1.5SMC6.8AT3 Series
1500 Watt Peak Power
Zener Transient Voltage
Suppressors
Unidirectional*
The SMC 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 SMC series is supplied in
ON Semiconductor’s exclusive, cost-effective, highly reliable
Surmetic 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.
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PLASTIC SURFACE MOUNT
ZENER OVERVOLTAGE
TRANSIENT SUPPRESSORS
5.8 − 78 VOLTS
1500 WATT PEAK POWER
Specification Features:
• Working Peak Reverse Voltage Range − 5.8 to 77.8 V
• Standard Zener Breakdown Voltage Range − 6.8 to 91 V
• Peak Power − 1500 Watts @ 1.0 ms
• ESD Rating of Class 3 (>16 kV) per Human Body Model
• Maximum Clamp Voltage @ Peak Pulse Current
• Low Leakage < 5.0 A Above 10 V
• UL 497B for Isolated Loop Circuit Protection
• Maximum Temperature Coefficient Specified
• Response Time is Typically < 1.0 ns
• Pb−Free Packages are Available
Mechanical Characteristics:
Void-free, transfer-molded, thermosetting plastic
CASE:
FINISH: All external surfaces are corrosion resistant and leads are
readily solderable
MAXIMUM CASE TEMPERATURE FOR SOLDERING PURPOSES:
260°C for 10 Seconds
LEADS: Modified L−Bend providing more contact area to bond pads
POLARITY: Cathode indicated by molded polarity notch
MOUNTING POSITION: Any
MAXIMUM RATINGS
Please See the Table on the Following Page
Cathode Anode
SMC
CASE 403
PLASTIC
MARKING DIAGRAM
YWW
xxxA
Y = Year
WW = Work Week
xxxA = Specific Device Code
ORDERING INFORMATION
Device** Package Shipping
1.5SMCxxxAT3 SMC 2500/Tape & Reel
1.5SMCxxxAT3G SMC
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
= (See Table on Page 3)
†
2500/Tape & Reel
(Pb−Free)
Semiconductor Components Industries, LLC, 2004
April, 2004 − Rev. 5
*Bidirectional devices will not be available in this se-
ries.
**The “T3” suffix refers to a 13 inch reel.
Individual devices are listed on page 3 of this data sheet.
1 Publication Order Number:
1.5SMC6.8AT3/D
1.5SMC6.8AT3 Series
MAXIMUM RATINGS
Rating Symbol Value Unit
Peak Power Dissipation (Note 1) @ TL = 25°C, Pulse Width = 1 ms P
DC Power Dissipation @ TL = 75°C
Measured Zero Lead Length (Note 2)
PK
P
D
Derate Above 75°C
R
P
R
FSM
JL
D
JA
stg
Thermal Resistance from Junction−to−Lead
DC Power Dissipation (Note 3) @ TA = 25°C
Derate Above 25°C
Thermal Resistance from Junction−to−Ambient
Forward Surge Current (Note 4) @ TA = 25°C I
Operating and Storage Temperature Range TJ, T
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously . If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. 10 X 1000 s, non−repetitive
2. 1″ square copper pad, FR−4 board
3. FR−4 board, using ON Semiconductor minimum recommended footprint, as shown in 403 case outline dimensions spec.
4. 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, duty cycle = 4 pulses per minute maximum.
1500 W
4.0
54.6
18.3
0.75
6.1
165
W
mW/°C
°C/W
W
mW/°C
°C/W
200 A
−65 to +150 °C
ELECTRICAL CHARACTERISTICS (T
otherwise noted, V
Symbol
I
PP
V
C
V
RWM
I
R
V
BR
I
T
V
BR
I
F
V
F
5. 1/2 sine wave or equivalent, PW = 8.3 ms
non−repetitive duty cycle
= 3.5 V Max. @ IF (Note 5) = 100 A)
F
Parameter
Maximum Reverse Peak Pulse Current
Clamping Voltage @ I
PP
Working Peak Reverse Voltage
Maximum Reverse Leakage Current @ V
Breakdown Voltage @ I
T
Test Current
Maximum Temperature Coefficient of V
Forward Current
Forward Voltage @ I
F
= 25°C unless
A
RWM
BR
VCV
V
RWM
BR
Uni−Directional TVS
I
I
F
I
V
R
F
I
T
I
PP
V
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2
1.5SMC6.8AT3 Series
V
Devi
ELECTRICAL CHARACTERISTICS (Devices listed in bold, italic are ON Semiconductor Preferred devices.)
RWM
(Note 6)
ce
Device
1.5SMC6.8AT3
1.5SMC7.5AT3
1.5SMC8.2AT3
1.5SMC9.1AT3
1.5SMC10AT3
1.5SMC11AT3
1.5SMC12AT3
1.5SMC13AT3
1.5SMC15AT3
1.5SMC15AT3G
1.5SMC16AT3
1.5SMC18AT3
1.5SMC20AT3
1.5SMC22AT3
1.5SMC24AT3
1.5SMC27AT3
1.5SMC30AT3
1.5SMC33AT3
1.5SMC36AT3
1.5SMC39AT3
1.5SMC43AT3
1.5SMC47AT3
1.5SMC51AT3
1.5SMC56AT3
1.5SMC62AT3
1.5SMC62AT3G
1.5SMC68AT3
1.5SMC75AT3
1.5SMC82AT3
1.5SMC91AT3
NOTE: Devices listed in
*The “G” suffix indicates Pb−Free package available.
6. A transient suppressor is normally selected according to the working peak reverse voltage (V
7. V
8. Surge current waveform per Figure 2 and derate per Figure 3 of the General Data − 1500 Watt at the beginning of this group.
use and best overall value.
the DC or continuous peak operating voltage level.
measured at pulse test current IT at an ambient temperature of 25°C.
BR
Marking
6V8A
7V5A
8V2A
9V1A
10A
11A
12A
13A
15A
15A
16A
18A
20A
22A
24A
27A
30A
33A
36A
39A
43A
47A
51A
56A
62A
68A
75A
82A
91A
bold, italic
Volts A Min Nom Max mA Volts Amps %/°C
5.8
6.4
7.02
7.78
8.55
9.4
10.2
11.1
12.8
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
53
58.1
64.1
70.1
77.8
are ON Semiconductor Preferred devices. Preferred devices are recommended choices for future
I
@ V
R
RWM
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
Breakdown Voltage VC @ IPP (Note 8)
V
Volts (Note 7) @ I
BR
6.45
7.13
7.79
8.65
9.5
10.5
11.4
12.4
14.3
14.3
15.2
17.1
20.9
22.8
25.7
28.5
31.4
34.2
37.1
40.9
44.7
48.5
53.2
58.9
58.9
64.6
71.3
77.9
86.5
19
6.8
7.5
8.2
9.1
10
11
12
13
15
15
16
18
20
22
24
27
30
33
36
39
43
47
51
56
62
62
68
75
82
91
7.14
7.88
8.61
9.55
10.5
11.6
12.6
13.7
15.8
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
65.1
71.4
78.8
86.1
95.5
T
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
V
C
10.5
11.3
12.1
13.4
14.5
15.6
16.7
18.2
21.2
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
85
92
103
113
125
), which should be equal to or greater than
RWM
I
PP
143
132
124
112
103
96
90
82
71
71
67
59.5
54
49
45
40
36
33
30
28
25.3
23.2
21.4
19.5
17.7
17.7
16.3
14.6
13.3
12
V
BR
0.057
0.061
0.065
0.068
0.073
0.075
0.078
0.081
0.084
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
0.104
0.105
0.105
0.106
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3
1.5SMC6.8AT3 Series
100
NONREPETITIVE
PULSE WAVEFORM
SHOWN IN FIGURE 2
10
, PEAK POWER (kW)
pk
P
1
0.1
s1 s10 s 100 s
, PULSE WIDTH
t
P
1 ms 10 ms
Figure 1. Pulse Rating Curve
160
140
= 25 C°
A
120
100
80
60
40
PEAK PULSE DERATING IN % OF
20
PEAK POWER OR CURRENT @ T
0
0 25 50 75 100 125 150
T
, AMBIENT TEMPERATURE (°C)
A
PULSE WIDTH (tP) IS DEFINED
t
≤ 10 s
r
100
VALUE (%)
50
0
PEAK VALUE − I
t
P
01234
AS THAT POINT WHERE THE PEAK
CURRENT DECAYS TO 50%
OF I
.
PP
PP
I
HALF VALUE −
t, TIME (ms)
PP
2
Figure 2. Pulse Waveform
1000
T
=25°C
L
500
t
=10s
P
200
100
50
20
10
5
, TEST CURRENT (AMPS)
T
I
2
1
0.3 0.5 0.7 1 2 3 5 7 10 20 30
VBR, INSTANTANEOUS INCREASE IN VBR ABOVE VBR (NOM) (VOLTS)
VBR(NOM)=6.8TO13V
20V
24V
43V
75V
120V
180V
Figure 3. Pulse Derating Curve
UL RECOGNITION
The entire series has Underwriters Laboratory
Recognition for the classification of protectors (QVGV2)
under the UL standard for safety 497B and File #116110.
Many competitors only have one or two devices recognized
or have recognition in a non-protective category. Some
competitors have no recognition at all. With the UL497B
recognition, our parts successfully passed several tests
Figure 4. Dynamic Impedance
including Strike Voltage Breakdown test, Endurance
Conditioning, Temperature test, Dielectric Voltage-Withstand
test, Discharge test and several more.
Whereas, some competitors have only passed a
flammability test for the package material, we have been
recognized for much more to be included in their Protector
category.
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4
1.5SMC6.8AT3 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 SMC series have
a very good response time, typically < 1.0 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
is essential to
in
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 s 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.
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5
1.5SMC6.8AT3 Series
TYPICAL PROTECTION CIRCUIT
Z
in
V
in
V
V
in
t
d
= TIME DELAY DUE TO CAPACITIVE EFFECT
t
D
Figure 5. Figure 6.
1
0.7
0.5
0.3
0.2
0.1
0.07
0.05
DERATING FACTOR
0.03
0.02
0.01
0.1 0.2 0.5 2 5 10 501 20 100
Vin (TRANSIENT)
V
L
LOAD
V
V
L
OVERSHOOT DUE TO
INDUCTIVE EFFECTS
t t
PULSE WIDTH
10 ms
1 ms
100 s
10 s
D, DUTY CYCLE (%)
Figure 7. Typical Derating Factor for Duty Cycle
V
(TRANSIENT)
in
V
L
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6
1.5SMC6.8AT3 Series
PACKAGE DIMENSIONS
SMC
CASE 403−03
ISSUE B
S
A
DB
C
J
PK
H
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. D DIMENSION SHALL BE MEASURED WITHIN
DIMENSION P.
DIM MIN MAX MIN MAX
A 0.260 0.280 6.60 7.11
B 0.220 0.240 5.59 6.10
C 0.075 0.095 1.90 2.41
D 0.115 0.121 2.92 3.07
H 0.0020 0.0060 0.051 0.152
J 0.006 0.012 0.15 0.30
K 0.030 0.050 0.76 1.27
P 0.020 REF 0.51 REF
S 0.305 0.320 7.75 8.13
MILLIMETERSINCHES
SOLDERING FOOTPRINT*
4.343
0.171
3.810
0.150
2.794
0.110
SCALE 4:1
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
mm
inches
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7
1.5SMC6.8AT3 Series
Surmetic is a trademark of Semiconductor Components Industries, LLC.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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For additional information, please contact your
local Sales Representative.
1.5SMC6.8AT3/D
8
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