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2981 THRU
2984
UDN2981A thru UDN2984A
1 18
2 17
3 16
4 15
5 14
6 13
7 12
8 11
VS GND
Dwg. No. A-10, 243
Note that the UDN2980A series (dual in-line
package) and UDN2980LW series (small-outline
IC package) are electrically identical and share a
common terminal number assignment.
ABSOLUTE MAXIMUM RATINGS
at 25°C Free-Air Temperature
Output Voltage Range, VCE
(UDN2981A, UDN2982A,
UDN2982LW, and A2982SLW) . . 5 V to 50 V
(UDN2983A, UDN2984A,
UDN2984LW, and A2984SLW) . 35 V to 80 V
Input Voltage, VIN
(UDN2981A and UDN2983A) . . . . . . . . . 15 V
(UDN2982A, UDN2984A,
UDN2982LW, UDN2984LW,
A2982SLW, and A2984SLW) . . . . . . . . . 20 V
Output Current, IOUT . . . . . . . . . . . . . . -500 mA
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
TA . . . . . . . . . . . . . . . . . . . . -20°C to +85°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . . . . . -55°C to +150°C
8-CHANNEL SOURCE DRIVERS
Recommended for high-side switching applications that benefit from
separate logic and load grounds, these devices encompass load supply
voltages to 80 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 UDN2981A, UDN2982A, UDN2982LW, and
A2982SLW are electrically interchangeable, will withstand a maximum
output off voltage of 50 V, and operate to a minimum of 5 V; the UDN2983A,
UDN2984A, UDN2984LW, and A2984SLW drivers are electrically inter-
changeable, will withstand an output voltage of 80 V, and operate to a
minimum of 35 V. All devices in this series integrate input current limiting
resistors and output transient suppression diodes, and are activated by an
active high input.
The suffix ‘A’ (all devices) 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’ (UDN2982LW and UDN2984LW only) indicates an 18-
lead surface-mountable wide-body SOIC package; the A2982SLW and
A2984SLW are provided in a 20-lead wide-body SOIC package with im-
proved thermal characteristics.
The UDN2982A, UDN2982LW, A2982SLW, UDN2984A,
UDN2984LW, and A2984SLW drivers are also available for operation over
an extended temperature range to -40°C. To order, change the prefix ‘UDN’
to ‘UDQ’ or the suffix ‘SLW’ to ‘ELW’.
FEATURES
I TTL, DTL, PMOS, or CMOS Compatible Inputs
I 500 mA Output Source Current Capability
I Transient-Protected Outputs
I Output Breakdown Voltage to 80 V
I DIP or SOIC Packaging
Always order by complete part number, e.g., UDN2981A .
Note that all devices are not available in all package styles.

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2981 THRU 2984
8-CHANNEL
SOURCE DRIVERS
One of Eight Drivers
V5
9
20 K
INPUT
GROUND
2983/84 ONLY
1.5 K
7.2 K
3K
OUTPUT
Dwg. No. A-10,242B
2.5
A2982SLW and A2984SLW
1
2
3
4
5
6
7
8
+VS
NO
CONNECTION
9
10 NC
20
19
18
17
16
15
14
13
12 GROUND
NC 11
NO
CONNECTION
Dwg. PP-064-2
18-PIN DIP, RθJA = 60°C/W
2.0
20-LEAD SOIC, RθJA = 70°C/W
18-LEAD SOIC, RθJA = 80°C/W
1.5
1.0
0.5
0
25
50 75 100 125
AMBIENT TEMPERATURE IN °C
150
Dwg. GP-022-4
115 Northeast Cutoff, Box 15036
2 Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1977, 2000 Allegro MicroSystems, Inc.

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2981 THRU 2984
8-CHANNEL
SOURCE DRIVERS
ELECTRICAL CHARACTERISTICS at TA = +25°C (unless otherwise specified).
Characteristic
Symbol
Output Leakage Current ICEX
Output Sustaining
Voltage
VCE(SUS)
Applicable
Devices
2981/82†
2983/84†
2981/82†
2983/84†
Test Conditions
Test
Limits
Fig. Min. Typ. Max. Units
VIN = 0.4 V*, VS = 50 V, TA = +70°C 1 — — 200
VIN = 0.4 V*, VS = 80 V, TA = +70°C 1 — — 200
µA
µA
IOUT = -45 mA
IOUT = -70 mA
— 35 — —
— 45 — —
V
V
Collector-Emitter
VIN = 2.4 V, IOUT = -100 mA
2 — 1.6 1.8
V
Saturation Voltage
VCE(SAT)
All 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
Input Current
2981/83A
VIN = 2.4 V
3 — 140 200 µA
IIN(ON)
VIN = 3.85 V
3 — 310 450 µA
2982/84†
VIN = 2.4 V
3 — 140 200 µA
VIN = 12 V
3 — 1.25 1.93 mA
Output Source Current
lOUT
2981/83A
VIN = 2.4 V, VCE = 2.0 V
2 -350 — —
mA
(Outputs Open)
2982/84†
VIN = 2.4 V, VCE = 2.0 V
2 -350 — —
mA
Supply Current
IS
2981/82†
VIN = 2.4 V*, VS = 50 V
4 — — 10
mA
Leakage Current
2983/84†
VIN = 2.4 V*, VS = 80 V
4 — — 10
mA
Clamp Diode
IR
2981/82†
VR = 50 V, VIN = 0.4 V*
5 — — 50
µA
Forward Voltage
2983/84†
VR = 80 V, VIN = 0.4 V*
5 — — 50
µA
Clamp Diode
VF All IF = 350 mA
6 — 1.5 2.0
V
Turn-On Delay
tON
All
0.5 EIN to 0.5 EOUT, RL = 100,
— — 1.0 2.0
µs
VS = 35 V
Turn-Off Delay
tOFF
All
0.5 EIN to 0.5 EOUT, RL = 100,
— — 5.0 10
µs
VS = 35 V, See Note
NOTES: Turn-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.
Negative current is defined as coming out of (sourcing) the specified device terminal.
* All inputs simultaneously.
† Complete part number includes a prefix (A or UDN) and a suffix (A or SLW) as follows:
UDN2981A,
UDN2982A, UDN2982LW, or A2982SLW,
UDN2983A,
UDN2984A, UDN2984LW, or A2984SLW.
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2981 THRU 2984
8-CHANNEL
SOURCE DRIVERS
Figure 1
VS
VIN
µA
I CEX
Dwg. No. A-11,083
TEST FIGURES
Figure 2
VS
VCE
V
mA
IOUT
VIN
Dwg. No. A-11,084
Figure 3
VS
I IN
mA
VIN
OPEN
Dwg. No. A-11,085
Figure 4
VS
I S mA
VIN
OPEN
Dwg. No. A-11,086
Figure 5
VS
IR
µA
VIN
Dwg. No. A-11,087
Figure 6
OPEN
OPEN
VF V
IF
Dwg. No. A-11,088
115 Northeast Cutoff, Box 15036
4 Worcester, Massachusetts 01615-0036 (508) 853-5000

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2981 THRU 2984
8-CHANNEL
SOURCE DRIVERS
Allowable peak collector current
as a function of duty cycle
Series UDN2980A
500 500
450 450
400
RECOMMENDED MAXIMUM OUTPUT CURRENT
350
300
4
250 5
6
87
200
NUMBER OF OUTPUTS
CONDUCTING
SIMULTANEOUSLY
150
3
400
RECOMMENDED MAXIMUM OUTPUT CURRENT
350
300
250 4
5
6
200
NUMBER OF OUTPUTS
CONDUCTING
8
7
SIMULTANEOUSLY
150
3
100 VS = 35 V
50
100 VS = 35 V
50
0
0
500
10 20 30 40 50 60 70 80
PER CENT DUTY CYCLE
90 100
Dwg. No. A-11,106B
0
0 10 20 30 40 50 60 70 80 90 100
PER CENT DUTY CYCLE
Dwg. No. A-11,111B
UDN2981A and UDN2982A
500
450 450
400
RECOMMENDED MAXIMUM OUTPUT CURRENT
350
300
4
250 5
6
7
200 8
NUMBER OF OUTPUTS
CONDUCTING
SIMULTANEOUSLY
150
100 VS = 15 V
50
3
400
RECOMMENDED MAXIMUM OUTPUT CURRENT
350
300
250 4
5
200 6
7
8
150 NUMBER OF OUTPUTS
CONDUCTING
SIMULTANEOUSLY
100
VS = 15 V
50
3
0
0 10 20 30 40 50 60 70 80 90 100
PER CENT DUTY CYCLE
Dwg. No. A-11,107B
0
0 10 20 30 40 50 60 70 80 90 100
PER CENT DUTY CYCLE
Dwg. No. A-11,108B
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