1812Y5000393MSTE03

Overview

The Knowles Syfer 1812Y5000393MSTE03 is a multilayer ceramic capacitor (MLCC) featuring a 39 nF capacitance with a ±20% tolerance. It operates at a DC voltage rating of 500 VDC and utilizes an X7R dielectric material. The component is housed in an 1812 (4532 metric) surface-mount package. It belongs to the FlexiCap series, which incorporates flexible terminations to enhance reliability under mechanical stress. The device is rated for operation between -55°C and +125°C and holds AEC-Q200 qualification.

Feature Summary

• Features FlexiCap technology with soft, flexible terminations designed to reduce termination cracking during board flexing.
• Incorporates a nickel barrier structure within the electrode system to improve solderability and long-term stability.
• Constructed as an X2Y capacitor configuration, providing integrated common-mode noise suppression capabilities.

Applications

• Automotive electronics requiring AEC-Q200 qualified components
• Circuit boards susceptible to mechanical flexing or vibration
• High-voltage signal filtering applications

Procurement Notes

Verify the specific suffix MSTE03 against official datasheets to confirm the presence of the nickel barrier and X2Y topology, as standard variants may differ. Ensure compatibility with automated pick-and-place equipment regarding the 1812 footprint dimensions. Confirm RoHS compliance status through current manufacturer documentation before finalizing procurement specifications.

Selection Notes

Select this component when high voltage handling and mechanical robustness are critical. The X7R dielectric offers stable capacitance over temperature, while the flexible terminations address reliability concerns in dynamic environments. Consider the X2Y functionality if space-constrained noise suppression is required alongside standard decoupling duties.

Part Context

This part belongs to the Knowles Syfer FlexiCap family, specialized for high-reliability applications. The 1812Y series denotes a 500V rating class within the 1812 package size. The MSTE03 suffix specifically identifies the variant with nickel barriers and X2Y architecture, distinguishing it from standard single-capacitor MLCCs in the same physical envelope.

Replacement Considerations

Direct substitutes must match the 1812 footprint, 500V rating, and 39nF value. Verify that alternative parts support the required X2Y functionality and flexible termination characteristics if board flex resistance is a design constraint. Cross-reference AEC-Q200 certification requirements for automotive replacements.

FAQ

What is the significance of the X2Y designation in this capacitor?

The X2Y designation indicates a three-terminal device that functions as both a differential-mode and common-mode filter, offering superior noise suppression compared to standard two-terminal capacitors.

How does the FlexiCap technology benefit circuit reliability?

FlexiCap uses flexible terminations that absorb mechanical stress from PCB bending or thermal cycling, significantly reducing the risk of termination cracking and open circuits.