A6861: Automotive 3-Phase Isolator MOSFET Driver

The A6861 is an N-channel power MOSFET driver capable of controlling MOSFETs connected as a 3-phase solid state relay in phase-isolation applications. The A6861 is intended for automotive systems that must meet ASIL requirements. In safety critical applications, motor isolation is a critical safety requirement which is currently addressed with discrete circuitry or relays. Allegro A2-SILTM products include specific features that compliment proper system design, allowing users to achieve up to ASIL-D system rating.

The A6861 has three independent floating gate drive outputs to maintain the power MOSFETs in the ON state over the full supply range with high phase-voltage slew rates. An integrated charge pump regulator provides the above battery supply voltage necessary to maintain the power MOSFETs in the ON state continuously when the phase voltage is equal to the battery voltage. The charge pump will maintain sufficient gate drive (>7.5 V) for battery voltages down to 4.5 V with 100 kΩ gate-source resistors.

The three gate drives can be independently controlled by a logic level control input. In typical applications, the MOSFETs will be switched on within 8 μs and will switch off within 1 μs.

An undervoltage monitor checks that the pumped supply voltage is high enough to ensure that the MOSFETs are maintained in a safe conducting state.

The A6861 is supplied in a 16-lead TSSOP (LP), with exposed pad for enhanced thermal dissipation. They are lead (Pb) free, with 100% matte tin leadframe plating.

ASIL LogoAllegro's A6861 is a Quality Managed (QM) product that has been developed according to the automotive quality requirements of TS 16949 and contains features targeted for automotive safety applications. This product can be qualified for use in accordance with ISO 26262 in compliant safety systems by ensuring a robust integration of the component into the system design. Safety documentation will be provided to support and guide the integration process.


  • 3-phase safety disconnect systems
  • Electric power steering (EPS)
  • Electric braking
  • 3-phase solid state relay driver

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • 3 floating N-channel MOSFET drives
  • Maintains VGS with 100 kΩ gate-source resistors
  • Integrated charge pump controller
  • 4.5 to 50 V supply voltage operating range
  • Independent TTL input for each phase
  • 150°C ambient (165°C junction) continuous
  • A2-SILTM Product – device features for safety-critical systems

Design Support Tools

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Product Image Functional Block Diagram Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
APEK6861KLP-01-T DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check Stock
A6861KLPTR-T 16-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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