L9942-TR - Automotive Dual-Channel Low-Side Driver | STMicroelectronics
Teilenummer: L9942-TR ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $2.85 | $2,85 |
| 10 | $2.56 | $25,60 |
| 100 | $2.28 | $228,00 |
| 500 | $2.05 | $1.025,00 |
| 1.000 | $1.82 | $1.820,00 |
L9942-TR Übersicht
A low-side driver is a type of power switch that connects the load to ground when activated, allowing the microcontroller to control high-current loads with minimal logic-level drive. In the hierarchy of power management, a low-side driver falls under the category of power switches, which are essential components in automotive body control modules, industrial automation, and smart lighting systems. The L9942-TR specifically provides the interface between low-voltage logic and high-power loads, ensuring safe and efficient switching.
Key features of the L9942-TR include its SPI interface for advanced diagnostics and configuration, a wide operating voltage range, and a low quiescent current of 50uA in standby mode. The device also features a 16-bit SPI protocol for reading fault status and controlling the output channels, making it suitable for complex automotive networks. Its thermal shutdown and overcurrent protection ensure reliable operation in harsh environments, while the exposed pad package enhances thermal dissipation.
Technically, the L9942-TR is fabricated using STMicroelectronics' BCD (Bipolar-CMOS-DMOS) technology, which combines the benefits of bipolar, CMOS, and DMOS transistors to achieve high efficiency and robustness. The device includes a charge pump for gate driving, enabling low-side switching with minimal external components. The SPI interface operates at up to 5MHz, allowing fast communication with the host microcontroller, and the device supports daisy-chaining for multiple drivers on a single bus.
Typical applications include automotive body control modules for controlling exterior lights, wipers, and relays, as well as industrial PLCs for driving solenoids and valves. The L9942-TR is also used in LED lighting systems for automotive and general lighting, where its current-sensing capability enables precise brightness control. Its wide input voltage range makes it suitable for both 12V and 24V systems.
When designing with the L9942-TR, ensure proper PCB layout with adequate copper area for the exposed pad to manage thermal dissipation. The SPI lines should be kept short and shielded to avoid noise, and the supply voltage should be decoupled with a 100nF ceramic capacitor close to the VCC pin. The device's diagnostic features can be used to implement predictive maintenance in industrial applications.
Drop-in-Alternativen für L9942-TR – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit L9942-TR (gleiche Bauform und Footprint) – abweichend in Package, Protection Features.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
L9942
✅ Drop-In✓ Auf Lager
$3.1 / Stück
Datenblatt ansehen →L9945
⚡ Gleiches Gehäuse ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
TLE6228GP
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
L9942-TR Grenzwerte & elektrische Eigenschaften
| Number of Channels | 2 |
| Ausgangstyp | Low-Side |
| Supply Voltage Range | 4.5 V to 40 V |
| Output Current per Channel | 1.5 A |
| Control Interface | SPI (16-bit) |
| SPI Clock Frequency | 5 MHz |
| Ruhestrom | 50 uA (standby) |
| Betriebstemperaturbereich | -40C to +150C |
| Gehäuse | PowerSO-20 |
| Montageart | Surface Mount |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit |
| Diagnostics | SPI fault reporting |
| RoHS-Status | Compliant |
| AEC-Q100 | Qualified |
| Technology | BCD (Bipolar-CMOS-DMOS) |
L9942-TR Pin-Konfiguration
| Pin 1 | OUT1 — Output channel 1 |
| Pin 2 | OUT1 — Output channel 1 (duplicate) |
| Pin 3 | GND — Ground |
| Pin 4 | GND — Ground (duplicate) |
| Pin 5 | VCC — Supply voltage |
| Pin 6 | VCC — Supply voltage (duplicate) |
| Pin 7 | SCK — SPI clock |
| Pin 8 | SDI — SPI data input |
| Pin 9 | SDO — SPI data output |
| Pin 10 | CS — Chip select |
| Pin 11 | OUT2 — Output channel 2 |
| Pin 12 | OUT2 — Output channel 2 (duplicate) |
| Pin 13 | GND — Ground |
| Pin 14 | GND — Ground (duplicate) |
| Pin 15 | VCC — Supply voltage |
| Pin 16 | VCC — Supply voltage (duplicate) |
| Pin 17 | NC — Not connected |
| Pin 18 | NC — Not connected |
| Pin 19 | NC — Not connected |
| Pin 20 | NC — Not connected |
Typische Anwendungen
L9942-TR ist geeignet für 6 Anwendungs: Automotive Body Control Module, Industrial PLC Output Module, Automotive LED Lighting, Relay Replacement in Smart Home, Industrial Valve Control, Automotive Wiper Control.
Automotive Body Control Module
The L9942-TR is ideal for automotive body control modules (BCMs) where it drives exterior lights, wipers, and relays. Its wide supply voltage range (4.5V to 40V) accommodates load dump transients, and the SPI interface enables diagnostics for fault detection. The dual-channel configuration allows independent control of two loads, reducing component count. The device's AEC-Q100 qualification ensures reliability in harsh automotive environments. In a typical BCM, the L9942-TR is placed between the microcontroller and the load, with the SPI lines connected to the MCU's SPI peripheral. The output channels are connected to the loads via a connector, and the VCC pin is supplied from the vehicle's battery through a protection diode. The device's overcurrent and overtemperature protection prevent damage to the PCB and loads. The low quiescent current of 50uA minimizes battery drain when the vehicle is off, which is critical for meeting standby current regulations. The SPI interface allows the MCU to read fault status and configure the device, enabling predictive maintenance and reducing warranty costs.
Empfohlen
Industrial PLC Output Module
In industrial PLCs, the L9942-TR drives solenoids and valves in output modules. Its 1.5A per channel output is sufficient for small solenoids, and the SPI interface allows the PLC to monitor load status. The wide operating temperature range (-40C to +150C) ensures operation in factory environments. The device's short-circuit protection prevents damage to the PLC backplane. In a typical PLC output module, the L9942-TR is connected to the PLC's backplane bus via SPI, and the output channels are connected to field devices through a terminal block. The VCC pin is supplied from the PLC's 24V power supply, and the GND pin is connected to the common ground. The device's diagnostic features allow the PLC to detect open-load and short-circuit conditions, improving system reliability. The PowerSO-20 package with exposed pad provides good thermal performance, allowing the device to dissipate heat from continuous operation. The SPI interface supports daisy-chaining, enabling multiple output modules to be controlled with a single SPI bus, reducing wiring complexity.
Empfohlen
Automotive LED Lighting
The L9942-TR is used in automotive LED lighting systems for controlling LED arrays. Its current-sensing capability enables precise brightness control, and the SPI interface allows for dynamic lighting effects. The device's wide supply voltage range supports both 12V and 24V systems. In a typical LED lighting application, the L9942-TR is placed between the LED driver and the LED array, with the output channels connected to the LEDs through current-limiting resistors. The SPI interface is used to set the brightness level and read fault status. The device's overcurrent protection prevents damage to the LEDs in case of a short circuit. The low quiescent current is beneficial for daytime running lights that remain on for extended periods. The PowerSO-20 package provides adequate thermal dissipation for the power dissipated in the driver. The device's AEC-Q100 qualification ensures reliability in automotive lighting applications.
Empfohlen
Relay Replacement in Smart Home
The L9942-TR can replace electromechanical relays in smart home systems, providing solid-state switching with diagnostics. Its low-side driver configuration is suitable for controlling AC loads via a relay or directly driving DC loads. The SPI interface allows integration with home automation hubs. In a smart home application, the L9942-TR is used to control lighting, fans, and other appliances. The device's output channels are connected to the loads, and the SPI interface is connected to a microcontroller or Wi-Fi module. The device's protection features prevent damage from overloads, and the diagnostic capabilities allow remote monitoring of load status. The wide supply voltage range (4.5V to 40V) makes it compatible with various power supplies. The low quiescent current is beneficial for battery-powered smart home devices. The PowerSO-20 package is suitable for PCB mounting in compact smart home modules.
Empfohlen
Industrial Valve Control
The L9942-TR is used in industrial valve control systems to drive solenoid valves. Its 1.5A output current is sufficient for most solenoid valves, and the SPI interface provides diagnostics for valve position and health. The device's wide operating temperature range ensures reliable operation in harsh industrial environments. In a typical valve control system, the L9942-TR is placed between the PLC and the solenoid valve, with the output channel connected to the valve coil. The SPI interface is used to control the valve and read fault status. The device's overcurrent protection prevents damage to the valve coil in case of a short circuit. The low quiescent current is beneficial for battery-powered valve controllers. The PowerSO-20 package provides good thermal performance for continuous operation. The device's AEC-Q100 qualification, while intended for automotive, also ensures high reliability in industrial applications.
Empfohlen
Automotive Wiper Control
The L9942-TR is used in automotive wiper control systems to drive the wiper motor. Its dual-channel configuration allows for controlling both the wiper motor and the washer pump. The SPI interface enables diagnostics for wiper position and motor health. The device's wide supply voltage range (4.5V to 40V) accommodates the voltage fluctuations in automotive electrical systems. In a typical wiper control system, the L9942-TR is placed between the body control module and the wiper motor, with the output channels connected to the motor and pump. The SPI interface is used to control the wiper speed and read fault status. The device's overcurrent protection prevents damage to the motor in case of a stall. The low quiescent current is beneficial for reducing battery drain when the wipers are off. The PowerSO-20 package provides adequate thermal dissipation for the motor drive current.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für L9942-TR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | L9942 | L9945 | TLE6228GP |
|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 - same | PowerSO-20 - same | PowerSO-20 - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Infineon |
| Number of Channels | 2 | 2 | 4 | 2 |
| Output Current per Channel | 1.5 A | 1.5 A | 1 A | 1.5 A |
| Supply Voltage Range | 4.5V to 40V | 4.5V to 40V | 4.5V to 40V | 4.5V to 40V |
| SPI Interface | Yes (16-bit) | Yes (16-bit) | Yes (16-bit) | Yes (16-bit) |
| Quiescent Current | 50 uA | 50 uA | 60 uA | 55 uA |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
Wichtigste Unterscheidungsmerkmale
- Dual-channel low-side driver with SPI diagnostics (vs. TLE6228GP)
- Wide supply voltage range (4.5V to 40V) (vs. L9945)
- Low quiescent current of 50uA (vs. L9945)
Designhinweise
The L9942-TR in PowerSO-20 package has an exposed pad for thermal dissipation. Ensure the PCB has a thermal pad with multiple vias to the ground plane to keep the junction temperature below 150C. For continuous operation at 1.5A per channel, calculate power dissipation as P = I^2 * RDS(on) and size the copper area accordingly.
Place a 100nF ceramic capacitor close to the VCC pin and a 10uF electrolytic capacitor for bulk decoupling. Keep SPI lines short and shielded to avoid noise. The exposed pad should be soldered to the PCB ground plane for optimal thermal and electrical performance.
Do not exceed the absolute maximum supply voltage of 40V. Ensure the SPI lines are properly terminated to avoid ringing. The device's diagnostic features should be used to detect open-load and short-circuit conditions. Avoid driving inductive loads without a flyback diode to prevent voltage spikes.
Compliance-Informationen
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page.
