SCRN253R-F

**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 

## **Specifications** 

- High voltage, high current and high frequency 

- Custom designs available 

|**Capacitance Range**|**Capacitance Range**|**Capacitance Range**|**Capacitance Range**||||||||||||||||||0.25 µF to 50.0 µF|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.||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||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||||
||||||||||||||||||**Regulatory Information**||||||||
|**Dimensions**<br>**Construction Details**<br>Case Material<br>Tin Plated Steel or Aluminum<br>Encapsulation<br>Biodegradeable, Environmentally<br>Compatible Fluid<br>Terminal Material<br>Electro-tin plated copper stud and<br>moldedpillar insulator<br>**Case**<br>**Dimensions Inches**<br>**Code**<br>**A**<br>**B**<br>**C**<br>**D**<br>**F**<br>**H**<br>**Figure**<br>**A**<br>1.31 2.16<br>0.56<br>1.19<br>0.81<br>see table<br>Fig. 1<br>**B**<br>1.56 2.69<br>0.50<br>1.13<br>1.25<br>see table<br>Fig. 1<br>**C**<br>1.91 2.91<br>0.50<br>1.13<br>1.38<br>see table<br>Fig. 1<br>**D**<br>1.97 3.66<br>0.50<br>1.13<br>1.38<br>see table<br>Fig. 1<br>A<br>±0.03"<br>B<br>±0.03"<br>F<br>±0.03"<br>B<br>±0.03"<br>A<br>±0.03"<br>F<br>±0.03"<br>D<br>±0.06"<br>C<br>±0.06"<br>H<br>±0.06"<br>¼ - 20 THD<br>2 places<br>H<br>±0.06"<br>D<br>±0.06"<br>C<br>±0.06"<br>¼ - 20 THD<br>2 places<br>±0.06”<br>±0.06”<br>+0.12”<br>-0.06”~~=~~ ~~=—~~<br>:|||||||||||||||||||||||||
|||||||||||||||||||||||**E**<br>2.84 4.56|0.50<br>1.13<br>2.00<br>see table|Fig. 2|
|**Figure 1                                             Figure 2**|||**Figure 1                                             Figure 2**|**Figure 1                                             Figure 2**|**Figure 1                                             Figure 2**|**Figure 1                                             Figure 2**|**Figure 1                                             Figure 2**|**Figure 1                                             Figure 2**|**Figure 1                                             Figure 2**|**Figure 1                                             Figure 2**|**Figure 1                                             Figure 2**|**Figure 1                                             Figure 2**|||||**Figure 1                                             Figure 2**|||||**F**<br>3.75 4.56|0.56<br>1.19<br>2.00<br>see table|Fig. 2|
||||||||||||||||||||||||||
|**CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830**|||||||||||||||||**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**<br>**Catalog**<br>**Case**<br>**H**<br>**Max VA**<br>**Max**<br>**(µF)**<br>**Part Number**<br>**Code**<br>**(Inches)**<br>**(65 ºC)**<br>**(Arms)**||**Cap**<br>**Catalog**<br>**Case**<br>**H**<br>**Max VA**<br>**Max**<br>**(µF)**<br>**Part Number**<br>**Code**<br>**(Inches)**<br>**(65 ºC)**<br>**(Arms)**|
|**200 Vpk (Paper Dielectric)**||**600 Vpk (Film Dielectric for Low-loss)**|
|3<br>SCRN201R-F<br>A<br>2.13<br>400<br>60<br>5<br>SCRN202R-F<br>A<br>2.63<br>465<br>60<br>10<br>SCRN203R-F<br>A<br>3.88<br>625<br>60||1<br>SCRN262R-F<br>A<br>2.38<br>2200<br>60<br>2<br>SCRN263R-F<br>A<br>2.38<br>2060<br>60<br>3<br>SCRN264R-F<br>A<br>3.88<br>3190<br>60|
|15<br>SCRN205R-F<br>A<br>4.75<br>765<br>60<br>20<br>SCRN206R-F<br>B<br>4.25<br>875<br>60<br>30<br>SCRN208R-F<br>C<br>5.25<br>1200<br>60||5<br>SCRN265R-F<br>A<br>4.25<br>4380<br>60<br>10<br>SCRN266R-F<br>C<br>4.25<br>6060<br>60|
|||**1000 Vpk (Film and Paper Dielectric)**|
|40<br>SCRN209R-F<br>C<br>6.75<br>1500<br>60<br>50<br>SCRN210R-F<br>D<br>5.75<br>1590<br>60||1<br>SCRN233R-F<br>A<br>2.13<br>790<br>60<br>2<br>SCRN234R-F<br>A<br>3.13<br>1070<br>60<br>3<br>SCRN235R-F<br>A<br>3.88<br>1455<br>60|
|**400 Vpk (Film and Paper Dielectric)**|||
|2<br>SCRN211R-F<br>A<br>2.63<br>790<br>60<br>3<br>SCRN212R-F<br>A<br>2.63<br>970<br>60<br>5<br>SCRN213R-F<br>A<br>3.88<br>1130<br>60||5<br>SCRN236R-F<br>B<br>4.25<br>1785<br>60<br>10<br>SCRN237R-F<br>C<br>5.75<br>2570<br>60<br>15<br>SCRN238R-F<br>D<br>5.75<br>3170<br>60|
|10<br>SCRN214R-F<br>B<br>4.75<br>1930<br>60<br>15<br>SCRN215R-F<br>C<br>4.75<br>2240<br>60<br>20<br>SCRN216R-F<br>C<br>6.25<br>2800<br>60||20<br>SCRN239R-F<br>E<br>5.13<br>5200<br>100|
|||**1500 Vpk (Film and Paper Dielectric)**|
|||.5<br>SCRN240R-F<br>A<br>2.13<br>990<br>60<br>1<br>SCRN241R-F<br>A<br>2.88<br>1240<br>60<br>2<br>SCRN242R-F<br>B<br>3.50<br>1890<br>60|
|30<br>SCRN217R-F<br>D<br>6.75<br>3720<br>60<br>40<br>SCRN218R-F<br>D<br>8.00<br>4330<br>60<br>50<br>SCRN219R-F<br>E<br>6.25<br>6050<br>100|||
|||3<br>SCRN243R-F<br>C<br>4.25<br>2550<br>60<br>5<br>SCRN244R-F<br>C<br>5.75<br>3250<br>60<br>10<br>SCRN245R-F<br>E<br>5.13<br>6500<br>100|
|**600 Vpk (Film and Paper Dielectric)**|||
|2<br>SCRN220R-F<br>A<br>2.63<br>815<br>60<br>3<br>SCRN221R-F<br>A<br>3.13<br>1200<br>60<br>5<br>SCRN222R-F<br>A<br>4.25<br>1420<br>60|||
|||**2000 Vpk (Film and Paper Dielectric)**|
|||.25<br>SCRN246R-F<br>A<br>2.13<br>990<br>60<br>.33<br>SCRN257R-F<br>A<br>2.13<br>1000<br>60<br>.5<br>SCRN247R-F<br>A<br>2.63<br>1180<br>60|
|10<br>SCRN224R-F<br>C<br>4.25<br>2040<br>60<br>15<br>SCRN226R-F<br>C<br>5.75<br>2800<br>60<br>20<br>SCRN227R-F<br>D<br>5.75<br>3260<br>60|||
|||1<br>SCRN248R-F<br>A<br>3.13<br>1300<br>60<br>2<br>SCRN249R-F<br>B<br>4.25<br>2230<br>60<br>3<br>SCRN251R-F<br>C<br>4.75<br>2800<br>60|
|25<br>SCRN229R-F<br>D<br>6.75<br>3720<br>60<br>30<br>SCRN230R-F<br>D<br>8.00<br>4330<br>60<br>40<br>SCRN231R-F<br>E<br>6.25<br>6060<br>100|||
|||5<br>SCRN253R-F<br>D<br>5.75<br>4020<br>60<br>10<br>SCRN256R-F<br>F<br>5.75<br>7600<br>100|
|50<br>SCRN232R-F<br>E<br>7.25<br>6850<br>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. 

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. 

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. 

**==> picture [171 x 186] intentionally omitted <==**

**----- Start of picture text -----**<br>
Pulse Wave Applications<br>||  V peak<br>|<br> Voltage<br>|  ΔV<br>|<br>T<br>f<br> Current<br> I peak<br>Figure 1<br>**----- End of picture text -----**<br>


For a sinewave voltage the current is: 

## **Irms = 2** π **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. Rodney French Blvd. • New Bedford, MA 02744 • Phone: (508)996-8561 • Fax: (508)996-3830** 

**Notice and Disclaimer:** All product drawings, descriptions, specifications, statements, information and data (collectively, the “Information”) in this datasheet or other publication are subject to change. The customer is responsible for checking, confirming and verifying the extent to which the Information contained in this datasheet or other publication is applicable to an order at the time the order is placed. All Information given herein is believed to be accurate and reliable, but it is presented without any guarantee, warranty, representation or responsibility of any kind, expressed or implied. Statements of suitability for certain applications are based on the knowledge that the Cornell Dubilier company providing such statements  (“Cornell Dubilier”) has of  operating conditions that such Cornell Dubilier company regards as typical for such applications, but are not intended to constitute any guarantee, warranty or representation regarding any such matter – and Cornell Dubilier specifically and expressly disclaims any guarantee, warranty or representation concerning the suitability for a specific customer application, use, storage, transportation, or operating environment. The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any technical advice inferred from this Information or otherwise provided by Cornell Dubilier with reference to the use of  any Cornell Dubilier products is given gratis (unless otherwise specified by Cornell Dubilier), and Cornell Dubilier assumes no obligation or liability for the advice given or results obtained.  Although Cornell Dubilier strives to apply  the most stringent quality and safety standards regarding the design and manufacturing of its products, in light of the current state of the art, isolated component failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards (such as installation of protective circuitry or redundancies or other appropriate protective measures) in order to ensure that the failure of an electrical component does not result in a risk of personal injury or property damage. Although all product-related warnings, cautions and notes must be observed, the customer should not assume that all safety measures are indicated in such warnings, cautions and notes, or that other safety measures may not be required.