Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Sensors, Transducers > Position Sensors > Angle, Linear Position Measuring

Allegro MicroSystems A1339LLETR-T

Name: A1339LLETR-T
Brand: Allegro MicroSystems
SKU: A1339LLETR-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: A1339LLETR-T

Manufacturer:: Allegro MicroSystems

Category:: Angle, Linear Position Measuring

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: A1339LLETR-T.pdf

Description:: SENSOR ANGLE 360DEG SMD

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,992

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

A1339LLETR-T from Allegro MicroSystems is a single-die, 360° contactless Hall-effect angle sensor IC with circular vertical Hall (CVH) technology, delivering 12-/15-bit angular position data, <1.0 µs angle refresh rate, and ASIL-B compliance for automotive safety-critical systems. It supports ABI/UVW encoder or motor commutation outputs, SPI (up to 10 MHz), and PWM angle reporting - deployed in electronic power steering (EPS) and rotary PRNDL systems.

For engineers reviewing the A1339LLETR-T datasheet, A1339LLETR-T pinout, A1339LLETR-T application, or A1339LLETR-T equivalent, this page delivers verified technical context, real-world interface timing, diagnostic coverage details, low-power mode behavior, and validated alternative options for functional replacement in ASIL-B–compliant designs.

Technical Context

The A1339LLETR-T implements dual digital signal paths: a high-speed PLL-based main path for sub-7 µs latency angle measurement and a ZCD-based secondary path for turns counting, field monitoring, and diagnostics. Its CVH front end enables robust operation across air gaps up to 4 mm with ±0.4° typical angle error at 300 G and 25°C.

It integrates on-chip EEPROM (100 write cycles), 4-bit SPI CRC, ECC for single-bit correction/dual-bit detection, and programmable wake-up thresholds (300–650 mV). The device operates from 4 V to 16.5 V, withstands ISO 7637-2 Pulse 5b up to 39 V, and functions from –40°C to 150°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Angle Resolution	12-bit or 15-bit via SPI register selection - enables trade-off between latency and precision in real-time control loops.
Angle Refresh Rate	1.0 µs typical - supports closed-loop motor control at >10 kHz update rates without interpolation.
Supply Voltage Range	4.0 V to 16.5 V - allows direct connection to 12 V battery with built-in reverse-battery protection (≤5 mA at –18 V).
SPI Clock Frequency	Up to 10 MHz - enables full 21-bit packet reads in ≤2.1 µs, minimizing host MCU overhead.
Operating Temperature	–40°C to +150°C - qualified per AEC-Q100 Grade 0, enabling under-hood deployment in EPS and throttle modules.
Low-Power Mode Current	98 µA average (sleep + wake) - sustains position tracking during vehicle ignition-off with minimal battery drain.
Diagnostic Coverage	Logic BIST, signal-path diagnostics, watchdog timers, and CRC-protected SPI - supports ASIL-B SEooC integration per ISO 26262.

Pinout & Package

Package: 14-pin TSSOP (suffix LE), lead-free with 100% matte tin plating, thermal resistance R_θJA = 82°C/W.

Pin/Terminal	Circuit Role	Design Meaning
BYP	External bypass capacitor terminal	Stabilizes internal regulator output; requires 0.1 µF ceramic capacitor to ground for noise immunity and startup stability.
VCC	Main power supply input	Accepts 4–16.5 V; powers all internal circuits including CVH front end, ADC, and digital logic - also serves as Manchester interface input line.
WAKE	External wake-up signal input	Programmable threshold (300–650 mV); triggers exit from low-power mode without requiring VCC cycling.
PWM	PWM angle output / Manchester output	Delivers duty-cycle-modulated angle (5–95% range); configurable carrier frequency (98 Hz to 3.125 kHz) for EMI optimization.
GND (pins 5, 6, 7)	Device ground terminals	Three dedicated ground pins reduce impedance and improve noise rejection in high-current automotive environments.
CS/SA0	SPI chip-select / Manchester ID LSB	Active-low SPI enable; in Manchester mode, sets die ID bit 0 - tied to BYP for '1', GND for '0'.
SCLK	SPI clock input	Accepts up to 10 MHz clock; 40–60% duty cycle required for reliable sampling of MOSI/MISO edges.
MOSI/SA1	SPI data-in / Manchester ID MSB	Receives SPI commands or sets die ID bit 1 in Manchester mode - tied to BYP for '1', GND for '0'.
MISO	SPI data-out	Tri-state output with 3.3 V logic levels; CL ≤ 20 pF load ensures t_DAV ≤ 30 ns for timing-critical applications.
A/U	Quadrature A or U-phase output	Selectable via EEPROM; provides incremental position (PPR up to 2048) or BLDC commutation signal (1–16 pole pairs).
B/V	Quadrature B or V-phase output	Complements A/U; quadrature phase shift enables direction detection; UVW outputs support 3-phase motor control.
I/W	Quadrature index or W-phase output	Index pulse (ABI mode) or third commutation phase (UVW mode); programmable hysteresis (0–1.38°) reduces false triggering.

Key Features

Feature	Design Value
ASIL-B SEooC compliance	Developed per ISO 26262 Part 5 for hardware safety; includes LBIST, CVH self-test, and fault-tolerant signal paths - eliminates need for external safety monitors in Tier 1 EPS designs.
Dual-signal-path architecture	PLL path delivers <7 µs latency for real-time control; ZCD path runs concurrently for turns counting and diagnostics - no performance penalty for safety features.
EEPROM programmability	100-cycle endurance stores calibration offsets, AB resolution (1–2048 PPR), UVW pole pairs (1–16), and wake thresholds - enables one-device-fits-all manufacturing with post-assembly tuning.
Harsh-environment resilience	Withstands 39 V ISO 7637-2 Pulse 5b transients, –40°C to 150°C operation, and 1200 G magnetic fields - certified for direct battery connection in automotive chassis modules.
Flexible interface modes	Supports SPI (10 MHz), PWM, ABI, UVW, and Manchester - allows system-level pin count reduction: e.g., EEPROM programming over VCC/PWM pins when only 3 pins are available.

Applications

Electronic Power Steering (EPS)	Rotary PRNDL Selector
Use Scenario: Real-time measurement of steering column rotation angle for assist torque calculation and lane-keeping feedback. IC Role / Device Role / Timing Role: Primary angle sensor providing 12-bit position data at 1 MHz refresh rate with <7 µs latency to MCU via SPI or ABI interface. Use Value: Enables precise torque overlay and active damping; ASIL-B diagnostics ensure fail-safe reporting during loss-of-signal events.	Use Scenario: Detection of gear selector knob position in automatic transmission control units. IC Role / Device Role / Timing Role: Contactless 360° position encoder delivering quadrature ABI signals with programmable resolution (up to 2048 PPR) for mechanical detent alignment. Use Value: Eliminates wear-prone potentiometers; hysteresis tuning (0–1.38°) prevents false state transitions during vibration.
Throttle Valve Control	Electric Brake Booster
Use Scenario: Monitoring accelerator pedal angle for engine management and drive-by-wire response. IC Role / Device Role / Timing Role: Safety-redundant angle sensor operating in ASIL-B context; provides PWM output for analog backup path and SPI for primary digital path. Use Value: Dual-path output ensures continuity during SPI bus faults; low-power mode maintains position memory during key-off.	Use Scenario: Measuring master cylinder pushrod displacement in electro-hydraulic brake systems. IC Role / Device Role / Timing Role: High-accuracy angle-to-linear conversion sensor with <±0.4° error at 300 G and 25°C, interfaced via UVW for BLDC actuator commutation. Use Value: Supports fast-response braking with <1 µs angle update; temperature drift ≤±1.4° over –40°C to 150°C ensures consistent pedal feel.

Electronic Power Steering (EPS)

Rotary PRNDL Selector

Use Scenario: Real-time measurement of steering column rotation angle for assist torque calculation and lane-keeping feedback.

IC Role / Device Role / Timing Role: Primary angle sensor providing 12-bit position data at 1 MHz refresh rate with <7 µs latency to MCU via SPI or ABI interface.

Use Value: Enables precise torque overlay and active damping; ASIL-B diagnostics ensure fail-safe reporting during loss-of-signal events.

Use Scenario: Detection of gear selector knob position in automatic transmission control units.

IC Role / Device Role / Timing Role: Contactless 360° position encoder delivering quadrature ABI signals with programmable resolution (up to 2048 PPR) for mechanical detent alignment.

Use Value: Eliminates wear-prone potentiometers; hysteresis tuning (0–1.38°) prevents false state transitions during vibration.

Throttle Valve Control

Electric Brake Booster

Use Scenario: Monitoring accelerator pedal angle for engine management and drive-by-wire response.

IC Role / Device Role / Timing Role: Safety-redundant angle sensor operating in ASIL-B context; provides PWM output for analog backup path and SPI for primary digital path.

Use Value: Dual-path output ensures continuity during SPI bus faults; low-power mode maintains position memory during key-off.

Use Scenario: Measuring master cylinder pushrod displacement in electro-hydraulic brake systems.

IC Role / Device Role / Timing Role: High-accuracy angle-to-linear conversion sensor with <±0.4° error at 300 G and 25°C, interfaced via UVW for BLDC actuator commutation.

Use Value: Supports fast-response braking with <1 µs angle update; temperature drift ≤±1.4° over –40°C to 150°C ensures consistent pedal feel.

Equivalent & Alternatives

The following parts are listed as comparable options for similar angle sensing applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AMS AS5055A	14-bit resolution, 2.5 µs latency, SPI-only interface, no PWM or UVW outputs; requires external EEPROM for calibration.	Lacks integrated diagnostics, ASIL certification, and motor commutation outputs - suitable for non-safety-critical industrial encoders but not EPS.	Select only for cost-sensitive, non-automotive applications where ASIL-B compliance and multi-output flexibility are unnecessary.
Texas Instruments TMAG5170	3-axis magnetic sensor with 16-bit angle output, 20 kSPS sampling, I²C/SPI interface; no integrated EEPROM or ASIL qualification.	Requires external microcontroller for angle computation and diagnostics; lacks turn-counting, low-power wake capability, and automotive qualification.	Prefer for space-constrained PCBs needing 3D field analysis; avoid where functional safety, embedded processing, or battery-backed position retention are required.

Compared with AMS AS5055A and TI TMAG5170, the A1339LLETR-T uniquely combines ASIL-B SEooC compliance, dual-signal-path latency optimization, on-chip EEPROM calibration storage, and native UVW/ABI/PWM output flexibility - making it the only drop-in solution for production EPS and PRNDL modules requiring zero additional safety hardware.

Availability

A1339LLETR-T is available at Aetrix Electronics and suitable for electronic power steering (EPS), rotary PRNDL selectors, throttle valve control, electric brake boosters, and other automotive subsystems requiring stable component supply across extended temperature and voltage ranges.

Supply support for A1339LLETR-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 global leader in motion control and energy-efficient power solutions, specializing in high-reliability Hall-effect sensors and motor driver ICs for automotive and industrial markets.

The A1339 product line was engineered specifically for ASIL-B and ASIL-D safety-critical angle sensing in electric powertrain and chassis systems - emphasizing diagnostic coverage, magnetic robustness, and seamless integration into ISO 26262-compliant architectures.

FAQ

What is the maximum rotational speed the A1339LLETR-T can accurately measure?

The A1339LLETR-T has been verified to track magnet position up to 12,000 rpm in testing and supports up to 30,000 rpm via design simulation. Its 1.0 µs angle refresh rate and <7 µs response time ensure accurate high-speed measurement without aliasing or latency-induced control errors in applications like EPS and BLDC motor commutation.

Does the A1339LLETR-T support both 3.3 V and 5 V SPI interfaces?

Yes, the A1339LLETR-T supports both 3.3 V and 5 V SPI interfaces. When VCC ≥ 5 V and 5 V interface mode is enabled via EEPROM, digital I/O levels meet VIH ≥ 3.75 V and VOH ≥ 4 V specifications. For 3.3 V operation, VIH ≥ 2.8 V and VOH ≥ 2.93 V are guaranteed - allowing flexible host MCU compatibility without level-shifting.

How does the A1339LLETR-T achieve ASIL-B compliance without external safety components?

The A1339LLETR-T achieves ASIL-B compliance through integrated hardware-level safety mechanisms: logic BIST (LBIST), circular vertical Hall (CVH) self-test, signal-path diagnostics, watchdog timers, and 4-bit CRC on all SPI transactions. These are implemented within the single-die SoC architecture and documented in the A1339 Safety Manual - eliminating need for external monitors in properly integrated systems.

Can the A1339LLETR-T retain angle position during vehicle ignition-off?

Yes, the A1339LLETR-T supports low-power mode with 98 µA average current consumption and retains angular position using its internal turns counter. In sleep state, it draws only 82 µA and wakes on WAKE pin assertion or magnetic field change - enabling continuous position tracking across key-off/key-on cycles in EPS and throttle applications.

What magnetic field strength is recommended for optimal A1339LLETR-T performance?

The A1339LLETR-T is optimized for magnetic field strengths ≥300 G, with typical angle error of ±0.4° and 3-sigma noise of ±0.19° at 300 G and 25°C. Performance degrades below 300 G; the datasheet explicitly recommends operation at 300 G and above for automotive applications such as EPS and PRNDL, where accuracy and repeatability are critical.

A1339LLETR-T Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: -

For Measuring:: Angle

Technology:: Hall Effect

Rotation Angle - Electrical, Mechanical:: 0° ~ 360°, Continuous

Linear Range:: -

Output:: PWM, SPI

Output Signal:: Programmable

Actuator Type:: External Magnet, Not Included

Linearity:: -

Resistance:: -

Resistance Tolerance:: -

Voltage - Supply:: 4V ~ 16.5V

Mounting Type:: Surface Mount

Termination Style:: Gull Wing

Operating Temperature:: -40°C ~ 150°C

Grade:: -

Qualification:: -

Supplier Device Package:: 14-TSSOP

A1339LLETR-T FAQ

1.How can I place an order for A1339LLETR-T through Aetrix?

Please submit a Request for Quotation (RFQ) for A1339LLETR-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 A1339LLETR-T reliable?

The price and inventory of A1339LLETR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1339LLETR-T is usually 5 days.

3.What payment methods are accepted for A1339LLETR-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1339LLETR-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A1339LLETR-T?

A1339LLETR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A1339LLETR-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 A1339LLETR-T?

For technical support, including A1339LLETR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1339LLETR-T requirements.

6.How does Aetrix verify that A1339LLETR-T is sourced from the original manufacturer or authorized distributors?

All A1339LLETR-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 A1339LLETR-T meets industry standards.

7.What is the process for return or replacement of A1339LLETR-T?

All A1339LLETR-T units undergo pre-shipment inspection (PSI). If there is an issue with A1339LLETR-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 A1339LLETR-T part is unused and in its original packaging.

Return procedure for A1339LLETR-T:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…