Abstract: This FAQ-style document systematically addresses common engineering questions about replacing SAMWHA ECN/EKB/EKE/EKF/ECO/EKR series high voltage ceramic capacitors with HVC equivalents. Covers material matching, mechanical compatibility, electrical parameter upgrades, 30kV+ ultra-high voltage coverage, and provides quick-reference cross tables.

Basics: Replacement Feasibility

Q1: Can HVC directly replace SAMWHA ECN series N4700 capacitors in-situ?

A: Yes. But note this is not just a 1:1 swap — it’s a technology upgrade. SAMWHA’s N4700 (ECN series) has DF=1.0%, actually doped Class 2 ceramic masquerading as N4700. HVC’s DL series uses genuine N4700 paraelectric ceramic with DF ≤ 0.2%. Regarding physical dimensions, HVC equivalents are typically smaller or equal in size. The only exception is 10kV/680pF N4700 (ECN4A681K13DS1, 13.5mm dia), where HVC replacement is HVC-10KV-DL15-F10-681K (15mm dia) — about 1.5mm larger but still within acceptable range.

Q2: How should SAMWHA Y5R (EKR series) be replaced?

A: Y5R is a Class 2 material between Y5P and Y5U. HVC uniformly upgrades it to genuine N4700 (DL series). This is a significant material upgrade, not a downgrade. For example, 10kV/1000pF Y5R (EKR4A102K17DS1, 17.5mm dia) is replaced by HVC-10KV-DL16-F10-102K (16mm dia) — actually smaller. Upgrade benefits: DF loss from ≤2.5% to ≤0.2%; DC Bias drift from 15-25% to <5%; virtually no self-heating at high frequencies.

Q3: Is there a direct equivalent for SAMWHA Y5P (EKB series)?

A: Yes. HVC’s Y5T (code D) is equivalent to SAMWHA’s Y5P as Class 2 materials. Direct replacement is available for all SAMWHA Y5P models.

Q4: Can HVC replace SAMWHA 20kV grade capacitors?

A: Not only can it replace — this is HVC’s core strike zone. SAMWHA’s 20kV grade (4D code) has three critical flaws: only 3 N4700 models (100pF, 1000pF, 2200pF) with 150pF~470pF completely missing; voltage withstand tested at only 130% rated voltage (all other grades are 150%); life test at only 110% rated voltage. HVC covers a complete 6-step capacitance gradient for 20kV N4700, all with 150% withstand testing.

Technical: Electrical & Mechanical Performance

Q5: Are PCB mounting holes fully compatible? Do I need to redesign?

A: The vast majority of models require no modification. HVC replacement lead pitches (F10=10mm, F12.5=12.5mm, F15=15mm) are identical to SAMWHA originals, with compatible hole sizes. Some models are even smaller in diameter, providing extra PCB space margin. 30kV+ grades are completely new territory where SAMWHA has no products.

Q6: Can HVC’s N4700 truly handle high-frequency pulses without heating?

A: Yes. Genuine N4700 is a Class 1 paraelectric ceramic with extremely low dielectric loss (DF ≤ 0.2%), making self-heating negligible under high frequencies. In contrast, SAMWHA’s fake N4700 (DF=1.0%) self-heats severely under high-frequency pulse current — their own datasheet warns that >10°C temperature rise may cause internal solder melting or ceramic cracking. HVC’s genuine N4700 has none of these issues.

Quick Cross Reference Tables

15kV Popular Selections

20kV Popular Selections

20kV N4700 Mid-Capacitance: SAMWHA Missing → HVC Exclusive

30kV+ Ultra-HV: SAMWHA Missing → HVC Exclusive

Appendix: HVC Dielectric Code Quick Reference

Appendix: SAMWHA 5 Flaws vs HVC Upgrade

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