Design, Specifications are subject to change without notice. Ask factory for technical specifications before purchase and/ or use.

Whenever a doubt about safety arises from this product, please inform us immediately for technical consulation without fail.

Aluminum Electrolytic Capacitor

– EE19 –

(5)Clearance for Case Mounted Pressure

Relief Vents

Capacitors with case mounted pressure relief vents

require sufficient clearance to allow for proper vent

operation. The minimum clearances are dependent

on capacitor diameters as follows.

f6.3 to f16 mm : 2 mm minimum,

f18 to f35 mm : 3 mm minimum.

f40 mm or greater: 5 mm minimum

(6)Clearance for Seal Mounted Pressure

Relief Vents

A hole in the circuit board directly under the seal

vent location is required to allow proper release

of pressure.

(7)Wiring Near the Pressure Relief Vent

Avoid locating high voltage or high current wiring

or circuit board paths above the pressure relief

vent. Flammable, high temperature gas exceeding

100

°C may be released which could dissolve the

wire insulation and ignite.

(8)Circuit Board Patterns Under the Capacitor

Avoid circuit board runs under the capacitor as

electrolyte leakage could cause an electrical short.

(9)Screw Terminal Capacitor Mounting

q

Do not orient the capacitor with the screw terminal

side of the capacitor facing downwards.

q

Tighten the terminal and mounting bracket screws

within the torque range specified in the

specification.

1.6Electrical Isolation of the Capacitor

Completely isolate the capacitor as follows.

q Between the cathode and the case (except for

axially leaded B types) and between the anode

terminal and other circuit paths.

q Between the extra mounting terminals (on T types)

and the anode terminal, cathode terminal, and

other circuit paths.

1.7 Capacitor Sleeve

The vinyl sleeve or laminate coating is intended for

marking and identification purposes and is not meant

to electrically insulate the capacitor.

The sleeving may split or crack if immersed into

solvents such as toluene or xylene, and then exposed

to high temperatures.

Always consider safety when designing equipment

and circuits. Plan for worst case failure modes such

as short circuits and open circuits which could occur

during use.

(1)Provide protection circuits and protection devices

to allow safe failure modes.

(2)Design redundant or secondary circuits where

possible to assure continued operation in case of

main circuit failure.

2. Capacitor Handling Techniques

2.1 Considerations Before Using

(1) Capacitors have a finite life. Do not reuse or

recycle capacitors from used equipment.

(2) Transient recovery voltage may be generated in

the capacitor due to dielectric absorption. If

required, this voltage can be discharged with a

resistor with a value of about 1 k

Ω.

(3) Capacitors stored for long periods of time may

exhibit an increase in leakage current. This can

be corrected by gradually applying rated voltage

in series with a resistor of approximately 1 k

Ω.

(4) If capacitors are dropped, they can be damaged

mechanically or electrically. Avoid using dropped

capacitors.

(5) Dented or crushed capacitors should not be

used. The seal integrity can be compromised

and loss of electrolyte/shortened life can result.

2.2 Capacitor Insertion

(1) Verify the correct capacitance and rated voltage

of the capacitor.

(2) Verify the correct polarity of the capacitor before

inserting.

(3) Verify the correct hole spacing before insertion

(land pattern size on chip type) to avoid stress

on the terminals.

(4) Ensure that the auto insertion equipment lead

clinching operation does not stress the capacitor

leads where they enter the seal of the capacitor.

For chip type capacitors, excessive mounting

pressure can cause high leakage current, short

circuit, or disconnection.

2.3 Manual Soldering

(1) Observe temperature and time soldering

specifications or do not exceed temperatures of

350

°C for 3 seconds or less.

(2) If lead wires must be formed to meet terminal

board hole spacing, avoid stress on the leadwire

where it enters the capacitor seal.

(3) If a soldered capacitor must be removed and

reinserted, avoid excessive stress to the capacitor

leads.

(4) Aviod touching the tip of the soldering iron to the

capacitor, to prevent melting of the vinyl sleeve.

Mar. 2005