Page 1
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 T
■ High power capability at T
– 270 W (10/1000 µs)
■ JEDEC registered package outline
j max
: 150 °C
j max
:
SMAJ
Transil™
A
K
Unidirectional Bidirectional
SMA
(JEDEC DO-214AC)
Description
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
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
July 2010 Doc ID 5544 Rev 12 1/10
www.st.com
10
Page 2
Characteristics SMAJ
1 Characteristics
Table 1. Absolute maximum ratings (T
= 25 °C)
amb
Symbol Parameter Value Unit
P
T
Peak pulse power dissipation
PP
Storage temperature range -65 to +150 °C
stg
Operating junction temperature range -55 to +150 °C
T
j
Maximum lead temperature for soldering during 10 s. 260 °C
T
L
1. For a surge greater than the maximum values, the diode will fail in short-circuit.
Table 2. Thermal resistances
(1)
Tj initial = T
amb
400 W
Symbol Parameter Value Unit
R
R
Junction to leads 30 °C/W
th(j-l)
Junction to ambient on printed circuit on recommended pad layout 120 °C/W
th(j-a)
Figure 1. Electrical characteristics - definitions
I
I
I
I
PP
PP
I
I
R
R
I
I
RM
RM
RM
RM
I
I
VRMVBRV
VRMVBRV
RM
RM
I
I
R
R
Bidirectional
I
I
PP
PP
V
V
CL
CL
Symbol Parameter
V Stand-off voltage
RM
V Breakdown voltage
BR
V Clamping voltage
CL
I Leakage current @ V
RM RM
I Peak pulse current
PP
T Voltage temperature coefficient
α
V Forward voltage drop
F
R Dynamic resistance
D
Unidirectional
VCLVBRV
VCLVBRV
I
I
I
I
F
F
V
V
V
F
V
RM
RM
F
I
I
RM
RM
I
I
R
R
I
I
PP
PP
VCLVBRV
VCLVBRV
Figure 2. Pulse definition for electrical characteristics
Repetitive pulse current
tr= rise time (µs)
tp= pulse duration time (µs)
t
t
p
r
2/10 Doc ID 5544 Rev 12
Page 3
SMAJ Characteristics
Table 3. Electrical characteristics - parameter values (T
Order code
VCL @IPP
I
RM
max@V
RM
VBR @IR
(1)
10/1000 µs
= 25 °C)
amb
(2)
RD
10/1000 µs
V
@IPP
CL
8/20 µs
(2)
RD
8/20 µs
25 °C 85 °C min typ max max max
µA V V mA V A
(4)
Ω VA
(4)
Ω 10-4/° C
αT
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
= V
2. To calculate maximum clamping voltage at other surge level,use the following formula: V
where I
3. To calculate V
V
@ TJ = V
BR
VCL @ TJ = V
4. Surge capability given for both directions for unidirectional and bidirectional types.
is the surge current in the application
PPappli
or VCL versus junction temperature, use the following formulas:
BR
@ 25°C x (1 + αT x (TJ – 25)),
BR
@ 25°C x (1 + αT x (TJ – 25))
CL
CLmax
- RD x (IPP - I
CL
PPappli)
(3)
Doc ID 5544 Rev 12 3/10
Page 4
Characteristics SMAJ
0E-03
0E-0
0E+00
Figure 3. Peak pulse power dissipation
Ppp(W)
500
400
300
200
100
0
0 25 50 75 100 125 150 175
versus initial junction temperature
Tj(°C)
Figure 4. Peak pulse power versus
exponential pulse duration
(T
initial = 25° C)
j
PPP(kW)
10.0
1.0
0.1
1.
1.0E-021.
tP(ms)
11.
Tjinitial = 25 °C
1.0E+01
Figure 5. Clamping voltage versus peak pulse current (exponential waveform, maximum values)
(A)
I
1000.0
PP
Tjinitial=25 °C
100.0
10.0
1.0
0.1
8/20 µs
10/1000 µs
10 ms
SMAJ5.0A
SMAJ12A
SMAJ24A
SMAJ40A
SMAJ85A
SMAJ188A
VCL(V)
1 10 100 1000
4/10 Doc ID 5544 Rev 12
Page 5
SMAJ Characteristics
Figure 6. Junction capacitance versus
reverse applied voltage for
unidirectional types (typical values)
C(pF)
10000
1000
100
10
1 10 100 1000
SMAJ5.0A
SMAJ12A
SMAJ24A
SMAJ40A
SMAJ85A
VR(V)
F=1 MHz
V
OSC
Tj=25 °C
SMAJ188A
=30 mV
Figure 8. Peak forward voltage drop
versus peak forward current
(typical values)
IFM(A)
1.0E+02
1.0E+01
Tj=125 °C
Figure 7. Junction capacitance versus
reverse applied voltage for
bidirectional types (typical values)
C(pF)
10000
RMS
1000
100
10
1 10 100 1000
SMAJ5.0CA
SMAJ12CA
SMAJ24CA
SMAJ40CA
VR(V)
V
SMAJ85CA
F=1 MHz
=30 mV
OSC
Tj=25 °C
SMAJ188CA
RMS
Figure 9. Relative variation of thermal
impedance, junction to ambient,
versus pulse duration
Z
th(j-a)/Rth(j-a)
1.00
Recommended pad layout
PCB FR4, copper thickness = 35 µm
1.0E+00
1.0E-01
Tj=25 °C
VFM(V)
1.0E-02
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
Figure 10. Thermal resistance, junction to
ambient, versus copper surface
under each lead
R (°C/W)
th(j-a)
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
PCB FR4, copper thickness = 35 µm
SCU(cm²)
0.10
0.01
1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03
tP(s)
Figure 11. Leakage current versus junction
temperature (typical values)
IR(nA)
1.E+03
VR=V
1.E+02
1.E+01
1.E+00
1.E-01
RM
VRM<10V
VR=V
RM
VRM≥ 10 V
25 50 75 100 125 150
Tj(°C)
Doc ID 5544 Rev 12 5/10
Page 6
Ordering information scheme SMAJ
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
6/10 Doc ID 5544 Rev 12
Page 7
SMAJ Package information
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
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
Table 4. SMA dimensions
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
Dimensions
Ref.
E1
Millimeters Inches
Min. Max. Min. Max.
D
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
E
A1
C
L
A2
b
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
Figure 14. Marking layout
(1)
(inches)
1.4
(0.055) (0.055)
2.63
(0.103)
5.43
(0.214)
1.4
1.64
(0.064)
1. Marking layout can vary according to assembly location.
Doc ID 5544 Rev 12 7/10
Cathode bar ( unidirectional devices only )
e: ECOPACK compliance
XXX: Marking
Z: Manufacturing location
Y: Year
WW: week
x x x
y w w
z
e
Page 8
Package information SMAJ
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
8/10 Doc ID 5544 Rev 12
Page 9
SMAJ Ordering information
4 Ordering information
Table 6. Ordering information
Order code Marking Package Weight Base qty Delivery mode
(1)
SMAJxxxA/CA-TR
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
5 Revision history
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
14-May-2009 9
Added unidirectional marking on cover page and Figure 14.
Changed Figure 13. Foot print.
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.
Doc ID 5544 Rev 12 9/10
Page 10
SMAJ
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