the obsolete CTX32CT-680-R. Both substitutes maintain identical inductance values, physical dimensions, and mounting characteristics. The Bourns components offer extended operating temperature ranges (-40°C ~ 125°C versus -25°C ~ 85°C) and ROHS3 compliance, supporting modern regulatory requirements.

Critical Limitation:

Both substitute parts are rated for 65 mA maximum current, which is 55 mA below the original part's 120 mA rating. Additionally, the DC resistance of the substitutes is 9 Ohm Max compared to 3.7 Ohm Max for the original part, representing a 2.43x increase in resistance.

Selection Basis:

• CM322522-680KL is preferred for applications where ±10% inductance tolerance matches the original specification and where current demand does not exceed 65 mA.
• CM322522-680JL provides ±5% tolerance for applications requiring tighter inductance control, subject to the same 65 mA current limitation.

Both parts are active products with established supply chains and regulatory compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can the Bourns CM322522-680KL directly replace the CTX32CT-680-R in all applications?

A: Direct replacement is limited by current rating. The CTX32CT-680-R supports 120 mA continuous current, while the CM322522-680KL is rated for 65 mA. Substitution is valid only for circuits where the actual operating current does not exceed 65 mA. Additionally, the DC resistance increases from 3.7 Ohm to 9 Ohm, which affects power dissipation and circuit performance.

Q: What is the difference between CM322522-680JL and CM322522-680KL?

A: Both parts are identical in electrical performance and physical dimensions. The primary difference is inductance tolerance: CM322522-680JL specifies ±5% tolerance, while CM322522-680KL specifies ±10% tolerance. Selection depends on circuit tolerance requirements.

Q: Are the physical dimensions truly compatible?

A: Yes. Both Bourns substitutes maintain the same footprint (0.126" L x 0.098" W / 3.20mm x 2.50mm) and maximum seated height (0.087" / 2.20mm) as the original CTX32CT-680-R, ensuring PCB layout compatibility.

Q: What is the impact of increased DC resistance?

A: The increase from 3.7 Ohm to 9 Ohm results in higher resistive losses. At 65 mA, the original part dissipates approximately 31.2 mW, while the substitute dissipates approximately 38.1 mW. Circuit designs sensitive to inductor losses require evaluation of this parameter.

Q: Do the Bourns parts meet current regulatory requirements?

A: Yes. Both CM322522-680JL and CM322522-680KL are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What is the significance of the "Nonstandard" package designation for the Bourns parts?

A: The Bourns parts are designated as "Nonstandard" package despite matching the 1210 (3225 Metric) physical dimensions. This designation reflects Bourns' internal classification and does not affect mechanical or electrical compatibility with standard 1210 footprints.