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Allegro MicroSystems A1366LKTTG-10-T
- Part No.:
- A1366LKTTG-10-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 4-SSIP
- Datasheet:
-
A1366LKTTG-10-T.pdf
- Description:
- LOW NOISE, HIGH-PRECISION LINEAR
- Quantity:
- Payment:
- Shipping:
Inventory:1,650
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Product details
Overview
The A1366LKTTG-10-T from Allegro MicroSystems is a factory-programmed linear Hall-effect current sensor IC designed for high-accuracy, high-bandwidth analog current sensing in automotive power electronics. It delivers 10 mV/G sensitivity, ±1% typical accuracy over –40°C to 150°C, and 120 kHz bandwidth - enabling precise real-time monitoring in HEV inverters, DC-DC converters, and electric power steering (EPS) systems.
For engineers reviewing the A1366LKTTG-10-T datasheet, A1366LKTTG-10-T pinout, A1366LKTTG-10-T application, or A1366LKTTG-10-T equivalent, this page provides verified technical context, temperature-compensated performance data, automotive-grade reliability features (AEC-Q100, broken-wire detection), and validated alternative options for current-sensing design continuity.
Technical Context
The A1366LKTTG-10-T implements digital-domain segmented linear interpolated temperature compensation stored in on-chip EEPROM, maintaining flat sensitivity and quiescent output voltage 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 and 120 kHz small-signal –3 dB bandwidth.
It features ratiometric operation (sensitivity and VOUT(Q) proportional to VCC), undervoltage lockout (VUVLOH = 4 V, VUVLOL = 3.5 V), open-circuit ground detection, and proprietary suppression of output spiking during fast magnetic transients - all within a 1 mm-thick 4-pin SIP package qualified to AEC-Q100 Grade 0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 10 mV/G (factory-programmed; enables high-resolution current measurement with 100 G full-scale range) |
| Operating Temperature | –40°C to 150°C (supports under-hood automotive environments without external thermal management) |
| Bandwidth | 120 kHz (–3 dB; supports real-time control loop response in HEV inverter gate drivers) |
| Accuracy | ±1% typical over temperature (achieved via digital temperature compensation; eliminates calibration drift) |
| Quiescent Output Voltage | 2.500 V ±15 mV (ratiometric to VCC; stable reference for bidirectional current sensing) |
| Noise Density | 1.1 mGRMS/√Hz (enables sub-milliohm shunt resolution in high-current EPS motor phases) |
| Supply Voltage | 4.5–5.5 V (compatible with standard 5 V automotive rail; includes UVLO at 3.5–4.0 V) |
Pinout & Package
The A1366LKTTG-10-T is housed in a 4-pin single in-line package (SIP, suffix KT), 1 mm case thickness, Pb-free with 100% matte tin leadframe plating. The package is AEC-Q100 qualified and optimized for minimal mechanical stress sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | 5 V supply input; requires 0.1 µF bypass capacitor to GND for noise immunity and UVLO stability |
| 2 | VOUT | Analog voltage output (0.5–4.5 V); ratiometric to VCC, drives 4.7 kΩ pull-up/pull-down loads |
| 3 | NC | No internal connection; must be tied to GND for optimal ESD protection per Allegro recommendation |
| 4 | GND | Power and signal reference ground; open-circuit detection triggers fault voltage on VOUT |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed sensitivity | 10 mV/G calibrated at Allegro; eliminates system-level gain trimming and reduces BOM count |
| Digital temperature compensation | Segmented linear interpolation in EEPROM; achieves <±0.25% linearity error and flat TC across full –40°C to 150°C range |
| Broken ground wire detection | Monitors GND pin continuity; asserts VBRK(HIGH) ≈ VCC or VBRK(LOW) ≤ 100 mV to flag wiring faults in EPS safety-critical paths |
| 120 kHz analog bandwidth | Enabled by chopper stabilization and low-noise BiCMOS front-end; supports closed-loop control in 20 kHz PWM inverters with margin |
| AEC-Q100 Grade 0 qualification | Validated for 150°C junction operation; meets automotive reliability requirements for HEV traction and steering subsystems |
Applications
| Hybrid Electric Vehicle (HEV) Inverter | Electric Power Steering (EPS) |
|---|---|
Use Scenario: Real-time phase current monitoring in IGBT/SiC inverter legs for torque vectoring and overcurrent protection. IC Role / Device Role / Timing Role: Linear Hall-effect current sensor providing isolated, high-bandwidth analog feedback to MCU ADC. Use Value: 120 kHz bandwidth and ±1% accuracy enable precise current limiting at 10–20 kHz switching frequencies without phase lag. |
Use Scenario: Motor phase current sensing in brushless DC (BLDC) assist motors for torque estimation and fault detection. IC Role / Device Role / Timing Role: Ratiometric analog current sensor interfacing directly to 12-bit MCU ADC with 5 V supply. Use Value: Factory-programmed 10 mV/G sensitivity and broken-wire detection support ASIL-B functional safety requirements. |
| Automotive DC-DC Converter | Onboard Charger (OBC) Input Stage |
Use Scenario: High-side input current sensing in 48 V/12 V bi-directional DC-DC converters for energy management. IC Role / Device Role / Timing Role: Isolated current monitor with open-circuit GND detection for converter enable/disable sequencing. Use Value: Immunity to mechanical stress and –40°C to 150°C operation ensure reliability in engine bay mounting locations. |
Use Scenario: AC input current monitoring in OBC PFC stage for grid synchronization and harmonic mitigation. IC Role / Device Role / Timing Role: High-precision linear Hall sensor delivering low-noise analog output to DSP controller. Use Value: 1.1 mGRMS/√Hz noise density and <±0.25% linearity error enable accurate RMS current calculation at 50/60 Hz + harmonics. |
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-10AU-T | 10 mV/A sensitivity, 80 kHz bandwidth, integrated conductor; no EEPROM-based TC - relies on analog compensation | Limited to ≤80 A RMS; lower bandwidth restricts use in >15 kHz switching topologies | Prefer for cost-sensitive, non-AEC-Q100 designs where PCB space allows integrated conductor placement |
| TLE4971-10B5-U | 10 mV/mT sensitivity (≈100 mV/G), 200 kHz bandwidth, digital SPI output; factory-calibrated but not EEPROM-programmable | Requires MCU SPI interface; lacks analog ratiometric output and broken-wire detection | Prefer when digital diagnostics, higher bandwidth, or multi-sensor daisy-chaining are required |
Compared with ACS724LLCTR-10AU-T and TLE4971-10B5-U, the A1366LKTTG-10-T uniquely combines factory-programmed analog sensitivity, digital temperature compensation with EEPROM storage, 120 kHz analog bandwidth, and dedicated broken-wire detection - making it optimal for AEC-Q100-compliant HEV/EPS analog feedback loops requiring zero calibration drift.
Availability
A1366LKTTG-10-T is available at Aetrix Electronics and suitable for hybrid electric vehicle inverters, electric power steering systems, and automotive DC-DC converters requiring stable component supply through production lifecycle transitions.
Supply support for A1366LKTTG-10-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 magnetic sensing and power ICs for automotive, industrial, and consumer applications.
The A1366LKTTG-10-T belongs to Allegro's factory-programmed linear Hall-effect sensor product line, engineered specifically for high-accuracy, high-reliability current sensing in demanding automotive power electronics where temperature stability and functional safety are critical.
FAQ
What is the factory-programmed sensitivity of the A1366LKTTG-10-T?
The A1366LKTTG-10-T is factory-programmed to deliver a nominal sensitivity of 10 mV/G, measured using a 100 G magnetic field at TA = 25°C. This value is guaranteed within ±2.5% over the full operating temperature range (–40°C to 150°C), and the device maintains this accuracy via its proprietary digital temperature compensation algorithm stored in on-chip EEPROM. The A1366LKTTG-10-T does not require external gain adjustment.
Does the A1366LKTTG-10-T support AEC-Q100 qualification?
Yes, the A1366LKTTG-10-T is AEC-Q100 qualified to Grade 0 (maximum junction temperature of 165°C), confirming its suitability for under-hood automotive applications including HEV inverters and electric power steering. Its qualification includes stress testing for temperature cycling, humidity, and mechanical shock - and the device features built-in broken ground wire detection and undervoltage lockout to meet functional safety expectations.
What is the maximum analog bandwidth of the A1366LKTTG-10-T?
The A1366LKTTG-10-T has a nominal small-signal –3 dB bandwidth of 120 kHz, measured with CL = 1 nF and TA = 25°C. This bandwidth is achieved through proprietary packaging techniques and chopper stabilization, enabling real-time current monitoring in high-frequency switching applications such as 20 kHz PWM-controlled inverters. Bandwidth remains stable across temperature due to digital compensation.
How does the A1366LKTTG-10-T handle ground disconnection faults?
The A1366LKTTG-10-T incorporates dedicated broken ground wire detection: if the GND pin becomes disconnected, VOUT shifts to either VBRK(HIGH) ≈ VCC (when pulled up) or VBRK(LOW) ≤ 100 mV (when pulled down), providing a clear fault signature. This feature is implemented in hardware and operates independently of microcontroller intervention - a key requirement for ASIL-B–compliant EPS and inverter systems.
Is the A1366LKTTG-10-T still in active production?
The A1366LKTTG-10-T is classified as Last Time Buy (LTB) per Allegro's April 1, 2024 notice, with final purchase date July 31, 2024. While no longer recommended for new designs, Aetrix Electronics maintains inventory and supports legacy production programs with traceable, fully tested units. Customers are advised to consult Allegro's official LTB documentation and engage early for obsolescence mitigation planning.
A1366LKTTG-10-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 4-SSIP
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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-10-T FAQ
1.How can I place an order for A1366LKTTG-10-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1366LKTTG-10-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-10-T reliable?
The price and inventory of A1366LKTTG-10-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-10-T is usually 5 days.
3.What payment methods are accepted for A1366LKTTG-10-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1366LKTTG-10-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1366LKTTG-10-T?
A1366LKTTG-10-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1366LKTTG-10-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-10-T?
For technical support, including A1366LKTTG-10-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1366LKTTG-10-T requirements.
6.How does Aetrix verify that A1366LKTTG-10-T is sourced from the original manufacturer or authorized distributors?
All A1366LKTTG-10-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-10-T meets industry standards.
7.What is the process for return or replacement of A1366LKTTG-10-T?
All A1366LKTTG-10-T units undergo pre-shipment inspection (PSI). If there is an issue with A1366LKTTG-10-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-10-T part is unused and in its original packaging.
Return procedure for A1366LKTTG-10-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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