CMF-0033 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The CMF-0033 is a 3.3 mH common mode choke manufactured by Tamura, designed for two-line filtering applications in through-hole configurations. This component operates at 800mA maximum current with a DC resistance of 440mOhm and is rated for 250V AC operation. The CMF-0033 is classified as obsolete, making identification of functionally equivalent substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

CMF-0033

TamuraIn Stock: 1089CMF-0033 Datasheet

Current PartRFQ

UU10LFNP-B332

Sumida America Components Inc.In Stock: 971UU10LFNP-B332 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CMF-0033 are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Inductance value: 3.3 mH @ 1 kHz
• Number of lines: 2-line configuration
• Mounting type: Through hole
• Package configuration: Vertical, 4 PC pin

Secondary Compatibility Factors:

• Current rating capability
• DC resistance characteristics
• Physical dimensions and height
• Moisture sensitivity level

The UU10LFNP-B332 from Sumida America Components Inc. meets the primary matching criteria with identical inductance and line configuration. However, substitution requires evaluation of current rating and DC resistance differences, as these parameters directly affect circuit performance and thermal characteristics.

Parameter Comparison

Engineering Selection Recommendations

CMF-0033 (Tamura) - Original Part: The CMF-0033 is obsolete and no longer in active production. Current inventory of 1032 pieces is available as new original stock. This part should be selected only when existing designs require the original component specification or when inventory depletion necessitates component qualification.

UU10LFNP-B332 (Sumida America Components Inc.) - Active Substitute: The UU10LFNP-B332 is an active product with 937 pieces in stock and ROHS3 compliance certification. This part matches the CMF-0033 in inductance value, line configuration, and mounting type. The UU10LFNP-B332 is suitable for new designs and ongoing production where the following conditions are met:

• Circuit current requirements do not exceed 650mA maximum rating
• Higher DC resistance (710mOhm vs. 440mOhm) is acceptable for the application
• Physical dimensions (0.728" L x 0.669" W x 0.906" H) fit within available PCB space
• AC voltage rating specification is not a critical design constraint

Frequently Asked Questions (FAQ)

Q: Can the UU10LFNP-B332 directly replace the CMF-0033 in existing designs?

A: Direct replacement is possible only if circuit current does not exceed 650mA. The UU10LFNP-B332 has a lower current rating (650mA vs. 800mA) and higher DC resistance (710mOhm vs. 440mOhm). Verify that your application operates within these limits before substitution.

Q: What is the impact of the higher DC resistance in the UU10LFNP-B332?

A: The UU10LFNP-B332 has 270mOhm higher DC resistance than the CMF-0033. This increases power dissipation and heat generation proportionally to the square of the operating current. Calculate thermal effects for your specific current profile.

Q: Are the physical dimensions compatible?

A: The UU10LFNP-B332 is slightly larger in all dimensions: 0.039" longer, 0.039" wider, and 0.099" taller than the CMF-0033. Verify PCB layout and clearance before substitution.

Q: What is the significance of ROHS3 compliance on the UU10LFNP-B332?

A: ROHS3 compliance indicates the UU10LFNP-B332 meets current environmental and material restriction standards. This is relevant for applications subject to regulatory compliance requirements or customer specifications.

Q: Why is the CMF-0033 obsolete?

A: The CMF-0033 is classified as obsolete by the manufacturer. The UU10LFNP-B332 represents an active alternative for new designs and ongoing production support.

Q: Can I use the CMF-0033 if my circuit requires 800mA operation?

A: The CMF-0033 is rated for 800mA maximum current. The UU10LFNP-B332 is rated for 650mA maximum. If your application requires 800mA operation, the CMF-0033 must be retained or alternative parts with 800mA or higher ratings must be identified.