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Allegro MicroSystems A3932SEQ-T
- Part No.:
- A3932SEQ-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
A3932SEQ-T.pdf
- Description:
- IC MOTOR DRIVER 18V-50V 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,627
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Product details
Overview
A3932SEQ-T from Allegro MicroSystems is a discontinued three-phase N-channel MOSFET controller IC for bipolar brushless DC motor commutation, featuring 50 V motor supply support, internal 5 V reference and 13 V regulated gate-drive supply, fixed off-time PWM current control, and Hall-sensor-based 120° commutation logic. It drives external power stages in industrial fans, HVAC blowers, and power tools.
For engineers reviewing the A3932SEQ-T datasheet, A3932SEQ-T pinout, A3932SEQ-T application, or A3932SEQ-T equivalent, key selection considerations include its 38-pin TSSOP package, synchronous rectification capability, adjustable dead time via external resistor, thermal shutdown at 165°C, and discontinuation status requiring design migration planning.
Technical Context
The A3932SEQ-T implements Hall-input-driven 120° commutation logic with DIR and BRAKE inputs for direction reversal and dynamic braking. Its high-current gate drivers (100 mA bootstrap charge, 11.6 V typical high-side output) support N-channel MOSFETs in half-bridge configurations with bootstrapped high-side drive.
Current regulation uses an internal fixed off-time PWM circuit controlled by REF and SENSE analog inputs, with blanking time set by RC network to suppress switching transients. Protection includes motor-lead short-to-ground detection (2.0 V threshold), undervoltage lockout (9.7 V turn-on), and fault-latched open-drain FAULT output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Motor Supply Voltage | Up to 50 V - supports wide-range BLDC motor systems without external step-down regulation. |
| Gate Drive Output | High-side: 11.6 V typical (VREG = 13 V); low-side: VREG − 0.5 V - ensures robust N-MOSFET turn-on with margin above VGS(th). |
| Current Limit Accuracy | ±5 mV input offset - enables precise peak current setting via external sense resistor and REF voltage. |
| Thermal Shutdown | 165°C junction temperature with 10°C hysteresis - prevents irreversible damage during overload or poor heatsinking. |
| Dead Time Range | 100 ns to 5.5 µs via DEAD pin resistor - configurable cross-conduction protection for diverse MOSFET gate charge characteristics. |
| Bootstrap Charge Current | 100 mA - sustains high-side gate drive during 100% duty cycle operation without external charge pump. |
| Tachometer Output | Open-drain pulse per Hall transition - provides direct speed feedback without additional signal conditioning. |
Pinout & Package
Package: 38-pin TSSOP (suffix LD), 9.7 mm × 4.4 mm body, 0.5 mm pitch, lead (Pb)-free with 100% matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SA/SB/SC | Motor phase outputs | Direct connection to motor windings; serve as negative return for bootstrap capacitors and sense points for short-to-ground protection. |
| GHA/GHB/GHC | High-side gate drivers | Drive gates of external high-side N-MOSFETs; require external series resistors to control dv/dt and prevent shoot-through. |
| GLA/GLB/GLC | Low-side gate drivers | Drive gates of external low-side N-MOSFETs; sink/source current to control slew rate and EMI. |
| CA/CB/CC | Bootstrap capacitor positive terminals | Supply floating high-side gate drive; charged to ~VREG when associated Sx is low, enabling N-MOSFET high-side operation. |
| H1/H2/H3 | Hall sensor inputs | 120° spaced digital inputs with internal 5 V pull-up; decode rotor position for commutation sequence. |
| REF/SENSE | Current limit reference and sense inputs | Set IPEAK = VREF/RSENSE; SENSE compares winding current against REF with 0.91 µs blanking window. |
| DEAD | Dead time adjustment | Analog input setting turn-off to turn-on delay (100 ns–5.5 µs) via external resistor to LCAP to prevent cross-conduction. |
| FAULT | Fault indicator | Open-drain output asserting low on Hall invalid code, VREG UVLO, thermal shutdown, or SA/SB/SC short-to-ground. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification control | Enables low-loss current decay path through active MOSFETs instead of body diodes, reducing power dissipation and eliminating need for clamp diodes. |
| Selectable fast/slow current decay | MODE pin selects decay mode: fast decay (both FETs off) for rapid torque response; slow decay (high-side only off) for smoother operation and lower EMI. |
| Internal 5 V reference (LCAP) | Stable 5.0 V ±2.5% reference powering DEAD, TACH, and FAULT pull-ups; supports ≤3 mA total load without external regulator. |
| Brake input with priority override | BRAKE = 0 forces all low-side FETs on and high-side FETs off for dynamic braking; RESET = 1 overrides BRAKE to coast motor. |
| 100% duty cycle capability | Bootstrapped high-side drive maintains >9 V gate voltage even at continuous conduction, enabling full-speed operation without loss of high-side control. |
Applications
| Industrial Fan Control | HVAC Blower Systems |
|---|---|
|
Use Scenario: Variable-speed centrifugal fan in commercial HVAC units requiring precise airflow regulation and energy efficiency. IC Role / Device Role / Timing Role: Three-phase gate driver controlling external N-MOSFET bridge; executes Hall-based commutation and regulates peak winding current via REF/SENSE. Use Value: Synchronous rectification reduces MOSFET conduction losses by up to 40% versus body-diode decay, lowering thermal stress and enabling smaller heatsinks. |
Use Scenario: High-static-pressure blower in rooftop HVAC units operating across wide ambient temperatures (−20°C to +85°C). IC Role / Device Role / Timing Role: Motor controller providing thermal shutdown (165°C), undervoltage lockout (9.7 V), and motor-lead short detection to ensure field reliability. Use Value: Adjustable dead time (via DEAD pin) accommodates MOSFET gate charge variation across temperature, preventing shoot-through in harsh environments. |
| Power Tool Motor Drive | Automated Gate Operator |
|
Use Scenario: Cordless drill with brushed-DC replacement BLDC motor demanding high starting torque and dynamic braking. IC Role / Device Role / Timing Role: Commutation controller using DIR and BRAKE inputs for bidirectional rotation and emergency stop; TACH output feeds microcontroller for closed-loop speed control. Use Value: Internal 13 V VREG supply powers gate drivers and bootstrap circuits independently of battery sag, maintaining consistent MOSFET turn-on performance down to 12 V. |
Use Scenario: Residential garage door opener requiring quiet, reliable motor control with stall detection and auto-reverse safety logic. IC Role / Device Role / Timing Role: Fault-monitoring controller using FAULT output to detect stalled motor (short-to-ground condition) and trigger microcontroller safety response. Use Value: Latched short-to-ground fault cleared automatically each commutation cycle allows recovery from transient stalls without full system reset. |
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 (±4 kV HBM), improved thermal resistance (RθJA = 42°C/W vs. 51°C/W), and updated fault reporting granularity. | Designed for new designs requiring extended product lifecycle support; not pin-compatible due to revised pinout (e.g., relocated RC and SENSE pins). | Recommended for new designs; requires PCB layout revision and firmware adaptation for FAULT and TACH timing changes. |
| MP6532GQ-Z | Monolithic 3-phase gate driver (integrated high-/low-side drivers) with 60 V rating, but lacks Hall commutation logic and internal current regulation. | Requires external MCU for commutation sequencing and current loop control; suitable where space constraints outweigh integration benefits. | Consider only when replacing A3932SEQ-T in cost-sensitive, low-volume applications where MCU resources are available for motor control. |
Compared with A3932SEQ-T, A3938SLDTR-T offers longer-term availability and improved thermal performance but demands board redesign, while MP6532GQ-Z reduces BOM count at the expense of added firmware complexity and loss of integrated Hall decoding.
Availability
A3932SEQ-T is available at Aetrix Electronics and suitable for legacy repair, end-of-life component replacement, and maintenance programs requiring stable component supply for industrial fans, HVAC blowers, and power tools.
Supply support for A3932SEQ-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 A3932 product line was developed specifically for cost-effective, Hall-sensor-based BLDC motor control in industrial and consumer appliances, emphasizing gate drive robustness, integrated protection, and ease of current-loop implementation.
FAQ
Is A3932SEQ-T still in production?
No, A3932SEQ-T is a discontinued product. Allegro MicroSystems ceased production effective June 1, 2016. It is no longer recommended for new designs, and samples are unavailable. Aetrix Electronics supplies remaining inventory for legacy repair and maintenance use only. For new projects, A3932SEQ-T migration paths must be evaluated early in the design cycle.
What does the '–S–' suffix in A3932SEQ-T indicate?
The '–S–' suffix in A3932SEQ-T specifies an operating ambient temperature range of −20°C to +85°C. This defines the validated environmental envelope for guaranteed electrical performance and reliability. The '–LD–' denotes the 38-pin TSSOP package, '–TR–' indicates tape-and-reel packaging (4000 units per reel), and '–T' confirms lead-free construction with 100% matte tin leadframe plating.
Can A3932SEQ-T drive P-channel high-side MOSFETs?
No, A3932SEQ-T is designed exclusively for N-channel MOSFETs in both high-side and low-side positions. Its high-side drivers use bootstrapped architecture requiring a floating positive supply (CA/CB/CC) referenced to SA/SB/SC, which is incompatible with P-channel gate drive requirements. External level-shifting circuitry would be needed - but is not supported by A3932SEQ-T's internal logic or protection features.
How does the A3932SEQ-T handle motor stall conditions?
A3932SEQ-T detects motor stall via its motor-lead short-to-ground protection: when a high-side FET is enabled and >2.0 V is measured between VBB and SA/SB/SC, it asserts FAULT and disables high-side drivers only (latching fault). The fault clears automatically at each commutation step. If stall persists, toggling RESET or cycling power is required to restore operation - a behavior confirmed in the Applications Information section of the A3932SEQ-T datasheet.
What is the function of the LCAP pin on A3932SEQ-T?
The LCAP pin on A3932SEQ-T connects to a 0.1 µF decoupling capacitor for the internal 5 V reference regulator. It serves as the reference node for DEAD, TACH, and FAULT open-drain outputs and sources up to 3 mA total current. LCAP must be placed adjacent to AGND with minimal trace length; improper decoupling causes instability in dead time setting, tachometer pulses, and fault reporting accuracy in the A3932SEQ-T.
A3932SEQ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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)
A3932SEQ-T FAQ
1.How can I place an order for A3932SEQ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A3932SEQ-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 A3932SEQ-T reliable?
The price and inventory of A3932SEQ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A3932SEQ-T is usually 5 days.
3.What payment methods are accepted for A3932SEQ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A3932SEQ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A3932SEQ-T?
A3932SEQ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A3932SEQ-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 A3932SEQ-T?
For technical support, including A3932SEQ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A3932SEQ-T requirements.
6.How does Aetrix verify that A3932SEQ-T is sourced from the original manufacturer or authorized distributors?
All A3932SEQ-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 A3932SEQ-T meets industry standards.
7.What is the process for return or replacement of A3932SEQ-T?
All A3932SEQ-T units undergo pre-shipment inspection (PSI). If there is an issue with A3932SEQ-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 A3932SEQ-T part is unused and in its original packaging.
Return procedure for A3932SEQ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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