September 2009 Doc ID 3080 Rev 6 1/10
10
SM15T
Transil™
Features
Peak pulse power:
1500 W (10/1000 µs)
10 kW (8/20 µs)
Breakdown 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 Tjmax:
1250 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
See Ta bl e 3 for surge level
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 soldererabilty
EIA STD RS-481 and IEC 60286-3 packing
IPC 7531 footprint
Description
The SM15T Transil series has been designed to
protect sensitive equipment against electrostatic
discharges according to IEC 61000-4-2, and
MIL STD 883, method 3015, and electrical over
stress according to IEC 61000-4-4 and 5. These
devices are more generally used against surges
below 1500 W (10/1000 µs).
Planar technology makes these devices suitable
for high-end equipment and SMPS where low
leakage current and high junction temperature are
required to provide reliability and stability over
time.
SM15T are packaged in SMC (SMC footprint in
accordance with IPC 7531 standard).
TM: Transil is a trademark of STMicroelectronics
K
A
Unidirectional Bidirectional
SMC
(JEDEC DO-214AB)
www.st.com
Characteristics SM15T
2/10 Doc ID 3080 Rev 6
1 Characteristics
Figure 1. Electrical characteristics - definitions
Figure 2. Pulse definition for electrical characteristics
Table 1. Absolute maximum ratings (Tamb = 25 °C)
Symbol Parameter Value Unit
PPP Peak pulse power dissipation(1) T
j initial = Tamb 1500 W
Tstg Storage temperature range -65 to + 150 °C
TjOperating junction temperature range -55 to + 150 °C
TLMaximum lead temperature for soldering during 10 s. 260 °C
1. For a surge greater than the maximum values, the diode will fail in short-circuit.
Table 2. Thermal parameter
Symbol Parameter Value Unit
Rth(j-l) Junction to leads 15 °C/W
Rth(j-a) Junction to ambient on printed circuit on recommended pad layout 90 °C/W
V
CL
V
BR
V
RM
I
RM
I
R
I
PP
V
I
I
RM
I
R
I
PP
V
RM
V
BR
V
CL
V
CL
V
BR
V
RM
I
RM
I
R
I
PP
V
I
I
RM
I
R
I
PP
V
RM
V
BR
V
CL
V
CL
V
BR
V
RM
I
RM
I
R
I
PP
V
I
I
F
V
F
V
CL
V
BR
V
RM
I
RM
I
R
I
PP
V
I
I
F
V
F
Unidirectional
Bidirectional
Symbol Parameter
V Stand-off voltage
V Breakdown voltage
V Clamping voltage
I Leakage current @ V
I Peak pulse current
T Voltage temperature coefficient
V Forward voltage drop
R Dynamic resistance
RM
BR
CL
RM RM
PP
F
D
α
100
50
0
Pulse waveform
tr = rise time (µs)
tp = pulse duration time (µs)
t
%IPP
tp
tr
SM15T Characteristics
Doc ID 3080 Rev 6 3/10
Table 3. Electrical characteristics, parameter values (Tamb = 25 °C)
Order code
IRM max@VRM VBR @IR (1) VCL @IPP
10/1000 µs
RD
10/1000
µs
VCL @IPP
8/20 µs
RD
8/20
µs
αT (2)
25 °C 85 °C min typ max max max max
µA V V mA V(3) A(4) ΩV(3) A(4) Ω10-4/ °C
SM15T6V8A/CA 500 2000 5.8 6.45 6.8 7.14 10 10.5 143 0.023 13.4 746 0.008 5.7
SM15T7V5A/CA 250 1000 6.4 7.13 7.5 7.88 10 11.3 132 0.026 14.5 690 0.010 6.1
SM15T10A/CA 10 50 8.55 9.5 10 10.5 1 14.5 103 0.039 18.6 538 0.015 7.3
SM15T12A/CA 0.2 1 10.2 11.4 12 12.6 1 16.7 90 0.046 21.7 461 0.020 7.8
SM15T15A/CA 0.2 1 12.8 14.3 15 15.8 1 21.2 71 0.076 27.2 368 0.031 8.4
SM15T18A/CA 0.2 1 15.3 17.1 18 18.9 1 25.2 59.5 0.106 32.5 308 0.044 8.8
SM15T22A/CA 0.2 1 18.8 20.9 22 23.1 1 30.6 49 0.153 39.3 254 0.064 9.2
SM15T24A/CA 0.2 1 20.5 22.8 24 25.2 1 33.2 45 0.178 42.8 234 0.075 9.4
SM15T27A/CA 0.2 1 23.1 25.7 27 28.4 1 37.5 40 0.228 48.3 207 0.096 9.6
SM15T30A/CA 0.2 1 25.6 28.5 30 31.5 1 41.5 36 0.278 53.5 187 0.12 9.7
SM15T33A/CA 0.2 1 28.2 31.4 33 34.7 1 45.7 33 0.333 59.0 169 0.14 9.8
SM15T36A/CA 0.2 1 30.8 34.2 36 37.8 1 49.9 30 0.403 64.3 156 0.17 9.9
SM15T39A/CA 0.2 1 33.3 37.1 39 41.0 1 53.9 28 0.461 69.7 143 0.20 10.0
SM15T68A/CA 0.2 1 58.1 64.6 68 71.4 1 92 16.3 1.26 121 83 0.60 10.4
SM15T75A/CA 0.2 1 64.1 71.3 75 78.8 1 103 14.6 1.66 134 75 0.74 10.5
SM15T100A/CA 0.2 1 85.5 95.0 100 105 1 137 11 2.91 178 56 1.30 10.6
SM15T150A/CA 0.2 1 128 143 150 158 1 207 7.2 6.81 265 38 2.82 10.8
SM15T200A/CA 0.2 1 171 190 200 210 1 274 5.5 11.6 353 28 5.11 10.8
SM15T220A/CA 0.2 1 188 209 220 231 1 328 4.6 21.1 388 26 6.04 10.8
1. Pulse test : tp < 50 ms
2. To calculate VBR versus junction temperature, use the following formula: VBR @ TJ = VBR @ 25°C x (1 + αT x (TJ – 25)).
3. To calculate maximum clamping voltage at other surge level, use the following formula: VCL = RD x IPP + VBRmax.
4. Surge capability given for both directions for unidirectional and bidirectional types.
Characteristics SM15T
4/10 Doc ID 3080 Rev 6
Figure 5. Clamping voltage versus peak pulse current (maximum values)
Figure 3. Peak pulse power dissipation
versus initial junction temperature
(printed circuit board)
Figure 4. Peak pulse power versus
exponential pulse duration
0
500
1000
1500
2000
0 25 50 75 100 125 150 175
P
pp
(W)
10/1000 µs
Tj(°C)
P (kW)
PP
0.1
1.0
10.0
100.0
1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01
Tjinitial = 25 °C
t (ms)
p
IPP (A)
0.1
1.0
10.0
100.0
1000.0
1 10 100 1000
Tjinitial=25 °C
8/20 µs
10/1000 µs
10 ms
VCL (V)
SM15T 6V8A
SM15T 10A
SM15T 22A
SM15T 30A
SM15T 68A
SM15T 150A
SM15T 220A
SM15T Characteristics
Doc ID 3080 Rev 6 5/10
Figure 6. Capacitance versus reverse applied
voltage (typical values, SM15TxxA)
Figure 7. Capacitance versus reverse applied
voltage (typical values,
SM15TxxCA)
C (nF)
0.01
0.10
1.00
10.00
1 10 100 1000
F=1 MHz
Vosc=30 mVRMS
Tj=25 °C
SM15T6V8A
SM15T15A
SM15T30A
SM15T68A
SM15T200A
V (V)
R
C (nF)
0.1
1.0
10.0
1 10 100 1000
F=1 MHz
Vosc=30 mVRMS
Tj=25 °C
SM15T6V8CA
SM15T15CA
SM15T30CA
SM15T68CA
SM15T200CA
V (V)
R
Figure 8. Peak forward voltage drop versus
forward current (typical values)
Figure 9. Relative variation of thermal
impedance junction to ambient
versus pulse duration
I (A)
FM
0.1
1.0
10.0
100.0
0.0 0.5 1.0 1.5 2.0 2.5
Tj=25 °C
Tj=125 °C
V (V)
FM
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
Z
th(j-a)
/R
th(j-a)
Recommended pad layout
tP(s)
Figure 10. Thermal resistance junction to
ambient versus copper surface
under each lead
Figure 11. Leakage current versus junction
temperature (typical values)
Rth(j-a)(°C/ W)
0
10
20
30
40
50
60
70
80
90
100
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
printed circuit board FR4,
copper thickness = 35 µm
SCu (cm²)
IR(n A)
1.0E+00
1.0E+01
1.0E+02
1.0E+03
1.0E+04
25 50 75 100 125 150
V
R
=V
RM
V
RM
10 V
V
R
=V
RM
V
RM
< 10 V
T (°C)
j
Ordering information scheme SM15T
6/10 Doc ID 3080 Rev 6
2 Ordering information scheme
Figure 12. Ordering information scheme
SM 15 T 100 CA
Surface mount
Surge rating
15 = 1500 W Transil in SMC
Breakdown voltage
100 = 100 V
Types
CA = Bidirectional
A = Unidirectional
SM15T Package information
Doc ID 3080 Rev 6 7/10
3 Package information
Case: JEDEC DO-214AB molded plastic over planar junction
Terminals: solder plated, solderable as per MIL-STD-750, Method 2026
Polarity: for unidirectional types the band indicates cathode
Flammability: epoxy is rated UL 94, V0
RoHS package
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.
Table 4. SMC dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A1 1.90 2.45 0.075 0.096
A2 0.05 0.20 0.002 0.008
b 2.90 3.20 0.114 0.126
c 0.15 0.40 0.006 0.016
D 5.55 6.25 0.218 0.246
E 7.75 8.15 0.305 0.321
E1 6.60 7.15 0.260 0.281
E2 4.40 4.70 0.173 0.185
L 0.75 1.50 0.030 0.059
E
CLE2
E1
D
A1
A2
b
Figure 13. SMC footprint dimensions in mm
(inches)
Figure 14. Marking layout(1)
1. Marking layout can vary according to assembly location.
8.19
1.545.111.54
(0.061) (0.201)
(0.322)
(0.124)
(0.061)
3.14
y w w
e
z
x x x
e: ECOPACK compliance
XXX: Marking
Z: Manufacturing location
Y: Year
WW: week
Cathode bar (unidirectional devices only )
Package information SM15T
8/10 Doc ID 3080 Rev 6
Table 5. Marking
Order code Marking Order code Marking
SM15T6V8A MDE SM15T6V8CA BDE
SM15T7V5A MDG SM15T7V5CA BDG
SM15T10A MDP SM15T10CA BDP
SM15T12A MDT SM15T12CA BDT
SM15T15A MDX SM15T15CA BDX
SM15T18A MEE SM15T18CA BEE
SM15T22A MEK SM15T22CA BEK
SM15T24A MEM SM15T24CA BEM
SM15T27A MEP SM15T27CA BEP
SM15T30A MER SM15T30CA BER
SM15T33A MET SM15T33CA BET
SM15T36A MEV SM15T36CA BEV
SM15T39A MEX SM15T39CA BEX
SM15T68A MFP SM15T68CA BFP
SM15T75A MFO SM15T75CA BFO
SM15T100A MFX SM15T100CA BFX
SM15T150A MGK SM15T150CA BGK
SM15T200A MGV SM15T200CA BGV
SM15T220A MGX SM15T220CA BGX
SM15T Ordering information
Doc ID 3080 Rev 6 9/10
4 Ordering information
5 Revision history
Table 6. Ordering information
Order code Marking Package Weight Base qty Delivery mode
SM15TxxxA/CA(1)
1. Where xxx is nominal value of VBR and A or CA indicates unidirectional or bidirectional version. See
Table 3 for list of available devices and their order codes
See Table 5 on page 8 SMC 0.25 g 2500 Tape and reel
Table 7. Document revision history
Date Revision Description of changes
September-2001 3B Last issue
19-Feb-2007 4 Peak pulse power Figure 4 on page 4 updated.
04-Feb-2009 5
Updated ECOPACK statement. Added RD columns in
Ta bl e 3 . Updated characteristic curves, Figure 3 to
Figure 11.
17-Sep-2009 6 Document updated for low leakage current.
SM15T
10/10 Doc ID 3080 Rev 6
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