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 > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Analog Devices Inc./Maxim Integrated TMC249A-LA-T

Name: TMC249A-LA-T
Brand: Analog Devices Inc./Maxim Integrated
SKU: TMC249A-LA-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: TMC249A-LA-T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Motor Drivers, Controllers

Package:: 32-VQFN Exposed Pad

Datasheet:: TMC249A-LA-T.pdf

Description:: STEPPER MOTOR PREDRIVER IC, SPI,

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,519

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

Product details

Overview

TMC249A-LA-T from TRINAMIC Motion Control GmbH & Co. KG is a dual full-bridge stepper motor driver IC designed to control external high-efficiency MOSFETs for bipolar two-phase stepper motors. It delivers up to 7 A RMS motor current, supports microstepping resolution up to 64×, and integrates StallGuard™ sensorless stall detection and mixed-decay chopper control. It operates from 7–36 V motor supply and 3.3–5.5 V logic supply, targeting compact, high-power-density motion systems in lab automation and medical devices.

For engineers reviewing the TMC249A-LA-T datasheet, TMC249A-LA-T pinout, TMC249A-LA-T application, or TMC249A-LA-T equivalent, key selection considerations include its QFN32 package with exposed thermal pad, SPI + analog dual-interface flexibility, real-time load measurement via StallGuard™, low-noise chopper operation, and integrated diagnostics including open-load, overtemperature (2-level), and overcurrent detection.

Technical Context

The TMC249A-LA-T implements a HVCMOS-based dual full-bridge gate driver architecture that directly controls eight external N- and P-channel MOSFETs-four per phase-with programmable current regulation via internal 4-bit DACs and external sense resistors. Its chopper operates in mixed-decay mode with slope-controlled switching edges to reduce EMI, and features an on-chip oscillator or external clock input for timing control.

StallGuard™ functionality derives mechanical load estimation from back-EMF analysis during sine-wave commutation, delivering a 3-bit digital load indicator updated once per full step. The device supports two mutually exclusive control modes: SPI-configurable digital mode (with 12-bit command/status words) and standalone analog mode using INA/INB voltage inputs and PHA/PHB polarity signals-enabling seamless integration with microcontrollers or legacy analog motion controllers.

Key Specifications

Parameter	Value and Actual Design Meaning
Motor Current	Up to 7 A RMS-achieved by driving external low-R_DS(on) MOSFETs; enables high-torque stepper control without integrated power stage limitations.
Microstep Resolution	Up to 64 microsteps per full step-programmable via SPI or analog interface; ensures smooth, low-vibration motion at low speeds.
Supply Voltage Range	7–36 V DC motor supply (VS); 3.0–5.5 V DC logic supply (VCC)-supports wide industrial and medical DC bus voltages.
StallGuard™ Output	3-bit digital load indicator (LD2–LD0)-provides real-time, sensorless stall detection and homing capability without external switches or encoders.
Protection Features	Overvoltage (via ENN pin), overtemperature (2-level warning/shutdown), short-circuit, and open-load detection-ensures robust operation in unattended equipment.
Interface Options	SPI serial (12-bit command/status) and classical analog/digital (INA/INB + PHA/PHB)-offers firmware-driven precision or hardware-simple standalone control.
Package	7 × 7 mm² QFN32 with exposed thermal pad-optimized for thermal dissipation and PCB space efficiency in miniaturized motion modules.

Pinout & Package

Package: 7 × 7 mm² QFN32 with exposed thermal pad (connected to GND for optimal thermal performance).

Pin/Terminal	Circuit Role	Design Meaning
HA1, HA2, HB1, HB2	High-side gate drive outputs	Drive P-channel MOSFET sources; configured per bridge A/B; require external bootstrap or charge-pump circuitry.
LA1, LA2, LB1, LB2	Low-side gate drive outputs	Drive N-channel MOSFET sources; paired with HA/HB pins to form full H-bridges for each motor phase.
SRA, SRB	Current sense resistor inputs	Connect to low-side sense resistors; feed chopper comparators for real-time current regulation and open-load detection.
INA, INB	Analog current reference inputs	Accept 0–3 V analog voltage to scale full-scale coil current; enable fine-grained current tuning independent of SPI settings.
PHA, PHB	Digital phase polarity inputs	Set current direction per phase in standalone mode; toggle for full-step or microstep commutation when used with analog current control.
SDI, SDO, SCK, CSN, SPE	SPI interface signals	Enable bidirectional 12-bit register access; SPE must be high to activate SPI mode; CSN active-low enables command latching.
ENN	Enable / Overvoltage shutdown input	Active-low enable; pulled low for normal operation; rising edge triggers overvoltage shutdown and disables all outputs.
SLP	Slope control resistor terminal	Connect external resistor to GND to set slew rate of gate drivers-reduces EMI and dv/dt stress on MOSFETs and PCB traces.

Key Features

Feature	Design Value
StallGuard™ sensorless load measurement	Delivers 3-bit digital load indicator updated per full step-enables reliable switchless homing and stall detection in medical pumps and lab handlers.
Mixed-decay chopper operation	Automatically blends fast and slow decay phases per coil-reduces torque ripple and audible noise while maintaining current accuracy at microstep boundaries.
Slope-controlled gate drivers	Adjustable edge rate via external SLP resistor-lowers electromagnetic emissions to meet CISPR 32 Class B requirements in sensitive instrumentation.
Dual-control interface support	Full feature parity between SPI-configurable mode and analog/digital standalone mode-allows migration from legacy designs without firmware rewrite.
Integrated diagnostics	Real-time flags for open load (OLA/OLB), overtemperature (OT/OTPW), undervoltage (UV), and overcurrent (OCA/OCB/OCHS)-simplifies system-level fault logging and recovery.

Applications

Lab Automation	Medical Fluid Handling
Use Scenario: Precision syringe positioning in automated liquid dispensers and pipetting robots. IC Role / Device Role / Timing Role: Dual full-bridge gate driver controlling external MOSFETs to deliver precise 64× microstepped motion with StallGuard™-verified end-of-travel detection. Use Value: Eliminates need for limit switches or optical encoders-reducing BOM count and mechanical complexity while ensuring repeatable sub-microliter dosing accuracy.	Use Scenario: Motorized valve actuation in dialysis machines and infusion pumps requiring silent, reliable operation. IC Role / Device Role / Timing Role: High-current (7 A RMS), low-EMI stepper driver with slope control and mixed-decay chopper enabling near-silent motor movement during patient treatment. Use Value: Meets IEC 60601-1 EMC requirements and avoids acoustic disturbance-critical for clinical environments where noise impacts patient comfort and monitoring fidelity.
Office Equipment	Antenna Positioning Systems
Use Scenario: Paper path transport and scanner head movement in multifunction printers and document scanners. IC Role / Device Role / Timing Role: Compact QFN32 driver enabling high-torque, low-vibration motion under tight thermal constraints in space-constrained printer chassis. Use Value: Reduces motor heating and paper jam risk via smart current control-extending service life and minimizing maintenance in high-volume office deployments.	Use Scenario: Azimuth/elevation adjustment of satellite or radar antennas in outdoor telecom infrastructure. IC Role / Device Role / Timing Role: Robust gate driver with overtemperature (2-level), overvoltage, and open-load protection-operating reliably across -40°C to +125°C ambient ranges. Use Value: Ensures fail-safe positioning and diagnostic visibility during remote operation-preventing misalignment-induced signal loss without on-site technician intervention.

Lab Automation

Medical Fluid Handling

Use Scenario: Precision syringe positioning in automated liquid dispensers and pipetting robots.

IC Role / Device Role / Timing Role: Dual full-bridge gate driver controlling external MOSFETs to deliver precise 64× microstepped motion with StallGuard™-verified end-of-travel detection.

Use Value: Eliminates need for limit switches or optical encoders-reducing BOM count and mechanical complexity while ensuring repeatable sub-microliter dosing accuracy.

Use Scenario: Motorized valve actuation in dialysis machines and infusion pumps requiring silent, reliable operation.

IC Role / Device Role / Timing Role: High-current (7 A RMS), low-EMI stepper driver with slope control and mixed-decay chopper enabling near-silent motor movement during patient treatment.

Use Value: Meets IEC 60601-1 EMC requirements and avoids acoustic disturbance-critical for clinical environments where noise impacts patient comfort and monitoring fidelity.

Office Equipment

Antenna Positioning Systems

Use Scenario: Paper path transport and scanner head movement in multifunction printers and document scanners.

IC Role / Device Role / Timing Role: Compact QFN32 driver enabling high-torque, low-vibration motion under tight thermal constraints in space-constrained printer chassis.

Use Value: Reduces motor heating and paper jam risk via smart current control-extending service life and minimizing maintenance in high-volume office deployments.

Use Scenario: Azimuth/elevation adjustment of satellite or radar antennas in outdoor telecom infrastructure.

IC Role / Device Role / Timing Role: Robust gate driver with overtemperature (2-level), overvoltage, and open-load protection-operating reliably across -40°C to +125°C ambient ranges.

Use Value: Ensures fail-safe positioning and diagnostic visibility during remote operation-preventing misalignment-induced signal loss without on-site technician intervention.

Equivalent & Alternatives

The following parts are listed as comparable options for similar stepper motor gate driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TMC249A-SA	Same silicon die, but in SO28 package (10 × 18 mm²); lacks exposed thermal pad; higher thermal resistance (R_θJA = 45°C/W vs. 32°C/W for QFN32).	Better suited for through-hole assembly or legacy SOIC footprints; less optimal for high-current, thermally constrained PCBs.	Select TMC249A-SA only when board layout requires SOIC compatibility or manual rework feasibility outweighs thermal performance needs.
TMC2209-LA	Integrated MOSFETs (2 A RMS), smaller QFN32 footprint; no external MOSFET support; lacks StallGuard™ and analog interface.	Targeted at cost-sensitive, lower-current applications (e.g., 3D printer extruders); not suitable for >3 A or sensorless homing use cases.	Choose TMC2209-LA only for compact, self-contained stepper drives where external MOSFET flexibility and StallGuard™ are unnecessary.

Compared with TMC249A-SA, the TMC249A-LA-T offers superior thermal performance and space efficiency; compared with TMC2209-LA, it provides scalable current handling, sensorless homing, and dual-interface versatility-making it the only option supporting high-power, switchless, and field-upgradable motion systems.

Availability

TMC249A-LA-T is available at Aetrix Electronics and suitable for lab automation, medical fluid handling, and antenna positioning systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for FDA- or IEC-compliant designs.

Supply support for TMC249A-LA-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

TRINAMIC Motion Control GmbH & Co. KG is a German semiconductor company specializing in high-precision motion control ICs, founded in Hamburg in 1997 and acquired by Maxim Integrated (now part of Analog Devices) in 2021.

The TMC249A-LA-T belongs to TRINAMIC's high-power external-MOSFET stepper driver family, engineered for applications demanding scalable current, sensorless intelligence, and minimal external components-especially in medical, analytical, and industrial motion systems.

FAQ

What is the maximum motor current supported by the TMC249A-LA-T?

The TMC249A-LA-T itself does not source motor current-it drives external MOSFETs to achieve up to 7 A RMS per phase. Actual current depends on selected MOSFETs, PCB layout, heatsinking, and ambient temperature. The datasheet specifies 7 A RMS as the validated system-level capability using recommended MOSFETs and thermal design practices. For sustained 7 A operation, proper copper area and thermal vias under the QFN32 exposed pad are mandatory.

Does the TMC249A-LA-T integrate power MOSFETs?

No, the TMC249A-LA-T is a gate driver IC-not a fully integrated motor driver. It provides eight high- and low-side gate drive outputs (HA1–HB2, LA1–LB2) to control external N- and P-channel MOSFETs. This architecture allows designers to select MOSFETs optimized for voltage, current, R_DS(on), and thermal performance-making the TMC249A-LA-T ideal for custom high-power stepper solutions where integrated drivers would be thermally or electrically limiting.

How does StallGuard™ work on the TMC249A-LA-T, and what output does it provide?

StallGuard™ on the TMC249A-LA-T estimates mechanical load by analyzing back-EMF during sine-wave commutation, producing a 3-bit digital load indicator (LD2–LD0) updated once per full step. Values range from 0 (stall imminent) to 7 (no load). The indicator is accessible via SPI status word bits 11–9 and can trigger homing or stall response without external sensors. It requires mixed-decay to be disabled near zero-crossing for accurate readings-detailed in section 3.1 of the TMC249A-LA-T datasheet.

Can the TMC249A-LA-T operate without a microcontroller?

Yes, the TMC249A-LA-T supports standalone analog/digital control mode. With ANN tied low, INA/INB analog voltage inputs set coil current magnitude, while PHA/PHB digital signals control polarity-enabling full- or microstepping without SPI. This mode is ideal for simple motion profiles or legacy systems. However, advanced features like StallGuard™ readout, dynamic current scaling, or diagnostics require SPI communication with a host controller.

What package type and thermal characteristics define the TMC249A-LA-T?

The TMC249A-LA-T uses a 7 × 7 mm² QFN32 package with an exposed thermal pad. When soldered to a 4-layer PCB with ≥4 thermal vias under the pad connected to a solid GND plane, its junction-to-ambient thermal resistance (R_θJA) is 32°C/W. This enables reliable 7 A RMS operation at +85°C ambient-if ambient exceeds 85°C, derating or forced airflow is required. The SO28 variant (TMC249A-SA) has higher R_θJA (45°C/W) and is less thermally efficient.

TMC249A-LA-T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: stallGuard™

Package/Case:: 32-VQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Motor Type - Stepper:: Bipolar

Motor Type - AC, DC:: -

Function:: Controller - Commutation, Direction Management

Output Configuration:: Half Bridge (4)

Interface:: PWM, SPI

Technology:: Power MOSFET

Step Resolution:: 1 ~ 1/64

Applications:: General Purpose

Current - Output:: 7A

Voltage - Supply:: 7V ~ 36V

Voltage - Load:: 7V ~ 36V

Operating Temperature:: -50°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-QFN (7x7)

TMC249A-LA-T FAQ

1.How can I place an order for TMC249A-LA-T through Aetrix?

Please submit a Request for Quotation (RFQ) for TMC249A-LA-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 TMC249A-LA-T reliable?

The price and inventory of TMC249A-LA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMC249A-LA-T is usually 5 days.

3.What payment methods are accepted for TMC249A-LA-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMC249A-LA-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TMC249A-LA-T?

TMC249A-LA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TMC249A-LA-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 TMC249A-LA-T?

For technical support, including TMC249A-LA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMC249A-LA-T requirements.

6.How does Aetrix verify that TMC249A-LA-T is sourced from the original manufacturer or authorized distributors?

All TMC249A-LA-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 TMC249A-LA-T meets industry standards.

7.What is the process for return or replacement of TMC249A-LA-T?

All TMC249A-LA-T units undergo pre-shipment inspection (PSI). If there is an issue with TMC249A-LA-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 TMC249A-LA-T part is unused and in its original packaging.

Return procedure for TMC249A-LA-T:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 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…

2026-09-01 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…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…