Allegro UDN2879W-2, UDN2879W, UDN2878W Datasheet
2878
AND
2879
QUAD HIGH-CURRENT
DARLINGTON SWITCHES
These quad Darlington arrays are designed to serve as interface
between low-level logic and peripheral power devices such as solenoids, motors, incandescent displays, heaters, and similar loads of up to
320 W per channel. Both integrated circuits include transient-suppression diodes that enable use with inductive loads. The input logic is
compatible with most TTL, DTL, LSTTL, and 5 V CMOS logic.
Type UDN2878W and UDN2879W 4 A arrays are identical except
for output-voltage ratings. The former is rated for operation to 50 V
(35 V sustaining), while the latter has a minimum output breakdown
rating of 80 V (50 V sustaining). The lower-cost UDN2879W-2 is
recommended for applications requiring load currents of 3 A or less.
These less expensive devices are identical to the basic parts except for
the maximum allowable load-current rating.
29305.10B†
Data Sheet
Dwg. No. A-11,974
ABSOLUTE MAXIMUM RATINGS
at +25°C Free-Air Temperature
for any driver
(unless otherwise noted)
Output Voltage, V
(UDN2878W) . . . . . . . . . . . . . . . . 50 V
(UDN2879W & UDN2879W-2) . . 80 V
Output Current, l
(UDN2878W & UDN2879W) . . . 5.0 A
(UDN2879W-2) . . . . . . . . . . . . . 4.0 A
Input Voltage, V
Input Current, IIN. . . . . . . . . . . . . . . 25 mA
Supply Voltage, V
Total Package Power Dissipation,
. . . . . . . . . . . . . . . . . . . . See Graph
P
D
Operating Ambient Temperature Range,
TA. . . . . . . . . . . . . . . . -20°C to +85°C
Storage Temperature Range,
TS. . . . . . . . . . . . . . . -55°C to +150°C
CEX
C
. . . . . . . . . . . . . . . . 15 V
IN
. . . . . . . . . . . . . . . 10 V
S
For maximum power-handling capability, all drivers are supplied
in a 12-pin single in-line power-tab package. The tab needs no insulation. External heat sinks are usually required for proper operation of
these devices.
FEATURES
■ Output Currents to 4 A
■ Output Voltages to 80 V
■ Loads to 1280 W
■ TTL, DTL, or CMOS Compatible Inputs
■ Internal Clamp Diodes
■ Plastic Single In-Line Package
■ Heat-Sink Tab
Always order by complete part number:
Part Number Max. ICMax. V
UDN2878W 5.0 A 50 V 35 V
UDN2879W 5.0 A 80 V 50 V
UDN2879W-2 4.0 A 80 V 50 V
CEX
Min. V
CE (sus)
2878
AND
2879
QUAD HIGH-CURRENT
DARLINGTON SWITCHES
10
R = 2.0°C/W
θJT
8
6
12°C/W HEAT SINK
4
2
FREE AIR, R = 38°C/W
0
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
25
50 75 100 125 150
TEMPERATURE IN °C
3.0°C/W HEAT SINK
R = 14°C/W
θJA
θJA
R = 5.0°C/W
θJA
PARTIAL SCHEMATIC
One of 4 Drivers
Dwg. GP-012B
NOTE: Pin 3 must be connected to ground for proper operation.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1983, 2000 Allegro MicroSystems, Inc.
Dwg. No. A-12,037
2878
AND
QUAD HIGH-CURRENT
DARLINGTON SWITCHES
ELECTRICAL CHARACTERISTICS at VS = 5.0 V, TA = +25°C (unless otherwise noted).
2879
Test Applicable
Limits
Characteristic Symbol Fig. Devices Test Conditions Min. Max. Units
Output Leakage Current I
CEX
1 UDN2878W VCE = 50 V — 100 µA
V
= 50 V, TA = +70°C — 500 µA
CE
UDN2879W/W-2 V
= 80 V — 100 µA
CE
VCE = 80 V, TA = +70°C — 500 µA
Output Sustaining V
Voltage
CE(sus)
— UDN2878W lC = 4 A, L = 10 mH 35 — V
UDN2879W l
= 4 A, L = 10 mH 50 — V
C
UDN2879W-2 lC = 3 A, L = 10 mH 50 — V
Collector-Emitter V
Saturation Voltage
CE(SAT)
2All l
= 500 mA, VIN = 2.75 V — 1.1 V
C
l
= 1.0 A, VIN = 2.75 V — 1.3 V
C
lC = 2.0 A, VIN = 2.75 V — 1.5 V
l
= 3.0 A, VIN = 2.75 V — 1.9 V
C
Input Current I
Input Voltage V
IN
IN(ON)
UDN2878/79W l
3All V
4All V
= 4.0 A, VIN = 3.0 V — 2.4 V
C
= 2.75 V — 550 µA
IN
V
= 3.75 V — 1000 µA
IN
= 2.2 V, lC = 3.0 A — 2.75 V
CE
UDN2878/79W VCE = 2.2 V, lC = 4.0 A — 2.75 V
Supply Current per Driver I
Turn-On Delay t
Turn-Off Delay t
Clamp Diode I
S
PLH
PHL
R
7All l
— All 0.5 Ein to 0.5 E
— All 0.5 Ein to 0.5 E
5All V
Leakage Current
UDN2879W/W-2 VR = 80 V — 50 µA
Clamp Diode V
Forward Voltage
F
6All I
UDN2878/79W IF = 4.0 A — 3.0 V
Caution: High-current tests are pulse tests or require heat sinking.
= 500 mA, VIN = 2.75 V — 6.0 mA
C
out
, lC = 3.0 A — 1.5 µs
out
= 50 V — 50 µA
R
V
= 50 V, TA = +70°C — 100 µA
R
V
= 80 V, TA = +70°C — 100 µA
R
= 3.0 A — 2.5 V
F
— 1.0 µs
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