B57234S0400M000

Product division: NTC Product name: Inrush Current Limiter Product type:S234/ 40/M Ordering code:B57234S0400M000 Data sheet APPLICATION : NTC-thermistor for inrush current limiting in peripheral communication equipment, e.g. in switch-mode power supplies FEATURES : • Black coated thermistor disk • Coating material is flame retardant (UL 94 V-0 approved) • Kinked leads of tinned copper wire • Lead spacing 7.5 mm • Manufacturer’s logo, NTC and resistance value stamped in white • High stability of electrical characteristic • Terminals solderable in accordance with IEC 60068-2-20, test ta, method 1 • ICL support to fulfill the requirements according EN 61000 of power circuits • Usable in series connections up to 265 Vrms • The component is compliant with ROHS (DIRECTIVE 2002/95/EC OF THE EUROPEAN PARLIAMENT AND THE COUNCIL of 27 January 2003 on the restriction of the use of certain hazardous substances in electrical and electronic equipment • Also available on tape  EPCOS AG 2005. Reproduction, publication and dissemination of this data sheet, enclosures hereto and the information contained therein without EPCOS' prior express consent is prohibited. Purchase orders are subject to the General Conditions for the Supply of Products and Services of the Electrical and Electronics Industry recommended by the ZVEI (German Electrical and Electronic Manufacturers' Association), unless otherwise agreed. ISSUE DATE 22.07.05 ISSUE a PUBLISHER KB S PE PAGE 1/10 Product division: NTC Product name: Inrush Current Limiter Product type:S234/ 40/M Ordering code:B57234S0400M000 Data sheet DRAWING : b LS LL h th b 15.0max mm th 7.0 max mm h LL LD LS 22.0 max 32 + 3 mm mm mm mm ± 0.05 0.8 7.5 ± 0.8 Approx. weight : 2.0 [g] LD RATINGS AND CHARACTERISTICS Lower/upper category temperature Resistance tolerance Rated temperature B value tolerance Max. power at 25°C Dissipation factor (in air) Thermal cooling time constant (in air) Heat capacity R25 Imax B25/100 [Ω] 40 [A] 3.4 [K] 3450 Ordering Code B57234S0400M000 ISSUE DATE T ∆R/RN TN ∆B/B Pmax δth τth Cth 22.07.05 ISSUE [°C] [%] [°C] [%] [W] [mW/K] [s] [mJ/K] -55/+170 ± 20 25 ±3 3.6 approx. 17 approx. 90 approx. 1530 CT at 110 CT at 230 Parameter Parameter VAC VAC for R(I) for R(I) k n [µF] [µF] 1600 400 1.82 -1.38 a PUBLISHER KB S PE PAGE 2/10 Product division: NTC Product name: Inrush Current Limiter Product type:S234/ 40/M Ordering code:B57234S0400M000 Data sheet Maximum continuous current Imax : The Imax denotes the maximum permissable continuous current (dc or rms values for sine-shaped ac) in the temperature range 0 to 65°C. Maximum current derating (I / Imax) : I / Imax  Percent of Imax = 100 1 −  1 TA − 65° C   Tmax − 65° C  TA = ambient temperature ( TA > 65°C ) Tmax = 170°C -25 0 170 65 Ta Fig. 1. - Maximum current derating (I / Imax ) Maximum switchable capacity (CT) : The maximum switchable capacity (CT) is the maximum capacity which may be discharged across the thermistor. See Fig.2 Maximum switchable capacity measuring circuit. Dependence of NTC resistance on current : The resistance effective in the usual current range can be approximated with the fit parameter k and n. RNTC = k * In RNTC k, n I 0.3 * I max < I ≤ I max Resistance value to be determined at current I [Ω] Fit parameter, see table with ordering codes Current flowing through the NTC (insert numerical value in A) The calculated values only serve as an estimate for operation in still air at an ambient temperature of 25°C. MARKING : • • • • EPCOS – logo resistance value NTC Date code with 4 digits (year and week of production): 0540 (example for week 40 in year 2005) ISSUE DATE 22.07.05 ISSUE a PUBLISHER KB S PE PAGE 3/10 Product division: NTC Product name: Inrush Current Limiter Product type:S234/ 40/M Ordering code:B57234S0400M000 Data sheet Resistance - Temperature Curve 10,000.00 B57234S0400Mxxx 1,000.00 Resistance [Ohm] 100.00 10.00 1.00 0.10 -50.00 -25.00 0.00 25.00 50.00 75.00 100.00 125.00 150.00 175.00 Temperature [°C] ISSUE DATE 22.07.05 ISSUE a PUBLISHER KB S PE PAGE 4/10 Product division: NTC Product name: Inrush Current Limiter Product type:S234/ 40/M Ordering code:B57234S0400M000 Data sheet ROBUSTNESS OF TERMINATIONS : The leads meet the requirements of IEC 60068-2-21. Test Test conditions Remarks Tensile strength Test Ua1: Fasten body with a force applied to each lead 10 [N] for 10 [s] No visible damage Bending strength Test Ub: Fasten body with two 90°-bends in opposite direction at a force of 10 [N] No visible damage (Peel off of coating along the lead accepted) RELIABILITY REQUIREMENTS : ∆R25/R25 (typical) Remarks Storage at upper category temperature T: 170°C t: 1 000 h < 10 % No visible damage Temperature of air: 40°C Relative humidity of air: 93 % Duration: 21 days