UH Package 40-Lead Plastic QFN (5mm × 5mm) (Reference LTC DWG # 05-08-1746 Rev B) 0.70 ±0.05 5.50 ±0.05 4.10 ±0.05 3.50 ±0.05 3.60 REF (4 SIDES) 3.50 ±0.05 PACKAGE OUTLINE 0.20 ±0.05 0.40 BSC RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 5.00 ±0.10 (4 SIDES) 0.75 ±0.05 R = 0.05 TYP R = 0.100 TYP 39 40 0.40 ±0.10 PIN 1 TOP MARK (SEE NOTE 5) 1 2 3.60 REF (4-SIDES) 3.50 ±0.10 PIN 1 NOTCH R = 0.30 TYP OR 0.35 × 45° CHAMFER 3.50 ±0.10 (UH40) QFN REV B 0415 0.200 REF 0.00 – 0.05 NOTE: 1. DRAWING CONFIRMS TO JEDEC PACKAGE OUTLINE MO-220 2. ALL DIMENSIONS ARE IN MILLIMETERS 3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.20mm ON ANY SIDE, IF PRESENT 4. EXPOSED PAD SHALL BE SOLDER PLATED 5. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 6. DRAWING NOT TO SCALE 0.20 ± 0.05 0.40 BSC BOTTOM VIEW—EXPOSED PAD