TVS Diodes
Surface Mount – 400W > SMAJ-E Series
SMAJ series
RoHS
SMAJ-E Series
Uni-directional
Description
Pb
e3
The SMAJ-E series is designed specifically to protect
sensitive electronic equipment from voltage transients
induced by lightning and other transient voltage events.
Features
• Excellent clamping
capability
• For surface mounted
applications to optimize
board space
• Low profile package
• Typical failure mode is
short from over-specified
voltage or current
• Whisker test is conducted
based on JEDEC
JESD201A per its table 4a
and 4c
• IEC-61000-4-2 ESD
30kV(Air), 30kV (Contact)
• ESD protection of data
lines in accordance with
IEC 61000-4-2
• EFT protection of data
lines in accordance with
IEC 61000-4-4
• Built-in strain relief
• 400W Peak pulse power
capability at 10/1000µs
waveform, repetition rate
(duty cycle): 0.01%
• Fast response time:
typically less than 1.0ps
from 0 Volts to V
BR
min
• Glass passivated junction
• Low inductance
• High temperature
to reflow soldering
guaranteed: 260°C/40sec
• V
BR
@ T
J
= V
BR
@25°C
x (1+
α
T x (T
J
- 25))
(
α
T:Temperature
Coefficient, typical value
is 0.1%)
• EPI silicon technology
• Meet MSL level1, per
J-STD-020C, LF maximun
peak of 260
°
C
• Matte tin lead–free Plated
• Halogen free and RoHS
compliant
• Pb-free E3 means 2nd
level interconnect is
Pb-free and the terminal
finish material is tin(Sn)
(IPC/JEDEC J-STD-
609A.01)
Maximum Ratings and Thermal Characteristics
(T
A
=25
O
C unless otherwise noted)
Parameter
Peak Pulse Power Dissipation at
T
A
=25ºC by 10/1000µs Waveform
(Fig.2)(Note 1), (Note 2)
Power Dissipation on Infinite Heat
Sink at T
L
=50
O
C
Peak Forward Surge Current, 8.3ms
Single Half Sine Wave (Note 3)
Maximum Instantaneous Forward
Voltage at 25A for Unidirectional
Only
Operating Temperature Range
Storage Temperature Range
Typical Thermal Resistance Junction
to Lead
Typical Thermal Resistance Junction
to Ambient
Symbol
P
PPM
P
D
I
FSM
V
F
T
J
T
STG
R
θJL
R
θJA
Value
400
3.3
60
3.5
-65 to 150
-65 to 175
30
120
Unit
W
W
A
V
°C
°C
°C/W
°C/W
Notes:
1. Non-repetitive current pulse, per Fig.4 and derated above T
J
(initial) =25ºC per Fig. 3.
2. Mounted on 5.0x5.0mm copper pad to each terminal.
3. Measured on 8.3ms single half sine wave or equivalent square wave for unidirectional
device only.
Functional Diagram
Bi-directional
Applications
TVS devices are ideal for the protection of I/O Interfaces,
V
CC
bus and other vulnerable circuits used in Telecom,
Computer, Industrial and Consumer electronic applications.
Cathode
Uni-directional
Anode
©2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/29/16
TVS Diodes
Surface Mount – 400W > SMAJ-E Series
SMAJ series
Electrical Characteristics
(T =25°C unless otherwise noted)
A
Part
Number
(Uni)
SMAJ300A-E
SMAJ350A-E
SMAJ400A-E*
SMAJ450A-E*
SMAJ500A-E*
SMAJ550A-E*
SMAJ600A-E*
SMAJ650A-E*
SMAJ700A-E*
SMAJ750A-E*
SMAJ850A-E*
Reverse
Stand off
Marking
Voltage V
R
(Volts)
XE
XG
XK
XM
XN
XP
XR
XS
XT
XU
XV
300
350
400
440
500
550
600
650
700
750
850
Breakdown
Voltage V
BR
(Volts) @ I
T
MIN
335.0
391.0
447
.0
492.0
558.0
614.0
670.0
726.0
782.0
837
.0
950.0
MAX
371.0
432.0
494.0
543.0
618.0
680.0
741.0
803.0
865.0
927
.0
1050.0
Test
Current
I
T
(mA)
1
1
1
1
1
1
1
1
1
1
1
Maximum
Maximum
Maximum
Clamping
Reverse
Peak Pulse
Voltage V
C
Leakage I
R
Current I
pp
@ I
pp
@ V
R
(A)
(V)
(µA)
486.0
567
.0
648.0
713.0
810.0
891.0
971.0
1052.0
1133.0
1213.0
1365.0
0.80
0.70
0.60
0.60
0.50
0.46
0.42
0.39
0.36
0.33
0.30
1
1
1
1
1
1
1
1
1
1
1
Note: for parts with * are still under development
I-V Curve Characteristics
Uni-directional
Vc V
BR
V
R
I
R
V
F
I
T
V
I
pp
P
PPM
V
R
V
BR
V
C
I
R
V
F
Peak Pulse Power Dissipation
-- Max power dissipation
Stand-off Voltage
-- Maximum voltage that can be applied to the TVS without operation
Breakdown Voltage
-- Maximum voltage that flows though the TVS at a specified test current (I
T
)
Clamping Voltage
-- Peak voltage measured across the TVS at a specified Ippm (peak impulse current)
Reverse Leakage Current
-- Current measured at V
R
Forward Voltage Drop for Uni-directional
©2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/29/16
TVS Diodes
Surface Mount – 400W > SMAJ-E Series
SMAJ series
Ratings and Characteristic Curves
(T =25°C unless otherwise noted)
A
Figure 1 - TVS Transients Clamping Waveform
Voltage Transients
Figure 2 - Peak Pulse Power Rating Curve
100
Voltage Across TVS
Voltage or Current
P
PPM
-Peak Pulse Power (kW)
TJ initial = Tamb
10
Current Through TVS
1
0.1
0.001
0.01
0.1
1
10
Time
t
d
-Pulse Width (ms)
Figure 3 - Peak Pulse Power Derating Curve
100
Peak Pulse Power (P
PP
) or Current (I
PP
)
Derating in Percentage %
80
60
40
20
0
Figure 4 - Pulse Waveform
150
I
PPM
- Peak Pulse Current, % I
RSM
tr=10µsec
Peak Value
IPPM
TJ=25°C
Pulse Width(td) is defined
as the point where the peak
current decays to 50% of IPPM
100
Half Value
IPPM
IPPM
2
( )
10/1000µsec. Waveform
as defined by R.E.A
50
0
25
50
75
100
125 150
T
J
- Initial Junction Temperature (ºC)
175
0
td
0
1.0
2.0
t-Time (ms)
3.0
4.0
Figure 5 - Typical Junction Capacitance
1000.00
Figure 6 - Typical Transient Thermal Impedance
1000
Transient Thermal Impedance (
°
C/W)
100.00
Cj (pF)
100
10
10.00
1
1.00
100
V
BR
- Reverse Breakdown Voltage (V)
1000
0.1
0.001
0.01
0.1
1
10
100
1000
T
P
- Pulse Duration (s)
©2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/29/16
TVS Diodes
Surface Mount – 400W > SMAJ-E Series
SMAJ series
Figure 7 - Maximum Non-Repetitive Forward Surge
Current Uni-Directional Only
70
IFSM
-
Peak Forward Surve Current (A)
Figure 8 - Peak Forward Voltage Drop vs Peak Forward
Current (Typical Values)
100.0
60
50
40
30
20
10
0
1
10
Number of Cycles at 60 Hz
0.1
I F- Peak Forward Current (A)
10.0
1.0
100
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
VF - Peak Forward Voltage
(V)
Soldering Parameters
Reflow Condition
- Temperature Min (T
s(min)
)
Pre Heat
- Temperature Max (T
s(max)
)
- Time (min to max) (t
s
)
Average ramp up rate (Liquidus Temp (T
A
)
to peak
T
S(max)
to T
A
- Ramp-up Rate
Reflow
- Temperature (T
A
) (Liquidus)
- Time (min to max) (t
s
)
Lead–free assembly
150°C
200°C
60 – 180 secs
3°C/second max
3°C/second max
217°C
60 – 150 seconds
260
+0/-5
°C
20 – 40 seconds
6°C/second max
8 minutes Max.
260°C
High Temp. Storage
JESD22-A103
JESD22-A108
JESD22-A104
JEDEC-J-STD-020, Level 1
JESD22-A101
JESD22-A111
Temperature (T)
T
P
Ramp-up
t
p
Critical Zone
T
L
to T
P
T
L
T
s(max)
t
L
T
s(min)
Ramp-down
Preheat
t
s
25˚C
t 25˚C to Peak
Time (t)
Peak Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
Environmental Specifications
Physical Specifications
Weight
Case
Polarity
Terminal
0.002 ounce, 0.061 gram
JEDEC DO-214AC Molded Plastic over
glass passivated junction
Color band denotes cathode except Bipolar
Matte Tin-plated leads, Solderable per
JESD22-B102
HTRB
Temperature Cycling
MSL
H3TRB
RSH
©2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/29/16
TVS Diodes
Surface Mount – 400W > SMAJ-E Series
SMAJ series
Dimensions
DO-214AC (SMA)
Cathode Band
(for Uni-directional products only)
Dimensions
A
Inches
Min
0.049
0.157
0.095
0.075
0.030
-
0.189
0.006
0.070
0.082
-
0.082
Max
0.065
0.181
0.110
0.090
0.060
0.008
0.208
0.012
-
-
0.090
-
Millimeters
Min
1.250
3.990
2.400
1.900
0.780
-
4.800
0.152
1.800
2.100
-
2.100
Max
1.650
4.600
2.790
2.290
1.520
0.203
5.280
0.305
-
-
2.300
-
A
B
H
D
F
G
J
K
L
C
B
C
D
E
F
G
H
I
J
K
L
E
I
Solder Pads
Part Numbering System
SMAJ xxx A-E
(all dimensions in mm)
Part Marking System
Cathode Band
F
YMXXX
EPI SILICON TECHNOLOGY
5%
V
BR
VOLTAGE TOLERANCE
(for Uni-directional products only)
Littelfuse Logo
XX
Marking Code
Trace Code Marking
Y:Year Code
M: Month Code
XXX: Lot Code
V
R
VOLTAGE
SERIES
Packaging
Part number
SMAJxxxA-E
Component
Package
DO-214AC
Quantity
5000
Packaging
Option
Tape & Reel - 12mm tape/13” reel
Packaging
Specification
EIA STD RS-481
Tape and Reel Specification
0.157
(4.0)
Cathode
0.47
(12.0)
0.157
(4.0)
13.0 (330)
0.80 (20.2)
Arbor Hole Dia.
0.059 DIA
(1.5)
Cover tape
Dimensions are in inches
(and millimeters).
0.49
(12.5)
Direction of Feed
©2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/29/16
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