SGS Thomson Microelectronics ST931ZT Datasheet
®
HIGH VOLTAGE IGNITION COIL DRIVER
■ VERY RUGGED BI POLAR TECHNOLOGY
■ BUILT IN CLAMPING ZENER
■ HIGH OPERATING JUNCTIO N
TEMPERAT URE
APPLICATIONS
■ HIGH RUGGEDNES S ELECT RO NIC
IGNITIONS
DESCRIPTION
The ST931ZT is specifically designed for
automotive electronic ignition.
The built in clamping Zener is characterized with
tight voltage spread range (350V to 500V).
ST931ZT
NPN POWER DARLINGTON
3
2
1
TO-220
INTER NAL SCH E M ATI C DIAG RA M
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
I
I
P
T
Collector-Emitter Voltage (IB = 0) 350 V
CEO
Emitter-Base Voltage (IC = 0) 5 V
EBO
Collector Current 10 A
I
C
Collector Peak Current 15 A
CM
Base Current 1 A
I
B
Base Peak Current 5 A
BM
Total Dissipation at Tc = 25 oC 125 W
tot
Storage Temperature -65 to 175
stg
Max. Operating Junction Temperature 175
T
j
o
C
o
C
March 1999
1/4
ST931ZT
THERMAL DATA
R
thj-case
Thermal Resistance Junction-case Max 1.2
o
C/W
ELECTRICAL CHARACTERISTICS (T
= 25 oC unless otherwise specified)
case
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
I
V
V
CE(sat)
V
BE(sat)
CEO
EBO
CL
Collector Cut-off
Current (I
= 0)
B
Emitter Cut-off Current
(I
= 0)
C
= 300 V
V
CE
V
= 300 V Tj = 125 oC
CE
= 5 V 20 mA
V
EB
100
0.5
∗ Clamping Voltage IC = 100 mA 350 500 V
∗ Collector-Emitter
Saturation Voltage
∗ Base-Emitter
Saturation Voltage
IC = 7 A IB = 70 mA
I
= 8 A IB = 100 mA
C
IC = 7 A IB = 70 mA
I
= 8 A IB = 100 mA
C
1.6
1.8
2.2
2.4
hFE∗ DC Current Gain IC = 5 A VCE = 10 V 300
V
Diode Forward Voltage IF = 8 A 2.5 V
F
Functional Test
VCC = 24 V L= 7 mH 8 A
(see fig. 1)
INDUCTIVE LOAD
s
t
f
Storage Time
Fall Time
t
(see fig. 3)
∗ Pulsed: Pulse duration = 300 µs, duty cycle 1.5 %
V
= 12 V L= 7 mH V
CC
V
I
= 7 A IB = 70 mA
C
= 0 RBE = 47 Ω
V
BE
clamp
= 300
15
0.5
µA
mA
V
V
V
V
µs
µs
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