Type PCF
1. Scope of Application
This specification relates to non-flammable coated, insulated type, fixed
ceramic resistors (type PCF) manufactured by KOA T&T Corporation.
2. Dimension and Construction
L
Ceramic Body
l
Type
d
PCF1/2
PCF1
PCF2
Marking
Flame Retardant Coating
C
End
Cap
Lead
Wire
L
.354±.039
(9.0±1.0)
0.65±.039
(16.5±1.0)
.748±.039
(19.0±1.0)
D
Dimensions
inches
(mm)
C (max.)
D
d (no
.437
(11.1)
.748
(19.0)
.886
(22.5)
.138±.02
(3.5±0.5)
.217±.039
(5.5±1.0)
.276±.039
(7.0±1.0)
.02
(0.7
.03
(0.8
Type Designation
Allowable uncoated area
of resistor end surface
1/2
1.5
1
2.2
D
unit: mm
3. Type Designation
The type designation shall be in the following form:
PCF
Type
1/2
Power
Rating
1/2
1
2
C
Termination
Material
C: SnCu
(Other termination
styles available,
contact factory
for options)
T631
Taping
T631
T52
R
Packaging
A: Ammo
R: Reel
102
Nominal
Resistance
2 significant
figures
+ 1 multiplier
Bolivar Drive
■
P.O. Box 547
■
Bradford, PA 16701
■
USA
■
814-362-5536
■
Fax 814-362-8883
■
www.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you o
Voltage
PCF1/2
PCF1
PCF2
0.5W
1.0W
2.0W
500V
700V
4.7Ω - 100KΩ
3.3Ω - 390KΩ
K: ±10%
M: ±20%
Voltage
200V
300V
400V
Voltage
400V
600V
800V
Voltage*
10kV
14kV
20kV
* Resistance to pulse: change shall be ±5% of the pre-test values. 1 sec. ON, 1 second OFF, 20,000 cycles.
The voltage is applied with maximum pulse voltage.
5. Characteristics
No.
1
Requirement
(MIL-STD 202)
Resistance
(Method 303)
Characteristics
Resistance to the
nominal resistance
should be in each
resistance tolerance
shown below.
Resistance
Tolerance
± 10%
± 20%
Test Method
In the event of a difference in resistanc
attributable to the test voltage used, the
test voltage listed below shall be used.
Nominal Resistance
Recommen
Range
Voltages (
3.3 to 9.1 ohms
10 to 91 ohms
100 to 910 ohms
1k to 9.1k ohms
10k to 91k ohms
100k to 1M ohms
K
M
2
Temperature
Coefficient
(Method 304)
0.
1.
3.
3.
3.
3.
-1300 ± 300ppm/°C
Resistors shall be maintained within ± 1
ambient temperatures listed below. The
forced circulating air is recommended t
temperature stability and uniformity. Re
measurements shall be made at each t
15 minutes after air temperature has st
the specified temperature.
The percent difference in resistanc
to the resistance at +25°C shall be com
the following formula:
Percent Resistance = (R-r) x 1
Difference
r
Where: R is the resistance at test temp
r is the resistance at +25°C
Sequence
1
2
3
4
5
Ambient Te
+25
-40
+25
+75
+125
Bolivar Drive
■
P.O. Box 547
■
Bradford, PA 16701
■
USA
■
814-362-5536
■
Fax 814-362-8883
■
www.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you o
3
Voltage Coefficient
from 1k ohms ~
(Method 309)
0 ~ -0.2%/V
The resistance shall be measured at on
RCWV and at full RCWV. Application o
shall be momentary to minimize heatin
The resistance - voltage coefficien
calculated with the following formula:
Voltage Coefficient =
(R-r) x
Percent Per Volt
r x 0.9 (R
Where: R is the resistance at full RCW
r is the resistance at one-tenth
4
Short Time Overload
Within
± (2% + 0.05 ohm)
A well regulated DC or sine wave RMS
2.5 times the RCWV, but not exceeding
values listed in Table 1, shall be applie
seconds. Resistance shall be measure
and approximately 30 minutes after the
of the test voltage.
Test Item
Tensile
Strength
Bending
Strength
Lead wire (D) (mm)
Ø 0.6, 0.7 Ø 0.8
10N
20N
(1.02kgf)
(2.04kgf)
0.51kgf
–––––––
–––––––
1.02kgf
5
Terminal Strength
(Method 211)
Resistance change shall
be ± (1% + 0.05 ohm) of
the Pre-test value, with
no terminal loosening,
and lead-wire break-
down developing.
Te
Me
30
5N
10
6
Vibration
(Method 201)
Resistance change shall
be ± (2% + 0.05 ohm) of
the Pre-test value, with
no terminal loosening
and lead-wire break-
down developing.
Initial resistance shall be measured. Th
shall be varied approximately logarithm
between the nominal limits of 10 to 55
a return sweep to 10 Hertz shall be trav
approximately 1 minute. This sweep cy
be performed repeatedly for 2 hours in
directions to perpendicular. Final meas
and examination for mechanical failure
made after the test.
7
Resistance to
soldering heat
(Method 210)
Resistance change shall
be ± (2% + 0.05 ohm)
of the Pre-test value with
no mechanical damage
in appearance and
marking.
Initial resistance shall be measured. Re
shall then be immersed, one at a time f
sec. each, in molten solder at +350°C ±
distance of 2 - 2.5mm from the resistor
resistance shall be measured 2 ± 1 hr.
immersions.
Bolivar Drive
■
P.O. Box 547
■
Bradford, PA 16701
■
USA
■
814-362-5536
■
Fax 814-362-8883
■
www.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you o
be covered with solder,
when judged visually.
immersed in melted solder at temperat
235 ±5°C for a period of 3 ± 0.5 sec. as
the point 2 - 2.5mm from the resistor bo
9
Resistance
to solvents
No evidence of
mechanical damage
in appearance and
marking.
1. Sample shall be immersed in ultras
solvents of 28kHz frequency, 150w (0.3
power at 35 ± 5°C for 2 minutes.
2. After samples shall be immersed in
solvents (following table) for 3 minutes,
shall be immediately wiped with a dry c
(velvet or gauze)
(Solvents)
1. Iso-proryle alcohol
2. 1-1-1 trichloroethane
10
Dielectric
withstanding voltage
(Method 301)
The resistor develops
no dielectric breakdown.
Resistance change shall
be ± (1% + 0.05 ohm)
of the Pre-test value.
The resistors shall be clamped in the tr
90°C metallic V-block of such size that
body does not extend beyond the ends
trough. The resistor leads shall be posi
that they are no closer to the V-block th
were parallel to the sides of the V-block
prevents unnecessary proximity of the
the block, while permitting complete se
the resistor body in the block.
Sine wave RMS voltages from an a
current supply at commercial line frequ
more than 100 Hertz as specified in Ta
be applied at the rate of approximately
per second between resistor terminals
together and the V-block, and held for 5
11
Flame-proof
(UL-492-2)
The coating cab withstand the overload test, with no possibilities of ig
1. Overload Test as per UL-492, Item 13:
A piece of cotton cloth (A piece of gauze untreated corresponding to
that measures 36 inches in width and 14 - 15 yards per pound) is wou
a resistor. Then, the resistor is applied with voltage which is increase
times, three times, . . . ten times the rated voltage at intervals of one
the resistor is broken down. If the cotton cloth is found igniting, the re
be considered unacceptable.
The coating is completely proof against any kind of heat sources
exposed to gas burner flames or heated red with nichrome wire woun
coating will not flame, nor soften and melt to drop.
2. Hot-wire Ignition Test as per UL-492-2, Item 9:
A nichrome wire (Mixture of Cr 20% and Ni 80% which measures 0.0
in diameter and 865 feet per pound, and having 1.61 ohm per foot) is
resistor at intervals of 1/4 inch so as to result in power consumption o
more. Then, the resistor is heated red with electricity supplied to the nic
Bolivar Drive
■
P.O. Box 547
■
Bradford, PA 16701
■
USA
■
814-362-5536
■
Fax 814-362-8883
■
www.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you o
value.
The voltage is applied with maximum p
voltage shown in Table 1.
10k ohm
SW
DC
C = 1000pF
13
Low Temperature
Operation
Resistance change shall
be ± 5% of the Pre-test
value.
Initial resistance shall be measured. Th
shall then be exposed to the air stream
3°C for 24 hours with no voltage applie
which the resistors shall be placed at ro
temperature, final resistance shall be m
14
Thermal Shock
(Method 107)
Resistance change shall
be ± (2% ± 0.05 ohm) of
the Pre-test value.
Initial resistance shall be measured. Th
shall be subjected to the temperature c
fied below for a total of five cycles, perf
tinuously. Temperatures in Steps 1 and
maintained by forced air circulation. Th
cold chambers shall be of such capacit
temperature will reach the temperature
in Table 4 within 2 minutes after the res
been placed in the appropriate chambe
resistance shall be measured approxim
hour after completion of the fifth cycle.
Thermal Shock Test Sequence
Step
Temperature (°C)
Tim
1
-40 ± 3
2
+25 ± 5
1
3
+85 ± 2
4
+25 ± 5
1
15
Moisture Resistance
Resistance change shall
be ± 5% of the Pre-test
value.
Initial resistance shall be measured bef
test. Resistors shall be exposed to a te
of 40 ± 2°C and a relative humidity of 9
1,000 hours. After removal from the ch
resistors shall be allowed to dry at room
for approximately one hour. Final resist
be measured.
Bolivar Drive
■
P.O. Box 547
■
Bradford, PA 16701
■
USA
■
814-362-5536
■
Fax 814-362-8883
■
www.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you o
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