MKP 1839 HQ Vishay Roederstein AC and Pulse Metallized Polypropylene Film Capacitors MKP Axial Type FEATURES Supplied loose in box, taped on ammopack or reel available on request • Compliant to RoHS directive 2002/95/EC Ødt lt l lt d ENCAPSULATION Plastic-wrapped, epoxy resin sealed. Flame retardant. APPLICATIONS High current and high pulse operations CLIMATIC TESTING CLASS ACC. TO IEC 60068-1 55/110/56 REFERENCE STANDARDS CAPACITANCE RANGE (E12 SERIES) IEC 60384-17 0.1 µF to 3.3 µF MARKING CAPACITANCE TOLERANCE Manufacturer’s logo; code for dielectric material; manufacturer’s type designation; C-code; rated voltage-code; tolerance-code; special n °C-value; tolerance; rated voltage; year and week; manufacturer’s location ±5% LEADS Tinned wire DIELECTRIC RATED TEMPERATURE Polypropylene film 85 °C ELECTRODES MAXIMUM APPLICATION TEMPERATURE Metallized At 85 °C: UC = 1.0 UR at 110 °C: UC = 0.7 UR CONSTRUCTION PULL TEST ON LEADS Series construction ≥ 20 N in direction of leads according to IEC 60068-2-21 RATED (DC) VOLTAGE 630 V, 850 V, 1250 V, 1600 V BENT TEST ON LEADS 2 bends trough 90° with half of the force used in pull test RELIABILITY RATED (AC) VOLTAGE 300 V, 400 V, 450 V, 600 V Operation life > 300 000 h Failure rate < 5 FIT (40 °C and 0.5 x UR) DETAIL SPECIFICATION For more detailed data and test requirements contact: [email protected] www.vishay.com 258 For technical questions, contact: [email protected] Document Number: 28162 Revision: 21-Apr-10 MKP 1839 HQ AC and Pulse Metallized Polypropylene Film Capacitors Vishay Roederstein MKP Axial Type COMPOSITION OF CATALOG NUMBER MULTIPLIER (nF) SPECIAL LETTER FOR TAPED CAPACITANCE (numerically) 0.1 2 1 3 10 4 100 5 Bulk Example: 468 = 680 nF R Reel G Ammopack (1) Special HIGH QUALITY CAPACITOR TYPE MKP 1839 X XX 08 X VOLTAGE (Vdc) HQ X TOLERANCE 63 = 630 V 4 ±5% 08 = 850 V 12 = 1250 V 13 = 1600 V Note (1) For detailed tape specifications refer to “Packaging Information”: www.vishay.com/doc?28139 or end of catalog SPECIFIC REFERENCE DATA DESCRIPTION VALUE Tangent of loss angle: at 1 kHz at 10 kHz at 100 kHz 0.1 µF < C ≤ 0.47 µF ≤ 3 x 10-4 ≤ 5 x 10-4 ≤ 35 x 10-4 0.47 µF < C ≤ 1 µF ≤3x ≤8x ≤ 50 x 10-4 1 µF < C ≤ 3.3 µF 10-4 ≤ 3 x 10-4 10-4 ≤ 10 x 10-4 ≤ 60 x 10-4 Rated voltage pulse slope (dU/dt)R at URdc 630 VDC 850 VDC 1250 VDC 1600 VDC 500 V/µs 1000 V/µs 1000 V/µs 1000 V/µs UP-P peak-to-peak voltage 700 V 1130 V 1400 V 1600 V 2000 V 2560 V R between leads, for C ≤ 0.33 µF at 500 V, 1 min > 100 GΩ RC between leads, for C > 0.33 µF at 500 V, 1 min > 30 000 s R between interconnecting and wrapped film at 500 V, 1 min > 100 GΩ Withstanding (DC) voltage (cut off current 10 mA), rise time 100 V/s Withstanding (DC) voltage between leads and wrapped film (1.4 x URac + 2000) Maximum application temperature Document Number: 28162 Revision: 21-Apr-10 1008 V 1360 V 1 min 2840 V, 1 min 110 °C For technical questions, contact: [email protected] www.vishay.com 259 MKP 1839 HQ Vishay Roederstein AC and Pulse Metallized Polypropylene Film Capacitors MKP Axial Type VOLTAGE CODE 63 630 VDC/300 VAC CAPACITANCE DIMENSIONS max. (mm) VOLTAGE CODE 08 850 VDC/400 VAC MASS dt ± 0.08 mm SPQ (1) DIMENSIONS max. (mm) MASS dt ± 0.08 mm SPQ (1) (µF) D L (g) (mm) Pieces D L (g) (mm) Pieces 0.1 7 26.5 0.9 0.8 2000 8.5 31.5 1.6 0.8 1500 0.15 8 26.5 1.2 0.8 1750 10 31.5 2.3 0.8 1000 0.18 8.5 26.5 1.4 0.8 1500 11 31.5 2.7 0.8 850 0.22 9.5 26.5 1.6 0.8 1250 11.5 31.5 3.2 0.8 750 0.27 10 26.5 1.9 0.8 1000 13 31.5 3.9 0.8 1000 0.33 11 26.5 2.3 0.8 900 14 31.5 4.6 0.8 1000 0.39 10.5 31.5 2.6 0.8 900 15 31.5 5.4 0.8 1000 0.47 11 31.5 3.0 0.8 750 16.5 31.5 6.5 0.8 1000 0.56 12 31.5 3.5 0.8 650 15 31.5 5.4 0.8 1000 0.68 13 31.5 4.2 0.8 500 16.5 31.5 6.5 0.8 1000 0.82 14 31.5 5.1 0.8 1000 18 31.5 7.8 1.0 750 1 16 31.5 6.1 0.8 900 19.5 31.5 9.4 1.0 600 1.5 19 31.5 9.0 1.0 600 24 31.5 13.9 1.0 400 2.2 23 31.5 13.1 1.0 450 - - - - - 3.3 28 31.5 19.5 1.0 300 - - - - - MASS dt ± 0.08 mm SPQ (1) (g) (mm) Pieces VOLTAGE CODE 13 1600 VDC/600 VAC VOLTAGE CODE 12 1250 VDC/450 VAC CAPACITANCE DIMENSIONS max. (mm) L MASS dt ± 0.08 mm SPQ (1) DIMENSIONS max. (mm) (g) (mm) Pieces D (µF) D L 0.1 8.5 31.5 1.6 0.8 1500 10.5 31.5 2.7 0.8 1000 0.15 10 31.5 2.3 0.8 1000 12.5 31.5 3.9 0.8 600 0.18 11 31.5 2.7 0.8 1000 13.5 31.5 4.6 0.8 500 0.22 11.5 31.5 3.2 0.8 800 15 31.5 5.5 0.8 500 0.27 13 31.5 3.9 0.8 650 16.5 31.5 6.7 0.8 900 0.33 14 31.5 4.6 0.8 500 18 31.5 8.1 1.0 750 0.39 15 31.5 5.4 0.8 1000 19.5 31.5 9.5 1.0 600 0.47 16.5 31.5 6.5 0.8 900 21.5 31.5 11.3 1.0 500 0.56 18 31.5 7.7 1.0 750 23.5 31.5 13.4 1.0 400 0.68 20 31.5 9.2 1.0 600 25.5 31.5 16.2 1.0 350 0.82 21.5 31.5 11.1 1.0 500 - - - - - 1 23.5 31.5 13.4 1.0 400 - - - - - 1.5 - - - - - - - - - - 2.2 - - - - - - - - - - 3.3 - - - - - - - - - - Note (1) SPQ = Standard Packing Quantity www.vishay.com 260 For technical questions, contact: [email protected] Document Number: 28162 Revision: 21-Apr-10 MKP 1839 HQ AC and Pulse Metallized Polypropylene Film Capacitors Vishay Roederstein MKP Axial Type MOUNTING Normal Use The capacitors are designed for mounting on printed-circuit boards. The capacitors packed in bandoliers are designed for mounting in printed-circuit boards by means of automatic insertion machines. Specific Method of Mounting to Withstand Vibration and Shock In order to withstand vibration and shock tests, it must be ensured that the capacitor body is in good contact with the printed-circuit board. • For L ≤ 19 mm capacitors shall be mechanically fixed by the leads • For larger pitches the capacitors shall be mounted in the same way and the body clamped • The maximum diameter and length of the capacitors are specified in the dimensions table • Eccentricity as shown in the drawing below: 1 mm Storage Temperature • Storage temperature: Tstg = - 25 °C to + 40 °C with RH maximum 80 % without condensation Ratings and Characteristics Reference Conditions Unless otherwise specified, all electrical values apply to an ambient free air temperature of 23 °C ± 1 °C, an atmospheric pressure of 86 kPa to 106 kPa and a relative humidity of 50 % ± 2 %. For reference testing, a conditioning period shall be applied over 96 h ± 4 h by heating the products in a circulating air oven at the rated temperature and a relative humidity not exceeding 20 %. Document Number: 28162 Revision: 21-Apr-10 For technical questions, contact: [email protected] www.vishay.com 261 MKP 1839 HQ Vishay Roederstein AC and Pulse Metallized Polypropylene Film Capacitors MKP Axial Type CHARACTERISTICS Capacitance as a function of ambient temperature (typical curve) Tangent of loss angle as a function of frequency (typical curve) 103 Dissipation Factor x 1-4 ΔC/C (%) 4 2 102 3.3 µF 1.0 µF 0 0.1 µF -2 101 -4 100 -6 - 60 - 40 - 20 0 20 40 60 80 100 Tamb (°C) 102 120 Impedance as a function of frequency (typical curve) 103 103 104 105 f (Hz) 106 Max. DC and AC voltage as a function of temperature Impedance (Ω) 1.2 Factor Capacitance in µF 102 1 0.1 µF 101 0.8 0.22 µF 0.47 µF 1.0 µF 100 0.6 3.3 µF 10-1 0.4 10-2 0.2 10-3 104 105 106 107 f (Hz) 0 - 60 108 20 60 100 Tamb (°C) 103 103 VRMS (V) Max. RMS Voltage (sinewave) as a function of frequency VRMS (V) Max. RMS Voltage (sinewave) as a function of frequency - 20 102 102 0.1 µF 0.22 µF 0.47 µF 0.1 µF 0.22 µF 0.47 µF 1.0 µF 3.3 µF 101 Tamb ≤ 85 °C, 630 VDC 100 102 www.vishay.com 262 103 104 1.0 µF 3.3 µF 101 85 °C < Tamb ≤ 110 °C, 630 VDC 105 106 f (Hz) 107 100 102 103 For technical questions, contact: [email protected] 104 105 106 f (Hz) 107 Document Number: 28162 Revision: 21-Apr-10 MKP 1839 HQ AC and Pulse Metallized Polypropylene Film Capacitors Vishay Roederstein MKP Axial Type 103 103 VRMS (V) Max. RMS Voltage (sinewave) as a function of frequency VRMS (V) Max. RMS Voltage (sinewave) as a function of frequency 102 102 0.1 µF 0.22 µF 0.47 µF 0.1 µF 0.22 µF 0.47 µF 1.0 µF 101 1.0 µF 101 Tamb ≤ 85 °C, 850 VDC 100 102 103 85 °C < Tamb ≤ 110 °C, 850 VDC 104 105 106 f (Hz) 107 100 102 103 103 VRMS (V) 102 102 0.1 µF 0.22 µF 0.47 µF 1.0 µF 101 103 105 106 f (Hz) 107 0.1 µF 0.22 µF 0.47 µF 1.0 µF 101 Tamb ≤ 85 °C, 1250 VDC 100 102 104 Max. RMS Voltage (sinewave) as a function of frequency VRMS (V) Max. RMS Voltage (sinewave) as a function of frequency 103 85 °C < Tamb ≤ 110 °C, 1250 VDC 104 105 106 f (Hz) 107 100 102 104 105 106 f (Hz) 107 103 103 VRMS (V) Max. RMS Voltage (sinewave) as a function of frequency VRMS (V) Max. RMS Voltage (sinewave) as a function of frequency 103 102 102 0.1 µF 0.22 µF 0.47 µF 0.1 µF 0.22 µF 0.47 µF 101 101 Tamb ≤ 85 °C, 1600 VDC 100 102 10 3 Document Number: 28162 Revision: 21-Apr-10 10 4 10 5 6 10 f (Hz) 7 10 100 102 85 °C < Tamb ≤ 110 °C, 1600 VDC 103 104 For technical questions, contact: [email protected] 105 106 f (Hz) 107 www.vishay.com 263 MKP 1839 HQ Vishay Roederstein AC and Pulse Metallized Polypropylene Film Capacitors MKP Axial Type Max. allowed component rise (ΔT) as a function of the ambient temperature (Tamb) Insulation resistance as a function of ambient temperature (typical curve) 106 RC (s) ΔT (°C) 12 10 8 6 105 4 2 104 0 30 60 90 Tamb (°C) 0 - 60 120 - 20 20 60 Tamb (°C) 100 HEAT CONDUCTIVITY (G) AS A FUNCTION OF CAPACITOR BODY THICKNESS IN mW/°C DIAMETER (mm) www.vishay.com 264 HEAT CONDUCTIVITY (mW/°C) PITCH 26.5 mm PITCH 31.5 mm 7.0 8 - 8.0 10 - 8.5 11 12 9.5 12 - 10.0 13 15 10.5 - 16 11.0 15 17 11.5 - 18 12.0 - 19 12.5 - 20 13.0 - 21 13.5 - 22 14.0 - 23 15.0 - 25 16.0 - 28 16.5 - 29 18.0 - 32 19.0 - 34 19.5 - 36 20.0 - 37 21.5 - 40 23.0 - 44 23.5 - 45 24.0 - 47 25.5 - 51 28.0 - 57 For technical questions, contact: [email protected] Document Number: 28162 Revision: 21-Apr-10 MKP 1839 HQ AC and Pulse Metallized Polypropylene Film Capacitors Vishay Roederstein MKP Axial Type POWER DISSIPATION AND MAXIMUM COMPONENT TEMPERATURE RISE The power dissipation must be limited in order not to exceed the maximum allowed component temperature rise as a function of the free air ambient temperature. The power dissipation can be calculated according type detail specification “HQN-384-01/101: Technical Information Film Capacitors with the typical tgd of the curves”. The component temperature rise (ΔT) can be measured (see section “Measuring the component temperature” for more details) or calculated by ΔT = P/G: • ΔT = Component temperature rise (°C) • P = Power dissipation of the component (mW) • G = Heat conductivity of the component (mW/°C) MEASURING THE COMPONENT TEMPERATURE A thermocouple must be attached to the capacitor body as in: Thermocouple The temperature is measured in unloaded (Tamb) and maximum loaded condition (TC). The temperature rise is given by ΔT = TC - Tamb. To avoid radiation or convection, the capacitor should be tested in a wind-free. APPLICATION NOTE AND LIMITING CONDITIONS These capacitors are not suitable for mains applications as across-the-line capacitors without additional protection, as described hereunder. These mains applications are strictly regulated in safety standards and therefore electromagnetic interference suppression capacitors conforming the standards must be used. To select the capacitor for a certain application, the following conditions must be checked: 1. The peak voltage (UP) shall not be greater than the rated DC voltage (URDC) 2. The peak-to-peak voltage (UP-P) shall not be greater than the maximum (UP-P) to avoid the ionisation inception level 3. The voltage pulse slope (dU/dt) shall not exceed the rated voltage pulse slope in an RC-circuit at rated voltage and without ringing. If the pulse voltage is lower than the rated DC voltage, the rated voltage pulse slope may be multiplied by URDC and divided by the applied voltage. For all other pulses following equation must be fulfilled: T dU dU 2 2 × ∫ ⎛ --------⎞ × dt < U Rdc × ⎛ --------⎞ ⎝ dt ⎠ rated ⎝ dt ⎠ 0 T is the pulse duration. 4. The maximum component surface temperature rise must be lower than the limits (see figure max. allowed component temperature rise). 5. Since in circuits used at voltages over 280 V peak-to-peak the risk for an intrinsically active flammability after a capacitor breakdown (short circuit) increases, it is recommended that the power to the component is limited to 100 times the values mentioned in the table “Heat conductivity”. 6. When using these capacitors as across-the-line capacitor in the input filter for mains applications or as series connected with an impedance to the mains the applicant must guarantee that the following conditions are fulfilled in any case (spikes and surge voltages from the mains included). Document Number: 28162 Revision: 21-Apr-10 For technical questions, contact: [email protected] www.vishay.com 265 MKP 1839 HQ Vishay Roederstein AC and Pulse Metallized Polypropylene Film Capacitors MKP Axial Type Voltage Conditions for 6 Above Tamb ≤ 85 °C 85 °C < Tamb ≤ 110 °C URAC See “Maximum AC voltage as a function of temperature par. characteristics” Maximum temporary RMS-overvoltage (< 24 h) 1.25 x URAC 0.875 x URAC Maximum peak voltage (VO-P) (< 2 s) 1.6 x URDC 1.1 x URDC ALLOWED VOLTAGES Maximum continuous RMS voltage INSPECTION REQUIREMENTS General Notes: Sub-clause numbers of tests and performance requirements refer to the “Sectional Specification, Publication IEC 60384-17 and Specific Reference Data”. Group C Inspection Requirements SUB-CLAUSE NUMBER AND TEST CONDITIONS PERFORMANCE REQUIREMENTS SUB-GROUP C1A PART OF SAMPLE OF SUB-GROUP C1 4.1 Dimensions (detail) 4.3.1 Initial measurements Capacitance Tangent of loss angle at 100 kHz 4.3 Robustness of terminations Tensile: Load 30 N; 10 s Bending: Load 15 N; 90° 4.4 Resistance to soldering heat No pre-drying Method: 1A Solder bath: 280 °C ± 5 °C Duration: 10 s 4.4.2 Final measurements Visual examination No visible damage Legible marking Capacitance |ΔC/C| ≤ 2 % of the value measured initially Tangent of loss angle Increase of tan δ: For C ≤ 470 nF ≤ 0.001 (10 x 10-4) For C > 470 nF ≤ 0.0015 (15 x 10-4) Compared to values measured initially Insulation resistance ≥ 50 % of values specified in section “Insulation Resistance” of this specification Isopropylalcohol at room temperature Method: 1 Rubbing material: Cotton wool Immersion time: 5 min ± 0.5 min No visible damage Legible marking 4.14 As specified in chapter “General Data” of this specification Solvent resistance of the marking No visible damage SUB-GROUP C1B PART OF SAMPLE OF SUB-GROUP C1 4.6.1 Initial measurements 4.6 Rapid change of temperature Capacitance Tangent of loss angle at 100 kHz θA = - 55 °C θB = + 110 °C 5 cycles Duration t = 30 min Visual examination www.vishay.com 266 For technical questions, contact: [email protected] No visible damage Document Number: 28162 Revision: 21-Apr-10 MKP 1839 HQ AC and Pulse Metallized Polypropylene Film Capacitors Vishay Roederstein MKP Axial Type SUB-CLAUSE NUMBER AND TEST 4.7 Vibration 4.7.2 4.9 Final inspection Shock 4.9.3 Final measurements CONDITIONS Mounting: See section “Mounting” of this specification Procedure B4 Frequency range: 10 Hz to 55 Hz Amplitude: 0.75 mm or Acceleration 98 m/s² (whichever is less severe) Total duration 6 h Visual examination Mounting: See section “Mounting” for more information Pulse shape: Half sine Acceleration: 490 m/s² Duration of pulse: 11 ms Visual examination Capacitance Tangent of loss angle Insulation resistance SUB-GROUP C1 COMBINED SAMPLE OF SPECIMENS OF SUB-GROUPS C1A AND C1B 4.10 Climatic sequence 4.10.2 Dry heat 4.10.3 4.10.4 Damp heat cyclic Test Db, first cycle Cold Damp heat cyclic Test Db, remaining cycles 4.10.6.2 Final measurements PERFORMANCE REQUIREMENTS No visible damage No visible damage |ΔC/C| ≤ 2 % of the value measured initally Increase of tan δ: For C ≤ 470 nF ≤ 0.001 (10 x 10-4) For C > 470 nF ≤ 0.0015 (15 x 10-4) Compared to values measured initially ≥ 50 % of values specified in section “Insulation Resistance” of this specification Temperature: 110 °C Duration: 16 h Temperature: - 55 °C Duration: 2 h 4.10.6 Voltage proof = URDC for 1 min within 15 min after removal from testchambers Visual examination Capacitance Tangent of loss angle Insulation resistance SUB-GROUP C2 4.11 Damp heat steady state 4.11.1 Initial measurements 4.11.3 Final measurements Capacitance Tangent of loss angle at 1 kHz Visual examination Voltage proof = URDC for 1 min within 15 min after removal from testchamber Capacitance Tangent of loss angle Insulation resistance Document Number: 28162 Revision: 21-Apr-10 No breakdown or flashover No visible damage Legible marking |ΔC/C| ≤ 3 % of the value measured initially Increase of tan δ: For C ≤ 470 nF ≤ 0.001 (10 x 10-4) For C > 470 nF ≤ 0.0015 (15 x 10-4) Compared to values measured in 4.3.1 or 4.6.1 as applicable ≥ 50 % of values specified in section “Insulation Resistance” of this specification No visible damage Legible marking No breakdown or flashover |ΔC/C| ≤ 3 % of the value measured in 4.11.1. Increase of tan δ: For C ≤ 470 nF ≤ 0.001 (10 x 10-4) For C > 470 nF ≤ 0.0015 (15 x 10-4) Compared to values measured in 4.11.1 ≥ 50 % of values specified in section “Insulation Resistance” of this specification For technical questions, contact: [email protected] www.vishay.com 267 MKP 1839 HQ Vishay Roederstein AC and Pulse Metallized Polypropylene Film Capacitors MKP Axial Type SUB-CLAUSE NUMBER AND TEST CONDITIONS PERFORMANCE REQUIREMENTS SUB-GROUP C3 A 4.12.1 Endurance test at 50 Hz alternative voltage Duration: 2000 h x URDC at 85 °C 0.875 x URDC at 110 °C 4.12.1.1 Initial measurements Capacitance Tangent of loss angle at 100 kHz 4.12.1.3 Final measurements Visual examination No visible damage Legible marking Capacitance |ΔC/C| ≤ 5 % compared to values measured in 4.12.1.1 Tangent of loss angle Increase of tan δ: For C ≤ 470 nF ≤ 0.001 (10 x 10-4) For C > 470 nF ≤ 0.0015 (15 x 10-4) Compared to values measured in 4.12.1.1 Insulation resistance ≥ 50 % of values specified in section “Insulation Resistance” of this specification For - 55 °C to 20 °C 0 % ≤ |ΔC/C| ≤ 2.75 % or for 20 °C to 110 °C: - 5.5 % ≤ |ΔC/C| ≤ 0 % As specified in section “Capacitance” of this specification SUB-GROUP C4 4.2.6 Temperature characteristics Initial measurement Intermediate measurements Capacitance Capacitance at - 55 °C Capacitance at 20 °C Capacitance at 110 °C 4.13 Charge and discharge 10 000 cycles Charged to URDC Discharge resistance: U n ( Vdc ) R = ---------------------------------------2.5 × C ( dU ⁄ dt ) 4.13.1 Initial measurements 4.13.3 Final measurements www.vishay.com 268 Capacitance Tangent of loss angle at 100 kHz Capacitance |ΔC/C| ≤ 3 % of the value measured in 4.13.1 Tangent of loss angle Increase of tan δ: For C ≤ 470 nF ≤ 0.001 (10 x 10-4) For C > 470 nF ≤ 0.0015 (15 x 10-4) Compared to values measured in 4.13.1 Insulation resistance ≥ 50 % of values specified in section “Insulation Resistance” of this specification For technical questions, contact: [email protected] Document Number: 28162 Revision: 21-Apr-10 Legal Disclaimer Notice Vishay Disclaimer All product specifications and data are subject to change without notice. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners. Document Number: 91000 Revision: 18-Jul-08 www.vishay.com 1