Type SCR, Commutating Capacitors Type SCRN Film-Paper/Extended Foil Commutating Capacitor Type SCRN capacitors are for SCR (silicon controlled rectifier) commutating applications that require high peak and rms current capability. These capacitors are ideal for other high frequency and pulsed applications. The SCRN is supplied in oval or rectangular metal cases with 1/4 x 20 threaded stud and insulated terminals to withstand high current and high peak voltages. Highlights - Conforms to EIA RS401 for power semiconductor applications - Non ferrous covers available for high frequency applications - 40,000 hours life at full rated voltage and temperature - High voltage, high current and high frequency - Custom designs available Specifications Capacitance Range 0.25 µF to 50.0 µF Capacitance Tolerance ±10% Rated Voltage 200 Vpk to 2000 Vpk Operating Temperature Range –40 ºC to +80 ºC Maximum rms Current Case codes: A, B, C, D = 60 Irms max. E and F = 100 Irms max. Maximum rms Voltage see application guide Test Voltage between Terminal @ 25ºC DC voltage 2 x rated peak for 60 s Test Voltage between Terminals & Case @ 25ºC 2 x reference AC voltage +1000 Vac for 60 s Life Test EIA RS401 Life Expectancy 40,000 h life at full rated voltage, current, case temperature and VA Reliability Minimum of 95% survival Standards EIA RS401 Rohs Compliant Dimensions Construction Details B ±0.03" B ±0.06” ±0.03" A ±0.06” ±0.03" Case Material Tin Plated Steel or Aluminum Encapsulation Biodegradeable, Environmentally Compatible Fluid Terminal Material Electro-tin plated copper stud and molded pillar insulator A ±0.03" F ±0.03" F ±0.03" ¼ - 20 THD 2 places C ±0.06" D ±0.06" ¼ - 20 THD 2 places C ±0.06" D ±0.06" Case H +0.12” ±0.06" -0.06” Code H ±0.06" Figure 1 Figure 2 Dimensions Inches A B C D F H Figure A 1.31 2.16 0.56 1.19 0.81 see table Fig. 1 B 1.56 2.69 0.50 1.13 1.25 see table Fig. 1 C 1.91 2.91 0.50 1.13 1.38 see table Fig. 1 D 1.97 3.66 0.50 1.13 1.38 see table Fig. 1 E 2.84 4.56 0.50 1.13 2.00 see table Fig. 2 F 3.75 4.56 0.56 1.19 2.00 see table Fig. 2 CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830 Type SCR, Commutating Capacitors Type SCRN Film-Paper/Extended Foil Commutating Capacitor Ratings Cap Catalog (µF) Part Number Case H Code (Inches) Max VA Max (65 ºC) (Arms) Cap Catalog (µF) Part Number 200 Vpk (Paper Dielectric) Case H Code (Inches) Max VA Max (65 ºC) (Arms) 600 Vpk (Film Dielectric for Low-loss) 3 SCRN201R-F A 2.13 400 60 1 SCRN262R-F A 2.38 2200 60 5 SCRN202R-F A 2.63 465 60 2 SCRN263R-F A 2.38 2060 60 10 SCRN203R-F A 3.88 625 60 3 SCRN264R-F A 3.88 3190 60 15 SCRN205R-F A 4.75 765 60 5 SCRN265R-F A 4.25 4380 60 20 SCRN206R-F B 4.25 875 60 10 SCRN266R-F C 4.25 6060 60 30 SCRN208R-F C 5.25 1200 60 40 SCRN209R-F C 6.75 1500 60 1 SCRN233R-F A 2.13 790 60 50 SCRN210R-F D 5.75 1590 60 2 SCRN234R-F A 3.13 1070 60 3 SCRN235R-F A 3.88 1455 60 2 SCRN211R-F A 2.63 60 5 SCRN236R-F B 4.25 1785 60 3 SCRN212R-F A 2.63 970 60 10 SCRN237R-F C 5.75 2570 60 5 SCRN213R-F A 3.88 1130 60 15 SCRN238R-F D 5.75 3170 60 10 SCRN214R-F B 4.75 1930 60 20 SCRN239R-F E 5.13 5200 100 15 SCRN215R-F C 4.75 2240 60 20 SCRN216R-F C 6.25 2800 60 .5 SCRN240R-F A 400 Vpk (Film and Paper Dielectric) 790 1000 Vpk (Film and Paper Dielectric) 1500 Vpk (Film and Paper Dielectric) 2.13 990 60 30 SCRN217R-F D 6.75 3720 60 1 SCRN241R-F A 2.88 1240 60 40 SCRN218R-F D 8.00 4330 60 2 SCRN242R-F B 3.50 1890 60 50 SCRN219R-F E 6.25 6050 100 3 SCRN243R-F C 4.25 2550 60 5 SCRN244R-F C 5.75 3250 60 2 SCRN220R-F A 2.63 815 60 10 SCRN245R-F E 5.13 6500 100 3 SCRN221R-F A 3.13 1200 60 5 SCRN222R-F A 4.25 1420 60 .25 SCRN246R-F A 2.13 990 60 10 SCRN224R-F C 4.25 2040 60 .33 SCRN257R-F A 2.13 1000 60 600 Vpk (Film and Paper Dielectric) 2000 Vpk (Film and Paper Dielectric) 15 SCRN226R-F C 5.75 2800 60 .5 SCRN247R-F A 2.63 1180 60 20 SCRN227R-F D 5.75 3260 60 1 SCRN248R-F A 3.13 1300 60 25 SCRN229R-F D 6.75 3720 60 2 SCRN249R-F B 4.25 2230 60 30 SCRN230R-F D 8.00 4330 60 3 SCRN251R-F C 4.75 2800 60 40 SCRN231R-F E 6.25 6060 100 5 SCRN253R-F D 5.75 4020 60 50 SCRN232R-F E 7.25 6850 100 10 SCRN256R-F F 5.75 7600 100 CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830 Type SCR, Commutating Capacitors Type SCRN Film-Paper/Extended Foil Commutating Capacitor Application Guide How to Choose a Commutating Capacitor 1. From circuit analysis or measurement, determine application values for these six parameters: Nominal capacitance in µF Current pulse width in µs Current pulse period in µs Maximum peak voltage Continuous AC voltage in Vrms Maximum volt-amps (VA) 2. Choose a capacitor from the ratings table of the desired nominal capacitance with a peak voltage rating no less than your maximum peak voltage. Using Volt-Ampere Ratings The capacitors maximum VA rating is the maximum product of the sine wave voltage and current that may be applied at 65 ºC without overheating the capacitor and reducing its expected life. For other temperatures and pulsed current, use the multipliers of Figures 2 and 3 to derate the Max VA rating. 3. Check that your application’s rms current is no more than the capacitor’s Max. Amps RMS. You can calculate the current from your Vrms using the equations in the following section. 4. Check that your application’s volt-amperes is not more than the capacitor’s VA capability. The VA capability is the max VA rating times the Volt-Ampere multiplier from Figure 2 (Current Pulse Width) and that times the Volt-Ampere Multiplier from Figure 3 (Ambient Temperature). See the following section for more on using volt-ampere multipliers. If you need a greater VA capability, repeat these steps for a higher peak voltage capacitor or consider connecting units in parallel to divide the VA required. For up to peak voltage of 600 V, you may also consider polypropylene film dielectric units, Catalog Numbers SCRN262R through SCRN266R, with higher VA capability. Pulse Wave Applications V peak Voltage ΔV T The Max Amps RMS rating is set by the capability of the capacitor terminals. Exceeding this limit can damage the terminals and cause capacitor failure. Calculate the capacitor’s actual VA load as the product of the rms voltage across the capacitor and the rms current through the capacitor. To calculate rms current for an applied sine wave or squarewave voltage, use these equations. Current I peak Figure 1 For a sinewave voltage the current is: Irms = 2π fCVrmsX10-6 and for a squarewave the current is: Irms = C∆V/[0.64(tT)0.5] = Ipeak(t/T)0.5 where (f ) is repetition frequency in Hz, C is nominal capacitance in µF, ∆V the peak-to-peak squarewave amplitude in volts, (t) is the pulse width in µs and T is the pulse period in µs. The peak current for the square wave voltage is: Ipeak = C∆V/0.64t CDE Cornell Dubilier • 1605 E. 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