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High Voltage Ceramic Capacitor Expert
Do I need to redesign my PCB when switching to HVC capacitors?
In most cases, HVC's drop-in replacement capacitors require zero PCB redesign — our products are engineered to match the mechanical footprint, terminal configuration, and mounting hardware of major legacy brands (Vishay 715C, TDK UHV/FHV, Murata DHS, AVX HP/HW series). However, certain edge cases may require minor adjustments.
| Replacement Scenario | PCB Change Required? | Typical Action Needed |
|---------------------|---------------------|----------------------|
| Direct pin-compatible equivalent (same footprint) | ❌ No change | Drop-in replacement, reflow/solder as-is |
|---|---|---|
| Slightly different body diameter (±3mm) | ⚠️ Maybe | Verify clearance to adjacent components |
| Different terminal type (thread vs solder lug) | ⚠️ Maybe | Add threaded insert or change mounting hole |
| Higher voltage class (larger creepage needed) | ⚠️ Likely | Increase pad spacing or add isolation slot |
| Significantly different form factor | ✅ Yes | Layout revision required (rare for catalog parts) |
| Legacy Part | HVC Equivalent | Footprint Match | Notes |
|-------------|---------------|-----------------|-------|
| Vishay 715C20Pxxxxx (Ø38mm) | HVCT8G-20K-xxxx | Pin-compatible | Same Ø38mm, same M6 thread |
|---|---|---|---|
| TDK UHV-6A (Ø45mm) | HVCT8G-60K-xxxx | Pin-compatible | Same Ø45mm, same M8 thread |
| Murata DHS series (Ø25mm) | HVCT8G-15K-xxxxS | Pin-compatible | Same Ø25mm, M5 thread |
| AVX HP80 series (Ø50mm) | HVCT8G-80K-xxxxD | Pin-compatible | Same Ø50mm, M10 thread |
| SAMWHA HVD series (various) | HVCT8G matching | Pin-compatible | Direct dimensional match |
Adjustment #1: Creepage/Clearance Gap
If upgrading to a higher voltage rating, verify IEC 60664 creepage distances:
| Voltage Class | Min Creepage (Pollution Degree 2) | Min Clearance |
|--------------|----------------------------------|---------------|
| Up to 20kV | 25mm | 16mm |
| 20kV – 40kV | 40mm | 28mm |
| 40kV – 80kV | 63mm | 45mm |
| Above 80kV | Per calculation | Per calculation |
Adjustment #2: Terminal Torque Specification
Ensure PCB mounting hardware can handle HVC's recommended torque:
| Thread Size | Recommended Torque | Tool |
|-------------|-------------------|------|
| M5 | 1.5 – 2.0 Nm | Hex socket driver |
| M6 | 2.5 – 3.5 Nm | Hex socket driver |
| M8 | 4.0 – 6.0 Nm | Torque wrench recommended |
| M10 | 8.0 – 12.0 Nm | Torque wrench required |
Adjustment #3: Thermal Relief Pad
For high-current applications, ensure adequate copper area around terminals:
* Minimum: 10mm × 10mm solid copper per terminal
* Recommended: Connected to internal ground plane for heat spreading
* Best practice: Additional thermal vias under mounting pads for multi-layer boards
Contact: Sales Department
Phone: +86 13689553728
Tel: +86-755-61167757
Email: sales@hv-caps.com
Add: 9B2, TianXiang Building, Tianan Cyber Park , Futian, Shenzhen, P. R. C
