World Products Inc. 19654 8th St. East, Sonoma, CA, USA, 95476 . . Phone: (707) 996-5201 . . Fax: (707) 996-3380
Transient Voltage Suppression Diodes
The Protection Products Group of World Products Inc. is committed to providing the optimum products for your
transient/surge protection problems. Our TVS Diode satisfies the toughest requirements for a low clamping device and
provides superior performance in all applications.
World Products expands your options . . . .
Large selection of equivalents to essentially all TVS Diodes. World
Products specifications are designed to provide all of the necessary physical and electrical parameters required for
proper component selection.
Discover why the first choice in TVS Diodes is WPI.
Table of Contents
General
Information
Selecting the Correct Part Type,
Definition of Terms, General
Characteristics.
Axial Type
P4KE Series
SA Series
P6KE Series
1.5KE Series
3KP Series
5KP Series
15KP Series
400 Watt
500 Watt
600 Watt
1500 Watt
3000 Watt
5000 Watt
15000 Watt
Surface Mount
P6SMBJ Series
1.5SMCJ Series
P4SMAJ Series
3.0SMCJ Series
Circuit Examples
600 Watt
1500 Watt
400 Watt
3000 Watt
Data Line Protection, AC Line Protection, Telecom Circuit Protection
World Products Inc. 19654 8th St. East, Sonoma, CA, USA, 95476 . . Phone: (707) 996-5201 . . Fax: (707) 996-3380
Transient Voltage Suppression Diodes
General Information
TVS Diode Technology
World Products Transient Voltage Suppression (TVS) Diodes are silicon avalanche devices designed, manufactured,
specified and tested according to voltage suppression applications.
These devices, with their fast response and low clamping characteristics, protect all MOS technology based devices,
hybrids, and other voltage sensitive components. The low clamping factor and pico-second response time of World
Products TVS Diodes clamps transient pulses early and maintains them at an acceptable level for their entire duration. In
other overvoltage protection devices, response times are delayed by 24nS to 2µs allowing transients to reach dangerous
levels. World Products TVS Diodes are designed to meet a 1.30 maximum clamping factor at their rated peak impulse
current. This can be compared to clamping factors of 2 to 5 found in other protection devices.
TVS Diode Applications
TVS Diodes are the optimum choice in protecting computer or data processor circuits and power supplies, airframe
avionics and controls, numerically controlled machines, telecom circuits, and many other applications. These devices are
designed to protect against transient voltages generated by lightning, electro-static discharge (ESD), and inductive
switching.
Selecting the Correct Part Type
The following guidelines should be observed in selecting the correct diode:
TVS Parameters
1. Stand-off Voltage (Vwm) >=
2. Peak Pulse Current (Ippm) >=
3. Clamping Voltage
(Vc)
=<
Application Parameters
Operating Voltage
(Vop)
Source Transient Current (Is)
Voltage Withstand
(Vws)
1. If the stand-off voltage is less than the operating voltage of the application, the diode will continually clamp the
circuit voltage.
2. The Peak Pulse Current (Ippm) is the maximum current the TVS can handle. The source transient current is
determined by dividing the peak transient voltage by the source impedance - this is often difficult to determine. In
many cases, however, this may be obtained from industry standard documents, customer requirements, etc.
3. Determine the maximum voltage level that the protected device can withstand (Vws). Select a suppressor which will
clamp the transient at a lower level (Vc).
Consider the transient source: lightning, electro-static discharge, inductive switching or nuclear explosion (NEMP). Often,
a 1500 watt peak pulse rated device will protect against transients due to secondary lightning effects or inductive switching
on power, data and telephone lines. A 500 watt device is sufficient to protect sensitive components against transients
generated by electro-static discharge.
World Products Inc. 19654 8th St. East, Sonoma, CA, USA, 95476 . . Phone: (707) 996-5201 . . Fax: (707) 996-3380
Transient Voltage Suppression Diodes
General Information - (Continued)
Schematic Symbols
Definitions of Terms
Vc Clamping Voltage:
Peak voltage across the suppressor measured at a specific Ippm. (Note: due to thermal, reactive or other effects, peak
voltage and peak current are not necessarily coincident in time.)
Ipp Peak Impulse Current:
Peak current measured using a specified waveform.
Ippm Rated Peak Impulse Current:
Rated maximum value of peak impulse current (Ipp) applied using a 10 x 1000µs waveform. (Minimum of 10 pulses
applied.)
Vwm Rated Standoff Voltage:
Maximum working (continuous) DC or peak voltage which may be applied over the standard operating temperature
range. (Note: Vwm of a selected device must be greater than or equal to the maximum operating voltage of the line to
be protected.)
Id Stand-By Current:
Maximum current that flows through the suppressor at rated standoff voltage (Vwm) at a specified temperature.
Vbr Breakdown Voltage:
The voltage measured across the suppressor at a specified DC test current (It).
It Test Current:
The specific DC current applied to the suppressor used to determine breakdown voltage (Vbr).
World Products Inc. 19654 8th St. East, Sonoma, CA, USA, 95476 . . Phone: (707) 996-5201 . . Fax: (707) 996-3380
Transient Voltage Suppression Diodes
General Information - (Continued)
Vbr Temperature Coefficient:
The ratio of change in breakdown voltage (Vbr) to changes in temperature. Expressed either as millivolts per degree
centigrade (mV/°C) or percent change in breakdown voltage per degree centigrade (%Vbr/°C).
Cf Clamping Factor:
Ratio of the measured clamping voltage (Vc) at specified peak pulse current (Ipp) to breakdown voltage (Vbr) on a
specific device.
Vc
Cf = -----
Vbr
C Capacitance:
Capacitance between the two terminals of a suppressor measured at a specific frequency and bias voltage.
Pppm Rated Multiple Peak Pulse Power:
Derived by multiplying the maximum clamping voltage (Vc) times the Rated Peak Impulse Current (Ippm).
Ifsm Rated Forward Surge Current:
Unidirectional devices only. Maximum forward current during a 8.3ms half sine wave of AC line frequency (60Hz).
Impulse Current Waveform
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