Abstract

As the demand for supply chain diversification in electronic components grows, HVC's high-voltage bolt terminal ceramic capacitors are becoming the preferred alternative to TDK's UHV/FHV/FD series. This document compiles 12 key engineering questions covering electrical compatibility, performance benchmarking, and supply chain strategy. All data is based on laboratory measurements and industry application experience, helping R&D engineers and procurement managers achieve risk-free alternative sourcing.

1. Electrical & Mechanical Compatibility

Q1: Can HVC HV ceramic capacitors directly replace TDK UHV/FHV series electrically?

A: Yes, fully compatible.

The HVC HVCT8G series was designed from the outset to strictly align with TDK UHV/FHV/FD key parameters:

• Voltage Coverage: HVC standard products cover 10KV to 150KV, fully encompassing TDK's 20KV-50KV range.
• Capacitance Matching: Every TDK model has a corresponding HVC replacement (see selection table below) with 1:1 capacitance values.
• Key Specification Upgrade: HVC uses N4700 Class 1 ceramic in place of TDK's Y5S/Z5T Class 2, improving D.F., temperature stability, and insulation resistance.

Q2: Are there dimensional differences? Can it be a true drop-in replacement?

A: HVC achieves true pin-to-pin compatibility.

• Example: HVC HVCT8G-30KV-DL40-941K and TDK UHV-4A (30KV 940pF) share identical 40mm diameter and M6 screw terminal spacing.
• Mounting Compatibility: Bolt spacing, mounting height, and terminal specifications are fully identical — no bracket modification required.
• Improvement: HVC's optimized copper electrode process offers better electrochemical corrosion resistance in high-voltage environments.

Q3: Can HVC replace TDK's AC-rated series (FD/TSF)?

A: Yes, HVC offers dedicated AC-rated models.

The HVC HVCT8G series includes AC voltage-rated models, e.g. HVCT8G-10KVAC-DL30-101K directly replaces TDK FD-9A (10KVAC, 100pF). All AC models pass dielectric strength and insulation testing, suitable for AC coupling and filter applications.

2. Performance Benchmarking

Q4: What advantages does N4700 have over TDK's Y5S?

A: N4700 outperforms Y5S in environmental compliance, stability, and insulation.

• Lead-Free: N4700 contains no lead, no RoHS exemption needed.
• Lower D.F.: N4700 dissipation factor is below 0.002, generating less heat under high-frequency pulses.
• Higher IR: N4700 volume resistivity is over 10x that of Y5S, minimizing leakage current under HV.
• Temperature Stability: N4700 capacitance variation from -55℃ to +125℃ is far smaller than Y5S/Z5T.

Q5: What advantages do copper electrodes have over TDK's silver electrodes?

A: Copper electrodes offer significantly better migration resistance and current handling.

• Silver Migration Resistance: Silver ions migrate along ceramic surfaces under high electric fields, forming conductive paths. Copper ions migrate at only 1/100 the rate of silver, fundamentally eliminating this failure mode.
• Surge Withstand: Copper's higher melting point and conductivity vs. silver enables greater surge current handling capability.

Q6: How reliable is HVC's dual-chip structure?

A: The dual-chip structure has undergone rigorous voltage balancing design and verification.

HVC incorporates a dedicated voltage-balancing buffer layer between the two chips in series configuration, ensuring uniform voltage distribution. After 1000-hour high-temperature aging and 100 temperature cycles, dual-chip products demonstrate excellent capacitance stability and insulation resistance, with reliability equivalent to single-chip designs.

3. Complete Series Quick Selection Guide

The following tables cover all standard models across TDK's UHV, FHV, TSF and FD series — 53 models with corresponding HVC replacement models. HVC uses N4700 Class 1 ceramic (lead-free, lower dissipation factor) to upgrade TDK's original Y5S/Z5T/Y5P Class 2 materials.

TSF & FD Series (AC Rated)

TDK Model	Spec (Voltage/Cap)	TDK Material	HVC Replacement	HVC Material (Upgrade)
TSF-40C	20KVAC, 1080pF	Z5T	HVCT8G-20KVAC-DL40-1081K	N4700
TSF-30	20KVAC, 400pF	Z5T	HVCT8G-20KVAC-DL30-401K	N4700
FD-9A	10KVAC, 100pF	Y5P	HVCT8G-10KVAC-DL30-101K	N4700
FD-10A / FD-10AU	10KVAC, 250pF	Y5P	HVCT8G-10KVAC-DL30-251K	N4700
FD-11A / FD-11AU	10KVAC, 500pF	Y5P	HVCT8G-10KVAC-DL30-501K	N4700
FD-12A / FD-12AU	10KVAC, 1000pF	Y5P	HVCT8G-10KVAC-DL40-102K	N4700
FD-16A / FD-16AU	13KVAC, 250pF	Y5P	HVCT8G-13KVAC-DL30-251K	N4700
FD-18A / FD-18AU	13KVAC, 500pF	Y5P	HVCT8G-13KVAC-DL30-501K	N4700
FD-20A	13KVAC, 1000pF	Y5P	HVCT8G-13KVAC-DL50-102K	N4700
FD-22A	20KVAC, 250pF	Y5P	HVCT8G-20KVAC-DL30-251K	N4700
FD-24A	20KVAC, 500pF	Y5P	HVCT8G-20KVAC-DL40-501K	N4700
FD-33A	25KVAC, 250pF	Y5P	HVCT8G-25KVAC-DL30-251K	N4700
FD-36A	25KVAC, 500pF	Y5P	HVCT8G-25KVAC-DL50-501K	N4700

FHV Series (DC Molded)

TDK Model	Spec (Voltage/Cap)	TDK Material	HVC Replacement	HVC Material (Upgrade)
FHV-153AN	15KVDC, 7000pF	Y5S	HVCT8G-15KV-DL60-702K	N4700
FHV-1AN	20KVDC, 1700pF	Y5S	HVCT8G-20KV-DL40-172K	N4700
FHV-2AN	20KVDC, 3000pF	Y5S	HVCT8G-20KV-DL50-302K	N4700
FHV-3AN	20KVDC, 5200pF	Y5S	HVCT8G-20KV-DL60-522K	N4700
FHV-4AN	30KVDC, 1200pF	Y5S	HVCT8G-30KV-DL40-122K	N4700
FHV-5AN	30KVDC, 2100pF	Y5S	HVCT8G-30KV-DL50-212K	N4700
FHV-6AN	30KVDC, 3500pF	Y5S	HVCT8G-30KV-DL60-352K	N4700
FHV-7AN	40KVDC, 850pF	Y5S	HVCT8G-40KV-DL40-851K	N4700
FHV-8AN	40KVDC, 1500pF	Y5S	HVCT8G-40KV-DL50-152K	N4700
FHV-9AN	40KVDC, 2600pF	Y5S	HVCT8G-40KV-DL60-262K	N4700
FHV-10AN	50KVDC, 700pF	Y5S	HVCT8G-50KV-DL40-701K	N4700
FHV-11AN	50KVDC, 1300pF	Y5S	HVCT8G-50KV-DL50-132K	N4700
FHV-12AN	50KVDC, 2100pF	Y5S	HVCT8G-50KV-DL60-212K	N4700

UHV Series (Ultra-High Voltage Bolt Terminal)

TDK Model	Spec (Voltage/Cap)	TDK Material	HVC Replacement	HVC Material (Upgrade)
20KV Grade
UHV-221A	20KVDC, 200pF	Z5T	HVCT8G-20KV-DL30-201K	N4700
UHV-222A	20KVDC, 400pF	Z5T	HVCT8G-20KV-DL30-401K	N4700
UHV-223A	20KVDC, 700pF	Z5T	HVCT8G-20KV-DL30-701K	N4700
UHV-224A	20KVDC, 1000pF	Z5T	HVCT8G-20KV-DL30-102K	N4700
UHV-1A	20KVDC, 1400pF	Z5T	HVCT8G-20KV-DL40-142K	N4700
UHV-2A	20KVDC, 2500pF	Z5T	HVCT8G-20KV-DL50-252K	N4700
UHV-3A	20KVDC, 4000pF	Z5T	HVCT8G-20KV-DL60-402K	N4700
30KV Grade
UHV-231A	30KVDC, 200pF	Z5T	HVCT8G-30KV-DL30-201K	N4700
UHV-232A	30KVDC, 400pF	Z5T	HVCT8G-30KV-DL30-401K	N4700
UHV-233A	30KVDC, 700pF	Z5T	HVCT8G-30KV-DL30-701K	N4700
UHV-4A	30KVDC, 940pF	Z5T	HVCT8G-30KV-DL40-941K	N4700
UHV-5A	30KVDC, 1700pF	Z5T	HVCT8G-30KV-DL50-172K	N4700
UHV-6A	30KVDC, 2700pF	Z5T	HVCT8G-30KV-DL60-272K	N4700
40KV Grade
UHV-241A	40KVDC, 100pF	Z5T	HVCT8G-40KV-DL30-101K	N4700
UHV-242A	40KVDC, 200pF	Z5T	HVCT8G-40KV-DL30-201K	N4700
UHV-243A	40KVDC, 400pF	Z5T	HVCT8G-40KV-DL30-401K	N4700
UHV-7A	40KVDC, 700pF	Z5T	HVCT8G-40KV-DL40-701K	N4700
UHV-8A	40KVDC, 1300pF	Z5T	HVCT8G-40KV-DL50-132K	N4700
UHV-9A	40KVDC, 2000pF	Z5T	HVCT8G-40KV-DL60-202K	N4700
50KV Grade
UHV-251A	50KVDC, 100pF	Z5T	HVCT8G-50KV-DL30-101K	N4700
UHV-252A	50KVDC, 200pF	Z5T	HVCT8G-50KV-DL30-201K	N4700
UHV-253A	50KVDC, 400pF	Z5T	HVCT8G-50KV-DL40-401K	N4700
UHV-10A	50KVDC, 560pF	Z5T	HVCT8G-50KV-DL40-561K	N4700
UHV-11A	50KVDC, 1000pF	Z5T	HVCT8G-50KV-DL50-102K	N4700
UHV-12A	50KVDC, 1700pF	Z5T	HVCT8G-50KV-DL60-172K	N4700

4. HVC HVCT8G Part Number Decoder

HVCT8G-[Voltage]-[Size Code]-[Capacitance Code]

Field	Meaning	Example
HVCT8G	Doorknob capacitor series prefix	HVCT8G-20KV-DL30-201K
Voltage	DC or AC voltage	20KV, 30KV, 10KVAC
DL30-60	Diameter code	DL40 = 40mm
Capacitance Code	201=200pF, 102=1000pF, 702=7000pF	941K
K	Tolerance ±10%	K

5. Typical Replacement Cases

TDK P/N	HVC Replacement	Key Technology Upgrade
UHV-4A 30KV 940pF	HVCT8G-30KV-DL40-941K	Z5T→N4700, silver electrode→copper electrode
FHV-3AN 20KV 5200pF	HVCT8G-20KV-DL60-522K	Leaded Y5S→lead-free N4700
FD-12A 10KVAC 1000pF	HVCT8G-10KVAC-DL40-102K	Y5P→N4700, more stable at AC HF

6. Supply Chain & Procurement Strategy

Q7: What are the MOQ and lead time?

A: HVC offers more flexible supply terms than TDK.

• MOQ: HVC requires only 50 pcs minimum (TDK typically 100 pcs), significantly lowering trial-run thresholds.
• Samples: Free engineering samples available during R&D phase (from 5 pcs).
• Lead Time: Standard lead time 4-6 weeks across all models; urgent orders compressible to 2 weeks.

Q8: Does HVC have experience replacing Murata's discontinued models?

A: Yes. HVC is one of the most experienced domestic manufacturers in this regard.

Since Murata discontinued HV bolt capacitors in 2018, HVC has provided dozens of former Murata customers with 1:1 dimension, same N4700 material precision replacements. In contrast to TDK's approach of using Y5S to replace Murata's N4700 — which introduced material mismatches — HVC's replacement is more precise, requiring no circuit design changes.

7. Quality Certification & Industry Compliance

Q9: Are the products suitable for medical/industrial equipment?

A: Fully compliant.

• Medical Compliance: Products are successfully used in GE Healthcare's CT and X-ray systems, among other medical equipment.
• Industrial Compliance: Fully RoHS and REACH compliant; N4700 material is lead-free throughout.

Q10: What are the quality control features?

A: Rigorously follows industrial standards.

• 100% Testing: Every unit undergoes dielectric strength and insulation resistance testing.
• Standards: Testing methods follow IEC 60384 (fixed capacitor general specification).
• Traceability: Production batches traceable to raw material level.

8. Application Selection Guide

Q11: How to select for medical CT/X-ray power supplies?

A: Recommend UHV series cross-reference models.

Medical equipment demands the highest HV capacitor standards. HVC HVCT8G series N4700 products are recommended — their low D.F. and long-term stability fully satisfy medical imaging requirements. HVC has volume shipment validation from GE Healthcare and other medical customers.

Q12: What if I need capacitors exceeding TDK's 50KV ceiling?

A: HVC offers 80KV/100KV/150KV ultra-high voltage products.

For scientific instruments, laser power supplies, and other ultra-high-voltage applications, HVC's dual-chip series structure provides standard 80KV, 100KV, and 150KV bolt terminal ceramic capacitors. For example, while TDK UHV-9A only handles 40KV 2000pF, HVC can provide a single 100KV 1000pF replacement — one capacitor replacing three TDK parts in series.

9. Series Cross Reference Guide

TDK Series	HVC Series	Replacement Features	Typical Applications
UHV Series (20-50KV)	HVCT8G Series	N4700 material upgrade, copper electrode, screw terminal	Medical CT, HV power supplies, X-ray
FHV Series (15-50KV molded)	HVCT8G Series	Lead-free, 700-7000pF coverage	Power transformers, laser power supplies
FD/TSF Series (AC rated)	HVCT8G-AC Series	AC-rated, N4700 better HF	AC filters, power electronics

Contact HVC Technical Team

For the HVCT8G series full datasheet, sample requests, or cross-reference assistance:

© HVC Capacitor Manufacturing Co., Ltd. TDK® is a registered trademark of TDK Corporation. This document is for technical comparison purposes only and does not imply affiliation with or endorsement by the trademark holder.