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SMAJ
TRANSIL™
REV. 8
KKKKKKKK
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Unidirectional Bidirectional
SMA
(JEDEC DO-214AC)
February 2006
FEATURES
■Peak Pulse Power : 400 W (10/1000µs)
■Stand off voltage range:
From 5V to 188V
■Uni and Bidirectional types
■Low clamping factor
■Fast response time
■JEDEC registered package outline
DESCRIPTION
The SMAJ series are TRANSILTM diodes de-
signed specifically for protecting sensitive equip-
ment against transient overvoltages. The SMA
package allows save spacing on high density
printed circuit boards.
Transil diodes provide high overvoltage protection
by clamping action. Their instantaneous response
to transient overvoltages makes them particularly
suited to protect voltage sensitive devices such as
MOS Technology and low voltage supplied IC’s.
Table 2: Absolute Maximum Rating (Tamb = 25°C)
Table 3: Thermal Resistances
Symbol Parameter Value Unit
PPP Peak pulse power dissipation (see note 1) Tj initial = Tamb 400 W
PPower dissipation on infinite heatsink Tamb = 50°C 3.3 W
IFSM Non repetitive surge peak forward
current for unidirectional types
tp = 10 ms
Tj initial = Tamb 40 A
Tstg
Tj
Storage temperature range
Maximum junction temperature
-65 to 175
150 °C
TLMaximum lead temperature for soldering during 10 s. 260 °C
Note 1: for a surge greater than the maximum values, the diode will fail in short-circuit.
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
Table 1: Order Codes
Part Number Marking
SMAJxxxA-TR See page 2
SMAJxxxCA-TR See page 2
SMAJ
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Table 4: Electrical Characteristics
(Tamb = 25°C)
Note 2: Pulse test : tp < 50 ms.
Note 3: ∆VBR = αT * (Tamb - 25) * VBR(25°C).
Note 4: VR = 0 V, F = 1 MHz. For bidirectional types, capacitance value is divided by 2.
Symbol Parameter
VRM Stand-off voltage
VBR Breakdown voltage
VCL Clamping voltage
IRM Leakage current
IPP Peak pulse current
αT Voltage temperature
coefficient
VFForward voltage drop
Types
IRM @ VRM VBR @ IRVCL @ IPP VCL @ IPP αTC
max min
note2
max
10/1000µs
max
8/20µs
max
note3
typ
note4
Unidirectional Mark. Bidirectional Mark. µA V V mA V A V A 10-4/°C pF
SMAJ5.0A-TR AE SMAJ5.0CA-TR AA 800 5.0 6.4 10 9.2 43.5 13.4 174 5.7 3500
SMAJ6.0A-TR DUB SMAJ6.0CA-TR DBB 800 6.0 6.7 10 10.3 38.8 13.7 170 5.9 3300
SMAJ6.5A-TR DUC SMAJ6.5CA-TR DBC 500 6.5 7.2 10 11.2 35.7 14.5 160 6.1 3100
SMAJ8.5A-TR DUH SMAJ8.5CA-TR DBH 10 8.5 9.44 1 14.4 27.7 18.6 124 7.3 2000
SMAJ10A-TR AX SMAJ10CA-TR AC 5 10 11.1 1 17 23.5 21.7 106 7.8 1550
SMAJ12A-TR DUK SMAJ12CA-TR DBK 5 12 13.3 1 19.9 20.1 25.3 91 8.3 1325
SMAJ13A-TR BG SMAJ13CA-TR BH 1 13 14.4 1 21.5 18.6 27.2 85 8.4 1200
SMAJ15A-TR BM SMAJ15CA-TR AJ 1 15 16.7 1 24.4 16.4 32.5 71 8.8 975
SMAJ18A-TR DUQ SMAJ18CA-TR DBQ 1 18 20 1 29.2 13.7 39.3 59 9.2 800
SMAJ20A-TR DUR SMAJ20CA-TR DBR 1 20 22.2 1 32.4 12.3 42.8 54 9.4 725
SMAJ22A-TR DUS SMAJ22CA-TR DBS 1 22 24.4 1 35.5 11.2 48.3 48 9.6 625
SMAJ24A-TR DUT SMAJ24CA-TR DBT 1 24 26.7 1 38.9 10.3 50 46 9.6 600
SMAJ26A-TR DUU SMAJ26CA-TR DBU 1 26 28.9 1 42.1 9.5 53.5 43 9.7 575
SMAJ28A-TR CG SMAJ28CA-TR CH 1 28 31.1 1 45.4 8.8 59 39 9.8 510
SMAJ30A-TR CK SMAJ30CA-TR CL 1 30 33.3 1 48.4 8.3 64.3 36 9.9 480
SMAJ33A-TR CM SMAJ33CA-TR CN 1 33 36.7 1 53.3 7.5 69.7 33 10.0 450
SMAJ40A-TR DUZ SMAJ40CA-TR DBZ 1 40 44.4 1 64.5 6.2 84 27 10.1 370
SMAJ43A-TR EUA SMAJ43CA-TR EBA 1 43 47.8 1 69.4 5.7 91 25 10.2 350
SMAJ48A-TR CX SMAJ48CA-TR CY 1 48 53.3 1 77.4 5.2 100 23 10.3 320
SMAJ58A-TR EUF SMAJ58CA-TR EBF 1 58 64.4 1 93.6 4.3 121 19 10.4 270
SMAJ70A-TR EUI SMAJ70CA-TR EBI 1 70 77.8 1 113 3.5 146 16 10.5 230
SMAJ85A-TR EUL SMAJ85CA-TR EBL 1 85 94.4 1 137 2.9 178 13 10.6 200
SMAJ100A-TR EUN SMAJ100CA-TR EBN 1 100 111 1 162 2.5 212 11 10.7 170
SMAJ130A-TR EUQ SMAJ130CA-TR EBQ 1 130 144 1 209 1.9 265 9 10.8 145
SMAJ154A-TR EUT SMAJ154CA-TR EBT 1 154 171 1 246 1.6 317 7 10.8 125
SMAJ170A-TR SR SMAJ170CA-TR SS 1 170 189 1 275 1.4 353 6.5 10.8 120
SMAJ188A-TR EUV SMAJ188CA-TR EBV 1 188 209 1 328 1.4 388 6 10.8 110
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
VCLVBR VRM
IRM
IR
IPP
V
I
IF
VF
VCLVBR VRM
IRM
IR
IPP
V
I
IF
VF
Unidirectional Bidirectional
SMAJ
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Figure 1: Pulse waveform (10/1000µs) Figure 2: Peak power dissipation versus initial
junction temperature
Figure 3: Peak pulse power versus exponential
pulse duration (Tj initial=25°C)
Figure 4: Clamping voltage versus peak pulse
current (Tj initial=25°C)
Exponential waveform tp=20ms & tp=1ms
Figure 5: Capacitance versus reverse applied
voltage (typical values) (SMAJxxA)
Figure 6: Capacitance versus reverse applied
voltage (typical values) (SMAJxxCA)
0 25 50 75 100 125 150 175
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1 Ppp[Tj initial]/Ppp[Tj initial=25°C]
Tj initial(°C)
0.01 0.10 1.00 10.00
100
1000
5000
Ppp(W)
tp(ms)
1 10 100 500
0.1
1.0
10.0
100.0
200.0 Ipp(A)
tp = 20 µs
tp = 1 ms
tp=1ms
SMAJ5.0A,CA
SMAJ188A,CA
SMAJ58A,CA
SMAJ26A,CA
SMAJ13A,CA
V(V)
CL
1 10 100 200
10
100
1000
5000 C(pF)
F=1MHz
SMAJ5.0A
SMAJ188A
SMAJ58A
SMAJ26A
SMAJ13A
V(V)R
1 10 100 200
1
10
100
1000
2000
F=1MHz
SMAJ5.0CA
SMAJ188CA
SMAJ58CA
SMAJ26CA
SMAJ13CA
C(pF)
V(V)R
SMAJ
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Figure 11: Ordering Information Scheme
Figure 7: Peak forward voltage drop versus
peak forward current (typical values)
Figure 8: Relative variation of thermal
impedance junction to ambient versus pulse
duration
Figure 9: Thermal resistance junction to
ambient versus copper surface under each
lead (printed circuit board FR4 e(Cu)=35µm)
Figure 10: Relative variation of leakage current
versus junction temperature
0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4
0.01
0.10
1.00
10.00 I (A)
FM
Tj=25°C
Tj=125°C
V (V)
FM
1E-2 1E-1 1E+0 1E+1 1E+2 5E+2
0.01
0.10
1.00 Zth(j-a)/Rth(j-a)
tp(s)
012345
40
50
60
70
80
90
100
110
120
130
140 Rth(j-a) (°C/W)
S(Cu)(cm²)
0 25 50 75 100 125 150
1E-1
1E+0
1E+1
1E+2
1E+3
2E+3
I [Tj] / I [Tj=25°C]RR
V < 8.5VBR
Tj(°C)
V 8.5VBR ≥
SM A J 85 CA - TR
Surface Mount
Peak Pulse Power
Stand off voltage
Type
Packaging
A = 400 W
85 = 85 V
A = Unidirectinal
CA = Bidirectional
TR = Tape & reel
SMAJ
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Figure 12: SMA Package Mechanical Data
Figure 13: Foot print dimensions (millimeters) Figure 14: Marking
E
CL
E1
D
A1
A2
b
1.67
4.94
1.73 1.48 1.73
y w w
e3
z
x x x
E : ECOPACK (Leadfree ) mention
XXX : Marking
Z : Manufacturing location
Y : Year
WW : week
Cathode bar ( unidirectional devices only )
REF. DIMENSIONS
Millimeters Inches
Min. Max. Min. Max.
A1 1.90 2.03 0.075 0.080
A2 0.05 0.20 0.002 0.008
b 1.25 1.65 0.049 0.065
c 0.15 0.41 0.006 0.016
E 4.80 5.60 0.189 0.220
E1 3.95 4.60 0.156 0.181
D 2.25 2.95 0.089 0.116
L 0.75 1.60 0.030 0.063
In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These
packages have a Lead-free second level interconnect . The category of second level interconnect is
marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The
maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an
ST trademark. ECOPACK specifications are available at: www.st.com.
Table 5: Ordering Information
Part Number Marking Package Weight Base qty Delivery mode
SMAJxxxA-TR See page 2 SMA 0.068 g 5000 Tape & reel
SMAJxxxCA-TR See page 2 SMA 0.068 g 5000 Tape & reel
Table 6: Revision History
Date Revision Description of Changes
September-1998 5B Previous update.
02-Aug-2004 6 SMA package dimensions update. Reference A1 max.
changed from 2.70mm (0.106inc.) 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.
SMAJ
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of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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