HPW Series High Precision Welded Axial and Radial F e at u r e S High precision Inherent low temperature coefficient All welded construction Extremely low Thermal Molded thermosetting EMF plastic bobbin Low voltage coefficient Wide ohmic range combined with tight Low noise tolerance Excellent long-term stability SerieS SPeciFicationS cHaracteriSticS Power Rating Minimum Values 0.1 for 1% and 0.5% 10 for 0.1% and tighter Max. 125C Max. Resistance 0.005%, 0.01%, 0.02%, 0.05%, 0.1%, 0.5%, Tolerance and 1%, depending on style and value Type Ohms (Watts) Volts 10ppm/C standard for 10 and above. Higher TCs Temperature 118A 192k 0.05 150 on low ohmic values. TC match to 1ppm/C. High Coefficient (TCR 102A 334k 0.10 150 TCs upto +6000ppm/C are available 101A 410k 0.10 300 60C to +150C Working tempera- 153A 435k 0.10 ture range 103A 633k 0.10 150 All Welded The combination of all welded construction and com- Construction patible materials provide the most reliable means of 105A 820k 0.125 interconnects possible. 184A 820k 0.125 300 Butt Weld of Tab to A tab material of 800 ohm alloy (the same as the 185A* 961k 0.125 300 Terminal resistance wire) is butt welded to the terminal and 202A 968k 0.25 200 molded deep into the resistor bobbin. This design parameter assures the least possible DC transients 203A 1.7 M 0.25 200 due to thermal EMF. 205A* 1.93 M 0.33 400 Bobbin Design The ratio of the height of the Pi wall to the width of 207A* 3.0 M 0.50 800 the Pi and to the diameter of the bobbin mandrel are 308A 3.0 M 0.60 800 critical to the basic stability of a wirewound resistor. These parameters are optimized for each wire size, 210A* 4.10 M 0.50 800 wattage size and range of resistor values. 307A 5.63 M 0.60 Encapsulation Both the bobbin and the final encapsulation material 310A 7.68 M 1.00 800 Material are thermosetting alkyd polyester. The resulting resis- 505A 10 M 1.00 tor is virtually a homogeneous mass with an identical coefficient of expansion which is unaffected by the 510A* 24 M 1.25 800 most violent of temperature cycling. All types are 515A* 35 M 1.50 1200 unaffected by application of solvents. 517A 43 M 1.75 1200 Terminal Materials The standard terminal material is hot solder dipped 520A* 43 M 2.00 1200 copper (C5N). 203PA 1.48 M 0.25 150 305PA 3.3 M 0.50 *Available in hermetically sealed (continued) 124 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.comHPW Series High Precision Welded Axial and Radial dimenSionS (.020 in./ .508 mm) Type Power Rating A B AWG Lead Diam. Axial 118A 0.05 0.130 / 3.30 0.180 / 4.57 26 0.016 / 0.406 102A 0.10 0.110 / 2.79 0.250 / 6.35 24 0.020 / 0.508 1.25 / 31.75mm BA 101A 0.10 0.130 / 3.30 0.375 / 9.53 22 0.026 / 0.660 min. 153A 0.10 0.150 / 3.81 0.245 / 6.22 22 0.026 / 0.660 103A 0.10 0.150 / 3.81 0.300 / 7.62 22 0.026 / 0.660 105A 0.125 0.160 / 4.06 0.500 / 12.70 22 0.026 / 0.660 184A 0.125 0.187 / 4.75 0.375 / 9.53 22 0.026 / 0.660 Round Radial 185A* 0.125 0.187 / 4.75 0.500 / 12.70 22 0.026 / 0.660 202A 0.25 0.250 / 6.35 0.310 / 7.87 22 0.026 / 0.660 203A 0.25 0.250 / 6.35 0.343 / 8.71 20 0.032 / 0.813 C 205A* 0.33 0.250 / 6.35 0.500 / 12.70 20 0.032 / 0.813 207A* 0.50 0.250 / 6.35 0.750 / 19.05 20 0.032 / 0.813 AB 308A 0.60 0.312 / 7.93 0.810 / 20.57 20 0.032 / 0.813 210A* 0.50 0.250 / 6.35 1.00 / 25.40 20 0.032 / 0.813 Model Dim. C 307A 0.60 0.375 / 9.53 0.750 / 19.05 20 0.032 / 0.813 203PA 0.200 / 5.08 310A 1.00 0.375 / 9.53 1.00 / 25.40 20 0.032 / 0.813 305PA 0.200 / 5.08 505A 1.00 0.500 / 12.70 0.500 / 12.70 20 0.032 / 0.813 505PA 0.300 / 7.62 510A* 1.25 0.500 / 12.70 1.00 / 25.40 20 0.032 / 0.813 515A* 1.50 0.500 / 12.70 1.50 / 38.10 20 0.032 / 0.813 517A 1.75 0.500 / 12.70 1.75 / 44.45 20 0.032 / 0.813 520A* 2.00 0.500 / 12.70 2.00 / 50.8 20 0.032 / 0.813 203PA 0.25 0.270 / 6.86 0.320 / 8.13 22 0.026 / 0.660 305PA 0.50 0.375 / 9.53 0.500 / 12.70 20 0.032 / 0.813 *Available in hermetically sealed HoW to order 203A1M700T Format* Tolerance* Type Resistance V= 0.005% A = axial 1R000 = 1 T= 0.01% PA = round radial 10R00 = 10 Q= 0.02% 100R0 = 100 *All formats and A= 0.05% 1K000 = 1000 tolerances not B= 0.1% 10K00 = 10 K available in all C = 0.25% 100K0 = 100 K values D = 0.5% 1M700 = 1.7 M F= 1.0% 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com 125