Semiconductor Components Industries, LLC, 2001
May, 2001 Rev. 4
1
Publication Order Number:
1SMB10CAT3/D
1SMB10CAT3 Series
600 Watt Peak Power Zener
Transient Voltage Suppressors
Bidirectional*
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
ON Semiconductor's exclusive, cost-effective, highly reliable
Surmetic
t 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:
Working Peak Reverse Voltage Range 10 V to 78 V
Standard Zener Breakdown Voltage Range 11.7 V to 91.3 V
Peak Power 600 Watts @ 1 ms
ESD Rating of Class 3 (> 16 KV) per Human Body Model
Maximum Clamp Voltage @ Peak Pulse Current
Low Leakage < 5
A Above 10 V
UL 497B for Isolated Loop Circuit Protection
Response Time is Typically < 1 ns
Mechanical Characteristics:
CASE:
Void-free, transfer-molded, thermosetting plastic
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 LBend providing more contact area to bond pads
POLARITY:
Polarity band will not be indicated
MOUNTING POSITION:
Any
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Peak Power Dissipation (Note 1.)
@ T
L
= 25
C, Pulse Width = 1 ms
P
PK
600
W
DC Power Dissipation @ T
L
= 75
C
Measured Zero Lead Length (Note 2.)
Derate Above 75
C
Thermal Resistance from Junction to Lead
P
D
R
q
JL
3.0
40
25
W
mW/
C
C/W
DC Power Dissipation (Note 3.) @ T
A
= 25
C
Derate Above 25
C
Thermal Resistance from Junction
to Ambient
P
D
R
q
JA
0.55
4.4
226
W
mW/
C
C/W
Operating and Storage
Temperature Range
T
J
, T
stg
65 to
+150
C
1. 10 X 1000
m
s, nonrepetitive
2. 1
square copper pad, FR4 board
3. FR4 board, using ON Semiconductor minimum recommended footprint, as
shown in 403A case outline dimensions spec.
*Please see 1SMB5.0AT3 to 1SMB170AT3 for Unidirectional devices.
PLASTIC SURFACE MOUNT
ZENER OVERVOLTAGE
TRANSIENT SUPPRESSORS
1078 VOLTS
600 WATT PEAK POWER
Devices listed in
bold, italic are ON Semiconductor
Preferred devices. Preferred devices are recommended
choices for future use and best overall value.
Device
{
Package
Shipping
ORDERING INFORMATION
1SMBxxCAT3
SMB
2500/Tape & Reel
SMB
CASE 403A
PLASTIC
http://onsemi.com
Y
= Year
WW
= Work Week
xxC
= Specific Device Code
=
(See Table Next Page)
YWW
xxC
MARKING DIAGRAM
The "T3" suffix refers to a 13 inch reel.
BiDirectional TVS
I
PP
I
PP
V
I
I
R
I
T
I
T
I
R
V
RWM
V
C
V
BR
V
RWM
V
C
V
BR
1SMB10CAT3 Series
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2
ELECTRICAL CHARACTERISTICS
(T
A
= 25
C unless otherwise noted)
Symbol
Parameter
I
PP
Maximum Reverse Peak Pulse Current
V
C
Clamping Voltage @ I
PP
V
RWM
Working Peak Reverse Voltage
I
R
Maximum Reverse Leakage Current @ V
RWM
V
BR
Breakdown Voltage @ I
T
I
T
Test Current
ELECTRICAL CHARACTERISTICS
(Devices listed in bold, italic are ON Semiconductor Preferred devices.)
V
RWM
Breakdown Voltage
V
C
@ I
PP
(Note 6.)
Device
V
RWM
(Note 4.)
I
R
@ V
RWM
V
BR
(Note 5.)
Volts
@ I
T
V
C
I
PP
Device
Device
Marking
Volts
A
Min
Nom
Max
mA
Volts
Amps
1SMB10CAT3
1SMB11CAT3
1SMB12CAT3
1SMB13CAT3
KXC
KZC
LEC
LGC
10
11
12
13
5.0
5.0
5.0
5.0
11.1
12.2
13.3
14.4
11.69
12.84
14.00
15.16
12.27
13.5
14.7
15.9
1.0
1.0
1.0
1.0
17.0
18.2
19.9
21.5
35.3
33.0
30.2
27.9
1SMB14CAT3
1SMB15CAT3
1SMB16CAT3
1SMB17CAT3
LKC
LMC
LPC
LRC
14
15
16
17
5.0
5.0
5.0
5.0
15.6
16.7
17.8
18.9
16.42
17.58
18.74
19.90
17.2
18.5
19.7
20.9
1.0
1.0
1.0
1.0
23.2
24.4
26.0
27.6
25.8
24.0
23.1
21.7
1SMB18CAT3
1SMB20CAT3
1SMB22CAT3
1SMB24CAT3
LTC
LVC
LXC
LZC
18
20
22
24
5.0
5.0
5.0
5.0
20.0
22.2
24.4
26.7
21.06
23.37
25.69
28.11
22.1
24.5
27.0
29.5
1.0
1.0
1.0
1.0
29.2
32.4
35.5
38.9
20.5
18.5
16.9
15.4
1SMB26CAT3
1SMB28CAT3
1SMB30CAT3
1SMB33CAT3
MEC
MGC
MKC
MMC
26
28
30
33
5.0
5.0
5.0
5.0
28.9
31.1
33.3
36.7
30.42
32.74
35.06
38.63
31.9
34.4
36.8
40.6
1.0
1.0
1.0
1.0
42.1
45.4
48.4
53.3
14.2
13.2
12.4
11.3
1SMB36CAT3
1SMB40CAT3
1SMB43CAT3
1SMB45CAT3
MPC
MRC
MTC
MVC
36
40
43
45
5.0
5.0
5.0
5.0
40.0
44.4
47.8
50.0
42.11
46.74
50.32
52.63
44.2
49.1
52.8
55.3
1.0
1.0
1.0
1.0
58.1
64.5
69.4
72.2
10.3
9.3
8.6
8.3
1SMB48CAT3
1SMB51CAT3
1SMB54CAT3
1SMB58CAT3
MXC
MZC
NEC
NGC
48
51
54
58
5.0
5.0
5.0
5.0
53.3
56.7
60.0
64.4
56.11
59.69
63.16
67.79
58.9
62.7
66.32
71.18
1.0
1.0
1.0
1.0
77.4
82.4
87.1
93.6
7.7
7.3
6.9
6.4
1SMB60CAT3
1SMB64CAT3
1SMB70CAT3
1SMB75CAT3
NKC
NMC
NPC
NRC
60
64
70
75
5.0
5.0
5.0
5.0
66.7
71.1
77.8
83.3
70.21
74.84
81.90
91.65
73.72
78.58
85.99
92.07
1.0
1.0
1.0
1.0
96.8
103
113
121
6.2
5.8
5.3
4.9
1SMB78CAT3
NTC
78
5.0
86.7
91.26
95.83
1.0
126
4.7
4. 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.
5. V
BR
measured at pulse test current I
T
at an ambient temperature of 25
C.
6. Surge current waveform per Figure 2 and derate per Figure 3 of the General Data 600 Watt at the beginning of this group.
1SMB10CAT3 Series
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3
NONREPETITIVE
PULSE WAVEFORM
SHOWN IN FIGURE 2
t
P
, PULSE WIDTH
1
10
100
0.1
s
1
s
10
s
100
s
1 ms
10 ms
0.1
Figure 1. Pulse Rating Curve
0
1
2
3
4
0
50
100
t, TIME (ms)
V
ALUE (%)
HALF VALUE - I
PP
2
PEAK VALUE - I
PP
t
r
10
s
Figure 2. Pulse Waveform
TYPICAL PROTECTION CIRCUIT
V
in
V
L
Z
in
LOAD
Figure 3. Pulse Derating Curve
PEAK PULSE DERA
TING IN % OF
PEAK POWER OR CURRENT
@
T A
= 25
C
100
80
60
40
20
0
0
25
50
75
100
125
150
T
A
, AMBIENT TEMPERATURE (
C)
120
140
160
t
P
PULSE WIDTH (t
P
) IS DEFINED
AS THAT POINT WHERE THE PEAK
CURRENT DECAYS TO 50% OF I
PP
.
P
PK
, PEAK POWER (kW)
1SMB10CAT3 Series
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4
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 4.
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 5. 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 6. 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 6 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 6 is multiplied by the peak power value
of Figure 1 for the same pulse, the results follow the
expected trend.
1SMB10CAT3 Series
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5
V
L
V
V
in
V
in
(TRANSIENT)
V
L
t
d
V
V
in
(TRANSIENT)
OVERSHOOT DUE TO
INDUCTIVE EFFECTS
t
D
= TIME DELAY DUE TO CAPACITIVE EFFECT
t
t
Figure 4.
Figure 5.
Figure 6. Typical Derating Factor for Duty Cycle
DERA
TING F
ACT
OR
1 ms
10
s
1
0.7
0.5
0.3
0.05
0.1
0.2
0.01
0.02
0.03
0.07
100
s
0.1 0.2
0.5
2
5
10
50
1
20
100
D, DUTY CYCLE (%)
PULSE WIDTH
10 ms
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
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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