EXC-24CD121U Common Mode Choke Equivalent & Substitute Parts

Part Overview

The EXC-24CD121U is a 2-line common mode choke manufactured by Panasonic Electronic Components, designed for signal line filtering applications. This surface mount component provides 120 ohms impedance at 100 MHz with a maximum current rating of 140mA and 2 ohm DC resistance. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

EXC-24CD121U

Panasonic Electronic ComponentsIn Stock: 1108EXC-24CD121U Datasheet

Current PartRFQ

EXC-24CE121U

Panasonic Electronic ComponentsIn Stock: 6657EXC-24CE121U Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the EXC-24CD121U is determined by strict equivalence across the following critical parameters:

• Number of Lines: Must be 2-line configuration
• Filter Type: Must be Signal Line
• Impedance @ Frequency: Must be 120 Ohms @ 100 MHz
• Current Rating (Max): Must be 140mA or greater
• DC Resistance (Max): Must not exceed 2.2 Ohm
• Voltage Rating - DC: Must be 5V or greater
• Mounting Type: Must be Surface Mount
• Package / Case: Must be 0504 (1210 Metric), 4 Lead
• Size / Dimension: Must be 0.049" L x 0.039" W (1.25mm x 1.00mm)
• Height (Max): Must not exceed 0.024" (0.60mm)
• Moisture Sensitivity Level (MSL): Must be 1 (Unlimited)

The EXC-24CE121U meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

The EXC-24CE121U is the direct substitute for the obsolete EXC-24CD121U. Both components are manufactured by Panasonic Electronic Components within the EXC24 series and share identical electrical and mechanical specifications with the exception of DC resistance tolerance (2 Ohm versus 2.2 Ohm maximum) and product status.

The EXC-24CE121U is currently in active production status with significantly higher inventory availability (6586 pcs versus 1025 pcs). The substitute part carries ROHS3 compliance and REACH unaffected status, providing regulatory alignment for current manufacturing standards. The DC resistance differential of 0.2 Ohm remains within acceptable tolerance for signal line filtering applications at the specified 140mA current rating and 5V DC operating voltage.

Frequently Asked Questions (FAQ)

Q: Can the EXC-24CE121U directly replace the EXC-24CD121U in existing designs?

A: Yes. Both components share identical electrical performance at 120 Ohms @ 100 MHz, 140mA current rating, and 5V DC voltage rating. The DC resistance difference (2 Ohm versus 2.2 Ohm maximum) is within acceptable tolerance for signal line filtering applications. Mechanical compatibility is confirmed: identical 0504 (1210 Metric) package, 4-lead configuration, and 0.049" x 0.039" x 0.024" dimensions.

Q: What is the significance of the DC resistance difference between these parts?

A: The EXC-24CD121U specifies 2 Ohm maximum DC resistance, while the EXC-24CE121U specifies 2.2 Ohm maximum. This 0.2 Ohm difference represents a 10% tolerance variance and does not affect functional performance in signal line filtering at the rated 140mA current level.

Q: Why is the EXC-24CD121U listed as obsolete?

A: Product obsolescence is determined by manufacturer discontinuation. The EXC-24CE121U remains in active production and provides equivalent functionality, making it the appropriate replacement for ongoing design support and production requirements.

Q: Are there packaging differences between these parts?

A: The EXC-24CD121U is supplied in standard packaging, while the EXC-24CE121U is supplied in Tape & Reel (TR) format. Both maintain identical component specifications and mechanical dimensions. Tape & Reel packaging is standard for high-volume surface mount assembly operations.

Q: What compliance certifications apply to the substitute part?

A: The EXC-24CE121U carries ROHS3 compliance and REACH unaffected status. Both components share MSL 1 (Unlimited) moisture sensitivity rating and EAR99 export classification.