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SMCJ7.5A датащи(PDF) 8 Page - Littelfuse

номер детали SMCJ7.5A
подробное описание детали  TVS Diode Products
Download  146 Pages
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производитель  LITTELFUSE [Littelfuse]
домашняя страница  http://www.littelfuse.com
Logo LITTELFUSE - Littelfuse

SMCJ7.5A датащи(HTML) 8 Page - Littelfuse

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4
Transient Voltage Suppression Diodes
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
4
Crowbar Device
The class of suppressors that exhibit a “crowbar”
characteristic is usally associated with 4-layer NPNP silicon
bipolar devices or gas plasma/GDT devices. Upon reaching
a threshold or breakover voltage, further increase in current
flow will cause the device to rapidly conduct with only a few
volts of forward drop. In essence, the line is momentarily
“short-circuited” during the transient event.
Operating Temperature Range
The minimum and maximum ambient operating temperature
of the circuit in which a device will be applied. Operating
temperature does not allow for the effects of adjacent
components, this is a parameter the designer must take into
consideration.
Capacitance
The property of a circuit element that permits it to store
an electrical charge. In circuit protection, the off-state
capacitance is typically measured at 1 MHz with a 2V bias
applied.
Reverse Standoff Voltage (V
R)
In the case of a uni-directional TVS diode, this is the
maximum peak voltage that may be applied in the ‘blocking
direction’ with no significant current flow. In the case of
a bi-directional transient, it applies in either direction. It is
the same definition as Maximum Off-state Voltage and
Maximum Working Voltage.
Breakdown Voltage (V
BR)
Breakdown voltage measured at a specified DC test current,
typically 1mA. Usually a minimum and maximum is specified.
Peak Pulse Current (I
PP)
Maximum pulse current which can be applied repetitively.
Usually a 10x1000μs double exponential waveform, but can
also be 8x20μs, if stated.
Maximum Clamping Voltage (V
C or VCI)
Maximum voltage which can be measured across the
protector when subjected to the Maximum Peak Pulse
Current.
Peak Pulse Power (P
PP)
Expressed in Watts or Kilowatts, for a 1ms exponential
transient (see figure 1, page 23) it is I
PP multiplied by VCL.
TVS Diode Terms & Definitions
1. Define Circuit Operating Parameters
Normal operating voltage type in DC or AC:
Device Type Required:
Uni-drectional
Bi-directional
Normal operating voltage in volts:
Maximum transient current (Ipp):
Maximum clamping voltage (Vc):
Required peak reverse surge power rating:
Product mounting type (package):
Operating temperature:
2. Narrow TVS Diode Series for the Application
Please refer to the product selection charts and data
sheets within this guide, factoring these key parameters:
Reverse Standoff Voltage
(V
R):
The device
V
R should be equal to, or great than, the
peak operating level of the circuit (or part of the circuit)
to be protected. This is to ensure that TVS Diode does
not clip the circuit drive voltage.
Peak Pulse Current
(I
PP):
The Peak Pulse Current
(I
PP) identifies the maximum
current the TVS Diode can withstand without damage.
The required
I
PP can only be determined by dividing the
peak transient voltage by the source impedance. Note
that the TVS Diode failure mechanism is a short circuit; if
the TVS Diode fails due to a transient, the circuit will still
be protected.
Maximum Clamping Voltage
(V
C):
This the peak voltage that will appear across the TVS
Diode when subjected to the Peak Pulse Current
(I
PP),
based on 10X1000us exponential waveform. The V
C of
each TVS Diode is identified in each series data sheet
electrical characteristics table.
3. Verify Ambient Operating Parameters
Ensure that the application voltage is less than or equal
to the device’s standoff voltage, and that the operating
temperature limits are within those specified by the device.
4. Verify Device Mounting Style and Dimensions
Please refer to the dimension drawings contained within
the data sheet of each series.
5.Test the Selected Device in Actual Application
Please contact Littelfuse if you would like assistance
with testing and verifying suitability of a Littelfuse device
within your product. We have extensive product testing lab
capabilities and technical expertise to assist you.
TVS Diode Selection Checklist


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