CMF-0056 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The CMF-0056 is a 2-line common mode choke manufactured by Tamura, rated for 5.6 mH inductance at 1 kHz with a maximum current capacity of 550 mA and DC resistance of 840 mOhm. This component is designed for electromagnetic interference (EMI) suppression in power line applications. The CMF-0056 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

CMF-0056

TamuraIn Stock: 1079CMF-0056 Datasheet

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ALFT-03A-8

Abracon LLCIn Stock: 1237ALFT-03A-8 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CMF-0056 are identified based on strict electrical and mechanical parameter alignment within the common mode choke product category. The substitution logic is governed by the following criteria:

Electrical Compatibility:

• Inductance value must be within ±10% of the original specification (5.6 mH ± 0.56 mH acceptable range: 5.04–6.16 mH)
• Number of lines must equal 2 (dual-line configuration required)
• Current rating must equal or exceed 550 mA to ensure thermal margin
• DC resistance should not significantly exceed the original 840 mOhm to minimize insertion loss
• Voltage rating must meet or exceed 250 V AC

Mechanical Compatibility:

• Package configuration must be Vertical, 4 PC Pin
• Physical dimensions must accommodate the original PCB footprint or allow minor layout adjustment
• Moisture sensitivity level must be compatible with assembly and storage processes

Product Status Consideration:

• Active product status is preferred for long-term availability and supply chain stability
• Obsolete parts may be used only when no active alternatives exist

The ALFT-03A-8 manufactured by Abracon LLC meets all substitution criteria and is classified as an active product.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: ALFT-03A-8 (Abracon LLC)

The ALFT-03A-8 is the qualified substitute for the obsolete CMF-0056. Selection is based on the following engineering factors:

1. Electrical Performance: The ALFT-03A-8 delivers 5.5 mH inductance at 1 kHz, representing a −1.8% deviation from the original 5.6 mH specification. This variance is within standard engineering tolerance for common mode choke applications. The substitute's current rating of 1 A exceeds the original 550 mA requirement, providing additional thermal margin. DC resistance of 750 mOhm is 10.7% lower than the original 840 mOhm, resulting in reduced insertion loss and improved efficiency.

2. Product Status and Supply Chain: The CMF-0056 is classified as obsolete, creating procurement risk. The ALFT-03A-8 is an active product with confirmed inventory of 1175 pieces, ensuring long-term availability and supply stability.

3. Compliance and Certifications: The ALFT-03A-8 is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original CMF-0056 compliance status is not specified in available documentation.

4. Physical Compatibility: Both components feature vertical, 4-pin configurations with identical pin spacing. The ALFT-03A-8 dimensions (23.90 × 18.00 × 21.60 mm) are larger than the CMF-0056 (17.50 × 16.00 × 20.50 mm). PCB layout verification is required to confirm clearance around the substitute component.

5. Operating Environment: The ALFT-03A-8 specifies an operating temperature range of −25°C to 85°C, providing defined thermal performance boundaries. The original CMF-0056 operating temperature is not specified.

Implementation Consideration: Direct pin-for-pin substitution is electrically and mechanically feasible. PCB layout review is mandatory to accommodate the larger physical footprint of the ALFT-03A-8.

Frequently Asked Questions (FAQ)

Q1: Can the ALFT-03A-8 be used as a direct replacement for the CMF-0056 without circuit modification?

A: Yes, the ALFT-03A-8 is electrically compatible as a direct substitute. Both components are 2-line common mode chokes with identical 4-pin vertical configurations. The ALFT-03A-8 inductance of 5.5 mH is within acceptable tolerance of the original 5.6 mH specification (−1.8% deviation). Current rating and DC resistance of the substitute meet or exceed original requirements. However, PCB layout verification is required due to the larger physical dimensions of the ALFT-03A-8 (23.90 × 18.00 × 21.60 mm versus 17.50 × 16.00 × 20.50 mm).

Q2: What is the significance of the lower DC resistance in the ALFT-03A-8?

A: The ALFT-03A-8 DC resistance of 750 mOhm is 10.7% lower than the original CMF-0056 specification of 840 mOhm. Lower DC resistance reduces power dissipation and insertion loss in the circuit, resulting in improved efficiency and reduced heat generation. This represents a performance improvement over the original component.

Q3: Why is the current rating of the ALFT-03A-8 (1 A) higher than the CMF-0056 (550 mA)?

A: The higher current rating of the ALFT-03A-8 indicates a larger core cross-section and improved thermal design. This provides additional margin for transient current conditions and thermal cycling. The substitute can safely handle the original 550 mA requirement with reduced thermal stress.

Q4: Are there any compliance or certification differences between the two components?

A: The ALFT-03A-8 is ROHS3 compliant and REACH unaffected, meeting current environmental regulations. The CMF-0056 compliance status is not documented in available specifications. For applications requiring specific regulatory certifications, the ALFT-03A-8 provides documented compliance with modern standards.

Q5: What PCB layout considerations apply when substituting the ALFT-03A-8 for the CMF-0056?

A: The ALFT-03A-8 is 6.4 mm longer (23.90 mm versus 17.50 mm) and 2.0 mm wider (18.00 mm versus 16.00 mm) than the original CMF-0056. PCB layout must be reviewed to confirm adequate clearance around the substitute component. Pin spacing remains identical, allowing footprint reuse if clearance permits. If space constraints exist, alternative layout routing may be required.

Q6: Is the ALFT-03A-8 available in the same packaging as the CMF-0056?

A: Both components use Vertical, 4 PC Pin package configurations. The CMF-0056 is supplied in standard packaging (MSL 1, Unlimited). The ALFT-03A-8 is supplied in Tray packaging with identical MSL 1 rating. Packaging format does not affect electrical or mechanical compatibility.

Q7: What is the operating temperature range for the ALFT-03A-8?

A: The ALFT-03A-8 operates across −25°C to 85°C. This range covers standard industrial and commercial applications. The original CMF-0056 operating temperature specification is not provided in available documentation. For applications requiring extended temperature operation, the ALFT-03A-8 specification should be verified against system requirements.