This is information on a product in full production.
March 2012 Doc ID 17741 Rev 3 1/12
12
SM6TY
Automotive 600 W Transil™
Datasheet − production data
Features
■Peak pulse power:
– 600 W (10/1000 µs)
– 4 kW (8/20 µs)
■Stand-off voltage range: from 6 V to 70 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
■Resin meets UL 94, V0
■AEC-Q101 qualified
Complies with the following standards
■ISO 10605, C = 150 pF, R = 330 Ω:
– 30 kV (air discharge)
– 30 kV (contact discharge)
■ISO 10605, C = 330 pF, R = 330 Ω:
– 30 kV (air discharge)
– 30 kV (contact discharge)
■ISO 7637-2(a)
– Pulse 1: VS = -100 V
– Pulse 2a: VS = +50 V
– Pulse 3a: VS = -150 V
– Pulse 3b: VS = +100 V
Description
The SM6TY Transil series has been designed to
protect sensitive automotive circuits against
surges defined in ISO 7637-2 and against
electrostatic discharges according ISO 10605.
The planar technology makes this device
compatible with high-end circuits where low
leakage current and high junction temperature are
required to provide reliability and stability over
time. SM6TY are packaged in SMB (SMB
footprint in accordance with IPC 7531 standard).
TM: Transil is a trademark of STMicroelectronics
a. Not applicable to parts with stand-off voltage lower
than the average battery voltage (13.5 V)
K
A
Unidirectional Bidirectional
SMB
(JEDEC DO-214AA)
www.st.com
Characteristics SM6TY
2/12 Doc ID 17741 Rev 3
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
VPP Peak pulse voltage
ISO 10605 (C = 330 pF, R = 330 Ω):
Contact discharge
Air discharge
ISO 10605 (C = 150 pF, R = 330 Ω):
Contact discharge
Air discharge
30
30
30
30
kV
PPP Peak pulse power dissipation(1) Tj initial = Tamb 600 W
TjOperating junction temperature range -55 to 150
Tstg Storage temperature range -65 to 150 °C
TLMaximum lead temperature for soldering during 10 s. 260
1. For a surge greater than the maximum values, the diode will fail in short-circuit.
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
Repetitive pulse current
tr= rise time (µs)
tp= pulse duration time (µs)
trtp
SM6TY Characteristics
Doc ID 17741 Rev 3 3/12
Table 2. Electrical characteristics, parameter values (Tamb = 25 °C)
Order code
IRM max @ VRM VBR @IR (1) VCL @ IPP
10/1000 µs
RD (2)
10/1000 µs
VCL @ IPP
8/20 µs
RD (2)
8/20 µs αT
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
SM6T6V8AY/CAY 20 50 5.80 6.45 6.80 7.10 10 10.5 57.0 0.059 13.4 298 0.021 5.70
SM6T7V5AY/CAY 20 50 6.40 7.13 7.50 7.90 10 11.3 53.0 0.065 14.5 276 0.024 6.10
SM6T10AY/CAY 20 50 8.55 9.50 10.0 10.5 1 14.5 41.0 0.098 18.6 215 0.038 7.30
SM6T12AY/CAY 0.2 1 10.2 11.4 12.0 12.6 1 16.7 36.0 0.114 21.7 184 0.049 7.80
SM6T15AY/CAY 0.2 1 12.8 14.3 15.0 15.8 1 21.2 28v 0.193 27.2 147 0.078 8.40
SM6T18AY/CAY 0.2 1 15.3 17.1 18.0 18.9 1 25.2 24.0 0.263 32.5 123 0.111 8.80
SM6T22AY/CAY 0.2 1 18.8 20.9 22.0 23.1 1 30.6 20.0 0.375 39.3 102 0.159 9.20
SM6T24AY/CAY 0.2 1 20.5 22.8 24.0 25.2 1 33.2 18.0 0.444 42.8 93.0 0.189 9.40
SM6T27AY/CAY 0.2 1 23.1 25.7 27.0 28.4 1 37.5 16.0 0.569 48.3 83.0 0.240 9.60
SM6T30AY/CAY 0.2 1 25.6 28.5 30.0 31.5 1 41.5 14.5 0.69 53.5 75.0 0.293 9.70
SM6T33AY/CAY 0.2 1 28.2 31.4 33.0 34.7 1 45.7 13.1 0.84 59.0 68.0 0.357 9.80
SM6T36AY/CAY 0.2 1 30.8 34.2 36.0 37.8 1 49.9 12.0 1.01 64.3 62.0 0.427 9.90
SM6T39AY/CAY 0.2 1 33.3 37.1 39.0 41.0 1 53.9 11.1 1.16 69.7 57.0 0.504 10.0
SM6T42AY/CAY 0.2 1 36.0 40.0 42.1 44.2 1 58.1 10.3 1.35 76.0 52.0 0.611 10.0
SM6T47AY/CAY 0.2 1 40.0 44.4 46.7 49.0 1 64.5 9.7 1.59 84.0 48.0 0.728 10.1
SM6T56AY/CAY 0.2 1 47.6 53.2 56.0 58.8 1 76.6 7.8 2.28 100 40.0 1.03 10.0
SM6T68AY/CAY 0.2 1 58.1 64.6 68.0 71.4 1 92 6.5 3.17 121 33.0 1.50 10.4
SM6T75AY/CAY 0.2 1 64.1 71.3 75.0 78.8 1 103 5.8 4.17 134 30.0 1.84 10.5
SM6T82AY/CAY 0.2 1 70.0 77.8 81.9 86.0 1 113 5.5 4.91 146 27.0 2.22 10.5
1. Pulse test: tp < 50 ms
2. To calculate maximum clamping voltage at another surge level, use the following formula:
VCLmax = VCL - RD x (IPP - IPPappli) where IPPappli is the surge current in the application.
3. To calculate VBR or VCL versus junction temperature, use the following formulas:
VBR @ TJ = VBR @ 25°C x (1 + αT x (TJ - 25))
VCL @ TJ = VCL @ 25°C x (1 + αT x (TJ - 25))
4. Surge capability given for both directions for unidirectional and bidirectional types.
Characteristics SM6TY
4/12 Doc ID 17741 Rev 3
Figure 5. Clamping voltage versus peak pulse current exponential waveform (maximum values)
Figure 3. Peak power dissipation versus
initial junction temperature
(typical values)
Figure 4. Peak pulse power versus
exponential pulse duration
0
100
200
300
400
500
600
700
10/1000 µs
0 25 50 75 100 125 150 175
P
pp
(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
P
PP
(kW)
T
j
initial = 25 °C
t
P
(ms)
0.1
1.0
10.0
100.0
1000.0
1 10 100 1000
I
PP
(A)
SM6T30AY/CAY
SM6T82AY/CAY
SM6T6V8AY/CAY
T = 25 °C
j initial
8/20 µs
10/1000 µs
V (V)
CL
SM6TY Characteristics
Doc ID 17741 Rev 3 5/12
Figure 6. ISO 7637-2 pulse 1 response (VS = -100 V)
Figure 7. ISO 7637-2 pulse 2a response (VS = 50 V)
SM6T36AY
SM6T36CAY
Voltage (V)
Current (A)
Time (ms)
0.0 1.0 2.0 3.0 4.0
0
-10
-20
-30
-40
-50
0
-2
-4
-6
-8
-10
-12
10
SM6T36AY
SM6T36CAY
Voltage (V)
Current (A)
Time (µs)
02030405060708090100
0
10
30
20
40
50
0
2
4
6
8
10
12
Note: Curves superimposed
Characteristics SM6TY
6/12 Doc ID 17741 Rev 3
Figure 8. ISO 7637-2 pulse 3a response (VS = -150 V)
Figure 9. ISO 7637-2 pulse 3b response (VS = 100 V)
Note: ISO7637-2 pulses responses are not applicable for products with a stand off voltage lower
than the average battery voltage (13.5 V).
SM6T36AY
SM6T36CAY
Voltage (V)
Current (A)
Time (µs)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
0
20
-20
-40
-50
-30
-10
10
0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
0.5
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
SM6T36AY
SM6T36CAY
Voltage (V)
Current (A)
Time (µs)
Note: Curves superimposed
10
20
30
40
50
60
0
0
0.5
1.0
1.5
2.0
2.5
3.0
SM6TY Characteristics
Doc ID 17741 Rev 3 7/12
Figure 10. Junction capacitance versus reverse
applied voltage for unidirectional
types (typical values)
Figure 11. Junction capacitance versus
reverse applied voltage for
bidirectional types (typical values)
C(pF)
10
100
1000
10000
1 10 100 1000
SM6T6V8AY
SM6T30AY
SM6T82AY
F = 1 Mhz
V = 30 mV
T = 25 °C
OSC RMS
j
V (V)
R100
1000
10000
1 10 100 1000
C(pF)
SM6T6V8CAY
SM6T30CAY
SM6T82CAY
F = 1 Mhz
V = 30 mV
T = 25 °C
OSC RMS
j
V (V)
R
Figure 12. Relative variation of thermal
impedance, junction to ambient,
versus pulse duration
Figure 13. Thermal resistance junction to
ambient versus copper surface
under each lead
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+0
3
Recommended pad layout
Printed circuit board FR4, copper thickness = 35 µm
s
tp
R
th(j-a)
(°C/W)
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
Printed circuit board FR4,
copper thickness = 35 µm
SCu(cm²)
Figure 14. Leakage current versus junction
temperature (typical values)
Figure 15. Peak forward voltage drop versus
peak forward current
(typical values)
I
R
(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 ≥10 V
VR=VRM
VRM < 10 V
T (° C)
j
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
I
FM
(A)
T
j
=25 °C
T
j
=125 °C
V
FM
(V)
Application and design guidelines SM6TY
8/12 Doc ID 17741 Rev 3
2 Application and design guidelines
More information is available in the ST Application note AN2689 “Protection of automotive
electronics from electrical hazards, guidelines for design and component selection”.
3 Ordering information scheme
Figure 16. Ordering information scheme
SM 6 T XX CA Y
Surface mount
Peak pulse power
Breakdown voltage
Types
Automotive grade
6 = 600 W Transil in SMB
30 = 30 V
CA = Bidirectional
A = Unidirectional
SM6TY Packaging information
Doc ID 17741 Rev 3 9/12
4 Packaging information
●Case: JEDEC DO-214AA 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 meets 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 3. SMB 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 1.95 2.20 0.077 0.087
c 0.15 0.40 0.006 0.016
D 3.30 3.95 0.130 0.156
E 5.10 5.60 0.201 0.220
E1 4.05 4.60 0.159 0.181
L 0.75 1.50 0.030 0.059
Figure 17. SMB footprint dimensions in
mm (inches)
Figure 18. Marking layout(1)
1. Marking layout can vary according to assembly location.
E
CL
E1
D
A1
A2 b
2.60
5.84
1.62
2.18
1.62
(0.064) (0.102)
(0.300)
(0.064)
(0.086)
y w wz
x x x
ECOPACK compliance
XXX: Marking
Z: Manufacturing location
Y: Year
WW: Week
Cathode bar (unidirectional devices only )
Ordering information SM6TY
10/12 Doc ID 17741 Rev 3
5 Ordering information
Table 4. Marking
Order code Marking Order code Marking
SM6T6V8AY DEY SM6T6V8CAY LEY
SM6T7V5AY DGY SM6T7V5CAY LGY
SM6T10AY DPY SM6T10CAY LPY
SM6T12AY DTY SM6T12CAY LTY
SM6T15AY DXY SM6T15CAY LXY
SM6T18AY EEY SM6T18CAY MEY
SM6T22AY EKY SM6T22CAY MKY
SM6T24AY EMY SM6T24CAY MMY
SM6T27AY EPY SM6T27CAY MPY
SM6T30AY ERY SM6T30CAY MRY
SM6T33AY ETY SM6T33CAY MTY
SM6T36AY EVY SM6T36CAY MVY
SM6T39AY EXY SM6T39CAY MXY
SM6T42AY FBY SM6T42CAY NAY
SM6T47AY FAY SM6T47CAY NBY
SM6T56AY FLY SM6T56CAY NLY
SM6T68AY FQY SM6T68CAY NQY
SM6T75AY FSY SM6T75CAY NSY
SM6T82AY FWY SM6T82CAY NWY
Table 5. Ordering information
Order code Marking Package Weight Base qty Delivery mode
SM6TxxxAy/CAy(1)
1. Where xxx is nominal value of VBR and A or CA indicates unidirectional or bidirectional version. See
Table 2 for list of available devices and their order codes
See Table 4 on page 10 SMB 0.11 g 2500 Tape and reel
SM6TY Revision history
Doc ID 17741 Rev 3 11/12
6 Revision history
Table 6. Document revision history
Date Revision Changes
15-Sep-2010 1 Initial release.
18-Oct-2011 2
Deleted old Table 2. Thermal parameter. Updated Table 2 and added
order codes inTable 4. Updated Figure 5, 10 and 11. Updated Complies
with the following standards on page 1.
27-Mar-2012 3 Added footnote on page 1.
SM6TY
12/12 Doc ID 17741 Rev 3
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