TVS Diode Array
Lightning Surge Protection- AQ4021 Series
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/12/21
Description
Applications
The AQ4021 components integrate low capacitance
steering diodes with one or two avalanche breakdown
diodes for unidirectional or bidirectional protection,
respectively, to protect against ESD and lightning induced
surge events. These components can safely absorb up
to 25A per IEC 61000-4-5 2
nd
edition (t
p
=8/20μs) without
performance degradation and a minimum ±30kV ESD
per IEC 61000-4-2 International Standard. The low loading
capacitance and high surge capability make it ideal for
protecting telecommunication ports such as Ethernet and
other high speed data interfaces.
Features
• ESD, IEC 61000-4-2,
±30kV contact, ±30kV air
• EFT, IEC 61000-4-4, 40A
(5/50ns)
• Lightning, IEC 61000-
4-5 2
nd
edition, 25A
(t
P
=8/20μs)
• Low capacitance of 2.5pF
(@ V
R
=0V)
• Low leakage current
• Unidirectional and
bidirectional configuration
• Small SOD323 package
fits 0805 footprints
• AEC-Q101 Qualified
• Moisture Sensitivity
Level(MSL -1)
• Halogen free, lead free
and RoHS compliant
���10/100/1000 Ethernet
•T1/E1/T3/E3
•USB 1.1/2.0
•Power Ports
•Computers and Peripherals
•Instrumentation
•Medical Equipment
•CAN Bus protection
•Automotive applications
Pinout
Life Support Note:
Not Intended for Use in Life Support or Life Saving Applications
The products shown herein are not designed for use in life sustaining or life saving
applications unless otherwise expressly indicated.
RoHS
Pb
GREEN
AQ4021 Series 2.5pF, 25A Discrete TVS Diode
Functional Block Diagram
1
2
1
2
Unidirectional Bidirectional
SP4021-01FTG SP4021-01FTG-C
AQ4021-01FTG AQ4021-01FTG-C
Pin 1
Pin 2
TVS Diode Array
Lightning Surge Protection- AQ4021 Series
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/12/21
Notes:
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the component. This is a stress only rating and operation of the component at these or any
other conditions above those indicated in the operational sections of this specification is not implied.
Absolute Maximum Ratings
Symbol Parameter Value Units
I
PP
Peak Current (t
p
=8/20μs) 25 A
P
Pk
Peak Pulse Power (t
p
=8/20μs) 600 W
T
OP
Operating Temperature -40 to 150 °C
T
STOR
Storage Temperature -55 to 150 °C
Electrical Characteristics (T
OP
=25ºC)
Parameter Symbol Test Conditions Min Ty p Max Units
Breakdown Voltage V
BD
I
R
=2uA 6.3 V
Reverse Standoff Voltage V
RWM
I
R
≤1μA 5.0 V
Leakage Current I
LEAK
V
R
=5.0V 0.5 μA
Clamp Voltage
1
V
C
I
PP
=1A, t
p
=8/20µs, Fwd 9.3 V
I
PP
=10A, t
p
=8/20µs, Fwd 14.0 V
I
PP
=25A, t
P
=8/20μs, Fwd 20.5 V
Dynamic Resistance
2
R
DYN
TLP, t
P
=100ns, I/O to GND 0.35 Ω
ESD Withstand Voltage
1
V
ESD
IEC 61000-4-2 (Contact Discharge) ±30 kV
IEC 61000-4-2 (Air Discharge) ±30 kV
Diode Capacitance
1
C
D
Reverse Bias=0V, f=1MHz 2.5 pF
Normalized Capacitance vs. Bias Voltage
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Normalized Capacitance
Bias Voltage (V)
SP4021-01FTG SP4021-01FTG-C
Note:
1. Parameter is guaranteed by design and/or component characterization.
2. Transmission Line Pulse (TLP) with 100ns width, 2ns rise time, and average window t1=70ns to t2= 90ns
AQ4021-01FTG
AQ4021-01FTG-C
8/20μs Pulse Waveform
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
110%
0.0 5.0 10.0 15.0 20.0 25.0 30.0
Time (μs)
Percent of I
PP