2981 and 2982
8-Channel Source Drivers
Features and Benefits
Description
▪ TTL, DTL, PMOS, or CMOS compatible inputs
▪ 500 mA output source current capability
▪ Transient-protected outputs
▪ Output breakdown voltage to 50 V
▪ DIP or SOIC packaging
Recommended for high-side switching applications that benefit
from separate logic and load grounds, these devices encompass
load supply voltages to 50 V and output currents to -500 mA.
These 8-channel source drivers are useful for interfacing
between low-level logic and high-current loads. Typical loads
include relays, solenoids, lamps, stepper and/or servo motors,
print hammers, and LEDs.
All devices may be used with 5 V logic systems — TTL, Schottky
TTL, DTL, and 5 V CMOS. The device packages offered are
electrically interchangeable, and will withstand a maximum
output off voltage of 50 V, and operate to a minimum of 5 V. All
devices in this series integrate input current limiting resistors
and output transient suppression diodes, and are activated by
an active high input.
Packages:
Not to scale
18-pin DIP (Package A)
The suffix “A” indicates an 18-lead plastic dual in-line package
with copper lead frame for optimum power dissipation. Under
normal operating conditions, these devices will sustain 120 mA
continuously for each of the eight outputs at an ambient
temperature of +50°C and a supply of 15 V.
The suffix “LW” package is provided in a 20-pin wide-body
SOIC package with improved thermal characteristics compared
to the 18-pin SOIC version it replaces (100% pin-compatible
electrically). The A2982ELW driver is available for operation
over an extended temperature range, down to -40°C.
20-pin SOICW (package LW)
(drop-in replacement for discontinued 18-pin SOIC variants)
These packages are lead (Pb) free, with 100% matte-tin
leadframe plating.
Simplified Block Diagrams
18-pin DIP (A Package)
20-pin SOICW (LW Package)
(NC pins, 10 and 11, not present
on discontinued 18-pin LW package)
29310T
2981 and
2982
8-Channel Source Drivers
Selection Guide
Part Number
Package
Packing
Ambient Temperature
TA (°C)
A2982ELWTR-T1
20-pin SOICW
1000 per reel
–40 to 85
A2982SLWTR-T
20-pin SOICW
1000 per reel
UDN2981A-T2
18-pin DIP
21 per tube
UDN2982A-T2
18-pin DIP
21 per tube
–20 to 85
1Variant
is in production but has been determined to be LAST TIME BUY. This classification indicates that the
variant is obsolete and notice has been given. Sale of the variant is currently restricted to existing customer
applications. The variant should not be purchased for new design applications because of obsolescence in the
near future. Samples are no longer available. Status date change November 2, 2009. Deadline for receipt of
LAST TIME BUY orders is April 30, 2010.
2Variant is in production but has been determined to be LAST TIME BUY. This classification indicates that the
variant is obsolete and notice has been given. Sale of the variant is currently restricted to existing customer
applications. The variant should not be purchased for new design applications because of obsolescence in the
near future. Samples are no longer available. Status date change January 30, 2012. Deadline for receipt of
LAST TIME BUY orders is April 27, 2012.
Absolute Maximum Ratings
Characteristic
Symbol
Output Voltage Range
Notes
VCE
Input Voltage
VIN
Output Current
IOUT
Package Power Dissipation
PD
UDN2981
A2982, UDN2982
See graph
Rating
Units
5 to 50
V
20
V
20
V
–500
mA
–
–
Range E
–40 to 85
ºC
Range S
Operating Ambient Temperature
TA
–20 to 85
ºC
Maximum Junction Temperature
TJ(max)
150
ºC
Tstg
–55 to 150
ºC
A L L OWA B L E P A C K A G E P OW E R DIS S IP A T ION (W)
Storage Temperature
2.5
2.0
18-P IN DIP , R
JA
= 65 C /W
20-LE AD S OIC , R
JA
= 90 C /W
1.5
1.0
0.5
0
25
50
75
100
A MB IE NT T E MP E R A T UR E C
125
150
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
2981 and
2982
8-Channel Source Drivers
One of Eight Drivers
Typical electrosensitive
printer application
18-pin DIP (A Package)
20-pin SOICW (LW Package)
R
IN1
1
18
IN
2
2
17
IN3
3
16
IN4
4
15
IN
5
5
14
IN6
6
13
IN7
7
12
IN
8
8
11
VS
9
10
R
R
R
R
R
R
R
R
L
IN1
1
20
L
IN
2
2
19
L
IN3
3
18
IN4
4
17
IN
5
5
16
IN6
6
15
IN7
7
14
IN
8
8
13
VS
9
12
NC
10
11
L
L
L
L
L
R
R
R
R
R
R
R
L
L
L
L
L
L
L
L
NC
Pins 10 and 11 can float; other pins
match discontinued 18-pin SOIC: 1 to 9
same, pins 12 to 20 match pins 10 to 18
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
2981 and
2982
8-Channel Source Drivers
ELECTRICAL CHARACTERISTICS1,2 at TA = +25°C (unless otherwise specified).
Symbol
Variant
Test Fig.
Min.
Typ.
Max.
Units
Output Leakage Current3
Characteristic
ICEX
All
VIN = 0.4 V, VS = 50 V
1
—
—
20
μA
Output Sustaining Voltage
VCE(SUS)
All
IOUT = -45 mA
—
35
—
—
V
VIN = 2.4 V, IOUT = -100 mA
2
—
1.6
1.8
V
VIN = 2.4 V, IOUT = -225 mA
2
—
1.7
1.9
V
VIN = 2.4 V, IOUT = -350 mA
2
—
1.8
2.0
V
VIN = 2.4 V
3
—
140
200
μA
VIN = 3.85 V
3
—
310
450
μA
VIN = 2.4 V
3
—
140
200
μA
VIN = 12 V
3
—
1.25
1.93
mA
Collector-Emitter
Saturation Voltage
VCE(SAT)
All
2981
Input Current
IIN(ON)
2982
Test Conditions
2981
VIN = 2.4 V, VCE = 2.0 V
2
-350
—
—
mA
2982
VIN = 2.4 V, VCE = 2.0 V
2
-350
—
—
mA
IS
All
VIN = 2.4 V*, VS = 50 V
4
—
—
10
mA
Clamp Diode Current
IR
All
VR = 50 V, VIN = 0.4 V*
5
—
—
50
μA
Clamp Diode Forward
Voltage
VF
All
IF = 350 mA
6
—
1.5
2.0
V
Turn-On Delay
tON
All
0.5 EIN to 0.5 EOUT, RL = 100Ω, VS = 35 V
—
—
0.3
2.0
μs
All
0.5 EIN to 0.5 EOUT, RL = 100Ω, VS = 35 V,
See Note
—
—
2.0
10
μs
Output Source Current
(Outputs Open)
Supply Current Leakage
Current
Turn-Off Delay4
1Negative
lOUT
tOFF
current is defined as coming out of (sourcing) the specified device terminal.
2All
unused inputs must be connected to ground. Pull-down resistors (approximately 10 kΩ) are recommended for inputs that are allowed to float while power is being applied to VS.
3All
inputs simultaneously.
4Turn-off
delay is influenced by load conditions. Systems applications well below the specified output loading may require timing considerations for some designs, i.e., multiplexed displays or when used in combination with sink drivers in a totem pole configuration.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
2981 and
2982
8-Channel Source Drivers
TEST FIGURES
Figure 1
Figure 2
VS
VS
V
Figure 3
V
V CE
I IN
mA
V
mA
OPEN
I OUT
VIN
μA
IN
S
V
IN
I CEX
Dwg. No. A-11,083
Dwg. No. A-11,084
Figure 4
Dwg. No. A-11,085
Figure 5
VS
Figure 6
VS
I S mA
OPEN
μA
IR
OPEN
OPEN
VF
VIN
VIN
Dwg. No. A-11,086
Dwg. No. A-11,087
V
I
F
Dwg. No. A-11,088
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
2981 and
2982
8-Channel Source Drivers
Allowable peak collector current
as a function of duty cycle
500
500
450
450
RECOMMENDED MAXIMUM OUTPUT CURRENT
350
3
300
4
5
250
200
NUMBER OF OUTPUTS
CONDUCTING
SIMULTANEOUSLY
8
7
6
150
100
400
ALLOWABLE PEAK COLLECTOR CURRENT IN mA AT 70°C
400
VS = 15 V
RECOMMENDED MAXIMUM OUTPUT CURRENT
350
300
3
4
250
5
200
8
7
6
NUMBER OF OUTPUTS
CONDUCTING
SIMULTANEOUSLY
150
100
VS = 15 V
50
0
50
0
10
20
30
50
60
40
PER CENT DUTY CYCLE
70
80
90
0
100
10
0
20
30
50
60
40
PER CENT DUTY CYCLE
Dwg. No. A-11,107B
70
80
90
100
Dwg. No. A-11,108B
Input current as a function
of input voltage
2.5
2.0
INPUT CURRENT, IIN (mA)
ALLOWABLE PEAK COLLECTOR CURRENT IN mA AT 50°C
UDN2981A and UDN2982A
1.5
UM
IM
X
MA
1.0
AL
PIC
TY
0.5
2
4
6
8
10
12
INPUT VOLTAGE (VOLTS)
Dwg. No. A-11,115B
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
2981 and
2982
8-Channel Source Drivers
A Package, 18-Pin DIP
22.86 ±0.51
18
+0.10
0.25 –0.05
+0.76
6.35 –0.25
+0.38
10.92 –0.25
7.62
A
1
2
5.33 MAX
+0.51
3.30 –0.38
2.54
+0.25
1.52 –0.38
0.46 ±0.12
SEATING
PLANE
C
All dimensions nominal, not for tooling use
(reference JEDEC MS-001 AC)
Dimensions in inches
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
A Terminal #1 mark area
LW Package, 20-Pin SOICW
12.80±0.20
4° ±4
20
20
+0.07
0.27 –0.06
7.50±0.10
10.30±0.33
A
1
2.25
9.50
+0.44
0.84 –0.43
2
1
2
0.65
0.25
20X
SEATING
PLANE
0.10 C
0.41 ±0.10
1.27
C
SEATING PLANE
GAUGE PLANE
1.27
B PCB Layout Reference View
2.65 MAX
0.20 ±0.10
For Reference Only
Dimensions in millimeters
(Reference JEDEC MS-013 AC)
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
A Terminal #1 mark area
B Reference pad layout (reference IPC SOIC127P1030X265-20M)
All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary
to meet application process requirements and PCB layout tolerances
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
2981 and
2982
8-Channel Source Drivers
Revision History
Revision
Revision Date
Rev. T
Januray 30, 2012
Description of Revision
Update product availability
Copyright ©1977-2011, Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit
improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the
information being relied upon is current.
Allegro’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the
failure of that life support device or system, or to affect the safety or effectiveness of that device or system.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use;
nor for any infringement of patents or other rights of third parties which may result from its use.
For the latest version of this document, visit our website:
www.allegromicro.com
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
8