FEATURES * 20 Watt Power Rating at 25C Case Temperature * High Pulse Tolerant Design * Quick-snap Molded Package * Very Low Inductance Design * Resistor Package Electrically Isolated from Heat Sink * Low Thermal Resistance to Heat Sink @ RTH<6.25C/W * Tube Packaging Available APPLICATIONS * Frequency Conversion * High Frequency Balancing * Snubbers Ohmite's new TCH35 TO220 package resistor provides 35W of steady state power when properly used in today's well defined heat sink applications. These very low induction resistors are built under proprietary processes that deliver 75% more power handling capability than other TO220 package resistors of similar size. Standard lead forms are provided for manual or automatic insertion. A single screw mounting tab connects to the heat sink and should be accompanied by the use of a thermal compound. The TCH35 Series offers a low thermal resistance to the heat sink of <4.28C/W. FEATURES * 35W Power Rating @ 25C * Very Low Inductance Design * Single Screw Mounting * Low Thermal Resistance to Heat Sink @ RTH<4.28C/W * Resistance Element is Electrically Insulated from Metal Heat Sink Mounting Tab APPLICATIONS * Switching Power Supplies * Snubbers * High Frequency * Voltage Regulation * Low Energy Pulse Loading Ohmite Mfg. Co. TAH20 Series SPECIFICATIONS Electrical Resistance Range: 0.05 to 10K, other values available upon request Tolerance: 5% std. 1% Available on request Temperature Coefficient: Referenced to 25C, R taken at +105C; 1 to 10: (100ppm+0.002)/C 10 & up: 50ppm/C Max Operating Voltage: 350V Dielectric Strength: 1,800 VAC Power Rating: 20W @ 25C case temperature; see derating curve, next page Insulation Resistance: 10G min. Momentary Overload: 2x rated power for 5 seconds where applied voltage 1.5 times max. operating voltage. R (0.3% + 0.001) max. Terminal Material: Copper Terminal Plating: Lead Free Solder (97% Tin, 3% Silver) Mounting: Requires the use of a snap-on style heat sink. A thermal compound should be properly applied. Solder Process: The TAH20 cannot exceed 260C for more than 10 seconds during soldering process. 20 Watt TO220 Style Thick Film Power Resistors RoHS Compliant 0.400-0.420" (10.15-10.67mm) 0.115-0.135" (2.92-3.44mm) 0.630-0.650" (16.00-16.52mm) 0.450-0.550" (11.43-13.97mm) 0.100-0.160" (2.54-4.06mm) 0.045-0.055" (1.14-1.40mm) 0.016-0.024" (0.40-0.60mm) 0.026-0.034" (0.66-0.86mm) 0.190-0.210" (4.82-5.34mm) 0.060-0.080" (1.52-2.04mm) P E R F O R M A N C E D ATA MIL-R-39009, 2000 Hours @ Rated Pwr MIL-R-STD-202, Method 107, Cond. F MIL-R-STD-202, Method 204, Cond. D MIL-R-STD-202, Method 211, Cond. A (Pull Test) 2.4N Moisture Resistance MIL-R-STD-202, Method 106 Load Life Thermal Shock High Freq Vibration Terminal Strength R = (1.0% + 0.001) R = (0.3% + 0.001) max R = (0.2% + 0.001) max R = (0.2% + 0.001) max R = (0.5% + 0.01) max (continued on next page) TCH35 Series SPECIFICATIONS Electrical Resistance Range: 0.1 to 10K (higher values on request subject to derating) Resistance Tolerance: 5% standard 1% available on request Temperature Coefficient: Referenced to 25C, 0.390-0.410" 0.047-0.055" R taken at +105C (9.91-10.41mm) (1.20-1.40mm) 10 and above: 50 ppmC 0.112-0.120" 1 to10: (2.85-3.05mm) (100ppm +0.002)/C 0.230-0.250" Max. Operating Voltage: 350V (5.85-6.35mm) 0.571-0.591" Dielectric Strength: 1800 VAC (14.50-15.00mm) Insulation Resistance: 10G min. Momentary Overload: 2x rated 0.046-0.054" 0.157" max. 0.159-0.190" power for 5 seconds as long as (1.17-1.37mm) (5.00mm) (4.06-4.82mm) the applied voltage 1.5 times 0.027-0.034" the continuous operating voltage, 0.022-0.028" 0.500-0.579" where R (0.3% + 0.01) max (0.70-0.86mm) (0.55-0.70mm) (12.70-14.70mm) Terminal Material: Copper 0.080-0.089" Terminal Plating: Lead Free (2.05-2.25mm) Solder (97% Tin, 3% Silver) 0.190-0.210" Maximum Torque: 0.9 Nm (4.83-5.33mm) Power Rating: 35 Watts @ 25C case temperature; see derating P E R F O R M A N C E D ATA curve, next page Load Life MIL-R-39009, 2000 Hours @ Rated Pwr R = (1.0% + 0.01) Working Temperature Range: Thermal Shock MIL-R-STD-202, Method 107, Cond. F R = (0.3% + 0.01) max -55C to +175C High Freq Vibration MIL-R-STD-202, Method 204, Cond. D R = (0.2% + 0.01) max Solder Process: The TCH35 canTerminal Strength MIL-R-STD-202, Method 211, Cond. A R = (0.2% + 0.01) max not exceed 260C for more than (Pull Test) 2.4N 10 seconds during soldering Moisture Resistance MIL-R-STD-202, Method 106 R = (0.5% + 0.01) max process. 35 Watt TO220 Style Thick Film Power Resistors RoHS Compliant o0.139-0.148" (3.55-3.75mm) The TAH20 is a completely encapsulated thick film resistor in the TO220 package outline. Rated for 20 watts @ 25C case temperature, these resistors are electrically isolated, and molded in a high temperature case. Designed for heat sink mounting, the symmetrical package is ready for use with snap-on style heat sinks (we recommend use of thermal grease). The TAH20 Series is very low induction, and available in a wide range of resistance values in standard 5% tolerance. 1% tolerance available by special order. (continued on next page) 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 * Tel. 1-866-9-OHMITE * Fax 1-847-574-7522 * www.ohmite.com * info@ohmite.com TAH20/TCH35 Series 20 Watt & 35 Watt TO220 Series Thick Film Power Resistors (continued) D E R AT I N G C U R V E PULSE-FORM E-function, time between two pulses: 1 sec. TAH/TCH 16/28 60 12/21 TCH 40 8/14 TAH 20 4/ 7 0 0 100,000 10,000 TCH35 TAH20 1,000 Energy (Ws) 80 Percent Rated Power 20/35 Rated Power, Watts 100 100 10 1 0.1 0 50 25 75 100 125 Case Temperature, C 150 O R D E R I N G I N F O R M AT I O N Package Code Tolerance F = 1% J = 5% Standard Series TCH35 = 35W TAH20 = 20W Ohm Value Example: 2R40 = 2.4 Ohms 2K40 = 2400 Ohms RoHS Compliant Non-compliant version not recommended for new designs 175 0.01 0.001 0.01 0.1 1 10 Time, ms. 100 1,000 10,000 100,000 S TA N D A R D VA L U E S E24 standard values (+25 & 50), 1% and 5% tolerance 0.10 1.0 10 0.11 1.1 11 0.12 1.2 12 0.13 1.3 13 0.15 1.5 15 0.16 1.6 16 0.18 1.8 18 0.20 2.0 20 0.22 2.2 22 0.24 2.4 24 0.25 2.5 25 0.27 2.7 27 0.30 3.0 30 0.33 3.3 33 0.36 3.6 36 0.39 3.9 39 0.43 4.3 43 0.47 4.7 47 0.050 0.50 5.0 50 0.051 0.51 5.1 51 0.056 0.56 5.6 56 0.062 0.62 6.2 62 0.068 0.68 6.8 68 0.075 0.75 7.5 75 0.082 0.82 8.2 82 0.091 0.91 9.1 91 Consult factory for current stock disposition. 100 110 120 130 150 160 180 200 220 240 250 270 300 330 360 390 430 470 500 510 560 620 680 750 820 910 1,000 1,100 1,200 1,300 1,500 1,600 1,800 2,000 2,200 2,400 2,500 2,700 3,000 3,300 3,600 3,900 4,300 4,700 5,000 5,100 5,600 6,200 6,800 7,500 8,200 9,100 10,000 20,000 Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 * Tel. 1-866-9-OHMITE * Fax 1-847-574-7522 * www.ohmite.com * info@ohmite.com