January 2018
DocID3082 Rev 10
1/11
This is information on a product in full production.
www.st.com
SM6T
Transil™
Datasheet - production data
Features
Peak pulse power:
600 W (10/1000 μs)
4 kW (8/20 μs)
Stand-off voltage range: from 6.8 V to 220 V
Unidirectional and bidirectional types
Low leakage current:
0.2 μA at 25 °C
1 μA at 85 °C
Operating Tj max: 150 °C
High power capability at Tj max.:
515 W (10/1000 µs)
JEDEC registered package outline
Complies with the following
standards
IEC 61000-4-2 level 4:
15 kV (air discharge)
8 kV (contact discharge)
IEC 61000-4-5
MIL STD 883G, method 3015-7: class 3B:
25 kV HBM (human body model)
UL 497B, file number: QVGQ2.E136224
Resin meets UL 94, V0
MIL-STD-750, method 2026 solderability
EIA STD RS-481 and IEC 60286-3 packing
IPC 7531 footprint
Description
The SM6T Transil series are designed to protect
sensitive equipment against electrostatic
discharges according to IEC 61000-4-2 and MIL
STD 883, method 3015, and electrical overstress
according to IEC 61000-4-4 and 5. These
devices are more generally used against surges
below 600 W (10/1000 μs).
The Planar technology makes it suitable for high-
end equipment and SMPS where low leakage
current and high junction temperature are
required to provide reliability and stability over
time.
SM6T are packaged in SMB (SMB footprint in
accordance with IPC 7531 standard).
K
A
Unidirectional Bidirectional
SMB
(JEDEC DO-214AA)
K
A
SM6T
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DocID3082 Rev 10
1 Characteristics
Table 1: Absolute maximum ratings (Tamb = 25 °C)
Symbol
Parameter
Value
Unit
PPP
Peak pulse power dissipation(1)
Tj initial = Tamb
600
W
Tstg
Storage temperature range
-65 to +150
°C
Tj
Operating junction temperature range
-55 to +150
°C
TL
Maximum lead temperature for soldering during 10 s
260
°C
Notes:
(1)For a surge greater than the maximum values, the diode will fail in short-circuit.
Table 2: Thermal resistance
Symbol
Parameter
Value
Unit
Rth(j-l)
Junction to leads
20
°C/W
Rth(j-a)
Junction to ambient on printed circuit on recommended pad layout
100
°C/W
Figure 1: Electrical characteristics - parameter definitions
Figure 2: Pulse definition for electrical characteristics
SM6T
Characteristics
DocID3082 Rev 10
3/11
Table 3: Electrical characteristics parameter values (Tamb = 25 °C, unless otherwise specified)
Order code
IRM max at VRM
VBR at IR(1)
10 / 1000 µs
8 / 20µs
αT(2)
VCL
IPP
RD
VCL
IPP
RD
25
°C
85
°C
Min.
Typ.
Max.
Max.
Max.
Max.
Max.
µA
V
V
mA
V(3)
A(4)
Ω
V
A
Ω
10-
4/°C
SM6T6V8A/CA
20
50
5.8
6.45
6.8
7.14
10
10.5
57
0.059
14.4
275
0.027
5.7
SM6T7V5A/CA
20
50
6.4
7.13
7.5
7.88
10
11.3
53
0.065
15.2
266
0.027
6.1
SM6T10A/CA
20
50
8.55
9.5
10.0
10.5
1
14.5
41
0.098
18.6
215
0.038
7.3
SM6T12A/CA
0.2
1
10.2
11.4
12
12.6
1
16.7
36
0.114
21.7
184
0.049
7.8
SM6T15A/CA
0.2
1
12.8
14.3
15
15.8
1
21.2
28
0.193
27.2
147
0.078
8.4
SM6T18A/CA
0.2
1
15.3
17.1
18
18.9
1
25.2
24
0.263
32.5
123
0.111
8.8
SM6T22A/CA
0.2
1
18.8
20.9
22
23.1
1
30.6
20
0.375
39.3
102
0.159
9.2
SM6T24A/CA
0.2
1
20.5
22.8
24
25.2
1
33.2
18
0.444
42.8
93
0.189
9.4
SM6T27A/CA
0.2
1
23.1
25.7
27
28.4
1
37.5
16
0.569
48.3
83
0.240
9.6
SM6T30A/CA
0.2
1
25.6
28.5
30
31.5
1
41.5
14.5
0.690
53.5
75
0.293
9.7
SM6T33A/CA
0.2
1
28.2
31.4
33
34.7
1
45.7
13.1
0.840
59.0
68
0.357
9.8
SM6T36A/CA
0.2
1
30.8
34.2
36
37.8
1
49.9
12
1.01
64.3
62
0.427
9.9
SM6T39A/CA
0.2
1
33.3
37.1
39
41.0
1
53.9
11.1
1.16
69.7
57
0.504
10.0
SM6T56A/CA
0.2
1
47.6
53.2
56
58.8
1
76.6
7.8
2.28
100
40
1.030
10.0
SM6T68A/CA
0.2
1
58.1
64.6
68
71.4
1
92
6.5
3.17
121
33
1.503
10.4
SM6T75A/CA
0.2
1
64.1
71.3
75
78.8
1
103
5.8
4.17
134
30
1.84
10.5
SM6T100A/CA
0.2
1
85.5
95.0
100
105
1
137
4.4
7.27
178
22.5
3.24
10.6
SM6T150A/CA
0.2
1
128
143
150
158
1
207
2.9
16.9
265
15
7.13
10.8
SM6T200A/CA
0.2
1
171
190
200
210
1
274
2.2
29.1
353
11.3
12.7
10.8
SM6T220A/CA
0.2
1
188
209
220
231
1
328
2
48.5
388
10.3
15.2
10.8
Notes:
(1)Pulse test: tp < 50 ms
(2)To calculate VBR or VCL versus junction temperature, use the following formulas:
VBR at TJ = VBR at 25 °C x (1 + αT x (TJ - 25)) VCL at TJ = VCL at 25 °C x (1 + αT x (TJ-25))
(3)To calculate maximum clamping voltage at other surge level, use the following formula:
VCLmax = VBR max + RD x IPPappli where IPPappli is the surge current in the application
(4)Surge capability given for both directions for unidirectional and bidirectional types.
SM6T
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DocID3082 Rev 10
1.1 Characteristics (curves)
Figure 3: Peak power dissipation versus initial
junction temperature
Figure 4: Peak pulse power versus exponential
pulse duration
Figure 5: Clamping voltage versus peak pulse current (maximum values)
0
100
200
300
400
500
600
700
0 25 50 75 100 125 150 175
Ppp (W)
Tj(°C)
0.1
1.0
10.0
100.0
1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01
PPP(kW)
Tjinitial = 25 °C
tP(ms)
0.1
1.0
10.0
100.0
1000.0
1 10 100 1000
IPP(A )
10/1000 µs
Tjinitial=25 °C
8/20 µs
10 ms
SM6T6V8A
SM6T220A
SM6T15A
SM6T30A
SM6T68A
SM6T100A
VCL
(V)
SM6T
Characteristics
DocID3082 Rev 10
5/11
Figure 6: Capacitance versus reverse applied
voltage for unidirectional types (typical values)
Figure 7: Capacitance versus reverse applied
voltage for bidirectional types (typical values)
Figure 8: Peak forward voltage drop versus peak
forward current (typical values)
Figure 9: Relative variation of thermal impedance
junction to ambient versus pulse duration
Figure 10: Thermal resistance junction to ambient
versus copper surface under each lead
Figure 11: Leakage current versus junction
temperature (typical values)
C(pF)
10
100
1000
10000
1 10 100 1000
F=1 MHz
Vosc=30 mVRMS
Tj=25 °C
SM6T6V8A
SM6T15A
SM6T30A
SM6T68A
SM6T100A
SM6T220A
VR(V)
C(pF)
10
100
1000
10000
1 10 100 1000
F=1 MHz
Vosc=30 mVRMS
Tj=25 °C
SM6T6V8CA
SM6T15CA
SM6T30CA
SM6T68CA
SM6T100CA
SM6T220CA
VR(V)
1.0E-02
1.0E-01
1.0E+00
1.0E+01
1.0E+02
0.0 0.5 1.0 1.5 2.0 2.5 3.0
IFM(A)
Tj=25 °C
Tj=125 °C
VFM(V)
Zth (j-a)/Rth (j-a)
0.01
0.10
1.00
1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03
Recommended pad layout
Printed circuit board FR4, copper thickness = 35 µm
s
tp
0
10
20
30
40
50
60
70
80
90
100
110
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Rth(j-a)(°C/W)
(printed circuit board FR4,
copper thic kness = 35 µm)
SCu(cm²)
IR(nA)
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
25 50 75 100 125 150
VR=VRM
VRM ≥10V
VR=VRM
VRM < 10 V
T (° C)
j
SM6T
6/11
DocID3082 Rev 10
2 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Case: JEDEC DO214-AA molded plastic over planar junction
Terminals: solder plated, solderable per MIL-STD-750, method 2026
Polarity: for unidirectional types the band indicates cathode.
Flammability: epoxy is rated UL94V-0
RoHS package
2.1 SMB package information
Figure 12: SMB package outline
SM6T
Package information
DocID3082 Rev 10
7/11
Table 4: SMB package mechanical data
Ref.
Dimensions
Millimeters
Inches
Min.
Max.
Min.
Max.
A1
1.90
2.45
0.0748
0.0965
A2
0.05
0.20
0.0020
0.0079
b
1.95
2.20
0.0768
0.0867
c
0.15
0.40
0.0059
0.0157
D
3.30
3.95
0.1299
0.1556
E
5.10
5.60
0.2008
0.2205
E1
4.05
4.60
0.1594
0.1811
L
0.75
1.50
0.0295
0.0591
Figure 13: SMB recommended footprint
Figure 14: Marking layout
millimeters
(inches)
1.62
0.064 1.62
0.064
2.60
(0.102)
5.84
(0.230)
2.18
(0.086)
Note: Marking layout can vary according to assembly location.
y ww
e
z
x x x e: ECOPACK compliance
XXX: Marking
Z: Manufacturing location
Y:Year
WW:Week
Cathode bar (unidirectional devices only)
SM6T
8/11
DocID3082 Rev 10
3 Ordering information
Figure 15: Ordering information scheme
Table 5: Ordering information
Order code
Marking
Package
Weight
Base qty.
Delivery mode
SM6TxxxA/CA(1)
See Table 6: "Marking".
SMB
0.11 g
2500
Tape and reel
Notes:
(1)Where xxx is nominal value of VBR and A or CA indicates unidirectional or bidirectional version. See Table 3:
"Electrical characteristics parameter values (Tamb = 25 °C, unless otherwise specified)" for list of
available devices and their order codes.
SM 6 T 100 CA
Package:
SMB
Power capability (10 / 1000 µs):
600 W
Stand-off voltage:
VRM
Type:
CA : bidirectional
A: unidirectional
SM6T
Ordering information
DocID3082 Rev 10
9/11
Table 6: Marking
Order code
Marking
Order code
Marking
SM6T6V8A
DE
SM6T6V8CA
LE
SM6T7V5A
DG
SM6T7V5CA
LG
SM6T10A
DP
SM6T10CA
LP
SM6T12A
DT
SM6T12CA
LT
SM6T15A
DX
SM6T15CA
LX
SM6T18A
EE
SM6T18CA
ME
SM6T22A
EK
SM6T22CA
MK
SM6T24A
EM
SM6T24CA
MM
SM6T27A
EP
SM6T27CA
MP
SM6T30A
ER
SM6T30CA
MR
SM6T33A
ET
SM6T33CA
MT
SM6T36A
EV
SM6T36CA
MV
SM6T39A
EX
SM6T39CA
MX
SM6T56A
FL
SM6T56CA
NL
SM6T68A
FQ
SM6T68CA
NQ
SM6T75A
FS
SM6T75CA
NS
SM6T100A
FY
SM6T100CA
NY
SM6T150A
GL
SM6T150CA
OL
SM6T200A
GU
SM6T200CA
OU
SM6T220A
GW
SM6T220CA
OW
SM6T
10/11
DocID3082 Rev 10
4 Revision history
Table 7: Document revision history
Date
Revision
Changes
Aug-2001
4A
Previous update.
15-Sep-2004
5
1. Types table parameters on page 2: IRM @ Tj = 85 °C condition
added 2. IRM max values changed
26-Mar-2009
6
Reformatted to current standard. SMB dimensions and footprint
updated. Maximum junction temperature replaced with operating
junction temperature range in Table 1.
25-May-2009
7
Reformatted to current standard. Added standards compliance
information on page 1. Added device SM6T56 to Table 3. Updated all
characteristic curves.
17-Sep-2009
8
Document updated for low leakage current.
20-Oct-2009
9
Updated Figure 13.
10-Jan-2018
10
Updated Table 3: "Electrical characteristics parameter values (Tamb =
25 °C, unless otherwise specified)".
SM6T
DocID3082 Rev 10
11/11
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