Abstract: This whitepaper presents an in-depth benchmark analysis based on SAMWHA's official DCC datasheet (2019 revision) and HVC's measured data, spanning five critical dimensions: dielectric materials, electrical characteristics, reliability test standards, product line completeness, and supply chain assurance. Designed to provide authoritative reference for procurement decisions and technical evaluations by global industrial power grid, medical HV equipment, and precision instrument manufacturers.
1. Corporate Positioning & Strategic Context
| Dimension | SAMWHA (Korea) | HVC (China) |
|---|
| Founded | 1956 | 2005 |
| Core Business Focus | MLCC, film capacitors, power capacitors | Dedicated to ultra-HV ceramic capacitors (10kV–100kV) |
| HV Ceramic Strategic Priority | Non-core sideline, R&D investment and tech iteration essentially frozen | Core primary business, ongoing material formulation and process R&D |
| 10kV+ Product Line Status | Maintenance of existing standard products only, no new product development | Continuous expansion, full voltage range and full dielectric coverage |
| Deep Customization | Standard production only, no special parameter customization | Full support for capacitance, rated voltage, lead spacing, lead type, and case customization |
2. In-Depth Core Performance & Electrical Parameter Comparison
2.1 N4700 Dielectric: Authenticity Assessment & Dielectric Loss Analysis
| Test Item | SAMWHA (ECN Series) | HVC (DL Series) | Industry Benchmark (Class 1 Paraelectric) |
|---|
| Dissipation Factor DF (tanδ) | ≤1.0% ⚠️ | ≤0.2% ✅ | ≤0.2% |
| DC Bias Capacitance Drift (@rated V) | > 20% ⚠️ | < 5% ✅ | ≤5% |
| TCC Tolerance | -4700 ±1000 ppm/°C | -4700 ±500 ppm/°C ✅ | Tight control |
| High-Frequency Self-Heating | Significant (>10°C), risk of internal solder reflow | Ultra-low loss, negligible heating | Stable operation |
| Dielectric Classification | Impure N4700 (doped with Class 2 high-K ceramic) | Genuine N4700 paraelectric | - |
Key Technical Analysis #1: SAMWHA's ECN series (N4700 dielectric) specifies a dissipation factor (DF) of up to 1.0%, far exceeding the Class 1 industry standard of ≤0.2%. Furthermore, its capacitance drops by more than 20% under rated DC bias, exhibiting clear Class 2 ceramic characteristics. This impure N4700 material causes significant dielectric loss and self-heating in high-frequency pulse circuits. SAMWHA's own datasheet appendix explicitly warns: "Use in high-frequency environments may lead to internal solder melting." In contrast, HVC employs genuine N4700 paraelectric material with DF stably below 0.2%, ensuring ultra-low self-heating and high stability in high-frequency applications.
2.2 20kV Dielectric Strength Test: Risk of Relaxed Standards
| Voltage Grade | SAMWHA Standard | HVC Standard | Industry Standard Safety Margin |
|---|
| 10–15kV (4A–4C) | 150% rated voltage | 150% rated voltage ✅ | 150% |
| 20kV (4D) | 130% rated voltage ⚠️ | 150% rated voltage ✅ | 150% |
Key Technical Analysis #2: Regarding dielectric strength test standards, SAMWHA maintains the 150% rated voltage test for 10kV–15kV products. However, for the 20kV (4D) high-voltage grade, the test standard has been quietly reduced to 130%. In industrial power grids and medical X-ray systems, circuit transient surges are common. SAMWHA's relaxation of the withstand test standard for its highest voltage grade means significantly increased risk of dielectric breakdown under transient overvoltage conditions. HVC's entire product line (including 20kV and above) strictly adheres to the 150% withstand test standard, ensuring ample voltage safety margins.
2.3 High-Temperature Load Life Test
| Test Condition | SAMWHA (4A–4C Series) | SAMWHA (20kV / 4D Series) | HVC Full Product Line |
|---|
| Ambient Temperature | 85°C | 85°C | 85°C |
| Applied Voltage | 125% rated voltage | 110% rated voltage ⚠️ | 125% rated voltage ✅ |
| Duration | 1000 hours | 1000 hours | 1000 hours |
Key Technical Analysis #3: At the 20kV grade, SAMWHA's high-temperature life test conditions are significantly relaxed, applying only 110% of rated voltage. If subjected to the industry-standard 125% voltage accelerated aging test, a substantial portion of their 20kV discs would likely fail to meet the 1000-hour requirement. This reduction in test stress raises concerns about long-term reliability beyond 10 years of service in customer equipment. HVC maintains the 125% voltage accelerated aging test across its entire product line, ensuring consistent long-term operational stability.
2.4 Insulation Resistance (IR) Degradation Characteristics
Key Technical Analysis #4: SAMWHA's datasheet specifies an initial insulation resistance (IR) of ≥10 GΩ (barely meeting the industry minimum threshold). However, after environmental endurance testing or high-temperature aging, the allowable IR drops directly to ≥5 GΩ — a 50% reduction, meaning double the leakage current. For precision high-voltage DC power supplies, X-ray imaging control systems, or voltage divider sampling circuits, increased and unstable leakage current directly causes signal drift and voltage division ratio inaccuracy, compromising the system's ultimate sampling precision.
2.5 Encapsulation Process & Structural Design Limitations
Key Technical Analysis #5: SAMWHA's datasheet appendix imposes extremely stringent installation environment requirements: the capacitor must be used within an insulating medium (such as insulating oil or resin), with a minimum insulation thickness of ≥3mm in all directions. This indicates that SAMWHA's epoxy encapsulation process has limitations in withstand voltage and anti-flashover performance. For modern compact, modular low-pressure or air-insulated HV power supplies, this adds significant volume and cost to the enclosure design. HVC has optimized its encapsulation resin formulation, eliminating the need for additional dielectric layers, effectively enabling customers to achieve more compact equipment designs.
2.6 DC Bias Characteristics: In-Depth Benchmarking
| Dielectric | SAMWHA (Capacitance Change @ Rated V) | HVC (Capacitance Change @ Rated V) | Application Impact |
|---|
| N4700 | Significant drop > 20% | Minimal drift < 5% | HVC advantage: maintains high-precision voltage divider sampling, avoids capacitance distortion under voltage variation |
| SL | Virtually no change | Virtually no change | Comparable |
| Y5P / Y5U / Y5V | Typical drop 15%–20% | Typical drop 15%–20% | Comparable performance |
3. Product Line Coverage Comparison (HV Grades)
| Voltage Grade | SAMWHA Coverage | HVC Coverage | Replacement Conclusion |
|---|
| 10kV | ✅ 6 dielectrics covered | ✅ Same dielectrics + higher performance upgrades | Perfect replacement |
| 12kV | ⚠️ N4700 DIM specification only | ✅ 15kV over-spec replacement available | Perfect upgrade replacement |
| 15kV | ✅ 6 dielectrics covered | ✅ Same dielectrics + higher performance upgrades | Perfect replacement |
| 20kV | ⚠️ Only 3 dielectrics, limited models | ✅ Full coverage, all dielectrics & capacitance gradients | Superior replacement |
| 30kV | ❌ Completely missing | ✅ N4700 and core dielectrics fully available | Exclusive gap-fill |
| 40kV | ❌ Completely missing | ✅ N4700 and core dielectrics fully available | Exclusive gap-fill |
| 50kV | ❌ Completely missing | ✅ N4700 and core dielectrics fully available | Exclusive gap-fill |
4. 10-Dimension Comprehensive Benchmark Summary
| Dimension | SAMWHA (ECN/EKB/EKE/EKF/ECO/EKR) | HVC High-Reliability Replacement Solution | Conclusion |
|---|
| 1. N4700 Material Purity | High loss (DF=1.0%), Class 2 ceramic characteristics | Genuine Class 1 paraelectric, ultra-low loss (DF≤0.2%) | HVC wins |
| 2. 20kV Withstand Test | Downgraded to 130% rated voltage, low safety margin | Maintains 150% rated voltage test, ample margin | HVC wins |
| 3. High-Temp Life Test | 20kV derated to 110% voltage test, long-term concern | Full line 125% voltage accelerated aging, proven quality | HVC wins |
| 4. IR Retention | Reduced by half to ≥5 GΩ, increased leakage | Excellent long-term IR retention, more stable at HF/HV | HVC wins |
| 5. Encapsulation | Mandatory ≥3mm additional insulation layer | Superior anti-flashover, suitable for air/compact environments | HVC wins |
| 6. Ultra-HV Coverage | Max 20kV only, gaps at higher voltages | 10kV to 50kV continuous full coverage, no gaps | HVC wins |
| 7. 20kV Model Range | Only 3 N4700 models, limited selection | 6 complete capacitance gradient models, precise selection | HVC wins |
| 8. DC Bias Performance | >20% capacitance drop at HV, affects divider accuracy | <5% bias drift, high linearity, ensures precision sampling | HVC wins |
| 9. Supply Chain & Lead Time | Overseas distributor inventory dependent, long coordination | 4–6 weeks standard lead time, direct factory tech support | HVC wins |
| 10. Deep Customization | No customization of parameters, dimensions, or leads | Full customization: capacitance, voltage, form factor, special leads | HVC wins |
Evaluation Conclusion: Across the 10 critical dimensions benchmarked in this analysis, HVC demonstrates a significant technology generation advantage in 9 core technical and commercial dimensions, with 1 dimension showing comparable performance. For customers currently using SAMWHA HV ceramic capacitors, migrating to HVC not only resolves high-voltage coverage gaps and supply risk but represents a comprehensive technology upgrade in underlying product reliability, precision, and service life.
5. Key Model Quick Selection Replacement Guide
5.1 10kV N4700 Core Models
| SAMWHA P/N | Specification | HVC Recommended Replacement |
|---|
| ECN4A102K16DS1 | 10kV 1000pF N4700 | HVC-10KV-DL16-F10-102K |
| ECN4A471K12DS1 | 10kV 470pF N4700 | HVC-10KV-DL12-F10-471K |
| EKR4A102K17DS1 | 10kV 1000pF Y5R | HVC-10KV-DL16-F10-102K (recommended material upgrade) |
5.2 15kV N4700 Core Models
| SAMWHA P/N | Specification | HVC Recommended Replacement |
|---|
| ECN4C102K18DS2 | 15kV 1000pF N4700 | HVC-15KV-DL18-F12.5-102K |
| ECN4C471K15DS2 | 15kV 470pF N4700 | HVC-15KV-DL14-F10-471K |
| EKR4C102K20DS2 | 15kV 1000pF Y5R | HVC-15KV-DL18-F12.5-102K (recommended material upgrade) |
5.3 20kV N4700 Core Models
| SAMWHA P/N | Specification | HVC Recommended Replacement |
|---|
| ECN4D102K18DS3 | 20kV 1000pF N4700 | HVC-20KV-DL21-F12.5-102K |
| ECN4D101K08DS3 | 20kV 100pF N4700 | HVC-20KV-DL08-F10-101K |
5.4 10kV General Dielectric Series (Y5P / Y5U / Y5V / SL)
| SAMWHA P/N | Specification | HVC Recommended Replacement |
|---|
| EKB4A102K16DS1 | 10kV 1000pF Y5P | HVC-10KV-D16-F10-102K |
| EKE4A472M22DS1 | 10kV 4700pF Y5U | HVC-10KV-E22-F10-472M |
| EKF4A472M18DS1 | 10kV 4700pF Y5V | HVC-10KV-F18-F10-472M |
| ECO4A101K18DS1 | 10kV 100pF SL | HVC-10KV-SL18-F10-101K |
5.5 15kV General Dielectric Series (Y5P / Y5U / SL)
| SAMWHA P/N | Specification | HVC Recommended Replacement |
|---|
| EKB4C102K18DS2 | 15kV 1000pF Y5P | HVC-15KV-D18-F12.5-102K |
| EKE4C332M20DS2 | 15kV 3300pF Y5U | HVC-15KV-E20-F12.5-332M |
| ECO4C820K17DS2 | 15kV 82pF SL | HVC-15KV-SL17-F12.5-820K |
5.6 30kV–50kV Ultra-HV Exclusive Product Line (SAMWHA Gap Coverage)
| Target Specification | HVC Exclusive Replacement Model | Typical Application |
|---|
| 30kV 1000pF N4700 | HVC-30KV-DL28-F17.5-102K | Medical CT, grid voltage dividers |
| 40kV 1000pF N4700 | HVC-40KV-DL32-F20-102K | Industrial X-ray flaw detection, HV electrostatic generators |
| 50kV 1000pF N4700 | HVC-50KV-DL34-F18-102K | Ultra-HV testing instruments, aerospace laser equipment |
Disclaimer: SAMWHA is a registered trademark of its respective owner. Third-party data referenced herein is sourced from their publicly released official technical specifications. Comparison results are provided for R&D technical selection and procurement decision reference only.
