OGP-1501 View Datasheet(PDF) - PerkinElmer Inc
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Description
Manufacturer
OGP-1501 Datasheet PDF : 8 Pages
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OGP Series
Table 1 shows ratings for
PerkinElmer’s OGP ceramic-metal
overvoltage spark gaps when they
are used in crowbar service. Note
that for each "family" type, a range is
shown for Static Breakdown Voltage
(SBV); for any given gap, there can
be only a single value for SBV.
For rating purposes, crowbar service
is defined as being single-shot or very
low repetition rate operation such
that gap heating is nil. For applica-
tions where the various discharge
parameters simultaneously approach
the values shown, gap life will be on
the order of 1000-5000 operations.
Longer life can be obtained when
operating at reduced power levels;
alternatively, operation at higher levels
is possible, but life will be reduced.
For applications involving repetitive
operation such that gap heating is
significant, the ratings of Table 2
apply. For discharge conditions simul-
taneously approaching the maxi-
mums shown, gap life is typically one
million to five million operations.
Again, a trade off exists between dis-
charge severity and service life.
PGP and PB Series
Table 3 shows ratings for
PerkinElmer’s PGP and PB Series
pulse overvoltage spark gaps. These
have been specifically designed to
protect critical components against
damage caused by fast high voltage
transients.
The dynamic breakdown voltage (the
voltage at which the gap breaks
down under transient conditions) is a
function of the rate of rise of the
applied voltage (dv/dt). In general, it
will be higher for higher dv/dt. The
breakdown time of these gaps is
much faster than that of conventional
overvoltage types, and their dynamic
breakdown voltage is relatively close
to their static breakdown voltage over
a wide range of operating conditions.
PGP Series: In single-shot protection
service, these gaps can divert a tran-
sient energy as high as 10 joules and
conduct a total charge as high as
300 millicoulombs. Dynamic break-
down voltage is typically less than
twice their static breakdown voltage
for applied voltage transients as fast
as 300 kilovolts per microsecond.
PB Series
Peak currents up to 1500 amperes
with current rise times on the order of
1-5 nanoseconds are possible. The
small size of these devices makes
them well suited for use on circuit
boards and in other applications
where space is restricted. For best
results the gap should be tightly cou-
pled across the component to be
protected. On nanosecond time
scales, the inductive drop across
even a few inches of excess wiring
can easily exceed the rated turn-on
voltage of the gap.
Typical rating for inter-electrode
capacitance is 3 pf, dynamic voltage
drop is 50 volts, and open circuit
resistance at 500 volts is 1000
megohms.
page 2
PerkinElmer Optoelectronics
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