®
SMAJ
TRANSIL™
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 TRANSIL
TM
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
(T
amb
= 25°C)
Symbol
P
PP
P
I
FSM
T
stg
T
j
T
L
Parameter
Peak pulse power dissipation (see note
1
)
Power dissipation on infinite heatsink
Non repetitive surge peak forward
current for unidirectional types
Storage temperature range
Maximum junction temperature
Maximum lead temperature for soldering during 10 s.
A
K
Unidirectional
Bidirectional
SMA
(JEDEC DO-214AC)
Table 1: Order Codes
Part Number
SMAJxxxA-TR
SMAJxxxCA-TR
Marking
See page 2
See page 2
Value
T
j
initial = T
amb
T
amb
= 50°C
t
p
= 10 ms
T
j
initial = T
amb
400
3.3
40
-65 to 175
150
260
Unit
W
W
A
°C
°C
Note 1:
for a surge greater than the maximum values, the diode will fail in short-circuit.
Table 3: Thermal Resistances
Symbol
Parameter
Rth(j-l) Junction to leads
Rth(j-a) Junction to ambient on printed circuit on recommended pad layout
Value
30
120
Unit
°C/W
°C/W
February 2006
REV. 8
1/6
SMAJ
Table 4: Electrical Characteristics
(T
amb
= 25°C)
Symbol
V
RM
V
BR
V
CL
I
RM
I
PP
αT
V
F
Parameter
Stand-off voltage
I
F
I
I
I
PP
Breakdown voltage
Clamping voltage
V
CL
V
BR
V
RM
V
F
I
RM
I
R
V
Leakage current
Peak pulse current
Voltage temperature
coefficient
Forward voltage drop
V
CL
V
BR
V
RM
I
R
I
RM
I
RM
I
R
V
V
RM
V
BR
V
CL
I
PP
Unidirectional
I
PP
Bidirectional
Types
Unidirectional
SMAJ5.0A-TR
SMAJ6.0A-TR
SMAJ6.5A-TR
SMAJ8.5A-TR
SMAJ10A-TR
SMAJ12A-TR
SMAJ13A-TR
SMAJ15A-TR
SMAJ18A-TR
SMAJ20A-TR
SMAJ22A-TR
SMAJ24A-TR
SMAJ26A-TR
SMAJ28A-TR
SMAJ30A-TR
SMAJ33A-TR
SMAJ40A-TR
SMAJ43A-TR
SMAJ48A-TR
SMAJ58A-TR
SMAJ70A-TR
SMAJ85A-TR
SMAJ100A-TR
SMAJ130A-TR
SMAJ154A-TR
SMAJ170A-TR
SMAJ188A-TR
Note 2:
Note 3:
Note 4:
I
RM
@ V
RM
V
BR
@ I
R
V
CL
@ I
PP
V
CL
@ I
PP
max
min
max
max
note2
10/1000µs
8/20µs
Mark.
AA
DBB
DBC
DBH
AC
DBK
BH
AJ
DBQ
DBR
DBS
DBT
DBU
CH
CL
CN
DBZ
EBA
CY
EBF
EBI
EBL
EBN
EBQ
EBT
SS
EBV
µA
800
800
500
10
5
5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
V
5.0
6.0
6.5
8.5
10
12
13
15
18
20
22
24
26
28
30
33
40
43
48
58
70
85
100
130
154
170
188
V
6.4
6.7
7.2
9.44
11.1
13.3
14.4
16.7
20
22.2
24.4
26.7
28.9
31.1
33.3
36.7
44.4
47.8
53.3
64.4
77.8
94.4
111
144
171
189
209
mA
10
10
10
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
V
9.2
10.3
11.2
14.4
17
19.9
21.5
24.4
29.2
32.4
35.5
38.9
42.1
45.4
48.4
53.3
64.5
69.4
77.4
93.6
113
137
162
209
246
275
328
A
43.5
38.8
35.7
27.7
23.5
20.1
18.6
16.4
13.7
12.3
11.2
10.3
9.5
8.8
8.3
7.5
6.2
5.7
5.2
4.3
3.5
2.9
2.5
1.9
1.6
1.4
1.4
V
13.4
13.7
14.5
18.6
21.7
25.3
27.2
32.5
39.3
42.8
48.3
50
53.5
59
64.3
69.7
84
91
100
121
146
178
212
265
317
353
388
A
α
T
max
note3
C
typ
note4
pF
3500
3300
3100
2000
1550
1325
1200
975
800
725
625
600
575
510
480
450
370
350
320
270
230
200
170
145
125
120
110
Mark.
AE
DUB
DUC
DUH
AX
DUK
BG
BM
DUQ
DUR
DUS
DUT
DUU
CG
CK
CM
DUZ
EUA
CX
EUF
EUI
EUL
EUN
EUQ
EUT
SR
EUV
Bidirectional
SMAJ5.0CA-TR
SMAJ6.0CA-TR
SMAJ6.5CA-TR
SMAJ8.5CA-TR
SMAJ10CA-TR
SMAJ12CA-TR
SMAJ13CA-TR
SMAJ15CA-TR
SMAJ18CA-TR
SMAJ20CA-TR
SMAJ22CA-TR
SMAJ24CA-TR
SMAJ26CA-TR
SMAJ28CA-TR
SMAJ30CA-TR
SMAJ33CA-TR
SMAJ40CA-TR
SMAJ43CA-TR
SMAJ48CA-TR
SMAJ58CA-TR
SMAJ70CA-TR
SMAJ85CA-TR
SMAJ100CA-TR
SMAJ130CA-TR
SMAJ154CA-TR
SMAJ170CA-TR
SMAJ188CA-TR
10
-4
/°C
174
5.7
170
5.9
160
6.1
124
7.3
106
7.8
91
8.3
85
8.4
71
8.8
59
9.2
54
9.4
48
9.6
46
9.6
43
9.7
39
9.8
36
9.9
33
10.0
27
10.1
25
10.2
23
10.3
19
10.4
16
10.5
13
10.6
11
10.7
9
10.8
7
10.8
6.5
10.8
6
10.8
∆
VBR =
α
T * (Tamb - 25) * VBR(25°C).
V
R
= 0 V, F = 1 MHz. For bidirectional types, capacitance value is divided by 2.
Pulse test : t
p
< 50 ms.
2/6
SMAJ
Figure 1: Pulse waveform (10/1000µs)
Figure 2: Peak power dissipation versus initial
junction temperature
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
Ppp[Tj initial]/Ppp[Tj initial=25°C]
Tj initial(°C)
0
25
50
75
100
125
150
175
Figure 3: Peak pulse power versus exponential
pulse duration (Tj initial=25°C)
Ppp(W)
5000
Figure 4: Clamping voltage versus peak pulse
current (Tj initial=25°C)
Exponential waveform tp=20ms & tp=1ms
200.0
100.0
Ipp(A)
SMAJ5.0A,CA
SMAJ13A,CA
tp = 20 µs
tp = 1 ms
SMAJ26A,CA
1000
10.0
tp=1ms
SMAJ58A,CA
SMAJ188A,CA
1.0
tp(ms)
100
0.01
0.10
1.00
10.00
V
CL
(V)
0.1
1
10
100
500
Figure 5: Capacitance versus reverse applied
voltage (typical values) (SMAJxxA)
5000
C(pF)
F=1MHz
SMAJ5.0A
Figure 6: Capacitance versus reverse applied
voltage (typical values) (SMAJxxCA)
2000
1000
C(pF)
SMAJ5.0CA
F=1MHz
1000
SMAJ13A
SMAJ26A
SMAJ58A
SMAJ13CA
100
SMAJ26CA
SMAJ58CA
SMAJ188CA
100
SMAJ188A
10
V
R
(V)
10
1
10
100 200
1
1
V
R
(V)
10
100 200
3/6
SMAJ
Figure 7: Peak forward voltage drop versus
peak forward current (typical values)
10.00
I
FM
(A)
Figure 8: Relative variation of thermal
impedance junction to ambient versus pulse
duration
1.00
Zth(j-a)/Rth(j-a)
1.00
Tj=125°C
0.10
0.10
Tj=25°C
V
FM
(V)
0.01
0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4
0.01
1E-2
tp(s)
1E-1
1E+0
1E+1
1E+2 5E+2
Figure 9: Thermal resistance junction to
ambient versus copper surface under each
lead (printed circuit board FR4 e(Cu)=35µm)
140
130
120
110
100
90
80
70
60
50
40
Rth(j-a) (°C/W)
Figure 10: Relative variation of leakage current
versus junction temperature
I
R
[Tj] / I
R
[Tj=25°C]
2E+3
1E+3
V
BR
≥
8.5V
1E+2
1E+1
1E+0
S(Cu)(cm²)
0
1
2
3
4
5
V
BR
< 8.5V
Tj(°C)
1E-1
0
25
50
75
100
125
150
Figure 11: Ordering Information Scheme
SM
Surface Mount
Peak Pulse Power
A = 400 W
Stand off voltage
85 = 85 V
Type
A = Unidirectinal
CA = Bidirectional
Packaging
TR = Tape & reel
A
J
85
CA
-
TR
4/6
SMAJ
Figure 12: SMA Package Mechanical Data
E1
REF.
Min.
D
DIMENSIONS
Millimeters
Max.
2.03
0.20
1.65
0.41
5.60
4.60
2.95
1.60
Inches
Min.
0.075
0.002
0.049
0.006
0.189
0.156
0.089
0.030
Max.
0.080
0.008
0.065
0.016
0.220
0.181
0.116
0.063
A1
A2
b
1.90
0.05
1.25
0.15
4.80
3.95
2.25
0.75
E
c
E
A1
E1
D
b
C
L
A2
L
Figure 13: Foot print dimensions (millimeters)
1.73
1.48
1.73
Figure 14: Marking
Cathode bar ( unidirectional devices only )
e3
1.67
4.94
x x x
z y ww
E : ECOPACK ( Leadfree ) mention
XXX : Marking
Z : Manufacturing location
Y : Year
WW : week
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
SMAJxxxA-TR
SMAJxxxCA-TR
Marking
See page 2
See page 2
Package
SMA
SMA
Weight
0.068 g
0.068 g
Base qty
5000
5000
Delivery mode
Tape & reel
Tape & reel
Table 6: Revision History
Date
September-1998
02-Aug-2004
10-Dec-2004
10-Feb-2006
Revision
5B
6
7
8
Description of Changes
Previous update.
SMA package dimensions update. Reference A1 max.
changed from 2.70mm (0.106inc.) to 2.03mm (0.080).
Template layout update. No content change.
Added unidirectional marking on cover page and
Figure 14. Changed Figure 13. Foot print.
5/6
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