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| V3PR Vishay Foil Resistors Bulk Metal(R) Foil Technology Power Plate Resistors HI-OHM Model 300589 is a standard configuration 1 Inch x 1 Inch square plate trimmable to any resistance value between 10 ohms and 5Kohms within 0.005%. See Figure 2. Both Power Plate styles are in an ideal configuration for effective heat sinking and temperature monitoring. Product may not be to scale TYPICAL APPLICATIONS LO-OHM This resistor is ideal for use as a sense resistor in deflection amplifier circuits where low noise and high speed are essential in a high power, high stability application. For example, in a CRT radar sweep display the linearity and repeatability of the center point and the sweep can be kept at optimum as the related current through the sense resistor increases from zero to maximum current corresponding to center, zero, and edge of the display. Other typical applications include; CRT film recorders, flying spot scanners, electron beam integrated circuit mask generation, electron beam recording equipment, electron microscopes, graphics display computers, fire control radar display systems, heads-up display systems and high speed video character display systems. HI-OHM When used as a sense resistor in an airborne fixed gyro navigation control computer, this resistor dissipates low power in normal flight. When the aircraft negotiates a turn, the resistor experiences a surge of power which must be dissipated before the navigation system is again stable. While the plane is taxiing on the ground this resistor may experience as much as a 30 watt surge for 15 seconds and must return to within 0.001% of its initial value within 15 minutes. Custom Product Designs can be tailored to your specific applications while the product is in advanced stage. All specifications are subject to change without notice. THROUGH HOLE These power plate resistors can dissipate up to 25 watts per sq. inch of resistive area when properly heat sinked. They are made of foil on 0.025 Inches thick high alumina and therefore are a near zero volume power resistor. Current straps can be soldered to the copper terminal pads and voltage probes can be added for Kelvin connection. Thermal response time is extremely fast due to the short thermal path through the ceramic to the heat sink. Thus momentary overloads are possible without generating a dangerous internal hot spot. Series V3PR Precision Power Plate Resistors are available in 2 basic configuration styles based on resistance value, trimmability, frequency response and flexibility of design. LO-OHM Family features low resistance values (i.e.: 0.25 ohms to 2 ohms typical), loose resistance tolerances, fast response time, high power capability-- or high stability vs. power based on resistor area. The same substrate can contain both resistors and heaters. See Figure 1. FIGURE 1 - V3PR LO-OHM RESISTORS STANDARD DIMENSIONS in inches 300586 (0.25 ) Resistor Substrate Area L: 1.70 0.05 0.98 sq In H: 1.60 0.025 T: 0.025 L 300338 (0.5 ) Resistor Substrate Area L: 1.70 0.05 0.98 sq In H: 1.60 0.025 T: 0.025 L 300571 (1 ) and 300572 (2 ) Resistor Substrate Area L: 1.12 0.658 sq In H: 1.75 T: 0.025 L 300610 (2 ) Substrate L: 5.00 H: 4.00 T: 0.025 Resistor Area 11.25 sq In L 0.24 0.3 H 0.7 0.4 0.7 0.1 0.7 0.7 0.1 0.7 H 0.05 0.3 0.7 0.4 H 0.05 0.3 0.866 0.4 H 2.8 0.355 0.355 0.1 1.0 0.1 0.24 VISHAY FOIL * FRANCE +33.4.93.37.28.24 FAX: +33.4.93.37.27.31 * GERMANY +49.9287.710 FAX: +49 9287.70435 * ISRAEL +972.3.557.0945 FAX: +972.3.558.9121 * ITALY + 39.2.300.11919 FAX: +39.2.300.11999 * JAPAN +81.42.729.0661 FAX: +81.42.729.3400 * SINGAPORE +65.788.6668 FAX: +65.788.0988 * SWEDEN +46.8.594.70590 FAX: +46.8.594.70581 * UK +44 191 514 8237 FAX: +44 1953 457 722 * USA +1 610 407-4800 FAX: +1 610 640-9081 www.vishay.com 102 Document Number: 63015 Revision 30-Jul-02 V3PR Bulk Metal Foil Technology Power Plate Resistors TABLE 1 - V3PR LO-OHM RESISTORS SPECIFICATIONS Model Resistance Range Resistance Tolerance Temperature Coefficient of Resistance (TCR) 1 Load-Life Stability Shelf-Life Stability Power (Total Plate) Current (Max) Current Noise High Frequency Operation Inductance 4 Capacitance < 2H through 30mHz non-measurable 6 (R) Vishay Foil Resistors 300586 0.25 (2/Plate) 15% 300338 0.5 to 0.5% 300571 1 to 0.25% 300572 2 to 0.25% 300610 2 (4/Plate)5 15% 10ppm/C typical (+ 25C to + 70C); tighter TCR's available 0.03% Max R under full rated power @ + 125C for 2,000 hrs 0.0025% Max R/yr 25 watts 7 Amps/R 25 watts 7 Amps 20 watts 4.5 Amps 20 watts 3.1 Amps >100 watts 3.5 Amps/R THROUGH HOLE < 0.010V(rms)/volt of applied voltage TABLE 2 - V3PR HI-OHM RESISTOR SPECIFICATIONS Model Resistance Range 7 300589 10 to 5K to 0.005%; user trimmable also 1 Resistance Tolerance Temperature Coefficient of Resistance (TCR) Load Life Stability Shelf Life Stability Power6 2ppm/C nominal 0.03% Maximum R 2,000 hrs, full rated power @ + 125C 0.0025% Maximum R/yr Recommendations2 3 watts in free air (0.55 Amps Maximum) 6 watts on aluminum heat sink3 (0.77 Amps Maximum) 10 watts on water cooled copper heat sink (1 Amp Maximum) < 0.010V(rms)/volt of applied voltage 1ns @ 1K typical 0.3H typical non-measurable Current Noise High Frequency Operation Rise/Decay Time Inductance 4 Capacitance NOTES: 1. Because of the variety of applications including types of heat sinks, power applied, temperature range, etc., the effective temperature coefficient of initial prototype units may be measured in actual use. A correction factor can then be applied to the production lots to adjust the TCR and achieve the desired effect in use. 2. For extreme or worst case conditions. 3. Aluminum heat sink dimensions: 1.5 Inches L x 1.5 Inches W x 0.5 Inches T (38.1mm) L x (38.1mm) W x (12.7mm) T 4. A short heavy wire contact is recommended to maintain low-inductance. Example: 16 gage copper wire adds 0.02H/inch. 5. Can be cross-wired for any combination of resistors and/ or heaters utilizing individual 2 ohms resistors on same substrate. 6. Based on approximately 10 watts/sq inch with heat sink to keep total film temperature below +100C. Termination must be capable of carrying the current. 7. Not all values tooled. Consult Applications Engineering for currently available values. VISHAY FOIL * FRANCE +33.4.93.37.28.24 FAX: +33.4.93.37.27.31 * GERMANY +49.9287.710 FAX: +49 9287.70435 * ISRAEL +972.3.557.0945 FAX: +972.3.558.9121 * ITALY + 39.2.300.11919 FAX: +39.2.300.11999 * JAPAN +81.42.729.0661 FAX: +81.42.729.3400 * SINGAPORE +65.788.6668 FAX: +65.788.0988 * SWEDEN +46.8.594.70590 FAX: +46.8.594.70581 * UK +44 191 514 8237 FAX: +44 1953 457 722 * USA +1 610 407-4800 FAX: +1 610 640-9081 Document Number: 63015 Revision 30-Jul-02 www.vishay.com 103 V3PR Vishay Foil Resistors Bulk Metal(R) Foil Technology Power Plate Resistors FIGURE 2 - V3PR HI-OHM RESISTOR DIMENSIONS in inches Model 300589 1.00 0.02 0.14 0.04 Square 0.05 Minimum THROUGH HOLE TABLE 3 - ORDERING INFORMATION Specify Vishay V3PR LO-OHM resistors as follows: Order by 300XXX number. No other information is necessary. Specify Vishay V3PR HI-OHM 300589 power plate resistors as follows: Example: 300589 5K0000 0.1% MODEL NO. RESISTANCE VALUE 1.00 0.02 TOLERANCE Resistance Value, in ohms, is expressed by a series of 6 characters, 5 of which represent significant digits while the 6th is a dual purpose letter that designates both the multiplier and the location of the comma or decimal. RESISTANCE RANGE 10 to < 1K 1K to < 5K LETTER DESIGNATOR R K MULTIPLIER FACTOR x1 x103 EXAMPLE 100R01 = 100.01 15K231 = 15,231 VISHAY FOIL * FRANCE +33.4.93.37.28.24 FAX: +33.4.93.37.27.31 * GERMANY +49.9287.710 FAX: +49 9287.70435 * ISRAEL +972.3.557.0945 FAX: +972.3.558.9121 * ITALY + 39.2.300.11919 FAX: +39.2.300.11999 * JAPAN +81.42.729.0661 FAX: +81.42.729.3400 * SINGAPORE +65.788.6668 FAX: +65.788.0988 * SWEDEN +46.8.594.70590 FAX: +46.8.594.70581 * UK +44 191 514 8237 FAX: +44 1953 457 722 * USA +1 610 407-4800 FAX: +1 610 640-9081 www.vishay.com 104 Document Number: 63015 Revision 30-Jul-02 |
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