LTC4290/LTC4271
30
429071fb
For more information www.linear.com/LTC4290
UJ Package
40-Lead Plastic QFN (6mm × 6mm)
(Reference LTC DWG # 05-08-1728 Rev Ø)
6.00 0.10
(4 SIDES)
NOTE:
1. DRAWING IS A JEDEC PACKAGE OUTLINE VARIATION OF (WJJD-2)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE, IF PRESENT
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
PIN 1 TOP MARK
(SEE NOTE 6)
PIN 1 NOTCH
R = 0.45 OR
0.35 x 45º
CHAMFER
0.40 0.10
4039
1
2
BOTTOM VIEW—EXPOSED PAD
4.50 REF
(4-SIDES)
4.42 0.10
4.42 0.10
4.42 0.05
4.42 0.05
0.75 0.05
R = 0.115
TYP
0.25 0.05
0.50 BSC
0.200 REF
0.00 – 0.05
(UJ40) QFN REV Ø 0406
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
0.70 0.05
4.50 0.05
(4 SIDES)
5.10 0.05
6.50 0.05
0.25 0.05
0.50 BSC
PACKAGE OUTLINE
R = 0.10
TYP
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
