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) > Motor Drivers, Controllers

STMicroelectronics L9947S

Name: L9947S
Brand: STMicroelectronics
SKU: L9947S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: L9947S

Manufacturer:: STMicroelectronics

Category:: Motor Drivers, Controllers

Package:: Multiwatt-15 (Vertical, Bent and Staggered Leads)

Datasheet:: L9947S.pdf

Description:: IC MTR DRVR 4.5-5.5V 15MULTIWATT

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,392

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

Product details

Overview

L9947S from STMicroelectronics is a quad half-bridge and single high-side driver IC for automotive power interface applications, implemented in Multipower BCD60II technology. It integrates four half-bridge outputs (two rated for 3A/0.25Ω R_DS(on), two for 0.5A/2.5Ω R_DS(on)) and one high-side driver (2.5A/0.45Ω R_DS(on)), with <100µA standby current at room temperature and full diagnostic capability (overcurrent, overtemperature, open-load, overvoltage) via a µC-compatible 4-bit parallel bus.

For engineers reviewing the L9947S datasheet, L9947S pinout, L9947S application, or L9947S equivalent, this device supports multiplexed control of up to three DC motors and one grounded resistive load in body electronics systems-requiring precise current limiting, thermal protection, and bidirectional diagnostic feedback without external sensing components.

Technical Context

The L9947S operates as a slave device on a microcontroller-controlled parallel bus (D0–D3, CSN, R/WN, MODE), supporting write (status commands 1–20), read (diagnostic status 11–15), and diagnostic test modes (16–18). Its internal oscillator runs at 250 kHz, enabling bus timing with t₁ = 20–90 µs CSN low pulse width and t₇ = 300 µs output activation delay at V_S = 13 V.

All five power outputs feature independent current limiting and thermal shutdown (T_JSD = 150°C, hysteresis = 20 K). Overcurrent detection triggers automatic switch-off within 50 µs, while open-load diagnosis uses controlled 10–140 mA test currents across OUT1–OUT5 to distinguish broken wires from shorted loads under hysteresis voltage thresholds (0.4V_S/0.6V_S).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Current (Standby)	<100 µA at T_j ≤ 25°C; enables always-on body control modules without battery drain
Output Configuration	4 half-bridges + 1 high-side driver; supports full-bridge motor control (M1–M3) plus independent resistive load drive
R_DS(on) (OUT3/OUT4)	395 mΩ max at V_S >10 V, T_j = 125°C; ensures low conduction loss for 3A motor phases
Current Limit (OUT3/OUT4)	4–12 A; hardware-enforced foldback protects against sustained short-circuit faults
Diagnostic Coverage	Real-time reporting of overtemperature (OT), overvoltage (OVV), overcurrent (OVC1/OVC2), and open-load (OUTX) via D0–D3 bus
Thermal Shutdown	Triggers at T_j ≥ 150°C; resumes operation only after T_j drops to ≤130°C (20 K hysteresis)
Bus Interface	4-bit bidirectional parallel bus with CSN/R/WN/MODE control; no external clock required

Pinout & Package

Package: Multiwatt-15 (vertical, 15-pin, through-hole), thermally enhanced with integrated heatsink tab (pin 15). Pin pitch: 2.54 mm; body width: 17.78 mm; height: 22.2 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (VS)	Main power supply input	Accepts 8–26 V DC; internal overvoltage shutdown activates at 20 V (typ.)
2 (GND)	Power ground reference	Common return for all power outputs and internal logic; isolated from signal ground
3 (VCC)	Stabilized 5 V logic supply	Must be supplied externally (4.5–5.5 V); powers bus interface and diagnostics
4 (CSN)	Chip select (active-low)	Enables bus communication; internal pull-down resistor (20 kΩ) ensures safe default state
5 (R/WN)	Read/write control	Low = write mode (accept command); high = read mode (output diagnostic bits)
6 (MODE)	Bus mode selector	Defines D0–D3 function: 0 = data input, 1 = diagnostic output
7–10 (D0–D3)	Bidirectional data bus	4-bit parallel interface; direction determined by MODE and R/WN states
11–14 (OUT1–OUT4)	Half-bridge outputs	Each provides source/sink capability; OUT1/OUT2: 0.5A; OUT3/OUT4: 3A
15 (OUT5)	High-side driver output	Sinks up to 2.5A to ground; enabled only when all half-bridges are in tristate

Key Features

Feature	Design Value
Integrated diagnostic engine	Reports overtemperature, overvoltage, overcurrent (per-output), and open-load status via same 4-bit bus-no external ADC or fault monitoring circuitry needed
Multiplexed motor control	Supports time-division driving of three independent DC motors using shared D0–D3 lines-reducing MCU GPIO count and wiring complexity
Self-clearing fault recovery	Overcurrent events auto-clear on next valid command; thermal shutdown releases automatically after cooldown-no software reset required
Robust open-load detection	Uses programmable 10 mA sink (OUT1–OUT3) and 140 mA source (OUT4) test currents to eliminate false positives from contact oxidation or leakage paths
Fail-safe startup behavior	Enters standby mode if CSN held low >100 µs after VCC rise; prevents unintended output activation during power sequencing

Applications

Power Window Control

Seat Position Adjustment

Use Scenario: Bidirectional actuation of brushed DC motors in automotive door modules for window lift/drop functions.

IC Role / Device Role / Timing Role: Quad half-bridge driver executing full-bridge commutation sequences (e.g., status 3/4 for M1 right/left) with braking (status 9) to suppress flyback voltage.

Use Value: Eliminates need for discrete H-bridge MOSFETs and current-sense amplifiers; integrated OVC and OT protection prevents motor stall damage.

Use Scenario: Precise positioning of power seats using dual-motor systems (horizontal + vertical movement).

IC Role / Device Role / Timing Role: Time-multiplexed control of M2 and M3 via status 5/6 and 7/8; OUT5 drives seat heater resistive load independently.

Use Value: Reduces PCB area and BOM count by consolidating three motor drivers + heater control into single Multiwatt-15 package.

Roof Sunshade Actuation

Body Control Module Load Driving

Use Scenario: Smooth extension/retraction of panoramic sunroofs with soft-start and end-stop detection.

IC Role / Device Role / Timing Role: Half-bridge pair (OUT3/OUT4) delivers 3A peak current; open-load diagnostics (status 18) verify mechanical linkage integrity before motion.

Use Value: Prevents jamming-related gear damage via real-time current limiting and automatic brake insertion on fault detection.

Use Scenario: Centralized switching of non-motor loads including interior lighting, mirror heaters, and door lock solenoids.

IC Role / Device Role / Timing Role: High-side driver (OUT5) controls grounded resistive loads; half-bridges manage bidirectional solenoid coils.

Use Value: Enables single-chip replacement of multiple discrete power switches while maintaining ASIL-B compatible diagnostics.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad half-bridge + high-side driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
VNQ5E04K-E	Quad-channel high-side driver only (no half-bridges); 0.4 Ω R_DS(on); SPI interface instead of parallel bus	Requires external H-bridges for motor control; better suited for pure load switching, not bidirectional actuation	Select when system already uses SPI infrastructure and only needs high-side switching with enhanced diagnostics
L9945	Triple half-bridge + dual high-side; 2.5A per half-bridge; identical Multiwatt-15 package and pinout compatibility	Supports fewer motors (2 vs. 3) but adds second high-side channel; lacks OUT4 open-load test current capability	Choose for designs needing redundant high-side control or where OUT4 diagnostic is non-critical

Compared with VNQ5E04K-E, L9947S integrates motor-driving capability without external bridges; versus L9945, it trades one high-side channel for extended open-load test functionality and third-motor support-making it optimal for cost-sensitive, space-constrained body electronics with mixed motor/resistive loads.

Availability

L9947S is available at Aetrix Electronics and suitable for automotive body control modules, power window systems, and seat adjustment mechanisms requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for L9947S 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, specializing in automotive-grade analog, power, and microcontroller solutions with ISO/TS 16949 certified manufacturing.

The L9947S belongs to ST's Automotive Power Switch family, designed specifically for intelligent, diagnostic-rich power distribution in vehicle body electronics-emphasizing functional safety, low quiescent current, and robust fault handling in harsh environments.

FAQ

What is the maximum junction temperature and thermal hysteresis for L9947S?

The L9947S triggers thermal shutdown at a junction temperature of 150°C (T_JSD) and resumes operation only after cooling to ≤130°C, providing a fixed 20 K hysteresis to prevent oscillation near trip point. This behavior is hard-coded in silicon and does not require configuration.

How does open-load diagnosis work on OUT1–OUT4?

Open-load diagnosis uses status 16–18 to inject controlled test currents: 140 mA source (OUT4, status 16), 140 mA sink (OUT4, status 17), or 10 mA sink per half-bridge (OUT1–OUT3, status 18). Voltage detection at 0.4V_S/0.6V_S thresholds then identifies open circuits versus shorts without external components.

Can OUT5 be activated simultaneously with any half-bridge output?

No. The L9947S enforces strict sequencing: OUT5 (high-side driver) is only enabled in status 10, which requires all half-bridges (OUT1–OUT4) to be in tristate. Attempting concurrent activation results in automatic disable of OUT5 and diagnostic flag setting.

What happens during VCC interruption while VS remains active?

If VCC is interrupted while VS is present, the L9947S enters undefined behavior unless D0–D3 are held low or undriven. In case one data pin is pulled high by the MCU, it may back-power VCC via internal p-channel diode-potentially causing spurious commands. ST recommends using external VCC supervision or ensuring D0–D3 are tri-stated during VCC loss.

L9947S Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: Multiwatt-15 (Vertical, Bent and Staggered Leads)

Packaging:: Bulk

Product Status:: Obsolete

Motor Type - Stepper:: -

Motor Type - AC, DC:: Brushed DC

Function:: Driver - Fully Integrated, Control and Power Stage

Output Configuration:: Half Bridge (4), High Side (1)

Interface:: -

Technology:: DMOS

Step Resolution:: -

Applications:: -

Current - Output:: -

Voltage - Supply:: 4.5V ~ 5.5V

Voltage - Load:: 8V ~ 16V

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 15-Multiwatt

L9947S FAQ

1.How can I place an order for L9947S through Aetrix?

Please submit a Request for Quotation (RFQ) for L9947S 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 L9947S reliable?

The price and inventory of L9947S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9947S is usually 5 days.

3.What payment methods are accepted for L9947S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9947S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9947S?

L9947S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9947S 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 L9947S?

For technical support, including L9947S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9947S requirements.

6.How does Aetrix verify that L9947S is sourced from the original manufacturer or authorized distributors?

All L9947S 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 L9947S meets industry standards.

7.What is the process for return or replacement of L9947S?

All L9947S units undergo pre-shipment inspection (PSI). If there is an issue with L9947S, 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 L9947S part is unused and in its original packaging.

Return procedure for L9947S:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 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…

2026-09-01 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…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…