500 Series
Non-inductive Bulk Ceramic Slab Resistors
500 Series Non-Inductive Bulk Ceramic Slab
Resistors provide high power and energy dissipation in a compact size. The 500 Series
design enables the designer to minimize resistor package size and cost while providing
unequaled performance and reliability. The
slim, compact resistors offer a number of termination options allowing easy configuration
for specific requirements. Ohmite 500 Series
non-inductive bulk ceramic slab resistors provide excellent performance where high peak
power or high-energy pulses must be handled
in a small size. The advantage of the bulk
construction is that it produces an inherently
non-inductive resistor; and it allows energy and
power to be uniformly distributed through the
entire ceramic resistor body – there is no film
or wire to fail. We offer a full line of rugged,
reliable ceramic resistors – including custom
designs. Standard terminal mounting tabs are
tin plated steel which are soldered to the resistor body. Consult factory for other materials.
F E AT U R E S
• Inherently non-inductive, high reliability due to bulk
ceramic construction
• 15 watts per inch of length power dissipation (type SP)
• Excellent pulse/overload capability
• Slim profile for excellent volumetric power efficiency
• Resistance range from 0.2 to 870K (resistance range
dependent on material type)
• Resistance tolerances 10 and 20% standard on individual
components, available to ±2% on assemblies
M AT E R I A L T Y P E S
TYPE SP
TYPE AS
TYPE BA
Material composition type SP is
formulated to provide lower resistance values and higher derating
temperatures.The higher derating temperatures translates to a
higher wattage per inch than other
material types.
Material composition type
AS is formulated to provide
high voltage and high energy
absorption in a singular package.
Material composition type BA is formulated to withstand high energy and
high voltage applications where the
required resistance value is above the
resistance values available in Type
SP and Type AS resistors. Maximum
continuous operating temperature is
specified at 230°C.
Appplications
• Motor Drive Controls
• Power Supplies
• Power Conditioning Equipment
• Soft Start/Current Limit Circuits
• Dynamic Braking
• Snubber Circuits
• RF Dummy Load Circuits
• Capacitor Dump Circuits
138
Appplications
• High voltage power supplies
• Capacitor charge/discharge
• Pulse test equipment
• Radar/broadcast transmitters
• Laser/imaging equipment
Appplications
• DC Coupling and Filter Cap Discharge
• Voltage Balancing
• Pre-charge / Inrush Limit
• Voltage Divider
• Filter
• Snubber
• Crowbar
• Measuring
• EMI / EFI Test Circuits
• Test Loads
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
500 Series
Non-inductive Bulk Ceramic Slab Resistors
S P E C I F I C AT I O N S
Resistance
Avg. Power @
Type
Range (Ω)
40°C Amb. (W)
502SP 0.2-110
30
503SP 0.3-190
45
504SP 0.4-280
60
506SP 0.8-450
90
508SP 1.0-630 120
510SP 1.3-800 150
502AS 5–1,200
12
503AS 9–2,200
18
504AS 13–3,200
24
505AS 17–4,200
30
506AS 21–5,200
36
507AS 25–6,200
42
508AS 29–7,200
48
509AS 33–8,200
54
510AS 37–9,200
60
502BA 1.2K-110K
10
503BA 2.2K-210K
14
504BA 3.2K-300K
20
506BA 5.2K-490K
30
508BA 7.2K-680K
38
510BA 9.2K-870K
48
Peak* Energy @
40°C Amb. (J)
150
290
480
800
1100
1400
1,500
2,700
4,000
5,200
6,400
7,700
8,900
10,100
11,400
700
1,200
1,800
2,900
4,100
5,200
Packaged assemblies
Peak*
Weight
Voltage
(Grams)
900 15
1900 22.5
2800 30
4700 45
6700 60
8500 75
8,500 16
16,000 24
23,000 32
30,000 40
36,000 48
43,000 56
50,000 64
57,000 72
65,000 80
3,000
5,400
8,000
13,000
18,000
22,000
Individual standard
components can be
packaged in series, parallel, or series/parallel
arrays to optimize energy and power dissipation in available space.
Custom assembly packages are available.
*Based on energy absorption in
less than 10 milliseconds. Type SP
energy rating can be substantially
greater for longer pulses. Allowable
peak energy/voltage will depend on
the resistance value.
CHARACTERISTICS
Short Time Overload Max. % change after 5 cycles – 10 times
rated power, 5 seconds on, 90 seconds
off
Temperature SP & AS: +0.0 to -0.08%/°C
Coefficient BA: +0.0 to -0.2%/°C
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 SP: 0.14 - 0.16 cal/(cm-˚C - sec)
Conductivity 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 SP: 15 watts per inch of length based on
Average 350°C maximum operating temperature with
Power 40°C ambient.
BA: based on 230°C maximum operating temperature with 40°C ambient. Derate linearly to
0 Watts at 230°C
+5%
Thermal Shock Max. % change after 10 cycles -55°C to
+125°C
+3%
Moisture Resistance Max. % change when tested per MILSTD-202, Method 103
Derating
350
40°
80
60
SP
40
AS
20
0
230°
0
+5%
Surface Temperature Rise
100
% Rated Power
Density SP & AS: 2.2 – 2.4 gm/cc
BA: 2.2 – 2.6 gm / cc
+2%
Load Life Max. % chage after 1000 hrs. rated
power 1½ hours on; ½ hour off
Temperature Rise (°C)
Operating SP: -55˚C to +350°C
Temperature When required, Type SP material can withstand short periods of use at red-heat conditions, i.e. up to 550 to 600°C
AS & BA: -55˚C to +230°C
350°
100
200
300
Ambient Temperature (°C)
400
Peak Impulse SP: Max 1000 Amps
Current AS: Max 200 Amps
For applications requiring higher current ratings contact factory.
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
139
300
250
200
150
Typical for Resistor
Midpoint with
Horizontal
Orientation in
Still Air
SP
AS
100
50
0
0
20
40
60
80
% Rated Power
100
120
500 Series
Non-inductive Bulk Ceramic Slab Resistors
DIMENSIONS
Fig. 1
Fig. 2
Without Tabs
Length (L ± 1/16")
[L ± 1.6mm]
With Straight Radial Tabs (G1)
Length (L ± 1/16")
[L ± 1.6mm]
1/4" [6.4mm]
3/8" [9.5mm]
3/8" [9.5mm]
0.030''
[0.8mm]
Typical
1" [25.4mm]
Both Ends Aluminum
Hole Spacing
(L-3/8'') ±1/16''
[(L - 9.5mm) ±1.6mm]
20 Gage Steel
Riveted Tab, Tin-Plated
With Right Angle Radial Tabs – same direction – (G2)
Fig. 3
3/8'' [9.5mm]
Fig. 4
Length (L ± 1/16")
[L ± 1.6mm]
20 Gage Steel
Riveted Tab,Tin-Plated
0.22'' [5.6mm]
Dia. Hole
1/4'' [6.4mm] Nom.Hole Spacing
3/8" [9.5mm]
Length (L ± 1/16")
[L ± 1.6mm]
0.35''
[8.9mm]
0.19''
[4.8mm]
Fig. 6
Round Hole
0.275” Dia [7.0mm]
3/4"
[19.1mm]
20 Gage Steel,
Tin-Plated
20 Gage Steel Riveted
Tab, Tin-Plated
5/16"
[7.9mm]
Typical
1.5" Max.
[38.1mm]
5/16"
[7.9mm]
Typical
With Low Profile Axial Tabs (H1)
Fig. 5
0.030'' [0.8mm] Typical
0.22'' [5.6mm]
Dia. Hole
1.5" Max.
[38.1mm]
(L - 3/8") ±1/16"
[(L - 9.5mm) ±1.6mm]
0.22" [5.6mm]
Dia. Hole
With Right Angle Radial Tabs – opposite direction – (G3)
0.030'' [0.8mm] Typical
Length (L ± 1/16")
[L ± 1.6mm]
13/16"
[20.6mm]
(L - 3/8") ±1/16"
[(L - 9.5mm) ±1.6mm]
1/4'' [6.4mm] Nom. Hole Spacing
With Standoff Axial Tabs (H2)
Length (L ±1/16")
[L ±1.6mm]
3/8"
[9.5mm]
0.19''
[4.8mm]
0.19''
[4.8mm]
0.35'' x2
[8.9mm]
Slotted Hole
7/32 x 5/16"
[5.6 x 7.9mm]
1/4"
[6.4mm]
3/4"
[19.1mm]
Hole Spacing (L + 3/4") ±1/16''
[(L + 19.1mm) ±1.6mm]
1/4"
[6.4mm]
Hole Spacing (L +7/8") ±1/16''
[(L + 22.2mm) ±1.6mm]
3/4" [19.1mm]
20 Gage Steel, Tin-Plated
3/8" [9.5mm]
3/4" [19.1mm]
5/8" [15.9mm]
5/16" [7.9mm]
HOW TO ORDER
Material Type
AS, BA, or SP
Coating Options
D = Dielectric (AS and BA only)
O = Oil resistant
504SP101KDG1
Size/Length
502 = 2"
503 = 3"
504 = 4"
506 = 6"
508 = 8"
510 = 10"
(etc.)
Resistance (Ω)
Tolerance
For ≥10Ω: First 2 digits K = ±10%
are significant, third is L = ±20%
number of zeros to
follow, e.g. 101 = 100Ω
For