CTX33-2 Equivalent & Substitute Parts

Part Overview

The CTX33-2 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: 127.09 µH when coils are connected in series and 31.77 µH when connected in parallel. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Substiute Parts

CTX33-2

Eaton - Electronics DivisionIn Stock: 1270CTX33-2 Datasheet

Current PartRFQ

CTX33-2-R

Eaton - Electronics DivisionIn Stock: 1525CTX33-2-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CTX33-2 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Inductance values in both series and parallel configurations must match exactly: 127.09 µH (series) and 31.77 µH (parallel)
• Current ratings must meet or exceed the original specifications: 1.4 A (parallel) and 700 mA (series)
• DC resistance (DCR) must not exceed the maximum values: 105 mOhm (parallel) and 420 mOhm (series)
• Tolerance specification: ±20%

Mechanical Equivalence Requirements:

• Number of coils: 2
• Shielding configuration: Unshielded
• Mounting type: Surface Mount
• Physical dimensions: 0.450" L × 0.450" W × 0.235" H
• Package type: Nonstandard (OCTA-PAC®)

Environmental & Compliance Requirements:

• Operating temperature range: -40°C to 85°C
• Moisture Sensitivity Level: 1 (Unlimited)

The CTX33-2-R meets all substitution criteria and is identified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: CTX33-2-R

The CTX33-2-R is the direct functional and mechanical equivalent of the obsolete CTX33-2. Selection of CTX33-2-R is based on the following engineering factors:

1. Electrical Equivalence: All inductance values, current ratings, and DC resistance specifications are identical to the original part.

2. Mechanical Compatibility: Physical dimensions, mounting type, and package configuration are identical, ensuring direct PCB layout compatibility without redesign.

3. Product Status: The CTX33-2-R is classified as Active, ensuring ongoing availability and manufacturing support from Eaton - Electronics Division.

4. Compliance Enhancement: The CTX33-2-R carries ROHS3 compliance certification, whereas the original CTX33-2 is RoHS non-compliant. This upgrade provides regulatory advantage for new production runs.

5. Packaging Flexibility: The CTX33-2-R is available in Tape & Reel (TR) format, which is standard for automated assembly processes, compared to the bulk packaging of the original part.

6. Environmental Certification: The CTX33-2-R includes REACH Unaffected status, providing additional regulatory documentation for supply chain compliance.

Frequently Asked Questions (FAQ)

Q: Can CTX33-2-R be used as a direct replacement for CTX33-2 without circuit modification?

A: Yes. The CTX33-2-R is electrically and mechanically identical to the CTX33-2. All inductance values, current ratings, DC resistance specifications, and physical dimensions match exactly. No circuit redesign or PCB layout changes are required.

Q: What is the difference between the CTX33-2 and CTX33-2-R?

A: The primary differences are product status, compliance certifications, and packaging format. The CTX33-2-R is an active product with ROHS3 compliance and REACH Unaffected status, whereas the CTX33-2 is obsolete and RoHS non-compliant. The CTX33-2-R is supplied in Tape & Reel format suitable for automated assembly, while the CTX33-2 was supplied in bulk packaging.

Q: Are there any electrical performance differences between CTX33-2 and CTX33-2-R?

A: No. Both parts have identical electrical specifications: 127.09 µH (series configuration), 31.77 µH (parallel configuration), 1.4 A current rating (parallel), 700 mA current rating (series), 105 mOhm maximum DCR (parallel), and 420 mOhm maximum DCR (series).

Q: What does the "-R" designation indicate in CTX33-2-R?

A: The "-R" suffix indicates Tape & Reel packaging format, which is the standard delivery method for surface mount components in high-volume production environments.

Q: Is the CTX33-2-R compatible with existing PCB designs for CTX33-2?

A: Yes. The CTX33-2-R has identical physical dimensions (0.450" L × 0.450" W × 0.235" H) and mounting type (Surface Mount), ensuring direct compatibility with existing PCB layouts without modification.

Q: What is the RoHS compliance status of CTX33-2-R?

A: The CTX33-2-R is ROHS3 compliant, meeting the Restriction of Hazardous Substances Directive requirements. This is an improvement over the original CTX33-2, which is RoHS non-compliant.

Q: Can I mix CTX33-2 and CTX33-2-R components in the same production batch?

A: While electrically and mechanically equivalent, mixing components from different product status classifications (obsolete vs. active) and compliance certifications is not recommended for production consistency. Use CTX33-2-R exclusively for new production runs.

Q: What is the Moisture Sensitivity Level (MSL) for CTX33-2-R?

A: The MSL rating is 1 (Unlimited), indicating no moisture sensitivity restrictions. The component can be stored and handled under standard conditions without special moisture control measures.

Q: Are there any temperature operating range differences between CTX33-2 and CTX33-2-R?

A: No. Both parts operate across the identical temperature range of -40°C to 85°C.