P6SMB6.8AT3G Series,
SZP6SMB6.8AT3G Series
600 Watt Peak Power Zener
Transient Voltage
Suppressors
Unidirectional*
The SMB series is designed to protect voltage sensitive
components from high voltage, high energy transients. They have
excellent clamping capability, high surge capability, low zener
impedance and fast response time. The SMB series is supplied in
the
Littelfuse
exclusive, cost-effective,
highly
reliable
package and is ideally suited for use in communication
systems, automotive, numerical controls, process controls,
medical equipment, business machines, power supplies and many
other industrial/consumer applications.
Specification Features:
Littelfuse.com
PLASTIC SURFACE MOUNT
ZENER OVERVOLTAGE
TRANSIENT SUPPRESSORS
5.8−171 VOLTS
600 WATT PEAK POWER
•
•
•
•
•
•
•
•
•
SMB
CASE 403A
PLASTIC
Working Peak Reverse Voltage Range − 5.8 to 171 V
Standard Zener Breakdown Voltage Range − 6.8 to 200 V
Peak Power − 600 W @ 1 ms
ESD Rating of Class 3 (> 16 kV) per Human Body Model
Maximum Clamp Voltage @ Peak Pulse Current
Low Leakage < 5
mA
Above 10 V
UL 497B for Isolated Loop Circuit Protection
Response Time is Typically < 1 ns
SZ Prefix for Automotive and Other Applications Requiring Unique
Site and Control Change Requirements; AEC−Q101 Qualified and
PPAP Capable
•
These Devices are Pb−Free and are RoHS Compliant
Mechanical Characteristics:
CASE:
Void-free, transfer-molded, thermosetting plastic
FINISH:
All external surfaces are corrosion resistant and leads are
Cathode
Anode
MARKING DIAGRAM
AYWW
xx
G
G
A
Y
WW
xx
G
= Assembly Location
= Year
= Work Week
= Device Code (Refer to page 3)
= Pb−Free Package
readily solderable
MAXIMUM CASE TEMPERATURE FOR SOLDERING PURPOSES:
(Note: Microdot may be in either location)
260°C for 10 Seconds
LEADS:
Modified L−Bend providing more contact area to bond pads
POLARITY:
Cathode indicated by polarity band
MOUNTING POSITION:
Any
ORDERING INFORMATION
Device
P6SMBxxxAT3G
SZP6SMBxxxAT3G
Package
SMB
(Pb−Free)
SMB
(Pb−Free)
Shipping
2,500 /
Tape & Reel
2,500 /
Tape & Reel
*Please see P6SMB11CAT3 to P6SMB91CAT3 for Bidirectional devices.
Specifications subject to change without notice.
© 2016 Littelfuse, Inc.
September 19, 2016 − Rev.
14
1
Publication Order Number:
P6SMB6.8AT3/D
P6SMB6.8AT3G Series, SZP6SMB6.8AT3G Series
MAXIMUM RATINGS
Rating
Peak Power Dissipation (Note 1) @ T
L
= 25°C, Pulse Width = 1 ms
DC Power Dissipation @ T
L
= 75°C Measured Zero Lead Length (Note 2)
Derate Above 75°C
Thermal Resistance from Junction−to−Lead
DC Power Dissipation (Note 3) @ T
A
= 25°C
Derate Above 25°C
Thermal Resistance from Junction−to−Ambient
Forward Surge Current (Note 4) @ T
A
= 25°C
Operating and Storage Temperature Range
Symbol
P
PK
P
D
R
qJL
P
D
R
qJA
I
FSM
T
J
, T
stg
Value
600
3.0
40
25
0.55
4.4
226
100
−65 to +150
Unit
W
W
mW/°C
°C/W
W
mW/°C
°C/W
A
°C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. 10 X 1000
ms,
non−repetitive
2. 1″ square copper pad, FR−4 board
3. FR−4 board, using Littelfuse minimum recommended footprint, as shown in 403A case outline dimensions spec.
4. 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, duty cycle = 4 pulses per minute maximum.
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise noted, V
F
= 3.5 V Max. @ I
F
(Note 4) = 30 A, V
F
= 1.3 V Max. @ I
F
(Note 4) = 3 A) (Note 5)
Symbol
I
PP
V
C
V
RWM
I
R
V
BR
I
T
QV
BR
I
F
V
F
Parameter
Maximum Reverse Peak Pulse Current
Clamping Voltage @ I
PP
Working Peak Reverse Voltage
Maximum Reverse Leakage Current @ V
RWM
Breakdown Voltage @ I
T
Test Current
Maximum Temperature Coefficient of V
BR
Forward Current
Forward Voltage @ I
F
I
PP
V
C
V
BR
V
RWM
V
I
F
I
I
R
V
F
I
T
5. 1/2 sine wave or equivalent, PW = 8.3 ms, non−repetitive
duty cycle
Uni−Directional TVS
Specifications subject to change without notice.
© 2016 Littelfuse, Inc.
September 19, 2016 − Rev.
14
2
Publication Order Number:
P6SMB6.8AT3/D
P6SMB6.8AT3G Series, SZP6SMB6.8AT3G Series
ELECTRICAL CHARACTERISTICS
V
RWM
(Note 6)
V
5.8
6.4
7.02
7.78
8.55
10.2
11.1
12.8
13.6
15.3
17.1
18.8
20.5
23.1
25.6
28.2
30.8
33.3
36.8
40.2
43.6
47.8
53
58.1
64.1
77.8
85.5
102
111
128
136
154
I
R
@
V
RWM
mA
1000
500
200
50
10
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
Breakdown Voltage
V
BR
V
(Note 7)
Min
6.45
7.13
7.79
8.65
9.5
11.4
12.4
14.3
15.2
17.1
19
20.9
22.8
25.7
28.5
31.4
34.2
37.1
40.9
44.7
48.5
53.2
58.9
64.6
71.3
86.5
95
114
124
143
152
171
Nom
6.8
7.51
8.2
9.1
10
12
13.05
15.05
16
18
20
22
24
27.05
30
33.05
36
39.05
43.05
47.05
51.05
56
62
68
75.05
91
100
120
130.5
150.5
160
180
Max
7.14
7.88
8.61
9.55
10.5
12.6
13.7
15.8
16.8
18.9
21
23.1
25.2
28.4
31.5
34.7
37.8
41
45.2
49.4
53.6
58.8
65.1
71.4
78.8
95.5
105
126
137
158
168
189
@ I
T
mA
10
10
10
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
V
C
@ I
PP
(Note 8)
V
C
V
10.5
11.3
12.1
13.4
14.5
16.7
18.2
21.2
22.5
25.2
27.7
30.6
33.2
37.5
41.4
45.7
49.9
53.9
59.3
64.8
70.1
77
85
92
103
125
137
165
179
207
219
246
I
PP
A
57
53
50
45
41
36
33
28
27
24
22
20
18
16
14.4
13.2
12
11.2
10.1
9.3
8.6
7.8
7.1
6.5
5.8
4.8
4.4
3.6
3.3
2.9
2.7
2.4
QV
BR
%/°C
0.057
0.061
0.065
0.068
0.073
0.078
0.081
0.084
0.086
0.088
0.09
0.092
0.094
0.096
0.097
0.098
0.099
0.1
0.101
0.101
0.102
0.103
0.104
0.104
0.105
0.106
0.106
0.107
0.107
0.108
0.108
0.108
C
typ
(Note 9)
pF
2380
2180
2015
1835
1690
1435
1335
1175
1110
1000
910
835
775
700
635
585
540
500
460
425
395
365
335
305
280
235
215
185
170
150
140
130
Device*
P6SMB6.8AT3G
P6SMB7.5AT3G
P6SMB8.2AT3G
P6SMB9.1AT3G
P6SMB10AT3G
P6SMB12AT3G
P6SMB13AT3G
P6SMB15AT3G
P6SMB16AT3G
P6SMB18AT3G
P6SMB20AT3G
P6SMB22AT3G
P6SMB24AT3G
P6SMB27AT3G
P6SMB30AT3G
P6SMB33AT3G
P6SMB36AT3G
P6SMB39AT3G
P6SMB43AT3G
P6SMB47AT3G
P6SMB51AT3G
P6SMB56AT3G
P6SMB62AT3G
P6SMB68AT3G
P6SMB75AT3G
P6SMB91AT3G
P6SMB100AT3G
P6SMB120AT3G
P6SMB130AT3G
P6SMB150AT3G
P6SMB160AT3G
P6SMB180AT3G
Device
Marking
6V8A
7V5A
8V2A
9V1A
10A
12A
13A
15A
16A
18A
20A
22A
24A
27A
30A
33A
36A
39A
43A
47A
51A
56A
62A
68A
75A
91A
100A
120A
130A
150A
160A
180A
P6SMB200AT3G
200A
171
5
190
200
210
1
274
2.2
0.108
115
6. A transient suppressor is normally selected according to the working peak reverse voltage (V
RWM
), which should be equal to or greater than
the DC or continuous peak operating voltage level.
7. V
BR
measured at pulse test current I
T
at an ambient temperature of 25°C.
8. Surge current waveform per Figure 2 and derate per Figure 3.
9. Bias Voltage = 0 V, F = 1 MHz, T
J
= 25°C
* Include SZ-prefix devices where applicable.
Specifications subject to change without notice.
© 2016 Littelfuse, Inc.
September 19, 2016 − Rev.
14
3
Publication Order Number:
P6SMB6.8AT3/D
P6SMB6.8AT3G Series, SZP6SMB6.8AT3G Series
100
NONREPETITIVE
PULSE WAVEFORM
SHOWN IN FIGURE 2
10
t
r
≤
10
ms
100
VALUE (%)
PEAK VALUE - I
PP
I
HALF VALUE -
PP
2
PULSE WIDTH (t
P
) IS DEFINED AS
THAT POINT WHERE THE PEAK
CURRENT DECAYS TO 50% OF
I
PP
.
PP, PEAK POWER (kW)
1
50
t
P
0.1
0.1
ms
1
ms
10
ms
100
ms
1 ms
10 ms
0
0
1
2
t, TIME (ms)
3
4
5
t
P
, PULSE WIDTH
Figure 1. Pulse Rating Curve
Figure 2. Pulse Waveform
160
PEAK PULSE DERATING IN % OF
PEAK POWER OR CURRENT @ T = 25
°
C
A
140
10,000
P6SMB6.8AT3G
C, CAPACITANCE (pF)
1000
P6SMB18AT3G
P6SMB51AT3G
120
100
80
60
40
20
0
0
25
50
75
100
125
150
100
10
T
J
= 25°C
f = 1 MHz
1
10
P6SMB200AT3G
1
100
1000
T
A
, AMBIENT TEMPERATURE (°C)
BIAS VOLTAGE (VOLTS)
Figure 3. Pulse Derating Curve
Figure 4. Typical Junction Capacitance vs.
Bias Voltage
TYPICAL PROTECTION CIRCUIT
Z
in
V
in
LOAD
V
L
Specifications subject to change without notice.
© 2016 Littelfuse, Inc.
September 19, 2016 − Rev.
14
4
Publication Order Number:
P6SMB6.8AT3/D
P6SMB6.8AT3G Series, SZP6SMB6.8AT3G Series
APPLICATION NOTES
Response Time
In most applications, the transient suppressor device is
placed in parallel with the equipment or component to be
protected. In this situation, there is a time delay associated
with the capacitance of the device and an overshoot
condition associated with the inductance of the device and
the inductance of the connection method. The capacitive
effect is of minor importance in the parallel protection
scheme because it only produces a time delay in the
transition from the operating voltage to the clamp voltage as
shown in Figure 5.
The inductive effects in the device are due to actual
turn-on time (time required for the device to go from zero
current to full current) and lead inductance. This inductive
effect produces an overshoot in the voltage across the
equipment or component being protected as shown in
Figure 6. Minimizing this overshoot is very important in the
application, since the main purpose for adding a transient
suppressor is to clamp voltage spikes. The SMB series have
a very good response time, typically < 1 ns and negligible
inductance. However, external inductive effects could
produce unacceptable overshoot. Proper circuit layout,
minimum lead lengths and placing the suppressor device as
close as possible to the equipment or components to be
protected will minimize this overshoot.
Some input impedance represented by Z
in
is essential to
prevent overstress of the protection device. This impedance
should be as high as possible, without restricting the circuit
operation.
Duty Cycle Derating
The data of Figure 1 applies for non-repetitive conditions
and at a lead temperature of 25°C. If the duty cycle increases,
the peak power must be reduced as indicated by the curves
of Figure 7. Average power must be derated as the lead or
ambient temperature rises above 25°C. The average power
derating curve normally given on data sheets may be
normalized and used for this purpose.
At first glance the derating curves of Figure 7 appear to be
in error as the 10 ms pulse has a higher derating factor than
the 10
ms
pulse. However, when the derating factor for a
given pulse of Figure 7 is multiplied by the peak power value
of Figure 1 for the same pulse, the results follow the
expected trend.
V
in
(TRANSIENT)
V
L
V
V
in
(TRANSIENT)
V
L
V
OVERSHOOT DUE TO
INDUCTIVE EFFECTS
V
in
t
d
t
D
= TIME DELAY DUE TO CAPACITIVE EFFECT
t
t
Figure 5.
1
0.7
0.5
DERATING FACTOR
0.3
0.2
0.1
0.07
0.05
0.03
0.02
0.01
10
ms
0.1 0.2
0.5
1
2
5
10
D, DUTY CYCLE (%)
20
Figure 6.
PULSE WIDTH
10 ms
1 ms
100
ms
50 100
Figure 7. Typical Derating Factor for Duty Cycle
Specifications subject to change without notice.
© 2016 Littelfuse, Inc.
September 19, 2016 − Rev.
14
5
Publication Order Number:
P6SMB6.8AT3/D
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