CTX100-4 Equivalent & Substitute Parts

Part Overview

The CTX100-4 is an unshielded 2-coil inductor array manufactured by Eaton - Electronics Division in the OCTA-PAC® series. This surface mount component provides dual inductance configurations: 396.9 µH in series connection and 99.23 µH in parallel connection, with a maximum parallel DC resistance of 302 mOhm and parallel current rating of 920 mA. The CTX100-4 is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to support ongoing design requirements, procurement continuity, and system maintenance where original components are no longer available through standard distribution channels.

Substiute Parts

CTX100-4

Eaton - Electronics DivisionIn Stock: 1860CTX100-4 Datasheet

Current PartRFQ

CTX100-4-R

Eaton - Electronics DivisionIn Stock: 5389CTX100-4-R Datasheet

DirectRFQ

4448-128L

API Delevan Inc.In Stock: 8494448-128L Datasheet

SimilarRFQ

SLF12555T-101M1R1-PF

TDK CorporationIn Stock: 6241SLF12555T-101M1R1-PF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CTX100-4 are identified based on electrical and mechanical compatibility within the following criteria:

Primary Substitution Criteria:

• Number of coils: 2-coil configuration
• Inductance values: Parallel configuration at or near 99.23 µH; Series configuration at or near 396.9 µH
• Current rating capability: Parallel current rating of 920 mA minimum
• DC resistance: Parallel DCR at or below 302 mOhm maximum
• Mounting type: Surface mount
• Operating temperature range: Minimum -40°C to 85°C coverage
• Shielding configuration: Unshielded topology

Substitute Classification:

Direct Equivalent: CTX100-4-R represents an identical electrical and mechanical specification to the CTX100-4, differing only in packaging format (Tape & Reel versus standard packaging) and product status (Active versus Obsolete). This part maintains all electrical parameters, physical dimensions, and performance characteristics.

Similar Equivalent: 4448-128L (API Delevan Inc.) and SLF12555T-101M1R1-PF (TDK Corporation) provide functional substitution with allowable parameter variations. These parts meet the core inductance and current requirements but introduce variations in tolerance, temperature range, shielding, and physical dimensions that require engineering evaluation for specific application contexts.

Parameter Comparison

Engineering Selection Recommendations

CTX100-4-R (Direct Equivalent - Recommended Primary Substitute)

The CTX100-4-R is the direct functional equivalent of the CTX100-4, maintaining identical electrical specifications across all inductance configurations, current ratings, and DC resistance parameters. The CTX100-4-R differs only in packaging format (Tape & Reel) and product status (Active). The CTX100-4-R carries ROHS3 compliance certification, providing regulatory advantage over the original obsolete part. This part is recommended as the primary substitute for all applications where the CTX100-4 was originally specified. Active product status ensures ongoing availability and supply chain continuity.

4448-128L (Similar Equivalent - Conditional Substitution)

The 4448-128L from API Delevan Inc. provides functional substitution with minor inductance variations: 100 µH parallel (versus 99.23 µH) and 400 µH series (versus 396.9 µH). These variations fall within acceptable engineering tolerance for most applications. The 4448-128L offers improved tolerance specification (±15% versus ±20%), extended operating temperature range (-55°C to 125°C), and active product status. Physical dimensions differ slightly (13.46mm x 13.46mm versus 13.97mm x 13.97mm footprint; 7.87mm versus 6.35mm height), requiring PCB layout verification. Moisture sensitivity level is elevated to 5A (24 Hours), requiring controlled storage and handling procedures. This part is suitable for applications where minor inductance variation and dimensional differences are acceptable.

SLF12555T-101M1R1-PF (Similar Equivalent - Limited Substitution)

The SLF12555T-101M1R1-PF from TDK Corporation is a single-coil inductor with 100 µH inductance and 1.8 A current rating. This part does not provide dual-coil configuration or series/parallel connection capability of the original CTX100-4. The SLF12555T-101M1R1-PF is classified as obsolete product status. Shielded construction differs from the unshielded topology of the CTX100-4. This part is suitable only for applications requiring single 100 µH inductance at higher current capacity (1.8 A) and does not provide functional equivalence for dual-coil array applications. ROHS3 compliance and unlimited moisture sensitivity level are provided.

Frequently Asked Questions (FAQ)

Q: Can CTX100-4-R be used as a direct replacement for CTX100-4 in all applications?

A: Yes. The CTX100-4-R maintains identical electrical specifications including inductance values (99.23 µH parallel, 396.9 µH series), current ratings (920 mA parallel, 460 mA series), DC resistance (302 mOhm parallel, 1.21 Ohm series), operating temperature range (-40°C to 85°C), and physical dimensions (13.97mm x 13.97mm x 6.35mm height). The only differences are packaging format (Tape & Reel) and product status (Active). No circuit redesign or PCB layout modification is required.

Q: What are the key differences between CTX100-4 and 4448-128L?

A: The 4448-128L provides similar but not identical electrical performance. Inductance values are slightly higher: 100 µH parallel (0.77% higher than 99.23 µH) and 400 µH series (0.78% higher than 396.9 µH). Tolerance is tighter (±15% versus ±20%). Operating temperature range is extended (-55°C to 125°C versus -40°C to 85°C). Physical dimensions differ: 13.46mm x 13.46mm footprint (0.51mm smaller) and 7.87mm height (1.52mm taller). Moisture sensitivity level is higher (5A requiring 24-hour controlled storage). These differences require engineering evaluation for specific applications.

Q: Why is SLF12555T-101M1R1-PF listed as a substitute if it is a single-coil inductor?

A: The SLF12555T-101M1R1-PF is listed as a similar equivalent based on the provided input data. However, this part does not provide functional equivalence for applications requiring dual-coil array configuration or series/parallel connection capability. This part is suitable only for applications requiring single 100 µH inductance at higher current capacity (1.8 A). Engineering evaluation is required to determine applicability to specific circuit requirements.

Q: What is the impact of the 4448-128L's higher moisture sensitivity level (5A)?

A: Moisture sensitivity level 5A requires controlled storage and handling procedures. Components must be stored in dry conditions and used within 24 hours of opening the original packaging. This contrasts with the CTX100-4 and CTX100-4-R, which have unlimited moisture sensitivity (MSL 1). Organizations using the 4448-128L must implement moisture control procedures including desiccant storage, humidity monitoring, and bake-out procedures if exposure to moisture occurs.

Q: Are there any RoHS compliance considerations when substituting parts?

A: The CTX100-4 is RoHS non-compliant. The CTX100-4-R is ROHS3 compliant, providing regulatory advantage for new designs and applications subject to RoHS requirements. The 4448-128L is RoHS non-compliant. The SLF12555T-101M1R1-PF is ROHS3 compliant. Selection should consider applicable regulatory requirements for the end application.

Q: Can the CTX100-4 be used in applications requiring the extended temperature range of 4448-128L?

A: No. The CTX100-4 operating temperature range is -40°C to 85°C. Applications requiring operation at temperatures below -40°C or above 85°C require substitution with parts offering extended temperature range, such as the 4448-128L (-55°C to 125°C). The original CTX100-4 specification does not support extended temperature operation.

Q: What packaging formats are available for these substitute parts?

A: CTX100-4-R is supplied in Tape & Reel (TR) format. The 4448-128L is supplied in Tape & Reel (TR) format. The SLF12555T-101M1R1-PF is supplied in Cut Tape (CT) and Digi-Reel® format. Packaging format selection depends on manufacturing process requirements and component handling equipment compatibility.