DCT4E685X0075AF datasheet, PDF

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DCT4E685X0075AF: DescriptionTantalum Capacitor, Polarized, Tantalum (wet), 75V, 20% +Tol, 20% -Tol, 6.8uF, Through Hole Mount, AXIAL LEADED, ROHS COMPLIANT; CategoryPassive components capacitor; File Size3MB，9 Pages; ManufacturerEXXELIA Group; Environmental Compliance

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DCT4E685X0075AF Overview

Tantalum Capacitor, Polarized, Tantalum (wet), 75V, 20% +Tol, 20% -Tol, 6.8uF, Through Hole Mount, AXIAL LEADED, ROHS COMPLIANT

DCT4E685X0075AF Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Objectid	2099132049
package instruction	,
Reach Compliance Code	unknown
capacitance	6.8 µF
Capacitor type	TANTALUM CAPACITOR
dielectric materials	TANTALUM (WET)
leakage current	0.001 mA
Installation features	THROUGH HOLE MOUNT
negative tolerance	20%
Number of terminals	2
Maximum operating temperature	125 °C
Minimum operating temperature	-55 °C
Package shape	TUBULAR PACKAGE
polarity	POLARIZED
positive tolerance	20%
Rated (DC) voltage (URdc)	75 V
ripple current	140 mA
surface mount	NO
Delta tangent	0.04
Terminal shape	WIRE

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GENERAL INFORMATION

MANUFACTURING

ANODE AND INSULATOR

Tantalum capacitors have the highest ratio of capacitance per volume.

This is mainly due to the high dielectric constant of its insulator and to its large

surface area.

The basic raw material is a high purity (greater than 99.99%) tantalum powder

with a very fine granulation, compressed to form a cylinder or a parallelepiped

constituting the anode of the capacitor (positive plate).

The pellet is then sintered at high temperature (1500 to 2000°C), under hard

vacuum (10

-6

torr), firstly to purify the powder and secondly to obtain a strong

mechanical structure by welding of the particles.

The insulating part is obtained by anodization to a depth of the tantalum surface

which forms a tantalum pentoxide film (Ta

) with a thickness of about 16

angstroms per anodization volt. The dielectric constant is between 21 and 27,

depending upon the anodization conditions.

TYPE IDENTIFICATION – ORDERING INFORMATION

THE COMPLETE IDENTIFICATION OF A PRODUCT IS MADE UP OF:

• Type (or model)

• Tolerance

• Testing parameters (standard cata-

log part vs. tested in accordance

with MIL-SPEC standards)

• Rated capacitance

• Rated voltage

• Case size

• RoHS or non-RoHS

• For solid tantalum capacitors

specify tape or bulk packaging

THE TYPE

It identifies the basic capacitor (DCTSXX).

Example: DCTS1

THE RATED CAPACITANCE

Expressed in picofarads, the first two digits are significant figures; the third is the

number of zeros following:

Example: 102 = 10 x 10

pF = 0.001 µF

103 = 10 x 10

pF = 0.01 µF

334 = 33 x 10

pF = 0.33 µF

THE TOLERANCE

It can be expressed directly in % or identified by a code letter:

X0 = ±20% X9 = ±10% X5 = ±5%

Note:

The standard tolerance for tantalum capacitors is ±20%; if no tolerance

is given, it is considered as 20%. A 20% tolerance means in fact -20%

to +20% of the nominal value.

THE RATED VOLTAGE

It is expressed directly in volts (V), with three significant figures.

Example: 006 = 6 V DC; 050 = 50 V DC; 100 = 100 V DC

The case size:

It is indicated on the technical data sheets following the voltage

value and is generally identified by a letter code. It is important to give this

information because there can be, for the same type, a standard range and an

extended range in which the same value will be available in two different sizes.

THE TESTING PARAMETERS

C indicates a standard catalog part and S indicates tested in accordance with

MIL-SPEC standards.

ORDERING INFORMATION EXAMPLE

Part Number = DCTS1105X9040AC

Type: DCTS1

Capacitance = 1 µF

Tolerance = +/-10%

Voltage = 40 V DC

Case Size = A

C indicates standard catalog part

F indicates RoHS part

T indicates non-RoHS part

S indicates screened according to MIL

SOLID ELECTROLYTE: CATHODE AND ENCAPSULATION

The cathode is formed by manganese dioxide which is a grey semi-conductor.

It is obtained by dipping the pellets into a manganese nitrate water solution

which impregnates the internal structure; this solution is then decomposed in a

high temperature oven to obtain manganese dioxide. This operation is repeated

several times. The nature and quality of this semi-conductor greatly influence

the electrical parameters (especially the series resistance).

To finish the negative plate, a graphite coating and then a silver coating are

deposited on the outside surface of the manganese dioxide.

The positive nickel lead is welded on the tantalum wire and the negative lead

is either soldered with wire leads, or pasted with a silver epoxy for surface

mount models.

WET ELECTROLYTE: CATHODE AND ENCAPSULATION

The cathode (for wet tantalum capacitors) is formed by a sulphuric acid solution.

The anodized tantalum pellet is impregnated with this solution and then placed

in a silver or tantalum case, into which some equivalent gelled solution has been

previously deposited.

The case is then crimped on the internal PTFE bush to create the sealing. The

final steps are either the soldering of a glass metal seal, or the crimping of an

elastomer seal on the top of the case.

BURN-IN - SORTING - INSPECTION

All the products are then submitted to a final burn-in, with differing severities

depending upon the required characteristics of each type (temperature, voltage,

time,etc.).

Sorting, marking and inspection operations follow. These procedures are the

same for approved and non-approved parts (with exception of periodic testing).

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