564R20TSD10HE

FAQFrequently Asked Questions

• What design considerations should I account for when integrating the 564R20TSD10HE into a high-voltage power supply circuit? The 564R20TSD10HE is rated for 2kV, making it suitable for primary filtering and voltage division roles in power supplies operating up to 2000V. When integrating this capacitor, ensure your PCB layout maintains adequate creepage and clearance distances between the radial leads and adjacent conductors to prevent arcing—typically 0.1" minimum for each kilovolt of operating voltage. The X7R dielectric remains stable across -25°C to 105°C, so capacitance drift remains within ±10% even under thermal cycling in industrial environments. However, account for the 564R20TSD10HE's 1000 pF value when calculating total filtering capacitance; in parallel configurations for higher capacitance, verify that lead inductance and inter-component spacing do not introduce resonance peaks that could compromise voltage regulation.
• Can the 564R20TSD10HE replace lower-voltage ceramic capacitors in my existing design, and what are the practical differences? The 564R20TSD10HE's 2kV rating allows it to replace capacitors rated at 1kV or lower in the same footprint class, provided the 0.402" diameter and 0.591" height clearances fit your mechanical constraints. The radial through-hole leads (0.252" spacing) are standard for this class, so lead-to-hole alignment typically presents no surprises. The key trade-off is that high-voltage ceramic capacitors like the 564R20TSD10HE may exhibit higher dielectric absorption than low-voltage equivalents, which can introduce charge redistribution artifacts in precision analog circuits—measure settling time if your application is time-sensitive. The X7R coefficient ensures stable performance, but verify that the ±10% tolerance meets your circuit's ripple or resonance requirements; tighter tolerance alternatives may exist if ±10% is inadequate.
• How does the 564R20TSD10HE perform in high-temperature industrial applications, and what thermal management steps are necessary? Rated for continuous operation to 105°C, the 564R20TSD10HE exhibits X7R behavior, meaning capacitance change is within ±10% across the full -25°C to 105°C range—one of the most stable ceramic temperature coefficients available. In industrial environments with 80°C ambient + self-heating from ripple current, the capacitor remains well within its thermal envelope. However, confirm that your circuit's expected ripple current (in mA RMS) does not exceed the manufacturer's published IRMS rating; if ripple current approaches limits, thermal cycling can accelerate ceramic capacitor aging. For long-term reliability in 85°C+ environments, derate the 564R20TSD10HE's working voltage by 10–15% below the 2kV rating and verify solder joint inspection intervals during production and field maintenance, as thermal cycling stresses both the capacitor case and lead bonds.
• What are the mechanical and electrical trade-offs between the 564R20TSD10HE and surface-mount alternatives for high-voltage applications? The 564R20TSD10HE is a through-hole radial component with 0.252" lead spacing and 0.591" seated height—substantially larger than typical surface-mount disc capacitors. Through-hole mounting offers robust mechanical retention and eliminates wave-solder stress on SMD pads, making it preferable for vibration-prone or high-shock environments (such as industrial motor drives). However, the radial footprint consumes more board real estate, and lead-form variations during insertion can strain the component if tooling tolerances slip. Surface-mount alternatives like chip packages occupy less area but introduce reflow-soldering risks and require careful land-pattern design to avoid solder-joint cracking under thermal cycling. If you are migrating from SMD to 564R20TSD10HE for reliability or vice versa, account for the footprint and thermal-path changes; through-hole designs benefit from better thermal dissipation to the PCB ground plane via lead vias, while SMD designs depend on thermal vias beneath the pad itself.
• Is the 564R20TSD10HE suitable for DC filtering in soft-start or inrush-current applications, or should I use a film capacitor instead? The 564R20TSD10HE ceramic dielectric can tolerate DC bias without permanent degradation, but its capacitance decreases under applied voltage—a phenomenon called voltage coefficient. At 2kV rated voltage, capacitance may drop 5–20% depending on the actual operating DC bias and the ceramic material grade. For soft-start or inrush-limiting circuits, where the capacitor must hold charge reliably and capacitance stability is critical, film capacitors (polyester or polypropylene) often perform better because they have negligible voltage coefficient and superior charge-retention characteristics. However, film capacitors in 2kV ratings are physically larger and more expensive. If the 564R20TSD10HE is chosen for cost and size, design the soft-start threshold or timing circuit with measured capacitance (at operating voltage) rather than nameplate values, and include margin to account for tolerance and aging.
• How do I verify that the 564R20TSD10HE will not fail under continuous high-voltage stress in a 1500V operating circuit? Operating the 564R20TSD10HE at 1500V (75% of rated 2kV) places it comfortably within its voltage envelope, but several factors determine long-term reliability. First, confirm that peak transient spikes do not exceed 2.2–2.4kV; ceramic capacitors degrade progressively when exposed to repeated overvoltage events. Second, ensure creepage and clearance around the radial leads meet high-voltage spacing rules (≈0.1" per kilovolt), and inspect the PCB for moisture ingress or contamination that could trigger tracking or arcing across the surface. Third, the 564R20TSD10HE's Cera-Mite 564R series does not publish an explicit failure rate (MTBF), so rely on design margin and periodic functional test sampling during production; if your application demands FIT (failures in time) data, consult Vishay for military-grade or screened alternatives. Finally, accelerated-life testing at 85°C, 1.6kV bias, and 1000+ hours can validate your design margin before full production release.
• What substitutes or equivalent parts can I use if the 564R20TSD10HE becomes unavailable, and what are the risks? Vishay's published substitutes for the 564R20TSD10HE include S102K39X7RP65L0R, S102K39X7RP63K5R, 564R2DF0D10, S102K39X7RP6UL5R, and 564R20TSD10. The S102K39X7RP series (Vishay MKS2) are film capacitors offering superior voltage linearity and lower dielectric absorption, but they are significantly larger and more expensive; migration to film requires PCB layout revision and cost justification. The 564R2DF0D10 and 564R20TSD10 are ceramic variants within the same Cera-Mite family and typically pin-compatible, but verify exact dimensions and lead spacing with the datasheet to confirm mechanical fit. When evaluating alternatives, confirm that the substitute's operating temperature range, voltage rating, and tolerance match or exceed the original 564R20TSD10HE specification; a lower-voltage substitute will not provide the same design margin, and a tighter tolerance substitute may increase cost without benefit if ±10% meets your circuit needs.
• What moisture and corrosion concerns apply to the 564R20TSD10HE in outdoor or marine environments? The 564R20TSD10HE carries RoHS3 compliance and REACH Unaffected status, indicating lead-free solder compatibility and absence of restricted substances. However, the Moisture Sensitivity Level (MSL) is listed as Not Applicable, meaning the ceramic capacitor itself does not absorb moisture in the way that plastic-packaged semiconductors do. The primary corrosion risk lies in the radial leads and solder joints: in outdoor or marine salt-spray environments, the leads (typically nickel-plated steel or similar) can corrode if exposed to high humidity and salt deposits. Mitigation includes conformal coating over the entire assembly (acrylic or urethane), potting the component in epoxy, or using a high-voltage connector/cable assembly to minimize exposed lead length. The 564R20TSD10HE's ceramic body is inert, but inspect for cracks or delamination during assembly; any damage to the dielectric will accelerate failure under high-voltage stress in humid conditions.
• How should I handle lead bending and soldering of the 564R20TSD10HE without introducing mechanical stress or electrical degradation? The 564R20TSD10HE's straight radial leads are designed for direct insertion into through-hole pads without pre-forming. Avoid sharp bends near the lead exit from the ceramic body; instead, bend the lead smoothly at least 0.25" from the capacitor case to distribute stress and prevent internal ceramic cracking. When wave-soldering or hand-soldering, maintain tip temperature below 260°C and dwell time under 5 seconds to avoid thermal shock to the solder joint and ceramic-to-lead interface. If the capacitor will experience vibration or thermal cycling, consider staking or potting the component after soldering to mechanically support the leads and reduce flexure-induced fatigue. Inspect solder joints under magnification (10–20×) for cracks or voids; a dull, grainy appearance indicates cold-solder defects that can open under thermal stress, leading to intermittent or permanent failure. Test samples from each production batch to confirm solder joint integrity before field deployment.
• What is the expected capacitance drift of the 564R20TSD10HE over its operating life, and how should I design margin into my circuit? The 564R20TSD10HE's X7R ceramic exhibits ±10% capacitance tolerance at room temperature and rated voltage. Over its operating life, several factors cause drift: voltage coefficient reduces capacitance under DC bias (typically 5–20% at full 2kV rating), temperature coefficient is inherent to X7R (±10% across -25°C to 105°C), and long-term aging can cause 1–3% additional loss over 1000 hours at elevated temperature and voltage. When designing, use the minimum capacitance value (original nameplate minus 10% tolerance, minus voltage coefficient loss, minus aging) as the worst-case design point. For timing or resonance-critical circuits, measure capacitance from production samples at expected operating temperature and bias voltage, then apply a 15–20% additional margin. High-precision applications (such as precision oscillators or measurement instrumentation) should substitute with film or C0G/NP0 capacitors instead, as ceramic X7R capacitors cannot meet sub-percent stability requirements over extended periods.