Transient Voltage Suppression Diodes
SMTO-218 - 6 kA > LTKAK6 series
LTKAK6 Series
Description
RoHS
Pb
e3
The LTKAK6 series offers superior clamping characteristics
over standard S.A.D. technologies by virtue of the
Littelfuse Foldbak technology, which provides a clamping
voltage lower than the avalanche voltage (but above the
rated working voltage). Therefore, any voltage rise due to
increased current conduction is contained to a minimum,
providing the best possible protection level.This LTKAK6
series can be combined in series or parallel solutions to
offer various clamping levels and surge withstand options.
The LTKAK6 SMT package provides a more compact PCB
layout than typical through-hole AK TVS components.
Agency Approvals
Features
AGENCY
AGENCY FILE NUMBER
E129662
Maximum Ratings and Thermal Characteristics
(T
A
=25
O
C unless otherwise noted)
Parameter
Operating Junction
Storage Temperature Range
Current Rating
1
Typical Thermal Resistance
Junction to Lead
Typical Thermal Resistance
Junction to Ambient
Note:
1. Rated min I
PP
measured with 8/20μs pulse.
Symbol
T
J
T
STG
I
PP
R
ƟJL
R
ƟJL
Value
-55 to 125
-55 to 150
6
10
50
Unit
°C
kA
°C/W
°C/W
• High Power TVS designed
in a surface mount and
compact SMTO-218
package
• Patent pending package
design
• Foldbak Technology
for superior clamping
characteristics
• Tube or tape and reel pack
options available
• Ideal for automatic pick
and place assembly
and reflow process to
reduce the manufacturing
cost and increase the
soldering quality as
compared to axial leaded
packages
• Low clamping and slope
resistance.
• Sharp breakdown voltage.
• Meet MSL level1, per
J-STD-020, LF maximum
peak of 260°C
• Pb-free E3 means 2nd
level interconnect is
Pb-free and the terminal
finish material is tin(Sn)
(IPC/JEDEC J-STD-609A.01)
• UL Recognized
compound meeting
flammability rating V-0
Electrical Characteristics
(T
A
=25°C unless otherwise noted)
Max. Reverse
Leakage
(I
R
) @V
SO
(µA)
10
10
10
Part
Numbers
Standoff
Voltage (V
SO
)
(V)
58
66
76
Reverse Breakdown Voltage
(V
BR
) @ I
T
Min Volts
64
72
85
Test
Current
I
T
(mA)
10
10
10
Max.
Clamping
Voltage
V
C
@ (I
PP
)
Volts
110
120
140
Max. Temp
Coefficient
of V
BR
(%/
O
C)
0.1
0.1
0.1
Max.
Capacitance
0V Bias 10kHz
(nF)
6.5
5.5
4.5
Max Volts
70
80
95
LTKAK6-058C
LTKAK6-066C
LTKAK6-076C
Note:
Using 8/20 waveshape as defined in IEC 61000-4-5 2
nd
edition.
Surge Ratings
Max Peak Pulse Current (I
PP
)
Part
Numbers
LTKAK6-058C
LTKAK6-066C
LTKAK6-076C
(80/20µS)
(A)
Min
6,000
6,000
6,000
(10/350µS)
(A)
Min
900
900
900
(10/1000µS)
(A)
Min
430
430
430
Typ
1,100
1,100
1,100
© 2018 Littelfuse, Inc. Revised: 07/26/18
Specifications are subject to change without notice.
littelfuse.com
Transient Voltage Suppression Diodes
SMTO-218 - 6 kA > LTKAK6 series
I-V Curve Characteristics
I
I
PP
P
PPM
Peak Pulse Power Dissipation
--
Max power dissipation
V
R
Stand-off Voltage
--
Maximum voltage that can be applied to the TVS without
operation
Bi-directional
I
T
I
R
V
R
V
BR
Vc
V
BR
Breakdown Voltage
--
V
Maximum voltage that flows though the TVS at a specified test
current (I
T
)
V
C
Clamping Voltage
--
Peak voltage measured across the TVS at a specified Ippm (peak
impulse current)
I
R
Reverse Leakage Current
--
Current measured at V
R
Ratings and Characteristic Curves
(T =25°C unless otherwise noted)
A
Typical Peak Pulse Power Rating Curve
900
8/20µs
Peak Power Derating
PPPM
-Peak Pulse Power (kW)
700
600
500
400
300
200
100
0
0.00001
10/350µs
LTKAK6-058C
LTKAK6-076C
LTKAK6-066C
Percent of Rated Value
800
100
80
60
40
20
0
0.0001
0.001
td-Pulse Width (sec.)
0.01
0
25
50
75
100
125
T
J
- Initial Junction Temperature (ºC)
Please contact Littelfuse for reliability or FIT/MTBF data , the performance is subject to
vary and depends on the end customers’ application condition.
Pulse Waveform
t
r
= rise time to peak value
t
d
= decay time to half value
I
PP
– Peak Pulse Current – %I
PP
100
Peak
Value
t
r
x t
d
=8/20µs
50
Half Value
0
0
t
r
t
d
t – Time (µs)
© 2018 Littelfuse, Inc. Revised: 07/26/18
Specifications are subject to change without notice.
littelfuse.com
AK10 Series
Transient Voltage Suppression Diodes
SMTO-218 - 6 kA > LTKAK6 series
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
Temperature (T)
t
p
Ramp-up
Critical Zone
T
L
to T
P
T
P
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
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
Flow/Wave Soldering (Solder Dipping)
Peak Temperature :
Dipping Time :
Soldering :
265
O
C
10 seconds
1 time
Physical Specifications
Weight
Case
Terminal
Contact manufacturer
Epoxy encapsulated
Tin plated lead, solderable per
MIL-STD-202 Method 208
Part Numbering System
LTK AK6 XXXX
X
Series Type
OPTION CODE:
BLANK
Reel Tape
-TP
Tube Pack
Stand Off Voltage
(Please Refer to Electrical
Characteristics Chart)
Physical Specifications
High Temp Storage
HTRB
MSL
H3TRB
RSH
JESD22-A103
JESD22-A108
JESDEC-J-STD020, Level 1
JESD22-A101
JESD22-B106
Part Marking System
Marking Code
LTKAK6
-076C
F
L
Littelfuse Logo
YMXXX
YMTXX
Trace Code Marking
Y: Year Code
M: Month Code
T: Manufacture Code
XXX
Sequential Lot Number
XX:
© 2018 Littelfuse, Inc. Revised: 07/26/18
Specifications are subject to change without notice.
littelfuse.com
Transient Voltage Suppression Diodes
SMTO-218 - 6 kA > LTKAK6 series
Dimensions — SMTO-218
Note:
Coplanarity of solder side is controlled within 0.08mm.
Dimension
A
B
C
D
E
F
G
H
J
L
M
N
Inches
Min
0.621
0.529
0.544
0.273
0.702
0.567
0.087
0.193
0.028
0.400
0.073
0.510
Max
0.655
0.594
0.561
0.285
0.737
0.587
0.126
0.222
0.033
0.440
0.112
0.533
Millimeters
Min
15.78
13.43
13.83
6.94
17
.82
14.40
2.20
4.89
0.72
10.17
1.85
12.95
Max
16.63
15.09
14.24
7
.24
18.72
14.90
3.20
5.65
0.85
11.17
2.85
13.55
Packaging
LTKAK6-xxxC
LTKAK6-xxxC-TP
4.34g
4.34g
Tape & Reel – 32mm/13” tape
Tube Pack
400
100(25/Tube)
Tape and Reel Specification
1.75
1.5
2.0
4.0
20.0
0.4
32.0
14.2
18.5
Dimensions in millimeters
14.5
7.6
Direction of Feed
© 2018 Littelfuse, Inc. Revised: 07/26/18
Specifications are subject to change without notice.
littelfuse.com
AK10 Series
Part Number
Weight
Packing Mode
Base Quantity
stm32/stm8
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