ACS70331EOLCTR-005U3 - 5A GMR Unidirectional Current Sensor | Allegro
N.º de pieza: ACS70331EOLCTR-005U3 ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.51 | $2,51 |
| 10 | $2.27 | $22,70 |
| 100 | $1.94 | $194,00 |
| 500 | $1.62 | $810,00 |
| 1.000 | $1.41 | $1.410,00 |
ACS70331EOLCTR-005U3 Descripción general
A current sensor IC is a transducer that converts the magnetic field produced by a primary current into a proportional analog voltage or current output, allowing a microcontroller or ADC to monitor system power consumption without inserting a shunt resistor in the load path. The ACS70331 belongs to the integrated current sensor category (current sensor IC > magnetic current sensor > GMR current sensor > power monitoring IC > analog sensor IC > semiconductor). Compared with traditional Hall-effect ICs, GMR-based sensors offer much higher sensitivity (mV/A), lower noise, and faster response, which is particularly important for detecting fast load transients in motor drives, battery management, and point-of-load monitoring.
Key features include: a 5 A primary current range optimized for low-current applications; GMR-based sensing providing approximately 25x the sensitivity of Hall-effect sensors; a typical response time of 535 ns; a low-noise analog ratiometric output proportional to primary current; and factory-trimmed sensitivity/offset to reduce external calibration. The 8-pin SOIC surface-mount package has a low thermal profile and supports automated assembly. The device's footprint and pinout are footprint-compatible with the bidirectional (B-suffix) variants in the same family.
Typical applications include battery monitoring in handheld and IoT devices, USB-C current monitoring, point-of-load monitoring on 3.3 V rails, small motor and fan current monitoring, and low-side/high-side current sensing in compact power-conversion stages. The unidirectional (U3) variant is intended for monitoring current flowing in one direction only, whereas the bidirectional (B3/B5) variants are suited for charge/discharge monitoring such as USB-PD current advertisement.
When designing with this part, ensure the primary current path is routed through the integrated SOIC-8 lead frame (per Allegro's recommended PCB layout). Decouple VCC with a local 0.1 microfarad ceramic capacitor placed close to the supply pin. Account for ratiometric output scaling when using an ADC reference tied to the same 3.3 V rail.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives in the same SOIC-8 footprint, and practical PCB layout notes not all consolidated in a single manufacturer resource.
Alternativas directas para ACS70331EOLCTR-005U3 — 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:
ACS70331EOLCTR-005B3
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ACS70331EOLCTR-005U5
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ACS70331EOLCTR-005B5
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ACS70331EOLCTR-005U3-T
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ACS70331EOLCTR-005U3-REEL
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ACS70331EOLCTR-005U5-REEL
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ACS70331EOLCTR-005U3 Valores máximos y características eléctricas
| Tipo de sensor | Current Sensor, GMR (Giant Magnetoresistive) |
| Number of Channels | 1 |
| Primary Current Range | 5 A |
| Current Direction | Unidirectional |
| Sensitivity Suffix | 005U3 (5 A, Unidirectional, code U3) |
| Tipo de salida | Analog, ratiometric |
| Bandwidth | 1 MHz |
| Response Time (typical) | 535 ns |
| Tensión de alimentación | 3.3 V |
| Technology | GMR (approximately 25x sensitivity vs Hall-effect sensors per manufacturer claim) |
| Encapsulado | 8-SOIC (0.154", 3.90 mm Width) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant (per distributor listings) |
| Estado del ciclo de vida | NRND per Mouser listing |
| Factory Sensitivity/Offset Trim | Yes (programmed at Allegro factory) |
Configuración de pines de ACS70331EOLCTR-005U3
| Pin 1 | VCC — 3.3 V supply voltage input |
| Pin 2 | GND — Ground reference |
| Pin 3 | OUT — Analog ratiometric output proportional to primary current |
| Pin 4 | FILTER — External filter capacitor for output bandwidth setting |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | IP+ — Primary current input (high-side of integrated lead frame) |
| Pin 7 | IP- — Primary current output (low-side of integrated lead frame) |
| Pin 8 | NC — Not connected (per datasheet) |
Aplicaciones típicas
ACS70331EOLCTR-005U3 es adecuado para 6 aplicacións: USB-C / USB-PD Current Monitoring, Battery Monitoring in IoT / Handheld Devices, Small Motor and Fan Current Sensing, Point-of-Load (POL) Current Monitoring, Solar Microinverter and Energy Harvesting Telemetry, Industrial 4-20 mA Loop and Process Control Monitoring.
USB-C / USB-PD Current Monitoring
The ACS70331EOLCTR-005U3 fits USB-C current monitoring because its 5 A primary range covers USB-PD 5 V/3 A advertisement and its 1 MHz bandwidth tracks the fast PD current-step transitions. The GMR technology is approximately 25 times more sensitive than Hall-effect sensors per the Allegro product page, so a single integrated SOIC-8 device delivers an analog output proportional to bus current without an external shunt. Place the part in line with VBUS and decouple VCC with a 0.1 microfarad ceramic capacitor; the ratiometric output lets the MCU ADC share the 3.3 V reference. The unidirectional U3 trim is suited for source-mode current advertisement, while the B3 bidirectional trim is preferred for sink-side role-swap measurements.
Recomendado
Battery Monitoring in IoT / Handheld Devices
The ACS70331EOLCTR-005U3 is well-suited to battery monitoring in IoT and handheld devices where sub-5 A load currents must be measured with high accuracy and low quiescent draw. Per the Allegro ACS70331 family description, the GMR sensing element provides approximately 25 times the sensitivity of Hall-effect ICs, allowing a precise mV/A output at very low primary currents without amplification. The 3.3 V single-rail supply matches typical Li-ion PMIC outputs, and the 1 MHz bandwidth captures dynamic load steps from radios and displays. Use the unidirectional U3 trim for discharge-only monitoring; pair with the bidirectional B3 trim if charge/discharge telemetry is required.
Recomendado
Small Motor and Fan Current Sensing
The ACS70331EOLCTR-005U3 supports small motor and fan current sensing thanks to its 5 A primary range, 1 MHz bandwidth, and 535 ns typical response time. The 1 MHz capability captures PWM chopping edges of brushless-DC and small stepper drives, allowing the controller to detect stall or overload conditions within microseconds. Allegro states GMR technology is approximately 25 times more sensitive than conventional Hall-effect sensors, so even fractional-ampere operating points produce a usable analog swing. Route the motor phase conductor through the integrated SOIC-8 lead frame per the datasheet layout guide, and add an RC output filter if PWM switching noise contaminates the analog output.
Recomendado
Point-of-Load (POL) Current Monitoring
The ACS70331EOLCTR-005U3 is appropriate for point-of-load monitoring on 3.3 V rails, including POL converter output validation and dynamic load-step telemetry. The 1 MHz bandwidth exceeds the bandwidth of typical POL converters, ensuring the analog output accurately reproduces the converter's load-step response. Per Allegro, GMR technology is approximately 25 times more sensitive than Hall-effect sensors, so the 5 A range delivers high resolution at sub-ampere telemetry points common on POL rails. The SOIC-8 footprint routes the primary current through the integrated lead frame, eliminating external shunts and reducing PCB parasitic inductance.
Recomendado
Solar Microinverter and Energy Harvesting Telemetry
The ACS70331EOLCTR-005U3 is appropriate for solar microinverter and energy-harvesting telemetry where sub-5 A currents must be measured with high sensitivity. Per the Allegro product page, GMR technology is approximately 25 times more sensitive than Hall-effect sensors, enabling precise telemetry at low photovoltaic panel output currents and at low ambient-light harvesting levels. The unidirectional U3 trim aligns with one-way energy flow from panel to battery; the 1 MHz bandwidth captures MPPT perturbation transients. The SOIC-8 surface-mount package supports automated assembly of compact outdoor power modules.
Recomendado
Industrial 4-20 mA Loop and Process Control Monitoring
The ACS70331EOLCTR-005U3 can monitor the 4-20 mA loop return path and other low-current industrial control signals with high accuracy. Per Allegro, GMR sensing is approximately 25 times more sensitive than Hall-effect sensors, so fractional-ampere loop currents produce a usable analog swing without amplification. The 5 A range covers the loop return plus common-mode margins. The 1 MHz bandwidth tracks solenoid and valve actuation transients, enabling closed-loop diagnostics. Although the part is marked NRND by Mouser, in-stock distributor inventory remains available; for new industrial designs consider Allegro's active ACS37800KMACTR-090B3-I2C as an alternative with integrated I2C interface.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ACS70331EOLCTR-005U3 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ACS70331EOLCTR-005B3 | ACS70331EOLCTR-005U5 | ACS70331EOLCTR-005B5 | ACS70331EOLCTR-005U5-REEL |
|---|---|---|---|---|---|
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Package | 8-SOIC (0.154", 3.90 mm) | 8-SOIC (same footprint) | 8-SOIC (same footprint) | 8-SOIC (same footprint) | 8-SOIC (same footprint) |
| Primary Current Range | 5 A unidirectional | 5 A bidirectional | 5 A unidirectional (U5) | 5 A bidirectional (B5) | 5 A unidirectional (U5) |
| Output Type | Analog ratiometric, unidirectional (U3) | Analog ratiometric, bidirectional (B3) | Analog ratiometric, unidirectional (U5) | Analog ratiometric, bidirectional (B5) | Analog ratiometric, unidirectional (U5) |
| Bandwidth | 1 MHz | 1 MHz | 1 MHz | 1 MHz | 1 MHz |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Technology | GMR (~25x Hall sensitivity) | GMR (~25x Hall sensitivity) | GMR (~25x Hall sensitivity) | GMR (~25x Hall sensitivity) | GMR (~25x Hall sensitivity) |
| Response Time (typical) | 535 ns | 535 ns | 535 ns | 535 ns | 535 ns |
| Lifecycle Status | NRND (Mouser) | NRND | NRND | NRND | NRND |
Diferenciadores clave
- GMR sensing offers approximately 25x the sensitivity of Hall-effect sensors (frente a Generic SOIC-8 Hall-effect current sensor ICs)
- 1 MHz bandwidth with 535 ns typical response time (frente a Typical Hall-effect ICs in SOIC-8 with 100-200 kHz bandwidth)
- Factory-trimmed sensitivity and offset variants (U3/U5/B3/B5) (frente a Untrimmed Hall-effect ICs requiring external calibration)
Notas de diseño
Per Allegro's recommended layout, route the primary current path through the integrated SOIC-8 lead frame (pins 6 and 7 on the IP+/IP- side) and keep high-current traces wide and short to minimize parasitic resistance. Place a 0.1 microfarad ceramic decoupling capacitor as close as possible to the VCC pin (pin 1) and connect the GND pin (pin 2) directly to a low-impedance ground plane. The SOIC-8 package's thermal pad is not electrically connected; do not use it as a current path. Maintain creepage and clearance appropriate to the application's working voltage, since primary current traces are at the system bus potential rather than at the IC's 3.3 V domain.
The 1 MHz analog output is susceptible to noise coupling from nearby switching nodes. Place the output RC filter capacitor on the FILTER pin (pin 4) close to the IC to set the desired response time and bandwidth; typical Allegro evaluation board values are in the 1-10 nanofarad range. Keep the OUT pin (pin 3) trace short and guarded with a ground pour on both sides. If the application environment contains high dV/dt nodes (MOSFET switching, RF transmitters), add a small ferrite in the supply line and ensure the analog return path shares the same ground as the ADC reference to avoid ground-loop errors in ratiometric ADC sampling.
Estimated: when sampling the analog output with an ADC, share the same 3.3 V rail between VCC and the ADC reference to preserve ratiometric accuracy. Mis-wiring IP+ and IP- will not damage the device but will invert the output polarity, causing the U3 unidirectional trim to read near-zero for forward current. Do not exceed 5 A continuous primary current without derating for ambient temperature. Because Mouser marks this part NRND, design in a second-source path: Allegro's ACS37800KMACTR-090B3-I2C (in the XAIPART Site MPN list) is an active alternative that uses I2C rather than analog output, so reserve PCB space for an optional footprint if a migration is anticipated.
Información de cumplimiento
RoHS compliance and lead-free confirmed by distributor listings (DigiKey, Mouser, LCSC). REACH, halogen-free, and conflict-minerals declarations not present in verified distributor data; consult Allegro material declarations for authoritative status. AEC-Q100 not applicable to this industrial/consumer GMR part.
