Thermal materials for 4K security cameras
Thin thermal pads allow 4K security cameras to operate continuously outdoors under hot sun without overheating, avoiding image noise, system freezes and reduced component lifespan.
A 4K camera integrates an image processor, video encoder, AI recognition and infrared illuminators in a sealed waterproof housing. Total power consumption can reach 6–12 W, most of which turns into heat. When mounted in the midday summer sun, the temperature inside the housing can easily exceed 70°C.
Housings sealed to IP66 or higher do not allow fans or vents, so all the heat must be conducted to the metal housing and then dissipated into the environment.
How temperature affects image quality
A heated image sensor generates more dark current, increasing noise, especially in night mode. An overheating processor will throttle its clock speed, causing frame rate drops or loss of analytics features. Capacitors and memory also degrade faster at high temperatures.
Thermal material solutions
| Position | Recommended material | Thickness | Thermal conductivity |
|---|---|---|---|
| SoC processor to aluminum housing | Silicone gap pad | 0.5–1.5 mm | 3–6 W/m·K |
| Image sensor | Ultra-soft thermal pad | 0.3–0.8 mm | 2–4 W/m·K |
| Infrared LEDs | Thermal adhesive or thermally conductive insulating pad | 0.1–0.3 mm | 1–3 W/m·K |
| PoE power supply | Thermally conductive potting compound | By volume | 0.8–2 W/m·K |
Considerations when choosing thermal pads
Softness and compression force
A pad that is too hard transfers pressure onto the circuit board, which can bend the board or crack solder joints. For cameras, choose pads below Shore 00 50.
Silicone oil bleed
Some silicone pads bleed oil over time, which can deposit on the lens and cause haze. Choose low-bleed grades or silicone-free materials in areas near the optics.
Thermal durability and flame retardancy
Materials must meet UL 94 V-0 and withstand a range of -40°C to 125°C.
- Run thermal simulations before selecting thickness.
- Test in a 60°C thermal chamber with simulated solar radiation.
- Measure SoC temperature using the internal sensor.
Beyond materials, housing design also plays a major role: die-cast aluminum housings with cooling fins, sun shields and light-colored paint can lower internal temperatures by several more degrees. Combined with the right thermal pads, many designs achieve a 10–15°C reduction at the processor compared with relying only on the air inside the housing.
AMS supplies Bergquist and Shin-Etsu thermal pads cut to size. Contact AMS Vietnam for advice.
