Electrical & Physical Specifications:
| A-Length: |
20.62mm (.812") |
| B-Diameter: |
4.83mm (.190") |
| Lead Dimensions: |
.028" dia. X 1.500" long (min.) |
| Max Watts @ 1% Tol: |
2 |
| Max Volts @ 1% Tol: |
670 |
Temperature Range: |
-55°C. to +275°C |
| Resistance Range (Ω): |
.1 Min to 900K Max |
SM Series Engineering Attributes:
- RESISTANCE RANGE
- PRC's sub-miniature (SM) type precision power resistors offer the widest range of Ohmic values anywhere. You can select any Ohmic value or decimal part of an Ohm from .02Ω to 4MΩ (MegaOhm or MEG)
- CUSTOM TOLERANCES
- ±1% (Std) Also available: ±.5%, ±.25%, ±.1%, ±.05%
- TCR CHARACTERISTICS
- Standard:
- For 100Ω & Above: 0±10ppm/°C.
- For values below 100Ω: 0±15ppm/°C.
- Special:
- To 0±2ppm/°C.
- *Please specify temperature span of operation.
- INDUCTANCE
- All standard SM series resistors are inductively wound. Non-inductive windings are available upon request, simply add suffix letter "N" to the part name when ordering.
- TERMINALS
- Solderable hot tinned pure copper leads are standard at PRC.
- PROTECTIVE SEAL
- SM type resistors are coated in a tough solvent resistant high temperature silicone formulation with indelible marking.
- PRECISION POWER RATINGS
- All standard ±1% tolerance type SM resistors are designed for continuous full load operation at +25°C Derating to zero wattage at +275°C. Derating is required for any tolerance below 1%. Refer to Derating Table seen here & Figure #5 at the bottom of the page.
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Type SM Derating Table:* |
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For ± 1%
resistance tolerance apply up to 100% of rated power at +25 Degrees Celsius, derated to zero power at +275 Degrees Celsius.
For ± ½% (0.5%)
resistance tolerance apply up to 80% of rated power at +25 Degrees Celsius, derated to zero power at +225 Degrees Celsius.
For ± ¼% (0.25%)
resistance tolerance apply up to 60% of rated power at +25 Degrees Celsius, derated to zero power at +175 Degrees Celsius.
For ± 1/10% (0.1%)
resistance tolerance apply up to 40% of rated power at +25 Degrees Celsius. derated to zero power at +125 Degrees Celsius.
For ± 1/20% (0.05%)
resistance tolerance apply up to 20% of rated power at +25 Degrees Celsius, derated to zero power at +75 Degrees Celsius. |
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* Percent of Rated Power vs. Combined Temp. of Self-Heating and Ambient (in °C.).
- DC (PEAK) VOLTAGE RATING
- The secret to our vast success with the SM series is we have implemented high operating voltage winding patterns into our unique design, aided by over 75 years of experience in design & manufacturing. This is done to eliminate dangerous crossovers & potential problems that are usually associated with standard style bobbins & mandrel designs. To calculate the safe operating voltage for resistance values below the maximum we have listed, you must utilize Ohm's Law by applying the formula displayed below the ordering procedure.
CAN'T FIND THE PART TO MATCH YOUR SPECS?
Then let PRC custom manufacture your wire wound resistor, sensor, or shunt with some of the shortest lead times in the industry. Engineering samples can be supplied at no cost to you in 7-10 days for most jobs. Computer tracking charts are available for reference with certain part types. If you need a specific marking on your part(s) we will custom print your order with the marking you desire & at no additional cost to you. If needed, you can interchange the size, shape, lead dimension, wattage, voltage, current, Ω value, tolerance, & TCR characteristics with most part types. Visit our SM 2-Terminal Series & see if one of our other parts from the same series will satisfy all your requirements. If you still do not find a part that meets the exact specifications your application requires, simply follow the link Contact/Request For Quote & fill in all known spec fields. One of our highly trained engineers will review your objectives and see if we can modify one of our standard parts to satisfy all your requirements. If you are unsure how to accurately complete this form, give us a call & someone from our sales department will be more than happy to assist you.
ORDERING PROCEDURE
Our sales department is available to provide price, delivery, lead time & all other pertinent ordering instructions to companies within the U.S.A. If you wish to place an order in the United States, simply give us a call & ask for the Sales Department, our contact information is at the very top of every page. For companies outside the U.S.A., we have sales representatives in over 30 different countries to assist you. Click the link International Sales Representative Map to locate the sales representative nearest to your region & view their contact information. Our international sales representatives are readily available & eager to answer all inquiries regarding pricing, lead time, & ordering instructions as well as any other questions you may have. Our site also features a Virtual Store stocked with many popular sizes from our HR axial lead series and our world renown LVS3 surface mounted shunt. Our unique PRC100 series that tracks like platinum at a fraction of the cost can also be found inside. In addition to these items there are several different designs from our most sought after part types in our premium wire wound product line inside, all waiting to be shipped today to meet your critical deadlines. Small quantities up to twenty-five pieces of each product type with selected Ohmic values & tolerances available. Once inside the virtual store you can instantly purchase parts using your Visa or MasterCard & choose from 4 levels of shipping services, including next day delivery, all delivered by UPS. Feel free to browse through our store anytime day or night & check out what's in stock from the comfort & privacy of your own computer. The store is open 24 hours a day for your convenience.
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