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X2Y® filter capacitors employ a unique, patented low inductance design featuring two balanced capacitors that are immune to temperature, voltage and aging performance differences.These components offer superior decoupling and EMI filtering performance, virtually eliminate parasitics, and can replace multiple capacitors and inductors saving board space and reducing assembly costs.

X2Y PDF Download


X2Y SPICE Download

X2Y SPICE model

X2Y Capacitor


  • One device for EMI suppression or decoupling
  • Replace up to 7 components with one X2Y
  • Differential and common mode attenuation
  • Matched capacitance line to ground, both lines
  • Low inductance due to cancellation effect


  • Amplifier FIlter & Decoupling
  • High Speed Data Filtering
  • EMC I/O Filtering
  • FPGA / ASIC / µ-P Decoupling
  • DDR Memory Decoupling

Common Traits with Conventional MLCC

  • Same component sizes (0603, 0805, 1206, etc.)
  • Same pick and place equipment
  • Same voltage ratings
  • Same dielectric, electrode and termination materials
  • Same industry test standards for component reliability
X2Y® components share many common traits with conventional multi-layer ceramic capacitors (MLCC) to facilitate adoption by end-users into their manufacturing processes.

The X2Y® Design - A Balanced, Low ESL, "Capacitor Circuit"

The X2Y® capacitor design starts with standard 2 terminal MLC capacitor’s opposing electrode sets, A & B, and adds a third electrode set (G) which surround each A & B electrode. The result is a highly vesatile three node capacitive circuit containing two tightly matched, low inductance capacitors in a compact, four-terminal SMT chip.

The X2Y Design - A Balanced, Low ESL, Capacitor Circuit

X2Y Circuit 1: Filtering

EMI Filtering:

The X2Y® component contains two shunt or “line-to-ground” Y capacitors. Ultra-low ESL (equivalent series inductance) and tightly matched inductance of these capacitors provides unequaled high frequency Common-Mode noise filtering with low noise mode conversion. X2Y® components reduce EMI emissions far better than unbalanced discrete shunt capacitors or series inductive filters. Differential signal loss is determined by the cut off frequency of the single line-to-ground (Y) capacitor value of an X2Y®.

X2Y Circuit 2: Power Bypass / Decoupling

Power Bypass / Decoupling

For Power Bypass applications, X2Ys® two “Y” capacitors are connected in parallel. This doubles the total capacitance and reduces their mounted inductance by 80% or 1/5th the mounted inductance of similar sized MLC capacitors enabling high-performance bypass networks with far fewer components and vias. Low ESL delivers improved High Frequency performance into the GHz range.

GSM RFI Attenuation in Audio & Analog

GSM handsets transmit in the 850 and 1850 MHz bands using a TDMA pulse rate of 217Hz. These signals cause the GSM buzz heard in a wide range of audio products from headphones to concert hall PA systems or “silent” signal errors created in medical, industrial process control, and security applications. Testing was conducted where an 840MHz GSM handset signal was delivered to the inputs of three different amplifier test circuit configurations shown below whose outputs were measured on a HF spectrum analyzer.

  • No input filter, 2 discrete MLC 100nF power bypass caps.
  • 2 discrete MLC 1nF input filter, 2 discrete MLC 100nF power bypass caps.
  • A single X2Y 1nF input filter, a single X2Y 100nF power bypass cap.
X2Y configuration provided a nearly flat response above the ambient and up to 10 dB imrpoved rejection than the conventional MLCC configuration.

GSM RFI Attenuation in Audio and Analog


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