Supply chain · mechanical cross-reference · customer qualification

Executive Summary

High-voltage thick-film resistors are critical in medical imaging (X-ray/CT), precision HV power supplies, and analytical / physics equipment. Supply continuity and predictable lead times matter as much as electrical performance. METALLUX AG is widely used in this class with the HVR Series (967/968/969). Where procurement is concentrated on a single qualified vendor, teams often see long factory lead times, limited flexibility on specials, and pressure on total cost—especially when capacity or allocation tightens.

HVC offers an HVR line intended for form-fit-function evaluation against METALLUX footprints: 96% alumina substrates, ruthenium oxide (RuO₂)-based films, serpentine low-inductance layout, and laser trimming for value and ratio control. Mechanical dimensions are aligned for pin-to-pin review; electrical advantages (e.g. VCR behaviour, pulse handling) must be confirmed under your test plan and operating conditions. This note summarises public cross-references and supply parameters so you can run a structured qualification alongside your existing METALLUX-approved parts.

1. Technical Background and Industry Challenges

1.1 Criticality and Technical Thresholds of High Voltage Thick Film Resistors

High voltage thick film resistors differ from ordinary consumer-grade resistors; they must maintain long-term stability under extremely high voltage gradients (up to 10kV/mm).

• Application Scenarios: X-ray machine anode protection, high voltage divider sampling, particle accelerator discharge, etc.
• Core Pain Points: Under high voltage loads, ordinary resistors are prone to voltage coefficient (VCR) drift, partial discharge, or even film thermal breakdown. Any failure can lead to damage to expensive main equipment (such as X-ray tubes).

1.2 Systemic Risks of Single Supplier Dependence

The METALLUX HVR lines are established references for precision and stability. Relying on a single qualified source can still create operational exposure:

• Lead times: Reported standard lead times are often in the 20–30 week range; allocation or factory events can extend schedules further.
• Custom values and mechanical specials: HV designs may need non-E24 values (e.g. 123 MΩ) or specific lead forming. MOQs and response times for specials may limit NPI and field service.
• Total cost of ownership: Brand positioning, currency, and distributor tiers can keep BOM cost elevated relative to multi-source strategies.

2. HVC's Approach: Engineering-Led Alternative, Not a Generic Look-Alike

HVC develops HV thick-film parts using processes proven in high-voltage component manufacturing (including UHV-class insulation experience). The goal is a documented, repeatable path for customers who need a second source or lifecycle extension for METALLUX-class boards—not a cosmetic substitute.

2.1 Design Building Blocks of the HVC HVR Series

The HVC HVR range (flat HVRGXP / HVRGFP and tubular HVR-BSP / HVR-PFS) is built around:

• Substrate: 96% high-purity alumina (Al₂O₃) as the baseline ceramic (compare to typical legacy grades in the ~85–90% range—always verify against the latest METALLUX datasheet for your exact part).
• Low-inductance pattern: Optimised serpentine geometry to keep parasitic inductance in the microhenry (µH) class where pulse edges matter.
• Film system: Ruthenium oxide (RuO₂)-based films with target VCR in the < 1–5 ppm/V band (grade- and geometry-dependent); validate on your divider or sense node.

2.2 Mechanical Cross-Reference: HVC HVR vs METALLUX HVR

The tables below map METALLUX’s three mechanical families to HVC series for layout-level review. Electrical equivalence is not implied beyond what your qualification tests show.

2.2.1 Planar — METALLUX HVR 967 → HVC HVRGXP / HVRGFP

Full replacement hub (figures may update): METALLUX HVR series — HVC cross-reference.

Dimensions: A(L)=length, B=width, C=pin spacing, d=lead diameter.

2.2.2 Tubular (precision) — METALLUX HVR 968 → HVC HVR-BSP

A = body length, B = outer diameter, d = lead diameter.

2.2.3 Tubular (high power) — METALLUX HVR 969 → HVC HVR-PFS

L = body length, B = flange spacing, ø = body OD, D = mounting hole, G = thread.

3. Supply Chain and Commercial Factors

A qualified second source is as much a business process decision as a datasheet exercise.

3.1 Manufacturing Flexibility and Lead Time

As a manufacturer, HVC targets responsive scheduling for HV resistor lines (subject to order mix and material availability):

• Typical lead time: about 4–6 weeks for standard builds; expedited slots may be available on request (confirm at order entry).
• Custom values: Laser trimming supports standard and non-standard values (e.g. 123 MΩ); MOQs are project-dependent—ask for your specific value and package.

3.2 Cost and Technical Support

• Pricing: Many cross-cases show roughly 30–40% lower unit cost than premium European references for comparable ratings—request a formal quote for your exact PN and annual volume.
• Engineering support: Selection help, sample evaluation, and failure analysis are handled by HVC factory engineers, not only catalogue distribution.

4. Conclusion: Qualify a Second Source on Your Terms

Where METALLUX lead times or allocation constrain your programme, HVC HVR is a practical candidate for parallel qualification: comparable ceramic and film strategy, documented mechanical maps, and shorter typical factory cycles. Final approval remains with your design, quality, and safety process—samples and datasheets should be reviewed against your application limits.

Recommended next step: request samples for your target METALLUX PN, run your standard incoming and system-level tests, and add HVC under your AVL once results meet your gates.

5. METALLUX Part Number Quick Reference

HVR / HPR / HVI family listing (64 types, indicative—confirm against METALLUX documentation):

6. HVC Part Numbering System

HVR-[Series]-[Size]-[Resistance]-[Tolerance]-[TCR]-[Voltage]

Ordering Example: Replace HVR967.3.25 → HVR-GXP4.25-10M-F-25-12kV

7. Contact and Technical Support

If you are looking for replacements for discontinued METALLUX series, or have any requirements for high voltage resistor selection or customization, HVC's replacement engineering team is ready to assist you.

We provide sample support and factory-level technical assistance for qualification programmes. Any use of competitor trademarks herein is for compatibility identification only.

Copyright Notice: This document is owned by HVC Capacitor. Reproduction or use for commercial purposes without permission is prohibited.
Disclaimer: Parameters are indicative for selection; binding values are on the current HVC datasheet and your purchase order. Final fit for purpose—including electrical, mechanical, and safety compliance—is the customer’s responsibility. METALLUX and related type codes are trademarks of their owners; use here is for technical cross-reference only.