Datasheet

Ceramic Resistor Division
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax [phone] • www.ohmite.com • [e-mail]
139
500 Series
Non-inductive Bulk Ceramic Slab Resistors
SPECIFICATIONS
Resistance Avg. Power @ Peak* Energy @ Peak* Weight
Type Range (Ω) 40°C Amb. (W) 40°C Amb. (J) Voltage (Grams)
502SP 0.2-110 30 150 900 15
503SP 0.3-190 45 290 1900 22.5
504SP 0.4-280 60 480 2800 30
506SP 0.8-450 90 800 4700 45
508SP 1.0-630 120 1100 6700 60
510SP 1.3-800 150 1400 8500 75
502AS 5–1,200 12 1,500 8,500 16
503AS 9–2,200 18 2,700 16,000 24
504AS 13–3,200 24 4,000 23,000 32
505AS 17–4,200 30 5,200 30,000 40
506AS 21–5,200 36 6,400 36,000 48
507AS 25–6,200 42 7,700 43,000 56
508AS 29–7,200 48 8,900 50,000 64
509AS 33–8,200 54 10,100 57,000 72
510AS 37–9,200 60 11,400 65,000 80
502BA 1.2K-110K 10 700 3,000
503BA 2.2K-210K 14 1,200 5,400
504BA 3.2K-300K 20 1,800 8,000
506BA 5.2K-490K 30 2,900 13,000
508BA 7.2K-680K 38 4,100 18,000
510BA 9.2K-870K 48 5,200 22,000
Packaged assemblies
Individual standard
components can be
packaged in series, par-
allel, or series/parallel
arrays to optimize ener-
gy and power dissipa-
tion in available space.
Custom assembly pack-
ages are available.
*Based on energy absorption in
less than 10 milliseconds. Energy
rating can be substantially greater
for longer pulses. Allowable peak
energy/voltage will depend on the
resistance value.
CHARACTERISTICS
Derating Surface Temperature Rise
Short Time Overload
Max. % change after 5 cycles – 10 times
rated power, 5 seconds on, 90 seconds
off
+2%
Load Life
Max. % chage after 1000 hrs. rated
power 1½ hours on; ½ hour off
+5%
Thermal Shock
Max. % change after 10 cycles -55°C to
+125°C
+3%
Moisture Resistance
Max. % change when tested per MIL-
STD-202, Method 103
+5%
Operating
Temperature
SP: -55˚C to +350°C
When required, Type SP material can with-
stand short periods of use at red-heat condi-
tions, i.e. up to 550 to 600°C
AS & BA: -55˚C to +230°C
Temperature
Coefficient
SP & AS: +0.0 to -0.08%/°C
BA: +0.0 to -0.2%/°C
Density
SP & AS: 2.2 – 2.4 gm/cc
BA: 2.2 – 2.6 gm / cc
Specific Heat
SP: 0.24 – 0.26 cal/gm°C
AS: 0.22 – 0.24 cal/gm°C
BA: 0.22 – 0.28 cal /(gm –°C)
Thermal
Conductivity
SP: 0.14 - 0.16 cal/(cm-˚C - sec)
AS: 0.003 – 0.006 cal/cm-°C-sec
BA: 0.14 – 0.16 cal /(c m –°C – sec )
Size
Standard units are 1" wide by 1/4" thick in
variable lengths of 2, 3, 4, 6, 8 and 10 inches.
Other lengths to 10" maximum are available.
Rated
Average
Power
SP: 15 watts per inch of length based on
350°C maximum operating temperature with
40°C ambient.
BA: based on 230°C maximum operating tem-
perature with 40°C ambient. Derate linearly to
0 Watts at 230°C
Peak Impulse
Current
SP: Max 1000 Amps
AS: Max 200 Amps
For applications requiring higher current rat-
ings contact factory.
Ambient Temperature (°C)
SP
AS
100
40
80
20
60
0
% Rated Power
40°
300 400100 2000
350° 230°
% Rated Power
AS
SP
Temperature Rise (°C)
200
100
350
150
50
250
300
0
0 20 40 60 80 100 120
Typical for Resistor
Midpoint with
Horizontal
Orientation in
Still Air