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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

STMicroelectronics L9958SBTR

Name: L9958SBTR
Brand: STMicroelectronics
SKU: L9958SBTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9958SBTR

Manufacturer:: STMicroelectronics

Category:: Motor Drivers, Controllers

Package:: 16-PowerBSOP (0.370", 9.40mm Width)

Datasheet:: L9958SBTR.pdf

Description:: IC MTRDRV BIPLR 4.5-5.5V 16PWRSO

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Product details

Overview

L9958SBTR from STMicroelectronics is an SPI-controlled H-bridge IC designed for DC and stepper motor control in safety-critical automotive and industrial applications. It operates from 4.0 V to 28 V battery supply, features programmable current regulation up to 8.6 A (typ.), integrated freewheeling MOSFETs, and full diagnostic reporting via 16-bit SPI. Used in electric power steering, HVAC actuators, and seat/mirror positioners.

For engineers reviewing the L9958SBTR datasheet, L9958SBTR pinout, L9958SBTR application, or L9958SBTR equivalent, key selection criteria include its 20 kHz PWM capability, tri-state fault response, open-load detection in ON state, thermal warning bit, and daisy-chain SPI support for multi-axis motor control systems.

Technical Context

The L9958SBTR implements a dual-channel N-channel H-bridge with integrated charge pump and active low-side freewheeling-switching the low-side MOSFET on during recirculation to reduce conduction loss versus passive diode operation. Its SPI interface supports 16-bit register reads/writes for real-time configuration of current limit threshold, slew rate, and diagnostics enablement.

Protection architecture includes independent Vs and Vdd undervoltage lockout, Vdd overvoltage detection, overtemperature shutdown with thermal warning bit, and per-channel short-to-battery/short-to-ground detection. All faults force outputs into high-impedance state while preserving SPI accessibility for root-cause diagnosis.

Key Specifications

Parameter	Value and Actual Design Meaning
Battery Supply Range	4.0 V to 28 V - supports 12 V and 24 V automotive systems with 40 V absolute max tolerance on VS and output pins.
Current Regulation Threshold	2.5 A to 8.6 A (typ.) - programmable in 4 steps via SPI; ±10% accuracy across -40 °C to 150 °C using 1% external R_EXT.
Full-Path R_ON	100 mΩ (T_j = -40 °C) to 300 mΩ (T_j = 150 °C) - defines worst-case conduction loss and thermal derating envelope.
PWM Frequency Support	Up to 20 kHz - enables smooth motor control without audible noise and supports standard automotive PWM timing requirements.
SPI Interface	16-bit slave interface with daisy-chain capability - allows synchronized configuration and diagnostics across multiple H-bridges using single MCU SPI bus.
Diagnostic Coverage	Short-to-battery, short-to-ground, overload, open-load (ON state), off-state open-load, overtemperature - all reported via dedicated SPI status bits.
Standby Current	<10 μA - enables ultra-low-power sleep mode for battery-backed modules requiring extended idle periods.

Pinout & Package

L9958SBTR is packaged in PowerSO16 - a JEDEC-standard medium-power SO package with exposed thermal slug soldered to PCB ground for enhanced thermal dissipation. Pin count: 16. Mounting: surface-mount. Thermal resistance (R_thJA): 45 °C/W (typ.).

Pin / Terminal	Circuit Role	Design Meaning
1 GND	Logic Ground Reference	Reference node for digital logic and SPI interface; must be connected to system ground plane.
2 SO	SPI Serial Output	Master-read data line; supports daisy-chain output to next device's SI pin.
3 CS	SPI Chip Select	Active-low enable for SPI communication; tied low to activate this device's SPI interface.
4 CP	Charge Pump Supply	Provides gate drive voltage for high-side N-MOSFETs; requires local 100 nF decoupling to GND.
5 DIR	Direction Control Input	Configures forward/reverse bridge state; internally pulled down; TTL/CMOS-compatible (3.3 V/5 V).
6 OUT1	H-Bridge Output 1	High-current switched node; connects to one terminal of DC or bipolar stepper motor winding.
7 DI	Disable Input	High-active tristate override; forces both outputs to high-Z regardless of DIR/PWM state.
8 PGND	Power Ground	High-current return path for motor current; must be routed separately from logic GND and joined near IC slug.
9 EN	Enable Input	High-active bridge activation; internally pulled down; complements DI for safe startup/shutdown sequencing.
10 OUT2	H-Bridge Output 2	Second high-current switched node; completes H-bridge topology with OUT1 for bidirectional drive.
11 PWM	Pulse Width Modulation Input	Controls current ramp-up/down in active states; determines torque/speed in closed-loop motor control.
12 REXT	External Current Sense Resistor	Connects to precision 1% resistor setting current regulation threshold; defines analog reference for internal comparator.
13 VS	Battery Supply Input	Main motor power rail input; withstands 40 V transient; monitored for undervoltage lockout at ~4.0 V.
14 SI	SPI Serial Input	Master-transmitted data line; accepts 16-bit commands and configuration words.
15 SCK	SPI Clock Input	Drives synchronous data transfer; max frequency 1 MHz per datasheet timing specs.
16 VDD	Logic Supply Voltage	Provides 4.5–5.5 V power for internal logic, SPI, and protection circuitry; includes UV/OV detection.

Key Features

Feature	Design Value
Programmable Current Limit	Set via SPI from 2.5 A to 8.6 A in 4 discrete steps - enables one BOM for multiple motor torque classes.
Active Low-Side Freewheeling	Switches low-side MOSFET on during recirculation - reduces power dissipation by ~30% vs. passive diode freewheeling.
Daisy-Chain SPI	Unlimited device chaining with single CS/SCK/SI lines - simplifies wiring and reduces MCU GPIO count in multi-axis systems.
Open-Load Detection (ON State)	Validates motor connection integrity while driving - prevents runaway conditions in safety-critical positioning applications.
Thermal Warning Bit	Asserted via SPI before overtemperature shutdown - enables predictive thermal management and graceful torque reduction.
Voltage Slew-Rate Control	Programmable via SPI to minimize EMI during switching transitions - critical for automotive EMC compliance (CISPR 25 Class 5).

Applications

Electric Power Steering (EPS)

HVAC Actuator Control

Use Scenario: Precise bidirectional torque assist for rack-and-pinion steering column.

IC Role / Device Role / Timing Role: H-bridge driver controlling 12 V brushed DC assist motor; receives PWM/DIR commands from EPS ECU at 20 kHz.

Use Value: Integrated diagnostics detect open-load or short-circuit faults before loss of steering assist, meeting ASIL-B functional safety requirements.

Use Scenario: Positioning of blend air doors in vehicle climate control system.

IC Role / Device Role / Timing Role: Low-power H-bridge driving small 24 V DC damper motor; operates intermittently with <10 μA standby current between cycles.

Use Value: Open-load detection confirms actuator linkage integrity during power-on self-test, preventing erroneous temperature zone errors.

Automotive Seat/Mirror Positioning

Industrial Linear Actuators

Use Scenario: Multi-directional adjustment of driver seat backrest and lumbar support.

IC Role / Device Role / Timing Role: Dual H-bridge channel (shared SPI bus) controlling two 12 V DC motors; enabled via EN/DI for fail-safe shutdown.

Use Value: Daisy-chain SPI allows coordinated motion of multiple axes using single MCU interface, reducing wiring harness complexity.

Use Scenario: Closed-loop positioning of valve stems or conveyor guides in factory automation.

IC Role / Device Role / Timing Role: Robust H-bridge operating from 24 V industrial supply; monitors VDD/Vs for brown-out resilience in noisy plant environments.

Use Value: Full diagnostic reporting via SPI enables remote fault logging and predictive maintenance without physical access to the actuator.

Equivalent & Alternatives

The following parts are listed as comparable options for similar H-bridge motor driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
VNQ7E100AJTR	Single-channel high-side driver (not H-bridge); 60 V abs max; no integrated current regulation or SPI diagnostics.	Used for unidirectional solenoid/valve control only; lacks bidirectional motor drive capability.	Select when only high-side switching is needed and diagnostics are handled externally.
DRV8876PWPR	Integrated H-bridge with 3.6–40 V supply; 3.6 A continuous; SPI-less; uses PWM/DIR only; no open-load detection.	Targeted at cost-sensitive consumer robotics; lacks ASIL-ready diagnostics and thermal warning bit.	Select for non-safety-critical 24 V DC motor control where SPI configurability and fault traceability are not required.

Compared with VNQ7E100AJTR and DRV8876PWPR, L9958SBTR uniquely delivers bidirectional SPI-configurable current limiting, ON-state open-load detection, and daisy-chain diagnostics - making it the only option qualified for ASIL-B automotive body control modules requiring field-upgradable fault response behavior.

Availability

L9958SBTR is available at Aetrix Electronics and suitable for electric power steering, HVAC actuators, seat/mirror positioning, and industrial linear actuators requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.

Supply support for L9958SBTR 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, industrial, and power management ICs with broad manufacturing and quality certifications including IATF 16949.

L9958SBTR belongs to ST's L99 family of safety-oriented motor drivers, engineered specifically for ASIL-B compliant automotive body electronics where robust diagnostics, thermal resilience, and supply voltage flexibility are mandatory.

FAQ

What is the maximum allowable voltage on the VS pin?

The VS pin withstands up to 40 V DC continuously per absolute maximum ratings. Operation is guaranteed from 4.0 V to 28 V, with undervoltage lockout activating below ~4.0 V and overvoltage protection absent on VS - external TVS is recommended for load-dump transients exceeding 35 V.

Does L9958SBTR support 3.3 V microcontrollers directly?

Yes. All digital inputs (EN, DI, DIR, PWM, CS, SCK, SI) and outputs (SO) are TTL/CMOS-compatible and operate with 3.3 V or 5 V logic levels. VDDIO pin (Pin 3 in PowerSO-20, not present in PowerSO16) is omitted in L9958SBTR's PowerSO16 variant, so VDD (4.5–5.5 V) supplies internal level-shifting - no external level shifter needed.

How does open-load detection work in ON state?

During active drive, the IC measures current through the external R_EXT and compares it against the programmed threshold. If measured current falls below 10% of threshold while DIR/PWM indicate ON state, "open-load" flag is set in the diagnostic register - confirming broken motor winding or disconnected cable without requiring external sense resistors.

Can multiple L9958SBTR devices share one SPI bus?

Yes - via daisy-chain topology. Connect SO of Device 1 to SI of Device 2, and so on; use common CS, SCK, and SI (to first device). Each device shifts out its 16-bit diagnostic word after receiving its 16-bit command, enabling synchronized readback of up to 16+ devices with one SPI transaction.

L9958SBTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-PowerBSOP (0.370", 9.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Motor Type - Stepper:: Bipolar

Motor Type - AC, DC:: Brushed DC

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

Output Configuration:: Half Bridge (2)

Interface:: SPI

Technology:: CMOS

Step Resolution:: -

Applications:: General Purpose

Current - Output:: 8.6A

Voltage - Supply:: 4.5V ~ 5.5V

Voltage - Load:: 4V ~ 28V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSO-16™

L9958SBTR FAQ

1.How can I place an order for L9958SBTR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9958SBTR 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 L9958SBTR reliable?

The price and inventory of L9958SBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9958SBTR is usually 5 days.

3.What payment methods are accepted for L9958SBTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9958SBTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9958SBTR?

L9958SBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9958SBTR 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 L9958SBTR?

For technical support, including L9958SBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9958SBTR requirements.

6.How does Aetrix verify that L9958SBTR is sourced from the original manufacturer or authorized distributors?

All L9958SBTR 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 L9958SBTR meets industry standards.

7.What is the process for return or replacement of L9958SBTR?

All L9958SBTR units undergo pre-shipment inspection (PSI). If there is an issue with L9958SBTR, 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 L9958SBTR part is unused and in its original packaging.

Return procedure for L9958SBTR:

1.Submit a request within 90 days.

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

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