A3938SLDTR-T vs A4975SLBTR-T Comparison
Detailed side-by-side comparison of A3938SLDTR-T by Allegro MicroSystems and A4975SLBTR-T by Allegro MicroSystems. Compare key specifications, electrical parameters, packaging, lifecycle status, pricing, and availability to determine the best component for your design requirements.
Allegro MicroSystems
A3938SLDTR-T - 3-Phase BLDC MOSFET Controller, 50V | Allegro
A3938SLDTR-T ✓ ActiveAllegro MicroSystems
A4975SLBTR-T - ±1.5A Full-Bridge PWM Microstepping Driver | Allegro
A4975SLBTR-T ✓ ActiveSpecification Comparison
| Parameter | A3938SLDTR-T | A4975SLBTR-T |
|---|---|---|
| Brand | Allegro MicroSystems | Allegro MicroSystems |
| Category | Motor Drivers | Motor Drivers |
| Lifecycle Status | Active | Active |
| Stock Status | In Stock | In Stock |
| Unit Price (USD) | $4.05 | $2.95 |
| Function | Three-phase BLDC motor controller / MOSFET gate driver | — |
| Motor Supply Voltage | 18 V to 50 V | — |
| Topology | Three-phase, 6-step PWM / synchronous rectification | — |
| Number of Outputs | 3 half-bridge gate drive channels | 1 full-bridge (one phase winding) |
| Output Configuration | Pre-driver for N-channel MOSFETs (high-side + low-side) | Full-Bridge (H-Bridge) |
| High-Side Drive | Bootstrap with internal bootstrap diode | — |
| Synchronous Rectification | Yes (low-side) | Internal (no external flyback diodes required) |
| Dead Time Adjustment | Adjustable (external resistor) | — |
| MOSFET Protection | Cross-conduction / shoot-through protection | — |
| PWM Input | Logic-level compatible | — |
| Package | 38-pin TSSOP (LD) | 16-pin SOIC with exposed thermal pad (SLB) |
| Mounting Type | Surface Mount | Surface Mount |
| Packaging | Tape & Reel (TR) | Tape & Reel (TR) |
| Operating Temperature | -20C to +85C (industrial range per datasheet) | -20C to +85C [DATA_NEEDED: full industrial temperature range from datasheet] |
| RoHS Status | Compliant (per Alldatasheet listing) | Compliant |
| Motor Type | — | Bipolar Stepper |
| Output Current (Continuous) | — | ±1.5 A |
| Load Supply Voltage | — | 5 V to 50 V |
| Logic Supply Voltage | — | 4.5 V to 5.5 V |
| Microstepping Resolution | — | Full, Half, Quarter, Eighth step (via 3-bit nonlinear DAC) |
| Current Control | — | Internal PWM with selectable slow / fast / mixed decay |
| DAC Resolution | — | 3-bit nonlinear (sinusoidal) |
| Thermal Protection | — | Internal thermal shutdown |
| Output Transistor Technology | — | Power MOSFET / DMOS |