200KP295CVCL and 200KP295CA
AIRCRAFT AC POWER BUS PROTECTION
SCOTTSDALE DIVISION
DESCRIPTION
Microsemi’s
200 kW
bidirectional Transient Voltage Suppressor (TVS)
protects 120 volt ac airborne electronic equipment from harsh lightning
environments per
RTCA/DO-160D
Section 22 and is compatible with
Section 16 for 180 volt ac 100 ms highline surges. Microsemi also
offers a broad spectrum of other TVS products to meet your needs.
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
APPEARANCE
WWW .
Microsemi
.C
OM
FEATURES
•
•
•
•
•
Symmetrical bidirectional TVS construction
Available as either low clamp with “CVCL” suffix or
normal clamping features with “CA” suffix.
Suppresses transients up to
200 kW @ 10/40 us
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
Z
and I
R
)
Options for
screening
in accordance with MIL-
PRF-19500
for JAN JANTX, JANTXV,
and
JANS
are also available by adding MQ, MX, MV, or MSP
prefixes respectively to part numbers
Moisture classification is Level 1 with no dry pack
required per IPC/JEDEC J-STD-020B
•
APPLICATIONS / BENEFITS
Pin injection protection per RTCA/DO-160D up to
Level 4 for Waveform 4 (6.4/69 µs) and Level 3 for
Waveform 5A (40/120
μs)
Compatible with “abnormal surge and variation from a
controlled steady-state level” as described in 16.5.3.3
of RTCA/DO-160D.
The 200KP295CVCL is designed for low clamping
protection of 400V transistors, MOSFETs and IGBTs
in off-line switching power supplies.
The 200KP295CA normal clamp device is for use in
less sensitive applications including RFI/EMI filters
and general across-the-line protection.
Secondary lightning protection per IEC61000-4-5 with
12 Ohms source impedance for Class 1,2, 3 and 4
Secondary lightning protection per IEC61000-4-5 with
2 Ohms source impedance for Class 2 and 3
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•
•
•
•
•
•
MAXIMUM RATINGS
•
•
•
•
•
•
Steady-state power dissipation: 7 W @ T
A
= 25
o
C
Peak Pulse Power at 25
o
C: 200 kW at 10/40 µs
(linear derate to zero @ 150
o
C)
Repetition rate: 0.01% max.
Operating & storage temperatures: -55
o
C to +150
o
C
Temperature coefficient of voltage: +0.100%/
o
C max
o
Solder Temperatures: 260 C for 10 s maximum
•
•
•
•
•
•
MECHANICAL & PACKAGING
CASE: Inner Shell – Epoxy Encapsulated.
Exterior Shell – Diallyl Phthallate, glass filled
Meets UL 94V-0 flammability requirements
FINISH: Tin-Lead plated readily solderable per
MIL-STD-750, method 2026
Polarity: No band required for bidirectional
MARKING: Manufacturers logo and part number
Add prefix MA, MQ, MX, etc., for screened parts
Package dimensions: See last page
ELECTRICAL PARAMETERS @ 25
o
C
Devices are Bi-directional
200KP295CVCL and
200KP295CA
Working
Standoff
Voltage
V
WM
V max
Maximum
Standby
Current
I
D
@ V
WM
μA
Minimum
Breakdown
Voltage
V
BR
@ I
(BR)
Volts
Breakdown
Current
I
(BR)
mA
Maximum
Clamping
Voltage
V
C
@ I
PP
Volts
Peak Pulse
Current
I
PP
@ 10/40
μs
Amps
MICROSEMI
PART NUMBER
200KP295CVCL
200KP295CA
295
295
5
5
300
300
5
5
410
460
300
300
Copyright
©
2004
8-08-2004 REV B
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
200KP295CVCL and 200KP295CA
AIRCRAFT AC POWER BUS PROTECTION
SCOTTSDALE DIVISION
GRAPHS
P
PP
Peak Pulse Power vs. Pulse Time – kW
Non-Repetitive Pulse
NOTE: This P
PP
vs. 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 waveforms, derate power and current to 66% of that for
exponential decay.
WWW .
Microsemi
.C
OM
Peak Pulse Power (P
PP
) or continuous
o
Power in % of 25
C
rating
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
DERATING CURVE
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
200KP295CVCL and
200KP295CA
FIGURE 4
FIGURE 6
Copyright
©
2004
8-08-2004 REV B
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 2
200KP295CVCL and 200KP295CA
AIRCRAFT AC POWER BUS PROTECTION
SCOTTSDALE DIVISION
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 for the 200KP295CVCL and
200KP295CA at each of the pulse widths represented in RTCA/DO-160D for wave forms 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
3
4
5a
PULSE WIDTH
μs
4
6.4/69
40/120
PEAK POWER
kW
500
150
120
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.
DIMENSIONS
200KP295CVCL and
200KP295CA
Copyright
©
2004
8-08-2004 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
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