Resistors for Medical & Imaging
Medical imaging and life-support equipment subject resistors to combined HV stress and ME (medical electrical) safety requirements. X-ray generator anode supplies use 70–150 kV resistor dividers with TCR < 25 ppm/°C and voltage coefficient < 1 ppm/V. MRI gradient amplifiers dissipate up to 30 kW peak in damping resistors during slew-rate transitions. External defibrillators store 360 J in a 32 µF capacitor and use a current-limiting / discharge resistor of 50 Ω rated at 10 kV impulse. Ventilator blower drives, ECMO pumps and surgical lasers also rely on snubber and brake resistors. Compliance includes IEC 60601-1 (general safety), IEC 60601-1-2 (EMC), IEC 60601-2-44 (CT), IEC 60601-2-33 (MRI) and ISO 13485 quality system. Hongyi supplies ISO 13485-traceable parts with full risk-management file per ISO 14971 to FDA QSR and EU MDR submissions.
Key Requirements
- IEC 60601-1 ed.3.2 working voltage and MOPP (means of patient protection) compliance
- X-ray HV divider TCR < 25 ppm/°C and VCR < 1 ppm/V for stable kVp accuracy
- Defibrillator pulse rating 10 kV / 50 µs / 360 J single-shot capability
- ISO 13485 design-history file with biocompatibility cross-reference if surface-contact
- EMC compliance to CISPR 11 Group 1 Class A radiated and conducted
How to Select
- Specify HV divider with paired matched-pair TCR tracking ≤ 5 ppm/°C for kVp ratiometric stability
- Confirm partial-discharge inception ≥ 1.2× rated voltage per IEC 60270
- Select non-magnetic materials (no nickel cores) for MRI bore-side parts
- Validate single-pulse failure mode is open-circuit (not flash-over) for defibrillator safety
- Demand UDI labeling and lot traceability for FDA / MDR post-market surveillance
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Read articleFrequently asked questions
Are your medical-grade resistors ISO 13485 traceable?
Can you supply non-magnetic resistors for MRI bore-side gradient amplifiers?
How do I verify the pulse rating for a defibrillator discharge resistor?
Do you provide an ISO 14971 risk-management contribution for our submission?
Sample Request
Standard samples are provided free of charge in reasonable quantities (shipped within 2–3 business days). Custom samples are delivered within 2–4 weeks. Please use the form on the right to tell us:
- Company and contact details
- Target part number or key specs (power / resistance / package)
- Application scenario and estimated annual volume
- Shipping address and expected delivery date