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Allegro MicroSystems ACS70311LOKATX-005B5-C
- Part No.:
- ACS70311LOKATX-005B5-C
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 4-SSIP Formed Leads
- Datasheet:
-
ACS70311LOKATX-005B5-C.pdf
- Description:
- HIGHEST ACCURACY PROGRAMMABLE LI
- Quantity:
- Payment:
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Product details
Overview
ACS70311LOKATX-005B5-C from Allegro MicroSystems is a programmable, bidirectional, high-bandwidth Hall-effect current sensor IC designed for core-based current sensing in automotive inverters and DC-DC converters. It delivers factory-programmed 5 mV/G sensitivity, ±1% sensitivity error, ±5 mV offset error over –40°C to 150°C, and integrates undervoltage detection (UVD) and low-voltage programming.
For engineers reviewing the ACS70311LOKATX-005B5-C datasheet, ACS70311LOKATX-005B5-C pinout, ACS70311LOKATX-005B5-C application, or ACS70311LOKATX-005B5-C equivalent, key selection criteria include UVD functionality, 240 kHz bandwidth, 2 µs response time, OK-package mechanical robustness for current-sensing modules, and customer programmability of offset and sensitivity within ±5.5 mV/G range.
Technical Context
The ACS70311LOKATX-005B5-C implements dynamic offset cancellation, segmented linear temperature compensation, and patented spiking suppression circuits to maintain accuracy under fast current transients. Its on-chip regulator supports ±18 V supply tolerance and reverse-battery protection, while broken-ground detection and output clamps provide automotive-grade diagnostics.
It features EEPROM-based programming logic with 9-bit fine offset and 11-bit total sensitivity control (2 coarse + 9 fine bits), enabling post-manufacturing calibration. The device operates ratiometrically but allows disabling ratiometry for ADC interface flexibility, and its UVD threshold is factory-set at 4.2 V nominal with 250 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | Factory-programmed 5 mV/G, programmable ±0.5 mV/G around nominal; enables precise current scaling in core-based sensing |
| Bandwidth | DC to 240 kHz; supports accurate measurement of high-frequency switching waveforms in SiC/GaN inverters |
| Response Time | 2.1 µs typical; ensures fidelity for fast transient current events without phase lag |
| Operating Temp | –40°C to 150°C ambient; qualified per AEC-Q100 Grade 0 for under-hood automotive use |
| UVD Threshold | 4.2 V nominal with 250 mV hysteresis; triggers diagnostic flag before system brownout affects control loop |
| Supply Range | 4.5 V to 5.5 V; compatible with standard 5 V automotive rail with ±10% tolerance |
| Noise Density | 1.2 mG/√Hz at 5 mV/G; supports resolution better than 10 mA in typical 20 mm air-gap core designs |
Pinout & Package
ACS70311LOKATX-005B5-C uses the 4-pin SIP OK package (1 mm case thickness, longer/thicker leads than KT), optimized for current-sensing modules requiring mechanical robustness and high vibration tolerance. Leadform TX denotes lead-formed configuration for through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Power input & programming voltage source | Accepts 4.5–5.5 V; survives ±18 V transients; supplies internal regulator and programming circuitry |
| 2: VOUT | Analog output & programming data line | Delivers ratiometric voltage proportional to magnetic flux; used for Manchester-coded programming |
| 3: PROG_EN | Low-voltage programming enable | Pulled low to enter programming mode; eliminates need for >VCC programming voltages |
| 4: GND | Reference ground & broken-wire detection node | Open-circuit detection triggers diagnostic output shift to VBRK_H/VBRK_L; critical for functional safety |
Key Features
| Feature | Design Value |
|---|---|
| Undervoltage Detection (UVD) | Enables early fault reporting before MCU reset; integrated hysteresis prevents chatter during supply sag |
| Low-Voltage Programming | Eliminates external high-voltage programming circuitry; reduces BOM cost and layout complexity |
| Broken-Ground Detection | Provides fail-safe indication of GND disconnection without external comparators or monitoring ICs |
| Customer-Programmable Clamps | Allows setting custom VCLP_H/VCLP_L thresholds to match downstream ADC full-scale range |
| Segmented Linear TC | Delivers ±1% sensitivity error and ±5 mV offset error across –40°C to 150°C without external compensation |
Applications
| Motor Control in EV Traction Inverters | High-Frequency DC-DC Converters |
|---|---|
Use Scenario: Real-time phase current feedback in 800 V SiC-based traction inverters operating at 50–100 kHz switching frequency. IC Role / Device Role / Timing Role: Bidirectional analog current sensor interfacing directly to isolated sigma-delta ADC; provides <2.1 µs latency for field-oriented control loops. Use Value: Enables stable torque control at high RPM by preserving signal integrity up to 240 kHz, reducing current ripple-induced torque oscillation. | Use Scenario: Input/output current monitoring in automotive 48 V–12 V bidirectional DC-DC converters using GaN FETs. IC Role / Device Role / Timing Role: Core-based shuntless current sensing with UVD-triggered fault signaling to power management controller. Use Value: Eliminates shunt resistor losses while maintaining <±1% gain accuracy across temperature, improving converter efficiency by 0.8–1.2%. |
| Onboard Charger (OBC) Current Sensing | Automotive Battery Management Systems |
Use Scenario: AC input and DC output current measurement in 11 kW OBCs with active front-end rectifiers. IC Role / Device Role / Timing Role: High-isolation, core-coupled current sensor providing galvanically isolated analog signals to MCU via optocouplers or capacitive isolators. Use Value: Supports IEC 61851-compliant leakage current detection and soft-start sequencing via programmable offset trim and UVD coordination. | Use Scenario: Cell-string current monitoring in 400 V battery packs with distributed BMS architecture. IC Role / Device Role / Timing Role: Ratiometric analog sensor with broken-ground detection feeding local microcontroller ADC inputs. Use Value: Detects harness disconnection or connector failure in real time, satisfying ASIL-B diagnostic coverage requirements without additional hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS70311LKTATX-005B5-C | Same die, KT package (shorter/thinner leads); 174°C/W thermal resistance vs. OK's 177°C/W | Better suited for PCB-mounted sensing where space is constrained; less robust in high-vibration module environments | Select KT for compact board-level integration; OK for bolt-in current-sensing modules requiring mechanical stability |
| ACS71250KMATR-005B5-C | Non-programmable, fixed 5 mV/G; no UVD, no low-voltage programming; 80 kHz bandwidth | Lacks diagnostic features and programmability; limited to non-safety-critical, cost-sensitive applications | Choose only if UVD, programmability, and 240 kHz bandwidth are not required; lower BOM cost but reduced design flexibility |
Compared with ACS70311LKTATX-005B5-C, the OK-package variant offers superior mechanical retention in module assemblies, while ACS71250KMATR-005B5-C sacrifices diagnostics and bandwidth for simplicity-making ACS70311LOKATX-005B5-C the optimal choice for ASIL-B compliant, high-dynamic-range automotive current sensing.
Availability
ACS70311LOKATX-005B5-C is available at Aetrix Electronics and suitable for automotive traction inverters, onboard chargers, and high-frequency DC-DC converters requiring stable component supply, long-term lifecycle support, and AEC-Q100 Grade 0 qualification.
Supply support for ACS70311LOKATX-005B5-C includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Allegro MicroSystems is a U.S.-based semiconductor company specializing in magnetic sensing, power ICs, and precision motion control solutions for automotive, industrial, and consumer markets.
The ACS70311 product line delivers programmable, high-bandwidth Hall-effect current sensors engineered for functional safety-critical automotive applications including electric vehicle powertrains and battery systems.
FAQ
What is the factory-programmed sensitivity of ACS70311LOKATX-005B5-C?
The ACS70311LOKATX-005B5-C has a factory-programmed sensitivity of 5 mV/G, with a programmable range of ±0.5 mV/G (2.5–5.5 mV/G). This value is set during final test and guaranteed across –40°C to 150°C with ±1% error, enabling precise current scaling without external calibration in core-based sensing configurations.
Does ACS70311LOKATX-005B5-C support undervoltage detection?
Yes, ACS70311LOKATX-005B5-C includes integrated undervoltage detection (UVD) with a nominal threshold of 4.2 V and 250 mV hysteresis. UVD asserts a diagnostic state on VOUT when VCC falls below VUVD_L, providing early warning before system brownout affects control loop stability.
What package type does ACS70311LOKATX-005B5-C use, and how does it differ from KT?
ACS70311LOKATX-005B5-C uses the OK-package 4-pin SIP with TX leadform (lead-formed). Compared to KT, OK features longer and thicker leads for enhanced mechanical retention in current-sensing modules, making it ideal for bolt-in applications subject to high vibration and thermal cycling.
Can ACS70311LOKATX-005B5-C be programmed after soldering to the PCB?
Yes, ACS70311LOKATX-005B5-C supports in-system programming via Manchester-coded signals on VOUT using PROG_EN. Low-voltage programming eliminates the need for >VCC voltages, allowing full offset and sensitivity trimming post-assembly without removing the device from the board.
What is the maximum operating bandwidth of ACS70311LOKATX-005B5-C?
The ACS70311LOKATX-005B5-C has a small-signal –3 dB bandwidth of 240 kHz, verified with CL = 1 nF and RL = 10 kΩ at TA = 25°C. This enables accurate capture of high-frequency current harmonics in SiC/GaN-based power converters without phase distortion.
ACS70311LOKATX-005B5-C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 4-SSIP Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Hall Effect
- Axis:
- -
- Output Type:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply (Max):
- 15mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 240kHz
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Supplier Device Package:
- 4-SIP
- Mounting Type:
- Through Hole
ACS70311LOKATX-005B5-C FAQ
1.How can I place an order for ACS70311LOKATX-005B5-C through Aetrix?
Please submit a Request for Quotation (RFQ) for ACS70311LOKATX-005B5-C on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ACS70311LOKATX-005B5-C reliable?
The price and inventory of ACS70311LOKATX-005B5-C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACS70311LOKATX-005B5-C is usually 5 days.
3.What payment methods are accepted for ACS70311LOKATX-005B5-C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACS70311LOKATX-005B5-C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACS70311LOKATX-005B5-C?
ACS70311LOKATX-005B5-C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACS70311LOKATX-005B5-C order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ACS70311LOKATX-005B5-C?
For technical support, including ACS70311LOKATX-005B5-C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACS70311LOKATX-005B5-C requirements.
6.How does Aetrix verify that ACS70311LOKATX-005B5-C is sourced from the original manufacturer or authorized distributors?
All ACS70311LOKATX-005B5-C products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ACS70311LOKATX-005B5-C meets industry standards.
7.What is the process for return or replacement of ACS70311LOKATX-005B5-C?
All ACS70311LOKATX-005B5-C units undergo pre-shipment inspection (PSI). If there is an issue with ACS70311LOKATX-005B5-C, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ACS70311LOKATX-005B5-C part is unused and in its original packaging.
Return procedure for ACS70311LOKATX-005B5-C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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