Breakdown voltages of MOS and BJT

bjt breakdown

Where can I get a reference to interpret and use the breakdown voltage specifications and where they are useful? Like the interpretation of BVdss, BVceo, BVebo, etc.
Any useful suggestions will be appreciated. Thanks !

mos breakdown voltage measure

hi,
breakdown voltages will be found in datasheets,selection guides and data books.
i recommend you the ECA books or CD roms.
TeE ThE EdE

break down voltage of bjt

HI DEAR,


I THINK THIS INFORMATION SHOULD HELP YOU,


Dielectric Breakdown Voltage
Background:
The dielectric breakdown voltage is a measure of an insulating fluids ability to withstand a high electric field stress without breaking down. It can also indicate the presence of water or other contaminants in the oil; There are two methods recognized by ASTM for this method. The first method uses disk electrodes with a voltage ramp of 3000 V/s (ASTM D 877) and the second method uses spherical electrodes with a voltage ramp of 500 V/s (ASTM D 1816).

Procedure:

The details of the entire procedures for determining the dielectric breakdown voltage of oil using disk electrodes are given in the ASTM D 877 standard and for the spherical electrodes in the ASTM D 1816 standard and both are only briefly mentioned here.

The disk electrode system utilizes 25 mm diameter square-edged disks separated by 2.5 mm. The cell is filled with oil to cover the electrodes to at least a depth of 20 mm and the sample is allowed to set for at least 2 minutes without agitation. A 60 Hz sinusoidal wave voltage is applied at a ramp rate of 3000 V/s until breakdown occurs as indicated by passage of a current through the sample of 2 to 20 mA. This occurrence is used to trip a relay within 3 to 5 cycles that stops the voltage ramping and maintaining the breakdown voltage. A series of determinations are done, which are then treated statistically to yield the final value.

The spherical electrode system utilizes electrodes that have a 25 mm radius and are spaced either 1 or 2 mm apart. The cell should be filled with enough oil to cover the top of the electrodes with at least 13 mm of oil. The cell shall be equipped with a propeller to circulate the oil in a downward direction during the testing procedure. A 60 Hz sinusoidal wave voltage is applied at a ramp rate of 500 V/s until breakdown occus as indicated by a passage of current through the sample of 2 to 20 mA. This occurrence is used to trip a relay that stops the voltage ramping and maintains the value of the breakdown voltage. A series of determinations are done, which are then treated statistically to yield the final value.

Significance:

The more uniform electric field of the spherical electrode system makes this method more sensitive to the presence of water or other conducting particulate material in the fluid. It is for this reason that the oil must be circulated during the measurement to insure that any particles are uniformly suspended in the oil. The two different ASTM methods have different purposes and should be used accordingly. The ASTM D 1816 method is recommended for testing filtered, degassed, and dehydrated oil prior to and during the filling of power systems rated above 230 kV and for testing of samples from units that are in service. This method should not be used for acceptance testing of insulating fluids. The ASTM D 877 method should be used for acceptance testing and it should not be used for units in service

mos breakdown voltage .edu

Sorry but I was looking for the MOS, BJT breakdown voltages and using them, their significance and what exactly do they mean.

bjt bvebo

hi

u will get the breakdown voltages from electronic books. i'll give u da names of some books u'll check it out
1. microelectronics by SEDRA SMITH
2. check in FLOYD
3. KEN MARTIN

U'll DEFINITELY get it

asim