DISTRONICA – SEMTEX INTERNATIONAL – OHMITE
Resistencias Ceramicas Series 500SP (NON-INDUCTIVE BULK CERAMIC SLAB RESISTORS SERIES 500SP)
Type 500SP non-inductive slab resistors
The type 500SP series slab resistor design enables the designer to minimize resistor
package size and cost while providing unequalled high power performance and reliability.
Typical applications for 500SP slab resistors are:
- Motor drive control resistors
- Power supply resistors
- Power generation/conditioning equipment resistors
- Power converter resistors
- Inverter resistors
- In-rush current limit resistors
- Soft start resistors
- Dynamic braking resistors
- RC snubber resistors
- RF dummy load resistors
- Capacitor charge/discharge resistors
| Product characteristics | |
| Operating temperature | -55°C to +350°C (-67 to 662°F) |
| Temperature coefficient | + 0.2 to – 0.08 %/°C |
| Short time overload 1) | ±2% |
| Load life 2) | ±5% |
| Thermal shock 3) | ±3% |
| Moisture resistance 4) | ±5% |
Note: When required, type SP material can withstand short periods of use at red-heat conditions,
i.e. up to 550-600°C (1031-1112°F)
1) Max. % change after 5 cycles – 10 times rated power, 5 seconds on, 90 seconds off
2) Max. % change after 1000 hrs. rated power 1-1/2 hours on; 1/2 hour off
3) Max. % change after 10 cycles -55 to +125°C (-67 to 257°F)
4)Max. % change when tested per MIL-STD-202, Method 103
| Physical properties (nominal) | |
| Density | 2.2-2.4 gm/cc |
| Specific heat | 0.24-0.26 cal/gm°C |
| Thermal conductivity | 0.14-0.16 cal/cm/°C/sec |
