RSMD4527 SMD E-Beam Welding Alloy Resistor
The RSMD4527 is an electron-beam welded SMD alloy resistor with pure copper electrodes, intended as a current-sensing component. It is rated at 6W at 70°C and is offered in resistance values from 0.5mΩ to 1mΩ in Manganin and 2mΩ to 50mΩ in Karma alloy, with tolerance options of ±1% and ±5%. Temperature coefficient of resistance is ±100ppm/°C for the Manganin values and ±50ppm/°C for the Karma values. Parasitic inductance is held below 5nH 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 excellent product consistency, high reliability and stability, and superb pulse load capability, and is supplied taped and reeled on 13-inch reels for 25mm tape.
What are the RSMD4527 SMD E-Beam Welding Alloy Resistors?
The RSMD4527 is a current-sensing resistor built from a Manganin or Karma alloy resistor element joined to copper electrodes by a special electron-beam welding process that the manufacturer describes as a stable and reliable construction. The copper electrodes carry a nickel-plus-tin plating, the resistance value is applied by laser marking, and the full-metal assembly is encapsulated in a heat-resistant epoxy resin that is insulating and flame-retardant, giving the part strong weather resistance. The RSMD4527 carries ultra-low thermal EMF and ultra-low parasitic inductance, giving it a fast response suited to high-frequency AC current detection as well as general DC current sensing.
The RSMD4527 is offered in two resistance groupings within a single 6W power rating. Values of 0.5mΩ to 1mΩ use a Manganin element with a temperature coefficient of resistance of ±100ppm/°C, while values of 2mΩ to 50mΩ use a Karma element with a temperature coefficient of resistance of ±50ppm/°C. Tolerance is available in ±1% or ±5% across both groupings, and both share a parasitic inductance below 5nH, 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, and the part is specified for a reflow soldering profile with a preheat stage of 150-180°C for up to 120 seconds, a peak temperature of 260°C plus or minus 5°C for up to 10 seconds, and no more than 60 seconds above 220°C.
Physically, the RSMD4527 measures 11.5mm in length, 7.0mm in width and 5.5mm in overall depth, with a terminal dimension A of 2.55±0.4mm and a body thickness T of 2.5±0.15mm. The part is qualified to IEC60115-1 and related test methods covering temperature coefficient of resistance, solderability, short-time overload, solder heat resistance, substrate bending, flammability, insulation resistance, withstand voltage, 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 25mm tape, in quantities of 2,000 pieces per reel.
RSMD4527 SMD E-Beam Welding Alloy Resistor Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Series: RSMD4527
Product group: Current sensing resistor
Description: AEC-Q200, Metal Alloy Low-Resistance Resistors
Power Rating: 6W
Resistance (Ω): 0.5m~50m
Tolerance (%): ±1, ±5
TCR (ppm/C): 50, 100
Applications of the RSMD4527 SMD E-Beam Welding Alloy Resistor
Where RARA current sensing resistors are deployed in the field.
The RSMD4527 as an ideal solution for current-sensing 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 excellent product consistency, high reliability, stability and superb 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 under demanding thermal and pulse conditions is required.
Related Products of the RSMD4527 SMD 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.
