SM4TY
Automotive 400 W Transil™
Datasheet - production data
Complies with the following standards
• ISO 10605, C = 150 pF, R = 330 Ω:
– 30 kV (air discharge)
– 30 kV (contact discharge)
A
• ISO 10605, C = 330 pF, R = 330 Ω:
– 30 kV (air discharge)
– 30 kV (contact discharge)
K
Unidirectional
Bidirectional
• ISO 7637-2(a)
– pulse 1: VS = -100 V
– pulse 2a: VS = +50 V
– pulse 3a: VS = -150 V
– pulse 3b: VS = +100 V
SMA
(JEDEC DO-214AC)
Features
Description
• Peak pulse power:
– 400 W (10/1000 µs)
– 2.3 kW (8/20 µs)
The SM4TY 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.
• Stand-off voltage range: from 5 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
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. SM4TY devices
are packaged in SMA (SMA footprint in
accordance with IPC 7531 standard).
• High power capability at Tjmax:
– 270 W (10/1000 µs)
• JEDEC registered package outline
• Resin meets UL 94, V0
• AEC-Q101 qualified
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)
October 2015
This is information on a product in full production.
DocID17862 Rev 4
1/12
www.st.com
Characteristics
1
SM4TY
Characteristics
Table 1. Absolute maximum ratings (Tamb = 25 °C)
Symbol
Parameter
Value
ISO 10605 (C = 150 pF, R = 330 Ω)
Contact discharge
Air discharge
VPP
Peak pulse voltage
30
30
kV
ISO 10605, C = 330 pF, R = 330 Ω:
Contact discharge
Air discharge
PPP
Peak pulse power dissipation(1)
Tstg
Unit
30
30
Tj initial = Tamb
400
W
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
1. For a surge greater than the maximum values, the diode will fail in short-circuit.
Figure 1. Electrical characteristics - definitions
Symbol
VRM
VBR
VCL
IRM
IPP
αT
VF
RD
Parameter
Stand-off voltage
Breakdown voltage
Clamping voltage
Leakage current @ VRM
Peak pulse current
Voltage temperature coefficient
Forward voltage drop
Dynamic resistance
Unidirectional
I
I
IF
IPP
VF
VCL VBR VRM
V
VCLVBR VRM
IR
IRM
V
IRM
IR
IRM
IR
IPP
IPP
Figure 2. Pulse definition for electrical characteristics
%IPP
100
Pulse waveform
tr = rise time (µs)
tp = pulse duration time (µs)
50
0
2/12
tr
tp
DocID17862 Rev 4
t
VRMVBR VCL
Bidirectional
SM4TY
Characteristics
Table 2. Electrical characteristics, typical values if not otherwise stated (Tamb = 25 °C)
Order code
25 °C 85 °C
µA
RD
VCL @ IPP
V @ IPP
10/1000 CL
10/1000 µs
8/20 µs
µs
VBR @ IR (1)
IRM max @ VRM
min. typ. max.
V
V
max.
RD
8/20
µs
max.
mA
V(3)
A(4)
Ω
V(3)
αT (2)
max
A(4)
Ω
10-4/
°C
SM4T6V7AY/CAY
20
50
5
6.4
6.74
7.1
10
9.2
43.5
0.049
13.4 174 0.036
5.7
SM4T7V6AY/CAY
20
50
6.5
7.2
7.58
8.0
10
11.2 35.7
0.091
14.5 160 0.041
6.1
SM4T10AY/CAY
20
50
8.5
9.4
9.9
10.4
1
14.4 27.7
0.145
19.5 124 0.073
7.3
SM4T12AY/CAY
0.2
1
10
11.1 11.7
12.3
1
17.0 23.5
0.201
21.7 106 0.089
7.8
SM4T14AY/CAY
0.2
1
12
13.3 14.0 14.7
1
19.9 20.1
0.259
25.3
91
0.116
8.3
SM4T15AY/CAY
0.2
1
13
14.4 15.2 16.0
1
21.5 18.6
0.298
27.2
85
0.132
8.4
SM4T18AY/CAY
0.2
1
15
16.7 17.6 18.5
1
24.4 16.4
0.361
32.5
71
0.197
8.8
SM4T21AY/CAY
0.2
1
18
20.0 21.1 22.2
1
29.2 13.7
0.514
39.3
59
0.291
9.2
SM4T23AY/CAY
0.2
1
20
22.2 23.4 24.6
1
32.4 12.3
0.637
42.8
54
0.338
9.4
SM4T26AY/CAY
0.2
1
22
24.4 25.7 27.0
1
35.5 11.2
0.760
48.3
48
0.444
9.6
SM4T28AY/CAY
0.2
1
24
26.7 28.1 29.5
1
38.9 10.3
0.912
50
46
0.446
9.6
SM4T30AY/CAY
0.2
1
26
28.9 30.4 31.9
1
42.1
9.5
1.07
53.5
43
0.502
9.7
SM4T33AY/CAY
0.2
1
28
31.1 32.7 34.3
1
45.4
8.8
1.26
59
39
0.632
9.8
SM4T35AY/CAY
0.2
1
30
33.3 35.1 36.9
1
48.4
8.3
1.39
64.3
36
0.762
9.9
SM4T39AY/CAY
0.2
1
33
36.7 38.6 40.5
1
53.3
7.5
1.70
69.7
33
0.884
10
SM4T47AY/CAY
0.2
1
40
44.4 46.7 49.0
1
64.5
6.2
2.49
84
27
1.30
10.1
SM4T50AY/CAY
0.2
1
43
47.8 50.3 52.8
1
69.4
5.7
2.91
91
25
1.53
10.2
SM4T56AY/CAY
0.2
1
48
53.3 56.1 58.9
1
77.4
5.2
3.56
100
23
1.79
10.3
SM4T68AY/CAY
0.2
1
58
64.4 67.8 71.2
1
93.6
4.3
5.21
121
19
2.62
10.4
SM4T82AY/CAY
0.2
1
70
77.8 81.9 86.0
1
113
3.5
7.72
146
16
3.75
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.
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12
Characteristics
SM4TY
Figure 3. Peak pulse power dissipation versus Figure 4. Peak pulse power versus exponential
initial junction temperature
pulse duration
(Tj initial = 25 °C)
PPP(W)
500
PPP(kW)
10.0
Pulse = 10/1000 µs
400
300
1.0
200
100
Tj(°C)
0
0
25
50
75
100
125
150
175
Figure 5. Clamping voltage versus peak pulse
current (exponential waveform, maximum
values)
IPP(A)
1000.0
tp(ms)
0.1
1.0E-03
1.0E-02
1.0E-01
1.0E+00
1.0E+01
Figure 6. Junction capacitance versus reverse
applied voltage for unidirectional types (typical
values)
10000
C(pF)
Tjinitial = 25 °C
F = 1 Mhz
VOSC = 30 mVRMS
Tj = 25 °C
100.0
SM4T6V7AY
1000
8/20 µs
10.0
1
10
SM4T82AY/CAY
0.1
SM4T30AY/CAY
SM4T6V7AY/CAY
1.0
SM4T30AY
10/1000 µs
100
SM4T82AY
VCL(V)
100
1000
Figure 7. Junction capacitance versus reverse
applied voltage for bidirectional types (typical
values)
10000
1
1000
10
100
1000
Figure 8. Relative variation of thermal
impedance, junction to ambient, versus pulse
duration
C(pF)
F = 1 Mhz
VOSC = 30 mVRMS
Tj = 25 °C
VR(V)
10
1.00
Zth(j-a)/Rth(j-a)
Recommended pad layout
Printed circuit board FR4,
copper thickness = 35 µm
SM4T6V7CAY
0.10
SM4T30CAY
100
SM4T82CAY
VR(V)
10
1
4/12
10
100
1000
tp(s)
0.01
1.0E-03
DocID17862 Rev 4
1.0E-02
1.0E-01
1.0E+00
1.0E+01
1.0E+02
1.0E+03
SM4TY
Characteristics
Figure 9. Thermal resistance junction to
ambient versus copper surface under each lead
130
Rth(j-a)(°C/W)
Figure 10. Leakage current versus junction
temperature (typical values)
1.E+03
120
IR(nA)
Printed circuit board FR4,
copper thickness = 35 µm
110
100
1.E+02
90
VR = VRM
VRM < 10 V
80
70
60
1.E+01
50
40
30
VR = VRM
VRM ≥ 10 V
1.E+00
20
10
SCu(cm²)
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Tj(°C)
1.E-01
5.0
25
50
75
100
125
150
Figure 11. Peak forward voltage drop versus peak forward current (typical values)
1.0E+02
IFM(A)
1.0E+01
Tj = 125 °C
1.0E+00
Tj = 25 °C
1.0E-01
VFM(V)
1.0E-02
0.0
0.5
1.0
1.5
2.0
DocID17862 Rev 4
2.5
3.0
3.5
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12
Characteristics
SM4TY
Figure 12. ISO7637-2 pulse 1 response (VS = -100 V)
Voltage (V)
Voltage
10
0
-10
-20
-30
SM4T39AY
-40
-50
-0.5
5
0.0
0.5
1.0
Time (ms)
1.5
2.0
SM4T39CAY
2.5
Current (A)
Current
0
SM4T39AY
0.0
SM4T39CAY
-10
-15
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
Time (ms)
Figure 13. ISO7637-2 pulse 2a response (VS = 50 V)
50
Voltage
Voltage (V)
40
SM4T39AY
30
SM4T39CAY
20
10
0
-51
4
-1
49
99
Time (µs)
149
199
249
Current (A)
Current
SM4T39AY
SM4T39CAY
0
-4
-51
-1
49
99
149
Time (µs)
6/12
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199
249
SM4TY
Characteristics
Figure 14. ISO7637-2 pulse 3a response (VS = -150 V)
Voltage (V)
30
Voltage
20
10
SM4T39AY
0
SM4T39CAY
-10
-20
-30
-40
-50
-60
-0.2
0.8
1.8
Time (µs)
0.0
0.0
0.0
0.5 Current (A)
Current
0
-0.5
SM4T39AY
-1
SM4T39CAY
-1.5
-2
-2.5
-0.2
0.8
0.0
1.8
0.0
0.0
Time (µs)
Figure 15. ISO7637-2 pulse 3b response (VS = 100 V)
50
Voltage (V)
Voltage
40
SM4T39AY
30
SM4T39CAY
20
10
0
-0.2
1.2
0.8
1.8
Time (µs)
Current (A)
Current
0.8
SM4T39AY
0.4
SM4T39CAY
0.0
-0.4
-0.2
0.8
1.8
Time (µs)
Note:
ISO7637-2 pulses responses are not applicable for product with a stand off voltage lower
than the average battery voltage (13.5 V).
DocID17862 Rev 4
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12
Application and design guidelines
2
SM4TY
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
SM
Surface mount
Surge rating
4 = 400 W Transil in SMA
Breakdown voltage
Types
CA = Bidirectional
A = Unidirectional
Automotive grade
8/12
DocID17862 Rev 4
4T
XX
CA
Y
SM4TY
4
Package information
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. SMA package dimensions
Dimensions
Ref.
Millimeters
Inches
E1
D
E
A1
A2
C
L
Min.
Max.
Min.
Max.
A1
1.90
2.45
0.075
0.094
A2
0.05
0.20
0.002
0.008
b
1.25
1.65
0.049
0.065
c
0.15
0.40
0.006
0.016
D
2.25
2.90
0.089
0.114
E
4.80
5.35
0.189
0.211
E1
3.95
4.60
0.156
0.181
L
0.75
1.50
0.030
0.059
b
Figure 17. SMA footprint dimensions in
mm (inches)
1.4
2.63
1.4
(0.055)
(0.104)
(0.055)
Figure 18. Marking layout(1)
Cathode bar (unidirectional devices only )
1.64
(0.064)
5.43
ECOPACK compliance
XXXX: Marking
x x x x
z y ww
Z: Manufacturing location
Y: Year
WW: week
(0.214)
1. Marking layout can vary according to assembly location.
DocID17862 Rev 4
9/12
12
Package information
SM4TY
Table 4. Marking
10/12
Order code
Marking
Order code
Marking
SM4T6V7AY
AEY
SM4T6V7CAY
AAY
SM4T7V6AY
DUCY
SM4T7V5CAY
DBCY
SM4T10AY
DUHY
SM4T10CAY
DBHY
SM4T12AY
AXY
SM4T12CAY
ACY
SM4T14AY
DUKY
SM4T14CAY
DBKY
SM4T15AY
BGY
SM4T15CAY
BHY
SM4T18AY
BMY
SM4T18CAY
AJY
SM4T21AY
DUQY
SM4T21CAY
DBQY
SM4T23AY
DURY
SM4T23CAY
DBRY
SM4T26AY
DUSY
SM4T26CAY
DBSY
SM4T28AY
DUTY
SM4T28CAY
DBTY
SM4T30AY
DUUY
SM4T30CAY
DBUY
SM4T33AY
CGY
SM4T33CAY
CHY
SM4T35AY
CKY
SM4T35CAY
CLY
SM4T39AY
CMY
SM4T39CAY
CNY
SM4T47AY
DUZY
SM4T47CAY
DBZY
SM4T50AY
EUAY
SM4T50CAY
EBAY
SM4T56AY
CXY
SM4T56CAY
CYY
SM4T68AY
EUFY
SM4T68CAY
EBFY
SM4T82AY
EUIY
SM4T82CAY
EBIY
DocID17862 Rev 4
SM4TY
5
Ordering information
Ordering information
Table 5. Ordering information
Order code
Marking
Package
Weight
Base qty
Delivery mode
SM4TxxxAY/CAY(1)
See Table 4 on page 10
SMA
0.072 g
5000
Tape and reel
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
6
Revision history
Table 6. Document revision history
Date
Revision
Changes
08-Sep-2010
1
Initial release.
09-Nov-2011
2
Added order codes in Table 2 and Table 4. Updated
Figure 5, 6 and 7.
27-Mar-2012
3
Added footnote on page 1.
05-Oct-2015
4
Updated Table 1.
DocID17862 Rev 4
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SM4TY
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improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on
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acknowledgement.
Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or
the design of Purchasers’ products.
No license, express or implied, to any intellectual property right is granted by ST herein.
Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.
ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners.
Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2015 STMicroelectronics – All rights reserved
12/12
DocID17862 Rev 4
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