RSN2726 Square E-beam Welding Alloy Resistors
The RSN2726 is a square e-beam welding alloy resistor built from a manganese copper resistive body with pure copper electrodes, joined by electron-beam welding, and intended as a current-detection sensing element. It is offered in resistance values from 0.1mΩ to 0.3mΩ, with rated power of 12W for the 0.1-0.2mΩ values and 11W for the 0.3mΩ value at 70°C. The general specification table lists a temperature coefficient of resistance of ±150ppm/°C, while the construction notes describe the manganese copper material itself as low TCR, below 20ppm/°C. Tolerance options are ±0.5%, ±1% and ±5%. Parasitic inductance is held below 1nH and thermal EMF below 1μV/°C, and the operating temperature range extends from -55°C to +170°C. The part is RoHS compliant and AEC-Q200 qualified, offers high reliability, long-term stability and superb pulse load capability, and is supplied taped and reeled on 13-inch reels for 16mm tape.
What are the RSN2726 Square E-beam Welding Alloy Resistors?
The RSN2726 is a current-sensing resistor built from a manganese copper resistive body joined to pure copper electrodes by electron-beam welding, in a compact square-format package. The all-metal construction is finished with surface pickling and passivation treatment, giving the part resistance to vulcanization and strong weather resistance. Because the resistive element is a solid manganese copper alloy body rather than a wound or deposited element, the RSN2726 carries ultra-low parasitic inductance and a fast response, making it suited to high-frequency AC current detection in addition to DC current sensing, and it offers superb pulse load capability along with high reliability and long-term stability.
The RSN2726 is offered in two resistance groupings within a single manganese copper material option. Values from 0.1mΩ to 0.2mΩ are rated at 12W, and the 0.3mΩ value is rated at 11W, both at 70°C ambient. Tolerance is available in ±0.5%, ±1% or ±5%, and all variants share a parasitic inductance below 1nH, a thermal EMF of less than 1μV/°C over 0-100°C, and an operating temperature range of -55°C to +170°C. Rated power follows a derating curve that holds 100% of rated power up to 70°C ambient before linearly reducing to zero at 170°C.
Physically, the RSN2726 measures 6.95mm in length and 6.6mm in width across both resistance groupings. The 0.1-0.2mΩ values have a body height of 2.3mm and a thickness of 1.7mm, while the 0.3mΩ value has a body height of 2.1mm and a thickness of 1.5mm; both share a lead height of 0.5mm. The part is qualified to IEC60115-1 test methods covering temperature coefficient of resistance, solderability, short-time overload, resistance to soldering heat, high-temperature and humidity exposure, high-temperature storage, low-temperature load, temperature cycling and load life, and is AEC-Q200 qualified and RoHS compliant. Parts are supplied on 13-inch reels for 16mm tape, in quantities of 2,000 pieces per reel.
RSN2726 Square E-beam Welding Alloy Resistor Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Series: RSN2726
Product group: Current sensing resistor
Description: AEC-Q200, Square E-beam Welding Alloy Resistor
Power Rating: 11W, 12W
Resistance (Ω): 0.1m~0.3m
Tolerance (%): ±0.5, ±1, ±5
TCR (ppm/C): 150
Applications of the RSN2726 Square E-beam Welding Alloy Resistor
Where RARA current sensing resistors are deployed in the field.
The RSN2726 as an ideal solution for current detection applications, and its ultra-low parasitic inductance and fast response make it specifically suited to high-frequency AC current detection as well as general DC current sensing.
The AEC-Q200 qualification indicates suitability for automotive electronics, and its high reliability, long-term stability and pulse-load capability are the type of specification generally sought in shunt-based current-sensing circuits, such as current feedback loops in motor drives and inverters and output current monitoring in power supplies, where accurate, stable measurement of current is required.
Related Products of the RSN2726 Square E-beam Welding Alloy Resistor
Model: PCBS
Resistor type: AEC-Q200 PCB+shunt
Description: Current sensing module
Rated Current: 350~1000A
Resistance (Ω): 25u, 50u, 100u
Tolerance (%): ±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.
