SM6A27 TRANSIENT SUPPRESSOR
SURFACE MOUNT AUTOMOTIVE TRANSIENT VOLTAGE SUPPRESSOR
Zener Voltage - 27.0 Volts Peak Pulse Current - 90.0 Amps
FEATURES
¨ Ideally suited for load dump protection
¨ Plastic package has Underwriters Laboratory
Flammability Classification 94V-0
¨ High temperature stability due to unique oxide passivation
¨ Exclusive patented PARª oxide passivated
chip construction
¨ Integrally molded heatsink provides
a very low thermal resistance
for maximum heat dissipation
¨ Low leakage current at T
J
=175¡C
¨ Low forward voltage drop
¨ High temperature soldering guaranteed:
260¡C for 10 seconds at terminals
MECHANICAL DATA
Case: Molded plastic body, surface mount with heatsink
integrally mounted in the encapsulation
Terminals: Plated, solderable per MIL-STD-750,
Method 2026
Polarity: Heatsink is anode
Mounting Position: Any
Weight: 0.091 ounce, 2.58 grams
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
Ratings at 25¡C ambient temperature unless otherwise specified.
SYMBOLS
SM6A27
UNITS
Steady state power dissipation
P
D
6.0
Watts
Non-repetitive peak reverse surge current for 10
ms/10ms
exponentially decaying waveform
I
RSM
90.0
Amps
Maximum working peak stand-off voltage
V
WM
22.0
Volts
Minimum reverse zener voltage at 10mA
V
Z
24.0
Volts
Maximum reverse zener voltage at 10mA
V
Z
30.0
Volts
Maximum zener voltage temperature coefficient at I
Z
=10mA
V
ZTC
36.0
mV/¡C
Peak forward surge current, 8.3ms single half sine-wave
I
FSM
600.0
Amps
Maximum clamping voltage for 10
ms/10ms exponentially
decaying waveform at I
PP
=65A
V
C
40.0
Volts
Maximum instantaneous forward voltage at 6.0A
(NOTE 1)
V
F
0.99
Volts
Maximum reverse leakage current at rated V
WM
T
J
=25¡C
0.5
T
J
=175¡C
I
R
20.0
mA
Maximum thermal resistance junction to case
R
QJC
0.95
¡C/W
Operating junction and storage temperature range
T
J
, T
STG
-55 to +175
¡C
NOTE:
(1) Measured on a 300
ms square pulse width
NOTICE: Advanced product information is subject to change without notice
2/23/99
Dimensions in inches
and
(millimeters)
0.093(2.4)
0.116(3.0)
0.059(1.5)
0.098(2.5)
0.098(2.5)
0.138(3.5)
0.366(9.3)
0.343(8.7)
0.406(10.3)
0.382(9.7)
0.342(8.7)
0.327(8.3)
0.413(10.5)
0.374(9.5)
0.539(13.7)
0.524(13.3)
LEAD 2/METAL HEATSINK
0.020(0.5)
0.028(0.7)
0.028(0.7)
0.012(0.3)
0.197(5.0)
0.185(4.7)
LEAD 1
0.628(16.0)
0.592(15.0)
NEW PRODUCT NEW PRODUCT NEW PRODUCT
PA
TENTED
*
*
Patent #Õs, 4,980,315,
5,166,769,
5,278,095
DO-218
0
25
50
75
100
125
150
175
200
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0.35
0.45
0.55
0.65
0.75
0.85
0.95
0.01
0.1
1
10
100
0
5
10
15
20
25
30
35
40
0
50
100
150
0.01
0.1
1
10
100
0.01
0.1
1
10
100
5
20
35
50
65
80
95
0.0001
0.001
0.01
0.1
1
10
100
25
50
75
100
125
150
0
2,000
3,000
5,000
6,000
175
1,000
4,000
10
100
1,000
10,000
RATINGS AND CHARACTERISTIC CURVES SM6A27
FIG. 1 - POWER DERATING CURVE
FIG. 3 - PULSE WAVEFORM
POWER DISSIP
A
TION, W
A
TTS
CASE TEMPERATURE, ¡C
FIG. 2 - TYPICAL INSTANTANEOUS FORWARD
CHARACTERISTICS
INST
ANT
ANEOUS FOR
W
ARD CURRENT
,
AMPS
FORWARD VOLTAGE, VOLTS
175¡C
INPUT
PEAK PULSE CURRENT
%
t, TIME, ms
t
r
=10
ms
PEAK VALUE I
PP
10/1000
ms
T
A
=25¡C
PULSE WIDTH (t
d
) is
DEFINED as the POINT
WHERE the PEAK CURRENT
DECAYS to 50% of I
PP
FIG. 4 - REVERSE POWER CAPABILITY
REVERSE SURGE POWER, W
A
TTS
PULSE WIDTH (ms) - 1/2 I
PP
EXPONENTIAL WAVEFORM
FIG. 6 - TYPICAL REVERSE CHARACTERISTICS
FIG. 7 - TYPICAL TRANSIENT THERMAL IMPEDANCE
PERCENTAGE OF V
(BR)
, %
PULSE WIDTH, sec.
175¡C
FIG. 5 - LOAD DUMP POWER CHARACTERISTICS
(10ms EXPONENTIAL WAVEFORM)
LOAD DUMP
POWER, W
A
TTS
TRANSIENT
THERMAL
IMPEDANCE, ¡C/W
CASE TEMPERATURE, ¡C
R
QJC
R
QJA
25¡C
25¡C
t
d
HALF VALUE -
I
PP
2
INST
ANT
ANEOUS REVERS CUR-
RENT
, MICRO
AMPERES
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