About Product Performance

Q1: What are the core differences between HVC diodes and SEMIKRON/SEMTECH?

HVC utilizes large chip technology, offering significant advantages in thermal performance. Specifically, the chip area is increased by 30% to 50%, reducing current density by approximately 29%; forward voltage drop is reduced by 5% to 8%, leading to a corresponding decrease in power loss; thermal resistance is optimized by 15% to 20%, improving heat dissipation efficiency. Actual test results show that, under the same operating current and voltage, HVC products have a junction temperature approximately 20°C lower than SEMIKRON.

Taking the comparison test between SK 6/16 and HVD-SK 6/16 as an example: under an operating current of 6A, operating voltage of 1.6kV, and ambient temperature of 25°C, the SEMIKRON junction temperature was 110°C, while the HVC junction temperature was 90°C, a temperature difference of 20°C.

Q2: Why is a 20°C lower temperature so important?

According to the relationship between semiconductor device lifetime and temperature, for every 10°C reduction in junction temperature, the device lifetime approximately doubles. A 20°C temperature advantage brings four practical values: * Increased reliability: Theoretical lifetime is extended by approximately 4 times. * Reduced heat sink size: Heat sinks can be reduced by 30% to 40%, lowering cost and volume. * Enhanced environmental adaptability: Can operate at higher ambient temperatures. * Expanded safety margin: Failure rate is reduced by 20% to 30%.

A real customer case showed that the original SEMIKRON SK 6/16 reached a junction temperature of 135°C in summer at an ambient temperature of 50°C, triggering overheat protection; after switching to HVC, the junction temperature dropped to 115°C, completely resolving the issue.

Q3: Are HVC's electrical parameters completely consistent with SEMIKRON/SEMTECH?

Core parameters are completely equivalent, and some parameters are even better for HVC. * Completely equivalent parameters include reverse voltage rating, forward current, surge current, and reverse recovery time. * Superior HVC parameters include a 5% to 8% lower forward voltage drop, 15% to 20% lower thermal resistance, and 10% to 15% lower reverse leakage current.

Q4: How is HVC's large chip technology achieved?

Large chip technology is achieved through three key breakthroughs: * Raw material upgrade: Using larger silicon wafers, increasing chip area from 1.0cm² to 1.4cm², which increases cost by about 15% but significantly improves performance. * Process optimization: Optimizing the diffusion process to ensure large chip uniformity, improving the metallization process to reduce contact resistance, and enhancing edge passivation to increase breakdown voltage. * Packaging improvement: Optimizing chip-to-package interface materials and improving heat conduction path design to reduce thermal resistance.

From a physical principle perspective, current density equals current divided by chip area. For a traditional design, 6A divided by 1.0cm² equals 6A/cm²; for HVC design, 6A divided by 1.4cm² equals 4.3A/cm², reducing current density by 29%, leading to less heat generation and a 20°C lower temperature.

About Compatibility

Q5: Can HVC directly replace SEMIKRON/SEMTECH? Is PCB modification required?

Yes, it can be directly replaced without modifying the PCB or heat sink. HVC strictly adheres to industry standard package dimensions: * SK series: Case diameter 12.7mm, lead diameter 1.0mm, standard lead spacing, M4 mounting hole position – all completely consistent with SEMIKRON. * SCH series: Axial lead design, lead diameter 1.0mm, and overall dimensions are also 100% compatible. The verification method is to measure the dimensions of the original SEMIKRON diode, compare them with the HVC datasheet, and confirm 100% compatibility before direct replacement.

Q6: After switching to HVC, does the heat sink need to be redesigned?

No, but optimization is an option. * Option A: Keep the original heat sink. * Advantage: No modifications required. * Effect: Increased reliability, suitable for applications with high reliability requirements. * Option B: Reduce the heat sink size. * Advantage: Lower cost, reduced volume. * Reduction: Can be reduced by 30% to 40%, suitable for cost-sensitive and space-constrained applications.

Taking the original SEMIKRON design as an example: power loss 7.8W, heat sink thermal resistance 8°C/W, temperature rise 62.4°C, junction temperature 101.4°C. * HVC design keeping the heat sink: Power loss 7.2W, temperature rise 57.6°C, junction temperature 93.4°C, a temperature reduction of 8°C. * HVC design with a smaller heat sink: Thermal resistance 10°C/W, temperature rise 72°C, junction temperature 107.8°C, still 6°C higher than the original design but within the safe range.

Q7: Does HVC support parallel operation?

Yes, it supports parallel operation, but current sharing design needs attention. Parallel operation guidelines include: * Select products from the same batch: Ensure forward voltage drop consistency within ±3% to avoid uneven current distribution. * Series small resistors for current sharing: Connect a 0.1 to 0.5Ω resistor in series with each diode. Resistor power should be calculated as current squared multiplied by resistance. * Ensure uniform heat dissipation: All diodes should be mounted on the same heat sink with good contact and uniform temperature.

For example, if 12A current and 1.6kV voltage rating are required, two HVD-SK 6/16 can be connected in parallel, with each handling 6A. A current sharing resistor of 0.2Ω would be used, with resistor power of 7.2W (select a 10W rating) and a resistor voltage drop of 1.2V.

About Supply Chain

Q8: How much faster is HVC's lead time compared to SEMIKRON?

Standard models are 10 to 15 times faster. * SEMIKRON: Standard models 12 to 20 weeks, custom models 20 to 24 weeks, expedited orders 8 to 12 weeks. * SEMTECH: Standard models 8 to 16 weeks, custom models 16 to 20 weeks, expedited orders 6 to 10 weeks. * HVC: Standard models 1 week, custom models 4 weeks, expedited orders 3 days. The value of fast delivery lies in reducing inventory costs (from 20 weeks to 1 week, inventory reduced by 95%), improving response speed, and lowering the risk of stock-outs.

Q9: What is HVC's Minimum Order Quantity (MOQ)?

50 pieces, whereas SEMIKRON typically requires 100 to 500 pieces. Flexible ordering policies include: * Standard models: MOQ 50 pieces. * Custom models: MOQ 100 pieces. * Samples: Up to 5 pieces provided free of charge. This small-batch friendly policy is suitable for new product development, small-batch production, and spare parts for repairs.

Q10: What quality certifications does HVC provide?

A complete quality certification system includes: * Basic certifications: ISO9001 Quality Management System, ISO14001 Environmental Management System, RoHS lead-free environmental protection, REACH chemical substance management. * Product certifications: UL certification for some models, CE certification for some models, CQC certification for the Chinese market. * Medical applications: ISO13485 and FDA traceability documentation can be provided.

About Applications

Q11: What application scenarios are HVC suitable for?

HVC covers all application scenarios of SEMIKRON/SEMTECH. * Industrial applications: Motor drives, industrial power supplies, welding equipment, induction heating. * Medical applications: X-ray equipment, laser medical equipment, high-voltage power modules. * Scientific research applications: Mass spectrometers, electron microscopes, particle accelerators. * Environmental applications: Electrostatic precipitators, ozone generators, plasma equipment.

Q12: How can I verify if HVC is suitable for my application?

A three-step verification method is recommended:

1. Parameter comparison: Compare voltage, current, surge, and other parameters to confirm that HVC specifications meet requirements.

2. Sample testing: Request up to 5 free samples, test them in the actual circuit, and measure temperature, waveforms, efficiency, etc.

3. Reliability validation: Conduct high-temperature aging tests, temperature cycling tests, and small-batch trial production validation.

HVC provides free samples, technical datasheets, application notes, thermal simulation models, and technical support.

Q13: How much lower is HVC's price compared to SEMIKRON?

Bulk purchases save 20% to 30%. Specifically: * 100 pieces: SEMIKRON unit price $9.00, HVC $7.20 (20% savings). * 1000 pieces: SEMIKRON unit price $8.50, HVC $6.80 (20% savings). * 10000 pieces: SEMIKRON unit price $8.00, HVC $6.00 (25% savings).

Total Cost of Ownership (TCO) savings are even greater, including: * Purchasing cost reduction: 20% to 30% * Inventory cost reduction: 70% * Heat dissipation cost reduction: 20% * Failure cost reduction: 20% Overall savings: 30% to 40%.

About Technical Support

Q14: How can I get technical support from HVC?

Multi-channel technical support includes online resources and human support. * Online resources: Product datasheet PDF downloads, application notes, online selection tool for model cross-reference, thermal simulation models (SPICE models). * Human support: Technical inquiries sales@hv-caps.com, sample requests sales@hv-caps.com, bulk quotations sales@hv-caps.com, with a 48-hour response time. * Customization services: Custom specifications, heat sink design consultation, reliability testing support, on-site technical support for key accounts.

1. Use the online selection tool: Visit hvc-diodes.com/cross-reference, enter the SEMIKRON/SEMTECH model for automatic matching.

2. Send a model list: Email your model list to sourcing@hvc-diodes.com, and receive corresponding models and quotations within 48 hours.

3. Consult the complete model cross-reference table PDF: Manually search for the equivalent.

Complete Model Cross-Reference Table

SEMIKRON Series Cross-Reference

SEMTECH Series Cross-Reference