FLIR
FLIR Lepton 3.5
FLIR Lepton 3.5
Teledyne FLIR’s radiometric LWIR thermal camera module: 160x120 resolution, 57° field of view, integrated shutter, and calibrated temperature for every pixel. Smaller than a dime, NDAA compliant and ITAR free.
SKU: SKU:500-0771-01
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Lepton 3.5 is Teledyne FLIR's radiometric longwave infrared (LWIR) camera module. It fits a 160x120 sensor, a 57° lens and an integrated shutter into a package smaller than a dime, and it outputs calibrated temperature data for every pixel. It's NDAA compliant, ITAR free, and the most widely produced LWIR camera module in the world.
Lepton is a bare camera module. To use it, plug it into a carrier board like the PureThermal 3 or tCam-Mini. See Development Hardware below for more options.
Key Features
- Radiometric: calibrated temperature for every pixel (TLinear) plus a built-in spot meter
- 160x120 resolution, 12 µm pixels, 57° horizontal field of view
- Integrated shutter for automatic flat field correction
- Thermal sensitivity under 50 mK
- Low power: about 150 mW operating, 5 mW standby
- Simple interfaces: video over SPI (VoSPI) and I2C-like control (CCI) through a standard 32-pin socket
- Export-friendly 8.7 Hz frame rate
- NDAA compliant and ITAR free
Specifications
| Part number | 500-0771-01 |
|---|---|
| Sensor | Uncooled VOx microbolometer |
| Spectral band | Longwave infrared, 8 to 14 µm |
| Resolution | 160 x 120, progressive scan |
| Pixel pitch | 12 µm |
| Field of view | 57° horizontal, 71° diagonal |
| Lens | f/1.1, fixed focus |
| Frame rate | 8.7 Hz |
| Thermal sensitivity (NETD) | <50 mK (0.050 °C) |
| Radiometric accuracy | High gain: greater of ±5 °C or 5% (typical) Low gain: greater of ±10 °C or 10% (typical) |
| Scene dynamic range | High gain: -10 °C to 140 °C Low gain: -10 °C to 400 °C |
| Shutter | Integrated |
| Output format | 14-bit, 8-bit (AGC applied), or 24-bit RGB (AGC and colorization applied) |
| Video interface | Video over SPI (VoSPI) |
| Control interface | CCI (I2C-like) |
| Input clock | 25 MHz nominal |
| Supply voltage | 2.8 V, 1.2 V, and 2.5 V to 3.1 V IO |
| Power (typical) | 150 mW operating, 650 mW during shutter event, 5 mW standby |
| Time to image | <1.2 seconds |
| Dimensions (W x L x H) | 11.5 x 12.7 x 6.9 mm without socket 11.8 x 12.7 x 7.2 mm with socket |
| Weight | 0.9 g without socket |
| Socket | 32-pin, compatible with Molex 1050281001 |
| Operating temperature | -10 °C to 80 °C |
| Storage temperature | -40 °C to 80 °C |
| Shock | 1500 G at 0.4 ms |
| Solar protection | Integrated |
Specifications from the Teledyne FLIR Lepton Series Datasheet (December 2025) and subject to change.
Development Hardware
PureThermal boards by GroupGets
- PureThermal 3: USB thermal webcam board
- PureThermal 2 Shielded
- PureThermal Mini USB
- PureThermal Mini Pro JST-SR
- PureThermal Breakout Board
- PureThermal Micro Breakout Board
Partner boards
- tCam-Mini rev4 Wi-Fi streaming camera board by Dan Julio, with onboard antenna or external antenna
- DroneThermal v4: micro UAV thermal camera board
- OpenMV FLIR Lepton Adapter Module for OpenMV cameras
Accessories
Software
- PureThermal firmware
- FLIR Lepton SDK for PureThermal on Windows 10
- Lepton Google Group for community help
Documentation
Datasheets and guides
- Lepton Series Datasheet (December 2025)
- Lepton Engineering Datasheet, Rev 400
- Lepton Software Interface Description Document (IDD), Rev 303
- Lepton with Radiometry Quick Start Guide
- Getting Started with Lepton on Windows and PureThermal Basic Features
- Advanced Lepton Usage on Windows
- Getting Started with the BeagleBone and Breakout Board V2.0
- Lepton vs Lepton 3 App Note
Mechanical
Compliance
- RoHS Certificate of Compliance, Rev 210 (Directive (EU) 2015/863)
- REACH Declaration of Compliance, Rev 250 (March 2026)
- California Proposition 65 Declaration, Rev 120
- Certificate of Volatility
Tips for Integrating Lepton into a Housing
- Use a compliant foam gasket such as PORON between the Lepton and the window.
- Stack order: socket, Lepton, foam, window, enclosure.
- Keep the total force on the Lepton under 1 kg. More can damage the shutter.
- Cut the foam so it clears the shutter's mechanical pins.
- Foam thickness depends on your enclosure and spacing, but the 1 kg limit still applies.
- Windows must pass longwave infrared. Germanium, zinc sulfide and silicon are typical. For accurate radiometry behind a window, characterize its transmission and temperature as described in the Radiometry Quick Start Guide.
Important Information
- PureThermal boards with a radiometric Lepton (2.5, 3.5 or 3.1R) need specialized software to display radiometric data.
- GroupGets does not provide software or coding support.
- International buyers ordering any thermal imaging camera must complete an End Use Statement before shipment. We email it within a few business days.
- We ship to North America, Australia, New Zealand, the UK, Switzerland and EU member states. Orders to other addresses are canceled and refunded.
Export Information
- Part Number: 500-0771-01
- ECCN: CAM 6A993A
- HTSUS: 9027.50.4020
- Country of Origin: USA
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