The BPR56 0.1Ω 5W Power Resistor is a non-inductive, ceramic cement-encapsulated metal strip power resistor engineered for current sensing, feedback loops, and power amplification stages. Featuring an ultra-low resistance value of 0.1 Ohm (0R1 / R10), a 5-watt continuous power rating, and high thermal stability, the BPR56 is widely used in high-fidelity audio power amplifiers, switch-mode power supplies (SMPS), motor drives, and electronic load circuits.

Specifications

• Model / Series: BPR56 Series (Non-Inductive Ceramic Cement Power Resistor)
• Resistance Value: 0.1Ω (0.1 Ohm / 0R1 / R10)
• Power Rating: 5 Watts (at 70°C)
• Resistance Tolerance: ±5% (J) / ±10% (K)
• Element Type: Metal Alloy Strip / Plate (Non-Inductive Construction)
• Temperature Coefficient (TCR): ±250 ppm/°C to ±350 ppm/°C
• Dielectric Withstanding Voltage: 1000V AC for 1 minute
• Insulation Resistance: ≥ 1000MΩ (at 500V DC)
• Short-Time Overload: 5 × Rated Power for 5 seconds
• Operating Temperature Range: -55°C to +155°C (Derated above 70°C)
• Body / Enclosure: Flame-Retardant Ceramic Case with Inorganic Cement Sealing (UL94 V-0)
• Lead Type: Radial / Through-Hole Tinned Copper Leads (Standard pitch for PCB mounting)

Features

• Non-Inductive Metal Strip Element: Eliminates internal parasitic inductance, making it ideal for high-frequency switching and fast transient current sensing without waveform ringing.
• High Pulse & Surge Capability: Heavy metal strip structure easily absorbs high inrush currents and short-duration power surges without open-circuit failure.
• Flameproof & Thermally Stable: Encapsulated in a high-grade ceramic shell filled with non-flammable cement to ensure safety under extreme overload conditions.
• Radial Through-Hole Leads: Space-saving vertical/radial lead configuration allows direct PCB mounting and optimal natural convective air cooling.
• Low Resistance Drift: Delivers stable current-sense voltage drops across wide operating temperature variations.

Common Applications

• Audio Power Amplifiers: Emitter/source balancing resistors in Class-AB, Class-B, and high-power discrete amplifier output stages.
• Current Sensing & Shunts: Shunt resistor in DC-DC converters, battery chargers, and power supply feedback loops.
• Over-Current Protection (OCP): Voltage drop sensing for short-circuit detection in motor controllers and inverters.
• Inrush Current Limiting: Soft-start and surge suppression in AC/DC power adapters and industrial power supplies.
• Electronic Loads & Dummy Loads: Power dissipation elements in laboratory test instruments and battery capacity testers.

Usage Tips

• Amplifier Output Balancing: In multi-transistor audio amplifier stages, place this 0.1Ω resistor in series with each transistor emitter/source to equalize current sharing and prevent thermal runaway.
• Thermal Clearance & Spacing: Leave a 2mm to 5mm air gap between the resistor body and the PCB to allow adequate air circulation when operating near the 5W continuous dissipation limit.
• Kelvin Current Sensing: When using this resistor as a precision current shunt, take voltage sense traces directly from the resistor lead bases rather than along high-current traces to avoid PCB trace resistance errors.
• Lead Bending Precaution: Support the leads with needle-nose pliers near the ceramic body before bending to avoid cracking the ceramic casing or breaking the internal solder weld.

Datasheet