LT8253/LT8253A

19

Rev. 0

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Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications

subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

PACKAGE DESCRIPTION

4.00 ±0.10

(2 SIDES)

2.50 REF

5.00 ±0.10

(2 SIDES)

NOTE:

1. DRAWING NOT TO SCALE

2. ALL DIMENSIONS ARE IN MILLIMETERS

3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

4. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION

ON THE TOP AND BOTTOM OF PACKAGE

PIN 1

TOP MARK

(NOTE 6)

0.40 ±0.10

27

28

1

2

BOTTOM VIEW—EXPOSED PAD

3.50 REF

0.75 ±0.05

R = 0.115

TYP

R = 0.05

TYP

PIN 1 NOTCH

R = 0.20 OR 0.35

× 45° CHAMFER

0.25 ±0.05

0.50 BSC

0.200 REF

0.00 – 0.05

(UFDM28) QFN 1218 REV Ø

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED

0.70 ±0.05

0.25 ±0.05

0.50 BSC

2.50 REF

3.50 REF

4.10 ±0.05

5.50 ±0.05

2.65 ±0.05

3.10 ±0.05

4.50 ±0.05

PACKAGE OUTLINE

2.65 ±0.10

3.65 ±0.10

3.65 ±0.05

UFDM Package

28-Lead Plastic Side Wettable QFN (4mm × 5mm)

(Reference LTC DWG # 05-08-1682 Rev Ø)

0.203 REF

TERMINAL THICKNESS

TERMINAL LENGTH

0.40 ± 0.10

0.05 REF

PLATED AREA

DETAIL A

0.10 REF

DETAIL A