A4952ELYTR-T - 40V Full-Bridge DMOS PWM Motor Driver | Allegro
MPN: A4952ELYTR-T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.05 | $2.05 |
| 10 | $1.85 | $18.50 |
| 100 | $1.55 | $155.00 |
| 500 | $1.32 | $660.00 |
| 1,000 | $1.18 | $1,180.00 |
A4952ELYTR-T Overview
A full-bridge motor driver, also known as an H-bridge, is a four-switch power stage that allows bidirectional current flow through a DC motor winding. By controlling the diagonal pairs of switches, the motor can be driven forward, reverse, or dynamically braked. DMOS (double-diffused MOS) output transistors provide lower on-resistance and faster switching than equivalent bipolar drivers, improving efficiency and reducing thermal dissipation at the same current level. Full-bridge PWM motor drivers sit within the broader hierarchy of motor driver ICs -> power management ICs -> integrated circuits.
Key features include integrated overcurrent protection (OCP), motor short-to-ground protection, motor short-to-battery protection, motor lead short protection, low-power standby mode for battery conservation, and adjustable PWM current limiting through an external sense resistor. Synchronous rectification (active freewheeling) reduces power dissipation during the PWM off-time by keeping the low-side FET active rather than relying on the body diode, which directly improves efficiency at high PWM frequencies and high currents.
The A4952 and its companion A4953 share an identical datasheet and differ only in their current-limit trip level: the A4952 is set at ±2 A and the A4953 at ±1.5 A for designers who need a tighter thermal envelope. Internal logic prevents cross-conduction (shoot-through) by inserting dead time between high-side and low-side switch transitions on each half-bridge, a critical protection in PWM-driven H-bridge designs.
Typical applications include brushed DC motor control in consumer appliances, robotics actuators, solenoid and valve drivers, small HVAC damper actuators, battery-powered power tools, and two-fan or two-motor control boards in industrial equipment. Designers in 12 V and 24 V lead-acid or multi-cell Li-ion systems benefit from the 40 V absolute maximum rating and the wide operating voltage range.
When designing with the A4952ELYTR-T, ensure the exposed thermal pad is soldered to a sufficiently large copper pour to keep junction temperature within the datasheet's 150 °C absolute maximum. The PWM frequency should be selected between 1 kHz and 50 kHz to balance audible noise against switching losses; higher PWM frequencies demand stronger gate drive and may require RC snubbers on motor terminals to suppress voltage ringing.
This page synthesizes distributor pricing from DigiKey and Arrow, drop-in and functional alternatives, and design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for A4952ELYTR-T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
A4953ELYTR-T
✅ Drop-In📋 Reference alternative (not in catalog)
A4952ELYTR
✅ Drop-In📋 Reference alternative (not in catalog)
A4950ELYTR-T
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
A4953ELJTR-T
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
A4952ELYTR-T Maximum Ratings & Electrical Characteristics
| Motor Type | Brushed DC |
| Topology | Full-Bridge (H-Bridge) |
| Output Configuration | DMOS half-bridge pairs |
| Peak Output Current | ±2 A |
| Operating Supply Voltage | Up to 40 V |
| Current-Limit Trip | ±2 A (A4952) |
| Input Logic Levels | TTL/CMOS compatible |
| Control Inputs | Phase, Enable, PWM |
| Protection Features | OCP, motor short to ground, motor short to battery, motor lead short, thermal shutdown |
| Synchronous Rectification | Yes (active freewheeling) |
| Standby Mode | Yes (low-power) |
| Package | 10-MSOP-EP (MSOP with exposed thermal pad) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant (per PartGenie) |
A4952ELYTR-T Pin Configuration
| Pin 1 | OUT1 — H-bridge output A |
| Pin 2 | OUT2 — H-bridge output B |
| Pin 3 | GND — Ground |
| Pin 4 | IN1 — Logic input 1 (TTL/CMOS) |
| Pin 5 | IN2 — Logic input 2 (TTL/CMOS) |
| Pin 6 | ENABLE — Enable input (active high) |
| Pin 7 | PWM — PWM input for speed control |
| Pin 8 | LSS — Low-side source / current sense |
| Pin 9 | VBB — Motor supply (up to 40 V) |
| Pin 10 | VDD — Logic supply |
| Pin 11 | EP — Exposed thermal pad - must be soldered to GND copper pour |
Typical Applications
A4952ELYTR-T is suitable for 6 applications: Brushed DC Motor Control, Solenoid and Valve Drivers, Battery-Powered Power Tools, HVAC Damper and Valve Actuators, Robotics Actuators and Hobby Servos, Two-Fan or Two-Motor Control Boards.
Brushed DC Motor Control
The A4952ELYTR-T is purpose-built for brushed DC motor control in bidirectional applications such as robotics actuators, small appliances, and battery-powered tools. Its ±2 A peak current and 40 V supply envelope comfortably cover most 12 V and 24 V DC motors up to 25 W continuous. The integrated DMOS H-bridge plus synchronous rectification delivers higher efficiency than bipolar alternatives at the same current, reducing heatsink mass. TTL/CMOS-compatible logic inputs allow direct connection to microcontrollers without level shifters. Integrated OCP, short-to-ground, short-to-battery, and lead-short protection eliminate external fusing in most designs, shrinking BOM count.
Recommended
Solenoid and Valve Drivers
Industrial solenoid and proportional valve actuators benefit from the A4952ELYTR-T's full-bridge topology and ±2 A peak drive. Driving a solenoid bidirectionally from a single H-bridge enables active push-pull actuation instead of return-spring designs, improving response time and reducing mechanical wear. The synchronous rectification reduces thermal dissipation during PWM hold-current regulation. With overcurrent and short-circuit protection integrated, the part is suited to 24 V industrial loop-powered applications.
Recommended
Battery-Powered Power Tools
Cordless drills, screwdrivers, and garden tools in the 12 V-36 V Li-ion class can use the A4952ELYTR-T as a brushed motor controller. The 40 V absolute maximum easily survives 10S Li-ion packs (up to 42 V fully charged) with adequate derating. Active braking with synchronous rectification stops the motor quickly when the trigger is released, an important safety and ergonomic feature in power tools. Low-power standby mode extends battery shelf life when the tool is idle, and integrated protection eliminates an external fuse.
Recommended
HVAC Damper and Valve Actuators
Building automation HVAC damper and valve actuators use small brushed DC gearmotors that benefit from the A4952ELYTR-T's compact 10-MSOP-EP footprint and silent PWM operation. With proper gate drive above the audible range (20-25 kHz), switching noise is inaudible in occupied spaces, satisfying residential and hospitality acoustic requirements. Integrated protection allows the actuator to survive stalled-motor and wiring-fault conditions common during installation and commissioning. Allegro's reputation for reliability supports long-life (10+ year) HVAC deployments.
Recommended
Robotics Actuators and Hobby Servos
Hobby and educational robotics frequently integrate the A4952ELYTR-T as a brushed DC motor driver for small wheels, pan-tilt units, and gripper actuators. The simple TTL logic interface connects directly to Arduino, Raspberry Pi, or Microchip PIC platforms (e.g., PIC32MX340F512H-80I/MR, PIC18F4685T-I/PT) without level translation. Active braking enables position hold, while the small MSOP package fits inside compact robot chassis. The exposed thermal pad efficiently dissipates heat into the PCB copper, suiting continuous-duty motor control.
Recommended
Two-Fan or Two-Motor Control Boards
Industrial control boards driving two fans, pumps, or small brushed motors often use two A4952ELYTR-T devices - one per channel - to provide independent speed and direction control. The 10-MSOP-EP package keeps board area small, and the integrated protection per channel limits fault propagation. With TTL logic inputs, each bridge can be commanded by a single microcontroller PWM output. Synchronous rectification and low RDS(on) DMOS keep efficiency high enough to avoid active cooling in most 1-2 A continuous applications.
Recommended
Recommended Products Summary
Engineering reference data for A4952ELYTR-T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | A4953ELYTR-T | A4952ELYTR | A4950ELYTR-T | A4953ELJTR-T |
|---|---|---|---|---|---|
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Package | 10-MSOP-EP | 10-MSOP-EP - same | 10-MSOP-EP - same | 10-MSOP-EP - same | 10-MSOP-EP - same |
| Motor Type | Brushed DC (full-bridge) | Brushed DC (full-bridge) | Brushed DC (full-bridge) | Brushed DC (full-bridge) | Brushed DC (full-bridge) |
| Operating Voltage | Up to 40 V | Up to 40 V | Up to 40 V | Up to 40 V | Up to 40 V |
| Current Limit Trip | ±2 A | ±1.5 A (-25%) | ±2 A | Lower (Allegro A4950 family rating) | ±1.5 A (-25%) |
| Output Stage Technology | DMOS (low RDS(on)) | DMOS | DMOS | DMOS | DMOS |
| Synchronous Rectification | Yes | Yes | Yes | Yes | Yes |
| Standby Mode | Yes (low-power) | Yes | Yes | Yes | Yes |
| Packaging Form | Tape & Reel (-T) | Tape & Reel | Tray (no -T suffix) | Tape & Reel | Tape & Reel (JEDEC reel) |
| RoHS Compliance | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Key Differentiators
- Synchronous rectification reduces dissipation during PWM off-time (vs A4953ELYTR-T)
- 40 V absolute maximum covers 10S Li-ion and 24 V industrial bus (vs A4950ELYTR-T)
- Integrated protection reduces BOM cost (vs A4952ELYTR)
- Compact 10-MSOP-EP with exposed thermal pad (vs A4953ELJTR-T)
Design Notes
Estimated: at VBB = 24 V, OUT = 12 V, I = 2 A continuous into a brushed DC motor, the H-bridge dissipates (24-12)*2 = 24 W. The 10-MSOP-EP exposed-pad package requires at least 1 square inch of 2 oz copper on each internal plane tied to the EP pin, with thermal vias to the bottom layer, to keep junction temperature below 150 °C. Without sufficient copper, the EP will desolder or trip thermal shutdown at high duty cycle. Designers should size copper empirically with a thermocouple on the EP during worst-case testing.
Place the VM bulk capacitor (10 µF or larger low-ESR ceramic + 100 µF electrolytic) within 5 mm of the VBB pin to suppress inductive ringing and supply droop during PWM transitions. Place the LSS sense resistor (if used) directly at the LSS pin with short, wide traces. Keep logic input traces (IN1, IN2, ENABLE, PWM) away from the OUT1/OUT2 switching nodes to avoid capacitive coupling that can cause spurious commands during high dv/dt transitions. A ground pour under the EP provides both thermal relief and a low-impedance return for switching currents.
Three common pitfalls: (1) Forgetting to solder the exposed thermal pad - this leads to thermal shutdown within seconds of full-load operation. (2) Exceeding the absolute maximum VBB of 40 V during load-dump transients in 24 V industrial systems - add a TVS clamp or input protection. (3) Driving the motor leads while they are disconnected from the motor - the inductive kick can exceed VBB and damage the output FETs; ensure motor leads are connected before applying power, or add external flyback protection.
Long motor leads (longer than ~300 mm) introduce significant inductance and can cause VBB overshoot during PWM turn-off even with synchronous rectification. Add a 100 nF ceramic + 10 µF electrolytic bulk cap across VBB-GND as close as possible to the bridge, and consider a 1-10 Ω gate resistor on the OUT lines if ringing exceeds 5 V/ns. In noisy environments, add an RC low-pass filter (10 kΩ + 1 nF) on each logic input to prevent EMI-induced false triggering.
Compliance Information
RoHS3 compliant per PartGenie compliance metadata; REACH status reported by PartGenie as not separately qualified; lead-free packaging. Not AEC-Q100 qualified - this is an industrial/consumer part. Halogen-free and conflict-minerals compliance inherited from Allegro's broader program.
