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

PCB redesign capacitor replacement, pin compatible HV capacitor, footprint mapping, creepage clearance requirement, drop-in replacement no layout change

URL Slug

pcb-redesign-needed-hvc-capacitor-replacement

Schema_JSON

{ "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{ "@type": "Question", "name": "Do I need to redesign PCB when switching to HVC capacitors?", "acceptedAnswer": { "@type": "Answer", "text": "Most cases ZERO PCB redesign — pin-compatible footprints: Vishay 715C(Ø38/M6)→HVCT8G pin-compat, TDK UHV(Ø45/M8)→pin-compat, Murata DHS(Ø25/M5)→pin-compat, AVX HP80(Ø50/M10)→pin-compat. Edge cases needing adjustment: higher voltage(verify IEC 60664 creepage: 20kV=25mm/16mm, 40kV=40mm/28mm, 80kV=63mm/45mm), different terminal type(add insert/threaded hole). Minor adjustments: torque(M5=1.5-2Nm, M6=2.5-3.5Nm, M8=4-6Nm, M10=8-12Nm), thermal relief pad(min 10×10mm Cu)." } }] }

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