A3977SLPTR-T vs A4975SLBTR-T Comparison
Detailed side-by-side comparison of A3977SLPTR-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
A3977SLPTR-T - 35V/±2.5A Microstepping DMOS Driver | Allegro MicroSystems
A3977SLPTR-T ✓ ActiveAllegro MicroSystems
A4975SLBTR-T - ±1.5A Full-Bridge PWM Microstepping Driver | Allegro
A4975SLBTR-T ✓ ActiveSpecification Comparison
| Parameter | A3977SLPTR-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) | $3.65 | $2.95 |
| Motor Type | Bipolar stepper motor | Bipolar Stepper |
| Step Modes | Full, half, quarter, eighth | — |
| Output Configuration | Dual full H-bridge (2 outputs) | Full-Bridge (H-Bridge) |
| Load Voltage (Motor Supply) | 8 V to 35 V | — |
| Logic Supply Voltage | 3 V to 5.5 V | 4.5 V to 5.5 V |
| Output Current (per phase) | ±2.5 A | — |
| Maximum Output Voltage Rating | 35 V | — |
| rDS(on) - Source DMOS (typical) | 0.45 ohm | — |
| rDS(on) - Sink DMOS (typical) | 0.36 ohm | — |
| Current Control | Fixed off-time PWM with slow/fast/mixed decay | Internal PWM with selectable slow / fast / mixed decay |
| Synchronous Rectification | Yes (internal) | Internal (no external flyback diodes required) |
| Sleep Mode | Yes (low-power) | — |
| Automatic Decay Mode Selection | Yes | — |
| Operating Temperature | -20 C to +85 C | -20C to +85C [DATA_NEEDED: full industrial temperature range from datasheet] |
| Package | 28-pin TSSOP-EP (exposed pad) | 16-pin SOIC with exposed thermal pad (SLB) |
| Mounting Type | Surface Mount | Surface Mount |
| RoHS Status | Compliant | Compliant |
| Number of Outputs | — | 1 full-bridge (one phase winding) |
| Output Current (Continuous) | — | ±1.5 A |
| Load Supply Voltage | — | 5 V to 50 V |
| Microstepping Resolution | — | Full, Half, Quarter, Eighth step (via 3-bit nonlinear DAC) |
| DAC Resolution | — | 3-bit nonlinear (sinusoidal) |
| Thermal Protection | — | Internal thermal shutdown |
| Packaging | — | Tape & Reel (TR) |
| Output Transistor Technology | — | Power MOSFET / DMOS |