Supply Chain Resilience Upgrade: The Strategic Case for HVC vs. TDK

Executive Summary

In the core design of high-voltage electronic systems, component supply chain security has become as important as electrical performance. Since Murata announced the discontinuation of HV bolt terminal capacitors in 2018, the Chinese market has become heavily dependent on TDK — but recent geopolitical volatility has exposed the fragility of a single-source strategy.

This paper examines how HVC, through N4700 Class 1 ceramic material, copper electrode technology, and flexible supply chain management, provides a drop-in replacement solution for medical imaging, industrial power electronics, and scientific testing industries while achieving cost optimization and lead time reduction.

1. Market Background: The "Double Challenge" of HV Ceramic Capacitors

1.1 Technical Threshold: Hard Requirements for HV Capacitors

HV bolt terminal ceramic capacitors are critical passive components in CT scanners, X-ray generators, power transformers, and laser power supplies. Unlike ordinary capacitors, they must maintain absolute physical and chemical stability under tens of thousands of volts:

• Zero Flashover Reliability: No surface flashover or internal partial discharge under tens of KV.
• Ultra-Low Dissipation Factor: D.F. must be below 0.002, otherwise self-heating under high-frequency pulses leads to thermal runaway.
• Long-Term Stability: Capacitance drift and IR degradation under sustained HV bias must stay within allowable limits.

1.2 Supply Chain Crisis: Dual Risk from Murata's Exit and TDK Dependency

The HV bolt ceramic capacitor market has experienced two major shocks:

• First Wave (2018): Murata discontinued HV bolt capacitors, forcing many customers to find alternatives. TDK picked up some market share, but its replacements were not precise — for example, using a 15KV 7000pF Y5S capacitor to replace Murata's 15KV 5300pF N4700, with mismatched capacitance and material.
• Second Wave (2025-Present): Geopolitical tensions between China and Japan have raised widespread concerns about supply chain security for Japanese components. TDK standard lead times have stretched to 12-16 weeks, with custom products requiring 20-24 weeks, severely constraining production ramp-up.

HVC's Mission: To help customers regain supply chain control by providing electrically matched, physically compatible replacement alternatives.

2. Technical Deep-Dive: Why HVC Is Up to the Task

HVC is not just manufacturing ceramic capacitors — it has achieved technology breakthroughs in materials science on par with international standards.

2.1 Core Materials: N4700 Class 1 Ceramic + Copper Electrode

HVC has moved beyond the Y5S/Z5T Class 2 ceramic system, adopting N4700 Class 1 ceramic throughout with copper electrode plating:

• Lead-Free & Eco-Friendly: N4700 contains no lead, no RoHS exemption required, meeting ever-stricter global environmental regulations.
• Microstructural Advantage: The highly dense N4700 crystal structure formed during sintering physically blocks silver ion migration paths, ensuring long-term insulation reliability under HV.
• Copper Electrode Durability: Copper electrodes demonstrate significantly better corrosion resistance than silver in high-temperature, high-humidity environments, extending capacitor service life in harsh conditions.

2.2 Dual-Chip Structure Breaks Physical Limits

• Series Design: For 80KV, 100KV, 150KV ultra-high voltage products, far beyond TDK's 50KV ceiling.
• Parallel Design: Achieves 5000pF, 8000pF high capacitance values within the N4700 material system.

2.3 Key Performance Data

Key Metric	Industry Standard	HVC Performance	Application Value
Voltage Range	20-50KV	10-150KV	Covers broader HV application needs
Max Capacitance (at 50KV)	2100pF	8000pF	One part replaces multiple, reduces component count
Lead Compliance	Y5S contains lead	Lead-free (N4700)	Avoids RoHS exemption expiration risk
1000h Life Drift	±10%	< ±5%	Decade-long life, lower maintenance costs

3. TDK UHV/FHV/FD/TSF Complete Series Replacement Cross Reference

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	Operating voltage	20KV, 30KV, 50KV, 20KVAC
DL30-60	Body diameter code	DL40 = 40mm diameter
Capacitance Code	Capacitance encoding	201K = 200pF, 102K = 1000pF

Ordering Example: Replace TDK FHV-3AN 20KV 5200pF → HVCT8G-20KV-DL60-522K

5. Solution Portfolio: From "Replacement" to "Upgrade"

5.1 Direct Replacement

For TDK's UHV/FHV/FD product lines, HVC offers fully dimensionally compatible screw terminal models — no bracket modification required.

TDK Series	HVC Series	Typical Applications	Replacement Advantage
UHV Series (20-50KV)	HVCT8G Series	HV power supplies, medical CT	N4700 material upgrade, copper electrode
FHV Series (15-50KV molded)	HVCT8G Series	Power transformers, X-ray	Lead-free, wider capacitance range
FD/TSF Series (AC rated)	HVCT8G Series	AC filters, power electronics	N4700 superior HF performance

5.2 Supply Chain Value-Added Services

• Fast Delivery: Standard products in stock with 4-6 week lead time (TDK: 12-16 weeks).
• Cost Optimization: Through efficient process management, HVC typically saves customers 20%-50% on BOM costs.
• Agile Customization: Fast prototyping for non-standard capacitance, special voltage, and mounting configurations (48-hour response).
• One-Replaces-Many: Leveraging HVC's higher voltage/capacitance ratings, a single part can replace multiple TDK series/parallel configurations, simplifying PCB layout.

6. Market Track Record & Customer Recognition

HVC has achieved volume shipment qualification from globally recognized companies:

• Nikon / Konica Minolta
• GE Healthcare
• Johnson & Johnson
• Baker Hughes

Following Murata's discontinuation, HVC has successfully provided dozens of customers with 1:1 dimension, same N4700 material precision replacement solutions, making it one of the most experienced domestic HV ceramic capacitor replacement manufacturers in the industry.

7. Quality Control & Certification

• Full-Process Testing: Every capacitor undergoes 100% dielectric strength and insulation resistance testing before shipment.
• Compliance: Fully RoHS/REACH compliant; N4700 material requires no lead exemption.
• Industry Standards: Design and testing follow IEC 60384, ensuring reliability under the harshest operating conditions.

8. Conclusion: Building a Win-Win Supply Chain Partnership

Choosing HVC does not mean lowering standards — it means higher supply chain security and a more competitive cost structure.

For engineers and procurement managers suffering from TDK lead-time challenges or seeking BOM cost optimization, HVC offers not just a ceramic capacitor, but a complete HV ceramic capacitor localization and performance upgrade solution.

Start Your Replacement Evaluation

For free samples and technical evaluation support, contact the HVC technical team.

© 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.