WSR35L000FEA - 5 mOhm 3W Current Sense Resistor 4527 | Vishay
N.º de pieza: WSR35L000FEA ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.62 | $16,20 |
| 100 | $1.35 | $135,00 |
| 500 | $1.1 | $550,00 |
| 1.000 | $0.92 | $920,00 |
WSR35L000FEA Descripción general
A current-sense resistor is a low-value, precision resistor placed in series with a current path so that the voltage drop across it (V = I × R) can be measured by an amplifier or ADC to infer the load current. This category is part of the passive components family, sitting alongside standard resistors in the surface-mount taxonomy: chip resistor -> current-sense resistor -> metal-strip current-sense resistor -> power current-sense resistor. Power Metal Strip technology uses a proprietary welded metal-alloy resistance element that achieves very low resistance values (down to 0.001 ohm) with excellent pulse-withstanding capability, making it ideal for high-current monitoring.
Key specifications include 0.005 ohm resistance (5 milliohnse), ±1% tolerance for accurate current measurement, 3 W power rating at 70 °C derated to zero at 275 °C, ±110 ppm/°C TCR for stable readings across operating temperature, and a 4-terminal (Kelvin) J-Lead layout that minimizes the influence of lead resistance on measurement accuracy. Anti-sulfur construction protects the metal element from sulfur-induced corrosion, critical in industrial and automotive environments where sulfur contamination is common.
The WSR35L000FEA uses an all-welded construction of a precision-rolled metal alloy strip molded in a high-temperature thermoset compound, providing pulse-withstanding performance equivalent to wirewound resistors while maintaining the low-inductance characteristics required for switching-converter current waveforms. The 4-terminal J-Lead footprint (two pads for current flow, two pads for voltage sensing) allows true Kelvin connection on the PCB, eliminating parasitic voltage drops in the high-current path from contaminating the sense voltage.
Typical applications include DC-DC converter current feedback in switch-mode power supplies, battery management system (BMS) current monitoring, motor control phase-current sensing in BLDC drivers, automotive ECU power monitoring, and load monitoring in power distribution systems. The AEC-Q200 qualification allows deployment under the hood, in chassis modules, and in other automotive stress environments.
When designing with this part, route the sense traces as a true 4-wire Kelvin connection back to the amplifier, keep the current-carrying traces wide enough to carry full load without significant IR rise, and verify the PCB land pattern against the J-Lead footprint shown in the Vishay WSR series datasheet.
This page synthesizes distributor pricing from DigiKey and Mouser, AEC-Q200 qualification status, design notes, and drop-in alternative candidates not found in the manufacturer catalog alone.
Alternativas directas para WSR35L000FEA — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
WSR25L000FEA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
WSR5R000FEA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
WSR3R000FEA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
WSR35L000FEK
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
WSR35L000FTA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
WSR35L000FEA Valores máximos y características eléctricas
| Resistance | 0.005 ohm (5 mOhm) |
| Tolerance | ±1% |
| Power Rating | 3 W |
| Temperature Coefficient | ±110 ppm/°C |
| Encapsulado / Carcasa | 4527 J-Lead (SMD) |
| Package Size | 11.56 mm x 7.49 mm |
| Composition | Metal Element (Power Metal Strip) |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -65 °C to +275 °C |
| Características | Anti-Sulfur, AEC-Q200 Automotive, Current Sense, Moisture Resistant, Pulse Withstanding |
| Construction | Molded high-temperature encapsulation, all-welded metal element |
| Packaging | Tape & Reel (Digi-Reel) |
| Lead Style | J-Lead (4-terminal Kelvin connection) |
| Estado RoHS | Compliant |
| AEC-Q200 Qualification | Qualified |
Configuración de pines de WSR35L000FEA
| Pin 1 | I+ (Current In) — High-current input terminal (J-Lead pad) |
| Pin 2 | I- (Current Out) — High-current output terminal (J-Lead pad) |
| Pin 3 | S+ (Sense +) — Voltage sense terminal (Kelvin, J-Lead pad) |
| Pin 4 | S- (Sense -) — Voltage sense terminal (Kelvin, J-Lead pad) |
Aplicaciones típicas
WSR35L000FEA es adecuado para 6 aplicacións: DC-DC Converter Current Feedback, Battery Management System (BMS) Current Monitoring, BLDC Motor Phase Current Sensing, Automotive ECU Power Monitoring, Industrial Power Distribution Load Monitoring, Server and Telecom Hot-Swap Controller.
DC-DC Converter Current Feedback
The WSR35L000FEA serves as the low-side current-sense resistor in buck, boost, and buck-boost switch-mode power supplies, where its 0.005 ohm resistance generates a clean, low-noise sense voltage proportional to inductor current. With ±1% tolerance and ±110 ppm/°C TCR, the part provides the accuracy required for peak-current-mode and average-current-mode control loops. The 4-terminal Kelvin J-Lead layout eliminates parasitic PCB trace resistance from corrupting the sense signal, while the 3 W power rating handles continuous load currents up to approximately 24 A (24^2 × 0.005 = 2.88 W). At 10 A continuous current the WSR35L000FEA dissipates only 0.5 W, leaving substantial thermal margin. AEC-Q200 qualification enables deployment in automotive power converters.
Recomendado
Battery Management System (BMS) Current Monitoring
The WSR35L000FEA is placed in the high-current path of a battery pack or BMS to provide coulomb-counting and short-circuit detection. Its 0.005 ohm resistance produces 50 mV at 10 A discharge - within the common-mode range of most battery-monitoring ADCs after amplification - while dissipating only 0.5 W. Anti-sulfur construction protects the metal alloy from sulfur outgassing in sealed battery enclosures, and the -65 °C to +275 °C operating range handles thermal stress during fast-charge. AEC-Q200 qualification supports EV and hybrid-electric battery packs where reliability and traceability are mandatory.
Recomendado
BLDC Motor Phase Current Sensing
In three-phase brushless DC motor drives, the WSR35L000FEA can be used in the low-side return shunt position to sense per-phase current for FOC (field-oriented control) algorithms. Its 4-terminal Kelvin layout preserves switching-edge fidelity at 50 kHz to 100 kHz PWM frequencies, where parasitic inductance in standard 2-terminal shunts would corrupt the sense waveform. The 3 W continuous rating and ±110 ppm/°C TCR deliver stable phase-current measurements across the motor's operating envelope, supporting high-torque transient conditions without saturating the sense amplifier. AEC-Q200 makes the part acceptable for automotive traction and power-steering motors.
Recomendado
Automotive ECU Power Monitoring
Engine control units, transmission control units, and ADAS domain controllers monitor their own supply currents for diagnostics and brownout detection, and the WSR35L000FEA fits this role in 12 V and 48 V automotive rails. Its AEC-Q200 qualification, anti-sulfur construction, and -65 °C to +275 °C range cover under-hood thermal and chemical stress. The 0.005 ohm value delivers measurable signal at typical ECU load currents (1 A to 10 A) without dissipating significant power, while the small 4527 footprint fits on densely populated ECU PCBs alongside MCUs and gate drivers.
Recomendado
Industrial Power Distribution Load Monitoring
In 24 V and 48 V industrial distribution systems, the WSR35L000FEA serves as the per-branch current-sense element for fault detection and load balancing. Its 3 W continuous dissipation supports branch currents up to approximately 24 A while delivering a measurable sense voltage to a downstream ADC or comparator. Pulse-withstanding construction handles motor inrush and solenoid events that would damage ordinary chip resistors, and anti-sulfur chemistry protects the metal element from sulfur exposure in factory-floor environments. The molded 4527 J-Lead package withstands wave-solder and reflow processes on standard SMT lines.
Recomendado
Server and Telecom Hot-Swap Controller
In -48 V telecom and 12 V server hot-swap controllers, the WSR35L000FEA provides the current-sense feedback that the hot-swap controller uses to limit inrush and detect overcurrent. Its low 0.005 ohm value minimizes voltage drop in the high-current rail (250 mV at 50 A), while the 3 W rating handles continuous server and switch load currents. The 4-terminal Kelvin layout is essential at these high currents where PCB trace resistance in milliohms would otherwise corrupt the sense signal and cause false overcurrent trips.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para WSR35L000FEA — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | WSR25L000FEA | WSR5R000FEA | WSR3R000FEA | WSR35L000FEK | WSR35L000FTA |
|---|---|---|---|---|---|---|
| Brand | Vishay | Vishay | Vishay | Vishay | Vishay | Vishay |
| Package | 4527 J-Lead | 4527 J-Lead - same | 4527 J-Lead - same | 4527 J-Lead - same | 4527 J-Lead - same | 4527 J-Lead - same |
| Resistance | 0.005 ohm | 0.002 ohm | 0.005 ohm | 0.003 ohm | 0.005 ohm | 0.005 ohm |
| Tolerance | ±1% | ±1% | ±1% | ±1% | ±1% | ±1% |
| Power Rating | 3 W | 3 W | 5 W | 3 W | 3 W | 3 W |
| TCR | ±110 ppm/°C | ±110 ppm/°C | ±110 ppm/°C | ±110 ppm/°C | ±110 ppm/°C | ±110 ppm/°C |
| AEC-Q200 | Yes | Yes | Yes | Yes | Yes | Yes |
| Anti-Sulfur | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -65 °C to +275 °C | -65 °C to +275 °C | -65 °C to +275 °C | -65 °C to +275 °C | -65 °C to +275 °C | -65 °C to +275 °C |
Diferenciadores clave
- AEC-Q200 automotive qualification with anti-sulfur construction (frente a WSR25L000FEA)
- 3 W continuous rating in 4527 J-Lead (frente a WSR3R000FEA)
- Lower cost than higher-power WSR5R000FEA (frente a WSR5R000FEA)
Notas de diseño
Route the sense pads (S+ and S-) as a true Kelvin connection back to the amplifier or ADC input - the high-current pads (I+ and I-) carry the load current and must not share the sense voltage path. Keep the sense traces parallel and matched in length to minimize common-mode noise pickup, and place the amplifier within 5-10 mm of the sense pads to avoid ground-loop errors. The 4-terminal J-Lead footprint enables this layout when the PCB pad geometry follows the datasheet recommendation.
At continuous 24 A load the WSR35L000FEA dissipates I²R = 24² × 0.005 = 2.88 W, approaching the 3 W rating. Provide at least 100 mm² of copper pour (1 oz copper) under the J-Lead pads to spread heat into the PCB, and avoid placing thermal-sensitive components within 5 mm of the resistor. At higher transient currents the pulse-withstanding rating provides margin, but verify with the Vishay pulse-energy curves in the WSR datasheet.
Do not use a 2-terminal footprint (only I+ and I- pads) for the WSR35L000FEA - the sense voltage will include PCB trace resistance and produce inaccurate current readings. Do not bypass the four pads with copper on inner layers, which would short the Kelvin connection. Verify the AEC-Q200 lot code is required for the target automotive subsystem, and confirm the reel orientation matches the pick-and-place feeder before production runs.
Información de cumplimiento
AEC-Q200 (automotive passive component) qualified per DigiKey and Mouser listings and Vishay WSR family documentation. RoHS and lead-free compliant per Vishay product family datasheet. Halogen_free status not explicitly stated in verified web data.
