TVS Diode Datasheet
© 2022 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 09/28/22
SMTOAK2 Series
Surface Mount – SMTO-263-2 kA
■ SMTO-263 package, footprint
compatible with industry
popular DO- 218AB package
■ V
BR
@ T
J
= V
BR
@25 °C
x (1+
αT x (T
J
- 25))
(αT:Temperature Coefficient,
typical value is 0.1%
■ Glass passivated chip junction
in modified TO- 263 package
■ ESD protection of data lines
in accordance with IEC
61000-4-2, 30 kV(Air), 30 kV
(Contact)
■ Fast response time: typically
less than 1.0 ps from 0 Volts
to V
BR
min
■ Excellent clamping capability
■ Low incremental surge
resistance
■ UL Recognized compound
meeting flammability rating
UL94 V-0
■ Meets MSL level 1, per
J-STD-020, LF maximum
peak of 260 °C
■ Surface mount package to
optimize board space
■ High temperature reflow
soldering guaranteed: 260
°C/10 sec at terminals
■ Matte tin lead–free plated
■ Halogen free and RoHS
compliant
■ Pb-free E3 means 2
nd
level
interconnect is Pb-free and
the terminal finish material is
tin (Sn) (IPC/JEDEC J-STD-
609A.01)
Parameter Symbol Value Unit
Current Rating
1
I
PP
2 kA
Steady State Power Dissipation on Infinite
Heat Sink at T
L
=75 ºC
P
D
15 W
Operating Junction and Storage
Temperature Range
T
J
, T
STG
-55 to 150 °C
Typical Thermal Resistance Junction to case
R
θJC
1. 8 °C/W
Bi-direcctional
The SMTOAK2 TVS Diode Series is housed in a modified
SMTO-263 package , achieving a compact mechanical
design and compatible with automated PCB assembly. The
SMTOAK2 series is designed to protect sensitive electronics
against surge events and inductive load switching voltage
transient events.
Note:
1. Rated I
PP
measured with 8/20 μs pulse.
Description
Features & Benefits
Maximum Ratings and Thermal Characteristics
(T
A
=25 °C unless otherwise noted)
Functional Diagram
Electrical Characteristics (T
A
=25 °C unless otherwise noted)
Designed to protect sensitive electronics from:
■ Over voltage surge transients
■ Inductive load switching voltage transients
Applications
Part
Number
Part
Marking
Stand off
Voltage
V
SO
Breakdown
Voltage V
BR
(Volts) @ I
T
Test
Current
I
T
Maximum
Peak Pulse
Current I
PP
(10/350 μs)
Maximum
Clamping
Voltage V
C
@ I
PP
(8/20 μs)
Maximum
Peak
Pulse
Current I
PP
(8/20 μs)
Maximum
Reverse
Leakage
I
R
@ V
R
Maximum
Temperature
coefficient of
V
BR
(V) Min Max (mA) (A) (V) (A) (μA) (%/C)
SMTOAK2-070C SM2K70C 70 78.20 86.02 5 250 130 2000 2 0.074
RoHS
Pb
e3
Agency Agency file number
E230531 (pending)
Agency Approvals
TVS Diode Datasheet
© 2022 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 09/28/22
SMTOAK2 Series
Surface Mount – SMTO-263-2 kA
I-V Curve Characteristics
T
J
- Initial Junction Temperature (ºC)
0
20
40
60
80
100
0255075100 125150
Peak Pulse Power (P
PP
) or Current (I
PP
)
Derating in Percentage %
Figure 1 - Peak Pulse Power Rating Curve
Ratings and Characteristic Curves (T
A
=25 °C unless otherwise noted)
Figure 2 - Peak Pulse Power Derating Curve
1
10
100
1000
0.00001 0.0001 0.001
P
PPM
-Peak Pulse Power (kW)
td-Pulse Width (sec)
8/20µs
10/350µs
10/1000µs
P
PPM
Peak Pulse Power Dissipation -- Max power dissipation
V
SO
Stand-off Voltage -- Maximum voltage that can be applied to the
TVS without operation
V
BR
Breakdown Voltage -- Maximum voltage that flows though the
TVS at a specified test current (I
T
)
V
C
Clamping Voltage -- Peak voltage measured across the TVS at a
specified I
PPM
(peak impulse current)
I
R
Reverse Leakage Current -- Current measured at V
R
Vc
V
BR
VR
IR
IT
Ipp
V
Vc
V
BR
VR
Ipp
IR
IT
Bi-directional
I