The document describes the variation of frequency and resistance of a product and provides corresponding values. The product offers multiple options for frequency and resistance, making it suitable for different applications.
The LHi 874 and LHi 878 are pyroelectric infrared‑detector series designed for motion‑control systems. LHi 874 is supplied in a TO‑39 housing, while LHi 878 uses a TO‑5 housing with a standard infrared filter. Both detectors feature a dual‑element pyro‑electric ceramic with a source‑follower FET configuration.
Key specifications include a responsivity of 3300‑4000 V/MV at 100 °C, noise levels of 20‑50 µVpp (0.3‑10 Hz), operating voltage range of 2‑15 V, and output impedance of 10 kΩ. The detectors provide a vertical field of view of 95° and a horizontal field of view of 90°, and they operate reliably from –40 °C to 85 °C with storage temperatures from 0 °C to 85 °C.
| Responsivity | 3300‑4000 V/MV |
|---|---|
| Noise | 20‑50 µVpp (0.3‑10 Hz) |
| Operating Voltage | 2‑15 V |
| Vertical Field of View | 95° |
| Horizontal Field of View | 90° |
| Storage Temperature Range | 0 °C to 85 °C |
The LHi 874 is supplied in a TO‑39 housing, while the LHi 878 is supplied in a TO‑5 housing with a standard infrared filter.
The detectors have a responsivity of 3300 to 4000 V/MV measured at 100 °C and 1 Hz.
They operate from 2 V up to 15 V.