CTX8-4-R Equivalent & Substitute Parts

Part Overview

The CTX8-4-R is an unshielded 2-coil inductor array manufactured by Eaton - Electronics Division, part of the OCTA-PAC® series. This surface mount component provides dual inductance configurations: 33.12 µH in series connection and 8.28 µH in parallel connection, with a maximum DC resistance of 18mOhm in parallel mode. The part is currently active in production with 718 pieces available in inventory.

Substitute parts become necessary when the CTX8-4-R reaches end-of-life status, when supply chain constraints limit availability, or when design requirements necessitate alternative electrical or mechanical characteristics within the allowed parameter ranges for this inductor array category.

Substiute Parts

CTX8-4-R

Eaton - Electronics DivisionIn Stock: 814CTX8-4-R Datasheet

Current PartRFQ

SLF12555T-330M1R9-PF

TDK CorporationIn Stock: 2892SLF12555T-330M1R9-PF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The SLF12555T-330M1R9-PF from TDK Corporation qualifies as a substitute based on the following electrical and mechanical compatibility criteria:

Inductance Alignment: The substitute part provides 33 µH inductance, which corresponds to the series-connected configuration of the CTX8-4-R (33.12 µH). This inductance value falls within the functional range required for applications designed around the main part's series mode operation.

Current Rating Compatibility: The substitute part supports 3.1 A current rating, which is compatible with the parallel-mode current rating of the CTX8-4-R (3.5 A) and exceeds the series-mode requirement (1.75 A).

DC Resistance Parameters: The substitute part specifies 49.8mOhm maximum DCR, which is higher than the CTX8-4-R parallel mode (18mOhm) but acceptable for applications where the series-mode DCR specification (72mOhm) is the design constraint.

Tolerance and Environmental Specifications: Both parts share ±20% tolerance and ROHS3 compliance. The substitute part operates across -40°C ~ 105°C, which encompasses the CTX8-4-R operating range of -40°C ~ 85°C.

Moisture Sensitivity: Both parts carry MSL 1 (Unlimited) rating, ensuring equivalent handling and storage requirements.

Shielding Difference: The substitute part is shielded, whereas the CTX8-4-R is unshielded. This represents a functional enhancement for EMI-sensitive applications.

Parameter Comparison

Engineering Selection Recommendations

For Active Production and New Designs: The CTX8-4-R remains the primary selection due to its active product status. Eaton maintains current manufacturing and supply chain support for this component.

For Legacy System Maintenance: The SLF12555T-330M1R9-PF serves as a functional substitute when CTX8-4-R availability is constrained. Despite its obsolete status, the part maintains electrical compatibility within the specified parameter ranges and carries equivalent compliance certifications (ROHS3, MSL 1).

Compliance Considerations: Both parts meet ROHS3 requirements and carry identical moisture sensitivity ratings, ensuring equivalent handling protocols and environmental compliance in manufacturing environments.

Packaging and Inventory: The CTX8-4-R is supplied in Tape & Reel format with 718 pieces currently in stock. The SLF12555T-330M1R9-PF is supplied in Cut Tape format with 2800 pieces available. Packaging format selection depends on assembly line requirements and volume needs.

Frequently Asked Questions (FAQ)

Q: Can the SLF12555T-330M1R9-PF directly replace the CTX8-4-R in all applications?

A: The SLF12555T-330M1R9-PF provides electrical compatibility for applications designed around the CTX8-4-R's series inductance configuration (33.12 µH). However, applications requiring the parallel configuration (8.28 µH) cannot use this substitute. The substitute's shielded design may alter EMI characteristics in sensitive circuits compared to the unshielded main part.

Q: What is the significance of the CTX8-4-R being a 2-coil array versus the SLF12555T-330M1R9-PF being a single inductor?

A: The CTX8-4-R provides dual inductance values through series and parallel connection options within a single package. The SLF12555T-330M1R9-PF is a fixed single-value inductor. Applications requiring switchable inductance configurations must retain the CTX8-4-R; applications requiring only the 33 µH value can use the substitute.

Q: How do the DC resistance specifications affect circuit performance?

A: The CTX8-4-R parallel mode specifies 18mOhm maximum DCR, while the substitute specifies 49.8mOhm. Higher DCR increases power dissipation and heat generation. Applications with strict power budget or thermal constraints should verify that the substitute's higher DCR remains acceptable for the intended current levels.

Q: Are there packaging considerations when switching between these parts?

A: The CTX8-4-R uses Tape & Reel packaging; the SLF12555T-330M1R9-PF uses Cut Tape packaging. Assembly equipment compatibility and handling procedures may differ. Verify that your manufacturing process supports the substitute's packaging format.

Q: What does the obsolete status of the SLF12555T-330M1R9-PF mean for long-term supply?

A: Obsolete status indicates that TDK has discontinued active production. While current inventory exists (2800 pieces), future availability is not guaranteed. For applications requiring long-term supply security, the active CTX8-4-R is the recommended choice.

Q: Can the substitute's extended operating temperature range (-40°C ~ 105°C) be relied upon?

A: The substitute supports a wider temperature range than the CTX8-4-R (-40°C ~ 85°C). However, applications should be designed to the CTX8-4-R's specified range unless the substitute is formally qualified for the extended temperature operation in your specific circuit design.