FLIR Lepton 3.5 is a miniature LWIR (long-wave infrared, 8–14 μm) thermal microcamera from Teledyne FLIR, delivered in a wafer-level package measuring only 11.5 × 12.7 × 5.9 mm. The microbolometer sensor with 160 × 120 pixel resolution captures thermal images with NETD < 50 mK sensitivity and full radiometry — each pixel value corresponds to the absolute temperature of the object (measurement range −10 °C to +400 °C).
A key feature of the Lepton 3.5 is power consumption below 150 mW and an SPI (video) + I²C (control) interface, making it ideal for integration with microcontrollers (STM32, Raspberry Pi) and SBC computers. The lens field of view is 56°, frame rate 8.7 Hz (ITAR-free export) or 9 Hz (US).
In mobile robotics, the Lepton 3.5 is used in inspection quadrupeds (Boston Dynamics Spot, ANYbotics ANYmal) to detect pipeline leaks, hot bearings, fires, and humans in low-visibility conditions. It is also used in autonomous drones for thermal detection.
The camera ships as a socketed BGA-PLCC module for easy servicing. The manufacturer offers FLIR Lepton Breakout boards, GroupGets Lepton Module, and built-in integration in PureThermal 2/3 — greatly simplifying prototyping.
serves as: Sensing, Perception, Computer vision processing.
Which group FLIR Lepton 3.5 belongs to and how it is built
