© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
TVS Diodes
Axial > 1500W > 1N5908
• Working Peak Reverse Voltage Range - 5.0 V
• Peak Power - 1500 Watts @ 1 ms
• Maximum Clamp Voltage @ Peak Pulse Current
• Low Leakage < 5 µA Above 10 V
• Response Time is Typically < 1 ns
• These are Pb-Free Devices*
Features
These devices are designed to protect voltage sensitive
components from high voltage, high-energy transients.
They have excellent clamping capability, high surge
capability, low zener impedance and fast response time.
These devices are the Littelfuse exclusive, cost effective,
highly reliable axial leaded package and are ideally suited
for use in communication systems, numerical controls,
process controls, medical equipment, business machines,
power supplies and many other industrial/consumer
applications, to protect CMOS, MOS and Bipolar
integrated circuits.
Description
Rating Symbol Value Unit
Peak Power Dissipation (Note 1) @
TL ” 25°C PPK 1500 W
Steady State Power Dissipation
@ TL “75°C, Lead Length = 3/8 ≤
Derated above TL = 75°C
PPK
5.0
50
W
mW/°C
Thermal Resistance,
Junction-to-Lead R8JL 20 °C/W
Forward Surge Current (Note 2)
@TA = 25°C IFSM 200 A
Operating and Storage
Temperature Range TJ, Tstg
−65 to
+175 °C/W
Maximum Ratings and Thermal Characteristics
1N5908
Functional Diagram
Bi-directional
Uni-directional
Cathode Anode
Pb
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.
*Bidirectional device will not be available in this device
Additional Information
Samples
Resources
Datasheet
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
TVS Diodes
Axial > 1500W > 1N5908
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
IFForward Current
VFForward Voltage @ IF
I-V Curve Characteristics (TA = 25°C unless otherwise noted, VF = 3.5 V Max. @ IF (Note 3) = 100 A)
Figure 1. Pulse Rating Curve
Ratings and Characteristic Curves
Figure 2. Pulse Derating Curve
Figure 3. Steady State Power Derating Figure 4. Pulse Waveform
5
4
3
2
1
25 50 75 1001 25 1501 75 200
PD, STEADY STATE POWER DISSIPATION (WATTS)
TL, LEAD TEMPERATURE (°C)
3/8
3/8
0
0
100
50
001 23 4
t, TIME (ms)
VALUE (%)
tr s
tP
PEAK VALUE - IPP
HALF VALUE - IPP
2
PULSE WIDTH (t
P) IS DEFINED
AS THAT POINT WHERE THE
PEAK CURRENT DECAYS TO 50%
OF IPP
.
I
I
V
I
I
I
100
80
60
40
20
002 55 07 51 00 1251 50 175 200
PEAK PULSE DERATING IN % OF
PEAK POWER OR CURRENT @ TA= 25 C°
TA, AMBIENT TEMPERATURE (°C)
s1 ms 10 ms
100
10
1
t, PULSE WIDTH
PPK, PEAK POWER (kW)
NONREPETITIVE
PULSE WAVEFORM
SHOWN IN FIGURE 5
s
"
"
≤
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
TVS Diodes
Axial > 1500W > 1N5908
Figure 5. Typical Derating Factor for Duty Cycle Typical Protection Circuit
DERATING FACTOR
1 ms
10 s
1
0.7
0.5
0.3
0.05
0.1
0.2
0.01
0.02
0.03
0.07
100 s
0.10 .2 0.52 51 05 00 01021
D, DUTY CYCLE (%)
PULSE WIDTH
10 ms
Vin VL
Zin
LOAD
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
TVS Diodes
Axial > 1500W > 1N5908
Electrical Characteristics (TA = 25 ° C unless otherwise noted, VF = 3.5 V Max. @ IF (Note 3) = 53 A)
Device
(Notes 4)
VRWM
(Note 5)
I
R
@V
RWM
Breakdown Voltage VC (Volts) (Note 7)
VBR (V) (Note 6) @IT@ IPP =
120 A @ IPP = 60 A @ IPP = 30 A
(Volts) (µA) Min Nom Max (mA)
1N5908 5.0 300 6.0 - - 1. 0 8.5 8.0 7. 6
3. Square waveform, PW = 8.3 ms, Non-repetitive duty cycle.
4. 1N5908 is JEDEC registered as a unidirectional device only (no bidirectional option)
5. 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.
6. VBR measured at pulse test current IT at an ambient temperature of 25°C and minimum voltages in VBR are to be controlled.
7. Surge current waveform per Figure 4 and derate per Figure 2 of the General Data - 1500 W at the beginning of this group
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
TVS Diodes
Axial > 1500W > 1N5908
Dimensions
Part Marking System
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. LEAD FINISH AND DIAMETER UNCONTROLLED IN DIMENSION P.
4. 041A-01 THRU 041A-03 OBSOLETE, NEW STANDARD 041A-04.
Physical Specifications
Case Void-free, transfer-molded, thermosetting
plastic
Leads Modified L−Bend providing more contact
area to bond pads
Finish All external surfaces are corrosion
resistant and leads are readily solderable
Mounting Position Any
ORDERING INFORMATION
Device Package Shipping†
1N5908G Axial Lead
(Pb-Free) 500 Units/Box
1N5908RL4G Axial Lead
(Pb-Free) 1500/Tape & Reell
Flow/Wave Soldering (Solder Dipping)
Peak Temperature : 260ºC
Dipping Time : 1/16” from the case for 10 seconds
Dim
Inches Millimeters
Min Max Min Max
A0.335 0.374 8.50 9.50
B0.189 0.209 4.80 5.30
D0.038 0.042 0.96 1.06
K1.000 --- 25.40 ---
P--- 0.050 --- 1.27
D
K
P
PA
K
B
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: www.littelfuse.com/disclaimer-electronics.
