TransientVoltage Suppression Diodes
Surface Mount – 400W > SMAJ series
RoHS
Pb
SMAJ Series
Description
The SMAJ series is designed specifically to protect
sensitive electronic equipment from voltage transients
induced by lightning and other transient voltage events.
Features
• Halogen-Free
• RoHS compliant
• For surface mounted
applications to optimize
board space
• Fast response time:
typically less than 1.0ps
from 0 Volts to VBR min
•Typical IR less than 1µA
above 12V
• High temperature
soldering: 260°C/40
seconds at terminals
•Typical maximum
temperature coefficient
ΔVBR = 0.1% x VBR@25°C x ΔT
Agency Approvals
• Low profile package
• Built-in strain relief
• Glass passivated junction
• Low inductance
• Excellent clamping
capability
• 400W Peak Pulsepower
capability at 10 x 1000µs
waveform, repetition rate
(duty cycle): 0.01%
AGENCY
AGENCY FILE NUMBER
E230531
• Plastic package has
Underwriters Laboratory
Flammability 94V-O
• MatteTin Lead–free
Plated
Maximum Ratings andThermal Characteristics
(TA=25OC unless otherwise noted)
Parameter
Symbol
PPPM
Value
400
Unit
W
Peak Pulse Power Dissipation at
TA=25ºC by 10x1000µs waveform
(Fig.1)(Note 1), (Note 2)
Power Dissipation on infinite heat
sink atTA=50OC
Applications
PM(AV)
IFSM
3.3
40
W
A
TVS devices are ideal for the protection of I/O Interfaces,
CC bus and other vulnerable circuits used inTelecom,
Peak Forward Surge Current, 8.3ms
Single Half Sine Wave (Note 3)
V
Computer, Industrial and Consumer electronic applications.
Maximum Instantaneous Forward
Voltage at 25A for Unidirectional
only (Note 4)
VF
3.5V/6.5
V
Operating Junction and Storage
Temperature Range
TJ, TSTG -65 to 150
°C
TypicalThermal Resistance Junction
to Lead
RuJL
RuJA
30
°C/W
°C/W
TypicalThermal Resistance Junction
to Ambient
120
Notes:
1. Non-repetitive current pulse, per Fig.3 and derated aboveTA=25ºC per Fig. 2.
2. Mounted on 5.0x5.0mm copper pad to each terminal.
3. Measured on 8.3ms single half sine wave or equivalent square wave for unidirectional
device only.
4. VF < 3.5V for VBR <_ 200V and VF< 6.5V for VBR >_ 201V.
©2011 Littelfuse, Inc.
1
SMAJ Series
Revision: November 17, 2011, 16:25
Specifications are subject to change without notice.
Please refer to http://www.Littelfuse.com/series/SMAJ.html for current information.