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Allegro MicroSystems A1366LKTTG-2-T
- Part No.:
- A1366LKTTG-2-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 4-SSIP
- Datasheet:
-
A1366LKTTG-2-T.pdf
- Description:
- LOW NOISE, HIGH-PRECISION LINEAR
- Quantity:
- Payment:
- Shipping:
Inventory:1,865
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Product details
Overview
A1366LKTTG-2-T from Allegro MicroSystems is a factory-programmed linear Hall-effect current sensor IC designed for high-accuracy bidirectional current sensing in automotive power electronics. It delivers 2.5 mV/G sensitivity, ±0.25% linearity error, 120 kHz bandwidth, and ratiometric analog output referenced to VCC. Its primary circuit role is isolated magnetic-field-to-voltage transduction in HEV inverter phase-leg monitoring.
For engineers reviewing the A1366LKTTG-2-T datasheet, A1366LKTTG-2-T pinout, A1366LKTTG-2-T application, or A1366LKTTG-2-T equivalent, key selection criteria include temperature-stable sensitivity drift (±2.5% over –40°C to 150°C), broken-ground-wire detection, AEC-Q100 qualification, and 1 mm-thin 4-pin SIP package compatibility with high-vibration motor control layouts.
Technical Context
The A1366LKTTG-2-T implements digital-domain segmented linear interpolated temperature compensation stored in on-chip EEPROM, enabling <±1% typical total accuracy across –40°C to 150°C without degrading analog signal path bandwidth. Its BiCMOS interface integrates a low-noise amplifier, dynamic offset cancellation, and chopper stabilization to achieve 1.1 mGRMS/√Hz noise density at 120 kHz.
Functional architecture includes dedicated open-circuit detection on GND, undervoltage lockout with 3.5 V/4 V thresholds, and proprietary output spiking suppression during fast current transients-critical for EPS and DC-DC converter feedback loops where EMI-induced false triggering must be avoided.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 2.437–2.563 mV/G at 25°C; enables precise current measurement with ±0.25% linearity error over ±2 V output swing |
| Bandwidth | 120 kHz (–3 dB); supports real-time closed-loop control in 20 kHz switching inverters with <3.7 µs response time |
| Operating Temp | –40°C to +150°C; qualified per AEC-Q100 Grade 0 for under-hood automotive placement |
| Supply Voltage | 4.5–5.5 V; ratiometric output ensures stable scaling across VCC variation without recalibration |
| Output Noise | 1.1 mGRMS/√Hz; achieves sub-milligauss resolution critical for low-current EPS torque sensing |
| Quiescent Output | 2.490–2.510 V at 25°C; tightly controlled 2.5 V mid-rail reference simplifies ADC interfacing |
| Package | 4-pin SIP (KT suffix), 1 mm case thickness; ultra-thin profile fits constrained PCB spaces near busbars |
Pinout & Package
4-pin single in-line package (SIP) with 1 mm case thickness, Pb-free construction, and 100% matte tin leadframe plating. Designed for surface-mount assembly with ejector pin mark on opposite side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | 5 V supply input; requires 0.1 µF bypass capacitor to GND for stable operation and noise immunity |
| 2 | VOUT | Analog voltage output proportional to magnetic field; 9 Ω low-impedance drive supports direct connection to 10 kΩ loads |
| 3 | NC | No internal connection; must be tied to GND for optimal ESD protection per Allegro recommendation |
| 4 | GND | Power ground reference; open-circuit detection triggers fault output if disconnected in automotive harnesses |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed sensitivity | 2.5 mV/G calibrated at Allegro; eliminates post-assembly trimming and reduces BOM count in production |
| Digital temperature compensation | EEPROM-based interpolation provides <±1% total error over full –40°C to 150°C range without analog compensation circuitry |
| Broken ground wire detection | Monitors GND continuity; asserts fault-level output to alert system controller of harness failure in EPS or inverter modules |
| 120 kHz bandwidth with chopper stabilization | Maintains high-frequency fidelity while suppressing 1/f noise-enables accurate current reconstruction in SiC-based 100 kHz+ converters |
| Undervoltage lockout | 3.5 V disable / 4 V enable thresholds prevent erratic output during cold-cranking or battery sag conditions |
Applications
| HEV Inverter Phase Current Sensing | Electric Power Steering (EPS) Motor Control |
|---|---|
Use Scenario: Real-time measurement of high-side and low-side leg currents in 3-phase traction inverters using external flux concentrators. IC Role / Device Role / Timing Role: Analog current transducer providing isolated, bandwidth-limited feedback to gate driver ICs and MCU ADCs. Use Value: 120 kHz bandwidth captures switching harmonics for active harmonic cancellation; ±0.25% linearity ensures torque accuracy within ±0.5 N·m at full load. | Use Scenario: Bidirectional current monitoring of brushless DC motor windings in column-assist EPS systems. IC Role / Device Role / Timing Role: Ratiometric Hall sensor delivering temperature-stable analog output to 12-bit safety MCU for torque estimation. Use Value: Factory-programmed 2.5 mV/G sensitivity and <±2 mV quiescent drift over lifetime eliminate calibration steps in Tier-1 production lines. |
| DC-DC Converter Current Monitoring | Onboard Charger (OBC) Isolation Feedback |
Use Scenario: High-side current sensing in 3.3 kW bi-directional OBC PFC stages operating at 70–100 kHz switching frequency. IC Role / Device Role / Timing Role: Primary-side current transducer feeding analog loop compensator and digital peak-current limit comparator. Use Value: 3.7 µs response time enables cycle-by-cycle current limiting; broken-wire detection prevents uncontrolled charging during connector disconnection. | Use Scenario: Secondary-side current feedback in isolated LLC resonant converters for battery charging regulation. IC Role / Device Role / Timing Role: Galvanically isolated analog sensor replacing optocoupler-based solutions in compact OBC designs. Use Value: 1 mm thin SIP package allows placement directly on secondary PCB layer adjacent to current sense shunt, minimizing parasitic inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Hall-effect current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS724LLCTR-20AU-T | Integrated current conductor; 20 A range; 1.2 mV/A sensitivity; no factory programming; ±1.5% total error over temp | Requires PCB layout with integrated conductor; less flexible for custom magnetic coupling geometries | Choose ACS724LLCTR-20AU-T when conductor integration simplifies assembly and ±1.5% accuracy suffices |
| TLE4971-2500S4HALA | Programmable sensitivity via SPI; 2.5 mV/G nominal; 100 kHz bandwidth; requires external EEPROM for calibration data storage | Needs microcontroller interface and firmware support; higher system-level complexity than factory-programmed A1366LKTTG-2-T | Choose TLE4971-2500S4HALA only when programmability justifies added design effort and cost |
Compared with ACS724LLCTR-20AU-T and TLE4971-2500S4HALA, the A1366LKTTG-2-T delivers superior temperature stability (<±1% vs. ±1.5%), higher bandwidth (120 kHz vs. 100 kHz), and zero-configurability-making it optimal for high-reliability automotive current sensing where calibration overhead and thermal drift must be minimized.
Availability
A1366LKTTG-2-T is available at Aetrix Electronics and suitable for HEV inverter monitoring, electric power steering (EPS) motor control, and DC-DC converter current feedback requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.
Supply support for A1366LKTTG-2-T 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 high-performance magnetic sensing and power ICs for automotive and industrial markets.
The A1366 product line was engineered specifically for high-bandwidth, high-accuracy current sensing in electrified vehicle powertrains-including hybrid inverters, EPS, and onboard chargers-where AEC-Q100 reliability and factory-calibrated temperature stability are mandatory.
FAQ
What is the sensitivity tolerance of the A1366LKTTG-2-T at 25°C?
The A1366LKTTG-2-T has a sensitivity of 2.437–2.563 mV/G at 25°C, corresponding to ±2.5% tolerance around the nominal 2.5 mV/G value. This specification is guaranteed across production lots and verified during Allegro's factory programming process. The A1366LKTTG-2-T maintains this tight tolerance due to its proprietary linear interpolation algorithm and EEPROM-based calibration storage.
Does the A1366LKTTG-2-T require external calibration after soldering?
No, the A1366LKTTG-2-T does not require external calibration after soldering. Its sensitivity and quiescent output voltage are factory-programmed with high resolution, and temperature compensation is digitally implemented using on-chip EEPROM. The A1366LKTTG-2-T achieves <±1% typical accuracy over –40°C to 150°C without user intervention or post-assembly trimming.
How does the broken ground wire detection function in the A1366LKTTG-2-T?
The A1366LKTTG-2-T monitors continuity on its GND pin (Pin 4) and asserts a fault-level output voltage-VBRK(HIGH) ≈ VCC or VBRK(LOW) ≈ 100 mV-when an open circuit is detected. This feature is implemented in hardware and operates independently of MCU control. In automotive applications, this enables immediate system-level fault reporting during harness disconnection events, enhancing functional safety compliance for A1366LKTTG-2-T deployments.
What is the maximum capacitive load the A1366LKTTG-2-T can drive on VOUT?
The A1366LKTTG-2-T maintains output stability with capacitive loads up to 10 nF on VOUT, as specified in the datasheet. For optimal transient response and noise immunity, Allegro recommends using CL = 1 nF with a 0.1 µF VCC bypass capacitor. Driving >10 nF may degrade rise time and introduce peaking; the A1366LKTTG-2-T's 9 Ω output impedance and 230 V/ms slew rate are optimized for this defined load range.
Is the A1366LKTTG-2-T pin-compatible with other variants in the A1366 family?
Yes, the A1366LKTTG-2-T shares identical 4-pin SIP (KT) packaging and pinout with all A1366LKT-x-T variants-including A1366LKTTN-1-T, A1366LKTTN-5-T, and A1366LKTTN-10-T. Pin 1 is VCC, Pin 2 is VOUT, Pin 3 is NC (tied to GND), and Pin 4 is GND. This uniformity allows board-level reuse across sensitivity grades, provided the application's magnetic field range aligns with the selected variant's 2.5 mV/G scaling.
A1366LKTTG-2-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 4-SSIP
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply (Max):
- 15mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 120kHz
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Features:
- Temperature Compensated
- Supplier Device Package:
- 4-SIP
- Mounting Type:
- Through Hole
A1366LKTTG-2-T FAQ
1.How can I place an order for A1366LKTTG-2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1366LKTTG-2-T 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 A1366LKTTG-2-T reliable?
The price and inventory of A1366LKTTG-2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1366LKTTG-2-T is usually 5 days.
3.What payment methods are accepted for A1366LKTTG-2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1366LKTTG-2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1366LKTTG-2-T?
A1366LKTTG-2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1366LKTTG-2-T 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 A1366LKTTG-2-T?
For technical support, including A1366LKTTG-2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1366LKTTG-2-T requirements.
6.How does Aetrix verify that A1366LKTTG-2-T is sourced from the original manufacturer or authorized distributors?
All A1366LKTTG-2-T 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 A1366LKTTG-2-T meets industry standards.
7.What is the process for return or replacement of A1366LKTTG-2-T?
All A1366LKTTG-2-T units undergo pre-shipment inspection (PSI). If there is an issue with A1366LKTTG-2-T, 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 A1366LKTTG-2-T part is unused and in its original packaging.
Return procedure for A1366LKTTG-2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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