LRA Series AEC-Q200 Metal Alloy Low-Resistance Resistors
Lead-free, halogen-free metal alloy surface-mount resistors for precision current sensing in general-purpose and automotive applications
Eight package sizes: 1206, 2010, 2512, 2512H (with heatsink), 2725, 2728, 4527S (without heatsink), and 4527
Resistance range 0.2 mΩ to 300 mΩ
Power rating 0.5 W to 5 W depending on package and resistance value
Tolerance options ±0.5%, ±1%, ±2%, and ±5%
TCR as low as ±20 ppm/°C depending on variant; upper limit ±175 ppm/°C for the lowest resistance values
Operating temperature range −55°C to +170°C
AEC-Q200 qualified variant available across the LRA series
Tested to JIS C5201, JESD22, and MIL-STD-202 reliability standards
Supplied in tape and reel; 500 to 4000 pieces per reel depending on package size
RoHS compliant
What are the LRA Series AEC-Q200 Metal Alloy Low-Resistance Resistors?
The LRA series is a family of metal alloy low-resistance surface-mount resistors designed for precision current sensing across a wide range of power electronics and automotive applications. Each resistor is constructed from a precision metal alloy element selected to deliver stable, low-milliohm resistance values with a controlled temperature coefficient, enabling accurate voltage drop measurement across the shunt for current calculation without contributing significant power loss to the circuit. The LRA designation covers both general-purpose and AEC-Q200 qualified variants, making the series applicable from industrial power supply design through to the most demanding automotive electronic systems.
Eight distinct package footprints span the resistance and power requirements of the series. The compact 1206 package handles up to 1.5 W with resistance values from 0.5 mΩ to 50 mΩ. The 2010 extends the upper resistance limit to 100 mΩ at up to 2 W. The 2512 is the widest-ranging package in the series, covering 0.3 mΩ to 300 mΩ at power ratings from 1 W to 3 W, making it the preferred choice where a single package must address both very low and moderate resistance requirements. A 2512H variant adds a heatsink tab for improved thermal dissipation in the 2 W and 3 W configurations. The 2725 and 2728 packages target the 4 W to 5 W power range at sub-3 mΩ and sub-100 mΩ resistance values respectively. The larger 4527 and 4527S packages handle up to 5 W and cover resistances from 0.5 mΩ to 200 mΩ, with the 4527S omitting the heatsink feature for direct board-level mounting.
TCR performance is graduated by resistance range within each package. The lowest resistance values — where the alloy element is at its thinnest and most sensitive to temperature — carry a wider TCR limit of up to ±175 ppm/°C, while higher resistance values in the same package achieve ±20 to ±25 ppm/°C. The tightest tolerance grade of ±0.5% is available across the majority of the range, narrowing to selected resistance values in the most demanding configurations. Overload current capability is defined by a five-times rated power pulse for five seconds. The full reliability test programme covers short-time overload, high-temperature storage at +170°C for 1000 hours, low-temperature storage at −55°C for 1000 hours, temperature cycling from −55°C to +150°C for 1000 cycles, bias humidity at 85°C and 85% RH with 10% power bias for 1000 hours, load life at rated voltage for 1000 hours, vibration, moisture resistance, resistance to solder heat, and solderability. All tests reference JIS C5201, JESD22-A104, and MIL-STD-202 methods as applicable. Components are supplied in tape and reel on 7-inch reels using 8 mm, 12 mm, or 24 mm tape widths, with quantities ranging from 500 pieces per reel for the 4527 series to 4000 pieces per reel for the 1206, 2512, and 2010 packages.
LRA Series AEC-Q200 Metal Alloy Low-Resistance Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: LRA
Resistor type: AEC-Q200 Metal alloy
Description: Low resistance
Power Rating: 0.5W~5W
Resistance (Ω): 0.2~300m
Tolerance (%): ±0.5, ±1, ±2, ±5
TCR (ppm/C): 25-175
Applications of the LRA Series AEC-Q200 Metal Alloy Low-Resistance Resistors
Where RARA metal clad resistors are deployed in the field.
-Battery management systems in electric and hybrid vehicles — inline shunt sensing for state-of-charge and state-of-health monitoring of high-voltage lithium-ion battery packs, where AEC-Q200 qualification, low TCR, and tight tolerance are required to maintain current measurement accuracy across the full automotive operating temperature range
-On-board charger and DC-DC converter current measurement — precision sensing of charge and discharge currents in automotive power conversion stages, where the low milliohm resistance minimises conduction loss in the sensing element while delivering the voltage drop required for accurate current feedback
-Power supply current monitoring — inline shunt sensing on the output rails of switched-mode power supplies in server, telecom, and industrial power systems, providing the current feedback signal for regulation loops, overcurrent protection, and power metering functions
LED driver and lighting control circuits — current sense feedback in constant-current LED drivers for automotive exterior lighting, industrial luminaires, and display backlighting, where the low resistance value ensures minimal voltage headroom loss across the shunt in low-voltage drive topologies
-Motor drive and inverter phase current sensing — low-side shunt sensing of motor phase currents in variable-frequency drives, servo amplifiers, and BLDC motor controllers, providing the current feedback for closed-loop torque control, overcurrent detection, and short-circuit protection
-Battery pack protection and cell balancing circuits — current sensing in portable and stationary energy storage systems where the compact 1206 and 2010 footprints allow shunt resistors to be placed directly on cell-level protection PCBs within space-constrained pack assemblies
-Test and measurement instrumentation — reference shunts in precision power analysers, electronic loads, battery testers, and impedance measurement equipment, where the tight initial tolerance and stable TCR of the LRA series support calibrated current measurement across the instrument operating range
-Automotive body control and chassis electronics — current sensing in fuse box current monitoring modules, smart junction boxes, and chassis power distribution units where AEC-Q200 qualification confirms suitability for long-term automotive service environments
Related Products of the LRA Series AEC-Q200 Metal Alloy Low-Resistance Resistors
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.
