RT100KP100A View Datasheet(PDF) - Microsemi Corporation

Part Name

Description

Manufacturer

RT100KP100A

Preferred 100 kW Transient Voltage Suppressor for AIRCRAFT POWER BUS PROTECTION

Microsemi Corporation 

SCOTTSDALE DIVISION

RT100KP33A thru RT100KP400CA, e3

Preferred 100 kW Transient Voltage

Suppressor for AIRCRAFT POWER

BUS PROTECTION

NOTE:GTRhAisPPHPSP versus

time graph allows the

designer to use these parts

over a broad power

spectrum using the

guidelines illustrated in

App Note 104 on

Microsemi’s website.

Aircraft transients are

described with exponential

decaying waveforms. For

suppression of square-

wave impulses, derate

power and current to 66%

of that for exponential

decay shown in Figure 1.

tp – Pulse Time – sec.

FIGURE 1

Peak Pulse Power vs. Pulse Time

To 50% of Exponentially Decaying Pulse

INSTALLATION

Correct

FIGURE 3

TVS devices used across power lines are

subject to relatively high magnitude surge

currents and are more prone to adverse

parasitic inductance effects in the mounting

leads. Minimizing the shunt path of the lead

inductance and their V= -Ldi/dt effects will

optimize the TVS effectiveness. Examples

of optimum installation and poor installation

are illustrated in figures 3 through figure 6.

Figure 3 illustrates minimal parasitic

inductance with attachment at end of device.

Inductive voltage drop is across input leads.

Virtually no “overshoot” voltage results as

illustrated with figure 4. The loss of

effectiveness in protection caused by

excessive parasitic inductance is illustrated

in figures 5 and 6. Also see MicroNote 111

for further information on “Parasitic Lead

Inductance in TVS”.

TL Lead Temperature oC

FIGURE 2

POWER DERATING

Wrong

FIGURE 5

FIGURE 4

FIGURE 6

Copyright © 2007

10-03-2007 Rev B

Microsemi

Scottsdale Division

8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503

Page 3

Share Link: