Technical Data Sheet - Octopart

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8 Rated Capacitance (C R ) This is the designed value of capacitance, usually specified in micro-Farads (µF), when measured with an a.c. voltage 5 A at the test voltage. Short duration surge voltage - certain product ranges are able to withstand a higher surge voltage but for a shorter period of time. Where applicable these capacitors shall withstand 100 surges at 20°C as described below: Charge capacitor to rated voltage then charge up to short duration surge voltage for a period of
Inductance Some inductance is present in all wound aluminium electrolytic capacitors as a result of the construction of the winding and the tabbing. The value is usually not more than a few tens of nano-henrys and is more or less constant with changes in temperature and frequency. Ripple Current (I R ) Ripple current, caused by the application of an alternating voltage waveform, will generate heat inside the capacitor. The power loss is given by: P = Ir 2 .esr (Watts) Where: P = Power loss Ir = Ripple Current (Amps) The maximum power a capacitor can handle is dependent upon the style and surface area of the can, the thermal dissipation factor, and the permissible core temperature rise within the capacitor. Thus for a given capacitor a maximum continuous ripple current rating can be established. Capacitors have a maximum designed core temperature which is higher than the specified maximum ambient operating temperature for the component. At lower ambient temperatures higher ripple currents can be applied provided the maximum core temperature is not exceeded. Factors are given in the data sheets. Increased ripple currents are also possible at higher frequencies, since the e.s.r. is lower. Heat-sinking and forced air cooling will both aid heat transfer and thus allow higher ripple currents. Note, some additional heat is generated by the leakage current, but this is normally much less than that generated by the ripple current and so can be ignored. Since the ripple current raises the temperature of the capacitor, it has a significant effect on the operational life of the component. Further details are given under lifeexpectancy. Temperature Range The maximum operating temperature or upper category temperature is the maximum temperature at which the capacitor is designed to operate continuously. Choice of foils, electrolyte and encapsulation materials ultimately determine this figure. The lower category temperature is the lowest temperature at which the capacitor is designed to operate continuously. The electrolyte resistivity and viscosity both increase at low temperatures causing loss of capacitance and increased e.s.r. Climatic Category The Climatic Category, in accordance with IEC 68-1, is based upon three groups of digits which decode as follows: LCT UCT DH 40 / 085 / 56 Where: LCT = Lower category temperature °C (e.g. 40 = -40°C) UCT = Upper category temperature °C (e.g. 85 = +85°C) DH = Damp heat test days (IEC 68) Shelf Life The capacitance, ESR and impedance of a capacitor will not change significantly after extended storage periods, however the leakage current will very slowly increase. BHC products are particularly stable and allow a shelf life in excess of ten years at room temperature. The shelf life is shown in the figure below. Within region 1 the leakage current should remain within its specified limit when measured. In region 2 the leakage current may initially exceed the specified limit and if the measured value is higher than twice the specified limit then re-ageing is recommended. Storage Temperature °C 85 65 45 25 5 -15 -35 -55 Electrical Characteristics Re-age Procedure Apply the rated voltage to the capacitor at room temperature for a period of one hour, or until the leakage current has fallen to a steady value below the specified limit. During re-ageing a maximum charging current of twice the specified leakage current or 5mA (whichever is greater) is suggested. 1 1 10 100 Thousands of hours 9
Page 1 and 2: part of the EVOX RIFA GROUP
Page 3 and 4: REFERENCE DATA Quick reference guid
Page 5 and 6: Cap µF 33 47 68 100 150 220 330 47
Page 7 and 8: Optimised Design Service Approximat
Page 9: The manufacturing process begins wi
Page 13 and 14: Advantages Simple construction In
Page 15 and 16: mounting method, which is at a high
Page 17 and 18: 5. DISPOSAL Aluminium Electrolytic
Page 19 and 20: series Listed here are only samples
Page 21 and 22: DIMENSIONS (sleeved) mm TECHNICAL D
Page 23 and 24: Rated voltage d.c. 16V d.c. (18.4V
Page 25 and 26: Rated voltage d.c. 350V d.c. (385V
Page 27 and 28: Rated voltage d.c. 10V d.c. (11.5V
Page 33 and 34: TECHNICAL DATA Related documents IE
Page 35 and 36: Rated voltage d.c. 35V d.c. (40V su
Page 41 and 42: Rated voltage d.c. 35V d.c. (40V su
Page 45 and 46: A high CV range of snap-in capacito
Page 51 and 52: ALP Pin and mounting configurations
Page 53 and 54: SLIT FOIL CAPACITORS Modern electro
Page 55 and 56: INSULATED VERSION M8 Stud (M12 Stud
Page 57: SPECIAL PART NUMBERS Used when the

Technical Data Sheet - Octopart

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