NEW PRODUCT
NEW PRODUCT
NEW PRODUCT
SM8A27 TRANSIENT SUPPRESSOR
SURFACE MOUNT AUTOMOTIVE TRANSIENT VOLTAGE SUPPRESSOR
Zener Voltage -
27.0 Volts
*
D
E
DO-218
0.628(16.0)
0.592(15.0)
0.539(13.7)
0.524(13.3)
Peak Pulse Current -
130.0 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
AT
P
EN
T
0.116(3.0)
0.093(2.4)
0.413(10.5) 0.342(8.7)
0.374(9.5) 0.327(8.3)
0.366(9.3)
0.343(8.7)
0.406(10.3)
0.382(9.7)
LEAD 1
0.197(5.0)
0.185(4.7)
0.028(0.7)
0.020(0.5)
0.098(2.5)
0.059(1.5)
0.138(3.5)
0.098(2.5)
MECHANICAL DATA
0.028(0.7)
0.012(0.3)
LEAD 2/METAL HEATSINK
*
Patent #Õs, 4,980,315,
5,166,769,
5,278,095
Dimensions in inches
and
(millimeters)
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
SM8A27
UNITS
Steady state power dissipation
Non-repetitive peak reverse surge current for 10ms/10ms
exponentially decaying waveform
Maximum working peak stand-off voltage
Minimum reverse zener voltage at 10mA
Maximum reverse zener voltage at 10mA
Maximum zener voltage temperature coefficient at I
Z
=10mA
Peak forward surge current, 8.3ms single half sine-wave
Maximum clamping voltage for 10ms/10ms exponentially
decaying waveform at I
PP
=75A
Maximum instantaneous forward voltage at 6.0A
(NOTE 1)
Maximum reverse leakage current at rated V
WM
Maximum thermal resistance junction to case
Operating junction and storage temperature range
NOTE:
(1) Measured on a 300ms square pulse width
NOTICE:
Advanced product information is subject to change without notice
P
D
I
RSM
V
WM
V
Z
V
Z
Vztc
I
FSM
V
C
V
F
I
R
R
QJC
T
J
, T
STG
8.0
130.0
22.0
24.0
30.0
36.0
700.0
40.0
0.98
1.0
50.0
0.90
-55 to +175
Watts
Amps
Volts
Volts
Volts
m V/¡C
Amps
Volts
Volts
mA
¡C/W
¡C
T
J
=25¡C
T
J
=175¡C
2/23/99
RATINGS AND CHARACTERISTIC CURVES SM8A27
FIG. 1 - POWER DERATING CURVE
INSTANTANEOUS FORWARD CURRENT,
AMPS
8.0
POWER DISSIPATION, WATTS
100
FIG. 2 - TYPICAL INSTANTANEOUS FORWARD
CHARACTERISTICS
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
0
25
50
75
100
125
150
175
200
175¡C
25¡C
10
1
0.1
0.01
0.35
0.45
0.55
0.65
0.75
0.85
0.95
CASE TEMPERATURE, ¡C
FIG. 3 - PULSE WAVEFORM
FORWARD VOLTAGE, VOLTS
10,000
REVERSE SURGE POWER, WATTS
FIG. 4 - REVERSE POWER CAPABILITY
150
INPUT PEAK PULSE CURRENT %
T
A
=25¡C
PULSE WIDTH (t
d
) is
DEFINED as the POINT
WHERE the PEAK CURRENT
DECAYS to 50% of I
PP
t
r
=10ms
100
PEAK VALUE I
PP
50
I
HALF VALUE -
PP
2
10/1000ms
15
20
25
30
35
t, TIME, ms
FIG. 5 - LOAD DUMP POWER CHARACTERISTICS
(10ms EXPONENTIAL WAVEFORM)
6,000
LOAD DUMP POWER, WATTS
0
t
d
0
5
10
40
1,000
10
100
PULSE WIDTH (ms) - 1/2 I
PP
EXPONENTIAL WAVEFORM
FIG. 6 - TYPICAL REVERSE CHARACTERISTICS
100
5,000
4,000
3,000
2,000
1,000
0
25
50
75
100
125
150
175
CASE TEMPERATURE, ¡C
INSTANTANEOUS REVERS CUR-
RENT, MICRO AMPERES
10
175¡C
1
0.1
0.01
25¡C
0.001
0.0001
5
20
65
50
35
PERCENTAGE OF V
(BR)
, %
80
95
100
TRANSIENT THERMAL IMPEDANCE, ¡C/W
FIG. 7 - TYPICAL TRANSIENT THERMAL IMPEDANCE
R
QJA
10
1
R
QJC
0.1
0.01
0.01
0.1
1
PULSE WIDTH, sec.
10
100
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
