TO-220 heatsink (LM317)
Black-anodised aluminium, 15 °C/W in free air · drop it on a TO-220 part (MOSFET, 7805, LM317) to attach it
Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Typical part: TO-220 aluminium heatsink
Ratings and limits
| θ sink→air | 15 °C/W (natural convection) |
|---|---|
| Mounting | M3 screw + thermal pad (≈ 1.5 °C/W) |
| Tab | is electrically live (drain / output): insulate it if the sink touches anything |
How to use it
T_j = T_amb + P × (θ_jc + θ_pad + θ_sink). A 7805 dropping 7 V at 0.5 A (3.5 W) needs about 20 °C/W total to stay under 125 °C at 40 °C ambient.