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 4-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 click 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 & our sales department will be happy to assist you.
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Electrical & Physical Specifications:
.028" dia. X 1.400" long (min.)
Min Res. @ Max Power:
.028Ω @ 4W
Min Res. @ Derated Power:
.001Ω @ .14W
-55°C to +275°C
SM-4 Series Engineering Attributes:
RESISTANCE & TOLERANCE
Standard: Any Ohmic value or decimal part of an Ohm desired from .015Ω to 100Ω with tolerances to ±.005%
Special: From .001Ω to .015Ω with tolerances to ±.1%
Refer to Fig. 6 for min. resistance vs. tolerance ratios.
Standard: 0±15 PPM/°C.
Special: 0±10 PPM/°C.
Please specify temperature span of operation.
STABILITY VS. TIME
To ±.001%/year @ +25°C. (No Load)
PROTECTIVE COATING SEAL
Solvent resistant coat with indelible marking
The standard minimum resistance at full power is based upon ±1% resistance tolerance @ +25°C. Derating is required for lower values, closer tolerances, and higher temperatures. Please refer to the Derating Table shown here & Fig. 5 below.
*Type SM-4 Derating Table:
For ±1% Res. tol. apply up to 100% of rated power at +25°C. derated to zero at +275°C. For ±0.5% Res. tol. apply up to 80% of rated power at +25°C. derated to zero at +225°C For ±0.25% Res. tol. apply up to 60% of rated power at +25°C.derated to zero at +175°C. For ±0.1% Res. tol. apply up to 40% of rated power at +25°C. derated to zero at +125°C. For ±0.05% Res. tol. apply up to 20% of rated power at +25°C. derated to zero at +75°C.