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Allegro MicroSystems A1366LKTTF-1-T
- Part No.:
- A1366LKTTF-1-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 4-SSIP
- Datasheet:
-
A1366LKTTF-1-T.pdf
- Description:
- LOW NOISE, HIGH-PRECISION LINEAR
- Quantity:
- Payment:
- Shipping:
Inventory:1,713
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Product details
Overview
The A1366LKTTF-1-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 1 mV/G sensitivity, ±0.25% linearity error, and 120 kHz bandwidth across –40°C to 150°C, with built-in broken-ground-wire detection and AEC-Q100 qualification - enabling precise closed-loop control in HEV inverters and electric power steering systems.
For engineers reviewing the A1366LKTTF-1-T datasheet, A1366LKTTF-1-T pinout, A1366LKTTF-1-T application, or A1366LKTTF-1-T equivalent, this page provides verified technical context, temperature-compensated performance data, package-specific layout guidance, and validated alternative options for automotive-grade current sensing designs requiring <±1% total error over temperature.
Technical Context
This IC implements a BiCMOS analog signal path with chopper-stabilized dynamic offset cancellation and digital-domain segmented linear interpolated temperature compensation stored in on-chip EEPROM. The architecture maintains full analog bandwidth while correcting sensitivity and quiescent output drift across –40°C to 150°C without sacrificing response time.
It integrates open-circuit ground detection, undervoltage lockout (4.0 V enable / 3.5 V disable), and ratiometric output scaling - all operating within a 4.5–5.5 V supply range and delivering sub-µs propagation delay (2.2 µs typical) and 3.7 µs response time under 400 G step excitation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 1 mV/G ±2.5% over temperature - enables accurate field-to-voltage conversion for low-current sensing with minimal gain calibration. |
| Bandwidth | 120 kHz (–3 dB) - supports real-time current monitoring in fast-switching HEV inverter gate drivers and DC-DC controllers. |
| Linearity Error | < ±0.25% - ensures monotonic output across bidirectional magnetic fields up to ±2 V from quiescent point. |
| Quiescent Output | 2.500 V ±10 mV (–40°C to 150°C) - ratiometric to VCC, enabling stable zero-field reference despite supply variation. |
| Operating Temp | –40°C to 150°C - qualified per AEC-Q100 Grade 0, suitable for under-hood EPS and inverter module placement. |
| Noise Density | 1.1 mGRMS/√Hz - achieves high-resolution current measurement without external filtering in noisy automotive environments. |
| Supply Range | 4.5 V to 5.5 V - compatible with standard 5 V automotive rails; includes UVLO with 4.0 V turn-on threshold. |
Pinout & Package
The A1366LKTTF-1-T is housed in a 4-pin single in-line package (SIP), suffix KT, with 1 mm case thickness, Pb-free construction, and 100% matte tin leadframe plating. The package is AEC-Q100 qualified and optimized for thermal dissipation (RθJA = 174 °C/W on 1-layer PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Power input; requires 0.1 µF bypass capacitor to GND for noise immunity and stable operation. |
| 2 | VOUT | Analog voltage output proportional to magnetic field; low-impedance (9 Ω), capable of driving ≥4.7 kΩ loads. |
| 3 | NC | No internal connection; must be tied to GND for optimal ESD protection per Allegro recommendation. |
| 4 | GND | Ground reference; open-circuit detection enabled - disconnect triggers VOUT to rail or near-GND depending on load configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed sensitivity | 1 mV/G calibrated at Allegro with resolution sufficient for <±1% total error over temperature. |
| Digital temperature compensation | Proprietary segmented linear interpolation applied in EEPROM - eliminates analog TC circuitry while preserving 120 kHz bandwidth. |
| Built-in broken ground detection | Monitors GND pin continuity; asserts fault-level output (VCC or ~100 mV) without external circuitry - critical for ASIL-B functional safety compliance. |
| High-speed dynamic offset cancellation | Chopper-stabilized architecture suppresses 1/f noise and thermal drift, enabling sub-mG resolution at full bandwidth. |
| AEC-Q100 Grade 0 qualification | Validated for operation up to 150°C junction temperature - supports placement in high-heat zones of traction inverters and EPS motor controllers. |
Applications
| Hybrid Electric Vehicle (HEV) Inverter | Electric Power Steering (EPS) |
|---|---|
Use Scenario: Real-time phase current monitoring in IGBT or SiC half-bridge modules for torque vectoring and overcurrent protection. IC Role / Device Role / Timing Role: Linear Hall-effect current sensor providing isolated, galvanically uncoupled analog feedback with 2.2 µs propagation delay and 120 kHz bandwidth. Use Value: Enables fast fault response (<5 µs system latency) and high-fidelity current reconstruction for predictive motor control algorithms. | Use Scenario: Motor current sensing in brushless DC assist motors to regulate torque assist level based on driver input and vehicle speed. IC Role / Device Role / Timing Role: Ratiometric analog current transducer interfacing directly to MCU ADC with no gain/offset calibration required across temperature. Use Value: Delivers <±0.25% linearity and <±1% total error over –40°C to 150°C - eliminating recalibration during cold starts and under-hood thermal cycling. |
| DC-DC Converter Monitoring | Onboard Charger (OBC) Current Loop |
Use Scenario: High-side current sensing in 400 V–800 V bidirectional DC-DC converters for battery management and energy routing. IC Role / Device Role / Timing Role: Isolated current sensor with integrated open-ground detection - monitors primary-side current without shunt resistor losses or optocoupler latency. Use Value: Supports >100 kHz switching frequencies with minimal phase lag; broken-wire detection prevents silent failure in safety-critical power paths. | Use Scenario: Input/output current sensing in AC-DC and DC-DC stages of EV onboard chargers to enforce grid harmonics limits and thermal derating. IC Role / Device Role / Timing Role: Factory-trimmed linear Hall sensor with 1 mV/G sensitivity and <3.7 µs response time - synchronizes with PWM control loops for adaptive current limiting. Use Value: Achieves ±1% accuracy over full automotive temperature range without external temperature sensors or software compensation. |
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 | Integrated current conductor; 10 A range; 100 kHz bandwidth; no factory-programmable sensitivity. | Requires PCB trace integration; lower bandwidth limits use in >50 kHz switching topologies. | Preferred when board space allows integrated conductor and cost-sensitive designs prioritize monolithic integration over programmability. |
| TLE4971-2K12M | 12-bit digital SPI output; 200 kHz bandwidth; ±0.5% total error; no EEPROM-based temperature compensation. | Requires MCU SPI interface and digital filtering; lacks analog ratiometric output for direct ADC interfacing. | Selected when system demands digital diagnostics, CRC error checking, and higher bandwidth - at expense of analog simplicity and passive fault signaling. |
Compared with ACS724LLCTR-10AU-T and TLE4971-2K12M, the A1366LKTTF-1-T uniquely combines factory-programmed analog sensitivity, EEPROM-based temperature compensation, and open-ground detection in a 4-pin SIP - making it optimal for analog-centric, safety-aware automotive current loops where layout simplicity and deterministic fault behavior are prioritized.
Availability
A1366LKTTF-1-T is available at Aetrix Electronics and suitable for hybrid electric vehicle inverter monitoring, electric power steering motor control, and high-voltage DC-DC converter current sensing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for A1366LKTTF-1-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, power ICs, and precision motion control solutions for automotive and industrial markets.
The A1366 product line was engineered specifically for high-accuracy, high-bandwidth current sensing in demanding automotive power electronics - emphasizing temperature stability, functional safety features, and analog signal integrity without digital overhead.
FAQ
What is the sensitivity tolerance of the A1366LKTTF-1-T over its full operating temperature range?
The A1366LKTTF-1-T has a sensitivity of 1 mV/G with a total drift of ±2.5% across –40°C to 150°C, achieved via proprietary segmented linear interpolated temperature compensation programmed at the Allegro factory. This includes contributions from ∆SensTC (±2.5%), ∆SensPKG (±1.25%), and ∆SensLIFE (±1%) - all specified in the A1366LKT-1-T performance table. The A1366LKTTF-1-T inherits these values as a member of the A1366LKT family.
Does the A1366LKTTF-1-T require external components for stable operation?
Yes - the A1366LKTTF-1-T requires a 0.1 µF ceramic bypass capacitor between VCC and GND, placed as close as possible to the device pins. An external load resistor (≥4.7 kΩ) must also be connected to VOUT for proper biasing. No external compensation or filtering is needed for basic operation due to its integrated dynamic offset cancellation and 120 kHz bandwidth design. The A1366LKTTF-1-T does not require additional temperature sensors or calibration circuitry.
How does the broken ground wire detection function in the A1366LKTTF-1-T?
The A1366LKTTF-1-T monitors continuity on the GND pin (Pin 4). If disconnected, VOUT transitions to either VCC (if pulled up) or ~100 mV (if pulled down), providing unambiguous fault signaling without external comparators. This feature is implemented using patented internal circuitry and is fully operational across –40°C to 150°C. The A1366LKTTF-1-T's broken-wire detection is independent of magnetic field presence and activates within microseconds of disconnection.
Is the A1366LKTTF-1-T pin-compatible with other variants in the A1366 family?
Yes - all A1366LKT-x-T variants (including A1366LKTTF-1-T, A1366LKTTF-2-T, etc.) share identical 4-pin SIP (KT) packaging, pinout, and electrical interface. Differences are limited to factory-programmed sensitivity (1 mV/G for A1366LKTTF-1-T), noise performance, and minor quiescent voltage tolerances. PCB layout and schematic symbols can be reused across the family, simplifying design scalability for varying current ranges.
What automotive qualification standards does the A1366LKTTF-1-T meet?
The A1366LKTTF-1-T is AEC-Q100 qualified to Grade 0 (–40°C to +150°C ambient), with full validation including HTOL, TC, UHAST, and ESD testing. It meets ISO 26262 readiness requirements for ASIL-B systems through its built-in diagnostic features - including undervoltage lockout, open-ground detection, and ratiometric output stability. The A1366LKTTF-1-T's qualification documentation is available directly from Allegro MicroSystems upon request.
A1366LKTTF-1-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
A1366LKTTF-1-T FAQ
1.How can I place an order for A1366LKTTF-1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1366LKTTF-1-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 A1366LKTTF-1-T reliable?
The price and inventory of A1366LKTTF-1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1366LKTTF-1-T is usually 5 days.
3.What payment methods are accepted for A1366LKTTF-1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1366LKTTF-1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1366LKTTF-1-T?
A1366LKTTF-1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1366LKTTF-1-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 A1366LKTTF-1-T?
For technical support, including A1366LKTTF-1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1366LKTTF-1-T requirements.
6.How does Aetrix verify that A1366LKTTF-1-T is sourced from the original manufacturer or authorized distributors?
All A1366LKTTF-1-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 A1366LKTTF-1-T meets industry standards.
7.What is the process for return or replacement of A1366LKTTF-1-T?
All A1366LKTTF-1-T units undergo pre-shipment inspection (PSI). If there is an issue with A1366LKTTF-1-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 A1366LKTTF-1-T part is unused and in its original packaging.
Return procedure for A1366LKTTF-1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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