MSD1278H-123MED

Common Mode Chokes Overview

The Coilcraft MSD1278H-123MED is a shielded coupled inductor from the MSD1278H series, designed for high-temperature automotive applications. It features a ferrite core and surface-mount termination style with dimensions of 12.3 mm x 12.3 mm x 8.05 mm. The component offers an inductance of 12 µH per winding (48 µH series) with a 20% tolerance. It supports a maximum DC current of 3.5 A and has a maximum DC resistance of 62 mΩ. The device operates within a temperature range of -40°C to +150°C and complies with AEC-Q200 standards.

Common Mode Chokes Feature Summary

• High-temperature capability up to 150°C for automotive environments
• Shielded magnetic design to minimize electromagnetic interference
• AEC-Q200 qualified for automotive reliability requirements

Common Mode Chokes Applications

• Automotive power supply circuits
• DC-DC converter input/output filtering
• On-board charging systems

Common Mode Chokes Procurement Notes

Verify the suffix MED indicates matte tin over nickel terminations and machine-ready reel packaging. Confirm the specific temperature rating of 150°C aligns with system thermal constraints. Ensure AEC-Q200 compliance is required for the target automotive application. Cross-reference the part number against official Coilcraft documentation to confirm availability and lead times.

Common Mode Chokes Selection Notes

Select this component when high-temperature operation exceeding standard industrial limits is required. The 1:1 turns ratio and shielded construction make it suitable for differential signaling or balanced power lines. Compare saturation current and DC resistance against circuit load requirements. Consider the physical footprint compatibility with PCB layout constraints.

Common Mode Chokes Part Context

This part belongs to the MSD1278H series, which distinguishes itself through enhanced thermal performance compared to standard MSD1278 variants. The H suffix typically denotes high-temperature ratings. It shares the same mechanical envelope as other members in the 1278 family but utilizes materials optimized for elevated operating conditions.

Common Mode Chokes Replacement Considerations

MSD1278T-123MLD is a related variant offering similar electrical characteristics but with a lower maximum operating temperature of 85°C. Verify if the reduced thermal rating meets application needs before substitution.