CMT-03801 Equivalent & Substitute Parts

Part Overview

The CMT-03801 is a 1 mH, 2-line common mode choke manufactured by Tamura, designed for through-hole mounting applications with an 8A maximum current rating and 20mOhm DC resistance. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity. The part operates at 250V AC and features unlimited moisture sensitivity level (MSL 1), suitable for industrial filtering applications requiring common mode noise suppression.

Substiute Parts

CMT-03801

TamuraIn Stock: 668CMT-03801 Datasheet

Current PartRFQ

8108-RC

Bourns Inc.In Stock: 38908108-RC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMT-03801 is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 1 mH @ 1 kHz (exact match required)
• Number of lines: 2-line configuration (exact match required)
• Mounting type: Through hole (exact match required)
• Package configuration: 4 PC pin vertical orientation (exact match required)

Secondary Compatibility Parameters:

• Current rating: Substitute must equal or exceed 8A
• DC resistance: Substitute must equal or be lower than 20mOhm
• Voltage rating: Substitute must support minimum 250V AC operation
• Moisture sensitivity: MSL 1 (unlimited) acceptable

The Bourns 8108-RC meets all primary matching criteria and exceeds secondary parameters, qualifying as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The Bourns 8108-RC is the qualified substitute for the obsolete Tamura CMT-03801 based on the following engineering criteria:

Functional Equivalence: Both components provide identical inductance (1 mH @ 1 kHz) in a 2-line common mode choke configuration with through-hole mounting and 4-pin vertical package orientation.

Performance Enhancement: The 8108-RC provides superior electrical performance with 10A current rating (exceeding the 8A requirement) and 10mOhm DC resistance (50% lower than the 20mOhm specification), resulting in reduced power dissipation and improved thermal characteristics.

Compliance Status: The 8108-RC is an active product with ROHS3 compliance and REACH unaffected status, ensuring long-term availability and regulatory alignment. The CMT-03801 obsolete status necessitates transition to an active equivalent.

Dimensional Compatibility: Physical dimensions are comparable (30.48mm L × 15.24mm W for 8108-RC versus 33.00mm L × 22.00mm W for CMT-03801), with both maintaining vertical 4-pin through-hole configuration suitable for standard PCB layouts.

Thermal Performance: The 8108-RC specifies operating temperature range of -55°C to 105°C, providing defined thermal boundaries for system design validation.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 8108-RC directly replace the Tamura CMT-03801 in existing designs?

A: Yes. Both components share identical inductance (1 mH @ 1 kHz), 2-line configuration, through-hole mounting, and 4-pin vertical package. The 8108-RC exceeds electrical specifications (10A vs. 8A current rating; 10mOhm vs. 20mOhm DCR), ensuring functional compatibility without circuit redesign.

Q: What are the key differences between these two parts?

A: The primary differences are: (1) Manufacturer (Tamura vs. Bourns); (2) Product status (obsolete vs. active); (3) Current rating (8A vs. 10A); (4) DC resistance (20mOhm vs. 10mOhm); (5) Operating temperature specification (-55°C to 105°C for 8108-RC); (6) Compliance certifications (ROHS3 and REACH status for 8108-RC). Electrical performance of the 8108-RC exceeds the CMT-03801 specification.

Q: Are there physical dimension concerns when substituting?

A: Dimensions differ slightly (CMT-03801: 33.00mm L × 22.00mm W; 8108-RC: 30.48mm L × 15.24mm W). Both maintain vertical 4-pin through-hole configuration. PCB layout verification is recommended to confirm clearance compatibility, though the smaller footprint of the 8108-RC typically presents no mounting obstacles.

Q: What is the inventory status for each part?

A: CMT-03801 has 655 pieces in stock (obsolete status). Bourns 8108-RC has 3858 pieces in stock (active product). The 8108-RC provides superior long-term availability due to active product status.

Q: Does the 8108-RC meet the same voltage and moisture sensitivity requirements?

A: The 8108-RC voltage rating is not specified in available data. Both components share MSL 1 (unlimited) moisture sensitivity rating. For applications requiring 250V AC operation, voltage rating confirmation for the 8108-RC is necessary through Bourns technical documentation.

Q: What compliance certifications apply to the 8108-RC?

A: The Bourns 8108-RC is ROHS3 compliant and REACH unaffected. ECCN classification is EAR99 for both components. The CMT-03801 compliance certifications are not specified in available data.