Specifications are subject to change without notice.

Customers should verify actual device performance in their specific applications.

Reference Application

voltage surges in DC biased equipment, as shown in the figure

below. Diode D1 prevents reverse voltage surges from damaging

surges from causing damage. An overvoltage protection device,

such as an MOV, may be used to provide additional overvolt-

age protection if the surge voltage is likely to be above the

should be greater than that of the OVP device at the maximum

surge current level. Typically, a 1N4007 is a suitable choice. D2

should be chosen to be above the normal working voltage of

the protected device, but below its absolute maximum rating.

device operates in approximately 1 µs - once line current

voltages and any other voltages including the surge up to

rated limits.

vice will automatically reset on lines which have no DC bias or

surge. In such cases, special care needs to be taken to ensure

manual power down will be required. Bourns application

engineers can provide further assistance.

Basic TBU Operation

Performance Graphs

V-I Characteristic - TBU-KE050-300-WH (Pin 2-1)

Typical Trigger Current vs. Temperature

CURRENT

(100 mA/div.)

VOLTAGE

(5 v/div.)

VRESET

ITRIGGER

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

-75 -50 -25

0

25

50

75 100 125 150

Junction Temperature (°C)

Equip.

OVP

Line

Side

12

D2

D1