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