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307C1252 Datasheet(PDF) 1 Page - Vishay Siliconix |
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307C1252 Datasheet(HTML) 1 Page - Vishay Siliconix |
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1 / 1 page Document Number: 23088 Revision 14-May-02 www.vishay.com 10 307C Lighting Thermistors Vishay Cera-Mite ceramite.support@vishay.com FEATURES • Electrode preheat thermistors for use in compact fluorescent lamps (CFL) and electronic ballasts. • Current limiting, time-delayed start-up extends lamp life. • Quiet, flicker-free operation. • Developed in cooperation with leading ballast designers. • Both standard and custom parts are available. • Economical, reliable and proven in millions of lamps throughout the world. APPLICATION CONSIDERATIONS • Ignition time can be optimized to increase life of lamp. • PTC resistance (R25) is chosen, along with filament resistance and application voltage, to control desired electrode preheat current. • Lamp preheat time is determined by time required for thermistor to switch from low to high resistance state. Preheat currents shown result in switch times of approximately 1 second at 25 °C. Lower currents result in longer switch times. FLUORESCENT LAMP C PTC RESISTANCE INSTANTANEOUS CONTINUOUS PREHEAT D R25 VOLTAGE VOLTAGE CURRENT MAX. PART (OHMS) (VRMS)(VRMS) (mA) (mm) NUMBER 150 265 80 215 4.5 307C1407 150 280 200 200 4.5 307C1414 50 175 50 430 5.5 307C1230 70 265 150 350 5.5 307C1654 100 260 95 370 5.5 307C1364 125 230 80 280 5.5 307C1259 150 235 90 260 5.5 307C1253 200 320 145 300 5.5 307C1223 240 350 150 260 5.5 307C1171 300 400 165 225 5.5 307C1225 380 410 170 205 5.5 307C1390 600 420 120 185 5.5 307C1252 600 460 200 170 5.5 307C1224 850 450 340 140 5.5 307C1622 100 340 265 390 7 307C1403 150 340 150 400 7 307C1306 180 350 165 380 7 307C1569 200 355 265 300 7 307C1375 300 370 75 270 7 307C1242 300 420 320 230 7 307C1360 500 480 400 190 7 307C1361 800 530 450 155 7 307C1362 850 520 175 190 7 307C1260 70 210 50 750 8.5 307C1367 70 300 140 725 8.5 307C1366 85 210 50 670 8.5 307C1363 150 400 100 550 8.5 307C1287 85 280 60 820 10 307C1258 100 310 90 750 10 307C1365 400 430 120 420 10 307C1422 PTC THERMISTORS FOR ELECTRONIC FLUORESCENT BALLASTS 5mm max Tinned Copper Clad Steel Wire 24 AWG when D ≤ 8.5mm 22 AWG when D ≥ 10mm Note 1: R25 - Nominal zero power resistance ± 25% at 25°C. For given diameter, higher resistance thermistors offer higher maximum voltages. Note 2: Instantaneous Voltage - Maximum rms voltage permitted across thermistor during fluorescent lamp start-up cycle. Note 3: Continuous Voltage - Maximum rms voltage continuously applied across thermistor during normal lamp operation. Note 4: Preheat Current - rms current (60Hz) which switches thermistor to high resistance in approximately 1 second at 25 °C ambient. Note 5: Size (mass) of PTC influences rate of I 2R temperature increase. For given resistance, larger thermistors have longer switch times. Optional coating slightly increases switch time. Note 6: P/N suffix (not shown) describes wire lead forms and other options. 32mm min 4.5mm max. LS = 5mm D Options: • High Temperature Coating • Short Clipped Leads • Other Wire Forms and Lead Spacings 12 3 4 5 6 PTC Thermistors For Electronic Fluorescent Ballasts |
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