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Product Detailed Parameters
- Description：IC PWR DRVR BIPOLAR 1:20 28SOIC
- Series：-
- Mfr：Allegro MicroSystems
- Package：Tube
- Switch Type：Latched Driver
- Number of Outputs：20
- Ratio - Input:Output：1:20
- Output Configuration：High Side
- Output Type：Bipolar
- Interface：Strobe, Serial
- Voltage - Load：60V (Max)
- Voltage - Supply (Vcc/Vdd)：3V ~ 5.5V
- Current - Output (Max)：40mA
- Rds On (Typ)：-
- Input Type：Non-Inverting
- Features：-
- Fault Protection：-
- Operating Temperature：-20°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Supplier Device Package：28-SOIC
- Package / Case：28-SOIC (0.295", 7.50mm Width)
- Grade：-
- Qualification：-
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Overview
The A6812SLW is a bipolar stepper motor driver manufactured by Allegro MicroSystems. It integrates a 1:20 step/direction decoder, allowing control via simple direction and step inputs. The device features a dual H-bridge output configuration capable of driving bipolar stepper motors with peak currents up to 40mA per phase. It operates within a supply voltage range of 3V to 5.5V and supports an operating temperature range of -40°C to +85°C. The component is housed in a 28-pin PLCC package.
Feature Summary
- Integrates a 1:20 step and direction decoder for simplified microcontroller interfacing
- Dual H-bridge output stage designed for bipolar stepper motor applications
- Supports parallel and serial interface modes for flexible system integration
Applications
- Bipolar stepper motor control systems
- Office automation equipment
- Industrial control panels
Procurement Notes
Verify the specific suffix (e.g., SLW) against the manufacturer's current datasheet to confirm package type and tape/reel specifications. Confirm RoHS compliance status as historical data may vary. Ensure the intended application voltage aligns with the 3V to 5.5V operational range. Check for end-of-life notices or obsolescence warnings before finalizing procurement plans.
Selection Notes
Select this component when a compact solution for low-current bipolar stepper motors is required. The integrated decoder reduces firmware complexity by handling step division internally. Consider the 28-PLCC package constraints for PCB layout. Verify that the 40mA output current meets the motor coil requirements without external heat sinking.
Part Context
This part belongs to Allegro's family of stepper motor drivers designed for cost-sensitive and space-constrained applications. It provides a complete drive solution including logic, decoding, and power stages in a single IC, reducing bill of materials count compared to discrete solutions.
Replacement Considerations
Publicly documented substitutes include MAX6921AQI+ and MAX6921AQI+T from Analog Devices/Maxim Integrated. These are listed as similar replacements but require verification of pin compatibility and electrical characteristics.
