January 2009 Rev 2 1/14
14
ULN2064B, ULN2066B
ULN2068B, ULN2074B
50 V - 1.5 A quad Darlington switches
Features
■Output current to 1.5 A for each Darlington
■Minimum breakdown 50 V
■Sustaining voltage at least 35 V
■Integral suppression diodes (ULN2064B,
ULN2066B and ULN2068B
■Isolated Darlington pinout (ULN2074B)
■Versions compatible with all popular logic
families
Description
Designed to interface logic to a wide variety of
high current, high voltage loads, these devices
each contain four NPN Darlington switches
delivering up to 1.5 A with a specified minimum
breakdown of 50 V and a sustaining voltage of 35
V measured at 100 mA. The ULN2064B,
ULN2066B and ULN2068B contain integral
suppression diodes for inductive loads have
common emitters. The ULN2074B feature
isolated Darlington pinouts and is intended for
applications such as emitter follower
configurations. Inputs of the ULN2064B,
ULN2068B and ULN2074B are compatible with
popular 5 V logic families and the ULN2066B are
compatible with 6 - 15 V CMOS and PMOS. Type
ULN2068B includes a pre-driver stage to reduce
loading on the control logic.
PowerDIP-16
Table 1. Device summary
Part numbers Package
ULN2064B PowerDIP-16
ULN2066B PowerDIP-16
ULN2068B PowerDIP-16
ULN2074B PowerDIP-16
www.st.com
Contents ULN2064B, ULN2066B, ULN2068B, ULN2074B
2/14
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Mounting instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Typical applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
ULN2064B, ULN2066B, ULN2068B, ULN2074B Diagram
3/14
1 Diagram
Figure 1. Schematic diagrams
ULN2068B: RIN = 2.5kΩ, RS = 900Ω
ULN2074B: RIN = 350Ω
ULN2066B: RIN = 3kΩ
ULN2064B: RIN = 350Ω
Pin configuration ULN2064B, ULN2066B, ULN2068B, ULN2074B
4/14
2 Pin configuration
Figure 2. Pin connections (top view)
ULN2068B
ULN2066B
ULN2074B
ULN2064B
ULN2064B, ULN2066B, ULN2068B, ULN2074B Maximum ratings
5/14
3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
CEX
Output voltage 50 V
V
CE(SUS)
Output sustaining voltage 35 V
I
O
Output current 1.75 A
V
I
Input voltage ULN2066B - 2074B 30 V
Input voltage ULN2064B - 2068B 15
I
I
Input current 25 mA
V
S
Supply voltage for ULN2068B 10 V
P
TOT
Power dissipation at T
PINS
= 90 °C 4.3 W
Power dissipation at T
AMB
= 70 °C 1
T
AMB
Operating ambient temperature range - 20 to 85 °C
T
STG
Storage temperature - 55 to 150 °C
Electrical characteristics ULN2064B, ULN2066B, ULN2068B, ULN2074B
6/14
4 Electrical characteristics
Note: Input voltage is with reference to the substrate (no connection to any other pins) for the
ULN2074B reference is ground for all other types.
Note: 1 Input current may be limited by maximum allowable input voltage.
Table 3. Electrical characteristics (T
A
= 25 °C unless otherwise specified).
Symbol Parameter Test condition Min. Typ. Max. Unit
I
CEX
Output leakage current
(Figure 5)
V
CE
= 50V, T
A
= 25°C 100 µA
V
CE
= 50V, T
A
= 70°C 500
V
CE(SUS)
Collector-emitter sustaining
voltage (Figure 4)I
C
= 100mA, V
I
= 0.4V 35 V
V
CE(SAT)
Collector-emitter saturation
voltage (Figure 5)
I
C
= 500mA, I
B
= 325µA 1.1
V
I
C
= 750mA, I
B
= 935µA 1.2
I
C
= 1A, I
B
= 1.25mA 1.3
I
C
= 1.25A, I
B
= 2mA 1.4
I
I(ON)
Input current (Figure 6)
for ULN2064B and ULN2074B
V
I
= 2.4V
V
I
= 3.75V
1.4
3.3
4.3
9.6
mA
for ULN2066B,
V
I
= 5V
V
I
= 12V
0.6
1.7
1.8
5.2
for ULN2068B,
V
I
= 2.75V
V
I
= 3.75V
0.55
1.0
V
I(ON)
Input voltage (Figure 7)
V
CE
= 2V, IC = 1A
ULN2064B, ULN2074B,
ULN2066B
V
CE
= 2V, IC = 1.5A
ULN2064B, ULN2074B,
ULN2066B
ULN2068B
2
6.5
2.5
10
2.75
V
I
S
Supply current (Figure 10)for ULN2068B, V
I
= 2.75V,
I
C
= 500mA 6mA
t
PLH
Turn-on delay time 0.5 V
I
to 0.5V
O
1µs
t
PHL
Turn-off delay time 0.5 V
I
to 0.5V
O
1.5 µs
I
R
Clamp diode leakage current
(Figure 8)
For ULN2064B - ULN2066B -
ULN2068B, V
R
= 50V
TA = 25°C
TA = 70°C
50
100
µA
V
F
Clamp diode forward voltage
(Figure 9)
For ULN2064B - ULN2066B -
ULN2068B
I
F
= 1A
I
F
= 1.5A
1.75
2
V
ULN2064B, ULN2066B, ULN2068B, ULN2074B Test circuits
7/14
5 Test circuits
Figure 3. Output leakage current Figure 4. Collector-emitter sustaining voltage
Figure 5. Collector-emitter saturation voltage Figure 6. Input current (ON)
Figure 7. Input voltage Figure 8. Clamp diode leakage current
Test circuits ULN2064B, ULN2066B, ULN2068B, ULN2074B
8/14
Figure 9. Clamp diode forward voltage Figure 10. Supply current
Figure 11. Input current as a function of input
voltage
Figure 12. Input current as a function of input
voltage
Figure 13. Collector current as a function of
input current
ULN2064B, ULN2066B, ULN2068B, ULN2074B Mounting instructions
9/14
6 Mounting instructions
The RthJA can be reduced by soldering the GND pins to a suitable copper area of the printed
circuit board (Figure 14) or to an external heatsink (Figure 15).
The diagram of Figure 16 shows the maximum dissipated power PTOT and the RthJA as a
function of the side "α" of two equal square copper areas having a thickness of 35 µ (1.4
mils).
During soldering the pins temperature must not exceed 260 °C and the soldering time must
not be longer than 12 seconds.
The external heatsink or printed circuit copper area must be connected to electrical ground.
Figure 14. Example of P.C. board area which is
used as heatsink
Figure 15. External heatsink mounting
example
Figure 16. Maximum dissipated power and
junction to ambient thermal
resistance vs. side "α"
Figure 17. Maximum allowable power
dissipation vs. ambient
temperature
Typical applications ULN2064B, ULN2066B, ULN2068B, ULN2074B
10/14
7 Typical applications
Figure 18. Common-anode LED drivers
Figure 19. Common-cathode LED drivers
ULN2064B, ULN2066B, ULN2068B, ULN2074B Package mechanical data
11/14
8 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Package mechanical data ULN2064B, ULN2066B, ULN2068B, ULN2074B
12/14
Dim. mm inch.
Min. Typ. Max. Min. Typ. Max.
a1 0.51 0.020
B0.85 1.40 0.033 0.055
b0.50 0.020
b10.38 0.50 0.015 0.020
D 20.0 0.787
E8.800.346
e 2.54 0.100
e317.780.700
F 7.10 0.280
I 5.10 0.201
L3.300.130
Z 1.27 0.050
PowerDIP-16
OUTLINE AND
MECHANICAL DATA
ULN2064B, ULN2066B, ULN2068B, ULN2074B
14/14
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