The Timepix2 pixel can be programmed to operate in one of several modes depending on the application requirement, offering increased complexity compared to the predecessor Timepix ASIC. Readout is frame-based. The arrival time (Time-of-Arrival – ToA) and charge deposit information (Time-over-Threshold – ToT) can be recorded for each hit when used in sequential read/write mode. In continuous read/write mode one can chose between ToT, ToA or event counting. There are a total of 28 bits per pixel which can be allocated depending on the read/write mode chosen and the requirements of the application.

Advantages & Applications


  • Pixel size 55μm x 55μm.
  • 256 x 256 pixels.
  • 28 bits/pixel.
  • Simultaneous ToT and ToA.
  • Separate ToT and ToA clock frequencies.
  • Readout dead-time-free modes.
  • Frame-based sequential or continuous read/write modes.
  • Digital and analogue pixel masking available per pixel (turn off power consumption in unused pixels).
  • Linear front-end gain, possibility to configure for ‘logarithmic’ gain mode only in positive polarity.
  • 3-side buttable.
  • Wire bonding pads can facilitate TSV processing.


  • X-ray imaging
  • Material analysis
  • Particle track reconstruction 
  • Non-destructive testing


CMOS technology


Pixel size

55μm x 55μm

Pixel matrix

256 x 256

Detector polarity

Electron collection

◦ Leakage current compensation optimal (IDET > IKRUM)

◦ Non-monotonicity of the ToT vs Qin

Hole collection

◦ Leakage current limited (IDET < IKRUM/2)

◦ Adaptive gain mode available

Leakage current

Electron collection: Up to 12nA/pixel (non-uniform)

Hole collection 2nA/pixel

Peaking time

~100ns (Adaptive gain OFF)

~200ns (Adaptive gain ON)


61e- rms

Threshold variation

~40e rms after trimming 5-bit adjustment

Minimum operating threshold 


Power consumption

5µA/pixel @1.2V i.e., ~165mW/cm2 (low power mode)

Digital 500mW

Total 900mW

Analogue supply voltage


ToA bin size


Timepix2 ready for licensing.