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Allegro MicroSystems A3932SEQ
- Part No.:
- A3932SEQ
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
A3932SEQ.pdf
- Description:
- IC MOTOR DRIVER 18V-50V 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,040
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Product details
Overview
A3932SEQ from Allegro MicroSystems is a discontinued three-phase N-channel MOSFET controller for bipolar brushless DC motor drives, supporting motor supply voltages up to 50 V, featuring integrated 5 V reference (VLCAP), high-current gate drive (100 mA bootstrap charge), fixed off-time PWM current control, and Hall-sensor-based 120° commutation logic - used in industrial fans, power tools, and HVAC blowers.
For engineers reviewing the A3932SEQ datasheet, A3932SEQ pinout, A3932SEQ application, or A3932SEQ equivalent, key selection considerations include its 38-pin TSSOP package, synchronous rectification support, adjustable dead time via external resistor, thermal shutdown at 165°C, and discontinuation status requiring transition planning.
Technical Context
The A3932SEQ implements Hall-input-driven six-step commutation for BLDC motors with internal logic that sequences high-side (GHA/GHB/GHC) and low-side (GLA/GLB/GLC) gate outputs based on H1/H2/H3 states. It uses bootstrapped high-side drive with monitored gate voltage validation before turn-on and during conduction.
Current regulation employs a fixed off-time PWM architecture where peak load current is set by REF voltage and external sense resistor (IPEAK = VREF/RS), while blank time and off-time duration are configured via RC network on the RC pin. Synchronous rectification (SR input) enables active decay path selection between fast/slow modes controlled by MODE input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Motor Supply Voltage | Up to 50 V - supports wide-range industrial and automotive-grade BLDC systems without external step-up. |
| Gate Drive Current | 100 mA bootstrap charge - ensures rapid charging of external bootstrap capacitors for reliable high-side N-MOSFET operation. |
| Reference Voltage | 5.0 V ±0.25 V (VLCAP) - stable internal analog reference for REF/SENSE comparator and logic biasing. |
| Thermal Shutdown | 165°C junction temperature - latched fault with 10°C hysteresis prevents thermal runaway in enclosed motor drives. |
| Dead Time Range | 100 ns to 5.5 µs - externally adjustable via DEAD pin resistor to prevent shoot-through in discrete MOSFET bridges. |
| Current Sense Input Range | –5 V to +1.5 V - accommodates bidirectional current sensing and noise rejection during PWM transitions. |
| Logic Supply | VREG regulated output: 12.4–13.6 V @ –10 mA (VBB ≥18 V) - powers gate drivers and bootstrap circuits independently of motor rail. |
Pinout & Package
Package: 38-pin TSSOP (suffix LD), 9.7 mm × 4.4 mm body, 0.5 mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SA/SB/SC | Motor phase outputs | Direct connection points to motor windings; serve as return paths for bootstrap capacitor charging and high-side floating supply references. |
| GHA/GHB/GHC | High-side gate drivers | Drive gates of external N-channel high-side MOSFETs; output swing up to VBB + 17 V with 12.8 V typical high-level voltage. |
| GLA/GLB/GLC | Low-side gate drivers | Drive gates of external N-channel low-side MOSFETs; sink/source capability supports slew-rate control via external series resistors. |
| H1/H2/H3 | Hall sensor inputs | 120°-spaced digital inputs with internal 5 V pull-ups; decode rotor position to determine commutation sequence. |
| REF/SENSE | Current limit reference & sense | REF sets peak current threshold (IPEAK = VREF/RS); SENSE compares sensed voltage against REF with 0.91 µs blanking window. |
| DEAD | Dead time adjustment | Analog input tied to LCAP via resistor; configures turn-off-to-turn-on delay (100 ns–5.5 µs) to prevent cross-conduction in bridge FETs. |
| FAULT/TACH | Fault reporting & speed feedback | Open-drain outputs pulled to VLCAP; FAULT asserts on Hall error, UVLO, thermal shutdown, or short-to-ground; TACH pulses per Hall transition. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification control | Enables active current decay path selection (fast/slow mode) via SR and MODE inputs - reduces power loss vs. body-diode conduction and eliminates need for clamp diodes. |
| Adjustable dead time | Externally programmable 100 ns–5.5 µs delay via DEAD pin resistor - prevents shoot-through across high- and low-side FETs during switching transitions. |
| Integrated 5 V reference (VLCAP) | Stable ±5% reference for REF, SENSE, and logic biasing - eliminates need for external regulator in most BLDC drive designs. |
| Motor lead short-to-ground detection | Monitors VDS > 2.0 V on high-side FETs during ON state - flags fault and disables affected phase while clearing automatically at next commutation. |
| Brake and coast functions | BRAKE input forces low-side FETs ON for dynamic braking; RESET input overrides all controls to force coast (all FETs OFF) - critical for fail-safe motor stop. |
Applications
| Industrial Fans | Power Tools |
|---|---|
Use Scenario: Constant-speed or variable-torque ventilation systems in HVAC and factory enclosures. IC Role / Device Role / Timing Role: Three-phase gate driver coordinating Hall-based commutation and current-limited PWM to regulate airflow and torque under varying load. Use Value: Enables compact, efficient fan drives using cost-effective discrete N-MOSFETs with integrated protection against overcurrent and thermal overload. |
Use Scenario: Cordless drill and angle grinder motor control with rapid acceleration/deceleration demands. IC Role / Device Role / Timing Role: High-current gate controller managing 100% duty cycle operation, synchronous rectification, and dynamic braking via BRAKE input. Use Value: Delivers high peak torque with minimal heat buildup through fast-decay current control and thermal shutdown at 165°C. |
| Automotive Blowers | Medical Pumps |
Use Scenario: Cabin air circulation systems requiring EMI-robust, thermally stable motor control. IC Role / Device Role / Timing Role: Motor controller interfacing with Hall sensors and regulating current via REF/SENSE loop to maintain consistent airflow across battery voltage range (12–50 V). Use Value: Supports 12 V system compatibility via VBB–VREG shorting while maintaining undervoltage lockout at 9.7 V for reliable startup. |
Use Scenario: Precision fluid delivery in infusion pumps where silent, jitter-free motor operation is essential. IC Role / Device Role / Timing Role: Low-noise BLDC driver using fixed off-time PWM with adjustable blank time (RC network) to suppress false current-limit triggering during diode recovery. Use Value: Ensures smooth micro-stepped rotation via precise current regulation and minimized audible switching noise (<50 µs off-time). |
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 IC with enhanced thermal performance (RθJA = 42°C/W), wider VBB range (up to 60 V), and improved fault diagnostics including overtemperature flag. | Supports higher-power BLDC systems and longer continuous-duty cycles; requires updated PCB layout due to different pinout and RC timing behavior. | Recommended for new designs requiring production longevity and extended voltage margin. |
| MP6532DJ-LF-Z | Monolithic 3-phase gate driver (no Hall logic); requires external MCU for commutation; integrates bootstrap diodes and offers 1.2 A peak gate drive. | Best suited for firmware-controlled BLDC systems with custom timing; lacks integrated Hall decoder, REF/SENSE comparator, and TACH output. | Preferred when design flexibility and higher gate current outweigh need for autonomous Hall-based operation. |
Compared with A3932SEQ, A3938SLDTR-T provides direct functional continuity with updated protection and thermal specs, while MP6532DJ-LF-Z shifts responsibility for commutation logic to an external controller - making it suitable only where MCU-based motor control is already implemented.
Availability
A3932SEQ is available at Aetrix Electronics and suitable for legacy repair, end-of-life replacement, and backward-compatible redesigns requiring stable component supply for industrial fans, power tools, and HVAC blower systems.
Supply support for A3932SEQ 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 since 1989.
The A3932 product line was engineered specifically for cost-sensitive, Hall-based BLDC motor drives in industrial and consumer appliances - emphasizing integration of gate drive, current control, and fault protection in a single TSSOP package.
FAQ
Is A3932SEQ still in production?
No, A3932SEQ is a discontinued product. Allegro MicroSystems ceased production effective June 1, 2016. It is not recommended for new designs. A3932SEQ remains available through Aetrix Electronics for legacy support and repair, but inventory is finite and subject to allocation.
What is the correct replacement for A3932SEQ?
The officially recommended replacement is A3938SLDTR-T, which shares functional equivalence in Hall-based three-phase control, synchronous rectification, and current limiting, while offering improved thermal resistance and extended voltage range. A3932SEQ users should consult Allegro's transition guide for layout and timing adjustments.
Does A3932SEQ support 12 V motor supply operation?
Yes, A3932SEQ supports 12 V operation by shorting VBB to VREG, but VREG must not exceed 15 V absolute maximum - including transients. For noisy 12 V systems, use VREG in regulator mode with proper decoupling; note that VREG output may fall below specification if VBB < 18 V.
How does the A3932SEQ implement current limiting?
A3932SEQ uses internal fixed off-time PWM current control: peak current is set by VREF and external sense resistor (IPEAK = VREF/RS). When SENSE voltage reaches VREF, the high-side driver turns off and current decays for a user-defined off-time (set by RC network). Blank time prevents false triggering during MOSFET switching.
What protection features does A3932SEQ include?
A3932SEQ includes motor lead short-to-ground detection (via VDS monitoring), thermal shutdown at 165°C with 10°C hysteresis, VREG undervoltage lockout (9.7 V turn-on threshold), bootstrap capacitor charge current monitoring, and Hall-input code validation (rejects 000/111 states). All faults trigger FAULT output and force coast or brake mode.
A3932SEQ 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 FAQ
1.How can I place an order for A3932SEQ through Aetrix?
Please submit a Request for Quotation (RFQ) for A3932SEQ 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 reliable?
The price and inventory of A3932SEQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A3932SEQ is usually 5 days.
3.What payment methods are accepted for A3932SEQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A3932SEQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A3932SEQ?
A3932SEQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A3932SEQ 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?
For technical support, including A3932SEQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A3932SEQ requirements.
6.How does Aetrix verify that A3932SEQ is sourced from the original manufacturer or authorized distributors?
All A3932SEQ 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 meets industry standards.
7.What is the process for return or replacement of A3932SEQ?
All A3932SEQ units undergo pre-shipment inspection (PSI). If there is an issue with A3932SEQ, 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 part is unused and in its original packaging.
Return procedure for A3932SEQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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