25SMD100M6.3X5.5

The 25SMD100M6.3X5.5 is rated for 2000 hours at 105C. Following the Arrhenius equation, lifetime approximately doubles for every 10C decrease. Expected lifetimes: 4000 hours at 95C, 8000 hours at 85C, 16000 hours at 75C. Consumer electronics typically operate at 40-60C internal temperature, where expected lifetime can exceed 100,000 hours (over 11 years). LED drivers may operate at higher temperatures (60-80C) depending on thermal design. Voltage derating further extends lifetime - operating at 18V instead of 25V can double expected life. These calculations make SMD capacitors suitable for consumer products with typical 5-10 year expected life.

Use voltage and temperature derating to achieve required lifetime for consumer applications.

The 25SMD100M6.3X5.5 has ESR of 1.2 ohm max at 100kHz, which is higher than ceramic capacitors of similar capacitance. A 100uF ceramic capacitor might have ESR of 0.01-0.1 ohm. However, aluminum electrolytic capacitors provide much higher capacitance density (more uF per unit volume) and lower cost per uF. For high-frequency decoupling above 1MHz, ceramic capacitors are preferred due to lower ESR and ESL. For power supply filtering and bulk capacitance below 1MHz, SMD aluminum electrolytic capacitors provide good performance at lower cost. Many designs use both - electrolytic for bulk capacitance and ceramics for high-frequency decoupling.

Use SMD electrolytic for bulk capacitance; combine with ceramics for high-frequency decoupling.

Proper PCB layout is important for SMD capacitor performance. Use adequate copper area for the pads to ensure good solder joint strength. The capacitor should be placed close to the load for effective decoupling. Minimize trace inductance between capacitor and IC by using short, wide traces or copper pours. For power supply filtering, place the capacitor near the power entry point. Thermal vias under the capacitor can help dissipate heat, though SMD capacitors have limited thermal capability compared to larger types. Avoid placing near heat-generating components. The footprint should follow Rubycon's recommended land pattern for reliable assembly. Consider the capacitor height for clearance to other components or enclosures.

Place close to loads, use short wide traces, and provide adequate copper for thermal management.

While SMD capacitors are designed for reflow soldering, hand soldering is possible with care. Use a fine-tip temperature-controlled soldering iron set to 350C maximum. Apply flux to the pads and capacitor terminals. Heat the pad and terminal simultaneously while applying solder. Limit heating time to 3-5 seconds per terminal to avoid thermal damage. Allow the capacitor to cool naturally between soldering each terminal. Avoid excessive heat which can damage the capacitor seal or electrolyte. For production quantities, reflow soldering is strongly recommended for consistency and reliability. Hand soldering should be limited to prototypes and repairs.

Use reflow for production; hand solder with care using temperature-controlled iron for prototypes.

Rubycon recommends a maximum storage period of 3 years at room temperature (5-35C) for SMD aluminum electrolytic capacitors. Storage should be in original packaging away from direct sunlight, high humidity, and corrosive atmospheres. The tape and reel packaging protects terminals from damage and contamination. Capacitors stored beyond 3 years may require reformation - applying rated voltage through a current-limiting resistor for several hours. High temperature or humidity during storage accelerates degradation. Always check the manufacturing date code and follow first-in-first-out inventory practices. For high-reliability applications, consider testing stored capacitors before use.

Store in original packaging at room temperature; use within 3 years of manufacture.