Type of Mica Capacitor:

A. CAS Miniature monolithic Mica capacitors
B. CAF Copper foil as an stretch out electrode
C. CAH Copper foil as an stretch out electrode ultra high temperature design
D. CAC Mica chip capacitors

 

 

 

 

 

 

 

 

 

 

 

 

General Information

1. Capacitance range and temperature coefficient groups:

Capacitance Range	<10	10~47	51~91	100~300	330~910	≥1000
Capacitance Precision	±0.5PF	±10%（II）	±5%（I）	±5%（I）	±2%（0）	±1%
Temperature Coefficient Groups	B Not determined	B Not determined	C±200X10-6/°C	C±100X10-6/°C	C±100X10-6/°C	C±100X10-6/°C

2. Capacitance range and temperature coefficient groups:

Measurement Condition		1MHz								1KHz
Capacitance Range (PF)		≥10	≥20	≥30	≥39	≥47	≥56	≥68	≥82~1000	>1000
tg δ (x10-4)	military	15	12	11	10.5	10	9.5	8	7.5	10
	national	30	30	30	20	20	20	20	20	10
Capacitance Range (PF)		10<CR<25			25<CR<100					>1000

3. The testing voltage is two times D.C. working voltage in normal conditions.

4. Insulation resistance: Not less 1 x 10¹⁰Ω in normal conditions. After tested in the conditions of plosive limited temperature, damp, or cycling temperature experiments, the insulation resistance is not less than 1x 10⁹Ω.

5.1 Capacitance

The capacitance values as listed in this catalog represent the nominal capacitance value at +25°C. Capacitance is measured at 1MHz for nominal values of 100 pF or less, and at 1KHz for nominal values greater than 1000pF. Temperature coefficient

The typical temperature coefficient curves shown on other pages of this catalog have envelopes indicating the extreme temperature coefficient limits within which 90% of the dipped mica capacitors will fall. When special temperature coefficient limits are required, or when it is desired that the units be separated into temperature coefficient cells, we are prepared to perform a 100% measurement of the temperature coefficient and capacitance drift parameters.

5.2 High Temperature

Insert capacitors having no body coating, can be designed and supplied for operating temperatures in the area of 400°C. Where capacitors will be used in a special application, we are often able to design parts when we are aware of your special requirements.

5.3 Insulation Resistance

Since insulation resistance is a function of both capacitance and temperature, it of necessity is lower with higher capacitance values and higher operating temperatures. However, dipped mica capacitors having higher insulation resistance values than specified in the commercial and military specifications, are available. Following are curves of insulation resistance requirements which are normally employed for special production dipped mica capacitors.

5.4 Dielectric

Cameltek dipped mica capacitors are fabricated from the china finest mica that is available. This particular form exhibits the best characteristics which may be obtained from mica and results in a capacitor with optimum high temperature characteristics.

Mica is a natural inorganic material, an aluminum silicate mineral ,having toughness, elasticity, and adaptability to thin splitting. When these physical attributes are combined with the excellent electrical characteristics of mica its value as a capacitor dielectric can be readily recognized.

5.5 Electrodes

Silvered mica construction permits intimate contact between the electrodes and the dielectric enabling uniform control of capacitance and a great increase in order of stability.

The electrodes are silver which is applied to the mica dielectric by a screening process, and then fired in an oxidizing atmosphere to obtain a permanent bond. This method provides a plate which will always remain in the same relative position with the dielectric.

The silver is applied in the form of a paste. The screening process, which positions the silvered pattern and determines the margins, is also controlled and is accurate to within 0.001’’.

 

Typical Graph

Capacitance value measured at 1 MHZ will be within tolerance. Capacitors will withstand two times the rated voltage for seconds without arcing. The charging current is limited to 50MA insulation resistance will be greater than 100000 meager measured at 100VDC.

For C<80pF and 1000pF please refer to the graph below.

(A) Dissipation factor: Dissipation factor curves are showed below which normally use when lower dissipation factor values are required.

(B) Typical temperature coefficient range for DM15 dipped mica capacitors:

 

Mica Capacitors Part Number System

1. Series

CODE	Description
CAS	Miniature monolithic Mica capacitors
CAF	Copper foil as and stretch out electrode
CAH	Copper foil as an stretch out electrode
CAC	Surface mount Mica chip capacitors

2. Rated Capacitance

CODE	06R8	0010	0101	0102	0103	0104	0105
PF	6.8PF	10PF	100PF	1000PF	10000PF	100000PF	1000000PF
NF	-	-	-	1NF	10NF	100NF	1000NF
µF	-	-	-	0.001µF	0.01µF	0.1µF	1.0µF

3. Tolerance

Tolerance	±1%	±2%	±5%
Symbols	F	G	J

4. Rated Volatage

Voltage	100V	250V	500V	1000V
Symbols	2A	2E	2G	3A

5. Width Or Diameter (mm)

-	0	1	2	3	4	5	6	7	8	9
-	-	1	2.5	3	4	5	6	7.5	8	9
A	10	11	12.5	13	14	15	16	17.5	18	19
B	20	21	22.5	23	24	25	26	27.5	28	29
C	30	31	32.5	33	34	35	36	27.5	38	39

6. Pitch Or Length (mm)

-	0	1	2	3	4	5	6	7	8	9
-	-	1	2.5	3	4	5	6	7.5	8	9
A	10	11	12.5	13	14	15	16	17.5	18	19
B	20	21	22.5	23	24	25	26	27.5	28	29
C	30	31	32.5	33	34	35	36	27.5	38	39

8. Lead Length

Code	T	0	1	2	3	4	5	6	7	8	9
Meaning	Tapping	3.5	3.8±0.3	4±0.5	4.5	5±0.5	5±1	6	7	8	9

Code	A	B	C	D	E	F	G	H	J	K	L
Meaning	10	11	12	13	14	15	16	17	18	19	20

Code	M	N	P	Q	R	S	U	V	W	X	Y
Meaning	21	22	23	24	25	30	35	40	45	50	55

Code	Z
Meaning	>60

back to top