A4989SLDTR-T - Dual Full-Bridge MOSFET Driver | Allegro MicroSystems
Référence : A4989SLDTR-T ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.36 | $336,00 |
| 500 | $2.98 | $1 490,00 |
| 1 000 | $2.65 | $2 650,00 |
A4989SLDTR-T Présentation
A motor driver IC is an integrated circuit that translates low-power logic signals into the high-current, high-voltage phase waveforms required to commutate stepper motors, brushless DC motors, or brushed DC motors. Within the power management and motion control hierarchy, gate drivers like the A4989 sit between a low-voltage microcontroller (logic side) and external power MOSFETs (power side), combining logic-level translation with high-current gate drive and adaptive dead-time insertion. Allegro's broader Allegro MicroSystems portfolio spans Hall-effect sensors, brushless DC drivers, and stepper drivers optimized for industrial automation, robotics, and 3D-printer-style motion stages.
Key features of the A4989SLDTR-T include programmable mixed-decay timing, synchronous rectification for low dissipation, internal UVLO and thermal shutdown, a programmable blanking time, and an industry-standard 2-wire step-and-direction interface. The driver supports microstep resolutions up to 1/16 step and is suitable for industrial bipolar stepper motors in the 30 W to 500 W range where external MOSFETs allow scaling to higher current than an integrated-FET part can deliver.
Technically, the A4989 uses an internal charge-pump-driven gate drive to deliver the high-side gate boost voltage needed for 100% duty-cycle PWM operation at 50 V motor supply. The mixed-decay mode combines slow and fast decay dynamically to reduce ripple current at low step rates, while synchronous rectification reduces body-diode losses during PWM off-time. The integrated translator is cascadable via DIR and STEP pins, enabling multi-axis stepper systems with synchronized motion.
Typical applications include industrial stepper motor drives, CNC routers, 3D printers, textile machinery, labeling equipment, and automated factory motion stages. The wide 12 V to 50 V motor supply range lets one design platform cover 24 V bus systems as well as higher-voltage industrial rails. When designing with the A4989, select external N-channel MOSFETs with appropriate VDS rating (>= 60 V recommended for headroom), R_DS(on), and gate charge to balance efficiency and thermal performance.
A common trade-off is that the A4989 requires more design effort than fully-integrated drivers like the A4988 or DRV8825 because the external MOSFET selection directly affects efficiency, thermal behavior, and EMI. For designs needing the lowest BOM count and fastest time-to-market in the sub-2 A range, an integrated-FET driver may be a better fit.
This page synthesizes distributor pricing, drop-in package alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour A4989SLDTR-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 :
A4989SLDTR-T-1
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
A4989SLD
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
A4989SLDTR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
A4989SLDTR-T Valeurs maximales et caractéristiques électriques
| Motor Type | Bipolar stepper, 2-phase |
| Nombre de sorties | 2 (dual full-bridge gate drivers) |
| Topologie | Dual full-bridge with external N-channel MOSFETs |
| Logic Supply Voltage (VCC) | 3 V to 5.5 V |
| Motor Supply Voltage (VM) | 12 V to 50 V |
| Output Current | External-MOSFET dependent (suitable for 30 W to 500 W motors) |
| Microstep Resolution | Full step to 1/16 step (programmable) |
| Control Interface | Step and Direction (2-wire) with MS1/MS2 resolution select |
| Decay Modes | Mixed (slow + fast), programmable |
| Redressement synchrone | Yes |
| Internal Charge Pump | Yes (for high-side gate boost) |
| UVLO (Logic) | Yes (internal) |
| Arrêt thermique | Yes (internal) |
| Température de fonctionnement | -20 C to +85 C |
| Boîtier | 38-pin TSSOP (SLD) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
Configuration des broches de A4989SLDTR-T
| Broche 1 | VCC — Logic supply (3 V to 5.5 V) |
| Broche 2 | GND — Logic ground |
| Broche 3 | RESET — Logic input, active-low reset |
| Broche 4 | STEP — Step pulse input (rising edge advances motor) |
| Broche 5 | DIR — Direction logic input |
| Broche 6 | MS1 — Microstep resolution select bit 1 |
| Broche 7 | MS2 — Microstep resolution select bit 2 |
| Broche 8 | SLEEP — Sleep mode logic input |
| Broche 9 | VDD — Internal regulator bypass |
| Broche 10 | ROSC — Oscillator resistor for blanking time |
| Broche 11 | DECAY — Decay mode select / mixed-decay timing |
| Broche 12 | BLANK — Blanking time programming |
| Broche 13 | — Reference voltage for current setpoint |
| Broche 14 | SENSE1 — Bridge 1 current sense resistor input |
| Broche 15 | SENSE2 — Bridge 2 current sense resistor input |
| Broche 16 | OUT1A — Gate drive output - bridge 1, high-side or low-side A |
| Broche 17 | OUT1B — Gate drive output - bridge 1, high-side or low-side B |
| Broche 18 | OUT2A — Gate drive output - bridge 2, high-side or low-side A |
| Broche 19 | OUT2B — Gate drive output - bridge 2, high-side or low-side B |
| Broche 20 | CP1 — Charge pump capacitor 1 |
| Broche 21 | CP2 — Charge pump capacitor 2 |
| Broche 22 | VCP — Charge pump output (high-side gate boost) |
| Broche 23 | VM — Motor supply (12 V to 50 V) |
| Broche 24 | PGND — Power ground |
| Broche 25 | NC — Not connected (per datasheet) |
| Broche 26 | NC — Not connected (per datasheet) |
| Broche 27 | NC — Not connected (per datasheet) |
| Broche 28 | NC — Not connected (per datasheet) |
| Broche 29 | NC — Not connected (per datasheet) |
| Broche 30 | NC — Not connected (per datasheet) |
| Broche 31 | NC — Not connected (per datasheet) |
| Broche 32 | NC — Not connected (per datasheet) |
| Broche 33 | NC — Not connected (per datasheet) |
| Broche 34 | NC — Not connected (per datasheet) |
| Broche 35 | NC — Not connected (per datasheet) |
| Broche 36 | NC — Not connected (per datasheet) |
| Broche 37 | NC — Not connected (per datasheet) |
| Broche 38 | NC — Not connected (per datasheet) |
Applications typiques
A4989SLDTR-T convient pour 6 applications: Industrial Stepper Motor Drive, CNC Router and Milling Machine, 3D Printer Motion Control, Textile and Labeling Machinery, Automated Factory Motion Stage, Laboratory Automation and Pump Drives.
Industrial Stepper Motor Drive
The A4989SLDTR-T is purpose-built for industrial bipolar stepper motor drives in the 30 W to 500 W range, where its dual full-bridge gate drive topology and integrated microstepping translator eliminate the need for a dedicated motion controller. Operating from 12 V to 50 V motor supply with external N-channel MOSFETs, the part scales easily from small NEMA 23 frames to large NEMA 34 industrial axes. The 2-wire step-and-direction interface plugs directly into a PLC, microcontroller, or motion controller, and microstepping up to 1/16 step gives smooth low-speed torque and accurate positioning. Designers typically place the A4989 on the same PCB as its four external MOSFETs, sense resistors, and a small microcontroller, producing a compact 2-Axis or 1-Axis industrial stepper driver module.
Recommandé
CNC Router and Milling Machine
CNC routers and small CNC milling machines use bipolar stepper motors in the 100 W to 400 W range to drive X, Y, and Z axes, and the A4989SLDTR-T is well matched to that power envelope. Its 12 V to 50 V motor supply lets one design support both 24 V benchtop CNC machines and higher-voltage industrial CNC platforms, while the integrated 1/16-step microstepping translator delivers the smooth motion required for high-quality surface finishes. Mixed-decay mode reduces audible motor noise and ripple current at low feed rates, improving cut quality. The external N-channel MOSFETs allow designers to tune current per axis by simply swapping MOSFETs or sense resistors, without changing the gate driver IC.
Recommandé
3D Printer Motion Control
3D printers typically use NEMA 17 bipolar stepper motors in the 30 W to 70 W range, and the A4989SLDTR-T can drive these with appropriate low-R_DS(on) external MOSFETs. Although many 3D-printer designs use the simpler integrated A4988 or DRV8825 drivers, designs that need higher torque or that want to upgrade existing 24 V systems to higher-voltage supplies benefit from the A4989's 50 V ceiling. The integrated step/direction translator accepts commands directly from a 3D-printer controller board running Marlin, Klipper, or RepRapFirmware, simplifying firmware. Synchronous rectification reduces MOSFET body-diode losses during high-frequency PWM at high step rates.
Recommandé
Textile and Labeling Machinery
Textile machinery, labeling machines, and packaging lines use bipolar stepper motors for precise web-feed and indexing motion, and the A4989SLDTR-T supports these with its 1/16-step microstepping and wide motor supply range. The integrated translator offloads microstep waveform generation from the host PLC, freeing CPU cycles for higher-level machine control. Mixed-decay mode keeps motor current ripple low at the slow speeds typical of web-feeding applications, reducing vibration and improving print or label placement accuracy. The 3 V to 5.5 V logic supply is directly compatible with 3.3 V and 5 V microcontrollers and PLCs commonly used in factory automation.
Recommandé
Automated Factory Motion Stage
Pick-and-place machines, automated assembly stations, and linear motion stages use bipolar stepper motors for repeatable positioning, where the A4989SLDTR-T's integrated microstepping translator simplifies the firmware and PCB. The 12 V to 50 V motor supply range lets one design cover 24 V factory bus systems and 48 V industrial motion systems. Multiple A4989 ICs can share a common STEP/DIR bus from the motion controller to synchronize multi-axis motion. The internal UVLO and thermal shutdown protect the driver and external MOSFETs from fault conditions common in factory environments.
Recommandé
Laboratory Automation and Pump Drives
Laboratory automation equipment such as syringe pumps, peristaltic pumps, and analytical instrument stages uses bipolar stepper motors for precise fluid and sample handling, where the A4989SLDTR-T provides the precise low-speed positioning needed. The integrated 1/16-step microstepping delivers smooth low-velocity motion that prevents fluid slosh and improves dispensing accuracy. Synchronous rectification reduces thermal dissipation on densely-packed lab-instrument PCBs. The 38-pin TSSOP package is compact enough to fit alongside other analog front-end and sensor signal-conditioning circuitry typical of analytical instruments.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour A4989SLDTR-T — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | A4989SLDTR-T-1 | A4989SLD | A4989SLDTR |
|---|---|---|---|---|
| Package | 38-pin TSSOP (SLD) | 38-pin TSSOP (SLD) - same | 38-pin TSSOP (SLD) - same | 38-pin TSSOP (SLD) - same |
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Motor Type | Bipolar stepper, 2-phase | Bipolar stepper, 2-phase | Bipolar stepper, 2-phase | Bipolar stepper, 2-phase |
| Logic Supply (VCC) | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V |
| Motor Supply (VM) | 12 V to 50 V | 12 V to 50 V | 12 V to 50 V | 12 V to 50 V |
| Microstep Resolution | Full to 1/16 step | Full to 1/16 step | Full to 1/16 step | Full to 1/16 step |
| External MOSFETs Required | Yes (N-channel) | Yes (N-channel) | Yes (N-channel) | Yes (N-channel) |
| Operating Temperature | -20 C to +85 C | -20 C to +85 C | -20 C to +85 C | -20 C to +85 C |
Principaux différenciateurs
- External N-channel MOSFETs for scalable current (vs A4988 (integrated FETs, 2 A max))
- Wide motor supply up to 50 V (vs A4988 (up to 35 V VM))
- Integrated microstepping translator (vs TI DRV8711 (external indexer required))
Notes de conception
Estimated: at a motor supply of 24 V and average phase current of 3 A through external MOSFETs with R_DS(on) of 10 milliohm, conduction loss per MOSFET is approximately 90 mW and total dissipation per H-bridge is around 360 mW. With the A4989 IC itself dissipating roughly 0.5 W of internal logic and gate-drive loss, total board dissipation approaches 2.5 W. Use at least 2 square inches of copper pour on the PGND net, and provide adequate thermal vias under the MOSFET pads to keep junction temperature within the 150 C rating.
Place the sense resistors as close as possible to the SENSE1/SENSE2 pins with Kelvin connection to the IC, and keep the high-current motor traces away from the analog VREF and logic pins to avoid noise coupling. The charge-pump capacitors on CP1/CP2 must be placed near the IC with short traces to the VM and VCP pins. Decouple VCC and VM with both a 100 nF ceramic and a 10 uF bulk capacitor placed within 5 mm of the supply pins. Per the Allegro datasheet layout guidelines, separate the power ground (PGND) and logic ground (GND) and connect them at a single point near the IC.
Do not exceed the 50 V absolute maximum rating on VM, including transients - select MOSFETs with at least 60 V V_DS and add a TVS or snubber across the motor terminals if the application has inductive kickback. Do not omit the charge-pump flying capacitors; without them the high-side gate drive fails and the high-side MOSFETs do not turn on fully, causing severe cross-conduction and overheating. Do not leave the STEP pin floating; tie it to GND or VCC through a resistor if unused. Verify that the ROSC and BLANK timing components match the chosen current-sense resistor and MOSFET switching characteristics.
Keep the gate-drive traces (OUT1A/OUT1B/OUT2A/OUT2B) short and direct - excessive trace inductance creates ringing that can exceed the MOSFET V_GS rating and injects EMI into nearby analog circuitry. Add 10 ohm to 100 ohm gate-source resistors on each external MOSFET to dampen ringing. Use a ground plane on layer 2 to provide a low-impedance return path for high-di/dt gate currents. Per typical Allegro reference designs, separate the analog VREF trace from digital STEP/DIR traces to avoid logic-noise coupling into the current-control loop.
Informations de conformité
RoHS compliant and lead-free per Allegro product page and distributor listings. REACH, halogen-free, and conflict-minerals compliance not explicitly disclosed in the verified web data; treat as unknown unless confirmed directly with Allegro. Part is not AEC-Q100 qualified; not intended for automotive safety-critical applications.
