RT100KP33A thru RT100KP400CA, e3
SCOTTSDALE DIVISION
Preferred 100 kW Transient Voltage
Suppressor for AIRCRAFT POWER
BUS
PROTECTION
APPEARANCE
WWW .
Microsemi
.C
OM
DESCRIPTION
Microsemi’s 100 kW Transient Voltage Suppressors (TVSs) are designed
for aircraft applications requiring high power transient protection with a
comparatively small axial-leaded package size. This includes various
threats such as “Waveform 4” at 6.4/69 µs per
RTCA/DO-160E
Section 22.
It is also available with screening in accordance with MIL-PRF-19500 or
avionics screening as described in the Features section herein. It may also
be optionally acquired with RoHS Compliant (annealed matte-Tin finish)
with an e3 suffix added to the part number. Microsemi also offers a broad
spectrum of other TVSs to meet your needs.
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
FEATURES
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Available in both Unidirectional and Bidirectional
construction (Bidirectional with C or CA suffix)
TVS selection for 33 to 400 V Standoff Voltages (V
WM
)
Suppresses transients up to
100 kW @ 6.4/69
μs
Fast response with less than 5 ns turn-on time.
Optional 100%
screening for avionics grade
is available
by adding
MA
prefix to part number for added 100%
temperature cycle -55
o
C to +125
o
C (10X), surge (3X) in
each direction, 24 hours HTRB in each direction, and post
test (V
BR
and I
D
)
Options for
screening
in accordance with MIL-PRF-19500
for JAN, JANTX,
and
JANTXV
are also available by adding
MQ, MX, or MV prefixes respectively to part numbers.
Moisture classification is Level 1 with no dry pack required
per IPC/JEDEC J-STD-020B.
RoHS Compliant devices available by adding “e3” suffix
•
APPLICATIONS / BENEFITS
Protection from high power switching transients,
induced RF, and lightning threats with comparatively
small package size (0.25 inch diameter)
Protection from ESD and EFT per IEC61000-4-2 and
IEC61000-4-4
Pin injection protection per RTCA/DO-160E up to
Level 4 for Waveform 4 (6.4/69 µs) on all devices
Pin injection protection per RTCA/DO-160E up to
Level 5 for Waveform 4 (6.4/69 µs) on device types
RT100KP33A or CA up to RT100KP260A or CA
Pin injection protection per RTCA/DO-160E up to
Level 3 for Waveform 5A (40/120 µs) on all devices
Pin injection protection per RTCA/DO-160E up to
Level 4 for Waveform 5A (40/120 µs) on device types
RT100KP33 A or CA up to RT100KP64A or CA
Consult Factory for other voltages with similar Peak
Pulse Power capabilities.
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MAXIMUM RATINGS
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Peak Pulse Power dissipation at 25ºC: 100 kW at 6.4/69 µs
waveform in Figure 8 (also see figures 1 and 2)
Impulse repetition rate: 0.005
t
clamping
(0 volts to V
BR
min): <100 ps theoretical for
unidirectional and <5 ns for bidirectional
o
o
Operating & storage temperatures: -55 C to +150 C
Thermal resistance: 17.5C/W junction to lead, or 77.5C/W
junction to ambient when mounted on FR4 PC board with 4
mm
2
copper pads (1 oz ) and track width 1 mm, length 25
mm
Steady-state power dissipation: 7 Watts @ T
L
= 27.5
o
C or
1.61 Watts at TA =25
o
C when mounted on FR4 PC Board
described for thermal resistance above
Forward surge: 250 Amps 8.3 ms half-sine wave for
unidirectional devices only
Solder Temperatures: 260
o
C for 10 s maximum
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MECHANICAL & PACKAGING
CASE: Void free transfer molded thermosetting
epoxy meeting UL94V-O requirements
FINISH: Tin-Lead or RoHS Compliant matte-Tin
plating solderable per MIL-STD-750, method 2026
Polarity: Cathode marked with band for
unidirectional (no band required for bi-directional)
MARKING: Manufacturers logo and part number.
Add prefix MA, MQ, MX, etc., for screened parts.
WEIGHT: 1.7 grams (approximate)
TAPE & REEL option: Standard per EIA-296 for
axial package (add “TR” suffix to part number)
Package dimensions: See last page
RT100KP33 – 400CA, e3
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Copyright
©
2007
8-22-2007
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
RT100KP33A thru RT100KP400CA, e3
SCOTTSDALE DIVISION
Preferred 100 kW Transient Voltage
Suppressor for AIRCRAFT POWER
BUS
PROTECTION
GRAPHS
WWW .
Microsemi
.C
OM
P
PP
Peak Pulse Power vs. Pulse Time – kW
Non-Repetitive Pulse
Peak Pulse Power (P
PP
) or continuous
o
Power in % of 25
C
rating
NOTE: This P
PP
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.
T
L
Lead Temperature
o
C
FIGURE 1
Peak Pulse Power vs. Pulse Time
To 50% of Exponentially Decaying Pulse
FIGURE 2
POWER DERATING
Correct
INSTALLATION
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”.
Wrong
FIGURE 3
FIGURE 5
RT100KP33 – 400CA, e3
FIGURE 4
FIGURE 6
Copyright
©
2007
8-22-2007
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 3
RT100KP33A thru RT100KP400CA, e3
SCOTTSDALE DIVISION
Preferred 100 kW Transient Voltage
Suppressor for AIRCRAFT POWER
BUS
PROTECTION
WWW .
Microsemi
.C
OM
t
t – time
Note: frequency is 1MHz
t – time
t - Time
FIGURE 7 –
Waveform 3
FIGURE 8 –
Waveform 4
FIGURE 9 –
Waveform 5A
NOTE: The 1MHz damped oscillatory waveform (3) has an effective pulse width of 4
μs.
Equivalent peak pulse power at each of the pulse widths represented in
RTCA/DO-160E for waveforms 3, 4 and 5A (above) have been determined referencing Figure 1 herein as well as Application Notes 104 and 120 (found on
Microsemi’s website) and are listed below.
WAVEFORM
NUMBER
PULSE WIDTH
μs
PEAK PULSE
POWER
kW
340
100
70
3
4
5A
4
6.4/69
40/120
Peak Pulse Current
Conversion Factor *
from Rated I
PP
at 6.6/69 µs
3.40x
1.00x
0.70x
* Multiply by the conversion factor shown with reference to the maximum rated I
PP
in the Electrical Characteristics Table on page 2.
Note: High current fast rise-time transients of 250 ns or less can more than triple the V
C
from parasitic inductance effects (V= -Ldi/dt) compared to the
clamping voltage shown in the initial Electrical Characteristics on page 1 as also described in Figures 5 and 6 herein.
Also see MicroNotes 127, 130, and 132 on the Microsemi website (Support section) for further information on Transient
Voltage Suppressors with reference to aircraft industry specification RTCA/DO-160E.
DIMENSIONS
RT100KP33 – 400CA, e3
Copyright
©
2007
8-22-2007
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 4
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