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Allegro MicroSystems A3936SEDTR-T
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- Part No.:
- A3936SEDTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
A3936SEDTR-T.pdf
- Description:
- IC MOTOR DRIVER 3V-5.5V 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,374
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Product details
Overview
A3936SEDTR-T from Allegro MicroSystems is a DMOS three-phase PWM motor driver IC designed for brushless DC (BLDC) motor control in industrial and automotive subsystems, delivering ±3 A peak output current at up to 50 V supply, with configurable slow/fast/mixed-decay current regulation and integrated synchronous rectification for thermal efficiency.
For engineers reviewing the A3936SEDTR-T datasheet, A3936SEDTR-T pinout, A3936SEDTR-T application, or A3936SEDTR-T equivalent, this device supports Hall-sensor-based commutation, tachometer feedback, brake and sleep modes, and fixed off-time PWM timing - critical for precision BLDC speed and torque control in motion systems.
Technical Context
The A3936SEDTR-T integrates a three-half-bridge DMOS power stage with independent source/sink drivers (rDS(on) = 500 mΩ source / 315 mΩ sink), internal charge pump (VCP) for high-side gate drive, and regulator (VREG) for low-side biasing. It uses Hall-effect sensor inputs (HA±/HB±/HC±) to determine rotor position and commutates motor phases via six-step logic.
Current regulation employs a fixed off-time PWM controller (typically 24 µs at 4 MHz oscillator) with blanking time adjustment (via BLANK pin), zero-current detection, and crossover-current protection. Decay mode selection (PFD1/PFD2) and synchronous rectification (SR) are digitally configurable to optimize power dissipation during PWM decay cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±3 A peak - supports continuous motor winding current without external heatsinking under typical ambient conditions. |
| Supply Voltage (VBB) | Up to 50 V - enables direct interface with 24 V and 48 V industrial motor buses. |
| rDS(on) (Source/Sink) | 500 mΩ / 315 mΩ - reduces conduction loss and junction temperature rise during high-duty-cycle operation. |
| PWM Fixed Off-Time | Typically 24 µs - sets minimum current decay duration and defines maximum achievable PWM frequency. |
| Thermal Shutdown | 165°C with 15°C hysteresis - prevents latch-up and ensures safe recovery after overload or poor heatsinking. |
| Tachometer Output | Open-collector toggle per Hall transition - provides direct speed feedback for closed-loop velocity control. |
| Logic Supply Range (VDD) | 3.0–5.5 V - compatible with standard 3.3 V and 5 V microcontroller I/O domains. |
Pinout & Package
Package: 44-pin plastic leaded chip carrier (PLCC-44) with internally fused ground leads (pins 1, 2, 44; 11, 12, 13; 22, 23, 24; 33, 34, 35) for enhanced thermal performance. Ground leads are electrically common and require no isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (pins 1,2,11,12,13,22,23,24,33,34,35,44) | Power and signal ground reference | Multiple fused ground pins reduce impedance and improve thermal conduction to PCB ground plane. |
| HA±, HB±, HC± (pins 3–8) | Hall-effect sensor inputs | Accept differential Hall signals for 120° electrical spacing; support commutation logic without external conditioning. |
| OUTA/OUTB/OUTC (pins 17,21,28) | Half-bridge outputs | Drive motor phase windings; each connects to one leg of three-phase BLDC topology. |
| VBB1/VBB2 (pins 19,26) | High-voltage load supply inputs | Dual VBB pins distribute current and reduce trace inductance for stable high-current switching. |
| VCP/CP1/CP2 (pins 29–31) | Charge pump network | VCP is reservoir node; CP1/CP2 form flying capacitor pair to generate gate drive voltage > VBB for high-side DMOS. |
| SENSE (pin 15) | Current sense input | Connects to low-side shunt resistor; enables internal current regulation via VREF/10 scaling (ITRIP = VREF/(10×RSENSE)). |
| SLEEP (pin 32) | Low-power mode enable | Asserting low disables all internal circuitry except bias, reducing quiescent current to <100 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable decay modes (slow/fast/mixed) | Selected via PFD1/PFD2 pins - enables optimization of torque ripple, efficiency, and acoustic noise across speed/load ranges. |
| Synchronous rectification (SR) | Enables low-RDS(on) MOSFET conduction during decay - replaces body diode conduction, cutting power loss by >40% vs. asynchronous operation. |
| Integrated tachometer output (TACH) | Open-collector signal toggling on each Hall edge - eliminates need for external counter or microcontroller timer capture for RPM measurement. |
| Brake function (BRAKE) | Forces all three low-side drivers ON - provides dynamic braking by shorting motor phases, independent of PWM regulation. |
| Internal UVLO and thermal shutdown | Monitors VDD, VCP, and VREG - disables outputs if any supply falls below threshold or junction exceeds 165°C, preventing catastrophic failure. |
Applications
| Industrial Fan Control | Automotive HVAC Blower |
|---|---|
|
Use Scenario: Variable-speed centrifugal fan in programmable HVAC unit requiring quiet, energy-efficient airflow modulation. IC Role / Device Role / Timing Role: Three-phase BLDC driver executing Hall-based commutation and closed-loop speed control using tach feedback. Use Value: Synchronous rectification and mixed-decay mode reduce audible noise and heat generation at partial-load conditions, extending motor life and system reliability. |
Use Scenario: Cabin air blower in passenger vehicle with ECU-controlled speed ramping and stall detection. IC Role / Device Role / Timing Role: Motor driver with integrated brake, sleep, and fault reporting (via TACH and thermal shutdown) for ASIL-B adjacent functions. Use Value: Built-in crossover-current protection and fast-decay braking prevent shoot-through and enable rapid deceleration without external logic. |
| Medical Infusion Pump | Factory Automation Conveyor |
|
Use Scenario: Precision peristaltic pump requiring smooth, low-vibration motor rotation and accurate flow rate control. IC Role / Device Role / Timing Role: Current-regulated BLDC driver with fixed off-time PWM and zero-current detection for jitter-free microstepped motion. Use Value: ±3 A capability and 50 V rating support high-torque, low-RPM operation while maintaining sub-1% speed regulation via tach feedback. |
Use Scenario: Modular conveyor belt drive in packaging line needing robust start/stop cycling and overload resilience. IC Role / Device Role / Timing Role: High-side/lower-side gate driver with thermal hysteresis and dual VBB inputs for distributed power delivery. Use Value: Internally fused PLCC ground leads provide mechanical stability and consistent thermal resistance across repeated thermal cycles in 24/7 operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase BLDC motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STSPIN32F0A | Integrated 32-bit ARM Cortex-M0 MCU + gate drivers; requires external MOSFETs; no integrated current sense amplifier. | Supports field-oriented control (FOC); lacks Hall-input native logic and tach output; needs firmware development. | Choose when advanced control algorithms (e.g., FOC) are required and system-level integration justifies added software complexity. |
| DRV8313 | 3-A, 60-V three-phase gate driver (no power MOSFETs); supports both Hall and encoder inputs; includes current shunt amplifiers. | Requires external high- and low-side MOSFETs; offers higher voltage margin but adds BOM count and layout complexity. | Choose when higher voltage headroom (>50 V) or discrete MOSFET selection flexibility is needed, and thermal design allows external FET placement. |
Compared with STSPIN32F0A and DRV8313, the A3936SEDTR-T delivers fully integrated DMOS power stages, native Hall commutation logic, and tach feedback in a single PLCC package - simplifying layout, reducing component count, and accelerating time-to-function for cost-sensitive, Hall-based BLDC systems.
Availability
A3936SEDTR-T is available at Aetrix Electronics and suitable for industrial fan control, automotive HVAC blower systems, medical infusion pumps, and factory automation conveyors requiring stable component supply despite its Last Time Buy status.
Supply support for A3936SEDTR-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 designer and manufacturer of high-performance magnetic sensing and power IC solutions, headquartered in Worcester, Massachusetts.
The A3936SEDTR-T belongs to Allegro's legacy motor driver product line, engineered specifically for cost-effective, Hall-sensor-commutated three-phase BLDC motor control in industrial and automotive subsystems.
FAQ
What is the maximum operating voltage for the A3936SEDTR-T?
The A3936SEDTR-T supports a maximum load supply voltage (VBB) of 50 V, as specified in its Absolute Maximum Ratings. This rating applies to both VBB1 and VBB2 pins and defines the upper limit for safe continuous operation without risk of breakdown or accelerated degradation. Operation above 50 V may cause permanent damage to the internal DMOS transistors. The A3936SEDTR-T is not rated for transient overvoltage events beyond this value.
Does the A3936SEDTR-T include built-in current sensing?
The A3936SEDTR-T does not integrate a current sense amplifier but provides a dedicated SENSE pin (pin 15) that interfaces directly with an external low-value shunt resistor. Internal current regulation compares the voltage across this resistor to a scaled reference (VREF/10), enabling precise trip-point setting (ITRIP = VREF/(10×RSENSE)). No external op-amp or signal conditioning is required for basic PWM current limiting in the A3936SEDTR-T.
How does the synchronous rectification (SR) feature improve efficiency in the A3936SEDTR-T?
When SR is enabled (SR pin high), the A3936SEDTR-T actively turns on appropriate low-side MOSFETs during current decay instead of relying on body diodes. This replaces ~1.2 V diode conduction loss with ~0.3 V I×RDS(on) loss, reducing power dissipation by over 40% in typical PWM operation. The A3936SEDTR-T also disables SR automatically upon zero-current detection to prevent reverse current flow, preserving motor control integrity.
Can the A3936SEDTR-T operate without external Hall sensors?
No - the A3936SEDTR-T requires external Hall-effect sensors connected to HA±, HB±, and HC± pins to determine rotor position and execute six-step commutation. It has no sensorless back-EMF detection circuitry. The A3936SEDTR-T's internal logic is hardwired for Hall-input timing and cannot be reconfigured for sensorless operation; attempting to run without valid Hall signals results in undefined or stalled motor behavior.
What is the purpose of the fused ground leads in the A3936SEDTR-T PLCC package?
The A3936SEDTR-T's 44-pin PLCC package features 12 internally fused ground leads (grouped in sets of three per side) to lower thermal resistance and improve mechanical robustness. These fused leads act as integrated thermal vias, conducting heat directly from the die to the PCB ground plane with minimal impedance. They are electrically common and grounded, eliminating need for isolation - a key thermal design advantage over standard PLCC packages in high-current motor drive applications.
A3936SEDTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (3)
- Interface:
- Parallel
- Technology:
- DMOS
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- 3A
- Voltage - Supply:
- 3V ~ 5.5V
- Voltage - Load:
- 9V ~ 50V
- Operating Temperature:
- -20°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
A3936SEDTR-T FAQ
1.How can I place an order for A3936SEDTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A3936SEDTR-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 A3936SEDTR-T reliable?
The price and inventory of A3936SEDTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A3936SEDTR-T is usually 5 days.
3.What payment methods are accepted for A3936SEDTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A3936SEDTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A3936SEDTR-T?
A3936SEDTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A3936SEDTR-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 A3936SEDTR-T?
For technical support, including A3936SEDTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A3936SEDTR-T requirements.
6.How does Aetrix verify that A3936SEDTR-T is sourced from the original manufacturer or authorized distributors?
All A3936SEDTR-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 A3936SEDTR-T meets industry standards.
7.What is the process for return or replacement of A3936SEDTR-T?
All A3936SEDTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A3936SEDTR-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 A3936SEDTR-T part is unused and in its original packaging.
Return procedure for A3936SEDTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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