• Murata DHS/DHR discontinued — HV ceramic replacement: N4700, Pin-to-Pin footprints.

1. Executive Summary

For decades, Murata DHS (bolt/doorknob) and DHR (radial) HV ceramics set the bar for medical imaging (CT/X-ray), NDT, and precision HV supplies. Murata’s 2018 withdrawal of its HV ceramic line (about 2–50 kV) created a real supply gap.

OEMs need Pin-to-Pin electrical, mechanical, and long-term reliability. HVC specializes in HV passives: drop-in options for discontinued Murata types, with N4700 Class I dielectric, ratings to 100 kV, and data aligned to original datasheets.

1. Background: Why Murata Left, Why HVC

2.1 Why Murata exited

Murata shifted capacity to high-volume MLCCs (EV, 5G)—not because HV ceramics failed technically.

DHS/DHR are high-mix, smaller-lot: strontium-titanate dielectrics, vacuum epoxy, strict PD testing. That segment is where HVC invests.

2.2 HVC’s role

We do not compete in MLCCs; we focus on HV plug-in/bolt ceramics Murata no longer builds.

DHS (doorknob): about 20–50 kV, CT tanks, lasers. DHR (radial): about 3–15 kV, static/ion/flaw-detection gear.

1. Technical comparison

Short comparison vs. Murata datasheet figures and HVC production data.

3.1 Dielectric (N4700 / ZM)

Murata’s ZM is the industry N4700 Class I dielectric for HV, HF use.

• Murata ZM: DF ≤0.2% typ.; ΔC about ±30% (−20°C to +85°C); conservative self-heating under extreme HF pulses.
• HVC N4700: DF ≤0.1–0.2%; lower ESR in multipliers (20–100 kHz) → less self-heating (matters in oil-filled CT stacks). ΔC within ±5% over temperature—tighter than generic Y5T/Z5U references.

3.2 Voltage

Murata DHS peaked around 40–50 kV. For 60–100 kV (accelerators, Marx generators, grid), users often stacked parts—more bulk, harder qualification.

• HVC: production to 100 kV using internal series stacks in one ceramic body to spread field stress.
• Same volume: e.g. 60 mm body can reach higher margin than Murata without external series strings.

3.3 Mechanics (Pin-to-Pin)

Dimensions must match HV tanks and creepage.

• Doorknob: D 20–60 mm matched. Threads: M4/M5/M6 and UNF 10-32—no busbar redesign.
• Radial: pitch 7.5 / 9.5 / 10 / 12.5 mm; epoxy encapsulation UL94V-0, moisture-resistant.

3.4 PD & reliability

Partial discharge (PD) drives long-term failure in ceramics.

• HVC: X-ray + ultrasonic inspection on ceramic bodies. At 1.5× rated AC, PD < 5 pC—suitable for medical CT–class requirements.

1. Typical cross-reference

From Murata DHS/DHR datasheets and HVC verification.

4.1 DHS (bolt) — CT/X-ray multipliers

Used in ~80–140 kV generator stacks; critical for size and thread fit.

4.2 DHR (radial) — compact HV modules

Handheld and small sources; sensitive to pitch and epoxy.

Most Inquiry Alternative Items (EOL DHR / DHS)

Aligned with 164.html. Request datasheet, sample, or quote by HVC part number.

DHR Series Cross Reference

DHS Series Cross Reference

1. Quality Control & Market Validation

5.1 Qualification

• 100% PD — every N4700 unit.
• Pulse life — 100k cycles, ΔC <3% (X-ray–like stress).
• 85°C / 85% RH — epoxy insulation.

5.2 Field use

• Medical — HV for CT/X-ray: GE, Philips, Siemens and major OEMs.
• NDT — Nikon, Shimadzu supply chains.
• Research — ABB grid gear, university Marx banks; HVC to 100 kV.

1. Conclusion

Murata left DHS/DHR for MLCC strategy, not obsolescence. For HV plug-in ceramics, HVC is the specialist line.

• MLCCs — Murata remains the default.
• HV DHS/DHR — HVC: N4700, to 100 kV, Pin-to-Pin.

Murata PN index (excerpt)

Full grids: 164.html.

Disc type (sample)

Doorknob type (sample)

Contact & technical support

Disclaimer: Cross-references are for engineering evaluation; confirm ratings on the latest HVC datasheet.