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| Price | 0.25~0.3 USD/PC |
| MOQ | 5000PCS |
| Delivery Time | 10 workdays |
| Brand | AMPFORT |
| Place of Origin | Dongguan,Guangdong,China |
| Certification | ROHS |
| Model Number | SQP20W1000RJ |
| Packaging Details | Bulk |
| Payment Terms | T/T, Western Union, MoneyGram |
| Supply Ability | 100KKPCS Per month |
| Other product | SQP/SQM/SQH/SQZ/SLR/BPR/SQO | Place of Origin | Dongguan,Guangdong,China |
| Shape | Coaxial | Packaging Details | Bulk |
| Tolerance | 5% | Model Number | SQP20W1000RJ |
| Supply Ability | 100KKPCS Per month | Certification | ROHS |
| Name | Cement Resistor | Brand Name | AMPFORT |
| Payment Terms | T/T, Western Union, MoneyGram | Resistance | 1000 Ohm |
| Price | 0.25~0.3 USD/PC | Delivery Time | 10 workdays |
| Minimum Order Quantity | 5000PCS | Rated power | 20W |
SQP CR-L Ceramic Cased Cement Resistor 20W 1000 Ohm 5% For Charger Aging
What is cement resistor ?
In
fact,
cement
resistor
does
not
have
cement
itself,
but
why
is
it
called
cement
resistance?
(Wirewound
or
metal
oxide
film)
core,
package
filler,
soldering
lead
and
ceramic
shell,
etc.,
and
some
have
metal
brackets
outside.
Cement
resistor
packages
generally
have
two
types:
horizontal
and
vertical.
Cement
resistors
are
resistors
that
are
potted
with
cement,
that
is,
the
resistance
wire
is
wound
on
a
non-alkali
heat-resistant
ceramic
part,
and
the
outside
is
protected
by
heat-resistant,
moisture-resistant
and
corrosion-resistant
materials,
and
the
wire-wound
resistor
body
is
placed
in
a
square
shape.
Porcelain
frame,
with
special
non-flammable
heat
resistance.
Its
function
is
the
same
as
that
of
general
resistance,
but
it
can
be
used
in
occasions
with
large
current,
such
as
being
connected
in
series
with
the
motor
to
limit
the
starting
current
of
the
motor,
and
the
resistance
value
is
generally
not
large.
Cement
resistors
have
the
characteristics
of
large
size,
shock
resistance,
humidity
resistance,
heat
resistance,
good
heat
dissipation,
and
low
price.
They
are
widely
used
in
power
adapters,
audio
equipment,
audio
frequency
dividers,
instruments,
meters,
televisions,
automobiles
and
other
equipment.
Dimension Of The Cement Resistor 20W
| Watt | Dimensions(mm) | Resistance Range(Ω) | ||||
| L | W | H | Φd±0.05 | Wire Wound | Metal Oxide Film | |
| 1W | 14±1.0 | 6.5±1.0 | 6.5±1.0 | 0.50 | 0.1Ω~22Ω | 25Ω~56KΩ |
| 2W | 18±1.0 | 7.0±1.0 | 7.0±1.0 | 0.50 | 0.1Ω~22Ω | 25Ω~56KΩ |
| 3W | 22±1.0 | 8.0±1.0 | 8.0±1.0 | 0.68 | 0.1Ω~47Ω | 50Ω~100KΩ |
| 5W | 22±1.0 | 9.5±1.0 | 9.5±1.0 | 0.68 | 0.1Ω~47Ω | 50Ω~100KΩ |
| 7W | 35±1.5 | 9.5±1.5 | 9.5±1.5 | 0.68 | 0.5Ω~330Ω | 450Ω~100KΩ |
| 10W | 48±1.5 | 9.5±1.5 | 9.5±1.5 | 0.68 | 0.5Ω~450Ω | 470Ω~100KΩ |
| 15W | 48±1.5 | 13±1.5 | 13±1.5 | 0.68 | 1Ω~500Ω | 510Ω~100KΩ |
| 20W | 63±1.5 | 13±1.5 | 13±1.5 | 0.68 | 1Ω~600Ω | 620Ω~100KΩ |
| 30W | 75±2.0 | 19±2.0 | 17±2.0 | 0.68 | 1Ω~600Ω | 620Ω~100KΩ |
| 40W | 89±2.0 | 19±2.0 | 19±2.0 | 0.68 | 1Ω~600Ω | 620Ω~100KΩ |
Structure diagram Of The Cement Resistor 20W
The
construction
of
resistor
Cement
Type
Resistors
shall
be
as
follow:
|
NO |
Item | Material |
| 1 | Ceramic core | High alumina ceramic is used. |
| 2 | Resistor element |
The resistor element shall consist of metal oxide film or Resistance wire (Exemple:CN49W Φ1.0mm) . |
| 3 | Terminal | Tinned iron cap. |
| 4 | Connection | The lead wire,which is plated with solder,shall be mounted to the caps by welding process. |
| 5 | Lead wire t | Soldered or tinned annealed wire. |
| 6 | Silicon cement | Silicon resin is used. Accord with UL-94V-0 Nonflammable specification |
| 7 | Ceramic case | High thermal conductivity |
Features Of The Cement Resistor 20W
1,
shock
resistance,
moisture
resistance,
heat
resistance
and
good
heat
dissipation,
low
price
and
other
characteristics.
2.
Complete
insulation,
suitable
for
printed
circuit
boards.
3.
Winding
the
wire
on
the
porcelain
rod
and
then
welding
the
joint
to
produce
accurate
resistance
value
and
prolong
life.
4.
The
high
resistance
value
is
made
of
metal
oxide
film
body
(MO)
instead
of
winding.
5.
Excellent
heat
resistance,
small
temperature
coefficient
of
resistance,
and
linear
change.
6.
It
is
resistant
to
short-time
overload,
low
noise,
and
the
resistance
value
has
not
changed
over
the
years.
7.
Good
explosion-proof
performance
and
protection.
Shortcoming Of The Cement Resistor 20W
The
disadvantage
of
cement
resistance
is
that
it
is
large
in
size,
has
high
heat
generation
during
use,
is
easy
to
dissipate,
and
often
cannot
meet
the
requirements
of
precision
and
stability.
For
high-power,
small-volume
resistors,
or
high
precision
and
fast
heat
dissipation,
cement
resistors
can
be
replaced
with
JEPSUN
power
resistors,
3W,
20W,
30W,
50W,
100W,
and
even
more
power
can
be
achieved,
using
TO-220
,
TO-247
package,
high
accuracy,
strong
stability,
fast
heat
dissipation.
Cement
resistor
housings
are
generally
made
of
ceramics,
and
their
main
components
are:
alumina
Al2O3,
commonly
known
as
corundum
porcelain,
which
has
the
characteristics
of
fast
heat
dissipation
and
high
strength.
Function Of The Cement Resistor 20W
1:
The
function
of
the
power
supply
current
limiting,
usually
connected
to
the
main
voltage
+300V
and
the
E
and
C
poles
of
the
power
switch
tube,
the
function
is
that
the
power
supply
will
not
damage
its
components
when
it
is
turned
on.
2:
The
starting
resistance
of
the
power
supply,
the
resistance
between
the
power
tube
and
the
starting
circuit
is
connected
to
+300V,
the
voltage
drop
and
current
are
large,
so
the
cement
resistance
with
high
power
is
also
used.
3:
The
peak
pulse
absorption
circuit
between
the
power
switch
tubes
B,
C,
and
E
also
uses
a
high-power
cement
resistor,
which
also
protects
its
power
switch
tube.
4:
The
current
protection
circuit
is
generally
connected
between
the
E
pole
of
the
power
switch
tube
and
the
ground.
When
it
is
working
normally,
its
resistance
can
be
ignored,
because
the
resistance
of
the
resistance
is
very
small
and
there
is
no
current,
only
when
the
circuit
itself
and
the
load
are
short-circuited.
,
in
order
to
increase
the
current
of
the
E
pole
of
the
power
switch
tube,
so
that
the
protection
voltage
is
generated
at
both
ends
of
the
resistance
to
start
the
related
circuit.
Application Of The Cement Resistor 20W
Widely
used
in
power
adapters,
audio
equipment,
audio
frequency
dividers,
instruments,
meters,
televisions,
automobiles
and
other
equipment
Cement
resistors
are
usually
used
in
occasions
with
high
power
and
high
current,
including
2W,
3W,
5W,
10W
or
even
more
power,
such
as
air
conditioners,
TV
sets,
and
other
electrical
appliances
with
power
above
100
watts,
basically
all
use
cement
resistance.
