Octal configurable low/high side driver

The L9733 is a highly flexible monolithic, medium current, output driver that incorporates 8 outputs that can be used as either internal low or high-side drives in any combination.

Outputs 1-8 are self-configuring as high or low-side drives. Self-configuration allows a user to connect a high or low-side load to any of these outputs and the L9733 will drive them correctly as well as provide proper fault mode operation with no other needed inputs. In addition, outputs 6, 7 and 8 can be PWM controlled via a external pins (IN6-8).

This device is capable of switching variable load currents over the ambient range of -40 °C to +125 °C. The outputs are MOSFET drivers to minimize Vdd current requirements. For low-side configured outputs an internal zener clamp from the drain to gate with a breakdown of 50 V minimum will provide fast turn off of inductive loads. When a high-side configured output is commanded Off after having been commanded On, the source voltage will go to (VGND - 15 V).

An 16 bit SPI input is used to command the 8 output drivers either "On" or "Off", reducing the I/O port requirement of the microcontroller. Multiple L9733 can be daisy-chained. In addition the SPI output indicates latched fault conditions that may have occurred.

Key Features

  • AEC-Q100 (Rev. F) qualified
  • Eight independently self configuring low/high drivers
  • Supply voltage from 4.5 V to 5.5 V
  • RON(max) = 0.7 Ω @ Tj = 25 °C,RON(max) = 1.2 Ω @Tj = 125 °C
  • Minimum current limit of each output 1 A
  • Output voltage clamping min. 40 V in low-side configuration
  • Output voltage clamping max. -14 V in high-side configuration
  • SPI interface for outputs control and for diagnosis data communication
  • Additional PWM inputs for 3 outputs
  • Independent thermal shutdown for all outputs open load, short to GND, short to Vb, overcurrent diagnostics in latched or unlatched mode for each channel
  • Internal charge pump without need of external capacitor
  • Controlled SR for reduced EMC



Description Version Size
DS4285 DS4285: Automotive octal self configuring low/high side driver 12.0 567 KB
Description Version Size
AN4402 AN4402: Multichannel drivers driving inductive loads with L99MC6 and L9733 1.1 604 KB


型号 Package Packing Type Operating Temperature (°C) (min) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
L9733XPTR PowerSSO 28 7.5x10.3 Tape And Reel - Active 2.38 1000 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
L9733CN PowerSSO 28 7.5x10.3 Tube - Active - - NEC EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office
L9733XP PowerSSO 28 7.5x10.3 Tube - Active 2.38 1000 NEC EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors


型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L9733CNTR ActivePowerSSO 28 7.5x10.3AutomotiveEcopack2
L9733XPTR ActivePowerSSO 28 7.5x10.3AutomotiveEcopack2
L9733CN ActivePowerSSO 28 7.5x10.3AutomotiveEcopack2
L9733XP ActivePowerSSO 28 7.5x10.3AutomotiveEcopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.