Nemco-electronics Performance Info User Manual download pdf

General Performance Information

Introduction

Tantalum capacitors are manufactured from a powder of pure tantalum metal. The powder is compressed under high

pressure around a tantalum wire to form a ‘pellet’. The riser wire is the anode connection to the capacitor. This is subsequently

vacuum sintered at high temperature (typically 1500 - 2000°C). This helps to drive off any impurities within the powder by

migration to the surface. During sintering the powder becomes a sponge like structure with all the particles interconnected in a

huge lattice. This structure is of high mechanical strength and density, but is also highly porous giving a large internal surface area.

The larger the surface area the larger the capacitance. By choosing the powder used to produce each capacitance/voltage

rating, the surface area can be controlled. The next stage is the production of the cathode plate. This is achieved by pyrolysis of

manganese nitrate into manganese dioxide. The ‘pellet’ is dipped into an aqueous solution of nitrate and then baked in an oven

at approximately 250°C to produce a dioxide coat. This process is repeated several times, varying specific densities of nitrate to

build up a thick coat over all internal and external surfaces of the ‘pellet’. The ‘pellet’ is then dipped into graphite and silver to

provide a good connection to the manganese dioxide cathode plate. Electrical contact is established by deposition of carbon onto

the surface of the cathode. The carbon is then coated with a conductive material to facilitate connection to the cathode

termination. Packaging is carried out to meet specifications and customer requirements.

Specifications

Data relates to an ambient temperature of +25° C

z Operating temperature range -55°C to +125°C

PCT, LSR, MCT and TB -

2/3 x Vr (linear derating) required for operation above +85°C.

CGT (Consumer grade) - (linear derating) +40°C to 0.5 x Vr at +85°C and 0.2 x Vr at +125°C.

z Capacitance Nominal rated capacitance is measured at +25°C, 120 Hz source, free of harmonics with a maximum bias of

2.2V d.c. Capacitance decreases with increasing frequency and increases with increasing temperature.

Typical Component Typical Component

Capacitance vs. Temperature Capacitance vs. Frequency

Temperature °C Frequency

z Capacitance tolerances E.I.A. standard ±20% and ±10%.

Tolerance is the permissable variation of the actual value of capacitance from the rated value.

z Stability ΔC ≤ 12% over the operating temperature range

z Environmental Classification 55/125/56 (IEC 68-2)

Capacitance %

% Capacitance Change

1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - Specifications

General Performance InformationIntroductionTantalum capacitors are manufactured from a powder of pure tantalum metal. The powder is compressed under

Page 2

Surface Mountz Life test Capacitors are subjected to +85°C at ratedvoltage and +125°C at 2/3 x rated voltage for 2000 hourswith 3 ohms circuit impeda

Page 3 - Leakage Current Ratio I/IV

General Performance InformationRadial Dippedz Life test Our regular quality assurance program requirescapacitors be subjected to +85°C at rated volta

Page 4

General Performance Informationz Mechanical propertiesTantalum chip capacitors are mechanically robust, meeting requirements for high speed insertion

Page 5

General Performance Informationz Working DC voltage range - 4 to 50 WVDCRated voltages are the maximum recommended peak DC operatingvoltages for conti

Page 6

General Performance Informationz Reverse voltage A small degree of reverse voltage is permissible for short periods. Limiting reverse voltage excursi

Page 7

General Performance Informationz Tan δ(at 120 Hz/25°C) (DF)Tangent of Loss Angle is a measurement of the energy loss in the capacitor. Terms also us

Page 8 - General Technical Information

General Performance Informationz Frequency Dependence ofImpedance and ESRESR and impedance decrease with increasingfrequency. At lower frequencies t

Page 9

General Performance Informationz AC Operation Ripple ratings for all devices can be calculated with the power dissipation rating and ESR rating of the

Page 10 - Surface Mount

General Performance InformationSurface Mount Tantalums Dipped RadialCase CaseTemperature Derating Factors Temperature Derating FactorsSize for power d

Page 11 - Radial Dipped

General Technical Informationz Reliability Tantalum capacitors have no known wear-out mechanism and in certain circumstances are capable ofself-healin

Page 12

General Performance Informationz Operating Voltage/Voltage Derating If a capacitor with a highervoltage rating than the maximum line voltage is used,

Comments to this Manuals

No comments

Nemco-electronics Performance Info User Manual

Browse online or download User Manual for Equipment Nemco-electronics Performance Info. Nemco Electronics Performance Info User Manual

Summary of Contents

Comments to this Manuals

Related products and manuals for Equipment Nemco-electronics Performance Info