UPV1H390MGD1TD

FAQFrequently Asked Questions

• Can the UPV1H390MGD1TD be used as a direct replacement for older aluminum electrolytic capacitors rated at 50V in legacy industrial equipment? The UPV1H390MGD1TD is a 39 µF 50 V aluminum electrolytic capacitor with a 5000-hour lifetime rating at 105°C. While the voltage and capacitance ratings may match legacy parts, replacement viability depends on the original component's ESR characteristics, ripple current handling, and temperature profile of your specific application. The UPV1H390MGD1TD has an impedance of 500 mOhms; if your circuit design relies on lower ESR performance or higher ripple current capacity, verification against the original part's datasheet is necessary. Additionally, the radial lead spacing of 0.098" (2.50mm) must match your PCB layout. Thermal stress in industrial environments operating near 105°C will consume the 5000-hour lifetime more rapidly, so lifetime calculations should account for your actual operating temperature using industry-standard derating curves.
• What are the key design considerations when selecting the UPV1H390MGD1TD for power supply filtering in a 48V telecom application? The UPV1H390MGD1TD is rated for 50 V maximum, which provides minimal headroom above a 48 V nominal supply. In telecom systems where input voltage transients, charging surges, or load-dump events can exceed nominal voltage, this limited margin creates reliability risk. At 39 µF capacitance, the charge storage may be insufficient for hold-up time requirements in certain backup scenarios. The 500 mOhms impedance and 5000-hour lifetime at 105°C must be evaluated against your thermal management; if ambient temperature plus self-heating from ripple current approaches 105°C, the operational lifetime will shorten significantly. Consider whether a higher-voltage-rated capacitor (such as a 63V or 80V variant) or a larger capacitance value would better suit the application's transient and hold-up requirements, even if it requires PCB layout modification.
• How does the 5000-hour lifetime specification of the UPV1H390MGD1TD apply to continuous operation at different temperatures? The UPV1H390MGD1TD is rated for 5000 hours at the maximum operating temperature of 105°C. This represents the expected service life under worst-case thermal stress. However, aluminum electrolytic capacitors follow an exponential derating curve where operational lifetime doubles approximately every 10°C reduction in temperature below the rated maximum. For example, at 85°C the lifetime may extend to 10,000 hours or more. Conversely, if ripple current or ambient conditions drive the capacitor's internal temperature above 105°C, the 5000-hour rating is exceeded and premature failure risk increases rapidly. In long-term industrial or automotive applications, you must calculate the actual junction temperature of the UPV1H390MGD1TD using ripple current, ambient temperature, and thermal resistance values from Nichicon's detailed datasheet, then apply appropriate derating to confirm that field lifetime meets your system's warranty or maintenance interval.
• What is the ripple current handling capability of the UPV1H390MGD1TD, and how does it affect thermal management in switching power supplies? The product specification sheet does not explicitly state the ripple current rating for the UPV1H390MGD1TD. This parameter is critical for switching power supply design because ripple current generates internal heating through ESR losses. With an impedance of 500 mOhms, you can estimate power dissipation as I²R, but the ripple current limit itself must be obtained from Nichicon's UPV series datasheet. Exceeding the maximum ripple current causes accelerated electrolyte evaporation and drastically shortens the 5000-hour lifetime. Before finalizing a design using the UPV1H390MGD1TD in a high-frequency switching application, request the detailed ripple current specification from the manufacturer or authorized distributor, then cross-check against your predicted input ripple at the operating frequency and input voltage range.
• Is the UPV1H390MGD1TD suitable for applications requiring capacitors to survive periodic voltage surge or transient overstress? The UPV1H390MGD1TD has a rated voltage of 50 V and an operating temperature range of -55°C to 105°C. The product specification does not document surge voltage tolerance or overstress derating characteristics. Aluminum electrolytic capacitors in general can tolerate brief voltage transients slightly above rated voltage, but sustained or repeated overstress degrades the oxide dielectric layer, leading to leakage current increase and premature failure. If your application experiences load-dump, switching transients, or line surge events that could drive the UPV1H390MGD1TD above 50 V, you must either provide voltage clamping, select a higher-rated capacitor (such as 63 V or 80 V), or implement inrush limiting to protect the component. Relying on the 50 V rating without margin is not recommended for harsh automotive or industrial environments.
• How does the ±20% capacitance tolerance of the UPV1H390MGD1TD affect timing-critical or resonant circuit designs? The UPV1H390MGD1TD carries a ±20% capacitance tolerance, meaning the actual value may range from 31.2 µF to 46.8 µF. In general-purpose filtering and power supply applications, this tolerance is acceptable because the load is not sensitive to small variations in capacitance. However, in resonant circuits, timing networks, or precision oscillator designs, a ±20% variation could shift the resonant frequency or timing constant outside acceptable bounds. If your design requires tighter capacitance accuracy, you may need to select a film capacitor or a tighter-tolerance electrolytic from Nichicon's product line, or implement post-assembly trimming or calibration. When designing with the UPV1H390MGD1TD, always validate that the worst-case tolerance extremes (31.2 µF and 46.8 µF) still meet your circuit's performance and stability requirements.
• What are the practical differences between the UPV1H390MGD1TD and equivalent 39 µF 50 V capacitors from competing manufacturers such as Rubycon or Sanyo? The UPV1H390MGD1TD is a Nichicon part in the UPV series, characterized by 5000-hour lifetime at 105°C, 500 mOhms impedance, and radial through-hole mounting. Equivalent 39 µF 50 V capacitors from Rubycon (such as the PXE series) or Sanyo (such as the KZE series) may offer differing ESR, ripple current ratings, lifetime specifications, or physical dimensions. Rubycon parts may feature lower ESR (beneficial for high-frequency ripple), while Sanyo components might target different temperature ranges or ripple current profiles. Before substituting the UPV1H390MGD1TD with a competitor's part, obtain the detailed datasheet and confirm that impedance, ripple current, lifetime at your operating temperature, and lead spacing are compatible with your PCB and thermal design. A lower-ESR alternative may offer better performance but could have different footprint requirements or cost trade-offs. Consult the BOM management system or your supplier to ensure the substitute meets all electrical and mechanical constraints.
• Can the UPV1H390MGD1TD be soldered and reworked using standard through-hole assembly techniques without degrading the capacitor? The UPV1H390MGD1TD is rated for Tape & Box (TB) packaging and is designed for through-hole mounting with radial leads spaced 0.098" (2.50mm) apart. Standard wave soldering or manual soldering at typical through-hole reflow temperatures (approximately 250°C for a few seconds) is compatible with the component. However, aluminum electrolytic capacitors are sensitive to solder heat; if the lead is heated above the temperature rating for too long (typically >5 seconds at >250°C), the internal seal can degrade, allowing moisture ingress and reducing the 5000-hour lifetime. Rework operations involving desoldering and re-soldering the UPV1H390MGD1TD carry additional risk because repeated thermal cycling and extended heat exposure can damage the capacitor's internal structure. If rework is necessary, use a desoldering iron or vacuum desoldering tool with controlled temperature, and allow the component to cool before re-installing. Consider whether the design should use sockets or other techniques to minimize rework frequency.
• What storage and shelf-life conditions apply to the UPV1H390MGD1TD to maintain its specified performance after long periods of inventory? Aluminum electrolytic capacitors, including the UPV1H390MGD1TD, are hygroscopic and subject to electrolyte evaporation and dielectric degradation during storage. Although the product specification does not explicitly state shelf-life limits, industry best practice recommends storing the UPV1H390MGD1TD in dry conditions (relative humidity <60%) at room temperature (typically 15–25°C). Exposure to high humidity or elevated temperature during storage accelerates electrolyte loss and increases leakage current, eroding the 5000-hour lifetime rating when the capacitor is finally soldered into service. Nichicon typically recommends that electrolytic capacitors be stored no longer than 2–3 years before use; after extended storage, consider performing a "forming" step (applying rated voltage for several hours) to re-establish the oxide layer. If your inventory includes UPV1H390MGD1TD units from stock held >2 years, consult Nichicon's storage guidelines or request a current product sample to verify that no performance degradation has occurred.
• How should the UPV1H390MGD1TD be handled during manufacturing to avoid mechanical or electrical damage? The UPV1H390MGD1TD is a radial aluminum electrolytic capacitor with a cylindrical can measuring 0.248" diameter and 0.492" height, mounted on through-hole leads. During PCB assembly, the component is susceptible to mechanical damage if leads are bent too sharply or if the can is crushed during insertion. Avoid bending the leads more than 90 degrees at a point closer than 0.25" from the can base, as excessive bending can crack the internal connections or compromise the hermetic seal. Additionally, static discharge (ESD) is generally not a concern for electrolytic capacitors, but mechanical shock or vibration during transport can dislodge solder joints or crack the capacitor can. After soldering, verify that the UPV1H390MGD1TD is mechanically stable on the PCB and that no stress is applied to the leads. In automated assembly lines, use appropriate tooling and pressure settings to avoid over-insertion or collision damage. If the can is visibly dented or leads are bent, replace the component rather than attempting repair.
• What leakage current specification applies to the UPV1H390MGD1TD, and how does it affect low-power standby circuit design? The product specification does not provide a leakage current value for the UPV1H390MGD1TD. Leakage current in aluminum electrolytic capacitors is typically in the range of 0.01 I_rated or lower (where I_rated is the DC current rating), but the exact value depends on capacitance, voltage, temperature, and manufacturing batch. In low-power standby or energy-harvesting applications where microamperes of leakage current represent a significant load, the absence of explicit leakage data creates design uncertainty. Request the leakage current specification from Nichicon for the UPV1H390MGD1TD at 50 V and 25°C, then verify that the value is acceptable for your standby power budget. High leakage current, combined with high voltage (50 V) and high temperature (105°C), can also indicate potential dielectric degradation or infant mortality risk; if leakage measurements on sample units exceed typical expectations, escalate the concern to Nichicon or consider a different capacitor technology.
• Is the UPV1H390MGD1TD compatible with lead-free soldering processes, and does RoHS compliance affect long-term reliability? The UPV1H390MGD1TD is marked as ROHS3 Compliant, indicating it meets the European Union's Restriction of Hazardous Substances directive. Lead-free soldering (typically SAC305, a tin-silver-copper alloy) operates at higher temperatures (~250°C) than traditional lead-based solder, and this elevated temperature exposure can stress aluminum electrolytic capacitors. The UPV1H390MGD1TD must tolerate lead-free reflow without internal seal degradation; however, repeated thermal cycling from lead-free assembly and subsequent system operation can reduce the effective 5000-hour lifetime if operating temperatures remain elevated. ROHS3 compliance does not guarantee long-term reliability in harsh thermal environments; instead, it certifies that restricted substances (lead, cadmium, mercury, etc.) are not present. If your application requires extended service life and low thermal cycling stress, confirm with Nichicon that the UPV1H390MGD1TD has been validated for lead-free assembly and your specific operating temperature profile.
• What are the voltage derating recommendations for the UPV1H390MGD1TD when used in continuous DC bias applications? The UPV1H390MGD1TD is rated for 50 V continuous DC voltage. Industry best practice recommends operating aluminum electrolytic capacitors at no more than 70–80% of the rated voltage in continuous-use applications to extend lifetime and reduce leakage current. For the UPV1H390MGD1TD, this suggests a practical operating point of approximately 35–40 V DC. If your circuit requires operation near the full 50 V rating, verify that the 5000-hour lifetime at 105°C is sufficient for your warranty and maintenance interval. Additionally, if the capacitor experiences AC ripple superimposed on the DC bias, the combined peak voltage (DC + ripple peak) must not exceed 50 V; exceeding this threshold increases dielectric stress and accelerates degradation. Consult Nichicon's detailed derating curves or application notes to determine the safe operating envelope for the UPV1H390MGD1TD in your specific voltage and temperature scenario.
• How does the impedance specification (500 mOhms) of the UPV1H390MGD1TD compare to modern polymer capacitors, and when should a polymer alternative be considered? The UPV1H390MGD1TD has an impedance of 500 mOhms at a specified frequency (typically 100 kHz for aluminum electrolytic capacitors). Modern polymer electrolytic capacitors, such as those from Nichicon's own PL or PZ series, can offer impedance values as low as 50–150 mOhms, providing superior high-frequency performance and lower ESR losses. If your switching power supply or high-frequency filtering circuit experiences significant ripple current or requires rapid transient response, a polymer capacitor may deliver better thermal performance and longer effective lifetime despite similar rated capacitance and voltage. However, polymer capacitors typically cost more than traditional aluminum electrolytics and may have different voltage or temperature derating characteristics. For cost-sensitive or legacy designs where 500 mOhms impedance is acceptable, the UPV1H390MGD1TD remains suitable. Evaluate the trade-off between ESR performance, cost, size, and thermal management for your specific application before deciding whether to migrate from the UPV1H390MGD1TD to a polymer alternative.
• What environmental or storage stresses could cause the UPV1H390MGD1TD to fail prematurely, and how can these be mitigated? The UPV1H390MGD1TD is an aluminum electrolytic capacitor rated for -55°C to 105°C operation and 5000-hour lifetime at 105°C. Primary failure modes include electrolyte evaporation (accelerated by high temperature and ripple current), dielectric breakdown (caused by voltage overstress), and seal degradation (triggered by moisture ingress or mechanical damage). Storage in high-humidity environments (>80% RH) or at elevated temperatures (>40°C) accelerates electrolyte loss even before the capacitor is energized. Thermal cycling from repeated power-on/off cycles or transient overvoltage events (load-dump, surge, or switching transients) can crack the internal connections or oxide layer. To mitigate these risks, maintain controlled storage conditions (15–25°C, <60% RH), avoid voltage overstress by using clamping or selecting a higher-rated part, and minimize thermal cycling by designing robust power-supply regulation. In harsh automotive or industrial environments, consider periodic inspection or accelerated life testing (ALT) of sample units to detect degradation trends before field failures occur.