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

STMicroelectronics L9026-B03N-TR

Name: L9026-B03N-TR
Brand: STMicroelectronics
SKU: L9026-B03N-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9026-B03N-TR

Manufacturer:: STMicroelectronics

Category:: Power Distribution Switches, Load Drivers

Package:: 24-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: L9026-B03N-TR.pdf

Description:: CONFIGURABLE MULTI CHANNEL RELAY

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Product details

Overview

L9026-B03N-TR from STMicroelectronics is an AEC-Q100 qualified, ISO 26262 ASIL-B compliant eight-channel automotive relay/LED driver IC with two fixed high-side (HS) and six configurable HS/LS drivers. It operates down to VBATT = 3 V during cranking, supports 3.3 V/5 V microcontroller I/O, and integrates reverse battery protection on VBATT and drain pins without external components. Used in body control modules for LED lighting and relay actuation in 12 V automotive systems.

For engineers reviewing the L9026-B03N-TR datasheet, L9026-B03N-TR pinout, L9026-B03N-TR application, or L9026-B03N-TR equivalent, key selection considerations include cranking voltage support (3–40 V), dual control modes (SPI + parallel IN0/IN1), limp home functionality via IDLE/IN pins, and package-specific safety pins (NRES/DIS in VFQFPN32).

Technical Context

The L9026 implements a dual-control architecture: SPI (16-bit frame, address feedback, parity, frame counter, short-frame detection) enables full channel configuration and diagnostics, while parallel inputs IN0/IN1 provide direct drive for two channels (default DRAIN2/SOURCE2 and DRAIN3/SOURCE3) with programmable mapping via MAP_IN0/MAP_IN1 registers. Limp home mode activates when IDLE = low and either IN0 or IN1 = high, bypassing SPI faults.

It features integrated safety monitoring including temperature sensing, overcurrent/overtemperature/open-load/short-to-GND detection, and supply UV monitoring on both VBATT and VDDIO. The device supports daisy-chaining via SPI and maintains operation under transient load-dump conditions up to 40 V with no reset assertion.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Range (VBATT)	3 V to 40 V - Enables reliable operation during cold-crank (3 V) and load-dump transients (40 V) in 12 V automotive systems.
Supply Range (VDDIO)	3.3 V or 5 V compatible - Direct interface with common MCU I/O voltages without level-shifting.
Output Channels	8 total: 2 fixed HS + 6 configurable HS/LS - Supports mixed resistive (relays), inductive (solenoids), and capacitive (LEDs) loads.
Diagnostic Coverage	ASIL-B compliant per ISO 26262 - Includes real-time open-load, short-to-GND, overcurrent, overtemperature, and supply UV detection.
SPI Interface	16-bit frame with address feedback, parity bit, frame counter, short-frame detection - Ensures robust communication integrity in noisy automotive environments.
Package	VFQFPN32 (5×5×1 mm, exposed pad) - Optimized thermal resistance (R_THj-a = 36 °C/W) for high-power driving in compact ECUs.
Quiescent Current (RESET)	< 100 µA - Minimizes battery drain during vehicle sleep mode.

Pinout & Package

VFQFPN32 package (5 mm × 5 mm × 1 mm, exposed thermal pad). Pin count: 32. Exposed pad must be left floating to enable reverse-battery protection on VBATT and drain pins.

Pin	Circuit Role	Design Meaning
1–6, 19–24, 27–31	Power transistor terminals (DRAIN/SOURCE)	Eight output channels: DRAIN0–DRAIN7 and SOURCE0–SOURCE7; DRAIN0/DRAIN1/SOURCE0/SOURCE1 are fixed HS; others configurable HS/LS.
7	NRES	Active-low reset input - Resets all registers and disables outputs; internal pull-down; requires SPI enable to activate logic.
8	DIS	Active-high channel disable - Forces all outputs OFF; internal pull-up; requires SPI enable to activate logic.
9–10	IN1, IN0	Parallel command inputs - Default mapped to DRAIN2/SOURCE2 and DRAIN3/SOURCE3; remappable via SPI register MAP_IN0/MAP_IN1.
12	GND	Analog/digital ground reference - Shared return path for VBATT, VDDIO, and output stages.
13	IDLE	Mode control input - Low + IN0/IN1 high → limp home; low + both IN low → sleep; high → active/idle depending on configuration.
14	VDDIO	Digital I/O supply - Powers SPI interface and logic; also serves as backup supply if VBATT undervolts.
15–18	SO, CLK, NCS, SI	SPI interface - Full-duplex 16-bit serial bus with error detection; supports daisy-chain topology.
29	VBATT	Main battery supply - Powers analog/digital core and output stages; monitored for UVLO (VBATT_UV_L = ~5.5 V).

Key Features

Feature	Design Value
Bulb Inrush Mode (BIM)	Configurable current-limiting profile for resistive/capacitive loads - Prevents false overcurrent trips during LED or incandescent lamp turn-on.
Limp Home Mode	Hardware-enabled fallback using IDLE and IN pins - Maintains partial functionality (two selected drivers) during SPI/microcontroller failure or supply UV.
Reverse Battery Protection	Integrated on VBATT and all DRAIN pins - No external diodes or MOSFETs required; enabled only when exposed pad is floating.
ASIL-B Safety Architecture	Dual-voltage monitoring (VBATT/VDDIO), register checksums, SPI frame validation, and latched fault reporting - Meets ISO 26262 requirements without external safety MCU.
Thermal Robustness	R_THj-a = 36 °C/W (VFQFPN32) - Sustains continuous 2 A per channel at T_a = 125 °C with standard 2s2p PCB layout.

Applications

Front Lighting Control

Rear Combination Lamp

Use Scenario: Driving high-intensity LED headlamps and DRLs in modern automotive front modules.

IC Role / Device Role / Timing Role: Eight-channel HS/LS driver managing individual LED strings and auxiliary functions (turn signal, position light) with BIM for inrush control.

Use Value: Eliminates need for discrete FETs and current-sense amplifiers; ASIL-B compliance reduces functional safety validation effort.

Use Scenario: Controlling brake lights, tail lamps, turn signals, and reversing lamps in rear lamp assemblies.

IC Role / Device Role / Timing Role: Configurable HS/LS outputs switch resistive filament bulbs and LEDs; limp home preserves brake light function during ECU faults.

Use Value: Single-chip solution replaces multiple relays and drivers; cranking support ensures brake light operation at 3 V battery voltage.

Body Control Module (BCM)

Seat & Mirror Control

Use Scenario: Power distribution and load switching for door locks, window lifts, and interior lighting in centralized BCMs.

IC Role / Device Role / Timing Role: Dual-mode control (SPI for precision, parallel IN0/IN1 for fast response) manages mixed inductive (locks) and resistive (LEDs) loads.

Use Value: Integrated diagnostics reduce wiring harness complexity and eliminate external fault-sensing circuits.

Use Scenario: Driving seat heater elements, mirror folding motors, and status LEDs in premium vehicle seating systems.

IC Role / Device Role / Timing Role: HS/LS flexibility supports PWM-controlled heaters (HS) and bidirectional motor drivers (LS); reverse battery protection secures against service errors.

Use Value: VFQFPN32 footprint saves PCB space vs. HTSSOP24; thermal performance enables >1.5 A continuous per channel in confined seat modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-channel automotive driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLE9201SE	4-channel HS driver only; no LS capability or parallel inputs; SPI interface lacks frame counter and address feedback.	Limited to simpler HS-only loads; no limp home or BIM; not suitable for mixed HS/LS or cranking-critical applications.	Select when only basic HS switching is needed and ASIL-B diagnostics are not required.
TPS4H160-Q1	4-channel HS driver with integrated current sense; no SPI, no parallel inputs, no limp home; supports 40 V but no cranking to 3 V.	Targeted at high-accuracy current monitoring; lacks configurability and fault resilience of L9026.	Prefer for applications requiring precise load current measurement over functional safety or multi-mode control.

Compared with TLE9201SE and TPS4H160-Q1, the L9026-B03N-TR uniquely combines eight configurable channels, cranking down to 3 V, limp home mode, and full ASIL-B diagnostic coverage - making it optimal for complex, safety-critical automotive body electronics where reliability across voltage extremes and fault conditions is mandatory.

Availability

L9026-B03N-TR is available at Aetrix Electronics and suitable for automotive body control modules, LED lighting systems, and relay-based power distribution requiring stable component supply across extended temperature (-40 °C to +125 °C ambient) and voltage (3–40 V) ranges.

Supply support for L9026-B03N-TR 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 broad portfolio certification to AEC-Q100 and ISO 26262 standards.

The L9026 belongs to ST's automotive smart power driver family, designed specifically for ASIL-B-compliant body electronics requiring high integration, cranking resilience, and hardware-based fault containment in space-constrained ECUs.

FAQ

What is the minimum VBATT voltage for guaranteed operation, and how does it affect channel control?

The L9026-B03N-TR guarantees full functionality down to VBATT = 6 V (normal operating range), but remains operational-albeit with degraded parameters-down to 3 V during cranking. Below VBATT_UV_L (~5.5 V), power stages are disabled and outputs turn OFF; SPI remains functional if VDDIO is valid. Cranking operation preserves limp home mode activation via IDLE/IN pins even at 3 V.

How does the VFQFPN32 package differ electrically and functionally from the HTSSOP24 version?

The VFQFPN32 adds two dedicated safety pins-NRES (active-low reset) and DIS (active-high channel disable)-not present in HTSSOP24. These require SPI configuration (CFG_0.NRES_N and CFG_0.DIS_EN bits) to activate. Thermally, VFQFPN32 offers lower R_THj-a (36 °C/W vs. 38 °C/W), enabling higher sustained current in compact layouts.

Can the L9026-B03N-TR drive inductive loads like solenoids or fuel injectors?

Yes-it supports inductive loads via its six configurable HS/LS channels. Each channel includes integrated clamp diodes and overcurrent protection. For solenoid driving, configure as HS with external flyback diode (recommended per DS13397 Figure 3), and use BIM mode to manage inrush. Peak current rating is 2.5 A per channel (DC), with SOA-limited pulsed capability.

Is daisy-chaining supported, and what SPI protocol extensions enable robust multi-device communication?

Yes-daisy-chaining is supported using standard 4-wire SPI with shared NCS, CLK, SI, and SO lines. Robustness is ensured by 16-bit frames with address feedback (prevents misalignment), parity bit (single-bit error detection), frame counter (sequence validation), and short-frame detection (identifies truncated commands). These features meet automotive EMC requirements per ISO 11898.

L9026-B03N-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 24-TSSOP (0.173", 4.40mm Width) Exposed Pad

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Switch Type:: General Purpose

Number of Outputs:: 8

Ratio - Input:Output:: 1:1

Output Configuration:: High Side or Low Side

Output Type:: -

Interface:: PWM, SPI

Voltage - Load:: 6V ~ 28V

Voltage - Supply (Vcc/Vdd):: Not Required

Current - Output (Max):: -

Rds On (Typ):: -

Input Type:: Non-Inverting

Features:: Slew Rate Controlled

Fault Protection:: Current Limiting (Fixed), Open Load Detect, Over Temperature, Short Circuit

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 24-HTSSOP

L9026-B03N-TR FAQ

1.How can I place an order for L9026-B03N-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9026-B03N-TR 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 L9026-B03N-TR reliable?

The price and inventory of L9026-B03N-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9026-B03N-TR is usually 5 days.

3.What payment methods are accepted for L9026-B03N-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9026-B03N-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9026-B03N-TR?

L9026-B03N-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9026-B03N-TR 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 L9026-B03N-TR?

For technical support, including L9026-B03N-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9026-B03N-TR requirements.

6.How does Aetrix verify that L9026-B03N-TR is sourced from the original manufacturer or authorized distributors?

All L9026-B03N-TR 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 L9026-B03N-TR meets industry standards.

7.What is the process for return or replacement of L9026-B03N-TR?

All L9026-B03N-TR units undergo pre-shipment inspection (PSI). If there is an issue with L9026-B03N-TR, 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 L9026-B03N-TR part is unused and in its original packaging.

Return procedure for L9026-B03N-TR:

1.Submit a request within 90 days.

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

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