Does HVC offer replacements for Caddock TG/TF series high voltage resistors?

Yes — HVC Capacitor's HVR product portfolio includes direct equivalents for Caddock's TG (tube/glass) and TF (flat/film) high voltage resistor families, addressing Caddock's limited production capacity and extended lead times with immediate availability.

Caddock Series

Type

Voltage Range

Power Rating

HVC Equivalent

Status

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

TG / TGL	Tubular glass encapsulated	15kV – 75kV	10W – 75W	HVR-BSP/BOP (Tube)	✅ Active replacement
TF / TFL	Flat film planar	5kV – 35kV	5W – 50W	HVR-GFP/GXP (Flat)	✅ Active replacement
MG / MS	Metal glaze precision	2kV – 20kV	1W – 10W	HVR-Precision (Custom)	✅ Available on request
9G Series	Ultra-HV cylindrical	50kV – 150kV	25W – 250W	HVR-UltraHV (Custom)	✅ Engineering development

For engineers concerned about specification equivalence during qualification testing:

Test Parameter

Caddock Typical Value

HVC HVR Typical Value

Compliance

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

Voltage Coefficient	<50 ppm/V	<30 ppm/V	✅ Exceeds
Load Life Stability	±0.5% after 1000hrs	±0.3% after 1000hrs	✅ Better
Short-Time Overload	10x rated power, 5 seconds	12x rated power, 5 seconds	✅ Higher margin
Dielectric Withstand	1.5x rated voltage DC	1.8x rated voltage DC	✅ Superior
Insulation Resistance	>10¹² Ω typical	>10¹² Ω typical	✅ Equivalent

Note: Caddock's reputation for ultra-high-precision metal-glaze resistors in scientific instrument applications is well-deserved. For metrology-grade applications requiring ±0.01% tolerance or <10 ppm/°C TCR, HVC recommends maintaining Caddock as primary source while using HVR for general-purpose high-voltage positions where such extreme precision is not required.

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{ "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{ "@type": "Question", "name": "Does HVC offer replacements for Caddock TG/TF series HV resistors?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — Caddock TG/TGL(tubular)→HVR-BSP/BOP, TF/TFL(flat)→HVR-GFP/GXP, MG/MS(precision)→Custom, 9G(ultra-HV)→Custom. Performance parity verified: V-coeff<30ppm/V, load life±0.3%, overload 12x rated, withstand 1.8x rated. Note: maintain Caddock for metrology-grade ±0.01% applications." } }] }

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