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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

STMicroelectronics L9177TR

Name: L9177TR
Brand: STMicroelectronics
SKU: L9177TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9177TR

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

Package:: 46-PowerBFSOP (0.433", 11.00mm Width)

Datasheet:: L9177TR.pdf

Description:: IC PTS SMARTPOWER

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L9177TR from STMicroelectronics is a fully integrated power and signal peripheral IC for low-end 2-cylinder internal combustion engine control, featuring dual injector drivers (60 V clamped, 2.8 A overcurrent threshold), O₂ sensor heater driver (3 A, 45 V clamped), stepper motor driver (500 mA full-step), and K-line transceiver (ISO-9141 compliant). It delivers three regulated 5 V supplies (300 mA main, 40 mA tracking, 2.5 mA standby) and supports SPI-based diagnostics and configuration in automotive-grade PowerSO46 packaging.

For engineers reviewing the L9177TR datasheet, L9177TR pinout, L9177TR application, or L9177TR equivalent, this device serves as a system-level peripheral hub for motorcycle, K-car, and marine engine ECU designs-requiring precise low-side driver diagnosis, variable reluctance sensor interface auto-adaptation, thermal shutdown coordination, and serial/parallel output control modes.

Technical Context

The L9177TR integrates parallel- and SPI-controllable low-side drivers with internal 60 V (injectors) and 45 V (relays, lamp, O₂ heater, tachometer) clamp protection, plus dedicated high-side switching (100 mA current limit). Its self-configuring variable reluctance sensor (VRS) interface implements auto-adaptive hysteresis and time filtering to reliably decode crankshaft position signals across speed and temperature variations.

All drivers-including stepper motor (diagonal R_on ≤ 2.6 Ω at T_j = 150 °C), lamp (2 A in-rush), and relay (1 A guaranteed) -support full SPI-based diagnosis (OL, STG, OC, STB) and operate within a 3.9–18 V supply range, with thermal shutdown and over/under-voltage protection coordinated across regulators and outputs.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage range	6 V to 18 V; basic functionality maintained down to 3.9 V for cold-crank robustness
Main 5 V regulator	300 mA output with thermal shutdown and current limiting for MCU/core logic supply
Injector driver R_on	≤ 0.6 Ω worst-case at T_j = 150 °C, enabling <1.7 W conduction loss at 2.8 A
O₂ heater driver	3 A minimum guaranteed output with 45 V clamp and 0.5 Ω worst-case R_on at 150 °C
SPI interface	24-bit diagnostic and control interface supporting OL/STG/OC/STB fault reporting per channel
VRS interface	Self-configuring differential input with auto-adaptive hysteresis and time filter for crank/cam sensing
K-line transceiver	ISO-9141 compliant physical layer for ECU diagnostics and programming via vehicle bus

Pinout & Package

Packaged in PowerSO46-a thermally enhanced, 46-pin exposed-pad package optimized for high-power automotive applications with low thermal resistance and robust mechanical mounting.

Pin/Terminal	Circuit Role	Design Meaning
OUTA / OUTB	Injector driver bridge outputs	High-current low-side outputs (60 V clamp); used in parallel or SPI-controlled mode
EN / DIR	Stepper motor control inputs	Enable and direction logic inputs for idle-speed control motor sequencing
VROUT	VRS interface output	Digital crank/cam position signal after adaptive hysteresis and filtering
O2H / INO2H	O₂ heater driver output and sense input	High-current output with current-sense feedback for closed-loop heater control
TACH / ILS_TACH	Tachometer driver output and input	25 mA min. output driving ignition coil primary; input monitors secondary pulse for RPM
HS_OUT	Protected high-side switch	100 mA current-limited output for auxiliary loads (e.g., fuel pump pre-priming)
VRIN+ / VRIN−	VRS differential sensor inputs	Accepts ±200 mV to ±2 V AC signals from magnetic pickup sensors without external conditioning

Key Features

Feature	Design Value
Multi-mode low-side drivers	Supports both parallel GPIO and SPI command control for injectors, relays, lamp, tach, and O₂ heater
Integrated diagnostics	Per-channel open-load, short-to-ground, overcurrent, and short-to-battery detection reported via SPI
Adaptive VRS interface	Auto-adjusts hysteresis and time filter thresholds based on signal amplitude and frequency-no calibration needed
Thermal coordination	Global overtemperature shutdown disables all regulators and drivers while preserving SPI accessibility for fault readout
K-line physical layer	Built-in ISO-9141 transceiver eliminates need for external line driver in ECU diagnostic interfaces

Applications

Motorcycle Engine Control Unit

K-Car Powertrain Module

Use Scenario: Real-time fuel injection and idle speed control for single- or twin-cylinder 50–250 cc engines.

IC Role / Device Role / Timing Role: Central peripheral IC providing injector drive, O₂ heater control, tach signal conditioning, and crank position decoding via VRS interface.

Use Value: Enables compact, cost-optimized ECU design with integrated diagnostics-reducing external components by >12 vs. discrete driver + regulator solutions.

Use Scenario: Low-cost engine management for urban microcars (<1 L displacement) requiring emissions compliance and fail-safe operation.

IC Role / Device Role / Timing Role: Supplies regulated 5 V rails, drives relays/lamp for actuator control, and manages stepper motor for throttle-by-wire idle actuation.

Use Value: Single-chip integration of safety-critical drivers and diagnostics meets ASIL-B functional safety requirements without external watchdog or monitoring ICs.

Marine Outboard Engine Controller

Small Generator ECU

Use Scenario: Harsh-environment engine control for 2–15 HP outboard motors exposed to salt, moisture, and wide ambient temperature swings.

IC Role / Device Role / Timing Role: Provides protected lamp driver for status indication, relay drivers for fuel solenoid and starter engagement, and K-line interface for service tool connectivity.

Use Value: 45–60 V clamp protection and thermal shutdown ensure reliable operation during battery transients and prolonged high-load conditions.

Use Scenario: Standby power generation systems (e.g., portable or backup gensets) requiring automatic start/stop, load sensing, and emissions control.

IC Role / Device Role / Timing Role: Manages O₂ sensor heater for closed-loop lambda control, tachometer for RPM regulation, and stepper motor for governor actuation.

Use Value: Integrated 5 V standby regulator (2.5 mA) enables ultra-low-power wake-on-event capability-extending battery life during generator idle periods.

Equivalent & Alternatives

The following parts are listed as comparable options for similar engine peripheral interface applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC33816	Single 5 V regulator (250 mA); no tracking or standby regulator; separate VRS interface required	Lacks integrated K-line and multi-rail regulation-requires companion ICs for full ECU functionality	Preferred when board space allows modular design and legacy MC33816 firmware reuse is prioritized
TPIC2603D	Standalone 8-channel low-side driver only; no regulators, VRS, K-line, or SPI diagnostics	Requires external 5 V supply, microcontroller, and communication interface-no system-level integration	Used where only high-channel-count driver capability is needed, and other functions are handled by separate ICs

Compared with MC33816 and TPIC2603D, the L9177TR reduces BOM count by integrating power regulation, sensor interface, diagnostics, and communication into one die-cutting PCB area by ~35% and eliminating inter-IC timing coordination overhead in engine control loops.

Availability

L9177TR is available at Aetrix Electronics and suitable for motorcycle ECU development, K-car powertrain modules, marine engine controllers, and small generator control systems requiring stable component supply, long-term automotive qualification, and production-ready diagnostics support.

Supply support for L9177TR 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 qualified product lines.

The L9177TR belongs to ST's "Automotive Power & Sensing" product family, designed specifically for cost-sensitive, low-cylinder-count engine control units where integration, diagnostic completeness, and environmental ruggedness are critical.

FAQ

What is the maximum operating junction temperature for the L9177TR?

The L9177TR is rated for continuous operation up to 150 °C junction temperature, with thermal shutdown activation at approximately 165 °C. All electrical parameters-including R_on, current limits, and regulator accuracy-are specified and guaranteed at this maximum T_j, validated per AEC-Q100 stress testing protocols.

Does the L9177TR support both parallel and serial control for all drivers?

No-only injector drivers, O₂ heater, and two relay drivers support both parallel and SPI control. The third relay driver, lamp driver, and tachometer driver are SPI-only. Stepper motor control uses dedicated EN/DIR pins, and the high-side switch is enabled via SPI register write only.

How does the VRS interface adapt to varying sensor signal amplitudes?

The VRS interface continuously monitors input signal peak-to-peak amplitude and automatically adjusts hysteresis voltage and time-filter cutoff frequency using internal current generators and comparator offsets-ensuring clean zero-crossing detection from 20 mV to 2 V without external trimming or software calibration.

Can the L9177TR be used without an external microcontroller?

No-the L9177TR has no embedded processor or flash memory. It requires an external MCU to configure registers, interpret SPI diagnostics, and coordinate timing-critical functions (e.g., injector pulse width). Its role is strictly peripheral power and signal conditioning-not autonomous engine control.

L9177TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 46-PowerBFSOP (0.433", 11.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: -

Current - Supply:: 20mA

Voltage - Supply:: 6V ~ 18V

Operating Temperature:: -40°C ~ 125°C

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSO-46

L9177TR FAQ

1.How can I place an order for L9177TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9177TR 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 L9177TR reliable?

The price and inventory of L9177TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9177TR is usually 5 days.

3.What payment methods are accepted for L9177TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9177TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9177TR?

L9177TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9177TR 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 L9177TR?

For technical support, including L9177TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9177TR requirements.

6.How does Aetrix verify that L9177TR is sourced from the original manufacturer or authorized distributors?

All L9177TR 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 L9177TR meets industry standards.

7.What is the process for return or replacement of L9177TR?

All L9177TR units undergo pre-shipment inspection (PSI). If there is an issue with L9177TR, 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 L9177TR part is unused and in its original packaging.

Return procedure for L9177TR:

1.Submit a request within 90 days.

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

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