www.niccomp.com | Technical Support: [email protected] February 4, 2009 SUB: Component testing after Long Period on Shelf Reliability testing of solid and liquid type aluminum electrolytic capacitor after long storage The following pages show the reliability of solid and liquid aluminum electrolytic capacitors after long storage times (from two years up to nine years storage). Summary of reliability data after long storage Liquid Type Aluminum Electrolytic Capacitor 1. Initial electrical characteristics measured for 10 pcs of 3 NACE items (SMT V-Chip +85°C rated) after 2-year storage did not show any significant change of capacitance, tanδ and leakage current. All within error tolerance level of measurement. 2. Observed capacitance decreased by 2~4 % after 3 year or 4 year storage for 20pcs of 2 type Vchip (SMT) item in annual measurement of electrical characteristics. There was no change of leakage current. 3. In high temperature load life test conducted on long term storage items ranging 5-year up to 9year storage, the life curves are very consistent with newly manufactured capacitors and no significant deterioration in endurance performance was observed. 4. Zero cross time testing was used to evaluate wetting ability of Sn100% or Sn/Bi0.5% plated terminal installed in lead free V chip items. Wetting times increased after steam aging at 105oC for 8 hours or 16 hours, but remained stable under such highly accelerated conditions. • According to one correlation method between steamed aging and floor aging, 8hr steam aging may be translated to 1.6 year storage in 30oC/70%RH environment and 16 hr aging corresponds to 3.2 year natural storage. Within these testing conditions, solderability degradation did not occur. Solid Type Aluminum Electrolytic Capacitor 1. Initial characteristics measured for 10 pcs of three NPC items (SMT Flat Chip +105°C rated) after 2-year, 4-year and 5-year storage did not show any significant change of capacitance, tan, ESR and leakage current. All within error tolerance level of measurement. 2. Comparison between newly manufactured capacitors and 4-year storage sample of NPC series, showed very similar performance in reliability testing for high temperature load life, high temperature storage, damp heat, shelf test and temperature cycling test. 3. In solderability comparison testing, 8-hour steam aged samples showed good solderability using test method of dipping and zero cross time wetting test. Prepared by: NIC TPMG Department [ [email protected] ] ISO9001: 2000 REGISTERED - Page 1 of 23 - www.niccomp.com | Technical Support: [email protected] Reliability Test Data after Long Storage Liquid Type Aluminum Electrolytic Capacitors 1. Typical electrical characteristics change over two years storage (Page 3) 2. Typical electrical characteristics change over three years storage (Page 4) 3. Typical electrical characteristics change over four years storage (Page 5) 4. Reliability test of long term storage items ¾ ¾ High temperature life data i. Comparison between new and 5 year storage (Page 6 & 7) ii. SMT V-chip after 5 year storage (Page 8 & 9) iii. Radial LDD after 6 year storage (Page 10 & 11) iv. Radial LDD after 9 year storage (Page 12 & 13) Solderability test data (Zero cross time) i. ZCT comparison data (Pages 14 & 15) ISO9001: 2000 REGISTERED - Page 2 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors 1. The characteristic change after long times storage ¾ Electrical characteristics of three NACE part numbers after 2 year storage ¾ No significant change of electrical properties of NACE after 2 year storage Part No: NACE4R7M25V4x5.5F Part No: NACE220M16V4x5.5F Part No: NACE101M6.3V6.3x5.5F ISO9001: 2000 REGISTERED - Page 3 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors Change of electrical properties during 3 year storage TEST CONDITION ： 3 years at room temperature with no voltage applied. Part Number: NATT470M100V12.5X14HBF n = 20pcs. ISO9001: 2000 REGISTERED - Page 4 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors Change of electrical properties during 3 year floor storage TEST CONDITION ：4 years at room temperature with no voltage applied. Part Number: NRSZ101M100V12.5X20F n = 20pcs. ISO9001: 2000 REGISTERED - Page 5 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors LIFE TEST COMPARISON - ALUMINUM ELECTROLYTIC CAPACITORS Comparison between newly produced and 5-year storage samples Part Number: NRWX331M16V10X12.5 … Rated for 2000 hours @ +125°C Number of samples = 10pcs Testing Duration: 3,000 hours @ +125°C Graphed Data (Charted data on 2nd page) ISO9001: 2000 REGISTERED - Page 6 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors Part Number: NRWX331M16V10X12.5 … Rated for 2000 hours @ +125°C Number of samples = 10pcs Testing Duration: 3,000 hours @ +125°C Charted Data Newly produced - NRWX331M16V10X12.5 Charted data After 5 year storage - NRWX331M16V10X12.5 ISO9001: 2000 REGISTERED - Page 7 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors LIFE TEST RESULTS - ALUMINUM ELECTROLYTIC CAPACITOR Life test after 5-year storage under normal condition Part Number: NACZ331M16V8X10.5 … Rated for 2000 hours @ +105°C Number of samples = 10pcs Testing Duration: 4,000 hours @ +105°C Graphed Data ISO9001: 2000 REGISTERED - Page 8 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors Life test after 5-year storage under normal condition Part Number: NACZ331M16V8X10.5 … rated for 2000 hours @ +105°C Number of samples = 10pcs Testing Duration: 4,000Hrs hours @ +105°C Charted data ISO9001: 2000 REGISTERED - Page 9 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors LIFE TEST RESULTS ALUMINUM ELECTROLYTIC CAPACITOR Life test after 6-year storage under normal condition Part Number: NRWA101M25V6.3X11 … rated for 1000 hours @ +105°C Number of samples = 10pcs Testing Duration: 3,000Hrs hours @ +105°C Graphed Data (Charted data on 2nd page) ISO9001: 2000 REGISTERED - Page 10 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors Life test after 6-year storage under normal condition Part Number: NRWA101M25V6.3X11 … rated for 1000 hours @ +105°C Number of samples = 10pcs Testing Duration: 3,000 hours @ +105°C Charted data ISO9001: 2000 REGISTERED - Page 11 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors LIFE TEST RESULTS ALUMINUM ELECTROLYTIC CAPACITOR Life test after 9-year storage under normal condition Part Number: NRWA470M25V5X11 … … rated for 1000 hours @ +105°C Number of samples = 10pcs Testing Duration: 2,000 hours @ +105°C Graphed Data (Charted data on 2nd page) ISO9001: 2000 REGISTERED - Page 12 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors Life test after 9-year storage under normal condition Part Number: NRWA470M25V5X11 … rated for 1000 hours @ +105°C Number of samples = 10pcs Testing Duration: 2,000 hours @ +105°C Charted data ISO9001: 2000 REGISTERED - Page 13 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors Solderability test data (Zero Cross Time) After performing PCT (Steam Aging) treatment, measure Z.C.T. ( Zero Cross Time ) with Meniscus Measurement apparatus SAT-5000 made by RHESCA • NA-200 flux made by Tamura Kaken be used as soldering flux [ http://tamurausa.com ] • Three terminal materials compared o Sn finish o Sn + Bi finish o Sn + Pb finish Solder Alloy (Each n=10) Solder Temperature PCT (Each n=10) A H63A Sn-Pb B Sn- 2.5Ag - 1Bi - 0.5Cu Pb-Free A 230 +/- 2°C Sn-Pb B 245 +/- 2°C Pb-Free A Temperature 105degC 100%RH 1.22X*10(5) Pa, Aging 16Hrs B Temperature 105degC 100%RH 1.22X*10(5) Pa, Aging 8Hrs Lead Wire diameter: 0.45mm Post Steam Aged Sn- Pb Process Post Steam Aged Pb-Free Process FINDING: 8-Hour & 16-Hour steam aging (~ equivalent to 3.2 years normal storage) has minimal impact on wetting ZCT conditions ISO9001: 2000 REGISTERED - Page 14 of 23 - www.niccomp.com | Technical Support: [email protected] Liquid Type Aluminum Electrolytic Capacitors Solderability test data (Zero cross time) ZCT Test Result – Measuring Temperature - 25℃ Humidity：41％ Solder: Senju Kinzoku SnAgCu Pretreatment: PCT 105oC Humidity 100% Pressure 1.22*10(5) 8Hrs ISO9001: 2000 REGISTERED - Page 15 of 23 - www.niccomp.com | Technical Support: [email protected] Reliability Test Data after Long Storage Solid Type Aluminum Electrolytic Capacitors 1. The electrical characteristic impact of long time storage • 2. 2-year, 4-year and 5-year storage (Page 17) Reliability test of long times storage items Comparison reliability test of newly produced and long time storage (after 4 years) items • Endurance Test (Page 18) • Shelf Test (Page 19) • Damp Heat (Page 20) • Temperature Cycling (Page 21) Comparison of new samples and samples after 8-Hour Steam Aging • Solderability (Dipping – Page 22) • Solderability (ZCT wetting – Page 24) ISO9001: 2000 REGISTERED - Page 16 of 23 - www.niccomp.com | Technical Support: [email protected] Solid Type Aluminum Electrolytic Capacitors Characteristic change after long times storage Solid electrolyte construction does not exhibit deterioration (by chemical reaction) of anode foil. Measurement result of the characteristic change under long time storage. Measurement results of long time storage (2-, 4- & 5-years) product (n = 10) NPC221M2D7XATRF … After 5-year storage under normal condition NPC221M2D7XATRF … After 4-year storage under normal condition NPC221M2D7XATRF … After 2-year storage under normal condition Solid type aluminum electrolytic capacitors (NIC NPC & NSP series) should be stored under the shipping condition (sealed moisture barrier bag) ISO9001: 2000 REGISTERED - Page 17 of 23 - www.niccomp.com | Technical Support: [email protected] Solid Type Aluminum Electrolytic Capacitors Comparison reliability test of newly produced and long time storage (after 4 years) items Endurance Test Part Number: NPC221M2D7XATRF Test conditions Reflow condition 260deg.C × 2 times Before reflow condition 30℃ 70%RH 168hrs Applied Voltage Rated voltage (2 VDC) Temperature 105℃ Time 2000 hrs Number n=20 ISO9001: 2000 REGISTERED - Page 18 of 23 - www.niccomp.com | Technical Support: [email protected] Solid Type Aluminum Electrolytic Capacitors Comparison reliability test of newly produced and long time storage (after 4 years) items Shelf Test Part Number: NPC221M2D7XATRF Test conditions Reflow condition 260deg.C × Before reflow condition 30℃ 70%RH 168hrs 2 times Applied Voltage No applied voltage (0 VDC) Temperature 105℃ Time 2000 hrs Number n=20 ISO9001: 2000 REGISTERED - Page 19 of 23 - www.niccomp.com | Technical Support: [email protected] Solid Type Aluminum Electrolytic Capacitors Comparison reliability test of newly produced and long time storage (after 4 years) items Damp Heat Test Part Number: NPC221M2D7XATRF Test conditions Reflow condition 260deg.C × Before reflow condition 30℃ 70%RH 168hrs 2 times Applied Voltage No applied voltage Temperature 60℃ 90%R.H Time 2000 hrs Number n=20 ISO9001: 2000 REGISTERED - Page 20 of 23 - www.niccomp.com | Technical Support: [email protected] Solid Type Aluminum Electrolytic Capacitors Comparison reliability test of newly produced and long time storage (after 4 years) items Temperature Cycling Test Part Number: NPC221M2D7XATRF Test conditions Reflow condition 260deg.C × Before reflow condition 30℃ 70%RH 168hrs 2 times Applied Voltage No applied voltage Temperature -55℃ / 30min ⇔ 105℃ / 30min Time 200 cycles Number n=20 ISO9001: 2000 REGISTERED - Page 21 of 23 - www.niccomp.com | Technical Support: [email protected] Solid Type Aluminum Electrolytic Capacitors Solderability (post steam-aging) Dip Test Part Number: NPC221M2D7XATRF PCT 105℃ 100%RH 1.22MPa for 8 hours Before test condition Test conditions Solder Type Pb Free (Sn-3.0Ag-0.5Cu) Flux Resin ethanol solution ( 25wt%) Solder Temperature 245±2℃ Immersing depth 3±0.5 sec Zero cross time n=10 Test result of no processing product Test result of PCT 105℃ 100%RH 8 hours ISO9001: 2000 REGISTERED - Page 22 of 23 - www.niccomp.com | Technical Support: [email protected] Solid Type Aluminum Electrolytic Capacitors Solderability (post steam-aging) Zero Cross Time Wetting Test Part Number: NPC221M2D7XATRF PCT 105℃ 100%RH 1.22MPa Before test condition Test conditions 8 hours No processing Solder Type Pb Free (Sn-3.0Ag-0.5Cu) Flux Resin ethanol solution ( 25wt%) Solder Temperature 245±2℃ Immersing speed 2mm / sec Immersing depth 0.1mm Zero cross time Within 3sec Number N=10 Test Result: PCT 105℃ No processing 100%RH Ave 0.67 0.66 Max 1.47 1.24 Min 0.23 0.22 Test result of no processing product Test result of PCT 105℃ 100%RH 8 hours ISO9001: 2000 REGISTERED - Page 23 of 23 - 8 hours