CTX25-4 Equivalent & Substitute Parts Reference

Part Overview

The CTX25-4 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: 103.68 µH in series connection and 25.92 µH in parallel connection, with a maximum parallel current rating of 2 A. The CTX25-4 is classified as obsolete product status, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance across both series and parallel configurations while accommodating the nonstandard package dimensions and surface mount requirements.

Substiute Parts

CTX25-4

Eaton - Electronics DivisionIn Stock: 1236CTX25-4 Datasheet

Current PartRFQ

CTX25-4-R

Eaton - Electronics DivisionIn Stock: 13707CTX25-4-R Datasheet

DirectRFQ

4448-120L

API Delevan Inc.In Stock: 8474448-120L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CTX25-4 are classified based on electrical and mechanical parameter alignment. The substitution logic is structured as follows:

Direct Equivalent (Same Manufacturer): CTX25-4-R maintains identical electrical specifications across all critical parameters: 2-coil configuration, 25.92 µH parallel inductance, 103.68 µH series inductance, 2 A parallel current rating, 1 A series current rating, 63 mOhm maximum parallel DCR, and 253 mOhm maximum series DCR. Physical dimensions, shielding characteristics, and mounting type are identical. The primary distinction is packaging format (Tape & Reel versus unspecified) and product status (Active versus Obsolete). RoHS compliance differs: CTX25-4-R is ROHS3 compliant while CTX25-4 is non-compliant.

Similar Substitute (Cross-Manufacturer): 4448-120L manufactured by API Delevan Inc. provides comparable but not identical electrical performance. This part maintains the 2-coil configuration, 2 A parallel current rating, and 1 A series current rating. Inductance values differ slightly: 25 µH parallel (versus 25.92 µH) and 100 µH series (versus 103.68 µH). DC resistance specifications are comparable: 64 mOhm maximum parallel DCR (versus 63 mOhm) and 254 mOhm maximum series DCR (versus 253 mOhm). Physical dimensions vary: 0.530" L x 0.530" W (13.46mm x 13.46mm) with 0.310" height (7.87mm) versus the CTX25-4 dimensions of 0.550" x 0.550" x 0.250". Operating temperature range is broader (-55°C ~ 125°C versus -40°C ~ 85°C). Tolerance is tighter (±15% versus ±20%). RoHS compliance status differs, and moisture sensitivity level is higher (5A versus 1).

Parameter Comparison

Engineering Selection Recommendations

CTX25-4-R Selection Criteria: CTX25-4-R is the primary substitute for obsolete CTX25-4 applications. Both parts are manufactured by Eaton - Electronics Division and maintain identical electrical specifications across all critical parameters: inductance values, current ratings, and DC resistance limits. Physical dimensions and mounting characteristics are identical. CTX25-4-R holds Active product status, ensuring long-term availability and supply chain continuity. CTX25-4-R achieves ROHS3 compliance, meeting current regulatory requirements for new designs and manufacturing processes. Selection of CTX25-4-R is appropriate for direct replacement in existing designs without circuit modification.

4448-120L Selection Criteria: 4448-120L by API Delevan Inc. serves as a secondary substitute when CTX25-4-R availability is constrained or when design parameters accommodate the specified variations. Inductance tolerance is tighter (±15% versus ±20%), providing improved consistency. Operating temperature range is extended (-55°C ~ 125°C versus -40°C ~ 85°C), supporting applications requiring broader thermal performance. Physical dimensions differ: 4448-120L is slightly smaller in length and width (0.530" versus 0.550") but taller (0.310" versus 0.250"), requiring PCB layout verification. Inductance values differ within tolerance: 25 µH parallel (1.1% lower) and 100 µH series (3.5% lower). DC resistance specifications remain within acceptable limits. Moisture sensitivity level is higher (5A versus 1), requiring controlled storage and handling procedures. RoHS non-compliance status matches the original CTX25-4. Selection of 4448-120L requires circuit analysis to confirm inductance variation tolerance and PCB footprint accommodation.

Frequently Asked Questions (FAQ)

Q: Can CTX25-4-R directly replace CTX25-4 without circuit modification?

A: Yes. CTX25-4-R maintains identical electrical specifications for both series and parallel inductance configurations, current ratings, and DC resistance limits. Physical dimensions and mounting type are identical. Direct substitution is supported without circuit redesign.

Q: What are the key differences between CTX25-4 and 4448-120L?

A: Primary differences include: (1) Inductance values—4448-120L provides 25 µH parallel and 100 µH series versus 25.92 µH and 103.68 µH respectively; (2) Physical dimensions—4448-120L is 0.530" x 0.530" x 0.310" versus 0.550" x 0.550" x 0.250"; (3) Operating temperature range—4448-120L extends to -55°C ~ 125°C versus -40°C ~ 85°C; (4) Tolerance—4448-120L offers ±15% versus ±20%; (5) Moisture sensitivity—4448-120L is rated 5A versus 1. These variations require circuit analysis and PCB layout verification before substitution.

Q: Is inductance variation between CTX25-4 and 4448-120L acceptable for my application?

A: Inductance variation depends on circuit requirements. CTX25-4 parallel inductance is 25.92 µH; 4448-120L provides 25 µH (1.1% lower). CTX25-4 series inductance is 103.68 µH; 4448-120L provides 100 µH (3.5% lower). Both parts operate within their specified tolerances. Circuit analysis must confirm whether these differences fall within acceptable performance margins for your specific application.

Q: What packaging formats are available for substitute parts?

A: CTX25-4-R is supplied in Tape & Reel (TR) format. 4448-120L is supplied in Tape & Reel (TR) format. Original CTX25-4 packaging format is unspecified. Verify packaging compatibility with your assembly process requirements.

Q: Are there RoHS compliance considerations for substitute selection?

A: CTX25-4-R is ROHS3 compliant, meeting current regulatory requirements. Original CTX25-4 and 4448-120L are both RoHS non-compliant. For new designs or applications requiring RoHS compliance, CTX25-4-R is the appropriate selection.

Q: What is the moisture sensitivity impact of selecting 4448-120L?

A: CTX25-4 and CTX25-4-R are rated MSL 1 (Unlimited), requiring no special moisture control. 4448-120L is rated MSL 5A (24 Hours), requiring controlled storage at specified humidity levels and limited floor-life exposure after packaging opening. Implementation of 4448-120L requires adherence to moisture handling procedures per IPC-A-610 standards.

Q: Can 4448-120L accommodate the same PCB footprint as CTX25-4?

A: Physical dimensions differ. CTX25-4 is 0.550" L x 0.550" W x 0.250" H; 4448-120L is 0.530" L x 0.530" W x 0.310" H. While length and width are slightly smaller, height is greater. PCB layout verification is required to confirm clearance and component placement compatibility.

Q: What is the current inventory status for substitute parts?

A: CTX25-4-R inventory is 13,600 pieces (Active status). 4448-120L inventory is 743 pieces (Active status). Original CTX25-4 inventory is 1,126 pieces (Obsolete status). Procurement planning should prioritize CTX25-4-R for long-term supply assurance.