This is information on a product in full production.
March 2012 Doc ID 17865 Rev 3 1/12
12
SM15TY
Automotive 1500 W Transil™
Datasheet − production data
Features
■Peak pulse power:
– 1500 W (10/1000 µs)
– 10 kW (8/20 µs)
■Stand-off voltage range: from 5.8 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 Tjmax:
– 1250 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 SM15TY Transil series has been designed to
protect sensitive automotive circuits against
surges defined in ISO 7637-2 and against
electrostatic discharges according to ISO 10605.
The Planar technology makes it compatible with
high-end circuits where low leakage current and
high junction temperature are required to provide
reliability and stability over time. SM15TY are
packaged in SMC (SMC 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
SMC
(JEDEC DO-214AB)
www.st.com
Characteristics SM15TY
2/12 Doc ID 17865 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) T
j initial = Tamb 1500 W
Tstg Storage temperature range -65 to + 150 °C
TjOperating junction temperature range -40 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.
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
SM15TY Characteristics
Doc ID 17865 Rev 3 3/12
Table 2. Electrical characteristics, typical values unless otherwise stated (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
SM15T6V8AY/CAY 500 2000 5.8 6.45 6.8 7.14 10 10.5 143 0.023 13.4 746 0.008 5.7
SM15T7V5AY/CAY 250 1000 6.4 7.13 7.5 7.88 10 11.3 132 0.026 14.5 690 0.01 6.1
SM15T10AY/CAY 10 50 8.55 9.5 10 10.5 1 14.5 103 0.039 18.6 538 0.015 7.3
SM15T12AY/CAY 0.2 1 10.2 11.4 12 12.6 1 16.7 90 0.046 21.7 461 0.02 7.8
SM15T15AY/CAY 0.2 1 12.8 14.3 15 15.8 1 21.2 71 0.076 27.2 368 0.031 8.4
SM15T18AY/CAY 0.2 1 15.3 17.1 18 18.9 1 25.2 59.5 0.106 32.5 308 0.044 8.8
SM15T22AY/CAY 0.2 1 18.8 20.9 22 23.1 1 30.6 49 0.153 39.3 254 0.064 9.2
SM15T24AY/CAY 0.2 1 20.5 22.8 24 25.2 1 33.2 45 0.178 42.8 234 0.075 9.4
SM15T27AY/CAY 0.2 1 23.1 25.7 27 28.4 1 37.5 40 0.228 48.3 207 0.096 9.6
SM15T30AY/CAY 0.2 1 25.6 28.5 30 31.5 1 41.5 36 0.278 53.5 187 0.12 9.7
SM15T33AY/CAY 0.2 1 28.2 31.4 33 34.7 1 45.7 33 0.333 59 169 0.14 9.8
SM15T36AY/CAY 0.2 1 30.8 34.2 36 37.8 1 49.9 30 0.403 64.3 156 0.17 9.9
SM15T39AY/CAY 0.2 1 33.3 37.1 39 41.0 1 53.9 28 0.461 69.7 143 0.2 10
SM15T47AY/CAY 0.2 1 40.2 44.7 47 49.4 1 64.5 23.2 0.653 84 119 0.291 10.1
SM15T56AY/CAY 0.2 1 48 53.3 56 58.9 1 77.4 20 0.925 100 100 0.411 10.3
SM15T68AY/CAY 0.2 1 58.1 64.6 68 71.4 1 92 16.3 1.26 121 83 0.6 10.4
SM15T75AY/CAY 0.2 1 64.1 71.3 75 78.8 1 103 14.6 1.66 134 75 0.74 10.5
SM15T82AY/CAY 0.2 1 70 77.8 82 86.0 1 113 13.9 1.94 146 69 0.87 10.5
1. Pulse test: tp < 50 ms
2. To calculate maximum clamping voltage at other 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 SM15TY
4/12 Doc ID 17865 Rev 3
Figure 3. Peak pulse power dissipation
versus initial junction temperature
(typical values)
Figure 4. Peak pulse power versus
exponential pulse duration
(Tj initial = 25 °C)
0
500
1000
1500
2000
0 25 50 75 100 125 150 175
P (W)
PP
T (°C)
j
10/1000 µs
0.1
1.0
10.0
100.0
1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01
P (kW)
PP
tp(ms)
Figure 5. Clamping voltage versus peak
pulse current (exponential
waveform, maximum values)
Figure 6. Junction capacitance versus
reverse applied voltage for
unidirectional types (typical values)
I (A)
PP
0.1
1.0
10.0
100.0
1000.0
1 10 100 1000
10/1000 µs
8/20 µs
V (V)
CL
SM15T6V8AY/CAY
SM15T30AY/CAY
SM15T82AY/CAY
T = 25 °C
j initial
C(pF)
100
1000
10000
1 10 100 1000
SM15T6V8AY
SM15T30AY
SM15T82AY
V (V)
R
F = 1 MHz
V = 30 mV
T = 25 °C
OSC RMS
j
Figure 7. Junction capacitance versus
reverse applied voltage for
bidirectional types (typical values)
Figure 8. Thermal resistance junction to
ambient versus copper surface
under each lead
C(pF)
100
1000
10000
1 10 100 1000
SM15T6V8CAY
SM15T30CAY
SM15T82CAY
F = 1 MHz
V = 30 mV
T = 25 °C
OSC RMS
j
V (V)
R
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
R (°C/W)
th(j-a)
S (cm²)
Cu
Printed circuit board FR4,
copper thickness = 35 µm
SM15TY Characteristics
Doc ID 17865 Rev 3 5/12
Figure 11. Relative variation of thermal impedance junction to ambient versus pulse duration
Figure 9. Leakage current versus junction
temperature (typical values)
Figure 10. Peak forward voltage drop versus
peak forward current
(typical values)
I (nA)
R
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
25 50 75 100 125 150
T (°C)
j
V=V
RRM
V < 10 V
RM
V10V
RM
≥
0.1
1.0
10.0
100.0
0.0 0.5 1.0 1.5 2.0 2.5
V (V)
FM
I (A)
FM
T = 25 °C
j
T = 125 °C
j
0.01
0.10
1.00
1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03
Recommended pad layout
Single pulse
printed circuit board,
copper thickness = 35 µm
Z/R
th(j-a) th(j-a)
t (s)
p
Characteristics SM15TY
6/12 Doc ID 17865 Rev 3
Figure 12. ISO7637-2 pulse 1 response (VS = -100 V)
Figure 13. ISO7637-2 pulse 2 response (VS = 50 V)
Voltage (V)
Voltage
-50
10
0
-10
-20
-30
-40
-0.5 0.0 0.5 1.0 1.5 2.0 2.5
-0.5 0.0 0.5 1.0 1.5 2.0 2.5
-15
5
-5
-10
0
Current
Current (A)
SM15T39AY
SM15T39CAY
SM15T39AY
SM15T39CAY
Time (ms)
Time (ms)
Voltage (V)
Voltage
10
0-20 0 20 40 60 80 100
-4
4
0
Current
Current (A)
SM15T39AY
SM15T39CAY
SM15T39AY
SM15T39CAY
10
50
40
30
20
-20 0 20 40 60 80 100
8
12
Time (µs)
Time (µs)
SM15TY Characteristics
Doc ID 17865 Rev 3 7/12
Figure 14. ISO7637-2 pulse 3a response (VS = -150 V)
Figure 15. ISO7637-2 pulse 3b response (VS = 100 V)
Note: ISO7637-2 pulses responses are not applicable for product with a stand off voltage lower
than the average battery voltage (13.5 V).
Voltage (V)
Voltage
-20
-2
0.0
-1
Current
Current (A)
SM15T39AY
SM15T39CAY
SM15T39AY
SM15T39CAY
-40
20
0.0
-0.2 0.8 1.8 0.0 0.0 0.0
1
-0.5 0.0 0.5 1.0 1.5 2.0
-60
Time (µs)
Time (µs)
Voltage (V)
Voltage
20
-0.4
0
Current
Current (A)
SM15T39AY
SM15T39CAY
SM15T39AY
SM15T39CAY
10
40
30
-0.2 0.8 1.8
0
Time (µs)
Time (µs)
-0.2 0.8 1.8
50
0.4
0.8
1.2
Application and design guidelines SM15TY
8/12 Doc ID 17865 Rev 3
2 Application and design guidelines
More information is available in the 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
Surface mount
Surge rating
15 = 1500 W Transil in SMC
Breakdown voltage
Types
CA = Bidirectional
A = Unidirectional
Automotive grade
SM 15T XX CA Y
SM15TY Package information
Doc ID 17865 Rev 3 9/12
4 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 3. 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
Figure 17. SMC footprint dimensions in
mm (inches)
Figure 18. Marking layout(1)
1. Marking layout can vary according to assembly location.
E
CLE2
E1
D
A1
A2 b
8.19
1.545.111.54
(0.061) (0.201)
(0.322)
(0.124)
(0.061)
3.14
y w wz
x x x
ECOPACK compliance
XXX: Marking
Z: Manufacturing location
Y: Year
WW: week
Cathode bar (unidirectional devices only )
Package information SM15TY
10/12 Doc ID 17865 Rev 3
Table 4. Marking
Order code Marking Order code Marking
SM15T6V8AY MDEY SM15T6V8CAY BDEY
SM15T7V5AY MDGY SM15T7V5CAY BDGY
SM15T10AY MDPY SM15T10CAY BDPY
SM15T12AY MDTY SM15T12CAY BDTY
SM15T15AY MDXY SM15T15CAY BDXY
SM15T18AY MEEY SM15T18CAY BEEY
SM15T22AY MEKY SM15T22CAY BEKY
SM15T24AY MEMY SM15T24CAY BEMY
SM15T27AY MEPY SM15T27CAY BEPY
SM15T30AY MERY SM15T30CAY BERY
SM15T33AY METY SM15T33CAY BETY
SM15T36AY MEVY SM15T36CAY BEVY
SM15T39AY MEXY SM15T39CAY BEXY
SM15T47AY MFAY SM15T47CAY BFAY
SM15T56AY MFBY SM15T56CAY BFBY
SM15T68AY MFPY SM15T68CAY BFPY
SM15T75AY MFOY SM15T75CAY BFOY
SM15T82AY MFRY SM15T82CAY BFRY
SM15TY Ordering information
Doc ID 17865 Rev 3 11/12
5 Ordering information
6 Revision history
Table 5. Ordering information
Order code Marking Package Weight Base qty Delivery mode
SM15TxxxAY/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 SMC 0.25 g 2500 Tape and reel
Table 6. Document revision history
Date Revision Changes
15-Sep-2010 1 Initial release.
09-Nov-2011 2
Added order codes in Table 2 and Table 4.
Updated Figure 5, 6, 7, and Table 1. Added Figure 11.
Deleted old Table 2. Thermal parameter. Updated ISO
10605, C = 150 pF - R = 330
Ω
: on page 1
27-Mar-2012 3 Added footnote on page 1.
SM15TY
12/12 Doc ID 17865 Rev 3
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