Hi Jorgen,
The Package Drawing is here: https://www.ti.com/lit/ml/mpqf248b/mpqf248b.pdf?ts=1642794611170&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTMUX1072
For some reason - this drawing does not include an example land - pattern and solder mask details - however other similar UQFN's do - and the rules that they have can be transcribed to the above drawing.
The examples are a 10 pin UQFN and a 16 pin UQFN.
Using the 16 pin as an example - take a look at the package drawing , land pattern/solder mask (pattern and mask are same dimensions - please follow solder mask details on the 16pin or 10pin UQFN as it will be the same for the 12 pin as with the 1072) (shown below):
Package Drawing:
Variables:
L = Length = Typical 1.8mm
W = Width = Typical 2.6mm
TP = Top and Bottom Oriented Pins Length = Typical 0.4mm
SP = Side Oriented Pins Length = Typical 0.5mm
PW = Pin Width = 0.2mm
E = Pitch = 0.4mm
-----------------------------------------------------------------------------------------------------------------------------
Land Pattern Drawing:
Variables:
L_LP = Length of Land Pattern = 1.6mm
W_LP = Width of Land Pattern = 2.4mm
TP_LP = Top and Bottom Oriented Pins Length of Land Pattern= 0.6mm
SP_LP = Side Oriented Pins Length of Land Pattern = 0.7mm
PW_LP = Pin Width of Land Pattern = 0.2mm
E_LP = Pitch of Land Pattern = 0.4mm
If you look at how these dimensions change - its actually standardized between pin counts (look at the 10 pin package and the same pattern will emerge) - which is the following:
L_LP = Length of Land Pattern = L - 0.2mm
W_LP = Width of Land Pattern =W - 0.2mm
TP_LP = Top and Bottom Oriented Pins Length of Land Pattern= TP + 0.2mm
SP_LP = Side Oriented Pins Length of Land Pattern =SP + 0.2mm
PW_LP = Pin Width of Land Pattern = PW
E_LP = Pitch of Land Pattern = E
TMUX1072 Land Pattern Dimensions
Which when we plug that in for the TMUX1072's UQFN package we get the following results:
L = Length = Typical 2mm
W = Width = Typical 1.7mm
TP = Top and Bottom Oriented Pins Length = Typical 0.5mm
SP = Side Oriented Pins Length = Typical 0.4mm
PW = Pin Width = 0.2mm
E = Pitch = 0.4mm
Converting that into the Land Pattern Measurements:
L_LP = Length of Land Pattern = L - 0.2mm = 1.8mm
W_LP = Width of Land Pattern =W - 0.2mm = 1.5mm
TP_LP = Top and Bottom Oriented Pins Length of Land Pattern= TP + 0.2mm = 0.7mm
SP_LP = Side Oriented Pins Length of Land Pattern =SP + 0.2mm = 0.6mm
PW_LP = Pin Width of Land Pattern = PW = 0.2mm
E_LP = Pitch of Land Pattern = E = 0.4mm
For the Solder Mask Please see below:
This is the same details we recommend on all our UQFN switches.
If you have any other questions please let me know!
Best,
Parker Dodson
