SM8A27
New Product
Vishay Semiconductors
formerly General Semiconductor
Surface Mount Automotive Transient Voltage Suppressor
DO-218AB
0.628(16.0)
0.592(15.0)
0.539(13.7)
0.524(13.3)
Zener Voltage
27V
Peak Pulse Current
130A(10/10,000µs)
Peak Pulse Power
6600W (10/1,000µs)
0.116(3.0)
0.093(2.4)
d*
nte
ate
P
0.413(10.5)
0.374(9.5)
Mounting Pad Layout
0.091(2.3)
0.067(1.7)
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)
Dimensions in
inches and (millimeters)
0.366(9.3)
0.343(8.7)
0.606(15.4)
0.583(14.8)
0.150(3.8)
0.126(3.2)
LEAD 1
0.197(5.0)
0.185(4.7)
0.138(3.5)
0.098(2.5)
0.016 (0.4) Min.
0.028(0.7)
0.020(0.5)
0.098(2.5)
0.059(1.5)
*
Patent #’s:
4,980,315
5,166,769
5,278,095
LEAD 2/METAL HEATSINK
Features
• Ideally suited for load dump protection
• Plastic package has Underwriters Laboratory
Flammability Classification 94V-0
• High temperature stability due to unique oxide passiva-
tion and patented PAR
®
construction
• Integrally molded heatsink provides a very low thermal
resistance for maximum heat dissipation
• Low leakage current at T
J
= 175°C
• High temperature soldering guaranteed:
260°C for 10 seconds at terminals
• Meets ISO7637-2 surge spec.
• Low forward voltage drop
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 oz., 2.58 g
Packaging codes/options:
2D/750 per 13" Reel (16mm Tape),
anode towards sprocket hole, 4.5K/box
2E/750 per 13" Reel (16mm Tape),
cathode towards sprocket hole, 4.5K/box
Maximum Ratings and Thermal Characteristics
(T
C
= 25°C unless otherwise noted)
Parameter
Steady state power dissipation
Non-repetitive peak reverse surge current for 10µs/10ms
exponentially decaying waveform
Maximum working stand-off voltage
Peak forward surge current 8.3ms single half sine-wave
Typical thermal resistance junction to case
Operating junction and storage temperature range
Document Number 88386
01-Aug-02
Symbol
P
D
I
RSM
V
WM
I
FSM
R
θJC
T
J
, T
STG
Value
8.0
130
22.0
700
0.90
–55 to +175
Unit
W
A
V
A
°C/W
°C
www.vishay.com
1
SM8A27
Vishay Semiconductors
formerly General Semiconductor
Electrical Characteristics
(T
C
= 25°C unless otherwise noted)
Parameter
Reverse zener voltage at 10mA
Zener voltage temperature coefficient at I
Z
= 10mA
Clamping voltage for 10µs/10ms exponentially
decaying waveform at I
PP
= 75A
Instantaneous forward voltage
(1)
Reverse leakage current at rated V
WM
Notes:
(1) Measured on a 300µs square pulse width
Symbol
V
Z
V
ZTC
V
C
V
F
I
R
Min
24.0
–
–
–
–
–
–
Typ
–
–
–
–
0.93
–
–
Max
30.0
36
40.0
0.98
–
1.0
50.0
Unit
V
mV/°C
V
V
µA
at 6.0A
at 100A
T
J
= 25°C
T
J
= 175°C
Ratings and Characteristic Curves
T
A
=25
O
C unless otherwise noted.
Power Derating Curve
8.0
6,000
Load Dump Power Characteristics
(10ms Exponential Waveform)
5,000
Power Dissipation (W)
6.0
Load Dump Power (W)
4,000
3,000
2,000
4.0
2.0
1,000
0
0
50
100
150
200
0
25
50
75
100
125
150
175
Case Temperature (°C)
Case Temperature (°C)
Pulse Waveform
150
T
A
= 25°C
Pulse width (t
d
) is defined as
the point where the peak
current decays to 50% of I
PP
10,000
Reverse Power Capability
Input Peak Pulse Current %
t
r
= 10µs
100
Peak Value I
PP
50
Half Value –
I
PP
2
0
0
t
d
10
20
30
40
Reverse Surge Power (W)
1,000
10
100
Time, ms (t)
www.vishay.com
2
Pulse Width (ms) – 1/2 I
PP
Exponential Waveform
Document Number 88386
01-Aug-02
SM8A27
Vishay Semiconductors
formerly General Semiconductor
Ratings and
Characteristic Curves
(T
A
= 25°C unless otherwise noted)
Typical Instantaneous
Forward Characteristics
I
F
– Instantaneous Reverse Current (µA)
I
F
– Instantaneous Forward Current (A)
100
100
Typical Reverse Characteristics
10
T
J
= 175°C
1.0
0.1
0.01
T
J
= 25°C
10
–3
10
–4
5
20
35
50
65
80
95
10
T
J
= 150°C
1.0
T
J
= 25°C
0.1
0.01
0.35
0.45
0.55
0.65
0.75
0.85
0.95
Instantaneous Forward Voltage (V)
Percentage of V
(BR)
(%)
Typical Transient Thermal Impedance
100
Transient Thermal Impedance (°C/W)
R
ΘJA
10
1
R
ΘJC
0.1
0.01
0.01
0.1
1
10
100
t – Pulse Width (sec.)
Document Number 88386
01-Aug-02
www.vishay.com
3
Discrete Device
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