CTX15-4 Equivalent & Substitute Parts Reference

Part Overview

The CTX15-4 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: 56.64 µH in series connection and 14.16 µH in parallel connection, with a maximum DC resistance of 24 mOhm in parallel mode and 96 mOhm in series mode. The CTX15-4 is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production builds and field replacements where the original part is no longer actively manufactured.

Substiute Parts

CTX15-4

Eaton - Electronics DivisionIn Stock: 1127CTX15-4 Datasheet

Current PartRFQ

CTX15-4-R

Eaton - Electronics DivisionIn Stock: 1758CTX15-4-R Datasheet

DirectRFQ

4448-116L

API Delevan Inc.In Stock: 10794448-116L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CTX15-4 are classified based on electrical parameter compatibility and mechanical interchangeability. The primary substitution criteria are:

Electrical Parameters:

• Inductance values in both parallel and series configurations must fall within acceptable tolerance ranges for the application
• DC resistance (DCR) specifications must not exceed the maximum ratings
• Current ratings must support the intended circuit requirements
• Operating temperature range must encompass the application environment

Mechanical Parameters:

• Surface mount mounting type (required for PCB compatibility)
• Package dimensions and height must permit physical placement without interference
• Unshielded configuration (consistent with original design)
• Two-coil array configuration

Compliance Parameters:

• RoHS and REACH compliance status where applicable
• Moisture sensitivity level suitable for handling and storage conditions

Substitutes are grouped into two categories: direct manufacturer equivalents and similar cross-manufacturer alternatives.

Parameter Comparison

Engineering Selection Recommendations

CTX15-4-R (Direct Equivalent - Recommended Primary Substitute)

The CTX15-4-R is the direct functional equivalent manufactured by Eaton - Electronics Division. This part maintains identical electrical specifications: 14.16 µH parallel inductance, 56.64 µH series inductance, ±20% tolerance, and matching DC resistance and current ratings. The CTX15-4-R is classified as active product status, ensuring long-term availability and supply chain continuity. The primary distinction is packaging format: CTX15-4-R is supplied in Tape & Reel (TR) configuration versus bulk packaging for the original part. The CTX15-4-R achieves ROHS3 compliance, providing environmental regulatory advantage over the non-compliant original. Mechanical dimensions and MSL rating are identical. This substitute provides direct pin-for-pin and functional compatibility with no design modifications required.

4448-116L (Cross-Manufacturer Alternative)

The 4448-116L manufactured by API Delevan Inc. provides functional substitution with minor inductance variations within acceptable tolerance ranges. Parallel inductance is 15 µH (versus 14.16 µH, representing 5.9% increase) and series inductance is 60 µH (versus 56.64 µH, representing 5.9% increase). The ±15% tolerance specification of the 4448-116L accommodates these variations within acceptable engineering margins. DC resistance, current ratings, and mounting type are identical. The 4448-116L offers extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 85°C), providing thermal performance advantage for applications requiring broader environmental operation. Physical dimensions differ slightly: 0.530" x 0.530" footprint (versus 0.550" x 0.550") and 0.310" height (versus 0.250"), requiring PCB layout verification for spatial compatibility. MSL rating is 5A (24 Hours), requiring controlled storage conditions compared to unlimited MSL of the original. This substitute is suitable for applications where minor inductance variation is acceptable and PCB layout permits the dimensional differences.

Frequently Asked Questions (FAQ)

Q: Can CTX15-4-R be used as a direct replacement for CTX15-4 without design changes?

A: Yes. The CTX15-4-R maintains identical electrical specifications and mechanical dimensions. The only difference is packaging format (Tape & Reel versus bulk). No circuit design modifications are required. PCB layout and component placement remain unchanged.

Q: What is the significance of the product status change from Obsolete to Active?

A: Product status indicates manufacturing and supply availability. The CTX15-4 (Obsolete) is no longer actively produced by Eaton. The CTX15-4-R (Active) is currently manufactured and supported, ensuring reliable long-term supply for production builds and field service requirements.

Q: Can 4448-116L be used in place of CTX15-4?

A: Conditional substitution is possible with engineering verification. The 4448-116L inductance values differ by approximately 5.9% (15 µH parallel versus 14.16 µH, and 60 µH series versus 56.64 µH). These variations fall within the ±15% tolerance specification of the 4448-116L and may be acceptable depending on circuit design margins. Physical dimensions differ: footprint is 0.530" x 0.530" (versus 0.550" x 0.550") and height is 0.310" (versus 0.250"). PCB layout must be verified to confirm spatial compatibility. Application-specific circuit analysis is required to confirm functional suitability.

Q: What are the packaging implications of using CTX15-4-R?

A: The CTX15-4-R is supplied in Tape & Reel (TR) format, standard for automated assembly processes. The original CTX15-4 is supplied in bulk packaging. For high-volume production, Tape & Reel format provides advantages in automated pick-and-place operations. For manual assembly or low-volume builds, bulk packaging may be preferred. Component functionality is identical regardless of packaging format.

Q: How do RoHS compliance differences affect part selection?

A: The CTX15-4-R achieves ROHS3 compliance, meeting current environmental regulations for electronic components. The original CTX15-4 and 4448-116L are RoHS non-compliant. For applications subject to RoHS regulatory requirements or customer specifications mandating RoHS compliance, the CTX15-4-R is the appropriate selection. For legacy systems or applications without RoHS requirements, non-compliant parts remain functionally suitable.

Q: What is the impact of MSL rating differences?

A: MSL (Moisture Sensitivity Level) rating indicates moisture absorption characteristics and handling requirements. CTX15-4 and CTX15-4-R have MSL 1 (Unlimited), permitting indefinite storage without moisture control. The 4448-116L has MSL 5A (24 Hours), requiring controlled humidity storage and bake-out procedures before soldering if storage exceeds 24 hours. For applications with standard warehouse storage conditions, MSL 1 parts are preferred. MSL 5A parts require specialized handling procedures.

Q: Are there thermal performance differences between substitutes?

A: The 4448-116L specifies extended operating temperature range (-55°C ~ 125°C) compared to CTX15-4 and CTX15-4-R (-40°C ~ 85°C). For applications requiring operation at temperatures below -40°C or above 85°C, the 4448-116L provides thermal capability advantage. For standard industrial temperature ranges (-40°C to 85°C), all three parts are thermally suitable.

Q: What inventory considerations apply to part selection?

A: Current inventory levels are: CTX15-4 (1074 pcs), CTX15-4-R (1707 pcs), and 4448-116L (1020 pcs). All parts are available in stock. For immediate requirements, CTX15-4-R offers highest inventory availability. Long-term supply planning should prioritize CTX15-4-R due to active product status.