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Home > Products > Sensors, Transducers > Magnetic Sensors > Linear, Compass (ICs)

Allegro MicroSystems A1366LKTTF-2-T

Name: A1366LKTTF-2-T
Brand: Allegro MicroSystems
SKU: A1366LKTTF-2-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A1366LKTTF-2-T

Manufacturer:: Allegro MicroSystems

Category:: Linear, Compass (ICs)

Package:: 4-SSIP

Datasheet:: A1366LKTTF-2-T.pdf

Description:: LOW NOISE, HIGH-PRECISION LINEAR

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Product details

Overview

A1366LKTTF-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 analog bandwidth, and operates across –40°C to 150°C - enabling precise real-time monitoring in HEV inverter legs and electric power steering motor phases.

For engineers reviewing the A1366LKTTF-2-T datasheet, A1366LKTTF-2-T pinout, A1366LKTTF-2-T application, or A1366LKTTF-2-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 system design.

Technical Context

The A1366LKTTF-2-T integrates a proprietary BiCMOS interface with dynamic offset cancellation and chopper-stabilized amplification to achieve 1.1 mG_RMS/√Hz noise density and 3.7 µs response time. Its digital-domain segmented linear interpolation temperature compensation - programmed at Allegro's factory into on-chip EEPROM - maintains sensitivity drift within ±2.5% over –40°C to 150°C without degrading analog signal path bandwidth.

This architecture enables ratiometric operation (V_OUT(Q) = V_CC/2 ±10 mV) with built-in undervoltage lockout (V_UVLOL = 3.5 V), open-ground detection, and 78 µs power-on time - all while sustaining 120 kHz small-signal bandwidth and immunity to mechanical stress in thin 1 mm SIP packages.

Key Specifications

Parameter	Value and Actual Design Meaning
Sensitivity	2.5 mV/G (factory-programmed; enables direct scaling for ±400 G field range)
Operating Temperature	–40°C to 150°C (AEC-Q100 Grade 0 qualified; supports under-hood EPS and inverter placement)
Analog Bandwidth	120 kHz (–3 dB; supports fast transient current detection in 20 kHz PWM-driven motors)
Linearity Error	< ±0.25% (ensures ≤10 mV error over ±2 V output swing; critical for closed-loop torque control)
Quiescent Output	2.500 V ±10 mV at V_CC = 5 V (ratiometric; tracks supply variation to maintain measurement accuracy)
Power-On Time	78 µs (enables synchronization with MCU startup in safety-critical automotive boot sequences)
Noise Density	1.1 mG_RMS/√Hz (supports sub-ampere resolution in high-current shunt-less sensing)

Pinout & Package

Package: 4-pin Single In-line Package (SIP), 1 mm case thickness, Pb-free with 100% matte tin leadframe plating. Compatible with automated through-hole insertion and wave soldering.

Pin/Terminal	Circuit Role	Design Meaning
1 - V_CC	Positive supply input	Accepts 4.5–5.5 V; requires local 0.1 µF bypass capacitor to GND for noise immunity
2 - V_OUT	Analog voltage output	Provides ratiometric 0.5×V_CC quiescent level; drives ≥4.7 kΩ load with 230 V/ms slew rate
3 - NC	No-connect terminal	Must be connected to GND for optimal ESD robustness; not internally bonded
4 - GND	Ground reference	Return path for supply and output; open-circuit detection triggers V_BRK(HIGH) alert

Key Features

Feature	Design Value
Factory-programmed sensitivity & offset	Eliminates end-of-line calibration; achieves <±1% total error over temperature without trimming
Segmented linear interpolated TC	Maintains flat sensitivity vs. temperature (±2.5% drift) using on-die EEPROM lookup tables
Dynamic offset cancellation	Enables 120 kHz bandwidth while suppressing 1/f noise and thermal drift in Hall element
Broken ground wire detection	Asserts V_OUT = V_CC on GND pin disconnect - failsafe signaling for ASIL-B systems
Undervoltage lockout	Holds output in high-Z state below 3.5 V; prevents erroneous readings during brownout conditions

Applications

Hybrid Electric Vehicle (HEV) Inverter Phase Legs	Electric Power Steering (EPS) Motor Current Monitoring
Use Scenario: Real-time phase current measurement in 600 V IGBT-based traction inverters with 20 kHz PWM switching. IC Role / Device Role / Timing Role: Bidirectional analog current sensor providing isolated, low-latency feedback to gate driver control logic. Use Value: 120 kHz bandwidth captures fast current transients; ±0.25% linearity ensures accurate torque estimation and overcurrent protection.	Use Scenario: Closed-loop motor phase current sensing in 48 V EPS systems operating at ambient temperatures up to 150°C. IC Role / Device Role / Timing Role: Ratiometric Hall sensor interfacing directly to 16-bit ADC of EPS MCU without external gain/offset adjustment. Use Value: Factory-programmed 2.5 mV/G sensitivity and temperature-flat performance eliminate calibration overhead and reduce BOM cost.
DC-to-DC Converter Current Sensing	Automotive Battery Management Systems (BMS)
Use Scenario: High-side current monitoring in 48 V–12 V bidirectional buck-boost converters for vehicle electrification. IC Role / Device Role / Timing Role: Analog-output Hall sensor delivering fast, galvanically isolated current data to converter controller. Use Value: 78 µs power-on time synchronizes with converter enable sequence; broken-wire detection alerts on harness fault before startup.	Use Scenario: Cell-string current measurement in high-voltage battery packs where mechanical stress and thermal cycling degrade conventional sensors. IC Role / Device Role / Timing Role: Robust linear Hall sensor mounted directly on busbar, immune to vibration and thermal hysteresis. Use Value: ±1.25% sensitivity hysteresis after thermal cycling ensures long-term accuracy; AEC-Q100 qualification validates lifetime reliability.

Hybrid Electric Vehicle (HEV) Inverter Phase Legs

Electric Power Steering (EPS) Motor Current Monitoring

Use Scenario: Real-time phase current measurement in 600 V IGBT-based traction inverters with 20 kHz PWM switching.

IC Role / Device Role / Timing Role: Bidirectional analog current sensor providing isolated, low-latency feedback to gate driver control logic.

Use Value: 120 kHz bandwidth captures fast current transients; ±0.25% linearity ensures accurate torque estimation and overcurrent protection.

Use Scenario: Closed-loop motor phase current sensing in 48 V EPS systems operating at ambient temperatures up to 150°C.

IC Role / Device Role / Timing Role: Ratiometric Hall sensor interfacing directly to 16-bit ADC of EPS MCU without external gain/offset adjustment.

Use Value: Factory-programmed 2.5 mV/G sensitivity and temperature-flat performance eliminate calibration overhead and reduce BOM cost.

DC-to-DC Converter Current Sensing

Automotive Battery Management Systems (BMS)

Use Scenario: High-side current monitoring in 48 V–12 V bidirectional buck-boost converters for vehicle electrification.

IC Role / Device Role / Timing Role: Analog-output Hall sensor delivering fast, galvanically isolated current data to converter controller.

Use Value: 78 µs power-on time synchronizes with converter enable sequence; broken-wire detection alerts on harness fault before startup.

Use Scenario: Cell-string current measurement in high-voltage battery packs where mechanical stress and thermal cycling degrade conventional sensors.

IC Role / Device Role / Timing Role: Robust linear Hall sensor mounted directly on busbar, immune to vibration and thermal hysteresis.

Use Value: ±1.25% sensitivity hysteresis after thermal cycling ensures long-term accuracy; AEC-Q100 qualification validates lifetime reliability.

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	20 A integrated current sensor; 1.2 mV/mA sensitivity; internal conductor; no factory programming	Requires PCB layout change (integrated conductor vs. external magnetic path); lower bandwidth (80 kHz)	Choose when board space is constrained and external flux concentrators are impractical
TLE4971-2500S4HALA	2.5 mT range; 100 kHz bandwidth; programmable zero-point via SPI; no EEPROM-based TC	Needs microcontroller interface for calibration; higher system-level complexity for temperature compensation	Prefer when digital configurability and diagnostics outweigh need for plug-and-play analog accuracy

Compared with ACS724LLCTR-20AU-T and TLE4971-2500S4HALA, the A1366LKTTF-2-T delivers superior temperature stability (<±2.5% sensitivity drift) and higher analog bandwidth (120 kHz) without requiring external calibration or digital configuration - reducing firmware overhead and improving functional safety compliance in ASIL-B systems.

Availability

A1366LKTTF-2-T is available at Aetrix Electronics and suitable for hybrid electric vehicle inverters, electric power steering systems, and DC-to-DC converters requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for A1366LKTTF-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 motion control.

The A1366 product line was engineered specifically for high-accuracy, high-bandwidth current sensing in demanding automotive powertrain applications - emphasizing factory-trimmed precision, AEC-Q100 reliability, and seamless integration into safety-critical motor control systems.

FAQ

What is the sensitivity tolerance of the A1366LKTTF-2-T over its full operating temperature range?

The A1366LKTTF-2-T has a sensitivity tolerance of ±2.5% over –40°C to 150°C, achieved via factory-programmed segmented linear interpolation temperature compensation stored in on-chip EEPROM. This specification applies to the A1366LKTTF-2-T variant and is confirmed in the "A1366LKT-2-T PERFORMANCE CHARACTERISTICS" table on page 7 of the official datasheet (Rev. 7).

Does the A1366LKTTF-2-T require external calibration after assembly?

No, the A1366LKTTF-2-T does not require external calibration after assembly. Its sensitivity (2.5 mV/G) and quiescent output voltage (2.500 V) are factory-programmed with high resolution, and its temperature compensation is digitally implemented using on-die EEPROM - ensuring <±1% typical total error over temperature without user intervention. This capability is intrinsic to the A1366LKTTF-2-T design.

How does the broken ground wire detection function in the A1366LKTTF-2-T?

The A1366LKTTF-2-T monitors continuity on its GND pin (Pin 4). When disconnected, the output voltage shifts to V_BRK(HIGH) ≈ V_CC if a pull-up resistor is present, or to V_BRK(LOW) ≈ 100 mV if a pull-down resistor is used - providing unambiguous fault signaling. This feature is documented in the "OUTPUT CHARACTERISTICS" table (page 5) and applies specifically to the A1366LKTTF-2-T.

What is the maximum capacitive load the A1366LKTTF-2-T can drive on its VOUT pin?

The A1366LKTTF-2-T maintains stable operation with output capacitive loads up to 10 nF, as specified in the "OUTPUT CHARACTERISTICS" section (CL = – / 1 / 10 nF). This allows direct connection to standard ADC input filters without external buffering. The value is explicitly validated for the A1366LKTTF-2-T in the "COMMON OPERATING CHARACTERISTICS" table on page 5.

Is the A1366LKTTF-2-T pin-compatible with other variants in the A1366 family?

Yes, the A1366LKTTF-2-T shares the identical 4-pin SIP (KT) package and pinout with all A1366LKT-x-T variants (e.g., -1-T, -5-T, -10-T), including identical V_CC, V_OUT, NC, and GND assignments. Mechanical compatibility is confirmed in the "PINOUT DIAGRAM AND TERMINAL LIST TABLE" (page 3) and applies uniformly across the A1366LKTTF-2-T and related suffixes.

A1366LKTTF-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

A1366LKTTF-2-T FAQ

1.How can I place an order for A1366LKTTF-2-T through Aetrix?

Please submit a Request for Quotation (RFQ) for A1366LKTTF-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 A1366LKTTF-2-T reliable?

The price and inventory of A1366LKTTF-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 A1366LKTTF-2-T is usually 5 days.

3.What payment methods are accepted for A1366LKTTF-2-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1366LKTTF-2-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A1366LKTTF-2-T?

A1366LKTTF-2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A1366LKTTF-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 A1366LKTTF-2-T?

For technical support, including A1366LKTTF-2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1366LKTTF-2-T requirements.

6.How does Aetrix verify that A1366LKTTF-2-T is sourced from the original manufacturer or authorized distributors?

All A1366LKTTF-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 A1366LKTTF-2-T meets industry standards.

7.What is the process for return or replacement of A1366LKTTF-2-T?

All A1366LKTTF-2-T units undergo pre-shipment inspection (PSI). If there is an issue with A1366LKTTF-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 A1366LKTTF-2-T part is unused and in its original packaging.

Return procedure for A1366LKTTF-2-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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