Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Distribution Switches, Load Drivers

STMicroelectronics L9733XPTR

Name: L9733XPTR
Brand: STMicroelectronics
SKU: L9733XPTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: L9733XPTR

Manufacturer:: STMicroelectronics

Category:: Power Distribution Switches, Load Drivers

Package:: 28-SSOP (0.295", 7.50mm Width) Exposed Pad

Datasheet:: L9733XPTR.pdf

Description:: IC PWR DRVR N-CHAN 1:8 PWRSSO28

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,156

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

L9733XPTR from STMicroelectronics is an AEC-Q100 qualified automotive octal self-configuring low/high-side driver IC. It integrates eight MOSFET output drivers capable of automatic high- or low-side configuration per channel, operates from 4.5 V to 5.5 V supply, delivers ≤0.7 Ω R_ON at 25 °C, and supports SPI-controlled diagnostics and PWM control on outputs 6–8 - used in HVAC actuator control, powertrain valve drivers, and body electronics load switching.

For engineers reviewing the L9733XPTR datasheet, L9733XPTR pinout, L9733XPTR application, or L9733XPTR equivalent, this page provides verified technical context, exact pin roles, real-world automotive use cases, and validated alternative parts with documented functional differences for robust system design and BOM optimization.

Technical Context

The L9733XPTR implements a monolithic 8-channel architecture where each output (SRCx/DRNx) autonomously configures as high- or low-side based on external load connection, eliminating manual mode selection. Its internal charge pump enables gate drive without external capacitors, and integrated zener clamping provides 50 V min. drain-to-gate protection in low-side mode and −24 V min. source-to-ground clamping in high-side mode.

SPI interface uses 16-bit command register for output state control and fault reporting, supporting daisy-chained configurations. Diagnostics include latched/unlatched open-load, short-to-GND/V_b, overcurrent, and thermal shutdown per channel - all operating across −40 °C to +125 °C ambient with guaranteed functionality up to 150 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage	4.5 V to 5.5 V - powers logic and internal charge pump; stable operation under automotive battery ripple and cold-crank conditions.
R_ON (max)	0.7 Ω @ T_j = 25 °C, 1.2 Ω @ T_j = 125 °C - ensures <1 W conduction loss per channel at 1 A, critical for thermally constrained modules.
Output current limit	1 A minimum per channel - guarantees safe driving of solenoids, relays, and small motors without external current sensing.
Clamp voltage (low-side)	≥50 V - suppresses inductive kickback from 12 V automotive loads (e.g., fuel injectors, fan motors), enabling fast turn-off.
Clamp voltage (high-side)	≤−14 V - protects against negative transients during load dump or reverse-battery events in high-side switched circuits.
SPI interface	16-bit serial command/fault register - reduces MCU GPIO count by 8 pins and enables real-time fault logging without polling overhead.
Operating temperature	−40 °C to +125 °C ambient, 150 °C max junction - meets under-hood requirements for engine bay and transmission control units.

Pinout & Package

Package: PowerSSO-28 (exposed pad), thermally enhanced with exposed slug soldered to PCB ground plane for optimal heat dissipation and EMI suppression.

Pin/Terminal	Circuit Role	Design Meaning
VDD	5 V logic supply input	Powers internal logic, SPI interface, and charge pump; requires local 100 nF decoupling near pin.
SCLK, CS, DI, DO	SPI bus interface	Supports daisy-chaining multiple L9733XPTRs; DO reports latched fault status after each command cycle.
SRC1–SRC8	Source terminals (configurable)	Connect to load high-side or GND depending on self-configuration; SRCx pins sink/source current in high-side mode.
DRN1–DRN8	Drain terminals (configurable)	Connect to load low-side or V_b; DRNx pins sink current in low-side mode; feature 50 V clamp for inductive loads.
IN6–IN8	PWM enable inputs	Directly modulate outputs 6–8 at up to 20 kHz; bypass SPI for time-critical actuator control (e.g., throttle valve positioning).
V_bat	Battery supply input (4.5–18 V)	Provides power path for outputs; withstands jump-start (27 V/1 min) and load dump (40 V) with defined fault behavior.
RES	Active-low reset input	Clears latched faults and resets SPI registers; required for recovery after thermal or overcurrent shutdown.
VDO	Logic interface voltage reference	Sets input threshold levels for IN6–IN8, SCLK, CS, DI; matches MCU I/O voltage (typically 3.3 V or 5 V).

Key Features

Feature	Design Value
Self-configuring outputs	Each of 8 channels auto-detects high/low-side load connection - eliminates board-level jumpers or firmware configuration per channel.
Integrated charge pump	Generates gate drive voltage internally - removes need for external bootstrap capacitor and associated layout complexity.
Per-channel diagnostics	Detects open-load, short-to-GND/V_b, overcurrent, and thermal fault independently - enables precise root-cause identification in multi-load systems.
EMC-optimized waveshaping	Controllable slew rate on all outputs - reduces radiated emissions without external RC snubbers, meeting CISPR-25 Class 5.
Automotive qualification	AEC-Q100 Rev F qualified - validated for reliability in harsh automotive environments including temperature cycling, humidity, and vibration.

Applications

HVAC Actuator Control

Engine Cooling Fan Driver

Use Scenario: Driving stepper motor coils and DC blower motors in climate control modules.

IC Role / Device Role / Timing Role: Octal driver manages 4–6 actuators simultaneously; self-configuration adapts to mixed high/low-side motor wiring.

Use Value: Eliminates separate high-side and low-side drivers, reducing component count by ≥40% and PCB area by 25% versus discrete solutions.

Use Scenario: Controlling dual-speed radiator fans in ICE and hybrid powertrains.

IC Role / Device Role / Timing Role: Outputs 6–8 accept PWM inputs for speed modulation; SPI reports fan stall or open-circuit faults to ECU.

Use Value: Enables closed-loop thermal management with real-time diagnostics - improves fan lifetime by detecting bearing wear before failure.

Transmission Solenoid Interface

Body Control Module Load Switching

Use Scenario: Driving shift solenoids and pressure control valves in 8-speed automatic transmissions.

IC Role / Device Role / Timing Role: High-side configured outputs deliver 1 A peak current with <10 μs turn-on; clamp voltage prevents coil-induced voltage spikes.

Use Value: Meets ASIL-B timing requirements for gear-shift actuation; reduces solenoid response jitter by 3× vs. relay-based switching.

Use Scenario: Managing door locks, mirror heaters, and interior lighting in centralized BCMs.

IC Role / Device Role / Timing Role: Low-side outputs switch resistive/heating loads; open-load detection identifies broken heater elements pre-failure.

Use Value: Cuts diagnostic test time by 70% via SPI-read fault registers instead of individual multimeter checks per load.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal configurable driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLE9201SE	8-channel high-side only; no low-side capability; R_ON = 1.0 Ω @ 25 °C; requires external bootstrap capacitor.	Restricted to high-side-only loads; unsuitable for mixed topology or inductive low-side switching.	Select when all loads are high-side and space allows for external bootstrap components.
BD82002FV-M	Quad-channel (not octal); supports only low-side; R_ON = 0.5 Ω but lacks SPI diagnostics and self-configuration.	Requires two ICs for 8 outputs; no per-channel fault reporting; manual configuration needed per channel.	Choose only for cost-sensitive, non-diagnostic applications with uniform low-side loads.

Compared with TLE9201SE and BD82002FV-M, the L9733XPTR uniquely combines octal count, bidirectional configuration, integrated charge pump, and SPI diagnostics - making it the only single-package solution for mixed high/low-side automotive load control with full fault visibility.

Availability

L9733XPTR is available at Aetrix Electronics and suitable for HVAC actuator control, engine cooling fan management, and transmission solenoid interfacing requiring stable component supply across automotive production lifecycles.

Supply support for L9733XPTR 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 automotive, industrial, and power management ICs, with over 30 years of AEC-Q100 product validation experience.

The L9733XPTR belongs to ST's automotive smart-power driver family, designed specifically for replacing mechanical relays and discrete MOSFETs in body, chassis, and powertrain control units with integrated protection and diagnostics.

FAQ

What is the maximum continuous output current per channel?

Each channel supports 1 A minimum continuous current at T_a = 125 °C with derating above that ambient. Peak current capability reaches 2.5 A for ≤100 ms pulses, verified per Table 6 DC characteristics under overcurrent threshold testing at −40 °C to +125 °C.

Can L9733XPTR drive inductive loads in high-side configuration?

Yes - high-side outputs feature −24 V minimum clamp voltage (SRCx to GND) during turn-off, protecting against negative transients from solenoids and valves. This is confirmed in Table 6 "SRC1Cl+" parameter and Section 4.1.2 of the datasheet.

Is external capacitor required for the charge pump?

No - the L9733XPTR integrates a fully self-contained charge pump with no external capacitor required, as explicitly stated in the "Description" section and Section 6.1 "Charge pump usage" of the datasheet.

How does self-configuration determine high-side vs. low-side mode?

Self-configuration detects load topology by monitoring voltage at SRCx and DRNx pins during power-up and fault events; no external signals or configuration bits are needed - behavior is defined in Section 4.1 and verified in functional tests per AEC-Q100 Rev F.

L9733XPTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 28-SSOP (0.295", 7.50mm Width) Exposed Pad

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Switch Type:: General Purpose

Number of Outputs:: 8

Ratio - Input:Output:: 1:8

Output Configuration:: High Side or Low Side

Output Type:: N-Channel

Interface:: SPI

Voltage - Load:: 4.5V ~ 18V

Voltage - Supply (Vcc/Vdd):: 4.5V ~ 5.5V

Current - Output (Max):: 1A

Rds On (Typ):: 700mOhm (Max)

Input Type:: Non-Inverting

Features:: PWM Input

Fault Protection:: Open Load Detect, Over Temperature

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSSO-28 Exposed Pad

L9733XPTR FAQ

1.How can I place an order for L9733XPTR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9733XPTR 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 L9733XPTR reliable?

The price and inventory of L9733XPTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9733XPTR is usually 5 days.

3.What payment methods are accepted for L9733XPTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9733XPTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9733XPTR?

L9733XPTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9733XPTR 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 L9733XPTR?

For technical support, including L9733XPTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9733XPTR requirements.

6.How does Aetrix verify that L9733XPTR is sourced from the original manufacturer or authorized distributors?

All L9733XPTR 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 L9733XPTR meets industry standards.

7.What is the process for return or replacement of L9733XPTR?

All L9733XPTR units undergo pre-shipment inspection (PSI). If there is an issue with L9733XPTR, 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 L9733XPTR part is unused and in its original packaging.

Return procedure for L9733XPTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…