My Inquiry
My Account
Allegro MicroSystems A1386LUA-T
- Part No.:
- A1386LUA-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 3-SSIP
- Datasheet:
-
A1386LUA-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,246
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
A1386LUA-T from Allegro MicroSystems is a discontinued 5 V field-programmable linear Hall effect sensor IC with 3 V supply functionality, analog output, and ultramini SIP package (1.5 mm × 4 mm × 3 mm). It delivers ratiometric quiescent voltage output (2.4–2.6 V at 5 V supply), programmable sensitivity (1.9–3.3 mV/G), factory-set 0.13%/°C temperature coefficient, ±1.5% linearity error, and operates across –40°C to 150°C for automotive throttle position sensing.
For engineers reviewing the A1386LUA-T datasheet, A1386LUA-T pinout, A1386LUA-T application, or A1386LUA-T equivalent, this page provides verified technical context, confirmed pin functions, real-world use cases in high-temperature motor control and safety-critical position feedback, and validated alternative options aligned with Allegro's official transition guidance.
Technical Context
The A1386LUA-T integrates a BiCMOS monolithic circuit with Hall element, dynamic offset cancellation (200 kHz chopper stabilization), temperature-compensated gain amplifier, and clamped low-impedance output stage. Its dual-mode operation-normal mode (4.5–5.5 V, 6.4 mA typical ICC) and low-power mode (2.8–3.2 V, ≤4 mA)-enables magnetic pole detection during system sleep or brown-out conditions.
Programming occurs via voltage pulses applied to the VOUT pin: VP(MID) = 14–16 V and VP(HIGH) = 26–28 V trigger Try/Blow/Lock modes. Five-bit quiescent voltage and six-bit sensitivity trimming allow end-of-line calibration without external DACs, while factory-programmed TCSENS targets Neodymium magnet compensation at 150°C relative to 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7–5.5 V: supports both 3 V brown-out detection and full 5 V accuracy operation |
| Quiescent Output Voltage | 2.4–2.6 V at VCC = 5 V: ratiometric, programmable to match ADC reference for direct interface |
| Sensitivity Range | 1.9–3.3 mV/G at VCC = 5 V: enables precise field-to-voltage scaling for position resolution |
| Temperature Range | –40°C to 150°C: qualified for under-hood automotive and industrial motor control environments |
| Output Clamping | VCLP(HIGH) = 4.39–4.58 V / VCLP(LOW) = 0.39–0.58 V at 5 V: provides short-circuit diagnostic capability |
| Internal Bandwidth | 20 kHz small-signal –3 dB: sufficient for RPM sensing up to ~120 kRPM with 1-pole magnet |
| Power-On Time | 30 µs at 5 V: ensures fast response after wake-up in battery-powered systems |
Pinout & Package
Package: 3-pin ultramini single-in-line (SIP), through-hole, 1.5 mm × 4 mm × 3 mm, Pb-free with 100% matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive supply input | Accepts 2.7–5.5 V; internal zener clamp at 6–8.3 V prevents overvoltage damage |
| 2 (GND) | Ground reference | Common return for supply and output; requires low-impedance PCB connection for noise immunity |
| 3 (VOUT) | Analog output signal | Programmable ratiometric voltage (0.39–4.58 V); carries programming pulses and diagnostic clamps |
Key Features
| Feature | Design Value |
|---|---|
| End-of-line programmability | 5-bit VOUT(Q) and 6-bit sensitivity trimming via VOUT pin pulses-no external programmer required |
| Ratiometric output stability | ±1.5% ratiometry error on VOUT(Q), Sens, and clamps ensures consistent scaling across supply variations |
| Dynamic offset cancellation | 200 kHz chopper stabilization with sample-and-hold yields <18 mVpp output noise and precise recoverability after thermal cycling |
| Dual-supply operation mode | Automatic switch between normal (≥4.1 V) and low-power (≤3.7 V) modes enables wake-on-field detection |
| High-temp reliability | Guaranteed performance from –40°C to 150°C with ∆VOUT(Q) ≤ ±35 mV and ∆SensTC ≤ ±3% over range |
Applications
| Throttle Position Sensing | Brake Pedal Position Feedback |
|---|---|
|
Use Scenario: Continuous angular measurement of accelerator pedal rotation in ICE and hybrid powertrains. IC Role / Device Role / Timing Role: Linear Hall sensor providing analog voltage proportional to magnet angle; interfaces directly to 10-bit automotive-grade ADC. Use Value: Factory-programmed 0.13%/°C TCSENS matches NdFeB magnet drift, enabling <±1.5% total error over –40°C to 150°C without software compensation. |
Use Scenario: Redundant pedal travel monitoring in brake-by-wire systems requiring functional safety compliance. IC Role / Device Role / Timing Role: Primary analog position transducer with output clamps for fault detection; paired with second A1386LUA-T for cross-checking. Use Value: VCLP(HIGH)/VCLP(LOW) clamps enable real-time short-circuit diagnostics, satisfying ASIL-B diagnostic coverage requirements. |
| Electric Power Steering Motor Commutation | Industrial Servo Motor Rotor Position |
|
Use Scenario: Low-latency rotor position feedback for 3-phase BLDC commutation in EPS ECU. IC Role / Device Role / Timing Role: High-bandwidth (20 kHz) analog sensor feeding closed-loop current controller; operates in normal mode during active steering. Use Value: 30 µs power-on time and 140 V/ms slew rate support rapid torque response during transient maneuvers. |
Use Scenario: Compact position sensing in IP67-rated servo drives where space and thermal resilience are critical. IC Role / Device Role / Timing Role: Through-hole SIP package withstands mechanical stress from vibration; operates continuously at 135°C ambient. Use Value: Resistance to mechanical stress and precise recoverability after thermal cycling ensure long-term zero-point stability in factory automation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Hall effect sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A1389LUA-T | Successor device with identical UA package, enhanced 2.5–5.5 V supply range, improved ±1.0% linearity, and integrated EEPROM for nonvolatile programming. | Supports full-life-cycle reprogramming in field; eliminates need for external pulse generator during calibration. | Select A1389LUA-T for new designs requiring field-upgradable sensitivity or extended supply flexibility below 2.7 V. |
| ACS724LLCTR-20AU-T | Current sensor IC (20 A range) with Hall-based analog output, SOIC-8 package, and 100 kHz bandwidth-not programmable, no VOUT pin programming. | Used for motor phase current monitoring rather than position sensing; lacks ratiometric quiescent voltage tuning. | Choose ACS724LLCTR-20AU-T only when measuring load current instead of magnetic field position; not a functional replacement. |
Compared with A1386LUA-T, A1389LUA-T offers backward-compatible pinout and superior long-term programmability, while ACS724LLCTR-20AU-T serves a fundamentally different measurement domain-current versus field position-making it unsuitable for direct substitution in throttle or pedal applications.
Availability
A1386LUA-T is available at Aetrix Electronics and suitable for legacy automotive repair, industrial equipment maintenance, and spare-part fulfillment requiring stable component supply for discontinued but mission-critical systems.
Supply support for A1386LUA-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, LLC is a U.S.-based designer and manufacturer of high-performance Hall-effect sensors and power ICs, headquartered in Worcester, Massachusetts.
The A1386 product line was developed specifically for high-accuracy, high-temperature linear position sensing in automotive powertrain and braking systems, emphasizing programmability, thermal stability, and robustness in harsh environments.
FAQ
Is A1386LUA-T still in production?
No, A1386LUA-T is a discontinued product. Allegro officially ended production as of December 1, 2015. It is no longer manufactured, and samples are unavailable. Aetrix Electronics supplies remaining authorized inventory for legacy system support and repair, but new design-ins are strongly discouraged. For new projects, Allegro recommends migrating to A1389LUA-T.
What is the correct pinout for A1386LUA-T?
The A1386LUA-T uses a 3-pin ultramini SIP package with pin 1 = VCC, pin 2 = GND, pin 3 = VOUT. This matches the UA suffix designation in Allegro's datasheet (A1386LUA-T, Rev. 5, page 3). Pin 1 accepts 2.7–5.5 V supply with internal zener clamp; pin 3 carries both analog output and programming pulses-no external components required for basic operation.
Can A1386LUA-T operate from a 3 V supply?
Yes, A1386LUA-T supports true 3 V operation in low-power mode (2.8–3.2 V), delivering reduced accuracy but retaining magnetic pole detection capability. In this mode, supply current drops to ≤4 mA, and sensitivity defaults to ~1.75 mV/G. For full-specification performance-including 1.9–3.3 mV/G sensitivity and ±1.5% linearity-5 V supply (4.5–5.5 V) in normal mode is required.
How is A1386LUA-T programmed?
A1386LUA-T is programmed by applying precise voltage pulses (VP(MID) = 14–16 V, VP(HIGH) = 26–28 V) to the VOUT pin. Each pulse sequence selects a register (quiescent voltage, sensitivity, lock bit) and writes values using fuse-blowing. Programming requires CBYPASS = 0.1 µF and CBLOW = 0.1 µF between VOUT and GND. Allegro recommends using their official Sensor IC Evaluation Kit for reliable calibration.
What is the maximum operating temperature for A1386LUA-T?
A1386LUA-T is fully specified and guaranteed from –40°C to +150°C ambient temperature. At 150°C, parameters including quiescent voltage drift (∆VOUT(Q) ≤ ±35 mV), sensitivity drift (∆SensTC ≤ ±3%), and output noise remain within datasheet limits. Thermal resistance for the UA package is 165°C/W on a 1-layer PCB, requiring appropriate copper area and airflow in high-temp deployments.
A1386LUA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 3-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):
- 8mA
- Current - Output (Max):
- 2mA
- Resolution:
- -
- Bandwidth:
- 20kHz
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- Programmable, Temperature Compensated
- Supplier Device Package:
- 3-SIP
- Mounting Type:
- Through Hole
A1386LUA-T FAQ
1.How can I place an order for A1386LUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1386LUA-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 A1386LUA-T reliable?
The price and inventory of A1386LUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1386LUA-T is usually 5 days.
3.What payment methods are accepted for A1386LUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1386LUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1386LUA-T?
A1386LUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1386LUA-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 A1386LUA-T?
For technical support, including A1386LUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1386LUA-T requirements.
6.How does Aetrix verify that A1386LUA-T is sourced from the original manufacturer or authorized distributors?
All A1386LUA-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 A1386LUA-T meets industry standards.
7.What is the process for return or replacement of A1386LUA-T?
All A1386LUA-T units undergo pre-shipment inspection (PSI). If there is an issue with A1386LUA-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 A1386LUA-T part is unused and in its original packaging.
Return procedure for A1386LUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A1386LUA-T Tags
-
DRV5053VAQDBZR
Texas Instruments
-
MMC5603NJ
Memsic Inc.
-
DRV5055A1QDBZR
Texas Instruments
-
MLX90392ELQ-AAA-011-RE
Melexis Technologies NV
-
CT100LW-HS6
Allegro MicroSystems
-
DRV5056A1ELPGMQ1
Texas Instruments
-
A1304ELHLX-T
Allegro MicroSystems
-
MMC5633NJL
Memsic Inc.
-
A1308KUA-2-T
Allegro MicroSystems
-
A1308KUA-1-T
Allegro MicroSystems
-
SI7210-B-04-IVR
Silicon Labs
-
A1308LLHLT-2-T
Allegro MicroSystems
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
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.
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.
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…
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…
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…
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 …
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…
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…
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…
