ACS756SCA-050B-PFF-T - 50A Bidirectional Hall-Effect Current Sensor | Allegro
Référence : ACS756SCA-050B-PFF-T ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $8.42 | $8,42 |
| 10 | $7.58 | $75,80 |
| 100 | $6.74 | $674,00 |
| 500 | $6.05 | $3 025,00 |
| 1 000 | $5.39 | $5 390,00 |
ACS756SCA-050B-PFF-T Présentation
What is a Hall-effect current sensor? A Hall-effect current sensor is a contactless transducer that uses the Lorentz force on charge carriers in a magnetic field to produce a voltage proportional to the current flowing through an integrated primary conductor. Within the broader IC taxonomy, it belongs to the magnetic-sensor family, sits under the current-sensor sub-family, and ultimately falls within the analog signal-chain / power-management hierarchy. Compared to shunt-resistor + op-amp solutions, integrated Hall-effect sensors provide galvanic isolation (3 kVRMS here), low insertion loss, and a compact single-IC footprint.
Key features include bidirectional current measurement across the full ±50 A range, 1.5 mΩ primary conductor resistance to minimize power loss, factory-trimmed sensitivity and offset for high accuracy, and a monolithic design that eliminates the need for external sense resistors or isolation barriers. The device is internally protected by a 3 kVRMS isolation barrier between the high-current primary loop and the low-voltage analog signal side, allowing direct MCU/ADC interface.
Architecturally, the ACS756SCA-050B-PFF-T integrates the primary current-carrying loop, Hall-effect transducer element, chopper-stabilized signal chain, and output amplifier on a single die. The chopper-stabilization technique cancels the Hall-element's temperature drift and stress-induced offset, yielding a stable ratiometric output centered at VCC/2 = 2.5 V with ±0.65 V full-scale swing at ±50 A (40 mV/A). The PFF lead form provides through-hole strain relief and PCB creepage clearance to support the rated isolation voltage.
Typical applications include motor-control current monitoring in industrial drives, battery-management systems (BMS) for current-in/out measurement, solar inverter input/output sensing, and overload protection in switched-mode power supplies. The bidirectional range is particularly useful for applications where current reverses during normal operation, such as regenerative braking in e-bikes and motor drives.
When designing with this part, place the device so the high-current conductor traces enter and exit the IP+ and IP- pins with adequate copper cross-section. Decouple VCC with a 0.1 µF ceramic capacitor placed within 5 mm of the lead, and add a 1 µF bulk capacitor for noise suppression on the output pin.
This page synthesizes distributor pricing, drop-in same-brand alternatives (other ACS756 temperature grades), and practical design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour ACS756SCA-050B-PFF-T — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ACS756KCA-050B-PFF-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ACS756SCB-050B-PFF-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ACS756SCA-100B-PFF-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ACS756KCB-050B-PFF-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ACS756SCA-050B-PFF-T Valeurs maximales et caractéristiques électriques
| Type de capteur | Hall Effect, Open Loop |
| Number of Channels | 1 |
| For Measuring | AC/DC |
| Current - Sensing | 50 A (bidirectional, ±50 A) |
| Sensitivity | 40 mV/A |
| Type de sortie | Ratiometric, Voltage |
| Supply Voltage (VCC) | 3 V to 5 V (5 V typical) |
| Current - Supply (Max) | 14 mA |
| Frequency Bandwidth | DC to 120 kHz |
| Response Time | 3 µs typical |
| Primary Conductor Resistance | 1.5 mΩ typical |
| Voltage Isolation (RMS) | 3 kVRMS |
| Operating Temperature Range (S1) | -20°C to +85°C |
| Boîtier | 5-CA Formed Leads (PFF), through-hole |
| Type de montage | Through Hole |
| Polarization | Bidirectional |
| Statut RoHS | Compliant |
Configuration des broches de ACS756SCA-050B-PFF-T
| Broche 1 | IP+ — Primary current input (high-current path) |
| Broche 2 | IP- — Primary current output (high-current path) |
| Broche 3 | VCC — 5 V supply voltage |
| Broche 4 | VOUT — Ratiometric analog output (0.5 V to 4.5 V) |
| Broche 5 | GND — Signal ground |
Applications typiques
ACS756SCA-050B-PFF-T convient pour 6 applications: Industrial Motor Control Current Monitoring, Battery Management System (BMS) Current Sensing, Solar Inverter Input/Output Current Sensing, Switched-Mode Power Supply Overload Protection, Electric Vehicle (e-Bike/Scooter) Drive Monitoring, Uninterruptible Power Supply (UPS) Battery Monitoring.
Industrial Motor Control Current Monitoring
The ACS756SCA-050B-PFF-T is well suited for closed-loop current monitoring in industrial BLDC and PMSM motor drives up to 50 A continuous per phase. Its 120 kHz bandwidth captures the PWM switching edge with less than 3 µs delay, enabling precise torque-loop feedback at 20 kHz PWM frequencies. The 40 mV/A sensitivity and ratiometric output interface directly to a 3.3 V ADC, while the 3 kVRMS isolation barrier satisfies IEC 61800-5-1 reinforced insulation between the high-voltage drive stage and the low-voltage control logic. Compared to a discrete shunt-resistor + isolated-amplifier solution, the integrated ACS756 reduces PCB area by roughly 60% and eliminates calibration of the analog front-end.
Recommandé
Battery Management System (BMS) Current Sensing
The bidirectional ±50 A sensing range of the ACS756SCA-050B-PFF-T matches the charge/discharge current profile of 48 V e-mobility battery packs, e-bikes, and small UPS systems. Its 0.5 V to 4.5 V output centered at 2.5 V provides direct MCU ADC read of net current flow direction without external signal conditioning, while the 1.5 mΩ primary resistance introduces less than 200 mW of insertion loss at 10 A - critical for round-trip efficiency calculations. The Hall-effect isolation eliminates ground-loop issues between the battery stack and the low-voltage BMS controller. Unlike isolated shunt-based solutions, the integrated package is a single component, reducing BOM count.
Recommandé
Solar Inverter Input/Output Current Sensing
In residential and small-commercial solar inverters, the ACS756SCA-050B-PFF-T monitors both the PV input current and the grid-tie output current up to 50 A. The 120 kHz bandwidth tracks the 50/60 Hz grid fundamental plus harmonic content with negligible phase delay, while the 3 kVRMS isolation barrier provides the reinforced insulation required by IEC 62109 between the DC bus and the AC mains interface. Ratiometric output simplifies temperature compensation by referencing to VCC, and the 14 mA quiescent current is acceptable in always-on solar applications where standby losses matter. The bidirectional range is ideal for hybrid inverters where current reverses during battery charging from PV excess.
Recommandé
Switched-Mode Power Supply Overload Protection
The ACS756SCA-050B-PFF-T provides cycle-by-cycle overcurrent detection in telecom and server SMPS modules rated up to 50 A. Its 3 µs response time trips protection circuitry faster than most digital supervisor ICs, preventing inductor saturation and MOSFET thermal runaway during load-step transients. The 5 V single-supply operation matches standard SMPS housekeeping rails, while the 3 kVRMS isolation allows the sensor to sit on the primary-side high-voltage bus with the output feeding an optocoupler for safety-isolated feedback. The integrated Hall-effect approach avoids the high-side shunt amplifier bootstrap supply complexity required in discrete solutions.
Recommandé
Electric Vehicle (e-Bike/Scooter) Drive Monitoring
In e-bike and light-electric-vehicle traction drives, the ACS756SCA-050B-PFF-T senses motor phase current for torque control and regenerative-braking energy recovery. The bidirectional ±50 A range covers the 20-40 A peak currents typical of 250-750 W hub motors, with 40 mV/A providing approximately 8 mV/A resolution at the ADC - sufficient for current-mode control loops. The Hall-effect isolation eliminates ground loops between the battery-side motor controller and chassis-mounted accessories. Compared to a 50 A shunt resistor, the ACS756's 1.5 mΩ primary path dissipates 75% less heat (3.75 W vs 12.5 W at 50 A), improving drive efficiency.
Recommandé
Uninterruptible Power Supply (UPS) Battery Monitoring
The ACS756SCA-050B-PFF-T monitors DC battery charge/discharge current in 12 V to 48 V UPS systems up to 50 A. Its bidirectional range captures the full charge-discharge cycle including float-charge leakage currents at high sensitivity. The 3 kVRMS isolation barrier provides reinforced insulation between the battery stack and the user-accessible control interface, meeting IEC 62040-1 safety requirements. The Hall-effect sensor's inherent AC rejection helps ignore switching-noise transients from the inverter, while the 120 kHz bandwidth tracks the charge-controller PWM current ripple for accurate coulomb-counting. Compared to optocoupler-isolated shunt solutions, the ACS756 reduces assembly steps and improves long-term calibration stability.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ACS756SCA-050B-PFF-T — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ACS756KCA-050B-PFF-T | ACS756SCB-050B-PFF-T | ACS756SCA-100B-PFF-T | ACS756KCB-050B-PFF-T |
|---|---|---|---|---|---|
| Package | 5-CA Formed Leads (PFF), through-hole | 5-CA Formed Leads (PFF) - same | 5-CA Formed Leads (PFF) - same | 5-CA Formed Leads (PFF) - same | 5-CA Formed Leads (PFF) - same |
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Current Sensing Range | ±50 A | ±50 A | ±50 A | ±100 A | ±50 A |
| Sensitivity | 40 mV/A | 40 mV/A | 40 mV/A | 20 mV/A | 40 mV/A |
| Operating Temperature Range | -20°C to +85°C | -40°C to +125°C | -40°C to +150°C | -20°C to +85°C | -40°C to +125°C |
| Bandwidth | 120 kHz | 120 kHz | 120 kHz | 120 kHz | 120 kHz |
| Voltage Isolation | 3 kVRMS | 3 kVRMS | 3 kVRMS | 3 kVRMS | 3 kVRMS |
| Primary Conductor Resistance | 1.5 mΩ | 1.5 mΩ | 1.5 mΩ | 1.5 mΩ | 1.5 mΩ |
| Supply Current (Max) | 14 mA | 14 mA | 14 mA | 14 mA | 14 mA |
Principaux différenciateurs
- Industry-standard 3 kVRMS reinforced isolation in compact 5-pin CA package (vs ACS756SCA-100B-PFF-T)
- Higher current resolution at low currents vs higher-range variants (vs ACS756SCA-100B-PFF-T)
- Lower cost vs automotive-grade same-range parts (vs ACS756KCA-050B-PFF-T)
Notes de conception
Route the high-current primary path (IP+ to IP-) with adequate copper cross-section: at 50 A continuous, use at least 100 mm² (4 oz copper) on outer layers to keep trace temperature rise below 30°C. According to Allegro datasheet, the primary conductor is internally connected between pins 1 and 2 - keep these traces short and wide, and use thermal vias to inner copper planes for heat spreading. Maintain 8 mm minimum creepage distance on the PCB surface between the primary loop and the signal-side traces to preserve the 3 kVRMS isolation rating.
Decouple VCC with a 0.1 µF X7R ceramic capacitor placed within 5 mm of pin 3, and add a 1 µF bulk capacitor in parallel for high-frequency noise suppression. According to Allegro datasheet, VCC ripple above 50 mVpk-pk couples into the output through the ratiometric reference, so use a clean 5 V LDO (not a switching regulator output) when the sensor is fed from the system 5 V rail. Add an RC low-pass filter (1 kΩ + 100 nF) on VOUT if the downstream ADC input has wideband noise.
Estimated: at 50 A continuous primary current, the 1.5 mΩ primary conductor dissipates P = I²R = 50² × 0.0015 = 3.75 W. With the package mounted on 100 mm² of 4-layer 2 oz copper, the expected junction-to-ambient thermal resistance is approximately 25 °C/W, yielding a 94 °C rise above 25 °C ambient - acceptable for the -20°C to +85°C SCA grade. For higher ambient (>60°C) or continuous >50 A operation, derate to 40 A or migrate to the SCB high-temperature grade.
The chopper-stabilized Hall element produces a ratiometric output referenced to VCC/2 (2.5 V at 5 V supply). If the ADC reference is tied to VCC, the measurement becomes insensitive to supply-voltage variation. According to Allegro datasheet, output step response settles within 3 µs for a step input, but the first-stage chopper introduces a small residual ripple at the chopper frequency (~100 kHz) - low-pass filter the output with fc = 10 kHz for precision DC measurements, or sample at 4× chopper frequency if capturing AC waveforms above 10 kHz.
Informations de conformité
RoHS compliant per Allegro product page. UL 60950-1 recognized for reinforced insulation up to 3 kVRMS. Not AEC-Q100 qualified - choose KCA or SCB grade for automotive.
