The SiTek Standard PSD (Position Sensing Detector) has high resolution, fast response and outstanding linearity. It is used in a wide variety of applications, most of them utilizing light sources in the visible or near-infrared part of the spectrum. The spectral range covers the region 400 – 1100 nm. Thanks to SiTek’s proprietary AR-coating, optimized around 860 nm, a reflection loss of only 2% is achieved around the responsivity peak. Most of the detectors have a cover window to avoid handling damages.
Position Sensing Detectors (PSD)
The PSD (Position Sensing Detector) is an opto-electronic device which converts
an incident light spot into continuous position data. It provides outstanding
resolution, fast response, excellent linearity for a wide range of light
intensities and also simple operating circuits.
There are two main types of PSDs available:
one-dimensional and
two-dimensional.
Key Features
- Converts the position of a light or radiation spot into signal currents
- Outstanding position resolution and linearity
- Wide range of spectral response
- Works with a wide range of light or radiation intensities
- Short response time
- Measures light or radiation intensity and position simultaneously
- Independent of light or radiation spot focus
- High dynamic range
Quick reference data
| Position non-linearity |
+/-0.1% |
| Detector resistance |
50 kohm |
| Part. No |
Description |
Active area (mm) |
Leakage current (nA) |
Noise current pA/Hz |
Capacitance (pF) |
Rise time (10-90%) (µs) |
Standard package |
| S1 – 0001 | 1L2.5_CP2 | 2,5×0,6 | 2 | 0,4 | 1,6 | 0,03 | 14-pin DIL |
| S1 – 0065 | 1L2.5_CP1 | 2,5×0,6 | 2 | 0,4 | 1,6 | 0,03 | 4-pin DIL |
| S1 – 0003 | 1L5_CP2 | 5,0×1,0 | 4 | 0,4 | 5 | 0,05 | 14-pin DIL |
| S1 – 0009 | 1L5_CP1 | 5,0×1,0 | 4 | 0,4 | 5 | 0,05 | 4-pin DIL |
| S1 – 0005 | 1L10_CP2 | 10×2 | 8 | 0,4 | 15 | 0,2 | 14-pin DIL |
| S1 – 0236 | 1L10_SU70 | 10×2 | 8 | 0,4 | 15 | 0,2 | SMD |
| S1 – 0006 | 1L20_CP3 | 20×3 | 60 | 0,5 | 45 | 0,5 | 22-pin DIL |
| S1 – 0007 | 1L30_SU2 | 30×4 | 150 | 0,7 | 90 | 1 | Substrate |
| S1 – 0247 | 1L45_SU69 | 45×3 | 110 | 0,4 | 105 | 2,7 | Substrate |
| S1 – 0248 | 1L60_SU34 | 60×3 | 150 | 0,4 | 135 | 4,5 | Substrate |
PSD with stray-light elimination
| Position non-linearity |
+/-0.1% |
| Detector resistance |
200 kohm |
| Part. No |
Description |
Active area (mm) |
Leakage current (nA) |
Noise current pA/Hz |
Capacitance (pF) |
Rise time (10-90%) (µs) |
Standard package |
| S1 – 0090 | 1L5NT_CP1 | 5×0,25 | 4 | 0,3 | 5 | 0,25 | 4-pin DIL |
| S1 – 0066 | 1L5NT_CP2 | 5×0,25 | 4 | 0,3 | 5 | 0,25 | 14-pin DIL |
| S1 – 0067 | 1L10NT_CP2 | 10×0,5 | 8 | 0,3 | 15 | 0,7 | 14-pin DIL |
PSD with Enhanced UV respons
| Part. No |
Description |
Active area (mm) |
Leakage current (nA) |
Noise current pA/Hz |
Capacitance (pF) |
Rise time (10-90%) (µs) |
Standard package |
| S1 – 0072 | 1L2,5UV_CP2 | 2,5×0,6 | 2 | 0,4 | 1,6 | 0,03 | 14-pin DIL |
| S1 – 0032 | 1L5UV_CP2 | 5×1 | 4 | 0,4 | 5 | 0,05 | 14-pin DIL |
| S1 – 0073 | 1L10UV_CP2 | 10×2 | 8 | 0,4 | 15 | 0,2 | 14-pin DIL |
| S1 – 0074 | 1L20UV_CP3 | 20×3 | 50 | 0,5 | 45 | 0,5 | 14-pin DIL |
| S1 – 0034 | 1L30UV_SU2 | 30×4 | 150 | 0,5 | 90 | 1 | Substrate |
Common data for all SiTek PSDs
| Thermal drift, typical |
20 ppm/°C for 1L-series and 40 ppm/°C for 2L-series |
| Bias voltage |
5 – 20 V |
| Maximum operating temp. |
70° C |
| Maximum storage temp. |
100° C |
Application Areas
Application areas using SiTek PSD include non-contact distance measurement
systems based on triangulation, alignment and surface level measurement,
position and motion measurement, optical spectrum analysis, three-dimensional
machine vision for contour mapping, and angle measurement systems.
Custom Solutions
Need a solution tailored to your project? We can make it happen.
Our R&D engineers can customize our technology to meet your specific
requirements. Simply complete the contact form, and a member of our team will
be in touch shortly.
