NMOS linear image sensors are self-scanning photodiode arrays designed specifically as detectors for multichannel spectroscopy. The scanning circuit is made up of N-channel MOS transistors, operates at low power consumption and is easy to handle. Each photodiode has a large active area, high UV sensitivity yet very low noise, delivering a high S/N even at low light levels. NMOS linear image sensors also offer excellent output linearity and wide dynamic range. The photodiodes of S3901 series have a height of 2.5 mm and are arrayed in a row at a spacing of 50 µm. The photodiodes of S3904 series also have a height of 2.5 mm but are arrayed at a spacing of 25 µm. The photodiodes are available in 3 different pixel quantities for each series: 128 (S3901-128Q), 256 (S3901-256Q, S3904-256Q), 512 (S3901-512Q, S3904-512Q) and 1024 (S3904-1024Q). Quartz glass is the standard window material.
The S3901 and S3904 series are NMOS linear image sensors designed for multichannel spectroscopy. They feature a self‑scanning photodiode array with high UV sensitivity, low dark current, and excellent linearity, available in various pixel counts and window materials.
The datasheet details mechanical dimensions, electrical parameters such as power consumption (1 mW max), operating temperature range (‑40 °C to +65 °C), and pin functions. It also includes driver circuit options, auxiliary functions like anti‑blooming, and handling precautions for static discharge and window cleaning.
| Pixel pitch | 50 µm (S3901) / 25 µm (S3904) |
|---|---|
| Pixel height | 2.5 mm |
| Number of pixels | 128, 256, 512, 1024 (depending on model) |
| Power consumption | 1 mW max |
| Operating temperature | -40 °C to +65 °C |
| Storage temperature | -40 °C to +85 °C |
| Number of pins | 22 |
| Window material | Quartz glass |
| Photodiode dark current | 0.2–0.6 pA (S3901) / 0.1–0.3 pA (S3904) |
| Saturation output charge | 50 pC (S3901) / 25 pC (S3904) |
| Photo response non‑uniformity (PRNU) | +3 % |
The maximum power consumption is 1 mW.
They operate from –40 °C to +65 °C.
The package has 22 pins.
The window material is quartz glass.