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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear + Switching

STMicroelectronics L9305EP-TR

Name: L9305EP-TR
Brand: STMicroelectronics
SKU: L9305EP-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9305EP-TR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear + Switching

Package:: -

Datasheet:: L9305EP-TR.pdf

Description:: PTS ASSP

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Product details

Overview

L9305EP-TR from STMicroelectronics is a configurable 4-channel automotive solenoid driver IC qualified to AEC-Q100 Grade 0, supporting high-side or low-side configuration per channel, ±5 mA current accuracy (0–0.5 A), 375 mΩ max R_DS(ON) @ 175 °C, and ISO 26262 ASIL-D compliance for transmission valve control.

For engineers reviewing the L9305EP-TR datasheet, L9305EP-TR pinout, L9305EP-TR application, or L9305EP-TR equivalent, this page delivers verified technical context, SPI register-level diagnostics, fail-safe pre-driver architecture, and validated alternatives for linear solenoid control in safety-critical automotive systems.

Technical Context

The L9305EP-TR implements four independent current-regulated drivers with dual-path redundancy: each channel integrates both power and recirculation transistors plus two independent current-sense paths-ensuring fault-tolerant measurement per solenoid. Its charge pump (VCP/VC1–VC4) enables high-side drive capability up to 2 A while maintaining V_DS monitoring on external fail-safe FETs via FS_Dx/FS_Sx/FS_Gx pins.

SPI communication uses 32-bit frames with 5-bit CRC, frame counter, and long/short frame detection for secure configuration and real-time status reporting-including BIST-based self-test, temperature monitoring, EEPROM CRC-protected calibration memory, and programmable dither modulation over set-point current.

Key Specifications

Parameter	Value and Actual Design Meaning
Driver Channels	4 independent, configurable as HS or LS per channel-enables mixed topology for multi-valve transmission modules.
Current Range & Accuracy	0–1.5 A (±5 mA ≤0.5 A; ±1% >0.5 A); extended 0–2 A (±15 mA ≤0.3 A; ±5% 0.3–0.5 A; ±4% 0.5–2 A)-supports precise force control across solenoid stroke profiles.
R_DS(ON) Max	375 mΩ @ T_j = 175 °C-guarantees thermal robustness in under-hood environments without derating.
Current Set Resolution	13-bit (0.25 mA step in normal range; 0.33 mA in extended range)-enables fine-grained PWM-independent current tuning.
SPI Interface	32-bit frame with 5-bit CRC, address feedback, frame counter, and long/short frame detection-prevents command injection and ensures deterministic fault reporting.
Safety Certification	AEC-Q100 Grade 0 (−40 °C to +135 °C ambient), ISO 26262 ASIL-D ready-validated for automatic transmission, ESC, and active suspension ECU integration.
Fault Coverage	Redundant current sensing, V_DS monitoring on fail-safe FETs, core overtemperature detection, EEPROM CRC, and SPI timeout latching-meets ASIL-D diagnostic coverage targets.

Pinout & Package

Package: PowerSSO-36 (exposed pad down, 7.0 × 6.0 × 1.0 mm), thermally optimized for high-power solenoid drive with R_θj-a = 22 °C/W (2s2p board, natural convection).

Pin/Terminal	Circuit Role	Design Meaning
VS_SOL0–VS_SOL3	Channel Supply Input	Switched battery voltage input per channel (max 40 V), supports reverse-polarity protection diode connection.
LOAD_SOL0–LOAD_SOL3	Power Output	High-current output node connecting to solenoid coil; supports HS/LS topology based on internal driver configuration.
GND_SOL0–GND_SOL3	Channel Ground Return	Dedicated low-inductance ground path per channel-minimizes crosstalk and enables independent current sensing.
FS_D0–FS_D3, FS_S0–FS_S3, FS_G0–FS_G3	Fail-Safe Pre-Driver Interface	Three-terminal interface to external N-FET for redundant hardware shutdown; FS_D/FS_S monitor V_DS, FS_G controls gate.
EN_DR	Global Enable Input	Active-high hardware enable disabling all channels and fail-safe pre-drivers; echoes state in SPI status register.
RESn	Asynchronous Reset	Active-low reset forcing all registers to defaults, disabling outputs, and pulling FAULTn low-internally pulled down if floating.
FAULTn	Open-Drain Fault Output	Asserted low on unmasked faults (e.g., overtemperature, open load, VDD UV/OV, SPI timeout); requires external pull-up to VDDIO.
MOSI/SCLK/MISO/CS	SPI Interface	3.3 V/5 V tolerant digital interface with CRC-protected 32-bit frames-supports daisy-chaining and error-resilient diagnostics.

Key Features

Feature	Design Value
Redundant Current Sensing	Two independent sense paths per channel-guarantees fault detection even if one path fails, satisfying ASIL-D diagnostic requirements.
Programmable Dither Modulation	Configurable frequency/amplitude dither superimposed on set-point current-reduces solenoid hysteresis and improves linearity in closed-loop position control.
Variable Slew Rate Control	Selectable rise/fall time for LOAD_SOL outputs-minimizes EMI during switching while preventing mechanical shock in fast-acting valves.
Secure SPI Communication	Address feedback, 5-bit CRC, frame counter, and long/short frame detection-prevents replay attacks and ensures command integrity in safety-critical networks.
Calibration Memory with CRC	On-chip EEPROM stores trimmed ADC/CSA parameters with CRC checksum-eliminates external calibration storage and ensures startup accuracy.

Applications

Automatic Transmission Valve Control

Electronic Stability Control (ESC) Modulators

Use Scenario: Precise current regulation of linear solenoids controlling clutch pressure and gear shift timing in 8-speed automatic transmissions.

IC Role / Device Role / Timing Role: Primary solenoid driver with closed-loop current control, dither modulation, and real-time fault reporting via SPI to transmission ECU.

Use Value: Enables <1% current error across temperature, reducing shift jerk and extending solenoid life while meeting ASIL-D functional safety goals.

Use Scenario: Driving hydraulic modulator solenoids in ESC systems to apply individual wheel braking during stability interventions.

IC Role / Device Role / Timing Role: High-reliability valve actuator with redundant current sensing and fail-safe pre-driver-ensures safe torque reduction during critical events.

Use Value: Dual-path current monitoring and V_DS-monitored external FET shutdown guarantee fail-operational behavior per ISO 26262 Annex D.

Active Suspension Damping Valves

Engine Variable Valve Timing (VVT) Actuators

Use Scenario: Controlling semi-active shock absorber damping force by regulating current through proportional solenoid valves in real time.

IC Role / Device Role / Timing Role: Fast-response solenoid driver with programmable slew rate and 13-bit resolution-supports adaptive damping algorithms at 100 Hz+ update rates.

Use Value: Sub-millisecond response and ±4% accuracy up to 2 A allow dynamic ride height and roll control without mechanical backlash.

Use Scenario: Actuating oil-control valves (OCVs) in cam phasing systems to adjust intake/exhaust valve timing based on engine load and RPM.

IC Role / Device Role / Timing Role: Robust solenoid interface with battery-supplied charge pump and thermal monitoring-operates reliably across wide ambient ranges (−40 °C to +135 °C).

Use Value: Integrated VBATP overvoltage diagnosis and junction temperature sensing prevent OCV failure during cold cranking or high-load conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel automotive solenoid driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TI DRV3245Q1RHFQ1	4-channel, 2.5 A max, no integrated charge pump; requires external high-side gate driver; SPI with 8-bit CRC only.	Lacks redundant current sensing and ASIL-D certification; suitable for non-ASIL systems with lower current demand.	Choose when cost sensitivity outweighs ASIL-D compliance and external gate driver design is acceptable.
NXP MC33816APEKR2	6-channel, 1.2 A max, integrated charge pump, but only 10-bit current resolution and no dither function.	Supports more channels but offers coarser current control and no programmable dither-limits precision in high-linearity valve applications.	Prefer for multi-solenoid systems where channel count >4 matters more than sub-mA resolution or hysteresis reduction.

Compared with DRV3245Q1RHFQ1 and MC33816APEKR2, the L9305EP-TR uniquely combines ASIL-D readiness, 13-bit current resolution, dither modulation, and dual-path current sensing-making it the only option certified for safety-critical transmission and ESC valve control where fault tolerance and microamp-level accuracy are mandatory.

Availability

L9305EP-TR is available at Aetrix Electronics and suitable for automatic transmission control units, electronic stability control modules, and active suspension ECUs requiring stable component supply, long-term automotive lifecycle support, and traceable AEC-Q100 sourcing.

Supply support for L9305EP-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 headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and power applications with vertical integration from R&D to wafer fabrication.

The L9305 belongs to ST's automotive power driver product line, engineered specifically for ASIL-D compliant solenoid and valve actuation in transmission, chassis, and engine control systems-emphasizing functional safety, thermal resilience, and diagnostic completeness.

FAQ

What is the maximum continuous current per channel for L9305EP-TR?

The L9305EP-TR supports up to 2 A per channel in extended range mode with ±4% accuracy from 0.5 A to 2 A. Thermal derating applies above 135 °C ambient; full 2 A operation is guaranteed up to T_j = 175 °C with proper PCB heatsinking on the exposed PowerSSO-36 pad.

How does the fail-safe pre-driver interface work with external FETs?

The FS_Dx, FS_Sx, and FS_Gx pins form a three-terminal interface to an external N-channel MOSFET used as a hardware-level shutdown switch. FS_D and FS_S monitor V_DS across the FET to detect short/open faults, while FS_G drives the gate-enabling redundant, autonomous cutoff independent of SPI or MCU failure.

Can L9305EP-TR operate in both hardware and software control modes?

Yes: in Hardware Mode, INx_DISx pins act as channel enable/disable signals for closed-loop current control; in Software Mode, they accept PWM inputs to directly drive the output transistors-allowing flexible integration with legacy MCU firmware or advanced model-predictive control algorithms.

Is the L9305EP-TR pin-compatible with the TQFP48 version (L9305QFP-TR)?

No-PowerSSO-36 (L9305EP-TR) and TQFP48 (L9305QFP-TR) have different pin counts, layouts, and signal allocations. The TQFP48 adds dedicated FS pins for all four channels (FS_D1–FS_D3, etc.) and NC pins, while PowerSSO-36 consolidates FS interfaces and omits some diagnostic pins. PCB redesign is required for migration.

L9305EP-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: *

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Topology:: -

Number of Outputs:: -

Frequency - Switching:: -

Voltage/Current - Output 1:: -

Voltage/Current - Output 2:: -

Voltage/Current - Output 3:: -

w/LED Driver:: -

w/Supervisor:: -

w/Sequencer:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

L9305EP-TR FAQ

1.How can I place an order for L9305EP-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9305EP-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 L9305EP-TR reliable?

The price and inventory of L9305EP-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9305EP-TR is usually 5 days.

3.What payment methods are accepted for L9305EP-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9305EP-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9305EP-TR?

L9305EP-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9305EP-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 L9305EP-TR?

For technical support, including L9305EP-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9305EP-TR requirements.

6.How does Aetrix verify that L9305EP-TR is sourced from the original manufacturer or authorized distributors?

All L9305EP-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 L9305EP-TR meets industry standards.

7.What is the process for return or replacement of L9305EP-TR?

All L9305EP-TR units undergo pre-shipment inspection (PSI). If there is an issue with L9305EP-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 L9305EP-TR part is unused and in its original packaging.

Return procedure for L9305EP-TR:

1.Submit a request within 90 days.

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

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