ELF-11M040E Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-11M040E is a 2-line common mode choke (CMC) designed for through-hole mounting with a 400mA current rating and 1.35Ohm typical DC resistance. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The through-hole configuration and compact vertical mounting profile serve applications requiring EMI filtering in power distribution and signal integrity circuits.

Substiute Parts

ELF-11M040E

Panasonic Electronic ComponentsIn Stock: 1073ELF-11M040E Datasheet

Current PartRFQ

B82730U3401A020

EPCOS - TDK ElectronicsIn Stock: 2963B82730U3401A020 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELF-11M040E is determined by the following critical parameters:

• Number of Lines: Must remain 2-line configuration for common mode filtering function
• Current Rating: Substitute must support minimum 400mA continuous current
• Mounting Type: Through-hole vertical mounting required for PCB compatibility
• Package Configuration: Vertical 4-pin package maintains footprint and lead spacing
• Physical Dimensions: Substitute dimensions must be compatible with existing PCB layouts (approximately 16-17mm length, 10.5-11mm width, 16.5-17mm height)
• DC Resistance: Substitute DCR should be within acceptable range for the application circuit

The B82730U3401A020 qualifies as a substitute based on matching these core parameters while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The B82730U3401A020 is the designated substitute for the obsolete ELF-11M040E based on the following engineering criteria:

Product Status: The B82730U3401A020 maintains active product status with full manufacturer support, ensuring long-term availability and supply chain stability compared to the obsolete ELF-11M040E.

Compliance & Certifications: The B82730U3401A020 is ROHS3 compliant and carries UR and VDE approvals, providing regulatory compliance for modern applications. The ELF-11M040E is RoHS non-compliant, limiting its use in regulated markets.

Electrical Compatibility: Both components share identical 2-line configuration, 400mA current rating, and through-hole mounting. The B82730U3401A020 specifies 300V AC voltage rating and -40°C to 125°C operating temperature range, providing defined performance boundaries absent in the ELF-11M040E specification.

Physical Compatibility: Dimensional differences are minimal (0.02" length, 0.02" width variance). The B82730U3401A020 height is 0.019" lower, improving PCB layout flexibility. Both maintain vertical 4-pin package configuration for direct footprint compatibility.

DC Resistance Consideration: The B82730U3401A020 exhibits 2.4Ohm typical DCR compared to 1.35Ohm for the ELF-11M040E. Circuit thermal and power dissipation analysis is required to confirm acceptability within the application's design margins.

Frequently Asked Questions (FAQ)

Q: Can the B82730U3401A020 directly replace the ELF-11M040E without PCB modification?

A: Physical footprint compatibility is maintained due to matching vertical 4-pin through-hole package configuration. Dimensional variance (approximately 0.02" in length and width) is within typical PCB tolerance. However, circuit-level validation is required to confirm the 2.4Ohm DCR of the substitute is acceptable for your application's thermal and power dissipation requirements.

Q: What is the primary reason for substitution?

A: The ELF-11M040E is obsolete with no active manufacturer support. The B82730U3401A020 is an active product with established supply chain availability, regulatory compliance (ROHS3, UR, VDE), and defined operating specifications.

Q: Are there any electrical performance differences?

A: Both components maintain 2-line configuration and 400mA current rating. The B82730U3401A020 specifies 15mH inductance at 10kHz, 300V AC voltage rating, and -40°C to 125°C operating temperature. The ELF-11M040E lacks these detailed specifications. The DCR difference (2.4Ohm vs 1.35Ohm) must be evaluated within your circuit design.

Q: Is the B82730U3401A020 suitable for new designs?

A: Yes. Active product status, ROHS3 compliance, and third-party certifications (UR, VDE) make the B82730U3401A020 appropriate for new product development and production environments requiring regulatory compliance.

Q: What packaging is available for the B82730U3401A020?

A: The B82730U3401A020 is supplied in tray packaging, suitable for automated assembly processes. The ELF-11M040E packaging format is not specified in available data.