A3967SLBTR-T - 30V/±750mA Microstepping Stepper Driver | Allegro
Référence : A3967SLBTR-T ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.68 | $4,68 |
| 10 | $4.21 | $42,10 |
| 100 | $3.74 | $374,00 |
| 500 | $3.27 | $1 635,00 |
| 1 000 | $2.85 | $2 850,00 |
| 3 000 | $2.4 | $7 200,00 |
A3967SLBTR-T Présentation
A microstepping driver with translator is a dedicated mixed-signal IC that converts step and direction pulses into phase-current waveforms that approximate sine-cosine commutation. Within the broader motor-driver hierarchy, the A3967 sits between simple full-/half-step controllers and more advanced closed-loop microstepping DSP controllers; it is a member of the bipolar stepper driver family within the larger power management and motion control IC category. Built-in translator logic and adaptive current decay are key differentiators versus raw H-bridge drivers.
Key features include a Satlington® synchronous-rectified sink driver topology, automatic current-decay mode detection and selection (mixed, fast, slow), internal PWM current control with fixed off-time regulation, and ±750 mA continuous per-phase output. The 24-SOIC package provides a thermal resistance suitable for surface-mount designs at moderate power levels and exposes the logic supply, motor supply, phase outputs, and decay-mode configuration pins on a standard JEDEC-compliant land.
The A3967 architecture combines a CMOS translator state machine, dual H-bridge DMOS output stages, and a fixed off-time current regulator. The translator accepts STEP and DIR inputs and sequentially energizes the phase coils in microstep increments, while the internal DAC generates sinusoidal reference levels. Automatic current-decay mode selection reduces ripple by choosing slow, fast, or mixed decay based on operating conditions, which minimizes audible motor noise and torque ripple.
Typical applications include 3D printer axis drives, CNC mill stepper axes, camera pan-tilt mechanisms, textile mill automation, and office automation equipment such as paper-handling in printers and scanners. The wide 4.75 V to 30 V motor supply range accommodates both 12 V and 24 V bus systems commonly used in industrial motion control.
When designing with the A3967, ensure that the logic supply (VCC) is decoupled with a 0.1 µF ceramic placed within 5 mm of the VCC pin, and add a bulk capacitor of at least 47 µF on the motor supply (VM). The ROSENSE resistor should be selected to set the peak phase current using the datasheet formula ITRIP = VREF / (8 × RSENSE), and unused logic inputs must not be left floating.
Alternatives de remplacement direct pour A3967SLBTR-T — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
A3967SLBTR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
A3967SLB-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
A3967SLB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
A3967SLBTR-T Valeurs maximales et caractéristiques électriques
| Motor Type | Bipolar Stepper |
| Fonction | Driver - Fully Integrated (Control and Power Stage) |
| Nombre de sorties | 4 (dual H-bridge) |
| Configuration de sortie | Half-Bridge (dual H-bridge for 2-phase bipolar) |
| Logic Supply Voltage (VCC) | 3 V to 5.5 V |
| Motor Supply Voltage (VM) | 4.75 V to 30 V |
| Output Current (per phase, continuous) | ±750 mA |
| Output Voltage Rating | 30 V |
| Step Resolution | Full, Half, Quarter, Eighth step |
| Current-Decay Modes | Automatic selection: slow, fast, mixed |
| Current Regulation | Fixed off-time PWM |
| Output Stage | Satlington® synchronous-rectified sink drivers |
| Température de fonctionnement | -20 °C to +85 °C |
| Type de montage | Surface Mount |
| Boîtier | 24-SOIC (0.295", 7.50 mm width) |
| Statut RoHS | Compliant (per distributor listings) |
Configuration des broches de A3967SLBTR-T
| Broche 1 | STEP — Step input - rising edge advances the translator one microstep |
| Broche 2 | DIR — Direction input - logic level sets motor rotation direction |
| Broche 3 | MS1 — Microstep select 1 - sets step resolution with MS2 |
| Broche 4 | MS2 — Microstep select 2 - sets step resolution with MS1 |
| Broche 5 | REF — Reference voltage input - sets ITRIP via VREF/(8*RSENSE) |
| Broche 6 | GND — Logic ground |
| Broche 7 | ROSENSE — Current sense resistor connection (phase A) |
| Broche 8 | SENSE_A — Phase A current sense return |
| Broche 9 | OUT1A — H-bridge output 1A (phase A+) |
| Broche 10 | OUT1B — H-bridge output 1B (phase A-) |
| Broche 11 | VCC — Logic supply (3 V to 5.5 V) |
| Broche 12 | VBB — Motor supply (4.75 V to 30 V) |
| Broche 13 | OUT2A — H-bridge output 2A (phase B+) |
| Broche 14 | OUT2B — H-bridge output 2B (phase B-) |
| Broche 15 | SENSE_B — Phase B current sense return |
| Broche 16 | NC — Not connected (per datasheet) |
| Broche 17 | NC — Not connected (per datasheet) |
| Broche 18 | NC — Not connected (per datasheet) |
| Broche 19 | NC — Not connected (per datasheet) |
| Broche 20 | NC — Not connected (per datasheet) |
| Broche 21 | ENABLE — Logic enable - logic low disables outputs |
| Broche 22 | RC1 — Fixed off-time resistor/capacitor |
| Broche 23 | RC2 — Fixed off-time resistor/capacitor |
| Broche 24 | GND — Power ground |
Applications typiques
A3967SLBTR-T convient pour 6 applications: 3D Printer Axis Stepper Drive, CNC Mill Stepper Axis Driver, Camera Pan-Tilt and Robotics Actuator, Textile and Sewing Machine Automation, Office Automation: Paper and Document Handling, Lab Automation and Pipetting Robots.
3D Printer Axis Stepper Drive
Drives X/Y/Z axis bipolar stepper motors on Cartesian and CoreXY 3D printers using the A3967SLBTR-T's built-in translator and eighth-step microstepping. The ±750 mA per-phase output easily supports NEMA 17 motors up to 1.7 A peak when paired with appropriate RSENSE values, and the 4.75 V to 30 V motor supply range accepts 12 V and 24 V printer PSU rails. With STEP and DIR inputs driven directly from the printer MCU, no external indexer or current DAC is required, reducing BOM cost. Eighth-step resolution (1600 steps/rev on a 200-step motor) produces smooth layer transitions and eliminates audible resonance in the 100-300 Hz band.
Recommandé
CNC Mill Stepper Axis Driver
Drives bipolar stepper motors on small-format CNC mills and routers using the A3967SLBTR-T's 30 V/±750 mA H-bridge outputs and automatic current-decay mode selection. The 30 V motor supply rating accommodates 24 V industrial bus rails, providing higher torque per phase than 12 V-only alternatives. The fixed off-time PWM current regulator maintains ITRIP set by an external RSENSE, and mixed-decay operation reduces audible motor whine at low RPM — important for benchtop CNC environments. Two A3967s can drive a 3-axis mill (X/Y/Z) or four A3967s can drive a 4-axis router with a single MCU.
Recommandé
Camera Pan-Tilt and Robotics Actuator
Drives bipolar stepper actuators in pan-tilt camera mounts, security camera positioning systems, and small robotics joints where smooth low-speed motion is required. The A3967SLBTR-T's eighth-step microstepping produces 1600 positions per motor revolution, eliminating the jerky motion that would be visible in surveillance footage or robotic arm trajectories. The wide 3 V to 5.5 V logic range allows direct connection to 3.3 V MCUs such as the PIC32 or STM32 families without level translators. Satlington® synchronous sink drivers reduce power dissipation versus standard H-bridge drivers, an important factor in battery-powered robotics.
Recommandé
Textile and Sewing Machine Automation
Drives bipolar stepper motors that index fabric, control thread tension, and position needle bars in industrial textile machinery. The A3967SLBTR-T's automatic current-decay selection (slow/fast/mixed) is well suited to the variable load profile of textile machinery, where motor current demand changes rapidly as fabric tension varies. The -20 °C to +85 °C operating range covers typical textile-mill ambient conditions, and the 24-SOIC surface-mount package withstands the vibration of mill equipment when properly PCB-mounted. Up to four A3967s can control four independent axes from a single textile-controller board.
Recommandé
Office Automation: Paper and Document Handling
Drives bipolar stepper motors that feed paper, position print heads, and actuate sorters in printers, scanners, copiers, and document sorters. The A3967SLBTR-T's translator interface accepts STEP/DIR pulses from the printer formatter ASIC or MCU, eliminating the need for a dedicated indexer chip and reducing BOM count. Eighth-step microstepping produces quiet paper-feed motion that meets office noise requirements, and the Satlington® synchronous-rectified sink drivers minimize thermal dissipation inside the enclosed printer chassis. The 24-SOIC package is JEDEC-standard for SMT assembly lines used in office-equipment manufacturing.
Recommandé
Lab Automation and Pipetting Robots
Drives bipolar stepper actuators in laboratory automation equipment such as pipetting robots, plate handlers, and analytical instrument sample stages. The A3967SLBTR-T's eighth-step resolution provides the precise positioning required for sub-millilitre pipetting accuracy, and the automatic decay-mode selection produces the smooth motion profile essential for vibration-sensitive analytical measurements. The 3 V to 5.5 V logic supply allows direct interfacing with low-voltage lab MCUs. Two A3967s can drive a 2-axis pipetting arm; four A3967s support a 4-axis plate handler with a single control MCU.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour A3967SLBTR-T — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | A3967SLBTR | A3967SLB-T | A3967SLB |
|---|---|---|---|---|
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Package | 24-SOIC | 24-SOIC - same | 24-SOIC - same | 24-SOIC - same |
| Output Current (per phase) | ±750 mA | ±750 mA | ±750 mA | ±750 mA |
| Motor Supply Voltage | 4.75 V to 30 V | 4.75 V to 30 V | 4.75 V to 30 V | 4.75 V to 30 V |
| Logic Supply Voltage | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V |
| Step Resolution | Full/Half/Quarter/Eighth | Full/Half/Quarter/Eighth | Full/Half/Quarter/Eighth | Full/Half/Quarter/Eighth |
| Current-Decay Mode | Automatic (slow/fast/mixed) | Automatic (slow/fast/mixed) | Automatic (slow/fast/mixed) | Automatic (slow/fast/mixed) |
| Operating Temperature | -20 °C to +85 °C | -20 °C to +85 °C | -20 °C to +85 °C | -20 °C to +85 °C |
| Packaging Media | Tape & Reel | Tube | Tube | Tube (obsolete) |
| Lifecycle Status | Active | Active | Active | Obsolete |
Principaux différenciateurs
- Only A3967 family variant shipped in Tape & Reel with full distributor stock (vs A3967SLBTR (Tube))
- Active production status with current datasheet (vs A3967SLB (obsolete))
- Integrated translator eliminates external microstepping DAC/indexer IC (vs Raw Allegro H-bridge drivers (e.g., A2916 without translator))
Notes de conception
Decouple VCC (logic supply, pin 11) with a 0.1 µF X7R ceramic placed within 5 mm of the pin, plus a 10 µF tantalum or ceramic bulk capacitor. Decouple VBB (motor supply, pin 12) with a 47 µF or larger electrolytic plus a 1 µF ceramic. Estimated: at VM=24 V and 750 mA peak per phase, the VBB bulk capacitor must absorb 24 V × 0.75 A = 18 W of switching transient energy per PWM cycle, and undersized bulk capacitance causes motor supply ripple that couples back to logic supply.
The 24-SOIC package has a thermal resistance of approximately 60 °C/W (theta_JA, per typical Allegro SOIC datasheets). Estimated: at VM=12 V, VCC=5 V, and continuous ±750 mA per-phase output at eighth-step mode, total package dissipation can reach 1.5-2.5 W; copper-pour PCB thermal management (at least 1 square inch of 2-oz copper on the GND pin thermal path) is required to keep junction temperature below 125 °C. Derate output current above 50 °C ambient.
Place RSENSE as a low-inductance surface-mount resistor (preferably 2512 or 2010 size) directly at the SENSE_A/SENSE_B pins, with the high-current return trace wide and short to minimize ground bounce. The RC1/RC2 fixed off-time timing components must be within 5 mm of their pins. Keep motor output traces (OUT1A/1B/2A/2B) physically separated from STEP/DIR logic traces by at least 3 mm to avoid dV/dt coupling. Use a single-point ground star at the GND pin.
Do not leave STEP, DIR, MS1, MS2, or ENABLE floating - tie them to defined logic levels (typically through 10 kΩ pull-up to VCC for active-high signals). Do not exceed VM=30 V absolute maximum; transients above 30 V can be caused by motor back-EMF when decelerating - add a 30 V TVS diode across the motor supply. The REF input voltage must not exceed VCC. When changing decay modes via hardware, allow at least 100 µs for the mode decision to settle before the next STEP pulse.
Informations de conformité
RoHS and lead-free compliance per Allegro product documentation and DigiKey/Mouser distributor listings. REACH compliance per Allegro environmental statements. AEC-Q100 not applicable - this is a motor driver IC for industrial/consumer use, not automotive-grade. Halogen-free status not explicitly listed in distributor data; refer to Allegro for confirmation. Conflict-minerals statement available on Allegro corporate responsibility page.
