Type 944U Polypropylene Film Capacitors for DC Filtering Metallized Polypropylene Dielectric Type 944U is specifically designed for use in medium power DC filtering applications. The low inductance internal construction utilizes low loss metallized polypropylene for high ripple current capability. Male or female terminal options offer design flexibility in a rugged UL 94VO rated flame retardant plastic case and resin fill. Applications Inverters: DC Link DC Output Filter Specifications Complies with the EU Directive 2002/95/EC requirement restricting the use of Lead (Pb), Mercury (Hg), Cadmium (Cd), Hexavalent chromium (Cr(VI)), PolyBrominated Biphenyls (PBB) and PolyBrominated Diphenyl Ethers (PBDE). Capacitance Range: Voltage Range: Capacitance Tolerance: Operating Temperature Range: Dielectric Withstand: 33 µF to 220 µF 800 Vdc to 1400 Vdc ±10% standard –40 ºC to +85ºC 150% Rated Vdc 10s - Between Terminals 4000 Vac 60s - Terminals to Case Ratings Rated H Voltage Height (Vdc) (mm) H Height (in) Max ESR 10kHz (mΩ) Typical ESL (nH) Max Irms 55ºC (A) 40 1.67 0.5 20 800 51 2.01 0.8 220 800 64 2.52 944U660K102AA* 66 1000 40 944U101K102AB* 100 1000 944U141K102AC* 140 944U470K122AA* Catalog Part Number Cap (µF) 944U101K801AA* 100 800 944U161K801AB* 160 944U221K801AC* Thermal Resistance Θcc (ºC/W) Θca (ºC/W) 74 2.8 5.2 30 73 3.0 4.5 1.0 40 72 3.1 4.0 1.67 0.6 20 70 2.8 5.2 51 2.01 0.8 30 68 3.0 4.5 1000 64 2.57 1.0 40 65 3.1 4.0 47 1200 40 1.67 0.7 20 67 2.8 5.2 944U700K122AB* 70 1200 51 2.01 1.0 30 65 3.0 4.5 944U101K122AC* 100 1200 64 2.57 1.3 40 64 3.1 4.0 944U330K142AA* 33 1400 40 1.67 0.8 20 64 2.8 5.2 944U520K142AB* 52 1400 51 2.01 1.1 30 60 3.0 4.5 944U700K142AC* 70 1400 64 2.57 1.4 40 59 3.1 4.0 * M = M8 Stud I = M5 Insert Additional values available upon request. CDE Cornell Dubilier•1605 E. Rodney French Blvd.•New Bedford, MA 02740•Phone: (508)996-8561•Fax: (508)996-3830 www.cde.com Type 944U Polypropylene Film Capacitors for DC Filtering Outline Drawing Dimensions: Millimeters (Inches) H dimension in Ratings Table I Suffix M Suffix Tolerance ±0.5mm (±0.019”), otherwise specified Part Numbering System 944U 101 K 801 Type Capacitance Tolerance Voltage 944U 101 = 100 µF K = ±10% 801 = 800 Vdc A A Diameter D (mm) Height H (mm) A = 84.5 M Terminal A = 40 M = M8 Thd Stud I = M5 Thd Insert 700 = 70 µF 102 = 1000 Vdc B = 51 470 = 47 µF 122 = 1200 Vdc C = 64 142 = 1400 Vdc CDE Cornell Dubilier•1605 E. Rodney French Blvd.•New Bedford, MA 02740•Phone: (508)996-8561•Fax: (508)996-3830 www.cde.com Type 944U Polypropylene Film Capacitors for DC Filtering Expected Lifetime Predictions To use the Expected Lifetime curves calculate Va ⁄Vr and core temperature T. Start by estimating: Applied dc voltage Va Ripple Current I Ripple Frequency f Ambient Temperature Ta Airflow speed v Units: A=m² T, Ta & Tc=°C C=μF θ, θca & θcc =°C/W ESR=mΩ v=m/s f=kHz Va &Vr=Vdc I=A NOTE: The temperature rise in the 944U is I²(ESR) times the thermal resistance θ. The ESR is mainly the metal resistance; the metal resistance is the 10 kHz ESR. For operation below 10kHz add the dielectric resistance. It is the dielectric dissipation factor—no more than 0.0002—times the capacitive reactance, i.e., 0.0002 ⁄(2πfC). That’s equal to 31.83 ⁄(fC). 1. Start with the 10 kHz ESR from the Ratings table. If frequency is less than 10 kHz, add 31.83 ⁄(fC). 2. Compute total thermal resistance θ as the sum of core-to-case thermal resistance θcc and case-to-ambient thermal resistance θca. Both are in the Ratings table but θca is for still air and θcc is for 10 kHz or less. For frequency > 10 kHz multiply θcc by [1+(f –10)/100], e.g., for 75 kHz multiply θcc by 1.65. For moving air use the capacitor surface area A and airflow speed v to calculate θca = 1 ⁄[A(5+17.5(v+0.1)0.66)]. 3. Compute Va ⁄Vr and the core temperature T. T = Ta + I²(ESR)θ 4. Look up estimated lifetime from the Expected Lifetime curves. 5. If you want a longer expected lifetime, choose a capacitor with higher voltage rating or consider using multiple capacitors in parallel to share the ripple current. Permissible Voltage Surge Duty for 100,000 Hour Life Expectancy at 50 ºC Core Temperature Factor 1.67x 1.50x 1.30x 1.10x 1.00x Duration Frequency t≤ 100 ms 1x/day t≤ 5 minutes 1x/day t≤ 2.5 hours 1x/day t≤ 9.6 hours 1x/day balance (11.9 h) 1x/day CDE Cornell Dubilier•1605 E. Rodney French Blvd.•New Bedford, MA 02740•Phone: (508)996-8561•Fax: (508)996-3830 www.cde.com Type 944U Polypropylene Film Capacitors for DC Filtering Typical Performance Curves 160µF 800Vdc ESR vs Frequency and Temperature 4 3.5 ESR (mΩ) 3 2.5 85ºC 65ºC 2 45ºC 25ºC 0ºC 1.5 -20ºC -40ºC 1 100 1000 10000 100000 Frequency (Hz) 160µF 800Vdc Rated Ripple Current, Still Air, 5kh Life 90.00 45ºC 80.00 55ºC Rated Ripple Current (A) 70.00 65ºC 60.00 50.00 75ºC 40.00 30.00 85ºC 20.00 10.00 0.00 10 100 1000 10000 100000 Frequency (Hz) CDE Cornell Dubilier•1605 E. Rodney French Blvd.•New Bedford, MA 02740•Phone: (508)996-8561•Fax: (508)996-3830 www.cde.com