Reworking QFNs with PDR
PDR’s IR series of SMD/BGA rework stations are engineered to cope with the challenges of repairing today’s PCB assemblies. The systems use PDR’s patented Focused IR technology, the world’s only technology that uses Focused Visible IR Heating. The light that heats. The stations are all nozzle free, gas free, clean, simple and easy to use. Each model is designed for precise control to produce 98% yield of your SMD/BGA rework without complications.
To effectively rework QFNs, in addition to the considerations for BGA rework (see SMD/BGA Rework) we need to pay particular attention to the following issues,
PCB Preheating - in micro applications the heating needs to be especially condensed to a small area to be effective
Component Handling - micro components are difficult to manipulate, increased vacuum and micro-adjustments are needed
Machine Vision - both alignment and process observation systems need to be especially effective with magnification and illumination
Solderpaste Application - Componet Print Frame (CPF) allows the application of solder paste for effective QFN soldering.
WHICH PDR SYSTEM? E3M - Whilst still being able to cope with standard SMDs and BGAs, the best PDR system for QFNs is the new E3M dealing with up to 18" PCBs but with special attention to working on smaller applications and also CPF capability. The D3 series systems offer the ability to provide excellent soldering quality on a lower budget, with slightly simpler mechanics and features.
Recommended Rework Stations
PDR IR-D3 Discovery
The IR-D3 Discovery rework system is tool free, gas free, instantly/precisely controllable, clean, modular, upgradeable and produces 100% yield SMD rework without any complications. Equipped with a multi-zone 2000W PCB preheater, Focused IR component heating, it provides the extremely high levels of profiling and process control necessary for the effective rework of even the most advanced packages, including SMDs, BGAs, CSPs, QFNs and all lead-free applications.
The IR-D3 can be easily configured to your requirements, with a good range of advanced features to choose from, allowing the operator to quickly and safely rework all types of components without overheating the component, adjacents or the PCB. It uses all the proven attributes of PDR’s Focused IR technology, first introduced in 1987 and now used worldwide by over 4500 customers.
The PDR IR-E3M is a high powered system, available with a multi-zone 3050W PCB preheater and is designed to rework SMD / BGA / uBGA / QFN / LEDs on small to medium-large PCB assemblies with upto a 18"/450mm PCB capacity. It is loaded with advanced features delivering many benefits including the highest performance and soldering quality available anywhere, yet it remains simple to set up and use.
The IR-E3 series is also available in 3 models - the E3S, E3G and E3M. Made in the United Kingdom with only the finest components for optimum precision, the PDR IR-E3 is our top selling system and one of the best performing BGA Rework Stations worldwide.