Transient Voltage Suppression Diodes
Axial Leaded – 1kA > AK1 series
AK1 Series
RoHS
Description
The AK1 series of high current transient suppressors have
been specially designed for use in D.C. line protection and
any demanding applications (DC). 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
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E128662
Maximum Ratings and Thermal Characteristics
(TA=25°C unless otherwise noted)
Parameter
Symbol
Value
Unit
Operating Storage Temperature
Range
TSTG
(-)55 to 125
°C
Operating Junction Temperature
Range
TJ
(-)55 to 125
ºC
Current Rating1
IPP
1
kA
• 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
Additional Information
Datasheet
Samples
Resources
Note:
1. Rated IPP measured with 8/20μs pulse.
Functional Diagram
Anode
Cathode
Electrical Characteristics.(TA=25°C unless otherwise noted)
Part
Numbers
Standoff
Voltage
(VSO) Volts
Max.
Reverse
Leakage
(IR) @VSO
µA
AK1 - 076C
76
20
Reverse Breakdown
Voltage (VBR) @ IT
Test
Current
IT
Min Volts Max Volts
(mA)
VCL Volts
IPP Amps
(%/°C)
(nF)
10
140
1,000
0.1
8.5
85
Note: Using 8/20µS wave shape as defined in IEC 61000-4-5.
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/13/13
95
Max. Clamping Voltage Max. Temp
Max.
Agency
VCL @ Ipp Peak Pulse
Coefficient Capacitance Approval
Current (IPP) (Note 1)
OF VBR
0 Bias 10kHz
X
Transient Voltage Suppression Diodes
Axial Leaded – 1kA > AK1 series
Soldering Parameters
Lead–free assembly
Pre Heat
- Temperature Min (Ts(min))
150°C
- Temperature Max (Ts(max))
200°C
- Time (min to max) (ts)
60 – 180 secs
Ramp-up
TL
Average ramp up rate (Liquidus Temp
(TL) to peak
3°C/second max
TS(max) to TL - Ramp-up Rate
3°C/second max
Reflow
tp
TP
Temperature (T)
Reflow Condition
217°C
- Time (min to max) (ts)
60 – 150 seconds
Peak Temperature (TP)
260+0/-5 °C
Time within 5°C of actual peak
Temperature (tp)
20 – 40 seconds
Ramp-down Rate
6°C/second max
Time 25°C to peak Temperature (TP)
8 minutes Max.
Do not exceed
280°C
Critical Zone
TL to TP
Ts(max)
Ts(min)
Ramp-down
ts
Preheat
25˚C
- Temperature (TL) (Liquidus)
tL
t 25˚C to Peak
Time (t)
Flow/Wave Soldering (Solder Dipping)
Peak Temperature :
265°C
Dipping Time :
10 seconds
Soldering :
1 time
Physical Specifications
Weight
Contact manufacturer
Case
Epoxy encapsulated
Terminal
Silver plated leads, solderable per
MIL-STD-750, Method 2026
Ratings and Characteristic Curves (TA=25°C unless otherwise noted)
Figure 1 - Peak Power Derating
Figure 2 - Surge Response
100
80
Current (kA)
Percent of Rated Value
120
60
40
20
0
0
25
50
75
100
AMBIENT TEMPERATURE (°C)
125
Voltage (V)
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/13/13
Transient Voltage Suppression Diodes
Axial Leaded – 1kA > AK1 series
Figure 3 - Surge Response (8/20 Surge current waveform)
Voltage
Notes:
1. Foldback characteristic reduce the clamping voltage
to near the breakdown voltage
2. 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
Current
Time (µs)
Dimensions
A
G
L2
Dimensions
F
L1
D
C
B
E
C
Part Marking System
A
B
C
D
E
F
G
L1
L2
Inches
Millimeters
0.950 +/- 0.040
24.15 +/- 1.00
0.095 +/- 0.024
2.4 +/- 0.60
0.145 +/- 0.040
3.68 +/- 1.00
0.570 max.
14.48 max.
0.050 +/- 0.002
1.270 +/- 0.05
0.500 max.
12.70 max.
0.096 +/- 0.040
2.44 +/- 1.00
0.427 +/- 0.040
10.85 +/- 1.00
= A - (G+L1) tolerance +/- 0.04 inch (1.0 mm)
Part Numbering System
Product Type
AK1 - XXXX
Stand Off Voltage
Series Type
AK1-XXXX
LF
(Please Refer to Electrical
Characteristics Chart)
YWW
Littelfuse Logo
Packing Options
Trace Code Marking
Y:Year Code
WW: Working Week Code
Side View
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/13/13
Part Number
AK1-XXXX
Component
Package
Quantity
Packaging
Option
AK Package
56
Bulk