A metal oxide film fixed resistor produced by BEC is a type of passive electronic component with a non-adjustable resistance value, constructed by depositing a thin film of metal oxide (e.g., tin oxide, ruthenium oxide) onto a ceramic substrate-often via thermal decomposition or sputtering. It is a rugged, high-performance variant of film resistors, balancing better thermal stability, high-temperature tolerance, and power handling than standard metal film (NiCr) resistors, while retaining higher precision than carbon-based resistors. It is widely used in high-temperature, moderate-power, and harsh-environment circuits (industrial, automotive, power electronics) where durability and stable performance under heat are critical.
Basic Parameters
|
Product Category |
Metal oxide film fixed resistor |
|
Resistance Range |
0.1Ω~680KΩ |
|
Rated Power |
1/4W~7W |
|
T/C |
±350ppm/℃ |
|
Tolerance |
±1%. ±2%, ±5% |
|
Certificate |
RoHS, REACH |
|
Applications |
Power supplies, telecom equipment, medical devices, industrial applications |
Characteristics
Substrate: High-purity 96%+ alumina (Al₂O₃) ceramic (thicker than metal film substrates) - provides superior thermal conductivity, electrical insulation, and mechanical rigidity to dissipate heat and resist warping under thermal stress.
Resistive Layer: A thin (2–10μm) film of metal oxide alloy (the defining material) - most commonly tin dioxide (SnO₂) (standard grade) or ruthenium oxide (RuO₂) (high-temp/specialty grade), often blended with antimony oxide for resistance tuning. Deposited via thermal decomposition (most common) or sputtering for uniform film thickness.
Trimming: A helical groove is cut into the oxide film (laser trimming for ±1% precision grades, mechanical trimming for ±5% cost-optimized grades) to calibrate the exact resistance value.
Terminations: Nickel-copper metal end caps with a nickel barrier layer (prevents corrosion, tin whiskering, and oxidation) - fitted with axial lead wires (THT) (dominant form factor) or solderable matte tin contacts (SMD variants). Designed for high-temperature soldering compatibility (260°C+).
Protective Coating: Hard glass or glass-epoxy coating (vs. epoxy for metal film resistors) - heat-resistant, chemically inert, and impermeable to moisture/dust. Shields the oxide film from thermal shock, corrosion, and mechanical damage; laser-printed resistance/ tolerance markings (on THT variants) are applied here.
Production Process
Parts of Our Production Facilities
FAQ
Q1: What tolerance and TCR values are available for metal oxide film fixed resistors?
A1: Tolerance (precision) and TCR (Temperature Coefficient of Resistance, thermal stability) are tiered for different design needs-smaller values = higher precision/stability:
Tolerance Options:
±0.01%/±0.05%: Ultra-precision (test equipment, medical diagnostics, aerospace reference circuits).
±0.1%: De facto standard for most precision design (industrial controls, automotive signal paths, telecom).
±1%: Cost-effective precision (high-end consumer electronics, non-critical industrial circuits).
TCR Options
±5/±10 ppm/°C: Ultra-stable (high-temperature environments: automotive engine bays, industrial furnaces).
±25 ppm/°C: Standard precision (most common-telecom, computing, automotive infotainment).
±50/±100 ppm/°C: Cost-effective stability (low-temperature-variation circuits: consumer electronics, cabin automotive systems).
Q2: Is a metal oxide film resistor the same as a carbon film resistor?
A2: No-they are fundamentally different in performance and construction, with metal oxide as a rugged, higher-precision upgrade to carbon film:
Carbon film: Low cost, ±5%/±10% tolerance, poor thermal stability (±150–600 ppm/°C), max temp +125°C, high noise-for non-precision, low-heat circuits (e.g., basic lighting, switching).
Metal oxide film resistors: Moderate cost, ±1%/±5% tolerance, better thermal stability (±100–300 ppm/°C), max temp +200°C+, low-to-moderate noise-for harsh-environment, moderate-precision circuits (e.g., industrial power supplies, automotive under-hood).
Metal oxide film fixed resistors have no carbon degradation, so they offer far better long-term stability than carbon film resistors.
Hot Tags: metal oxide film fixed resistor, China metal oxide film fixed resistor manufacturers, suppliers, factory, AC Automotive Grade Thick Film Chip Resistor, AEC 200 Resistor, chip resistor, FRC Standard Thick Film Chip Resistor, Metal Oxide Film Fixed Resistor, Yageo 0805 resistor
