Page 1
Transient Voltage Suppression Diodes
Axial Leaded – 3kA > AK3 series
AK3 Series
Agency Approvals
AGENCY AGENCY FILE NUMBER
E128662
Maximum Ratings and Thermal Characteristics
=25°C unless otherwise noted)
(T
A
Parameter Symbol Value Unit
Operating Storage Temperature
Range
Operating Junction Temperature
Range
Current Rating
Note:
1. Rated I
PP
1
measured with 8/20μs pulse.
T
STG
T
J
I
PP
(-)55 to 150 °C
(-)55 to 125 ºC
3 kA
RoHS
Description
The AK3 series of high current transient suppressors have
been specially designed for use in A.C. line protection and
any demanding applications (AC or DC). They offer superior
clamping characteristics over standard S.A.D. technologies
by virtue of the Littelfuse Foldbak technology. Therefore,
any voltage rise due to increased current conduction is
contained to a minimum, providing the best possible
protection level. They can also be connected in series and/
or parallel to create very high capacity protection solutions.
Features
• Very low clamping voltage
• Ultra compact: less
than one-tenth the size
of traditional discrete
solutions
• Sharp breakdown voltage
• Low slope resistance
• Bi-directional
• Foldbak technology for
superior clamping factor
• Symmetric in leads width
for easier soldering during
• IEC-61000-4-2 ESD
15kV(Air), 8kV (Contact)
• ESD protection of data
lines in accordance with
IEC 61000-4-2 (IEC801-2)
• EFT protection of data
lines in accordance with
IEC 61000-4-4 (IEC801-4)
• Halogen-free
• RoHS compliant
• Glass passivated junction
assembly
Additional Information
Functional Diagram
Datasheet
Bi-directional
Electrical Characteristics.(T
Part
Numbers
AK3 - 015C 3-015C 15 10 15 16 19 10 28 3,000 0.1 9.0 X
AK3 - 030C 3-030C 30 10 15 32 37 10 90 3,000 0.1 11. 0 X
AK3 - 058C 3-058C 58 10 15 64 70 10 110 3,000 0.1 6.0 X
AK3 - 066C 3-066C 66 10 15 72 80 10 120 3,000 0.1 6.0 X
AK3 - 076C 3-076C 76 10 15 85 95 10 140 3,000 0.1 6.0 X
AK3 - 150C 3-150C 150 10 15 15 8 194 10 230 3,000 0.1 2.6 X
AK3 - 170C 3-170C 170 10 15 179 220 10 260 3,000 0.1 2.4 X
AK3 - 380C 3-380C 380 10 15 4 01 443 10 520 3,000 0.1 2.0 X
AK3 - 430C 3-430C 430 10 15 440 490 10 625 3,000 0.1 2.0 X
Note: Using 8/20µS wave shape as defined in IEC 61000-4-5.
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/04/14
Marking
Part
Standoff
Voltage
(VSO)
Volts
=25°C unless otherwise noted)
A
Max.
Reverse
Leakage
(I
) @VSO
R
µA
Typical
IR @
85°C
(µA)
Voltage (VBR) @ I
Min Volts Max Volts (mA) VCL Volts IPP Amps (%/°C) (nF)
Reverse
Breakdown
Current
T
Test
Max. Clamping Voltage
VCL @ Ipp Peak Pulse
I
Current (IPP) (Note 1)
T
Resources
Max. Temp
Coefficient
OF V
BR
Samples
Max.
Capaci-
tance
0 Bias
10kHz
Agency
Approval
Page 2
Transient Voltage Suppression Diodes
0
50
100
150
200
250
300
0 0.5 1 1.5 2 2.5 3 3.5 4
TIME(MINUTES)
TEMPERATURE
(
º
C)
Maximum W ave 240C
0
50
100
150
200
250
300
0 0.5 1 1.5 2 2.5 3 3.5 4
TIME(MINUTES)
TEMPERATURE
(ºC)
Maximum W ave 260C
0
20
40
60
80
100
0255075 100 125
Percent of Rated Value
T - AMBI ENT TEMPERATURE (°C)
A
Current (kA)
Voltage (V)
Axial Leaded – 3kA > AK3 series
Physical Specifications
Weight Contact manufacturer
Flow/Wave Soldering (Solder Dipping)
Peak Temperature : 265°C
Dipping Time : 10 seconds
Case Epoxy encapsulated
Terminal
Silver plated leads, solderable per
MIL-STD-750, Method 2026
Soldering : 1 time
Wave Solder Profile
Figure 1 - Non Lead-free Profile Figure 2 - Surge Response
Ratings and Characteristic Curves (T
Figure 3 - Peak Power Derating Figure 4 - Surge Response
=25°C unless otherwise noted)
A
continues on next page.
Specifications are subject to change without notice.
© 2014 Littelfuse, Inc.
Revised: 03/04/14
Page 3
Transient Voltage Suppression Diodes
L2
L1
A
G
D
E
F
C
B
C
50
100
0
t
r
t
d
0
Peak
Value
Half Value
t – Time (µs)
I
PP
– Peak Pulse Current – %I
PP
tr = rise time to peak value
t
d
= decay time to half value
t
r
x t
d
=8/20µs
0.1
1
10
1000
0.00001 0.0001 0.001
P
PPM
-Peak Pulse Power (kW)
td-Pulse Width (sec.)
100
AK3-076C
8/20µs
10/350µs
10/1000µs
-8
-6
-4
-2
0
2
4
6
8
10
12
-50 -25025 50 75 100 125
Percent of V
BR
Change
Junction Temperature(Tj )
Axial Leaded – 3kA > AK3 series
Figure 5 - Typical Peak Pulse Power Rating Curve Figure 6 - Typical V
Figure 7 - Surge Response (8/20 Surge current waveform)
Voltage
Figure 8 - Pulse Waveform
Vs Junction Temperature
BR
Current
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.
Dimensions
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/04/14
Time (µs)
Dimensions Inches Millimeters
A 0.951 +/- 0.040 24.15 +/- 1.00
B 0.094 +/- 0.024 2.40 +/- 0.60
C 0.236 +/- 0.039 6.00 +/- 1.00
D 0.433 max. 11.0 max.
E 0.050 +/- 0.002 1.27 +/- 0.05
F 0.374 max. 9.50 max.
-015C 0.093 +/- 0.039 2.36 +/- 1.00
-030C/-066C 0.130 +/- 0.047 3.30 +/- 1.20
-058C/-076C 0.168 +/- 0.047 4.27 +/- 1.20
G
-150C 0.383 +/- 0.047 9.72 +/- 1.20
-170C 0.420 +/- 0.047 10.67 +/- 1.20
-380C 0.547 +/- 0.047 13.90 +/- 1.20
-430C 0.583 +/- 0.047 14.80 +/- 1.20
L1/L2
L1 = L2 tolerance +/- 0.047 inch (+/- 1.20 mm)
Page 4
Part Marking System
AK3 -
XXXX
Transient Voltage Suppression Diodes
Axial Leaded – 3kA > AK3 series
Part Marking
3-XXXX
L
F
YWW
Littelfuse Logo
Trace Code Marking
Y:Year Code
WW: Working Week Code
Type 1- Side View
Part Numbering System
Series Type
Apply to P/N listed below:
AK3-015C
AK3-030C
AK3-058C
AK3-066C
AK3-076C
Stand Off Voltage
(Please Refer to Electrical
Characteristics Chart)
Littelfuse Logo
L
F
3-xxxx
YWW
Trace Code Marking
Y:Year Code
WW: Working Week Code
Type 2 - Top View
Part Marking
Apply to P/N listed below:
AK3-150C
AK3-170C
AK3-208C
AK3-380C
AK3-430C
Packing Options
Part Number
AK3-XXXX AK Package 56 Bulk
Component
Package
Quantity
Packaging
Option
Specifications are subject to change without notice.
© 2014 Littelfuse, Inc.
Revised: 03/04/14
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