Agilent Technologies 4294A Specifications download pdf (Page 76)

Table 5-1. Capacitor types

Type Application Advantage Disadvantage

Film Blocking, buffering. Wide range of capacitance Medium cost

bypass, coupling. and voltage values

filtering to medium High IR, low D, good Q

frequency Stable

Tuning and timing Low TC

High voltage

Mica Filtering, coupling, and Low dielectric losses and good Low capacitance-to-volume

bypassing at high temperature, frequency, and ratio

frequencies aging characteristics

Resonant circuit, tuning Low AC loss, high frequency

High-voltage circuits High IR

Padding of larger Low cost

capacitors Extensive test data, reliable

Ceramic Bypassing, coupling, and High capacitance-to-volume ratio Poor temperature coefficients

filtering to high Chip style available and time stability

frequency Low D (low k type) Large voltage-dependency and

Low cost suceptible to pressure

(high k type)

Tantalum Blocking, bypassing. High capacitance-to-volume ratio Voltage limitation

electrolytic coupling, and filtering Good temperature coefficients Leakage current

in low–frequency Extensive test data Poor RF characteristics

circuits, timing, color Medium cost

convergence circuits, Failure mode: short

squib firing,

photoflash firing

Aluminum Blocking, bypassing. Highest capacitance-to-volume Affected by chlorinated

electrolytic coupling, and low ratio of electrolytics hydrocarbons

frequency filtering Highest voltage of electrolytics High leakage current

Photoflash Highest capacitance Requires reforming after period

Lowest cost per CV unit for of storage

commercial types Poor RF characteristics

High ripple capability Poor reliability

Short life

5-2

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Agilent Technologies 4294A Specifications Page 76