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Allegro MicroSystems A3932SEQTR-T
- Part No.:
- A3932SEQTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
A3932SEQTR-T.pdf
- Description:
- IC MOTOR DRIVER 18V-50V 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,426
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Product details
Overview
A3932SEQTR-T from Allegro MicroSystems is a discontinued three-phase N-channel MOSFET controller for bipolar brushless DC motor commutation, featuring 50 V motor supply support, internal 5 V reference (VLCAP), bootstrap high-side drive, and fixed off-time PWM current control with user-adjustable peak limit via REF/SENSE inputs. It integrates Hall sensor logic for 120° spacing and supports synchronous rectification to reduce body-diode losses.
For engineers reviewing the A3932SEQTR-T datasheet, A3932SEQTR-T pinout, A3932SEQTR-T application, or A3932SEQTR-T equivalent, key selection considerations include its 38-pin TSSOP package, -20°C to +85°C operating range ('S' suffix), lead-free 'T' variant, gate-drive timing (tr/tf ≤ 120 ns), dead-time programmability (100 ns–5.5 µs), and discontinuation status requiring transition planning.
Technical Context
The A3932SEQTR-T implements Hall-based 120° commutation logic with DIR-controlled rotation reversal and MODE-selectable fast/slow current decay. Its internal PWM current regulator uses an external RC network on the RC pin to set fixed off-time (10–50 µs) and blank time (≈0.91 µs typical), while peak current is set by VREF and sense resistor RS per Ipeak = VREF/RS.
High-side drive relies on bootstrapped CA/CB/CC supplies charged via internal 100 mA current sources, with monitoring circuitry ensuring gate voltage integrity before turn-on. Protection includes motor-lead short-to-ground detection (VDSH = 1.3–2.7 V), thermal shutdown at 165°C (10°C hysteresis), undervoltage lockout (9.2–10.2 V on VREG), and fault reporting via open-drain FAULT output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Motor Supply Voltage | Up to 50 V - enables use with industrial and automotive BLDC systems requiring robust voltage headroom. |
| Operating Temperature | -20°C to +85°C - validated for commercial and light-industrial ambient conditions without derating. |
| Gate Drive Rise/Fall Time | ≤120 ns / ≤60 ns - ensures fast switching of external N-MOSFETs while minimizing shoot-through risk when paired with programmable dead time. |
| Internal Reference Voltage | VLCAP = 4.75–5.25 V - provides stable 5 V bias for logic, pull-ups, and FAULT/TACH outputs; sourced from internal regulator. |
| Current Limit Accuracy | ±5 mV input offset - enables precise peak current setting (e.g., ±2% error at VREF = 1 V with RS = 0.01 Ω). |
| Thermal Shutdown Threshold | 165°C junction temperature - protects against latch-up or MOSFET failure during overload or poor heatsinking. |
| Bootstrap Charge Current | 100 mA - sustains high-side gate drive under 100% duty cycle operation with low-impedance external FETs. |
Pinout & Package
Package: 38-pin TSSOP (suffix LD), 9.7 mm × 4.4 mm body, 0.5 mm pitch, lead-free (100% matte tin plating), JEDEC MO-153 BD-1 compliant.
| 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 and high-side driver floating supplies. |
| GHA/GHB/GHC | High-side gate drivers | Drive gates of external N-channel high-side MOSFETs; output swing up to VBB + 17 V with 11.6 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 controlled di/dt via external gate resistors. |
| H1/H2/H3 | Hall sensor inputs | Accept 120°-spaced digital Hall signals; internally pulled up to VLCAP; illegal codes (000/111) trigger FAULT and coast. |
| REF/SENSE | Current limit interface | REF sets peak current threshold (Ipeak = VREF/RS); SENSE compares sensed voltage to REF during active PWM on-time. |
| DEAD | Dead time adjustment | Analog input tied to LCAP via resistor; sets non-overlap delay (100 ns–5.5 µs) between high/low-side turn-off and turn-on to prevent cross-conduction. |
| FAULT/TACH | Open-drain status outputs | FAULT asserts low on thermal shutdown, UVLO, Hall error, or short-to-ground; TACH pulses per Hall transition for speed feedback. |
| PWM/MODE/SR | Control logic inputs | PWM enables torque/speed control; MODE selects fast/slow decay; SR enables synchronous rectification to bypass body diodes. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Reduces conduction loss by actively switching low-side FETs during PWM off-cycle instead of relying on lossy body diodes. |
| Adjustable dead time | Programmable 100 ns–5.5 µs delay via external DEAD resistor prevents shoot-through in external power stage under varying MOSFET Ciss/Rg. |
| Integrated 5 V reference (VLCAP) | Stable 4.75–5.25 V supply powers internal logic, pull-ups, and FAULT/TACH outputs-eliminates need for external LDO in many designs. |
| Motor short-to-ground protection | Detects >2 V drain-source voltage on active high-side FETs and latches fault until next commutation-prevents destructive current flow. |
| Brake input (BRAKE) | Active-low signal forces all low-side FETs on and high-sides off, enabling dynamic braking by shorting BEMF across windings. |
| Thermal shutdown with hysteresis | Shuts down at 165°C and re-enables only below 155°C-avoids oscillation near trip point and allows safe recovery after transient overloads. |
Applications
| Industrial BLDC Pumps | Automotive HVAC Blowers |
|---|---|
Use Scenario: Constant-flow coolant circulation in industrial process equipment using 24–48 V BLDC pumps. IC Role / Device Role / Timing Role: Three-phase gate driver with Hall commutation, current limiting, and thermal protection for closed-loop motor control. Use Value: Enables reliable 50 V-rated operation with synchronous rectification reducing MOSFET heating by up to 30% versus diode-based decay. | Use Scenario: Variable-speed cabin air blower in 12 V automotive systems with EMI-sensitive analog sensors. IC Role / Device Role / Timing Role: Motor controller interfacing to Hall sensors and external N-MOSFET half-bridges; uses internal 5 V reference for clean logic biasing. Use Value: Integrated VREG and VLCAP eliminate external regulators; undervoltage lockout prevents erratic startup during battery dips. |
| Medical Ventilator Fans | Power Tool Motor Controllers |
Use Scenario: Precision airflow control in portable ventilators requiring quiet, low-vibration operation. IC Role / Device Role / Timing Role: Fixed off-time PWM current controller with adjustable blank time to suppress false trips from MOSFET reverse-recovery transients. Use Value: RC-timed blank window (0.91 µs typical) ensures accurate current sensing during high-dV/dt switching events. | Use Scenario: High-torque cordless drill motor drive with rapid direction reversal and dynamic braking. IC Role / Device Role / Timing Role: Direction (DIR), brake (BRAKE), and mode (MODE) controlled gate driver supporting bidirectional rotation and fast/slow decay selection. Use Value: BRAKE input enables immediate deceleration by shorting motor windings; DIR toggling reverses commutation sequence without firmware changes. |
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 thermal performance (RθJA = 42°C/W vs. 51°C/W), wider VBB range (up to 60 V), and improved fault diagnostics including overcurrent reporting. | Designed for new designs requiring longer product lifecycle support and higher voltage margin; not pin-compatible due to revised pinout and added features. | Select A3938SLDTR-T for new designs needing extended availability, higher voltage headroom, and richer diagnostic capability. |
| MP6532GQ-Z | Monolithic 3-phase gate driver (no integrated Hall logic); requires external MCU for commutation; supports 65 V VDD, 2 A peak gate drive, and adaptive dead time. | Used where microcontroller-based control is preferred over Hall-sensor autonomy; lacks integrated current regulation and Hall decoding. | Choose MP6532GQ-Z when system already includes a capable MCU and requires higher gate drive strength or adaptive dead-time tuning. |
Compared with A3932SEQTR-T, A3938SLDTR-T offers extended voltage rating, better thermal resistance, and ongoing production support, while MP6532GQ-Z shifts commutation intelligence to the host MCU and trades Hall autonomy for higher integration density and gate drive capability.
Availability
A3932SEQTR-T is available at Aetrix Electronics and suitable for industrial BLDC pump control, automotive HVAC blower systems, medical ventilator fans, and power tool motor controllers requiring stable component supply during legacy design support and obsolescence management.
Supply support for A3932SEQTR-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-sensitive, Hall-sensor-based three-phase BLDC motor control in industrial and automotive applications, emphasizing integrated protection, gate drive strength, and ease of layout with minimal external components.
FAQ
Is A3932SEQTR-T still in production?
No, A3932SEQTR-T 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 support, Aetrix Electronics maintains limited inventory with full traceability and documentation for A3932SEQTR-T.
What does the 'S' suffix in A3932SEQTR-T indicate?
The 'S' suffix in A3932SEQTR-T specifies an operating ambient temperature range of –20°C to +85°C. This is confirmed in the official Allegro datasheet and applies to the full A3932 family variant bearing the 'S' designation, including A3932SEQTR-T.
Can A3932SEQTR-T drive both high-side and low-side N-channel MOSFETs?
Yes, A3932SEQTR-T drives external N-channel MOSFETs on both high-side (via GHA/GHB/GHC with bootstrapped CA/CB/CC supplies) and low-side (via GLA/GLB/GLC referenced to PGND). Its architecture eliminates the need for P-channel high-side devices or external charge pumps beyond the integrated bootstrap circuitry.
How is current limiting implemented in A3932SEQTR-T?
A3932SEQTR-T uses internal fixed off-time PWM current control. Peak load current is set by the voltage applied to the REF pin and the external sense resistor value (Ipeak = VREF/RS). The SENSE pin feeds the comparator input, and the RC network sets the off-time duration-both parameters are fully user-configurable per the A3932SEQTR-T datasheet.
What is the function of the DEAD pin on A3932SEQTR-T?
The DEAD pin on A3932SEQTR-T is an analog input used to program the non-overlap dead time between high-side and low-side gate driver transitions. A resistor between DEAD and LCAP sets the delay (100 ns–5.5 µs) to prevent shoot-through in the external power stage-a critical safety feature explicitly defined in the A3932SEQTR-T electrical characteristics table.
A3932SEQTR-T 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-T FAQ
1.How can I place an order for A3932SEQTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A3932SEQTR-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 A3932SEQTR-T reliable?
The price and inventory of A3932SEQTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A3932SEQTR-T is usually 5 days.
3.What payment methods are accepted for A3932SEQTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A3932SEQTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A3932SEQTR-T?
A3932SEQTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A3932SEQTR-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 A3932SEQTR-T?
For technical support, including A3932SEQTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A3932SEQTR-T requirements.
6.How does Aetrix verify that A3932SEQTR-T is sourced from the original manufacturer or authorized distributors?
All A3932SEQTR-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 A3932SEQTR-T meets industry standards.
7.What is the process for return or replacement of A3932SEQTR-T?
All A3932SEQTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A3932SEQTR-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 A3932SEQTR-T part is unused and in its original packaging.
Return procedure for A3932SEQTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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