61
Use figure 3-12 connection inside the N1259A Test Fixture.
B. Starting from Application Test Library
This test approach starts measurements by using an Application Test Library, which
starts from the default setup parameters, and you have to customize the measure-
ment parameters depending on your requirements.
Setup and execute the test by following the next steps. The same instruction steps
are illustrated by the numbers on the "1. Starting from Application Test Library" side
of figure 3-15.
Step 1. Click the Application Test tab.
Step 2. Check the PowerBJT category.
Step 3,4. Select Ic-Vceo_R (Click the Ic-Vceo_R then click Select )
Step 5. Set the test parameters shown in figure 3-15 to an appropriate one depend-
ing on your B1505A configuration and your test device.
The important check points are;
a. Collector SMU setup
b. Set Vc sweep parameters:
The VcStart voltage is set to 350 V to observe the breakdown characteris-
tics more precisely. The 350 V start voltage is higher than the Vc@Iceo,
and extracted Iceo is not accurate because it is measured at the first 350V
start voltage instead of the 200 V specified voltage.
For VcStop parameter setting:
When 100 kΩ resister is inserted to the collector, the voltage drop by the
resister must be added to the maximum sweep voltage of the collector
SMU.
Calculate the maximum sweep voltage required to the collector SMU by
the following formula:
XVceMax_R100k = VcStop + 100 k * IcLimit.
For example, in case VcStop=450 V and IcLimit = 8 mA, then
XVceMax_R100k = 450 + 100 k * 8 m = 1,250 V
c. Set the collector voltage to extract Iceo: Vc@Iceo,
Set the collector current to detect and measure BVceo: Ic@BVceo
Note: The maximum current of HVSMU is 8 mA in 1500V range, and it is
less than the 50 mA specification current to test Bce(sus) or BVceo.
d. Set the collector resister: Set "100 kΩ" in the second trial.
Note: If 0 k
Ω
is used, we need to change the cable connection inside the
N1259A Test Fixture.
e. Set Integration time: IntegTime.
3-1-4-B. Measurement Procedure: Ic-Vceo_R Application Test with 100 kΩ
ΩΩ
Ω series collector resistor
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