July 2010 Doc ID 5544 Rev 12 1/10
10
SMAJ
Transil™
Features
■Peak pulse power:
– 400 W (10/1000 µs)
– 2.3 kW (8/20 μs)
■Stand off voltage range: from 5 V to 188 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:
– 270 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 Table 3 for surge level)
■MIL STD 883G, method 3015-7 Class 3B
– 25 kV HBM (human body model)
■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 SMAJ 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 generally used against surges below
400 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.
SMAJ are packaged in SMA (SMA footprint in
accordance with IPC 7531 standard).
TM: Transil is a trademark of STMicroelectronics
K
A
Unidirectional Bidirectional
SMA
(JEDEC DO-214AC)
www.st.com
Characteristics SMAJ
2/10 Doc ID 5544 Rev 12
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) Tj initial = Tamb 400 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 resistances
Symbol Parameter Value Unit
Rth(j-l) Junction to leads 30 °C/W
Rth(j-a) Junction to ambient on printed circuit on recommended pad layout 120 °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
Repetitive pulse current
tr= rise time (µs)
tp= pulse duration time (µs)
trtp
SMAJ Characteristics
Doc ID 5544 Rev 12 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 (2)
10/1000 µs
VCL @IPP
8/20 µs
RD (2)
8/20 µs αT (3)
25 °C 85 °C min typ max max max
µA V V mA V A(4) ΩVA
(4) Ω10-4/° C
SMAJ5.0A/CA 20 50 5 6.4 6.74 10 9.2 43.5 0.049 13.4 174 0.036 5.7
SMAJ6.0A/CA 20 50 6 6.7 7.05 10 10.3 38.8 0.075 13.7 170 0.037 5.9
SMAJ6.5A/CA 20 50 6.5 7.2 7.58 10 11.2 35.7 0.091 14.5 160 0.041 6.1
SMAJ8.5A/CA 20 50 8.5 9.4 9.9 1 14.4 27.7 0.145 19.5 124 0.073 7.3
SMAJ10A/CA 0.2 1 10 11.1 11.7 1 17 23.5 0.201 21.7 106 0.089 7.8
SMAJ12A/CA 0.2 1 12 13.3 14 1 19.9 20.1 0.259 25.3 91 0.116 8.3
SMAJ13A/CA 0.2 1 13 14.4 15.2 1 21.5 18.6 0.298 27.2 85 0.132 8.4
SMAJ15A/CA 0.2 1 15 16.7 17.6 1 24.4 16.4 0.361 32.5 71 0.197 8.8
SMAJ18A/CA 0.2 1 18 20 21.1 1 29.2 13.7 0.514 39.3 59 0.291 9.2
SMAJ20A/CA 0.2 1 20 22.2 23.4 1 32.4 12.3 0.637 42.8 54 0.338 9.4
SMAJ22A/CA 0.2 1 22 24.4 25.7 1 35.5 11.2 0.760 48.3 48 0.444 9.6
SMAJ24A/CA 0.2 1 24 26.7 28.1 1 38.9 10.3 0.912 50 46 0.446 9.6
SMAJ26A/CA 0.2 1 26 28.9 30.4 1 42.1 9.5 1.07 53.5 43 0.502 9.7
SMAJ28A/CA 0.2 1 28 31.1 32.7 1 45.4 8.8 1.26 59 39 0.632 9.8
SMAJ30A/CA 0.2 1 30 33.3 35.1 1 48.4 8.3 1.39 64.3 36 0.762 9.9
SMAJ33A/CA 0.2 1 33 36.7 38.6 1 53.3 7.5 1.70 69.7 33 0.884 10
SMAJ40A/CA 0.2 1 40 44.4 46.7 1 64.5 6.2 2.49 84 27 1.30 10.1
SMAJ43A/CA 0.2 1 43 47.8 50.3 1 69.4 5.7 2.91 91 25 1.53 10.2
SMAJ48A/CA 0.2 1 48 53.3 56.1 1 77.4 5.2 3.56 100 23 1.79 10.3
SMAJ58A/CA 0.2 1 58 64.4 67.8 1 93.6 4.3 5.21 121 19 2.62 10.4
SMAJ70A/CA 0.2 1 70 77.8 81.9 1 113 3.5 7.72 146 16 3.75 10.5
SMAJ85A/CA 0.2 1 85 94 99 1 137 2.9 11.4 178 13 5.70 10.6
SMAJ100A/CA 0.2 1 100 111 117 1 162 2.5 15.7 212 11 8.10 10.7
SMAJ130A/CA 0.2 1 130 144 152 1 209 1.9 26.0 265 9 11.7 10.8
SMAJ154A/CA 0.2 1 154 171 180 1 246 1.6 35.6 317 7 18.3 10.8
SMAJ170A/CA 0.2 1 170 189 199 1 275 1.4 47.2 353 6.5 22.2 10.8
SMAJ188A/CA 0.2 1 188 209 220 1 328 1.4 69.3 388 6 26.2 10.8
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 SMAJ
4/10 Doc ID 5544 Rev 12
Figure 5. Clamping voltage versus peak pulse current (exponential waveform, maximum values)
Figure 3. Peak pulse power dissipation
versus initial junction temperature
Figure 4. Peak pulse power versus
exponential pulse duration
(Tj initial = 25° C)
0
100
200
300
400
500
0 25 50 75 100 125 150 175
Ppp (W)
Tj(°C)
0.1
1.0
10.0
1.
0
E-
03
1.
0
E-
0
21.
0
E-
0
11.
0
E+
00
1.
0
E+
0
1
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
10/1000 µs
Tjinitial=25 °C
8/20 µs
10 ms
SMAJ5.0A
SMAJ12A
SMAJ24A
SMAJ40A
SMAJ85A
SMAJ188A
IPP(A)
VCL
(V)
SMAJ Characteristics
Doc ID 5544 Rev 12 5/10
Figure 6. Junction capacitance versus
reverse applied voltage for
unidirectional types (typical values)
Figure 7. Junction capacitance versus
reverse applied voltage for
bidirectional types (typical values)
10
100
1000
10000
1 10 100 1000
C(pF)
F=1 MHz
V
OSC
=30 mV
RMS
T
j
=25 °C
SMAJ5.0A
SMAJ12A
SMAJ24A
SMAJ40A
SMAJ85A
SMAJ188A
V
R
(V)
10
100
1000
10000
1 10 100 1000
C(pF)
F=1 MHz
VOSC=30 mVRMS
Tj=25 °C
SMAJ5.0CA
SMAJ12CA
SMAJ24CA
SMAJ40CA
SMAJ85CA
SMAJ188CA
V
R
(V)
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)
I
FM
(A)
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 3.5
Tj=25 °C
Tj=125 °C
VFM(V)
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
PCB FR4, copper thickness = 35 µm
tP(s)
R (°C/W)
th(j-a)
0
10
20
30
40
50
60
70
80
90
100
110
120
130
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
SCU(cm²)
PCB FR4, copper thickness = 35 µm
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 ≥10 V
VR=VRM
VRM <10V
Tj(°C)
Ordering information scheme SMAJ
6/10 Doc ID 5544 Rev 12
2 Ordering information scheme
Figure 12. Ordering information scheme
SM A J 85 CA - TR
Surface mount
Peak pulse power
A = 400 W Transil in SMA
Stand off voltage
85 = 85 V
Type
A = Unidirectinal
CA = Bidirectional
Delivery mode
TR = Tape and reel
SMAJ Package information
Doc ID 5544 Rev 12 7/10
3 Package information
●Case: JEDEC DO-214AC 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
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. SMA dimensions
Ref.
Dimensions
Millimeters Inches
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
Figure 13. Footprint dimensions in mm
(inches)
Figure 14. Marking layout(1)
1. Marking layout can vary according to assembly location.
E
CL
E1
D
A1
A2
b
2.63
(0.103)
5.43
(0.214)
1.4
1.64
(0.064)
1.4
(0.055) (0.055)
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 SMAJ
8/10 Doc ID 5544 Rev 12
Table 5. Marking
Order code Marking Order code Marking
SMAJ5.0A-TR AE SMAJ5.0CA-TR AA
SMAJ6.0A-TR DUB SMAJ6.0CA-TR DBB
SMAJ6.5A-TR DUC SMAJ6.5CA-TR DBC
SMAJ8.5A-TR DUH SMAJ8.5CA-TR DBH
SMAJ10A-TR AX SMAJ10CA-TR AC
SMAJ12A-TR DUK SMAJ12CA-TR DBK
SMAJ13A-TR BG SMAJ13CA-TR BH
SMAJ15A-TR BM SMAJ15CA-TR AJ
SMAJ18A-TR DUQ SMAJ18CA-TR DBQ
SMAJ20A-TR DUR SMAJ20CA-TR DBR
SMAJ22A-TR DUS SMAJ22CA-TR DBS
SMAJ24A-TR DUT SMAJ24CA-TR DBT
SMAJ26A-TR DUU SMAJ26CA-TR DBU
SMAJ28A-TR CG SMAJ28CA-TR CH
SMAJ30A-TR CK SMAJ30CA-TR CL
SMAJ33A-TR CM SMAJ33CA-TR CN
SMAJ40A-TR DUZ SMAJ40CA-TR DBZ
SMAJ43A-TR EUA SMAJ43CA-TR EBA
SMAJ48A-TR CX SMAJ48CA-TR CY
SMAJ58A-TR EUF SMAJ58CA-TR EBF
SMAJ70A-TR EUI SMAJ70CA-TR EBI
SMAJ85A-TR EUL SMAJ85CA-TR EBL
SMAJ100A-TR EUN SMAJ100CA-TR EBN
SMAJ130A-TR EUQ SMAJ130CA-TR EBQ
SMAJ154A-TR EUT SMAJ154CA-TR EBT
SMAJ170A-TR SR SMAJ170CA-TR SS
SMAJ188A-TR EUV SMAJ188CA-TR EBV
SMAJ Ordering information
Doc ID 5544 Rev 12 9/10
4 Ordering information
5 Revision history
Table 6. Ordering information
Order code Marking Package Weight Base qty Delivery mode
SMAJxxxA/CA-TR(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 SMA 0.071 g 5000 Tape and reel
Table 7. Document revision history
Date Revision Changes
September-1998 5B Previous update.
02-Aug-2004 6 SMA package dimensions update. Reference A1 max. changed
from 2.70mm (0.106) to 2.03mm (0.080).
10-Dec-2004 7 Template layout update. No content change.
10-Feb-2006 8 Added unidirectional marking on cover page and Figure 14.
Changed Figure 13. Foot print.
14-May-2009 9 Updated ECOPACK statement. Reformatted to current
standards.
17-Sep-2009 10 Document updated for low leakage current.
05-Nov-2009 11 Corrected typographical error in Package information.
09-Jul-2010 12 Changed timescale in Figure 9.
SMAJ
10/10 Doc ID 5544 Rev 12
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