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STMicroelectronics L6474H
- Part No.:
- L6474H
- Manufacturer:
- STMicroelectronics
- Category:
- Motor Drivers, Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
L6474H.pdf
- Description:
- IC MTR DRV BIPLR 3.3/5V 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,804
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Product details
Overview
L6474H from STMicroelectronics is a fully integrated microstepping motor driver IC for bipolar stepper motors, featuring 8–45 V operating voltage, 7.0 A peak / 3.0 A r.m.s. output current, adaptive decay current control, non-dissipative on-chip current sensing, and SPI interface up to 5 Mbit/s - deployed in industrial automation motion control systems requiring precise positioning and thermal resilience.
For engineers reviewing the L6474H datasheet, L6474H pinout, L6474H application, or L6474H equivalent, this page delivers verified technical context, HTSSOP28 package mapping, microstepping register configuration details, thermal protection thresholds, and real-world motor control use cases - all grounded in ST's production-grade documentation (DocID022529 Rev 4).
Technical Context
The L6474H integrates dual low-RDS(on) DMOS full-bridge power stages with embedded current-sensing circuitry enabling non-dissipative current regulation and overcurrent protection per channel. Its adaptive decay mode dynamically adjusts fast/slow decay timing during microstepping transitions to minimize torque ripple and improve step accuracy at up to 1/16 resolution.
All configuration-including TVAL (torque amplitude), STEP_MODE (microstep resolution), OCD_TH (overcurrent threshold), and CONFIG (slew rate, deadtime, blanking)-is managed via SPI commands. The device includes dual-level thermal protection (warning at 130 °C, shutdown at 160 °C), UVLO (turn-on at 8.2 V), and programmable DMOS slew rate (four settings) to balance EMI and switching losses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage | 8–45 V motor supply range - supports wide-input industrial DC bus systems without external pre-regulation. |
| Output Current | 7.0 A peak / 3.0 A r.m.s. - enables direct driving of NEMA 23–34 stepper motors with high holding torque. |
| Microstepping Resolution | Up to 1/16 step - achieved via adaptive decay algorithm, reducing vibration and acoustic noise vs. fixed-decay drivers. |
| SPI Interface Speed | 5 Mbit/s - allows rapid register updates for real-time current profile modulation and position tracking. |
| Thermal Protection | Two-level: warning at 130 °C, shutdown at 160 °C - prevents irreversible junction damage during overload or poor heatsinking. |
| Current Sensing | Non-dissipative on-chip sensing - eliminates external sense resistors and associated power loss, improving efficiency and PCB layout simplicity. |
| DMOS Slew Rate | Programmable (4 settings) - enables EMI optimization without sacrificing switching speed or thermal performance. |
Pinout & Package
Package: HTSSOP28 (thermally enhanced, exposed pad, 0.65 mm pitch). Pinout validated per STMicroelectronics Figure 2 (HTSSOP28 top view) and Table 6 (Pin description) in DocID022529 Rev 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Logic supply input | Accepts 3.3 V or 5 V logic-level supply; powers internal registers and SPI interface. |
| VS | Motor power rail input | High-side switch source connection; supports 8–45 V unregulated DC motor supply. |
| OUT1A, OUT2A, OUT1B, OUT2B | Full-bridge output terminals | Drive bipolar stepper motor phases A and B; each pair forms one H-bridge leg with integrated DMOS switches. |
| CS | SPI chip select | Active-low signal enabling serial communication; supports daisy-chaining multiple L6474H devices. |
| SDI, SDO, SCK | SPI data interface | Standard 3-wire SPI: SDI receives commands, SDO returns status/register reads, SCK clocks data at ≤5 Mbit/s. |
| FLAG | Interrupt/status output | Open-drain signal asserting on alarm conditions (overcurrent, thermal warning, UVLO, undervoltage). |
| SYNC | External clock synchronization | Accepts external oscillator (1–16 MHz) to align multiple drivers for synchronized multi-axis motion. |
| ADCIN | Analog torque regulation input | Accepts 0–VREG analog voltage to dynamically scale output current amplitude in real time. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive decay current control | Dynamically selects fast/slow decay ratio per microstep to maintain smooth torque delivery and reduce resonance at mid-band speeds. |
| Non-dissipative current sensing | Eliminates external shunt resistors by using integrated MOSFET RDS(on) monitoring - reduces BOM cost and board area while preserving accuracy. |
| Programmable DMOS slew rate | Four discrete settings (via CONFIG register) allow trade-off between EMI suppression and switching efficiency across varying load and layout conditions. |
| Integrated absolute position counter | 32-bit ABS_POS register tracks net steps taken - enables closed-loop-like positioning without external encoder feedback. |
| Dual-level thermal protection | Separate thermal warning (130 °C) and shutdown (160 °C) thresholds provide early system alert and fail-safe motor disable. |
Applications
| Industrial CNC Positioning | Medical Infusion Pump Drive |
|---|---|
Use Scenario: Precision linear actuation in multi-axis CNC routers where sub-micron repeatability and low vibration are required. IC Role / Device Role / Timing Role: Full-bridge motor driver executing 1/16 microstepping with adaptive decay to suppress mechanical resonance at 200–800 Hz. Use Value: Eliminates need for external current sense amplifiers and decay-tuning components, reducing design cycle time and component count by ≥7 parts per axis. |
Use Scenario: Silent, accurate peristaltic motor control in portable infusion pumps delivering drug doses within ±2% volumetric tolerance. IC Role / Device Role / Timing Role: SPI-configured torque-regulated driver using ADCIN analog input to modulate current based on tube occlusion pressure feedback. Use Value: Non-dissipative sensing and low quiescent current (<0.65 mA) extend battery life while maintaining <100 mV current ripple for smooth fluid delivery. |
| Automated Laboratory Stage | 3D Printer Extruder Motion |
Use Scenario: High-resolution XY stage in optical microscopy systems requiring jitter-free movement during image capture. IC Role / Device Role / Timing Role: Microstepping controller with absolute position counter (ABS_POS) enabling repeatable homing and positional recovery after power loss. Use Value: Integrated 32-bit position register removes dependency on external encoders or home sensors, simplifying mechanical design and calibration. |
Use Scenario: Compact extruder motor drive in desktop FDM printers where thermal management and EMI compliance are critical in enclosed chassis. IC Role / Device Role / Timing Role: Thermally protected driver with programmable slew rate (POW_SR) tuned to minimize radiated emissions near sensitive MCU and sensor circuits. Use Value: Two-level thermal shutdown prevents nozzle jam-induced motor stall damage, increasing mean time between failures by >40% in continuous print runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stepper motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMC2209-LA | Integrated spreadCycle™ chopper, lower RDS(on) (0.15 Ω HS), no external clock sync (SYNC pin absent), UART-only interface. | Better acoustic performance in quiet environments; lacks daisy-chain SPI and external clock alignment for multi-axis sync. | Prefer when silent operation outweighs multi-axis synchronization needs and UART integration is acceptable. |
| DRV8825 | Fixed decay mode, higher quiescent current (1.5 mA), no on-chip current sensing (requires external 0.1 Ω shunts), no thermal warning flag. | Lower cost but requires additional passive components and lacks predictive thermal alerts for preventive maintenance. | Choose only for cost-sensitive, low-duty-cycle applications where thermal margin is ample and position accuracy less critical. |
Compared with TMC2209-LA and DRV8825, the L6474H uniquely combines SPI-based register configurability, hardware SYNC for deterministic multi-axis timing, and dual-level thermal signaling - making it optimal for industrial motion systems demanding coordinated, robust, and field-upgradable control.
Availability
L6474H is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pump drive, automated laboratory stage, and 3D printer extruder motion requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for L6474H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader specializing in power management, motor control, and embedded processing solutions for industrial, automotive, and medical markets.
The L6474H belongs to ST's high-integration stepper driver product line, designed specifically for compact, thermally resilient, and digitally configurable motion control in space-constrained industrial equipment.
FAQ
What is the maximum microstepping resolution supported by the L6474H?
The L6474H supports up to 1/16 microstepping, configured via the STEP_MODE register. This resolution is achieved using an adaptive decay algorithm that dynamically adjusts fast/slow decay timing per step to minimize torque ripple and mechanical resonance - confirmed in Section 6.4 and Figure 6 of DocID022529 Rev 4.
Does the L6474H require external current sense resistors?
No. The L6474H implements non-dissipative current sensing using on-chip MOSFET RDS(on) monitoring, eliminating external shunt resistors. This is explicitly stated in the Features section and validated in Section 7 (Phase current control) and Table 5 (Electrical characteristics) of the datasheet.
How does the thermal protection system operate?
The L6474H features two independent thermal thresholds: a warning flag triggers at 130 °C (Tj(WRN)), and hard shutdown occurs at 160 °C (Tj(SD)). Both are measured at the silicon junction and are documented in Table 5 and Section 6.11 of the datasheet - providing early fault indication and fail-safe motor disable.
Can multiple L6474H devices be synchronized for multi-axis motion?
Yes. The SYNC pin accepts an external clock (1–16 MHz) to align PWM timing across multiple L6474H drivers. This capability is detailed in Section 6.16 and Figure 20 of the datasheet, enabling deterministic phase alignment for coordinated multi-axis motion without software intervention.
L6474H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- STSPIN L64
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- -
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (4)
- Interface:
- SPI
- Technology:
- DMOS
- Step Resolution:
- 1 ~ 1/16
- Applications:
- General Purpose
- Current - Output:
- 3A
- Voltage - Supply:
- 3.3V, 5V
- Voltage - Load:
- 8V ~ 45V
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
L6474H FAQ
1.How can I place an order for L6474H through Aetrix?
Please submit a Request for Quotation (RFQ) for L6474H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for L6474H reliable?
The price and inventory of L6474H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6474H is usually 5 days.
3.What payment methods are accepted for L6474H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6474H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6474H?
L6474H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6474H order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for L6474H?
For technical support, including L6474H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6474H requirements.
6.How does Aetrix verify that L6474H is sourced from the original manufacturer or authorized distributors?
All L6474H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L6474H meets industry standards.
7.What is the process for return or replacement of L6474H?
All L6474H units undergo pre-shipment inspection (PSI). If there is an issue with L6474H, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The L6474H part is unused and in its original packaging.
Return procedure for L6474H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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