Segmented Photodiodes

Dual Cell & Quadrant Photodiodes

The SPOT Series are common substrate photodetectors segmented into either two (2) or four (4) separate active areas. They are available with either a 0.005" or 0.004" well defined gap between the adjacent elements resulting in high response uniformity between the elements. The SPOT series are ideal for very accurate nulling or centering applications. Position information can be obtained when the light spot diameter is larger than the spacing between the cells.

Spectral response range is from 350 - 100 nm. Notch or bandpass filters can be added to achieve specific spectral responses. These detectors exhibit excellent stability over time and temperature, fast response times necessary for high speed or pulse operation, and position resolutions of better than 0.1 µm. Maximum recommended power density is 10 mW / cm2 and typical uniformity of response for a 1 mm diameter spot is ±2%. The circuit on the opposite page represents a typical biasing and detection circuit set up for both bi-cells and quad-cells. For position calculations and further details, refer to "Photodiode Characteristics" section of the catalog.

Silicon Segmented Photodiode

Product Applications

  • Pulse Detectors
  • Optical Communications
  • Bar Code Readers
  • Optical Remote Control
  • Medical Equipment
  • High Speed Photometry

Product Features

  • High Speed Response
  • Low Capacitance
  • Low Dark Current
  • Wide Dynamic Range
  • High Responsivity

Dual Cell Photodiodes

Model Number Active Area Active Area Dimensions Element Gap Responsivity Shunt Resistance Dark Current Capacitance Rise Time Package Click Image to Zoom
CD-25T 2.3 mm² 4.6 x 0.5 mm 0.2 mm 0.65 A/W --- 20 nA @-15V 50 pF @-15V 300 ns @-15V 2 / TO-5 Click to View Larger Image of (CD-25T)
SPOT-2DMI 0.7 mm² 0.6 x 1.2 mm 0.013 mm 0.65 A/W --- 0.05 nA 3 pF 11 ns 40 / TO-18 Click to View Larger Image of (SPOT-2DMI)
SPOT-2D 3.3 mm² 1.3 x 2.5 mm 0.127 mm 0.65 A/W --- 0.15 nA 11 pF 22 ns 41 / TO-5 Click to View Larger Image of (SPOT-2D)
SPOT-3D 2.8 mm² 0.6 x 4.6 mm 0.025 mm 0.65 A/W --- 0.13 nA 7 pF 25 ns 41 / TO-5 Click to View Larger Image of (SPOT-3D)

Quadrant Photodiodes

Model Number Active Area Active Area Dimensions Element Gap Responsivity Dark Current Capacitance Rise Time Package Click Image to Zoom
SPOT-4D 1.61 mm² 1.3 mm² 0.127 mm 0.65 A/W 1 nA 5 pF 22 ns 41 / TO-5 Click to View Larger Image of (SPOT-4D)
SPOT-4DMI 0.25 mm² 0.5 mm² 0.013 mm 0.65 A/W 0.01 nA 1 pF 9 ns 41 / TO-5 Click to View Larger Image of (SPOT-4DMI)
SPOT-9D 19.6 mm² 10 Φ mm ‡ 0.102 mm 0.65 A/W .5 nA 60 pF 28 ns 43 / Lo-Prof Click to View Larger Image of (SPOT-9D)
SPOT-9DMI 19.6 mm² 10 Φ mm ‡ 0.01 mm 0.65 A/W 10 nA 60 pF 28 ns 43 / Lo-Prof Click to View Larger Image of (SPOT-9DMI)
‡ Overall Diameter (All four Quads).
Chip centering within ± 0.010".