TVS Diodes
Axial Leaded – 3kA > AK3-Y series
RoHS
AK3-Y Series
Description
Pb
e4
Agency Recognitions
AGENCY
AGENCY FILE NUMBER
E128662
The AK3-Y series of high power TVS diode is specially
designed for meeting severe surge test environment of
both AC and DC line protection applications. It features a
very fast response and ultra low clamping characteristics
as compared to MOVs (Metal Oxide Varistors). It
accomplishes this by virtue of the Littelfuse Foldback
TM
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 maintained at a minimum magnitude,
providing the best possible protection level. These AK
components can be connected in series and / or parallel to
create a very high surge current protection solution.
Features
• Recognized to UL 497B as
an Isolated Loop Circuit
Protector
• Both reflow and wave
soldering capable
• Very low clamping voltage
• Ultra compact: less
than one-tenth the size
of traditional discrete
solutions
• Sharp breakdown voltage
• Low slope resistance
• Bi-directional
• Foldback technology for
superior clamping factor
• Symmetric in leads width
for easier soldering during
assembly.
• IEC-61000-4-2 ESD
15kV(Air), 8kV (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
• Halogen-free and RoHS
compliant
• Glass passivated junction
• Pb-free E4 means 2
nd
level
interconnect is Pb-free
and the terminal finish
material is silver
Maximum Ratings and Thermal Characteristics
(T
A
=25
O
C unless otherwise noted)
Parameter
Operating Storage Temperature
Range
Operating Junction Temperature
Range
Current Rating
1
Note:
1. Rated I
PP
measured with 8/20μs pulse.
Symbol
T
STG
T
J
I
PP
Value
-55 to
150
-55 to 125
3
Unit
°C
ºC
kA
Functional Diagram
Bi-direcctional
Electrical Characteristics
(T =25°C unless otherwise noted)
A
Part
Numbers
Max.
Standoff
Reverse
Part
Voltage
Leakage
Marking
(V
SO
)
(I
R
) @V
SO
Volts
µA
3-015C
3-030C
3-038C
3-058C
3-066C
3-076C
3-150C
3-170C
3-190C
3-208C
3-380C
3-430C
15
30
38
58
66
76
150
170
190
208
380
430
10
10
10
10
10
10
10
10
10
10
10
10
Max. Clamping
Max.
Max.
Typical Reverse Breakdown Test
Agency
Voltage
Temp
Current
Capacitance Approval
I
R
@
Voltage (V
BR
) @ I
T
V
CL
@ I
pp
Peak Pulse Coefficient
I
T
0 Bias 10kHz
85
O
C
Current (I
PP
) (Note 1)
OF V
BR
(µA)
Min Volts Max Volts (mA)
V
CL
Volts I
PP
Amps
(%/
O
C)
(nF)
15
15
15
15
15
15
15
15
15
15
15
15
16
32
40
64
72
85
158
179
200
223
401
440
19
37
46
70
80
95
194
220
245
246
443
490
10
10
10
10
10
10
10
10
10
10
10
10
28
90
95
110
120
140
230
260
290
306
520
625
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
9.0
11.0
10.0
6.0
6.0
6.0
2.6
2.4
2.4
2.4
2.0
2.0
X
X
X
X
X
X
X
X
X
X
X
AK3-015C-Y
AK3-030C-Y
AK3-038C-Y
AK3-058C-Y
AK3-066C-Y
AK3-076C-Y
AK3-150C-Y
AK3-170C-Y
AK3-190C-Y
AK3-208C-Y
AK3-380C-Y
AK3-430C-Y
Note:
1. Using 8/20μs wave shape as defined in IEC 61000-4-5.
©2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 07/19/19
TVS Diodes
Axial Leaded – 3kA > AK3-Y series
Ratings and Characteristic Curves
(T =25°C unless otherwise noted)
(Continued)
A
Figure 1 - Peak Power Derating
Figure 2 - Pulse Waveform
Percent of Rated Value
100
I
PP
– Peak Pulse Current – %I
PP
80
60
40
20
0
0
25
50
75
100
125
100
Peak
Value
t
r
= rise time to peak value
t
d
= decay time to half value
t
r
x t
d
=8/20µs
50
Half Value
0
0
T
J
- Initial Junction Temperature (ºC)
t
r
t
d
t – Time (µs)
Figure 3 - Typical Peak Pulse Power Rating Curve
1000
8/20µs
Figure 4 - Typical V
BR
Vs Junction Temperature
12
10
P
PPM
-Peak Pulse Power (kW)
100
AK3-076C-Y
10/350µs
10/1000µs
Percent of V
BR
Change
8
6
4
2
0
-2
-4
-6
-8
10
1
0.1
0.00001
0.0001
t
d
-Pulse Width (sec.)
0.001
-50
-25
0
25
50
75
100 125
Junction Temperature(T
j
)
Figure 5 -Surge Response (8/20 Surge current waveform)
Voltage
Current
Time (µs)
Note: The power dissipation causes a change in avalanche voltage during the surge and the
avalanche voltage eventually returns to the original value when the transient has passed.
©2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 07/19/19
TVS Diodes
Axial Leaded – 3kA > AK3-Y 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
L
) (Liquidus)
- Time (min to max) (t
L
)
Lead–free assembly
150°C
200°C
Temperature (T)
T
P
Ramp-up
t
p
Critical Zone
T
L
to T
P
60 – 120 secs
3°C/second max
3°C/second max
217°C
60 – 150 seconds
260
+0/-5
T
L
T
s(max)
t
L
T
s(min)
Ramp-down
Preheat
t
s
25˚C
t 25˚C to Peak
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
°C
Time (t)
30 seconds
6°C/second max
8 minutes Max.
260°C
Flow Soldering (Solder Dipping)
Reflow Condition
- Temperature Min (T
s(min)
)
Pre Heat
- Temperature Max (T
s(max)
)
- Time to Pre-Heat Temp
Average ramp up rate to Pre-Heat Temp
Peak Temperature (T
P
)
Average ramp up rate (pre-heat to T
P
)
Time within actual peak Temperature Max
Ramp-down Rate
Lead–free assembly
140°C
160°C
5°C/second max
260
+0/-5
°C
5°C/second max
6 seconds
5°C/second max
time to peak temperature
T
p
t
p
Temperature
60 – 150 secs
T
S
Pre-heat
time (t)
Physical Specifications
Weight
Case
Terminal
Contact manufacturer
UL Recognized compound meeting
flammability rating V-0
Silver plated leads, solderable per
MIL-STD-750 Method 2026
©2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 07/19/19
TVS Diodes
Axial Leaded – 3kA > AK3-Y series
Dimensions
Dimensions
Inches
0.951 +/- 0.040
0.094 +/- 0.024
0.236 +/- 0.039
0.433 max.
0.050 +/- 0.002
0.374 max.
0.093 +/- 0.039
0.130 +/- 0.047
Millimeters
24.15 +/- 1.00
2.40 +/- 0.60
6.00 +/- 1.00
11.0 max.
1.27 +/- 0.05
9.50 max.
2.36 +/- 1.00
3.30 +/- 1.20
A
L2
G
L1
F
D
C
B
C
E
A
B
C
D
E
F
-015C-Y
-030C-Y/-038C-Y
-066C-Y
G
-058C-Y/-076C-Y
-150C-Y
-170C-Y
-380C-Y
-430C-Y
L1/L2
0.168 +/- 0.047
4.27 +/- 1.20
0.383 +/- 0.047
9.72 +/- 1.20
0.420 +/- 0.047
10.67 +/- 1.20
0.547 +/- 0.047
13.90 +/- 1.20
0.583 +/- 0.047
14.80 +/- 1.20
L1= L2 tolerance +/- 0.047 inch (+/- 1.20 mm)
Part Marking System
Part Marking
Apply to P/N listed below:
AK3-015C-Y
AK3-030C-Y
AK3-038C-Y
AK3-058C-Y
AK3-066C-Y
AK3-076C-Y
Littelfuse Logo
Apply to P/N listed below:
AK3-150C-Y
AK3-170C-Y
AK3-208C-Y
AK3-380C-Y
AK3-430C-Y
3-XXXX
F
L
YWW
3-xxxx
Type 1- Side View
Part Numbering System
Series Type
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and
test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications.
Read complete Disclaimer Notice at
http://www.littelfuse.com/disclaimer-electronics.
©2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 07/19/19
F
L
Littelfuse Logo
YWW
Trace Code Marking
Y:Year Code
WW: Working Week Code
Trace Code Marking
Part Marking
Y:Year Code
WW: Working Week Code
Type 2 - Top View
Packing Options
Part Number
Component
Package
AK Package
AK Package
Quantity
56pcs/Box
12pcs/Box
Packaging
Option
Bulk
Bulk
AK3 - XXXX -Y
Yellow Coating
Stand Off Voltage
(Please Refer to Electrical
Characteristics Chart)
AK3-XXXX-Y
AK3-XXXX-Y-12
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