What’s PQFN Package?
Power Quad Flat No-leads (PQFN) is a small square-shaped or rectangular surface-mount plastic package with no leads that is capable of high power dissipation. Instead of leads, it uses metal pads around the periphery of the bottom of the package body for electrical connection to the outside world. It is basically a ‘high-power’ version of the quad flat no leads (QFN) package.
Power Quad Flat No-leads (PQFN)
The capability of the PQFN to handle the heat emitted by high-power devices comes from one or more exposed heat sinks at the package bottom, as well as its use of thick copper lead frames, solder die attach material, and heavy-gauge bonding wires. The heat sinks, which are physically connected to the die pad, efficiently transfer the excess heat from the die to the PCB.
Typical pad counts range from 8 to 42. The maximum package height values of different Power QFN packages vary widely, ranging from 0.9 mm to over 2 mm. The body sizes of typical Power QFNs range from 5 mm. square to 12 mm. square. The pad pitch (distance between pads) is usually one of the following: 0.50 mm, 0.65 mm, 0.80 mm, and 0.90 mm.
| Properties of Some Examples | |||
| No. of Pads | Body Size | Package Height | Pad Pitch |
| 8 | 3.3 x 3.3mm | 1.1mm | 0.65mm |
| 16 | 4 x 4mm | 0.9mm | 0.65mm |
| 20 | 5 x 6mm | 0.9mm | 0.80mm |
| 24 | 12 x 12mm | 2.2mm | 0.90mm |
| 28 | 5 x 5mm | 0.9mm | 0.50mm |
| 32 | 4 x 6mm | 0.9mm | 0.50mm |
| 32 | 8 x 8mm | 2.2mm | 0.80mm |