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

Allegro MicroSystems A3932SEQTR

Name: A3932SEQTR
Brand: Allegro MicroSystems
SKU: A3932SEQTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A3932SEQTR

Manufacturer:: Allegro MicroSystems

Category:: Motor Drivers, Controllers

Package:: 32-LCC (J-Lead)

Datasheet:: A3932SEQTR.pdf

Description:: IC MOTOR DRIVER 18V-50V 32PLCC

Quantity:: RFQ Add To RFQ list

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Inventory:4,151

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Product details

Overview

A3932SEQTR from Allegro MicroSystems is a discontinued three-phase N-channel MOSFET controller for bipolar brushless DC motor commutation, featuring 38-pin TSSOP package, 50 V motor supply capability, internal 5 V reference and 13 V regulated gate drive supply, and Hall-sensor-based 120° commutation logic for industrial BLDC drives.

For engineers reviewing the A3932SEQTR datasheet, A3932SEQTR pinout, A3932SEQTR application, or A3932SEQTR equivalent, key selection considerations include its fixed off-time PWM current control (set via RC network), synchronous rectification support, adjustable dead time (100 ns–5.5 µs), thermal shutdown (165°C), and motor-lead short-to-ground protection - all critical for reliable high-current motor bridge design.

Technical Context

The A3932SEQTR implements Hall-input-driven 120° commutation logic with DIR-controlled rotation reversal and BRAKE-triggered dynamic braking. Its gate drivers deliver ±50 mA peak current with 120 ns rise/fall times and integrated bootstrap charge monitoring to sustain high-side N-MOSFET operation up to 100% duty cycle.

Current regulation uses an internal comparator comparing SENSE voltage against user-set REF voltage (I_PEAK = V_REF/R_S), with blanking time (0.91 µs typical) to suppress switching transients. Protection includes undervoltage lockout (9.7 V turn-on threshold), thermal shutdown with 10°C hysteresis, and latched short-to-ground detection per phase.

Key Specifications

Parameter	Value and Actual Design Meaning
Motor Supply Voltage	Up to 50 V - supports wide-range industrial BLDC systems without external step-down
Gate Drive Output Current	±50 mA - sufficient to drive high-capacitance N-channel power MOSFETs directly
Internal Reference Voltage	5.0 V ±2.5% - stable analog reference for current-sense comparator and logic biasing
Regulated Gate Supply (VREG)	13.0 V (typ) at 10 mA - powers low-side drivers and bootstrap charging circuitry
Thermal Shutdown Threshold	165°C - protects against sustained overload or poor heatsinking in enclosed drives
Dead Time Adjustment Range	100 ns to 5.5 µs - configurable via DEAD pin resistor to prevent shoot-through in external FETs
Fixed Off-Time PWM Control	10–50 µs range set by external RC - enables precise peak current limiting independent of PWM input

Pinout & Package

Package: 38-pin TSSOP (suffix LD), 0.5 mm pitch, JEDEC MO-153 BD-1 compliant, with exposed thermal pad (not electrically connected).

Pin/Terminal	Circuit Role	Design Meaning
SA/SB/SC	Motor phase outputs	Direct connection points to BLDC motor windings; serve as return paths for bootstrap capacitor charging
GHA/GHB/GHC	High-side gate drivers	Drive gates of external high-side N-MOSFETs; bootstrapped to float above motor phase voltages
GLA/GLB/GLC	Low-side gate drivers	Drive gates of external low-side N-MOSFETs; referenced to PGND for fast switching
H1/H2/H3	Hall sensor inputs	Accept 120°-spaced digital Hall signals; internally pulled up to 5 V for noise immunity
REF/SENSE	Current limit programming	REF sets peak current (I_PEAK = V_REF/R_S); SENSE monitors shunt voltage with 5 mV offset tolerance
FAULT/TACH	Open-drain status outputs	FAULT asserts low on thermal, UVLO, Hall error, or short-to-ground; TACH pulses per Hall transition for speed feedback
DEAD	Dead time control	Analog input setting delay between high/low-side turn-off and turn-on to prevent cross-conduction
PWM/MODE/SR	Functional control inputs	PWM enables torque control; MODE selects fast/slow decay; SR enables synchronous rectification

Key Features

Feature	Design Value
Synchronous rectification control	Reduces conduction losses by replacing body-diode decay with active FET switching during PWM off-cycle
Adjustable dead time	Configurable 100 ns–5.5 µs delay prevents shoot-through across external half-bridge FETs
Integrated 5 V reference and 13 V regulator	Eliminates need for external bias supplies; VREG powers gate drivers and bootstrap circuits
Motor lead short-to-ground detection	Latched fault per phase clears automatically at next commutation - enables stall recovery without reset
Brake and coast functions	BRAKE forces low-side FETs on for dynamic braking; RESET disables all outputs for safe coasting
Thermal shutdown with hysteresis	Shuts down at 165°C and re-enables only below 155°C - prevents thermal cycling damage

Applications

Industrial BLDC Fans	Automotive HVAC Blowers
Use Scenario: Constant-speed airflow control in factory ventilation systems with dust exposure and ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Three-phase gate driver controlling external N-MOSFET half-bridges; commutates based on Hall sensor feedback with 120° timing. Use Value: Internal 13 V VREG sustains gate drive under 48 V bus transients; synchronous rectification reduces MOSFET heating by >15% vs. body-diode decay.	Use Scenario: Variable-speed cabin air circulation in passenger vehicles, requiring EMI-robust commutation and thermal resilience. IC Role / Device Role / Timing Role: Motor controller IC providing Hall-based commutation, PWM torque control, and fault reporting via FAULT/TACH pins. Use Value: Short-to-ground protection detects stalled rotor conditions; thermal shutdown (165°C) ensures compliance with automotive under-hood temperature requirements.
Medical Infusion Pumps	Power Tools with Electronic Commutation
Use Scenario: Precision fluid delivery using low-noise, low-vibration BLDC motors in hospital-grade equipment. IC Role / Device Role / Timing Role: Current-regulated motor driver enforcing strict I_PEAK limits via REF/SENSE interface and fixed off-time PWM. Use Value: 5 mV sense comparator offset ensures accurate current limiting at microamp-level sensing; blank time (0.91 µs) rejects switching noise during recirculation.	Use Scenario: Cordless drill/driver applications demanding high-torque startup and rapid direction reversal. IC Role / Device Role / Timing Role: Directional motor controller with DIR input, BRAKE function, and MODE-selectable decay for optimized torque response. Use Value: Fast-decay mode (MODE = 0) enables aggressive current reversal during direction changes; 100% duty cycle support maintains torque at zero speed.

Industrial BLDC Fans

Automotive HVAC Blowers

Use Scenario: Constant-speed airflow control in factory ventilation systems with dust exposure and ambient temperatures up to 85°C.

IC Role / Device Role / Timing Role: Three-phase gate driver controlling external N-MOSFET half-bridges; commutates based on Hall sensor feedback with 120° timing.

Use Value: Internal 13 V VREG sustains gate drive under 48 V bus transients; synchronous rectification reduces MOSFET heating by >15% vs. body-diode decay.

Use Scenario: Variable-speed cabin air circulation in passenger vehicles, requiring EMI-robust commutation and thermal resilience.

IC Role / Device Role / Timing Role: Motor controller IC providing Hall-based commutation, PWM torque control, and fault reporting via FAULT/TACH pins.

Use Value: Short-to-ground protection detects stalled rotor conditions; thermal shutdown (165°C) ensures compliance with automotive under-hood temperature requirements.

Medical Infusion Pumps

Power Tools with Electronic Commutation

Use Scenario: Precision fluid delivery using low-noise, low-vibration BLDC motors in hospital-grade equipment.

IC Role / Device Role / Timing Role: Current-regulated motor driver enforcing strict I_PEAK limits via REF/SENSE interface and fixed off-time PWM.

Use Value: 5 mV sense comparator offset ensures accurate current limiting at microamp-level sensing; blank time (0.91 µs) rejects switching noise during recirculation.

Use Scenario: Cordless drill/driver applications demanding high-torque startup and rapid direction reversal.

IC Role / Device Role / Timing Role: Directional motor controller with DIR input, BRAKE function, and MODE-selectable decay for optimized torque response.

Use Value: Fast-decay mode (MODE = 0) enables aggressive current reversal during direction changes; 100% duty cycle support maintains torque at zero speed.

Equivalent & Alternatives

The following parts are listed as comparable options for similar three-phase MOSFET controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
A3938SLDTR-T	Successor device with enhanced ESD rating, lower quiescent current (4.5 mA vs. 8 mA), and improved thermal resistance (R_θJA = 42°C/W vs. 51°C/W)	Same 38-pin TSSOP package and pin-compatible; supports identical Hall-based commutation and synchronous rectification	Select for new designs requiring extended product lifecycle and improved thermal performance in space-constrained layouts
MP6532GQ-Z	Monolithic 3-phase gate driver (no Hall logic); requires external MCU for commutation; integrates bootstrap diodes and 12 V LDO	Not Hall-input compatible; suited for sensorless or MCU-controlled BLDC systems where flexibility outweighs integration	Choose when migrating to sensorless control or when needing integrated bootstrap diodes to reduce BOM count

Compared with A3932SEQTR, A3938SLDTR-T offers direct replacement capability with improved reliability and thermal margin, while MP6532GQ-Z shifts architecture toward MCU-dependent control - making it suitable only when Hall-sensor elimination or monolithic integration is prioritized over plug-and-play commutation.

Availability

A3932SEQTR is available at Aetrix Electronics and suitable for industrial BLDC fans, automotive HVAC blowers, medical infusion pumps, and power tools requiring stable component supply despite end-of-life status.

Supply support for A3932SEQTR 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 of high-performance magnetic sensing and power ICs, specializing in motion control, current sensing, and motor driver solutions for automotive and industrial markets.

The A3932 product line was engineered specifically for cost-sensitive, Hall-sensor-based three-phase BLDC motor control in applications where discrete gate drivers and external logic would increase complexity and board area.

FAQ

Is A3932SEQTR still in production?

No, A3932SEQTR is a discontinued product. Allegro MicroSystems ceased production effective June 1, 2016. It is not recommended for new designs, and samples are no longer available. For legacy system support or repair, Aetrix Electronics maintains limited inventory with full traceability and documentation for A3932SEQTR.

What is the operating temperature range for A3932SEQTR?

The '–S–' suffix in A3932SEQTR specifies an operating ambient temperature range of –20°C to +85°C. This is validated across all electrical parameters in the datasheet, including gate drive strength, current-sense accuracy, and thermal shutdown behavior - making A3932SEQTR suitable for industrial enclosures and automotive cabin environments.

How does the A3932SEQTR implement current limiting?

A3932SEQTR uses internal fixed off-time PWM current control: load current is sensed across an external shunt resistor and compared to a user-defined REF voltage. When the SENSE voltage reaches V_REF, the high-side driver turns off for a duration set by an external RC network on the RC pin. This ensures precise, repeatable peak current limiting independent of motor speed or supply voltage for A3932SEQTR.

Can A3932SEQTR drive both high-side and low-side N-channel MOSFETs?

Yes, A3932SEQTR is designed exclusively for N-channel power MOSFETs in both high-side and low-side positions. High-side drive is achieved via bootstrapped floating supplies (CA/CB/CC pins), while low-side drivers (GLA/GLB/GLC) reference PGND. The A3932SEQTR datasheet confirms ±50 mA gate drive capability and 12.8 V high-side output voltage - sufficient for standard 10 V gate-threshold N-MOSFETs.

What protection features does A3932SEQTR include?

A3932SEQTR integrates five core protections: (1) motor lead short-to-ground detection per phase, (2) VREG undervoltage lockout (9.7 V turn-on), (3) thermal shutdown at 165°C with 10°C hysteresis, (4) bootstrap capacitor charge monitoring, and (5) Hall-input invalid code detection (000/111). All faults assert the open-drain FAULT pin and force motor coasting - critical for safety-critical A3932SEQTR deployments.

A3932SEQTR Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 32-LCC (J-Lead)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Motor Type - Stepper:: -

Motor Type - AC, DC:: Brushless DC (BLDC)

Function:: Controller - Commutation, Direction Management

Output Configuration:: Pre-Driver - Half Bridge (3)

Interface:: Parallel, PWM

Technology:: Power MOSFET

Step Resolution:: -

Applications:: General Purpose

Current - Output:: -

Voltage - Supply:: 18V ~ 50V

Voltage - Load:: -

Operating Temperature:: -20°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-PLCC (11.43x13.97)

A3932SEQTR FAQ

1.How can I place an order for A3932SEQTR through Aetrix?

Please submit a Request for Quotation (RFQ) for A3932SEQTR 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 A3932SEQTR reliable?

The price and inventory of A3932SEQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A3932SEQTR is usually 5 days.

3.What payment methods are accepted for A3932SEQTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A3932SEQTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A3932SEQTR?

A3932SEQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A3932SEQTR 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 A3932SEQTR?

For technical support, including A3932SEQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A3932SEQTR requirements.

6.How does Aetrix verify that A3932SEQTR is sourced from the original manufacturer or authorized distributors?

All A3932SEQTR 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 A3932SEQTR meets industry standards.

7.What is the process for return or replacement of A3932SEQTR?

All A3932SEQTR units undergo pre-shipment inspection (PSI). If there is an issue with A3932SEQTR, 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 A3932SEQTR part is unused and in its original packaging.

Return procedure for A3932SEQTR:

1.Submit a request within 90 days.

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

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