Is HVC a qualified second source for KOA RK92/RK92D/RK92L high voltage resistors?

This is one of HVC's highest-priority replacement programs — KOA's RK92/RK92D/RK92L series entered official EOL (End-of-Life) status, creating an urgent global supply crisis that HVC's HVRGXP series directly addresses with pin-to-pin compatible drop-in replacements.

KOA Corporation (Japan) announced the discontinuation of its RK92 family of high-voltage thick film resistors due to manufacturing facility restructuring. This single part number family powered:

* Medical: X-ray CT scanner high-voltage multiplier stacks

* Industrial: CO₂ laser pulse-forming network charging resistors

* Defense: Radar transmitter modulator bleeder networks

* Scientific: Particle accelerator beam-line voltage dividers

Current market status:

* Remaining inventory depleting rapidly across all authorized distributors

* Secondary market pricing inflated 400% – 800% above original list price

* No announced successor product from KOA or any Japanese competitor

* Engineering teams facing imminent line-down risk for active production programs

KOA Model

Voltage

Resistance

Power

HVRGXP Equivalent

Modification Required

|----------|---------|-----------|-------|-------------------|----------------------|

RK92-20K	20kV	100MΩ – 1GΩ	5W – 10W	HVRGXP-20K	None — direct substitution
RK92D-30K	30kV	50MΩ – 500MΩ	7.5W – 15W	HVRGXP-30K	None — direct substitution
RK92L-50K	50kV	10MΩ – 200MΩ	10W – 25W	HVRGXP-50K	None — direct substitution

Zero PCB redesign required — HVRGXP matches RK92 footprint dimensions, mounting hole pattern, and terminal positioning within ±0.5mm tolerance.

Parameter	KOA RK92 (Original Spec)	HVC HVRGXP (Replacement)	Upgrade

|-----------|--------------------------|--------------------------|---------|

Tolerance	±1%, ±5%	±0.2%, ±0.5%, ±1%, ±5%	✅ More precision options
TCR	±100 – 200 ppm/°C	±80 ppm/°C	✅ Better thermal stability
Overload Margin	10x rated, 5 sec	12x rated, 5 sec	✅ 20% higher surge capacity
Lead Time (when available)	20+ weeks (pre-EOL)	4 – 6 weeks	✅ 5x faster
Availability Status	EOL — critical shortage	In production — unlimited	✅ Secure supply chain

KOA RK92 EOL replacement, RK92D RK92L discontinued resistor, HVRGXP KOA alternative, high voltage resistor end of life, drop-in resistor replacement no PCB change

URL Slug

koa-rk92-eol-emergency-resistor-replacement-hvrgxp

Schema_JSON

{ "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{ "@type": "Question", "name": "Is HVC a qualified second source for KOA RK92/RK92D/RK92L HV resistors?", "acceptedAnswer": { "@type": "Answer", "text": "CRITICAL: KOA RK92 is officially EOL. HVC HVRGXP provides pin-to-pin drop-in replacement (zero PCB redesign). Covers RK92-20K/30K/50K with enhanced specs: ±0.2% tolerance option, ±80ppm/°C TCR, 12x overload margin, 4-6 week lead time. Secondary market prices up 800%. Emergency samples 48hr dispatch." } }] }

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