170123K250AA Film Capacitor - Equivalent & Substitute Parts

Part Overview

The 170123K250AA is a 0.012 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) from the 170 series, rated for 250V DC operation. This component is designed for DC link and DC filtering applications, featuring low ESR characteristics and polypropylene metallized dielectric construction. The part is currently obsolete, making identification of suitable substitute components essential for system maintenance, repair, and redesign efforts.

Substiute Parts

170123K250AA

Cornell Dubilier Electronics (CDE)In Stock: 1160170123K250AA Datasheet

Current PartRFQ

WMC2S12K-F

Cornell Dubilier Electronics (CDE)In Stock: 781WMC2S12K-F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 170123K250AA is determined by the following critical parameters:

• Capacitance Value: Must be 0.012 µF (±10% tolerance acceptable)
• Voltage Rating - DC: Minimum 250V DC
• Mounting Type: Through Hole axial configuration required
• Termination: PC Pins for PCB compatibility
• Package / Case: Axial form factor

The substitute part WMC2S12K-F meets these core electrical and mechanical requirements. While the dielectric material differs (polyester versus polypropylene), both materials are film-based and suitable for the specified applications. The substitute maintains the same capacitance, DC voltage rating, tolerance, mounting type, and termination style.

Parameter Comparison

Engineering Selection Recommendations

The WMC2S12K-F is a suitable substitute for the obsolete 170123K250AA based on the following factors:

• Electrical Compatibility: Both components share identical capacitance (0.012 µF), DC voltage rating (250V), and tolerance (±10%), meeting the core electrical requirements for DC link and DC filtering applications.
• Mechanical Compatibility: Both components feature through-hole axial mounting with PC pin termination, ensuring PCB compatibility. Physical dimensions differ slightly; verification of board layout clearance is necessary prior to implementation.
• Regulatory Compliance: The WMC2S12K-F holds ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory standards. The original part requires inventory verification for RoHS status.
• Product Availability: The substitute is active in production with 725 units in stock, whereas the original is obsolete with limited availability.
• Temperature Performance: The substitute operates across a wider temperature range (-55°C ~ 125°C versus -55°C ~ 105°C), providing enhanced thermal margin for extended operating conditions.

Frequently Asked Questions (FAQ)

Q: Can the WMC2S12K-F directly replace the 170123K250AA without circuit modification?

A: The WMC2S12K-F meets all critical electrical parameters (capacitance, DC voltage rating, tolerance) required for substitution. Physical dimensions differ slightly; board layout verification is necessary to confirm clearance compatibility.

Q: What is the difference between polypropylene and polyester dielectric materials in film capacitors?

A: Both polypropylene and polyester are film-based dielectric materials suitable for DC filtering and DC link applications. Polypropylene typically exhibits lower ESR and higher frequency performance, while polyester provides broader temperature operating range and cost efficiency. For the specified DC filtering application, both materials are functionally equivalent.

Q: Does the AC voltage rating difference (200V versus 125V) affect DC circuit performance?

A: AC voltage rating does not impact DC circuit performance. The critical parameter for DC applications is the DC voltage rating, which is identical at 250V for both components. AC rating is relevant only for AC or mixed-signal applications.

Q: Are there any PCB layout considerations when substituting this component?

A: The substitute component has slightly larger physical dimensions (0.228" Dia x 0.469" L versus 0.197" Dia x 0.433" L). Verify that the PCB layout provides adequate clearance around the component mounting location. Lead spacing and termination style remain compatible.

Q: What compliance certifications should I verify before implementation?

A: The WMC2S12K-F is ROHS3 compliant and REACH unaffected. If your application requires specific environmental or regulatory certifications, confirm that the substitute meets those requirements prior to design release.