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Allegro MicroSystems ACS70311LOKATX-2P5B5-C
- Part No.:
- ACS70311LOKATX-2P5B5-C
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 4-SSIP Formed Leads
- Datasheet:
-
ACS70311LOKATX-2P5B5-C.pdf
- Description:
- HIGHEST ACCURACY PROGRAMMABLE LI
- Quantity:
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- Shipping:
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Product details
Overview
ACS70311LOKATX-2P5B5-C from Allegro MicroSystems is a programmable linear Hall-effect current sensor IC designed for core-based current sensing in automotive inverters and DC-DC converters. It delivers factory-trimmed 2.5 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 robust operation in harsh environments.
For engineers reviewing the ACS70311LOKATX-2P5B5-C datasheet, ACS70311LOKATX-2P5B5-C pinout, ACS70311LOKATX-2P5B5-C application, or ACS70311LOKATX-2P5B5-C equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, automotive-grade diagnostics, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The ACS70311LOKATX-2P5B5-C implements dynamic offset cancellation, segmented linear temperature compensation, and patented spiking suppression circuits to maintain accuracy under fast current transients. Its onboard supply regulator supports ±18 V survival on VCC and +16 V/–6 V on VOUT, enabling direct connection to 12 V automotive battery rails without external protection.
It features bidirectional analog output with ratiometric behavior (configurable), customer-programmable quiescent voltage (2.5 V nominal at 5 V VCC), and integrated diagnostics including broken-ground detection, output clamps, and UVD - all compliant with AEC-Q100 Grade 0 requirements for automotive powertrain and safety-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 2.5 mV/G factory-programmed; enables precise current measurement with ±1% error across –40°C to 150°C |
| Bandwidth | DC to 240 kHz; supports high-frequency switching in SiC/GaN inverters and fast transient response in DC-DC controllers |
| Response Time | 2.1 µs typical; ensures accurate capture of sub-microsecond current spikes in motor phase-leg monitoring |
| Operating Temp | –40°C to 150°C ambient; qualified for engine bay, traction inverter, and onboard charger applications |
| UVD Threshold | 4.2 V typical (hysteresis 250 mV); triggers diagnostic flag before system brownout affects control loop stability |
| Supply Voltage | 4.5–5.5 V; compatible with standard 5 V automotive microcontroller ADC reference rails |
| Output Noise | 3.7 mVRMS (typical); supports <100 mA resolution in 100 A range with 10-turn sense coil |
Pinout & Package
ACS70311LOKATX-2P5B5-C uses the OK 4-pin SIP 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 |
|---|---|---|
| VCC | Power input & programming rail | Accepts 4.5–5.5 V; survives ±18 V transients; supplies internal regulator and EEPROM programming circuitry |
| VOUT | Analog output & programming data line | Delivers ratiometric 0.5–4.5 V output; used with Manchester protocol for bidirectional trim communication |
| PROG_EN | Low-voltage programming enable | Pulled to GND for ESD protection; enables UVD and low-VCC programming without external >VCC voltages |
| GND | Signal and power ground | Open-circuit detection enabled; output shifts to 0–200 mV (low) or 4.8–5 V (high) during broken-wire fault |
Key Features
| Feature | Design Value |
|---|---|
| Undervoltage Detection (UVD) | Enables early warning of supply collapse before MCU reset; avoids false current readings during brownout |
| Low-Voltage Programming | Allows full sensitivity and offset trim using only VCC (no >VCC programming voltage required) |
| Broken-Ground Detection | Provides fail-safe output state (VBRK_L/VBRK_H) without external circuitry - critical for ASIL-B compliance |
| Reverse Battery Protection | Withstands –18 V on VCC; eliminates need for external TVS or diode in 12 V battery-connected designs |
| Customer-Programmable Clamps | Configurable output voltage limits enable short-circuit diagnostics and prevent ADC saturation in fault conditions |
Applications
| Electric Power Steering (EPS) | Onboard Charger (OBC) |
|---|---|
Use Scenario: Real-time motor phase current monitoring during torque assist and return-to-center control loops. IC Role / Device Role / Timing Role: Bidirectional analog current sensor with 2.1 µs response time, interfacing directly to MCU ADC with ratiometric scaling. Use Value: Enables closed-loop torque control within ±0.5 N·m accuracy despite 150°C under-hood temperatures and battery ripple. | Use Scenario: Primary-side AC input current sensing and secondary-side DC output current sensing in dual-stage OBC topologies. IC Role / Device Role / Timing Role: High-bandwidth (240 kHz) current monitor supporting interleaved PFC and LLC resonant converter feedback. Use Value: Maintains <±1% gain stability across –40°C to 150°C, eliminating thermal recalibration in compact, sealed OBC enclosures. |
| Traction Inverter | DC-DC Converter |
Use Scenario: Phase-leg current sensing for IGBT/SiC half-bridge modules in 400 V/800 V EV drivetrains. IC Role / Device Role / Timing Role: Core-based isolated current sensor with UVD and broken-ground diagnostics feeding safety controller (ASIL-C). Use Value: Survives ±18 V transients and detects open GND faults before inverter shoot-through - meeting ISO 26262 hardware fault tolerance requirements. | Use Scenario: Output current monitoring in high-efficiency 12 V/48 V bidirectional DC-DC converters for mild hybrid architectures. IC Role / Device Role / Timing Role: Low-noise (3.7 mVRMS), fast-response (2.1 µs) analog sensor interfaced to isolated sigma-delta ADC. Use Value: Supports <100 µs current-loop update rates while maintaining ±5 mV offset drift over lifetime - critical for adaptive voltage regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable Hall-effect current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS70311LKTATX-2P5B5-C | Same die, KT package (shorter/thinner leads); RθJA = 174°C/W vs. OK's 177°C/W; no TX leadform option in KT | Better suited for PCB-mounted current sensors where space is constrained; less robust in high-vibration module assemblies | Select KT when integrating into compact PCB layouts; OK preferred for bolt-in current modules with mechanical stress |
| ACS70310LOKATX-2P5B5-C | Lacks UVD and low-voltage programming; PROG_EN pin is NC/GND; no undervoltage diagnostic capability | Cannot support ASIL-B diagnostic coverage requirements; requires external voltage supervisor for brownout detection | Only consider for cost-sensitive non-safety applications where UVD is not mandated by system architecture |
Compared with ACS70311LKTATX-2P5B5-C, the ACS70311LOKATX-2P5B5-C offers superior mechanical reliability in module-level current sensing but slightly higher thermal resistance; versus ACS70310LOKATX-2P5B5-C, it adds essential automotive diagnostics - making it the only choice for new AEC-Q100 Grade 0 designs requiring UVD and fail-safe operation.
Availability
ACS70311LOKATX-2P5B5-C is available at Aetrix Electronics and suitable for electric power steering, traction inverter, and onboard charger applications requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing.
Supply support for ACS70311LOKATX-2P5B5-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 designer and manufacturer of high-performance magnetic sensing and power IC solutions, headquartered in Manchester, NH.
The ACS70311 product line delivers programmable, high-bandwidth Hall-effect current sensors engineered specifically for AEC-Q100 Grade 0 automotive power electronics - emphasizing diagnostic integrity, thermal stability, and system-level fault resilience.
FAQ
What is the factory-programmed sensitivity of ACS70311LOKATX-2P5B5-C?
The ACS70311LOKATX-2P5B5-C is factory-programmed to 2.5 mV/G sensitivity, corresponding to the "2P5" suffix. This value falls within the 1.2–2.5 mV/G programmable range enabled by SENS_COARSE = 1. The device maintains ±1% sensitivity error from –40°C to 150°C without user reprogramming.
Does ACS70311LOKATX-2P5B5-C support bidirectional current sensing?
Yes, ACS70311LOKATX-2P5B5-C is a bidirectional sensor with a nominal quiescent output voltage of 2.5 V at 5 V VCC. Its output swings above and below this midpoint in response to north/south magnetic polarity, enabling measurement of both charging and discharging currents in automotive energy storage systems.
What package type does ACS70311LOKATX-2P5B5-C use, and how does it differ from KT?
ACS70311LOKATX-2P5B5-C uses the OK 4-pin SIP package with TX leadform (lead-formed). Compared to KT, OK has longer and thicker leads optimized for current-sensing modules subject to mechanical vibration and thermal cycling - making it ideal for bolt-in sensor assemblies rather than PCB-only integration.
How does the undervoltage detection (UVD) function in ACS70311LOKATX-2P5B5-C?
ACS70311LOKATX-2P5B5-C monitors VCC and asserts UVD when voltage drops below 4.2 V (typical), with 250 mV hysteresis. This feature is exclusive to ACS70311 variants and provides early warning of supply degradation before system reset, enabling controlled shutdown or fault logging in automotive ECUs.
Can ACS70311LOKATX-2P5B5-C be programmed after soldering onto a PCB?
Yes, ACS70311LOKATX-2P5B5-C supports in-system programming via Manchester protocol on VOUT and PROG_EN pins using only the 5 V supply rail - no external programming voltage >VCC is required. This low-voltage programming capability simplifies calibration and trim during final test or field updates.
ACS70311LOKATX-2P5B5-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-2P5B5-C FAQ
1.How can I place an order for ACS70311LOKATX-2P5B5-C through Aetrix?
Please submit a Request for Quotation (RFQ) for ACS70311LOKATX-2P5B5-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-2P5B5-C reliable?
The price and inventory of ACS70311LOKATX-2P5B5-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-2P5B5-C is usually 5 days.
3.What payment methods are accepted for ACS70311LOKATX-2P5B5-C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACS70311LOKATX-2P5B5-C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACS70311LOKATX-2P5B5-C?
ACS70311LOKATX-2P5B5-C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACS70311LOKATX-2P5B5-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-2P5B5-C?
For technical support, including ACS70311LOKATX-2P5B5-C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACS70311LOKATX-2P5B5-C requirements.
6.How does Aetrix verify that ACS70311LOKATX-2P5B5-C is sourced from the original manufacturer or authorized distributors?
All ACS70311LOKATX-2P5B5-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-2P5B5-C meets industry standards.
7.What is the process for return or replacement of ACS70311LOKATX-2P5B5-C?
All ACS70311LOKATX-2P5B5-C units undergo pre-shipment inspection (PSI). If there is an issue with ACS70311LOKATX-2P5B5-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-2P5B5-C part is unused and in its original packaging.
Return procedure for ACS70311LOKATX-2P5B5-C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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