Executive Summary

In medical imaging (CT/X-Ray), high-voltage power supplies, and precision industrial control fields, SIP (Single In-line Package) high-voltage thick film resistors are critical components for ensuring stable system operation. For a long time, Japan's KOA RK92 series has dominated this niche market, leading to a significant "single-source" risk for a large number of high-end equipment globally.

As KOA's strategic adjustments led the RK92 series to enter the End-of-Life (EOL) phase, this dependency has transformed into a substantial supply chain crisis. HVC Company, leveraging its profound expertise in high-voltage thick film technology, has launched the HVRGXP series. This series not only achieves Pin-to-Pin precise alignment with KOA RK92 in technical parameters but also provides global customers with a safe, controllable, and high-performance "strategic backup solution" through its flexible manufacturing and rapid delivery system.

At-a-glance benchmark: KOA RK92 vs HVC HVRGXP

1. Industry Background: The 'Gray Rhino' Crisis in High-Voltage Resistor Supply Chains

As global manufacturing supply chains are being restructured, the market for through-hole high-voltage thick film resistors is experiencing a quiet crisis.

1.1 The Vulnerability of 'Single Sourcing'

For a long time, KOA RK92 has been widely 'Designed-in' due to its stability. However, over-reliance on a single brand has led to extremely high risk exposure. Should the original manufacturer face force majeure or strategic adjustments (e.g., a complete shift in production capacity to automotive-grade SMD components), downstream equipment manufacturers would face a critical shortage of supplies.

1.2 The Impact of KOA RK92's End-of-Life

Starting in 2023, the lead time for the KOA RK92 series extended from a standard 8 weeks to over 30 weeks, eventually leading to its End-of-Life. For medical and industrial control equipment with lifecycles of 10-20 years, this means a mandatory search for alternatives, otherwise, they would be forced to redesign PCBs, incurring extremely high validation costs.

2. HVC's Solution: The Strategic Value of the HVRGXP Series

Addressing the aforementioned pain points, HVC Electronics has launched the HVRGXP series of high-voltage thick film resistors, achieving a leap from "simple replacement" to "supply chain upgrade" through innovations in three key dimensions:

2.1 Performance Parameters: Expert-Level Precise Alignment

The HVRGXP series is not merely a replica but an upgraded product based on 96% high-purity alumina substrates. * Pin-to-Pin Compatibility: Strictly replicates the physical dimensions of KOA RK92 (e.g., 26mm, 9.6mm, 30mm lengths), eliminating the need for PCB design modifications. * Enhanced Electrical Performance: Through unique serpentine non-inductive printing technology, the Temperature Coefficient of Resistance (TCR) is stabilized at ±50~100ppm/℃ (industry standard is typically ±200ppm), and it exhibits superior VCR (Voltage Coefficient of Resistance) characteristics under high-voltage pulses.

2.2 Flexible Manufacturing: Solving 'Supply Interruption' and 'Non-Standard' Challenges

Unlike KOA's rigid standard product lines, HVC has deployed high-precision Laser Trimming production lines. * Custom Resistance Values: Whether standard 10MΩ or special 4.56GΩ, HVC can produce them, with extremely low Minimum Order Quantities (MOQ). * Rapid Delivery System: By optimizing the thick film sintering process, HVC controls standard lead times to 4-6 weeks. For urgent line-down projects, a 2-week rapid response channel can be provided.

3. Practical Comparison: KOA RK92 vs HVC HVRGXP Precise Replacement Table

To ensure a seamless transition, HVC engineers have compiled the following Pin-to-Pin replacement list for key models, based on KOA's original specifications and actual measurement data.

Please note: The HVC HVRGXP series fully covers KOA's various size specifications, including 9.6mm (small), 26mm (medium), and 30mm (large).

Note: The suffixes in HVC model numbers (e.g., 7.26, 5.10) represent the physical dimensions of the substrate, ensuring that the mounting hole spacing is identical to the original KOA part.

4. Implementation Roadmap: Zero-Risk Transition from Evaluation to Mass Production

To help customers smoothly navigate the RK92 EOL period, HVC provides a standardized integration process:

• Parameter Alignment Period (1-3 days): Customers provide the original KOA model (e.g., RK92-11HD...), and HVC issues a detailed specification comparison report.

• Sample Validation Period (1-2 weeks): HVC provides free samples for customers to conduct on-board testing (focusing on: mounting dimensions, voltage withstand test, temperature rise performance).

• Small-Batch Pilot Production (4 weeks): Conduct a small-batch trial run of 100-500pcs to verify batch consistency.

• Safety Stock Establishment (Long-term): Sign a supply guarantee agreement, and HVC establishes VMI (Vendor-Managed Inventory) to ensure long-term stable supply.

5. Conclusion: Professionalism Ensures Security

In today's supply chain full of uncertainties, choosing the HVC HVRGXP series is not just about replacing an EOL KOA resistor; it's about introducing an expert partner in high-voltage resistors for your equipment.

We guarantee the quality and supply security of every resistor with a rigorous high-voltage insulation engineering approach.

Get Your Strategic Replacement Solution

Please contact the HVC technical team to get the KOA RK92 EOL Replacement Cross-Reference Table and free test samples.

• Email: sales@hv-caps.com
• Official Website: www.hv-caps.com

• Copyright © 2026 HVC Company. KOA and RK92 mentioned herein are registered trademarks of their respective holders, and this article is for technical compatibility and replacement selection purposes only.*