A High-Performance Alternative to OHMITE Slim-Mox/Ultra-Mox Series

Technical Abstract

HVC's HVR Series high voltage thick film resistors utilize advanced ruthenium-based (RuO₂) conductive technology and 96% Al₂O₃ ceramic substrates, enabling a fully compatible replacement for OHMITE Slim-Mox, Ultra-Mox, Mini-Mox, and similar series products.

This product meets or exceeds industry standards in critical parameters such as Temperature Coefficient of Resistance (TCR ±15 ppm/°C), Voltage Coefficient of Resistance (VCR 0.1 ppm/V), and mechanical dimensions. Furthermore, HVC offers a rapid 4-week lead time, effectively addressing global supply chain bottlenecks.

1. Core Technical Specifications

1.1 Electrical Performance Parameters

• Temperature Coefficient of Resistance (TCR): ±15 ppm/°C, superior to the industry standard of ±50 ppm/°C
• Voltage Coefficient of Resistance (VCR): 0.1 ppm/V, ensuring resistance stability in high voltage applications
• Resistance Range: 100 kΩ - 4 GΩ, achieving ultra-high resistance with a single component
• Resistance Tolerance: ±1%, ±5% (standard), with customizable ±0.5% high-precision versions available
• Rated Power: 0.25W - 9W (depending on package size)
• Operating Voltage: 1.5kV - 60kV (continuous working voltage)

1.2 Materials and Process Technology

• Conductive Phase Material: Utilizes ruthenium oxide (RuO₂) as the conductive phase.

During the 850°C high-temperature sintering process, RuO₂ particles form a stable three-dimensional conductive network with the glass phase, ensuring long-term resistance stability.

According to thick film resistor technology research, RuO₂-based resistors exhibit excellent linearity characteristics within the temperature range of -55°C to +155°C.

• Substrate Material: 96% Al₂O₃ ceramic substrate, with purity up to 96%.

Dielectric strength of 15-20kV/mm, thermal conductivity of 20-30 W/(m·K), and a dielectric constant of approximately 9.0 (at 1 MHz), fulfilling the demands of high voltage applications.

• Dielectric Strength: 15-20kV/mm, meeting high voltage application requirements
• Thermal Conductivity: 20-30 W/(m·K), ensuring efficient heat dissipation
• Dielectric Constant: Approx. 9.0 (at 1 MHz)
• Dielectric Loss (tan δ): < 0.001
• Surface Roughness (Ra): < 0.4 μm, suitable for precision printing

2. Target Application Areas

2.1 Medical Imaging Equipment

High voltage power supply systems for X-ray and CT scanners place extremely stringent demands on resistors. HVC's HVR Series offers TCR of ±15 ppm/°C, ensuring stable voltage division ratios across operating temperature ranges.

2.2 Precision Measurement Instruments

Precision instruments such as high-voltage probes, digital multimeters, and calibration equipment require extremely high resistance accuracy and stability:

• High-voltage dividers: Ratio accuracy up to ±0.1%, ratio temperature coefficient < ±5 ppm/°C
• Ultra-high resistance: Single component up to 4 GΩ, reducing series connection count and parasitic capacitance
• Low voltage coefficient: 0.1 ppm/V, ensuring full-range linearity
• Long-term stability: Annual drift < ±0.05%

3. Supply Chain and Delivery Capability

Delivery time: 4 weeks for standard models, 6 weeks for custom models.

Compared to OHMITE and Ohmcraft's 20+ week lead time, significantly shortens project cycles and helps customers bring products to market faster.

Customization capability: Based on CNC laser cutting technology, enables customization of substrates in any shape without tooling, with MOQ as low as 100 pieces.

Supports 1:1 dimensional replication, 100% compatible with existing PCB designs.

Technical support: Provides comprehensive technical support services including selection guidance, circuit simulation, and failure analysis.

Engineering team can assist customers in completing product validation and certification work.

4. OHMITE Model Cross-Reference Guide

HVC HVR Series offers "drop-in replacement" with 100% dimensional compatibility for existing PCB designs.

3.1 Slim-Mox 100 Series (Standard Power)

Compact design for space-constrained applications:

3.2 Slim-Mox 200 Series (High Power)

Designed for high voltage (X-ray) applications:

3.3 Slim-Mox 300 Series (High Power/High Voltage)

Ideal for CT scanners and high power applications:

5. OHMITE Full Series Model Comparison Table

Complete breakdown of OHMITE high voltage thick film resistors, covering Slim-Mox, Ultra-Mox, ARC2, MOX and other product lines.

A. Slim-Mox Series (Flat Type High Voltage Resistors)

Note: Abbreviations match the table headers. A/B/C = length, width, lead pitch (mm); d = lead diameter (mm). The last column is the HVC model. “—” indicates not listed in the source.

B. Slim-Mox Series (Compact Type)

Note: Same meanings as the column titles below. A/B/C = length, width, lead pitch (mm). Last column: HVC model. “—” indicates not listed.

C. Ultra-Mox Series (Ultra-High Power)

Note: A/B/C are length, width, and lead pitch (mm). Last column: HVC model.

D. ARC2 Tubular Resistor Series

Note: A/B/C are length, width, and lead pitch (mm). Last column: HVC model.

E. MOX Tubular Resistor Series

Note: A/B/C are length, width, and lead pitch (mm). Last column: HVC model.

6. OHMITE Standard Model Reference (100+ Models)

Complete list of OHMITE high voltage thick film resistor standard models:

Note: All models listed are standard OHMITE high voltage thick film resistor products. FE indicates 1% tolerance, JE indicates 5% tolerance. For detailed specifications or HVC alternatives, please contact: sales@hv-caps.com

7. HVC Part Numbering System

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

Ordering Example: Replace SLIM-MOX 102 → HVR-GFP-102-1M-F-0.5W-5kV

8. Summary

HVC's HVR Series high voltage thick film resistors provide reliable OEM alternatives for OHMITE Slim-Mox / Ultra-Mox / ARC2 / MOX series products. With advanced materials (RuO₂ + 96% Al₂O₃) and precision manufacturing, HVC delivers superior TCR (±15 ppm/°C), VCR (0.1 ppm/V), and dimensional compatibility.

With 500+ standard models available across 5 product series, HVC offers comprehensive coverage for high voltage applications in medical imaging, precision measurement, industrial equipment, and more.

9. Contact & Technical Support

If you are looking for alternatives to OHMITE Slim-Mox / Ultra-Mox (or related series), or need assistance with high voltage thick film resistor selection and customization, HVC's engineering team is ready to support you.

We promise to provide free sample testing and manufacturer-level technical support for all replacement projects, jointly promoting the continuous development of high-voltage technology.

Copyright: © HVC Capacitor. All rights reserved. No reproduction or commercial use without permission.
Disclaimer: Parameters herein are for reference only; refer to the latest datasheet and any mutually agreed technical specifications for binding values.