CD214B-T30ALF Bourns Inc., CD214B-T30ALF Datasheet - Page 4

• Manufacturer Part Number: CD214B-T30ALF
• Description: TVS Diodes - Transient Voltage Suppressors TVS Unidirect Diode 30VOLT
• Manufacturer: Bourns Inc.

Specifications of CD214B-T30ALF

• Polarity: Unidirectional
• Clamping Voltage: 48.4 V
• Operating Voltage: 30 V
• Breakdown Voltage: 33.3 V
• Termination Style: SMD/SMT
• Peak Surge Current: 12.4 A
• Peak Pulse Power Dissipation: 600 W
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 55 C
• Dimensions: 3.94(Max) mm W x 4.57(Max) mm L
• Package / Case: SMB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Electrostatic discharge (ESD) occurs when a
charge is exchanged between two objects of
unequal charge potential. ESD, most often
between people and metal objects, is a result of a
build-up of electrons that behave as a capacitor
when dielectric isolation is available. Manmade
materials such as the sole of a shoe achieve
dielectric isolation, while a person walking on
carpet creates kinetic energy. The International
Electro-technical Commission (IEC) developed
a human model ESD event that allows designers
to take adequate protection in their electrostatic
applications. The IEC defined the ESD discharge
impulse with a rise time of less than 1 ns
and decay time of 60 ns as highlighted in the
adjacent graph. The new standard, IEC61000-4-2
identifies four levels.
The different levels of the IEC61000-4-2 standard
are outlined below:
Integrated Circuit (IC) manufacturers of
electrostatic sensitive devices design a level of
protection into the IC to increase its robustness.
However, protection circuits add cost to the
device by consuming expensive silicon real estate.
IC manufacturers design to standards to protect
against board manufacturing processes such as
IEC61000-4-2 Level 1, a 2 kV contact voltage.
However, human body ESD voltages are nature-
determined and can be 15 kV or more which will
damage the IC.
IEC61000-4-2; Level 4 specifies an air discharge
up to 15 kV to take this into consideration.
It is common practice to protect all “people-
interactive” data ports to Level 4, thereby limiting
IEC61000-4-2 Level
Level 1
Level 2
Level 3
Level 4
Contact Voltage
(kV)
2
4
6
8
Air Discharge
Voltage (kV)
15
2
4
8
Key
Parameter
product damage and increasing the robustness
of the equipment. Therefore, the external ESD
protector becomes the first level of protection
with the IC providing residual second level
protection in the design.
100
4
D.C.
90
80
70
60
50
40
30
20
10
Transient
0
Peak Contact
Voltage
Current (A)
22.5
Transient
7.5
15
30
Current
0
50-100 MΩ
150 pF
Contact Current
@ 30 ns (A)
30
Time (ns)
12
16
4
8
Key
Parameter
330 Ω
TVS
60
V c
Contact Current
@ 60 ns (A)
D.U.T.
2
4
6
8
Clamped
Transient
Voltage
Protected
Load