1Publication Order Number:
P6KE6.8A/D
P6KE6.8A Series
600 Watt Peak Power
Littelfuse -40 Transient
Voltage Suppressors
Unidirectional*
The P6KE6.8A series is designed to protect voltage sensitive
components from high voltage, high energy transients. They have
excellent clamping capability, high surge capability and fast response
time. These devices are the Littelfuse exclusive, cost-
effective, highly reliable axial leaded package and is ideally-suited
for use in communication systems, numerical controls, process
controls, medical equipment, business machines, power supplies
and many other industrial/consumer applications.
Features:
Working Peak Reverse Voltage Range 5.8 to 171 V
Peak Power 600 W @ 1 ms
ESD Rating of Class 3 (>16 KV) per Human Body Model
Maximum Clamp Voltage @ Peak Pulse Current
Low Leakage < 5 mA above 10 V
Maximum Temperature Coefficient Specified
UL 497B for Isolated Loop Circuit Protection
Response Time is Typically < 1 ns
PbFree Packages are Available*
Mechanical Characteristics:
CASE: Void-free, Transfer-molded, Thermosetting plastic
FINISH: All external surfaces are corrosion resistant and leads are
readily solderable
MAXIMUM LEAD TEMPERATURE FOR SOLDERING:
260C, 1/16 from the case for 10 seconds
POLARITY: Cathode indicated by polarity band
MOUNTING POSITION: Any
MAXIMUM RATINGS
Rating Symbol Value Unit
Peak Power Dissipation (Note 1) @ TL 25°C PPK 600 W
Steady State Power Dissipation
@ TL 25°C, Lead Length = 3/8 in
Derated above TL = 50°C
PD5.0
50
W
mW/°C
Thermal Resistance, JunctiontoLead RqJL 20 °C/W
Forward Surge Current (Note 2) @ TA = 25°C IFSM 100 A
Operating and Storage Temperature Range TJ, Tstg 55 to
+150
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum
Ratings are stress ratings only. Functional operation above the Recommended
Operating Conditions is not implied. Extended exposure to stresses above the
Recommended Operating Conditions may affect device reliability.
1. Nonrepetitive current pulse per Figure 4 and derated above TA = 25°C per
Figure 2.
2. 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, duty cycle = 4 pulses
per minute maximum.
Cathode Anode
MARKING DIAGRAM
A
P6KE
xxxA
YYWW
Device Package Shipping
ORDERING INFORMATION
P6KExxxA Axial Lead 1000 Units / Box
P6KExxxAG Axial Lead
(Pb−Free)
1000 Units / Box
P6KExxxARL Axial Lead 4000/Tape & Reel
P6KExxxARLG Axial Lead
(Pb−Free)
4000/Tape & Reel
AXIAL LEAD
CASE 017AA
PLASTIC
A = Assembly Location
P6KExxxA = Device Number
YY = Year
WW = Work Week
= PbFree Package
(Note: Microdot may be in either location)
Littelfuse.com
Specifications subject to change without notice. © 2016 Littelfuse, Inc.
September 19, 2016 − Rev. 10
UniDirectional TVS
IPP
IF
V
I
IR
IT
VRWM
VCVBR
VF
P6KE6.8A Series
ELECTRICAL CHARACTERISTICS (TA = 25°C unless
otherwise noted, VF = 3.5 V Max. @ IF (Note 6) = 50 A)
Symbol Parameter
IPP Maximum Reverse Peak Pulse Current
VCClamping Voltage @ IPP
VRWM Working Peak Reverse Voltage
IRMaximum Reverse Leakage Current @ VRWM
VBR Breakdown Voltage @ IT
ITTest Current
QVBR Maximum Temperature Coefficient of VBR
IFForward Current
VFForward Voltage @ IF
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted, VF = 3.5 V Max. @ IF (Note 6) = 50 A)
Device*
Device
Marking
VRWM
(Note 3) IR @ VRWM
Breakdown Voltage VC @ IPP (Note 5)
QVBR
VBR (Note 4) (V) @ ITVCIPP
VmAMin Nom Max mA V A %/°C
P6KE6.8A, G P6KE6.8A 5.8 1000 6.45 6.80 7.14 10 10.5 57 0.057
P6KE7.5ARLG P6KE7.5A 6.4 500 7.13 7.51 7.88 10 11.3 53 0.061
P6KE10AG P6KE10A 8.55 10 9.5 10 10.5 1 14.5 41 0.073
P6KE12A, G P6KE12A 10.2 5 11.4 12 12.6 1 16.7 36 0.078
P6KE13AG P6KE13A 11.1 5 12.4 13.05 13.7 1 18.2 33 0.081
P6KE15AG P6KE15A 12.8 5 14.3 15.05 15.8 1 21.2 28 0.084
P6KE16A, G P6KE16A 13.6 5 15.2 16 16.8 1 22.5 27 0.086
P6KE18AG P6KE18A 15.3 5 17.1 18 18.9 1 25.2 24 0.088
P6KE20ARLG P6KE20A 17.1 5 19 20 21 1 27.7 22 0.09
P6KE22ARLG P6KE22A 18.8 5 20.9 22 23.1 1 30.6 20 0.092
P6KE24ARLG P6KE24A 20.5 5 22.8 24 25.2 1 33.2 18 0.094
P6KE27ARLG P6KE27A 23.1 5 25.7 27.05 28.4 1 37.5 16 0.096
P6KE30ARLG P6KE30A 25.6 5 28.5 30 31.5 1 41.4 14.4 0.097
P6KE33AG P6KE33A 28.2 5 31.4 33.05 34.7 1 45.7 13.2 0.098
P6KE36AG P6KE36A 30.8 5 34.2 36 37.8 1 49.9 12 0.099
P6KE39AG P6KE39A 33.3 5 37.1 39.05 41 1 53.9 11.2 0.1
P6KE43AG P6KE43A 36.8 5 40.9 43.05 45.2 1 59.3 10.1 0.101
P6KE47AG P6KE47A 40.2 5 44.7 47.05 49.4 1 64.8 9.3 0.101
P6KE51AG P6KE51A 43.6 5 48.5 51.05 53.6 1 70.1 8.6 0.102
P6KE56AG P6KE56A 47.8 5 53.2 56 58.8 1 77 7.8 0.103
P6KE62ARLG P6KE62A 53 5 58.9 62 65.1 1 85 7.1 0.104
P6KE68AG P6KE68A 58.1 5 64.6 68 71.4 1 92 6.5 0.104
P6KE75ARLG P6KE75A 64.1 5 71.3 75.05 78.8 1 103 5.8 0.105
P6KE82ARLG P6KE82A 70.1 5 77.9 82 86.1 1 113 5.3 0.105
P6KE91ARLG P6KE91A 77.8 5 86.5 91 95.5 1 125 4.8 0.106
P6KE100ARLG P6KE100A 85.5 5 95 100 105 1 137 4.4 0.106
P6KE120ARLG P6KE120A 102 5 114 120 126 1 165 3.6 0.107
P6KE130AG P6KE130A 111 5 124 130.5 137 1 179 3.3 0.107
P6KE150AG P6KE150A 128 5 143 150.5 158 1 207 2.9 0.108
P6KE160ARLG P6KE160A 136 5 152 160 168 1 219 2.7 0.108
P6KE180ARLG P6KE180A 154 5 171 180 189 1 246 2.4 0.108
P6KE200A, G P6KE200A 171 5 190 200 210 1 274 2.2 0.108
3. A transient suppressor is normally selected according to the maximum working peak reverse voltage (VRWM), which should be equal to or
greater than the dc or continuous peak operating voltage level.
4. VBR measured at pulse test current IT at an ambient temperature of 25°C
5. Surge current waveform per Figure 4 and derate per Figures 1 and 2.
6. 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, duty cycle = 4 pulses per minute maximum.
*The “G’’ suffix indicates Pb−Free package or Pb−Free Packages are available.
2Publication Order Number:
P6KE6.8A/D
Specifications subject to change without notice. © 2016 Littelfuse, Inc.
September 19, 2016 − Rev. 10
P6KE6.8A Series
100
10
1
0.1
0.1 ms1ms10ms 100 ms1ms 10ms
PP, PEAK POWER (kW)
tP
, PULSE WIDTH
NONREPETITIVE PULSE
WAVEFORM SHOWN IN
FIGURE 4
Figure 1. Pulse Rating Curve
100
80
60
40
20
0
0 25 50 75 100 125 150 175 200
PEAK PULSE DERATING IN % OF
PEAK POWER OR CURRENT @ T
A= 25 C
TA, AMBIENT TEMPERATURE (C)
Figure 2. Pulse Derating Curve
K
DERATING FACTOR
1 ms
10 ms
1
0.7
0.5
0.3
0.05
0.1
0.2
0.01
0.02
0.03
0.07
100 ms
0.1 0.2 0.5 2 5 10 501 20 100
D, DUTY CYCLE (%)
PULSE WIDTH
10 ms
10,000
1000
100
10
0.1 1 10 100 1000
C, CAPACITANCE (pF)
VBR, BREAKDOWN VOLTAGE (VOLTS)
Figure 3. Capacitance versus Breakdown Voltage
MEASURED @
VRWM
MEASURED @
ZERO BIAS
100
50
001 2 3 4
t, TIME (ms)
VALUE (%)
tr 10 ms
tP
PEAK VALUE IPP
HALF VALUE IPP
2
Figure 4. Pulse Waveform
PULSE WIDTH (tp) IS
DEFINED AS THAT
POINT WHERE THE
PEAK CURRENT
DECAYS TO 50% OF IPP
.
5
4
3
2
1
25 50 75 100 125 150 175 200
P
D, STEADY STATE POWER DISSIPATION (WATTS)
TL, LEAD TEMPERATURE C)
3/8
3/8
Figure 5. Steady State Power Derating
0
0
Figure 6. Typical Derating Factor for Duty Cycle
3Publication Order Number:
P6KE6.8A/D
Specifications subject to change without notice. © 2016 Littelfuse, Inc.
September 19, 2016 − Rev. 10
P6KE6.8A Series
APPLICATION NOTES
RESPONSE TIME
In most applications, the transient suppressor device is
placed in parallel with the equipment or component to be
protected. In this situation, there is a time delay associated with
the capacitance of the device and an overshoot condition
associated with the inductance of the device and the inductance
of the connection method. The capacitance effect is of minor
importance in the parallel protection scheme because it only
produces a time delay in the transition from the operating
voltage to the clamp voltage as shown in Figure 7.
The inductive effects in the device are due to actual turn-on
time (time required for the device to go from zero current to full
current) and lead inductance. This inductive effect produces an
overshoot in the voltage across the equipment or component
being protected as shown in Figure 8. Minimizing this
overshoot is very important in the application, since the main
purpose for adding a transient suppressor is to clamp voltage
spikes. The P6KE6.8A series has very good response time,
typically < 1 ns and negligible inductance. However, external
inductive effects could produce unacceptable overshoot.
Proper circuit layout, minimum lead lengths and placing the
suppressor device as close as possible to the equipment or
components to be protected will minimize this overshoot.
Some input impedance represented by Zin is essential to
prevent overstress of the protection device. This impedance
should be as high as possible, without restricting the circuit
operation.
DUTY CYCLE DERATING
The data of Figure 1 applies for non-repetitive conditions
and at a lead temperature of 25°C. If the duty cycle increases,
the peak power must be reduced as indicated by the curves of
Figure 6. Average power must be derated as the lead or ambient
temperature rises above 25°C. The average power derating
curve normally given on data sheets may be normalized and
used for this purpose.
At first glance the derating curves of Figure 6 appear to be
in error as the 10 ms pulse has a higher derating factor than the
10 ms pulse. However, when the derating factor for a given
pulse of Figure 6 is multiplied by the peak power value of
Figure 1 for the same pulse, the results follow the expected
trend.
TYPICAL PROTECTION CIRCUIT
Vin
VL
V
Vin
Vin (TRANSIENT)
VL
td
V
VL
Vin (TRANSIENT)
Zin
LOAD
OVERSHOOT DUE TO
INDUCTIVE EFFECTS
tD = TIME DELAY DUE TO CAPACITIVE EFFECT
t t
Figure 7. Figure 8.
UL RECOGNITION*
The entire series including the bidirectional CA suffix has
Underwriters Laboratory Recognition for the classification of
protectors (QVGQ2) under the UL standard for safety 497B
and File #E210057. Many competitors only have one or two
devices recognized or have recognition in a non-protective
category. Some competitors have no recognition at all. With
the UL497B recognition, our parts successfully passed several
tests including Strike Voltage Breakdown test, Endurance
Conditioning, Temperature test, Dielectric Voltage-Withstand
test, Discharge test and several more.
Whereas, some competitors have only passed a flammability
test for the package material, we have been recognized for
much more to be included in their protector category.
*Applies to P6KE6.8A P6KE200A.
4Publication Order Number:
P6KE6.8A/D
Specifications subject to change without notice. © 2016 Littelfuse, Inc.
September 19, 2016 − Rev. 10
P6KE6.8A Series
PACKAGE DIMENSIONS
LITTELFUSE 40, AXIAL
LEAD
CASE 017AA−01
ISSUE O
B
D
F
K
A
F
K
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.330 0.350 8.38 8.89
B0.130 0.145 3.30 3.68
D0.037 0.043 0.94 1.09
F--- 0.050 --- 1.27
K1.000 1.250 25.40 31.75
NOTES:
1. CONTROLLING DIMENSION: INCH
2. LEAD DIAMETER AND FINISH NOT CONTROLLED
WITHIN DIMENSION F.
3. CATHODE BAND INDICATES POLARITY
5Publication Order Number:
P6KE6.8A/D
Specifications subject to change without notice. © 2016 Littelfuse, Inc.
September 19, 2016 − Rev. 10
Littelfuse.com
Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military,
aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or
any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property
damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be
deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be
liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in
applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale,
unless otherwise agreed by Littelfuse.