DM15 View Datasheet(PDF) - Sharma Electro Components,Inc

Part Name

Description

Manufacturer

DM15

MICA CAPACITORS

Sharma Electro Components,Inc 

MICA CAPACITORS

PERFORMANCE CHARACTERISTICS

GENERAL SPECIFICATIONS FOR SAHA MICA CAPACITORS

The SAHA Mica capacitors meet the required commercial specifications and the EIA

requirements. The CMO series capacitors also meet the military specifications MIL-C-5. The

actual specifications and dimensions of the capacitors are mentioned under each series in

the catalog.

CAPACITANCE

The capacitance of mica capacitors is measured at 1 M Hz ±10% for capacitance values up

to 1000 pF and at 1 K Hz ±10% for capacitance values above 1000 pF. The capacitance

value when measured at 25 °C shall be with in the tolerance specified.

DISSIPATION FACTOR

The dissipation factor for mica capacitors are measured at 1MHz for values up to 1000 pF

and at 1 KHz for values above 1000 pF. The values shall remain within the specified values.

The variation pattern of dissipation factor for different values of capacitance are also shown

in the Figure 3.

INSULATION RESISTANCE

The insulation resistance is measured at 50 ±5 V for capacitors with rated voltage of 50 V

DC and at 100 ±10 V for capacitors with higher voltage rating. The insulation resistance thus

measured at 25 °C shall meet the specified limits. The variation of insulation resistance for

different capacitance values at 25 °C is shown in Figure 1. After certain tests listed below

the insulation resistance value changes and these values are plotted in Figure 2. Figure 4

indicates the variation pattern of insulation resistance with capacitance value at different

temperature conditions.

WITHSTANDING VOLTAGE

The mica capacitors are designed to withstand higher voltage than the rated voltage for

limited time. These capacitors shall withstand 200% of the rated voltage for 1 to 5 seconds

when applied with a limiting surge current value of 50 mA.

VIBRATION GRADE

The capacitors shall be subjected to a harmonic motion having an amplitude of 1.5 mm and

the frequency which is varied between the limits of 10 and 55 Hz. The entire frequency

range from 10 to 55 Hz and then back to 10 Hz shall be traversed in approximately 1 minute

and the motion shall be applied for a period of 1hour in each of the three mutually

perpendicular directions. After testing, when the electrical measurements are performed:

1. The insulation resistance shall be more than 30000 M Ohms for capacitance value up to

10000 pF. Please refer to Figure 2 for acceptable variation pattern for Insulation

Resistance for values above 10000 pF.

2. The dissipation factor shall be within the original specified limits. Please also refer to

Figure 3 for variation pattern of dissipation factor with respect to capacitance value.

3. The capacitance change shall not exceed ±1% or ±1 pF whichever is greater.

SOLDERING HEAT RESISTANCE

Both leads of the capacitors shall be immersed in molten solder at a temperature of 270

°C for 3 to 4 seconds. After the test the capacitors shall meet the initial requirements of the

Withstanding voltage and the Capacitance change shall not exceed ± 0.55 or ± 1 pF.

MOISTURE RESISTANCE

Capacitors shall be subjected to a temperature of 40 ±2 °C at 90 to 95 % relative humidity

for 240 ±8 Hours. After the test:

1. The samples shall meet the after test requirement of Insulation resistance values as

furnished in Figure 2.

2. The dissipation factor shall be within 1.5 times the original specified limits. Please also

refer to Figure 3 for variation pattern of dissipation factor with respect to capacitance

value for original limits.

3. The capacitance change shall not exceed ±3% or ±1 pF whichever is greater.

MOISTURE RESISTANCE LOADING

Capacitors shall be subjected to a temperature of 40±2 °C at 90 to 95% relative humidity

with rated voltage for 500 Hours. After the test the samples are maintained at normal

temperature and relative humidity for a period of 4 to 24 hours. When tested after this;

1. The capacitor samples shall be free of cracks, or other mechanical damages and the

marking shall remain legible

2. The samples shall meet the original requirement of the Withstanding voltage

3. The samples shall meet the after test requirement of Insulation resistance as furnished in

Figure 2

4. The dissipation factor shall be within 2 times the original limits

5. The capacitance change shall not exceed ±5% or ±1 pF

FIGURE 1

FIGURE 2

FIGURE 3

FIGURE 4

FIGURE 5

3 SUSCO Engineers & Buyers Guide - Mica Section

Tel: 516-981-6690 Fax: 516-981-6867

Share Link: