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STMicroelectronics L9026-YO-TR
- Part No.:
- L9026-YO-TR
- Manufacturer:
- STMicroelectronics
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
L9026-YO-TR.pdf
- Description:
- CONFIGURABLE MULTI CHANNEL RELAY
- Quantity:
- Payment:
- Shipping:
Inventory:2,460
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Product details
Overview
L9026-YO-TR from STMicroelectronics is an AEC-Q100 qualified, ISO 26262 ASIL-B compliant automotive multi-channel relay driver 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 - deployed in LED lighting and relay control modules for body electronics.
For engineers reviewing the L9026-YO-TR datasheet, L9026-YO-TR pinout, L9026-YO-TR application, or L9026-YO-TR equivalent, key selection criteria include cranking voltage margin (3 V), dual-control mode (SPI + parallel IN0/IN1), limp home activation via IDLE+INn, and HTSSOP24 package thermal resistance (RTHj-a = 38 °C/W).
Technical Context
The L9026-YO-TR implements a dual-mode control architecture: parallel inputs (IN0/IN1) map directly to default outputs (DRAIN2/SOURCE2 and DRAIN3/SOURCE3), while full channel configuration-including PWM assignment, safety register access, and diagnostic reporting-is managed via 16-bit SPI with address feedback, parity, frame counter, and short-frame detection.
Its safety subsystem includes real-time temperature monitoring, open-load/short-to-GND/overcurrent detection per channel, and fault-tolerant limp home mode triggered by IDLE=LOW + IN0/IN1=HIGH - independent of SPI functionality. The HTSSOP24 variant omits NRES/DIS pins, relying solely on SPI-configurable reset and disable logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range (VBATT) | 3 V to 40 V - enables operation during cold-crank (3–6 V), normal (6–18 V), and load-dump transients (up to 40 V) without external protection. |
| Digital I/O Supply (VDDIO) | 3.3 V or 5 V compatible - interfaces directly with automotive MCUs without level-shifting circuitry. |
| Output Channels | 8 total: 2 fixed HS (DRAIN0/SOURCE0, DRAIN1/SOURCE1) + 6 configurable HS/LS (DRAIN2–7/SOURCE2–7) - supports mixed resistive, inductive, and capacitive loads. |
| Diagnostic Coverage | Per-channel open-load, short-to-GND, overcurrent, and junction temperature monitoring - reported via SPI status registers (STA_0/STA_1). |
| Thermal Resistance (HTSSOP24) | RTHj-a = 38 °C/W (2s2p board, natural convection) - defines maximum power dissipation before thermal shutdown at Tj = 150 °C. |
| Quiescent Current (Sleep Mode) | < 100 µA at VBATT - ensures low battery drain during vehicle off-state in body control modules. |
| ESD Robustness | HBM ±2 kV, CDM ±500 V (corner pins ±750 V) - meets automotive EMC requirements without additional ESD protection diodes. |
Pinout & Package
Package: HTSSOP24 (7.8 × 6.4 × 1 mm), exposed pad down, RoHS-compliant. Pin count and function mapping are validated per DS13397 Rev 9 (pages 5–7). NRES and DIS pins are absent in this variant; all safety register control is SPI-managed.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery supply input | Main analog/digital supply; monitored for undervoltage (VBATT_UV); reverse-battery protected when exposed pad is floating. |
| 2 SOURCE0 | Fixed HS source | High-side output terminal for channel 0; connects to load high-side; rated for 42 V max drain-source voltage. |
| 3 DRAIN7 | Configurable HS/LS drain | Drain terminal for channel 7; configured as HS (load between DRAIN7 and VBATT) or LS (load between DRAIN7 and GND) via SPI. |
| 9 IN1 / 10 IN0 | Parallel command inputs | Direct drive inputs mapped by default to DRAIN2/SOURCE2 (IN0) and DRAIN3/SOURCE3 (IN1); overrideable via MAP_IN0/MAP_IN1 registers. |
| 12 IDLE | Mode control input | Low-active pin that triggers Sleep (IN0=IN1=LOW) or Limp Home (IN0 or IN1=HIGH); requires tIDLEFLT_max hold time for reliable transition. |
| 14–18 SO/CLK/NCS/SI | SPI interface | Full-duplex 16-bit SPI with address feedback, parity bit, frame counter, and short-frame detection - enables daisy-chaining even with 8-bit controllers. |
| 11 GND / 13 VDDIO | Reference & I/O supply | GND is analog/digital reference; VDDIO powers digital logic and buffers - enables operation when VBATT is below UV threshold. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL-B compliance | Full ISO 26262 hardware safety concept implemented - including internal diagnostics, safe state transitions, and fault-reporting registers. |
| Bulb Inrush Mode (BIM) | Programmable current-limiting profile optimized for tungsten filament lamps - prevents false overcurrent trips during cold-start surge. |
| Limp Home activation | Hardware-triggered fallback mode using only IDLE and IN0/IN1 pins - maintains critical outputs (e.g., hazard lights) during SPI/microcontroller failure. |
| Reverse battery protection | No external components required - achieved via internal topology and floating exposed pad - eliminates need for series diode or MOSFET. |
| Dual control interface | Simultaneous support for SPI (full configurability) and parallel inputs (fast deterministic response) - enables hybrid control architectures. |
Applications
| LED Headlamp Control | Power Window Relay Module |
|---|---|
|
Use Scenario: Driving high-current LED arrays in adaptive front-lighting systems (AFS) with dynamic dimming and fault reporting. IC Role / Device Role / Timing Role: Configurable HS/LS driver managing LED string current paths and thermal derating based on junction temperature feedback. Use Value: BIM mode prevents false open-load detection during LED cold-start; ASIL-B compliance satisfies functional safety requirements for Class C lighting. |
Use Scenario: Controlling up/down relays and window motor direction in centralized body control units (BCUs). IC Role / Device Role / Timing Role: Dual HS drivers (DRAIN0/SOURCE0, DRAIN1/SOURCE1) switch relay coils; configurable channels manage auxiliary functions like anti-pinch sensing. Use Value: Cranking down to 3 V ensures window operation during engine start; limp home mode retains emergency down-function if MCU fails. |
| Seat Heater Power Distribution | Door Lock Actuator Driver |
|
Use Scenario: Switching resistive heating elements in automotive seat heaters with overtemperature and open-circuit protection. IC Role / Device Role / Timing Role: HS/LS configuration allows direct ground-switching of heater elements; per-channel open-load detection identifies broken traces. Use Value: Integrated reverse battery protection eliminates external TVS diodes; low quiescent current (<100 µA) avoids battery drain during vehicle sleep. |
Use Scenario: Driving solenoid-based door lock/unlock actuators requiring bidirectional pulse control and stall detection. IC Role / Device Role / Timing Role: Configurable channels deliver timed ON/OFF pulses to lock/unlock coils; overcurrent detection identifies mechanical jam conditions. Use Value: SPI diagnostics report coil health to gateway ECU; ASIL-B compliance supports automated door lock safety integrity requirements. |
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 |
|---|---|---|---|
| TPS4H160-Q1 | 4-channel, fixed HS-only; no LS capability; lower channel count; integrated watchdog timer but no BIM mode. | Limited to simpler loads (e.g., single-relay modules); lacks configurable HS/LS flexibility for complex actuator control. | Select when system requires only HS switching with watchdog supervision and lower BOM cost is prioritized over channel versatility. |
| BD3903FV-M | 8-channel, HS-only; no LS configuration; no limp home mode; no SPI daisy-chain; higher RDS(on) (120 mΩ vs. 80 mΩ typical). | Suitable for non-safety-critical lighting only; cannot replace L9026-YO-TR in ASIL-B systems due to missing ISO 26262 documentation. | Choose only for cost-sensitive interior lighting where functional safety certification is not required. |
Compared with TPS4H160-Q1 and BD3903FV-M, the L9026-YO-TR uniquely combines ASIL-B compliance, cranking down to 3 V, BIM for incandescent loads, and true HS/LS configurability - making it the only option for safety-critical, mixed-load automotive modules requiring field-upgradable control.
Availability
L9026-YO-TR is available at Aetrix Electronics and suitable for automotive body electronics, LED lighting control, power distribution modules, and safety-critical relay driver applications requiring stable component supply across extended temperature (-40 °C to +125 °C ambient) and long lifecycle commitments.
Supply support for L9026-YO-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 manufacturing scale and AEC-Q100/ISO 26262 design expertise.
The L9026 belongs to ST's automotive smart power driver family, engineered specifically for ASIL-B body electronics requiring robust diagnostics, cranking resilience, and flexible load switching - targeting next-generation BCUs and domain controllers.
FAQ
What is the minimum VBATT voltage required for L9026-YO-TR to operate in active mode?
The L9026-YO-TR guarantees full functionality down to VBATT = 3 V during cranking scenarios, with all eight channels operable and diagnostics active. Below 3 V, the device enters a safety state with all outputs disabled. Normal operation resumes automatically when VBATT rises above 6 V, per DS13397 Rev 9 Section 6.2.
Does L9026-YO-TR support daisy-chained SPI communication?
Yes - the L9026-YO-TR supports daisy-chained SPI configurations even with 8-bit microcontrollers, using its 16-bit frame format with address feedback, parity bit, frame counter, and short-frame detection. This enables scalable multi-device control without additional GPIOs or address decoding logic.
How is limp home mode activated on the HTSSOP24 package?
Limp home mode is activated on L9026-YO-TR (HTSSOP24) by asserting IDLE = LOW while at least one of IN0 or IN1 is HIGH. No NRES or DIS pins are present in this package; the mode is purely hardware-triggered and remains active regardless of SPI faults or microcontroller resets.
What thermal considerations apply to the HTSSOP24 package in continuous operation?
The HTSSOP24 package has RTHj-a = 38 °C/W (2s2p board, natural convection). At maximum ambient (125 °C) and Tj = 150 °C, maximum allowable power dissipation is ~0.66 W. Layout must ensure exposed pad is floating (not soldered) to maintain reverse-battery protection and avoid thermal derating penalties.
L9026-YO-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:
- 1:4
- 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-YO-TR FAQ
1.How can I place an order for L9026-YO-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L9026-YO-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-YO-TR reliable?
The price and inventory of L9026-YO-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-YO-TR is usually 5 days.
3.What payment methods are accepted for L9026-YO-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9026-YO-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L9026-YO-TR?
L9026-YO-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L9026-YO-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-YO-TR?
For technical support, including L9026-YO-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9026-YO-TR requirements.
6.How does Aetrix verify that L9026-YO-TR is sourced from the original manufacturer or authorized distributors?
All L9026-YO-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-YO-TR meets industry standards.
7.What is the process for return or replacement of L9026-YO-TR?
All L9026-YO-TR units undergo pre-shipment inspection (PSI). If there is an issue with L9026-YO-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-YO-TR part is unused and in its original packaging.
Return procedure for L9026-YO-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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