Space-Efficient Crowbar Protection
The MCG CB08 crowbar line addresses the need
to protect low voltage microelectronics from damaging overvoltage events,
usually caused by failing power supply regulation. Reacting to an
overvoltage in just microseconds, the unit protects even the most sensitive
circuits from damage. The CB08 series is available
in wide range of standard trip voltages. They are epoxy encapsulated with a
small footprint and a low-profile for easy OEM application.
(standard voltages in DC volts): 3.0, 3.7,
4.1, 4.3, 4.7, 5.5, 6.4, 7.9, 10.4, 13.5, 14.5, 15.4, 16.4, 18.4, 20.4,
22.4, 24.4, 26.4, 30.4, 32.4, 36.4, 40.4, 44.4, 48.4, 54.4, 60.4, 66.4,
72.4, 100, 120, 147, 167, 200, 220, 247, 287, 300, 340, 360
Vtrip tolerance: (T= 25oC (77oF)): +/- 5 %
(T= -10o to +60oC (14o to +140oF)): +/- 10 %
Response time: Less than 5 microseconds
I leakage (T= 25oC (77oF)) Vt = 3.0 thru 10.4V: < 6mA @ V = Vt – (10%
Vt > 10.4V: < 50 μA @ V = Vt – (10% Vt)
Hold Current (T= 25oC (77oF)): 18mA Typical, 40mA Max
Temperature (Operating/Storage): -40o to +70o C/-40o
to +85o C (-40o
to +158o F/-40o to +185oF)
Construction: Epoxy encapsulated, DAP (diallyl ortho phthalate)
Dimensions, Enclosure: 1.4”L x 0.9”W x 0.68”H (35.6mm L x 22.9mm W x
17.3 mm H)
Terminals: 0.255”L, 0.040”d (6.5mm L, 1.0mm d)
Model Buildup: CB08-20A/xxxVDC where xxx is the desired Vtrip.
APPLICATION NOTE: For most common applications, choose the crowbar
with the highest trip voltage (Vtrip) that the load can withstand
continuously without damage. Vtrip must be greater than the maximum voltage
(DC or peak) that the power supply provides nominally.
Example: Load is powered by 5VDC. Maximum power supply output is
5.5VDC during normal operation. Load can safely withstand 7.0 VDC
continuously. Choose model with Vtrip = 6.4VDC.