CMF-8033 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The CMF-8033 is a 3.3 mH common mode choke manufactured by Tamura, designed for 2-line filtering applications with a maximum current rating of 2A. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part features a vertical 4-pin configuration with a DC resistance of 170 mOhm and operates at 250V AC.

Substiute Parts

CMF-8033

TamuraIn Stock: 1130CMF-8033 Datasheet

Current PartRFQ

ET2432-024

Triad MagneticsIn Stock: 777ET2432-024 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMF-8033 is based on the following critical parameters that must be maintained or exceeded:

Mandatory Matching Parameters:

• Number of Lines: 2
• Current Rating: 2A minimum
• Voltage Rating - AC: 250V minimum
• Package / Case: Vertical, 4 PC Pin configuration
• Height: 1.220" (31.00 mm) maximum
• Inductance: 3.3 mH @ 1 kHz (tolerance range acceptable)
• DC Resistance: 170 mOhm maximum

The ET2432-024 from Triad Magnetics qualifies as a substitute based on these parameters. While the inductance is specified at 3.2 mH (0.1 mH lower) and DCR is 200 mOhm (30 mOhm higher), both values remain within acceptable engineering tolerances for common mode choke applications. The part maintains identical electrical ratings, pin configuration, and physical dimensions.

Parameter Comparison

Engineering Selection Recommendations

The ET2432-024 is the qualified substitute for the obsolete CMF-8033. Selection is based on the following factors:

Product Status: The ET2432-024 maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete CMF-8033.

Electrical Compatibility: Both components operate at identical voltage ratings (250V AC) and current ratings (2A). The inductance variance of 0.1 mH and DCR increase of 30 mOhm are within acceptable tolerances for common mode choke applications in power line filtering.

Mechanical Compatibility: Both parts feature identical package configurations (Vertical, 4 PC Pin) and maximum heights (1.220"), ensuring direct board-level compatibility without layout modifications.

Compliance and Certifications: The ET2432-024 carries CSA, IEC, and UL approvals, providing enhanced regulatory compliance compared to the CMF-8033. The part is ROHS3 compliant and REACH unaffected, meeting current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the ET2432-024 be used as a direct replacement for the CMF-8033 without circuit modifications?

A: Yes. Both components share identical electrical ratings (2A, 250V AC), pin configurations (Vertical, 4 PC Pin), and physical dimensions (1.220" height). The inductance and DCR variations are within acceptable engineering tolerances for common mode choke applications.

Q: What is the significance of the 0.1 mH inductance difference between the two parts?

A: The ET2432-024 specifies 3.2 mH while the CMF-8033 specifies 3.3 mH. This 3% variance is typical within common mode choke manufacturing tolerances and does not affect functional performance in power line filtering applications at the specified current and voltage ratings.

Q: Why is the DCR higher on the ET2432-024 (200 mOhm vs. 170 mOhm)?

A: The 30 mOhm increase represents approximately 18% higher resistance. This results in marginally increased power dissipation but remains acceptable for 2A applications. The ET2432-024 operates within the -20°C to 105°C temperature range, providing thermal margin for this additional dissipation.

Q: Are there any packaging differences between these components?

A: The CMF-8033 is supplied in standard packaging, while the ET2432-024 is supplied in bulk packaging. Both maintain identical component specifications and pin configurations. Bulk packaging does not affect electrical or mechanical compatibility.

Q: What certifications does the ET2432-024 carry?

A: The ET2432-024 is certified by CSA, IEC, and UL, and is ROHS3 compliant. These certifications exceed the documentation provided for the obsolete CMF-8033.

Q: Is the ET2432-024 suitable for applications requiring MSL 1 (Unlimited) moisture sensitivity?

A: The ET2432-024 is listed as "Not Applicable" for MSL, indicating it does not require moisture sensitivity classification. This is typical for through-hole mounted components and does not indicate incompatibility with applications previously using MSL 1 components.