BU323Z

http://onsemi.com

3

Icer Leakage Current

250 V

300 V

340 V

= 400 V

By design, the BU323Z has a built−in avalanche diode and

a special high voltage driving circuit. During an

auto−protect cycle, the transistor is turned on again as soon

as a voltage, determined by the zener threshold and the

network, is reached. This prevents the transistor from going

into a Reverse Bias Operating limit condition. Therefore, the

device will have an extended safe operating area and will

always appear to be in “FBSOA.” Because of the built−in

an unfamiliar shape compared to standard products as

shown in Figure 1.

Figure 2. Basic Energy Test Circuit

MERCURY CONTACTS

WETTED RELAY

MONITOR

L INDUCTANCE

(8 mH)

SOURCE

SOURCE

0.1

Ω

NON

INDUCTIVE

MONITOR

the inductance, are applied according to the Device Under

test system while making sure the load line remains within

the limits as described in Figure 4.

Note: All BU323Z ignition devices are 100% energy

tested, per the test circuit and criteria described in Figures 2

and 4, to the minimum guaranteed repetitive energy, as

specified in the device parameter section. The device can

sustain this energy on a repetitive basis without degrading

any of the specified electrical characteristics of the devices.

The units under test are kept functional during the complete

test sequence for the test conditions described:

Figure 3. Forward Bias Safe Operating Area

1000

340V

100

10

0.001

0.01

0.1

1

10

250ms

10ms

1ms

300

μs

THERMAL LIMIT

SECOND BREAKDOWN LIMIT

CURVES APPLY BELOW