CM9900-186 Equivalent & Substitute Parts

Part Overview

The CM9900-186 is a 2-line common mode choke (CMC) rated for 18 mH inductance at 1 kHz with a maximum current capacity of 270mA and 2.45Ohm DC resistance. This component is actively manufactured and maintained in production. Common mode chokes of this specification are essential for EMI suppression and signal integrity in power distribution and data transmission applications. Alternative models may be required when different inductance values, resistance characteristics, or compliance certifications are needed for specific circuit applications.

Substiute Parts

CM9900-186

API Delevan Inc.In Stock: 1166CM9900-186 Datasheet

Current PartRFQ

CM9900R-126

API Delevan Inc.In Stock: 1105CM9900R-126 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for common mode chokes is determined by the following critical parameters:

Fixed Parameters (Must Match):

• Number of Lines: 2
• Current Rating (Max): 270mA
• Operating Temperature Range: -55°C to 125°C
• Mounting Type: Through Hole
• Size / Dimension: 0.839" L x 0.740" W (21.30mm x 18.80mm)
• Height (Max): 0.669" (17.00mm)
• Package / Case: Vertical, 4 PC Pin

Variable Parameters (Allow Substitution):

• Inductance @ Frequency: May differ based on circuit filtering requirements
• DC Resistance (DCR): May vary with different inductance specifications
• RoHS Compliance: May differ based on application requirements

The substitute part CM9900R-126 matches all fixed parameters while providing a lower inductance value (12 mH versus 18 mH) and reduced DC resistance (1.98Ohm versus 2.45Ohm).

Parameter Comparison

Engineering Selection Recommendations

Both the CM9900-186 and CM9900R-126 are actively produced components from API Delevan Inc. The CM9900R-126 substitute offers improved compliance status, featuring ROHS3 certification compared to the non-compliant RoHS status of the CM9900-186. Selection between these parts depends on the following criteria:

Select CM9900-186 when:

• Application requires 18 mH inductance at 1 kHz
• RoHS compliance is not a circuit requirement
• Higher inductance values are necessary for EMI suppression

Select CM9900R-126 when:

• Application requires 12 mH inductance at 1 kHz
• ROHS3 compliance is mandated
• Lower DC resistance is preferred to reduce power dissipation
• PCB layout or circuit design accommodates the lower inductance specification

Both parts operate across the identical temperature range (-55°C to 125°C), share identical current ratings (270mA), and maintain the same physical footprint and through-hole mounting configuration.

Frequently Asked Questions (FAQ)

Q: Can the CM9900R-126 directly replace the CM9900-186 in all applications? A: Direct substitution is possible only when the circuit design accommodates the lower inductance value (12 mH versus 18 mH). The reduced inductance will affect the frequency response and filtering characteristics. Verify that the target application does not require the higher inductance specification.

Q: What is the impact of the different DC resistance values between these parts? A: The CM9900R-126 exhibits lower DC resistance (1.98Ohm versus 2.45Ohm). This reduces power dissipation but does not affect substitutability from a mechanical or electrical compatibility standpoint. The resistance difference is a direct consequence of the lower inductance design.

Q: Are both parts physically interchangeable on the PCB? A: Yes. Both parts share identical dimensions (0.839" L x 0.740" W, 21.30mm x 18.80mm), maximum height (0.669" / 17.00mm), through-hole mounting type, and Vertical 4 PC Pin package configuration. They are mechanically and electrically interchangeable in terms of footprint and pinout.

Q: What does ROHS3 compliance mean for the CM9900R-126? A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive requirements. The CM9900-186 is non-compliant with RoHS standards. Selection of the CM9900R-126 is required when RoHS compliance is mandated by application specifications or regulatory requirements.

Q: Do both parts operate across the same temperature range? A: Yes. Both the CM9900-186 and CM9900R-126 operate across the identical temperature range of -55°C to 125°C, ensuring thermal compatibility in equivalent applications.

Q: How do I determine which inductance value is correct for my application? A: Inductance selection depends on the target EMI suppression frequency range and filtering requirements. The 18 mH specification (CM9900-186) provides stronger attenuation at lower frequencies, while the 12 mH specification (CM9900R-126) provides reduced attenuation but lower insertion loss. Review your circuit's EMI filtering specifications to determine the required inductance value.