L99SM81VQ6 STMicroelectronics Integrated Circuit (Quad Flat No-Lead) In Stock
STMicroelectronics L99SM81VQ6 is an automotive-grade programmable stepper motor driver with micro-stepping and stall detection for HVAC flap, mirror adjustment, and instrument cluster actuators. It integrates SPI configuration, over-current protection, and thermal shutdown in a 40-pin QFN package rated to 260°C reflow. Designed for 12 V automotive systems requiring precise positional control with minimum external components.
- Manufacturer
- STMicroelectronics
- Package
- Quad Flat No-Lead
- Pin Count
- 41
- Lifecycle
- NOT RECOMMENDED
- Datasheet
- L99SM81VQ6 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of L99SM81VQ6?
- Automotive AEC-Q100 qualified stepper motor driver with integrated micro-stepping for smooth 12 V motor control in HVAC and mirror actuators
- Built-in stall detection eliminates need for external position sensors, reducing BOM and enabling accurate end-stop detection in automotive flap actuators
- 40-pin QFN with exposed heat slug supports peak 260°C reflow, enabling high-density automotive PCB assembly with integrated over-current and thermal protection
What is L99SM81VQ6 used for?
The L99SM81VQ6 is designed for automotive stepper motor control applications including HVAC air flap actuators, headlamp leveling motors, mirror adjustment systems, and instrument cluster pointer drives requiring smooth micro-stepping and reliable stall detection. Its SPI programmability and AEC-Q100 qualification make it suitable for body control module integration where multiple stepper axes must be managed with minimal microcontroller GPIO overhead.
What are the specifications of L99SM81VQ6?
| YTEOL | 3 |
| Analog IC - Other Type | STEPPER MOTOR CONTROLLER |
| JESD-30 Code | S-XQCC-N40 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LCC40,.25SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG |
| Peak Reflow Temperature (Cel) | 260 |
| Screening Level | AEC-Q100 |
| Supply Current-Max (Isup) | 6mA |
| Supply Voltage-Max (Vsup) | 28V |
| Supply Voltage-Min (Vsup) | 6V |
| Supply Voltage-Nom (Vsup) | 13.5V |
| Surface Mount | YES |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the L99SM81VQ6 datasheet?
L99SM81VQ6 Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for L99SM81VQ6?
Compatible alternatives and drop-in replacements for L99SM81VQ6:
Frequently Asked Questions
What micro-stepping capability does L99SM81VQ6 provide for smooth automotive motor control?
The L99SM81VQ6 supports programmable micro-stepping modes via its SPI interface, enabling smooth stepper motor movement down to 1/16 step or finer resolution compared to full-step operation. This reduces audible motor noise and mechanical vibration in cabin HVAC air flap actuators and headlamp aiming motors, which must operate quietly in close proximity to vehicle occupants. Micro-stepping also improves positional accuracy to within 1/16 of a full 1.8° or 7.5° step angle.
How does the stall detection in L99SM81VQ6 simplify end-stop calibration in automotive actuator designs?
L99SM81VQ6's integrated stall detection monitors back-EMF or current signature to identify when the stepper motor has reached a mechanical stop, triggering a stall flag over SPI without requiring a separate limit switch or Hall sensor. This eliminates 2 external digital inputs and associated wiring harness connections per actuator, reducing system cost in multi-flap HVAC controllers. End-stop calibration on power-up completes in under 500 ms by driving the motor to the stall position at reduced current.
For a 12 V automotive HVAC system, how many L99SM81VQ6 drivers can a single SPI bus control?
Each L99SM81VQ6 uses a dedicated SPI chip-select line, so a single 4-wire SPI bus with N chip-select GPIO pins can control N independent L99SM81VQ6 stepper drivers daisy-chained or independently addressed. A typical automotive HVAC system with 6 air flap actuators requires 6 chip-select lines on the host MCU, with each driver handling 1 bipolar stepper motor up to the driver's rated current, typically 1 A to 2 A per phase at 12 V in a 40-pin QFN footprint of approximately 6 mm x 6 mm.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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