Inicio > Circuitos integrados IC > ULR1-R0025FT2

ULR1-R0025FT2

2.5mOhm metal alloy current sense resistor, 1%, 1W, 2512, +/-50ppm/C, AEC-Q200

9408

Inventario efectivo

Ir a la consulta

Image for reference only

Pieza del fabricante：

ULR1-R0025FT2

Paquete：

2512 (6.35 x 3.18 x 0.65 mm)

Descripción

Productos

The ULR1-R0025FT2 is a Tt Electronics product designed for electronic applications. It features compact design with reliable performance characteristics suitable for various industrial and consumer applications.

Especificaciones

Tipo	Metal Alloy Current Sense Resistor
Resistance	2.5 mOhm
Tolerance	+/- 1%
Power Rating	1W
Temperature Coefficient	+/- 50 ppm/C
Max Working Voltage	N/A (current sense)
Max Current	20A (calculated)
Technology	Bulk metal alloy
Series	ULR
Paquete	2512 [6432 Metric]
Dimensions	6.35 x 3.18 x 0.65 mm
Temperatura de funcionamiento	-55 C to +170 C
Inductance	< 5 nH (Typ)
Cualificación	AEC-Q200

Características

Ultra-low 2.5 mOhm resistance for high-current sensing; Bulk metal alloy element for low TCR and high stability; +/-1% tolerance for accurate current measurement; 1W power rating in 2512 package; Low TCR of +/-50 ppm/C over full temperature range; Very low inductance (<5 nh) for high-frequency current sensing; aec-q200 qualified automotive applications; 4-terminal (kelvin) pad layout accurate solder-plated terminations; rohs compliant

Aplicaciones

DC-DC converter current sensing; Battery management system current monitoring; Motor drive overcurrent protection; Power supply current limiting; Automotive current measurement; Server and datacenter power; Inverter current feedback; Hot-swap and ORing circuits

Introducción del producto:ULR1-R0025FT2 Presentación del producto

The ULR1-R0025FT2 from TT Electronics (Welwyn) is a 2.5 mOhm metal alloy current sense resistor from the ULR series, offering +/-1% tolerance and a low temperature coefficient of +/-50 ppm/C in a 2512 (6.35 x 3.18 mm) surface-mount package. The bulk metal alloy resistive element provides superior performance compared to thick film or metal strip alternatives, with extremely low inductance (<5 nH typical) making it suitable for high-frequency switching applications such as DC-DC converters and motor drives. The 4-terminal (Kelvin) pad layout enables accurate voltage measurement across the sense element by separating the current path from the voltage sensing path, eliminating the error caused by solder joint and trace resistance. AEC-Q200 qualified, the ULR1-R0025FT2 is designed for automotive current sensing applications including battery management systems, motor drives, and power distribution. With a 1W power rating and operating temperature range of -55C to +170C, the device can handle continuous currents up to 20A while maintaining measurement accuracy.

Principio de funcionamiento:ULR1-R0025FT2 Principio de funcionamiento

The ULR1-R0025FT2 operates as a precision shunt resistor where current flowing through the 2.5 mOhm resistive element produces a proportional voltage drop according to Ohm’s law (V = I x R). For a 10A load current, the voltage drop across the sense resistor is 25 mV, which can be amplified by a current sense amplifier or measured directly by an ADC. The bulk metal alloy element is a solid piece of resistive metal (typically manganese-copper or nickel-chromium alloy) that provides inherent stability and very low inductance compared to spiral or etched trace constructions. The 4-terminal (Kelvin) connection separates the high-current path (force terminals) from the voltage measurement path (sense terminals), eliminating the voltage drop across the solder joints and PCB traces that would otherwise introduce measurement error. The +/-50 ppm/C TCR ensures that the resistance value changes by less than 0.01% per degree Celsius, maintaining measurement accuracy over the full automotive temperature range. The extremely low inductance (<5 nH) ensures that the resistive impedance dominates even at the high switching frequencies used in modern DC-DC converters (hundreds of kHz to MHz), preventing reactive errors in the current measurement.

Descripción de la clavija:ULR1-R0025FT2 Definición y funciones de las clavijas

Terminal	Nombre	Tipo	Función
1	I+ (Force+)	Current	Current input terminal; carries the load current through the sense element
1	V+ (Sense+)	Tensión	Kelvin sense terminal; measures voltage at the positive side of the resistive element (separate pad from force)
2	I- (Force-)	Current	Current output terminal; carries the load current away from the sense element
2	V- (Sense-)	Tensión	Kelvin sense terminal; measures voltage at the negative side of the resistive element (separate pad from force)

Application Scenarios:In which products and applications isULR1-R0025FT2 usado

Battery Management Systems: Measures charge and discharge currents in EV battery packs with 2.5 mOhm minimizing power loss at high currents.
DC-DC Converter Current Mode Control: Provides cycle-by-cycle current feedback in buck/boost converters with <5 nH inductance preserving measurement accuracy at MHz switching frequencies.
Motor Drive Overcurrent: Detects overcurrent conditions in BLDC motor drives with AEC-Q200 qualification for automotive environments.
Server Power Distribution: Monitors current in datacenter power supply rails with Kelvin connection ensuring accurate measurement despite high-current solder joint resistance.

Alternative Models:What chips are recommended as replacements for ULR1-R0025FT2

Fabricante	Número de pieza	Paquete	Resistance	Notas
Vishay	WSL2512R0025FEA	2512	2.5 mOhm	Metal strip, 1%, 1W, AEC-Q200
Bourns	CST2512-2M5	2512	2.5 mOhm	Metal alloy, 1%, 1W
ROHM	PSR2512-2M5	2512	2.5 mOhm	Metal plate, 1%, 1W
Isabellenhuette	SMS-R002-1.0	2512	2 mOhm	Higher power (5W), similar application