Resistors for Automotive Electronics
Modern xEV powertrains and ADAS-equipped vehicles place resistors at safety-critical nodes: pre-charge for 400 V / 800 V battery packs, active discharge after a crash event per ECE R100, current sensing in the inverter shunt path, and bleeder circuits in the on-board charger (OBC). Every passive component touching the HV bus must be AEC-Q200 Rev D qualified, traceable through IATF 16949, and survive 1000 thermal shock cycles from -40°C to +150°C. Mission-profile testing follows LV124 / LV148 for 12 V and 48 V rails. Hongyi delivers PPAP Level 3 documentation, 8D root-cause reporting, and ISO 26262 functional-safety evidence (resistors as supporting hardware elements) for tier-1 powertrain and battery integrators.
Key Requirements
- AEC-Q200 Rev D qualification with full PPAP Level 3 documentation
- IATF 16949 traceability — wire-rod heat number to finished resistor
- Operating range -40°C to +150°C with 1000-cycle thermal shock survival
- ECE R100 active-discharge of HV bus to < 60 V within 5 s after crash signal
- LV124 / LV148 compatible for 12 V and 48 V mild-hybrid rails
How to Select
- Confirm AEC-Q200 Rev D test report including 1000-h biased humidity 85°C / 85% RH
- Verify pulse rating against worst-case crash-discharge energy (½ × C × V²)
- Specify low-inductance winding for shunt-based current sensing (< 20 nH)
- Require batch-level X-ray and acoustic-microscopy traceable to VIN if required
- Demand PPAP Level 3 with control plan, FMEA, and Cpk ≥ 1.67 on resistance tolerance
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Read articleFrequently asked questions
Are your automotive resistors AEC-Q200 Rev D qualified and how do I receive the report?
Can you support PPAP Level 3 submission for a tier-1 EV inverter program?
What is the difference between a 400 V and 800 V battery pack pre-charge resistor design?
Do you provide ISO 26262 functional-safety documentation?
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