BCS Series AEC-Q200 Chip Shunt Resistors (BCS2512 / BCS3920 / BCS5930)
The BCS series comprises electron-beam welded alloy current-sense resistors built with pure copper electrodes, available in the BCS2512, BCS3920 and BCS5930 case sizes. Resistance values range from 0.1mΩ to 5mΩ depending on case size and resistive alloy, with power ratings (at 70°C) spanning from 2.5W up to 15W according to model and resistance value. Tolerance options of ±0.5%, ±1.0% and ±5.0% are offered, with temperature coefficient of resistance figures ranging from ±25ppm/°C to ±200ppm/°C depending on the alloy and resistance value selected. All three case sizes share parasitic inductance below 5nH and thermal EMF below 1μV/°C, and are rated for an operating temperature range of –55°C to +170°C. The series is RoHS compliant and AEC-Q200 qualified, and is supplied in tape-and-reel or bulk packaging.
What are the
BCS Series AEC-Q200 Chip Shunt Resistors (BCS2512 / BCS3920 / BCS5930)?
The BCS series is a family of surface-mount current-sensing resistors manufactured using an electron-beam welding (EBW) process that joins pure copper terminals to a resistive alloy element, forming an all-metal structure with no solder or adhesive bonds in the current path. Three resistive alloys are offered across the range: Manganin (M), Fe-Cr-Al (F) and Karma (K), each chosen to balance resistance value, tolerance and temperature stability for a given application. Surface pickling and passivation treatment gives the construction strong resistance to weathering and environmental degradation, while the welded, all-metal build delivers excellent product consistency, high reliability and stability, and strong pulse-load capability.
Electrical performance is built around very low parasitic inductance, kept under 5nH across all three case sizes, together with thermal EMF held below 1μV/°C from 0 to 100°C. This combination gives the BCS series a fast response speed and makes it well suited to high-frequency AC current detection, where stray inductance or thermally generated offset voltages would otherwise corrupt the sensed signal. The BCS2512 is the smallest of the three footprints, offering resistance values from 0.3mΩ to 5mΩ at power ratings of 2.5W to 6W; the BCS3920 steps up to a larger footprint with resistance values from 0.1mΩ to 5mΩ and ratings of 3W to 12W; and the BCS5930 is the largest and highest-power option, covering 0.1mΩ to 3mΩ at ratings up to 15W. Across all three sizes, tighter tolerances and lower TCR figures are generally available on the higher-resistance, Fe-Cr-Al variants, while the Manganin variants extend down to the lowest resistance values in the range.
Each part is qualified against a comprehensive set of environmental and electrical tests, including short-time overload at five times rated power, resistance to soldering heat, high-temperature and high-humidity exposure, high-temperature storage, low-temperature load, 1000-cycle temperature cycling between –55°C and +155°C, and 1000-hour load-life cycling at rated current. A derating curve defines full rated power up to roughly 70°C ambient, with power capability falling linearly to zero as ambient temperature approaches 170°C, consistent with the series' –55°C to +170°C operating range. One note of caution applies to the Fe-Cr-Al (F) alloy variants: because this material is magnetic, it may interact with variable-frequency currents, so designers working with such currents should select the alloy option with care.
BCS Series AEC-Q200 Chip Shunt Resistors (BCS2512 / BCS3920 / BCS5930) Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: BCS2512
Resistor type: AEC-Q200 Chip Shunt
Description: Precision, E-beam welded
Power Rating: 2.5W~6W
Resistance (Ω): 0.3~5m
Tolerance (%): ±0.5, ±1, ±5
TCR (ppm/C): 50-150
Model: BCS3920
Resistor type: AEC-Q200 Chip Shunt
Description: Precision, E-beam welded
Power Rating: 3W~12W
Resistance (Ω): 0.1~5m
Tolerance (%): ±1, ±5
TCR (ppm/C): 25-175
Model: BCS5930
Resistor type: AEC-Q200 Chip Shunt
Description: Precision, E-beam welded
Power Rating: 7W~15W
Resistance (Ω): 0.1~3m
Tolerance (%): ±1, ±5
TCR (ppm/C): 50-200
Applications of the
BCS Series AEC-Q200 Chip Shunt Resistors (BCS2512 / BCS3920 / BCS5930)
Where RARA current sensing resistors are deployed in the field.
The low inductance, low thermal EMF and fast response of the BCS series make it well suited to high-accuracy current sensing in switch-mode power supplies and DC-DC converters, where measurement fidelity at high switching frequencies is essential.
The series is equally applicable to motor drive and inverter current monitoring, battery management and charging systems requiring precise current measurement, and power metering or energy monitoring equipment.
Its pulse-load capability and welded, all-metal construction also suit it to overcurrent protection and current-limiting circuits, industrial power conversion equipment, and general precision current-sense applications across automotive, industrial and consumer power electronics where reliability and long-term stability under thermal and electrical cycling are required.
Related Products of the
BCS Series AEC-Q200 Chip Shunt Resistors (BCS2512 / BCS3920 / BCS5930)
Model: TCS8536
Resistor type: AEC-Q200 E-beam
Description: E-beam welded shunt
Power Rating: 36W
Rated Current: 600~1200A
Resistance (Ω): 0.1m, 0.05m, 0.025m
Tolerance (%): ±1, ±2, ±5
TCR (ppm/C): 100
Model: TCS8440T
Resistor type: AEC-Q200 E-beam
Description: E-beam welded shunt
Power Rating: 36W
Rated Current: 840A
Resistance (Ω): 0.05m
Tolerance (%): ±1, ±2, ±5
TCR (ppm/C): 100
Model: ECS
Resistor type: AEC-Q200
Description: Chip shunt
Power Rating: 1W~15W
Resistance (Ω): 0.2~10m
Tolerance (%): ±1, ±2, ±5
TCR (ppm/C): 100-200
Model: TCS
Resistor type: AEC-Q200 E-beam
Description: Shunt
Power Rating: 12W~36W
Rated Current: 200~350A
Resistance (Ω): 0.05~0.5m
Tolerance (%): ±1, ±2, ±5
TCR (ppm/C): 100
Why Choose RARA Current Sensing Resistors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
8 Sub-Categories
No other single supplier covers AEC-Q200 chip shunts, milliohm precision types, four-terminal Kelvin shunts, power metering, and 12,000A panel shunts under one ISO-certified roof.
02
Extreme Precision
HPS, UHPS, and PSS precision shunts deliver ±0.05% tolerance and 3 ppm/°C TCR — meeting the accuracy demands of EV battery coulomb counting, precision power analyzers, and billing-grade energy metering.
03
Automotive Qualified
Multiple AEC-Q200 certified models (BCS, LRA, ECS, BWR, TCS, PCBS) with IATF 16949 manufacturing certification — covering EV battery management, motor control, and charging applications.
04
Global Track Record
Trusted by Tesla, GM Korea, Proterra, Siemens, Rockwell, and Schneider Electric — deployed in EV powertrains, industrial drives, and utility metering systems across six continents.
