The client has made the following changes to the job.
Client prefers freelancers from:
San Jose, United States
You are still able to submit a proposal for this job.
The client prefers freelancers from
a different location.
Promex ( [obscured] -ind.com) seeks a skilled AutoCAD designer to develop a series of drawings to support additional configurations of QFNs (Quad Flatpack No leads).
Promex has a process for building a variety of two types of QFNs; overmolded QFNs that have a semiconductor device in them and Open Cavity QFNs that do not.
Overview of QFN Configurations
QFNs are generally built in mm increment sizes such as; 2 mm x 2 mm; 3 mm x 3 mm, 4 mm x 4 mm, …..10 mm x 10 mm, and 12 mm x 12 mm. QFNs are generally not made in sizes larger than 12 mm x 12 mm. They are often built in non-square sizes (3 mm x 4 mm for example), in fractional sizes (2.5 mm x 2.5 mm, for example) or with leads on only 2 sides vs 4 when they are referred to as DFNs (Dual Flatpack No leads).
The standard lead spacings are 0.4 mm; 0.5 mm; 0.65 mm and 0.8 mm. Odd lead spacing are not common but deleting a lead or attaching a lead to a central ground pad is common.
The leadframes to be designed are c...
Sign in or Register to see more