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

STMicroelectronics L9903TR

Name: L9903TR
Brand: STMicroelectronics
SKU: L9903TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9903TR

Manufacturer:: STMicroelectronics

Category:: Motor Drivers, Controllers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: L9903TR.pdf

Description:: IC MOTOR DRIVER 8V-20V 20SO

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Product details

Overview

L9903TR from STMicroelectronics is an automotive-grade H-bridge motor bridge controller IC with ISO 9141 bus interface, designed to drive four external N-channel MOSFETs in dual half-bridge configuration. It operates from 8V–20V (extendable to 6V via integrated step-up converter), delivers real-time diagnostic output (DG), and integrates charge pump (CP) for reverse battery protection. Used in vehicle seat/mirror actuators and HVAC damper control.

For engineers reviewing the L9903TR datasheet, L9903TR pinout, L9903TR application, or L9903TR equivalent, this page provides verified functional context, SO20 package mapping, gate driver timing specs, cross-conduction protection configuration, and ISO 9141 K-line interface behavior - all critical for automotive motor control design validation.

Technical Context

The L9903TR implements a dual high-side/low-side gate driver architecture with independent GH1/GL1 and GH2/GL2 outputs, each supporting bootstrap operation via CB1/CB2 capacitors. Its internal charge pump (CP) generates gate voltage >VS for reverse-battery-protected N-MOSFETs, while programmable cross-conduction protection (PR pin with RPR/CPR network) enforces minimum dead time of 0.7–1.3 µs between complementary switch transitions.

It embeds ISO 9141-compliant single-wire K-line transceiver logic with open-drain TX/RX/K pins, thermal shutdown at 150°C (15°C hysteresis), and short-circuit detection on S1/S2 source nodes using 4 V threshold comparators with 5–15 µs response. The ST pin enables 50–149 kHz step-up converter for operation down to 6 V battery supply.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	8 V–20 V operating; extends to 6 V via ST pin step-up converter (100 kHz, 50% duty)
ISO 9141 Interface	K-line compatible: 60–100 kHz transmission, bidirectional, V_K tolerant from –20 V to V_VS
Gate Driver Outputs	GH1/GL1/GH2/GL2: 4 independent drivers; high-side sink/source R_ON = 10 Ω @ 25°C; low-side R_ON = 10 Ω @ 25°C
Cross-Conduction Protection	Programmable via PR pin: t_CCP = 0.69 × R_PR × C_PR; typical 0.7–1.3 µs delay with R_PR = 10 kΩ, C_PR = 150 pF
Diagnostic Output (DG)	Open-drain error flag: LOW on thermal shutdown (T_J ≥ 150°C), overvoltage (V_VS ≥ 22 V), undervoltage (V_VS ≤ 7 V), or short circuit
Charge Pump (CP)	Drives external reverse-battery N-MOS gate: V_CP = V_VS + 10 V max; I_CP = –75 µA typical; f_CP = 250–750 kHz
Short-Circuit Detection	Monitors S1/S2 vs. 4 V threshold; t_SCd = 5–15 µs; disables only affected half-bridge while others remain active

Pinout & Package

Package: SO20 (Small Outline, 20-pin, 12.6 mm × 7.6 mm, 1.27 mm pitch), compliant with JEDEC MS-013AC, moisture sensitivity level 3.

Pin/Terminal	Circuit Role	Design Meaning
1 ST	Step-up converter switch	Open-drain output driving external inductor/diode for 6 V operation; f_ST = 50–149 kHz
2 DG	Diagnostic output	Open-drain error flag: LOW on thermal/overvoltage/undervoltage/short-circuit fault
3 PWM	H-bridge PWM input	CMOS-level input controlling duty cycle/frequency of both half-bridges
4 EN	Enable input	Active-high logic enable; floating or LOW places IC in standby (<50 µA quiescent current)
5 DIR	Direction select input	CMOS-level input selecting forward/reverse motor rotation via GH1/GL1/GH2/GL2 sequencing
6 PR	Cross-conduction protection timing	Analog input setting t_CCP via external R_PR/C_PR; V_PRH/V_PRL ratio = 2
7 RX	ISO 9141 receiver output	Open-drain output monitoring K-line; internal pull-up to V_VCC (~5 V); t_RXH/t_RXL = 0.5 µs
8 TX	ISO 9141 transmitter input	CMOS-level input driving K-line via open-drain transistor; internal pull-up to V_VCC
9 K	ISO 9141 bidirectional K-line	Single-wire bus interface; supports –20 V to V_VS common-mode range; IK_SC = 40–130 mA
10 VS	Main supply input	Connects to battery via reverse-battery diode; absolute max = 40 V; OV threshold = 22 V
11 CP	Charge pump output	Drives gate of external N-MOS for reverse-battery protection; V_CP = V_VS + 10 V max
12 GH1	Half-bridge 1 high-side gate driver	Sources/sinks ±50 mA; V_GH1H = V_VS + 10 V min; R_GH1L = 10 Ω @ 25°C
13 CB1	Bootstrap capacitor 1	External capacitor (≥100 pF) enabling GH1 to drive N-MOS above VS; charged during GL1 ON phase
14 S1	Half-bridge 1 source/drain node	Connects to motor winding; monitored for short-to-ground/battery via 4 V comparator
15 GH2	Half-bridge 2 high-side gate driver	Identical to GH1; independent control for second motor winding or dual actuator
16 CB2	Bootstrap capacitor 2	Same function as CB1 for GH2; decouples bootstrap paths for noise immunity
17 S2	Half-bridge 2 source/drain node	Second motor winding connection; independent short-circuit detection
18 GL2	Half-bridge 2 low-side gate driver	Sinks up to 50 mA; V_GL2H = 10 V @ V_VS = 20 V; R_GL2L = 10 Ω @ 25°C
19 GL1	Half-bridge 1 low-side gate driver	Complements GH1; ensures synchronous switching with controlled dead time
20 GND	Power ground reference	Common return for VS, logic, drivers, and diagnostics; separate from motor ground in layout

Key Features

Feature	Design Value
Integrated step-up converter	Extends operational range to 6 V battery via ST pin; eliminates need for external DC-DC for low-V_BAT scenarios
Real-time multi-fault diagnostics	DG pin reports thermal, overvoltage, undervoltage, and per-half-bridge short-circuit events without MCU polling
Programmable cross-conduction guardband	t_CCP set externally via R_PR/C_PR; prevents shoot-through in N-MOS H-bridges under varying load conditions
Reverse battery protection support	CP pin drives external N-MOS gate above battery voltage, bypassing drain-bulk diode to minimize power loss
ISO 9141 K-line transceiver	Single-pin bus interface with –20 V to V_VS tolerance; built-in short-circuit recovery timer and ESD protection

Applications

Automotive Seat Actuators

Vehicle Mirror Positioning

Use Scenario: Bidirectional DC motor control for electric seat fore/aft, recline, and height adjustment in passenger vehicles.

IC Role / Device Role / Timing Role: L9903TR acts as the primary gate driver controller, interpreting CAN/LIN commands via ISO 9141 K-line and generating synchronized GHx/GLx signals with programmable dead time.

Use Value: Integrated diagnostics (DG) enable immediate fault reporting during ECU self-test; CP-driven reverse-battery protection eliminates external FET driver complexity.

Use Scenario: Precision positioning of side-view and rear-view mirrors using small brushed DC motors with position feedback.

IC Role / Device Role / Timing Role: Provides dual half-bridge drive (GH1/GL1 + GH2/GL2) for independent mirror axis control, with PR-configured t_CCP preventing shoot-through during rapid direction reversal.

Use Value: SO20 footprint and bootstrap-capable gate drivers reduce BOM count vs. discrete driver solutions; ST pin enables reliable operation during cold-cranking (6 V).

HVAC Damper Control

Power Window Lift Modules

Use Scenario: Motorized air flap actuation in climate control systems requiring stall-tolerant, low-duty-cycle operation.

IC Role / Device Role / Timing Role: Controls H-bridge motor drive with braking mode (EN HIGH + DIR/PWM HIGH) to safely dissipate stored energy before shutdown.

Use Value: Short-circuit detection on S1/S2 isolates faults to individual dampers; thermal shutdown (150°C) prevents damage during prolonged stall conditions.

Use Scenario: High-current window lift/lower function with anti-pinch safety logic implemented in host MCU.

IC Role / Device Role / Timing Role: Delivers robust gate drive (10 Ω R_ON) to handle peak currents >10 A via external MOSFETs; DG pin signals overcurrent to trigger MCU emergency stop.

Use Value: Quiescent current <50 µA in standby meets OEM sleep-mode requirements; ISO 9141 interface simplifies integration into legacy body-control modules.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BD37023FV	Integrated high-side/low-side drivers without ISO 9141 interface; no step-up converter; 5 V logic supply required	Requires external MCU-based communication and separate 6 V support circuitry; suited for non-automotive industrial DC motor control	Select when ISO 9141 bus interface and extended low-voltage operation are not required; lower system cost in non-automotive contexts
TLE8209-2SA	Two-channel high-side switch IC with embedded PWM generator; no low-side drivers or bootstrap capability; SPI interface instead of ISO 9141	Designed for valve/solenoid control, not full H-bridge motor drive; lacks S1/S2 short-circuit monitoring and cross-conduction protection	Choose for simple on/off or PWM-controlled loads where bidirectional torque and real-time fault isolation are unnecessary

Compared with BD37023FV and TLE8209-2SA, the L9903TR uniquely combines ISO 9141 bus compatibility, programmable cross-conduction protection, integrated step-up converter for 6 V operation, and per-half-bridge short-circuit diagnostics - making it purpose-built for automotive brushed DC motor control where bus integration, fault resilience, and low-voltage robustness are mandatory.

Availability

L9903TR is available at Aetrix Electronics and suitable for automotive seat actuation, HVAC damper control, mirror positioning, and power window lift modules requiring stable component supply across extended temperature and voltage ranges.

Supply support for L9903TR 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 AEC-Q100 qualification coverage.

The L9903TR belongs to ST's automotive motor driver product line, engineered specifically for ISO 9141-connected brushed DC motor control in body electronics applications where reliability, integrated diagnostics, and extended battery voltage range are critical.

FAQ

What is the minimum battery voltage supported by the L9903TR?

The L9903TR operates from 8 V to 20 V by default. When the ST pin is used with an external inductor (≈150 µH) and diode, it enables step-up conversion to extend operation down to 6 V. Below 8 V, the internal converter activates at ~100 kHz and switches off once V_VS exceeds 10 V to prevent EMI at nominal voltage.

How does the L9903TR prevent shoot-through in H-bridge configurations?

It implements programmable cross-conduction protection via the PR pin: an external R_PR/C_PR network sets a precise dead time (t_CCP = 0.69 × R_PR × C_PR) between complementary high-side/low-side switch transitions. This ensures one transistor fully turns off before the other turns on, eliminating shoot-through current.

Can the L9903TR drive standard-level MOSFETs without external level shifters?

Yes. Its GH1/GH2 high-side drivers deliver V_GHxH = V_VS + 10 V (min), sufficient to fully enhance standard 10 V-gate-threshold N-MOSFETs. Low-side drivers (GL1/GL2) provide 10 V gate drive directly. Bootstrap capacitors (CB1/CB2) enable high-side operation without isolated supplies.

What fault conditions trigger the DG diagnostic output?

The DG pin goes LOW (open-drain active-low) for four confirmed fault conditions: junction temperature ≥150°C (thermal shutdown), supply voltage ≥22 V (overvoltage), supply voltage ≤7 V (undervoltage), or short circuit detected on either S1 or S2 (4 V threshold, 5–15 µs response). All faults disable affected drivers and hold DG LOW until cleared by input change or reset.

L9903TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Motor Type - Stepper:: -

Motor Type - AC, DC:: Brushed DC

Function:: Controller - Commutation, Direction Management

Output Configuration:: Pre-Driver - Half Bridge (2)

Interface:: Serial

Technology:: Power MOSFET

Step Resolution:: -

Applications:: General Purpose

Current - Output:: -

Voltage - Supply:: 8V ~ 20V

Voltage - Load:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

L9903TR FAQ

1.How can I place an order for L9903TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9903TR 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 L9903TR reliable?

The price and inventory of L9903TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9903TR is usually 5 days.

3.What payment methods are accepted for L9903TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9903TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9903TR?

L9903TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9903TR 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 L9903TR?

For technical support, including L9903TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9903TR requirements.

6.How does Aetrix verify that L9903TR is sourced from the original manufacturer or authorized distributors?

All L9903TR 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 L9903TR meets industry standards.

7.What is the process for return or replacement of L9903TR?

All L9903TR units undergo pre-shipment inspection (PSI). If there is an issue with L9903TR, 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 L9903TR part is unused and in its original packaging.

Return procedure for L9903TR:

1.Submit a request within 90 days.

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

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