A3981 Allegro Micro Systems, Inc., A3981 Datasheet - Page 33

• Manufacturer Part Number: A3981
• Manufacturer: Allegro Micro Systems, Inc.

A3981
28X
0.10
C
0.30
0.19
28
1
A
2
5.08 NOM
9.70±0.10
0.65 BSC
B
Branded Face
Package LP, 28-Pin TSSOP
with Exposed Thermal Pad
3 NOM
Automotive, Programmable Stepper Driver
0.15
0.00
4.40±0.10
SEATING
PLANE
1.20 MAX
6.40±0.20
C
A Terminal #1 mark area
B
C
For Reference Only; not for tooling use (reference MO-153 AET)
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
Exposed thermal pad (bottom surface); dimensions may vary with device
Reference land pattern layout (reference IPC7351
SOP65P640X120-29CM);
All pads a minimum of 0.20 mm from all adjacent pads; adjust as
necessary to meet application process requirements and PCB layout
tolerances; when mounting on a multilayer PCB, thermal vias at the
exposed thermal pad land can improve thermal dissipation (reference
EIA/JEDEC Standard JESD51-5)
GAUGE PLANE
0.25 BSC
8º
0º
0.60 ±0.15
SEATING PLANE
0.20
0.09
1.00 REF
1.65
28
1
2
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
0.45
C
PCB Layout Reference View
5.00
0.65
3.00
6.10
33