BWN Series AEC-Q200 Air-Cooled Chip Shunt Resistors

What are the BWN Series AEC-Q200 Air-Cooled Chip Shunt Resistors?

The BWN series is a family of air-cooled surface-mount chip shunt resistors designed to deliver strong long-term stability in current sensing applications across the automotive and industrial power electronics sectors. Where the BCS, ECS, BWR, and BWB series address sub-milliohm and very-low-milliohm sensing requirements, the BWN series targets the higher end of the low-resistance shunt range — from 2 mΩ to 30 mΩ — covering applications where a moderate resistance value is preferred to generate a larger, more easily resolved voltage drop across the shunt at lower current levels, without recourse to active amplification beyond what is practical in the available circuit area. The air-cooled thermal design relies on convective heat transfer from the component body and the surrounding PCB copper rather than a dedicated heatsink or busbar connection, simplifying board layout while maintaining the power ratings required for the target applications.

Two package variants are offered. The BWN02 is rated at 2 W and covers resistance values of 3 mΩ, 5 mΩ, 10 mΩ, 20 mΩ, and 30 mΩ, with package dimensions of 11.0 mm × 3.1 mm × 3.1 mm. The BWN05 is rated at 5 W and covers 2 mΩ, 5 mΩ, 6 mΩ, and 10 mΩ, with an overall length of 6.1 mm and the same width and height profile as the BWN02. Both variants maintain a TCR of ≤100 ppm/°C across the full resistance range, ensuring that resistance drift with temperature remains predictable and bounded within the measurement error budget of the sensing circuit as junction and ambient temperatures vary during normal operation. Tolerance grades of ±1%, ±2%, and ±5% are available as standard across the range.

The combined absolute-and-percentage resistance change limits used throughout the BWN reliability test programme are appropriate to low-milliohm components, where a percentage-only limit would be unnecessarily restrictive at the higher resistance values and insufficiently tight at the lower ones. Thermal shock is tested from −55°C to +150°C over 1000 cycles with 15-minute dwell at each extreme to a limit of ±(1.0% + 0.5 mΩ). High-temperature exposure at +170°C for 1000 hours unpowered is held to the same limit. Biased humidity at 85°C and 85% RH with 10% power bias for 1000 hours, short-time overload at five times rated power for five seconds, low-temperature storage at −65°C for 45 minutes, mechanical shock at 100 g for six milliseconds over five pulses, vibration from 10 Hz to 200 Hz across three directions for 12 hours, and load life at 70°C for 1000 hours on a 1.5-hour-on, 0.5-hour-off cycle are all tested to a resistance change limit of ±(0.5% + 0.5 mΩ). Resistance to solder heat is confirmed at 260°C for ten to twelve seconds at the same limit.

Model: BWN
Resistor type: AEC-Q200
Description: Shunt
Power Rating: 2W~5W
Resistance (Ω): 2m~30m
Tolerance (%): ±1, ±2, ±5
TCR (ppm/C): 100 max.

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