L9981-TR - Automotive Quad Low-Side Driver | STMicroelectronics
Référence : L9981-TR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.5 | $2,50 |
| 10 | $2.25 | $22,50 |
| 100 | $2 | $200,00 |
| 500 | $1.8 | $900,00 |
| 1 000 | $1.6 | $1 600,00 |
L9981-TR Présentation
A low-side driver is a type of power switch that connects the load to ground when activated, allowing the load to be powered from a positive supply rail. In automotive systems, low-side drivers are commonly used to control actuators, lamps, and motors, where the load is connected between the battery positive terminal and the driver output. The L9981-TR belongs to the family of smart power switches, which integrate protection and diagnostic features to enhance system reliability.
Key features of the L9981-TR include four independent output channels, each capable of handling continuous currents up to A, with built-in overcurrent, overtemperature, and short-circuit protection. The device also features a serial peripheral interface (SPI) for advanced diagnostics and control, allowing real-time monitoring of output status and fault conditions. The operating voltage range is V, and the device is qualified to AEC-Q100 standards for automotive applications.
The L9981-TR utilizes a robust BCD (Bipolar-CMOS-DMOS) process technology, which combines high-voltage capability with low on-resistance and fast switching performance. This architecture ensures efficient power delivery and minimizes power dissipation, even at high switching frequencies. The integrated protection features reduce the need for external components, simplifying the overall system design and improving reliability.
Typical applications include automotive body control modules, lighting control, relay and solenoid drivers, and industrial automation systems. The device's SPI interface enables seamless integration with microcontrollers, providing enhanced diagnostic capabilities for predictive maintenance and fault detection. The wide operating temperature range of -40°C to +150°C makes it suitable for harsh environments.
When designing with the L9981-TR, it is essential to ensure proper thermal management by providing adequate copper area on the PCB for heat dissipation. Additionally, the SPI interface should be configured correctly to enable fault reporting and output control. The device's protection features should be considered in the system design to avoid unintended shutdowns during transient conditions.
Alternatives de remplacement direct pour L9981-TR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec L9981-TR (même facteur de forme et même empreinte) — différant par Operating Temperature Range, Protection Features.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
L9980
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$2.1 / unité
Voir la fiche technique →VNQ7004SY
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC33879
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
L9981-TR Valeurs maximales et caractéristiques électriques
| Nombre de sorties | 4 |
| Type de sortie | Low-Side |
| Interface | SPI |
| Protection Features | Overcurrent, Overtemperature, Short-Circuit |
| Plage de température de fonctionnement | -40°C to +150°C |
| Type de montage | Surface Mount |
| Qualification | AEC-Q100 |
| Statut RoHS | Compliant |
| REACH Status | Compliant |
| Lead-Free | Yes |
| Sans halogène | Yes |
Configuration des broches de L9981-TR
| Broche 1 | OUT1 — Low-side output channel 1 |
| Broche 2 | OUT2 — Low-side output channel 2 |
| Broche 3 | OUT3 — Low-side output channel 3 |
| Broche 4 | OUT4 — Low-side output channel 4 |
| Broche 5 | GND — Ground |
| Broche 6 | VCC — Supply voltage |
| Broche 7 | SCLK — SPI clock |
| Broche 8 | SDI — SPI data input |
| Broche 9 | SDO — SPI data output |
| Broche 10 | CS — SPI chip select |
Applications typiques
L9981-TR convient pour 6 applications: Automotive Body Control Module, Automotive Lighting Control, Industrial Automation, Relay and Solenoid Driver, LED Lighting Control, Motor Control.
Automotive Body Control Module
The L9981-TR is ideal for automotive body control modules where multiple loads such as relays, solenoids, and LEDs need to be controlled. Its quad low-side outputs and SPI interface enable efficient management of various actuators, while the AEC-Q100 qualification ensures reliability in harsh automotive environments. The device's protection features prevent damage from overcurrent and short-circuit conditions, enhancing system safety. With its wide operating temperature range, it can withstand the thermal stresses of under-hood and interior applications. The SPI interface allows the microcontroller to monitor each output's status and detect faults in real-time, enabling predictive maintenance and reducing downtime. The L9981-TR's low on-resistance minimizes power dissipation, improving overall energy efficiency in the vehicle's electrical system.
Recommandé
Automotive Lighting Control
The L9981-TR can be used to control automotive lighting systems, including headlights, taillights, and interior lights. Its low-side configuration allows the load to be connected to the battery positive terminal, with the driver switching the ground path. The device's high current capability and protection features ensure reliable operation of incandescent bulbs and LED modules. The SPI interface enables dimming and diagnostic functions, allowing the system to detect bulb failures and report them to the vehicle's ECU. The wide operating temperature range ensures consistent performance in extreme weather conditions. The L9981-TR's compact package and surface-mount design facilitate integration into space-constrained lighting modules, reducing overall system size and weight.
Recommandé
Industrial Automation
In industrial automation, the L9981-TR can drive solenoids, valves, and actuators in control systems. Its robust protection features and wide temperature range make it suitable for factory floor environments. The SPI interface allows for centralized control and monitoring from a PLC or industrial PC, enabling efficient management of multiple output channels. The device's low on-resistance reduces power loss, contributing to energy savings in continuous operation. The L9981-TR's ability to handle inductive loads with built-in clamping ensures reliable switching of solenoids without external flyback diodes. Its compact footprint and surface-mount package simplify PCB layout and reduce assembly costs. The device's diagnostic capabilities facilitate predictive maintenance, reducing unplanned downtime and improving overall system availability.
Recommandé
Relay and Solenoid Driver
The L9981-TR is specifically designed to drive relays and solenoids, which are common in automotive and industrial systems. Its low-side configuration is ideal for switching loads connected to a positive supply. The device's built-in protection against overcurrent and short-circuit prevents damage to the driver and the load. The SPI interface allows for precise control and monitoring of each output, enabling features such as soft-start and fault detection. The L9981-TR's high current capability ensures reliable operation of even high-power relays and solenoids. The device's wide operating voltage range accommodates various supply rails, from 12V automotive systems to 24V industrial controls. Its compact package and surface-mount design make it easy to integrate into existing PCB layouts, reducing design time and cost.
Recommandé
LED Lighting Control
The L9981-TR can be used to control LED lighting systems, providing precise on/off control and dimming capabilities. Its low-side configuration is suitable for driving LED strings connected to a positive supply. The device's constant current capability ensures uniform brightness across multiple LEDs. The SPI interface allows for individual control of each output, enabling dynamic lighting effects and energy-saving strategies. The L9981-TR's protection features prevent damage from overcurrent and overtemperature, ensuring long-term reliability. The device's wide operating temperature range makes it suitable for both indoor and outdoor lighting applications. Its compact package and surface-mount design facilitate integration into LED modules, reducing overall system size and cost.
Recommandé
Motor Control
The L9981-TR can be used in motor control applications, particularly for small DC motors and stepper motors. Its low-side configuration allows for simple on/off control of motor windings. The device's high current capability and protection features ensure reliable operation under varying load conditions. The SPI interface enables advanced control algorithms, such as PWM speed control and fault detection. The L9981-TR's wide operating temperature range makes it suitable for motor control in automotive and industrial environments. The device's low on-resistance minimizes power loss, improving motor efficiency. Its compact package and surface-mount design simplify integration into motor control PCBs, reducing overall system size and cost.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour L9981-TR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | L9980 | VNQ7004SY | MC33879 |
|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors |
| Number of Outputs | 4 | 4 | 4 | 4 |
| Output Type | Low-Side | Low-Side | High-Side | Low-Side |
| Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 |
| Operating Temperature Range | -40°C to +150°C | -40°C to +150°C | -40°C to +150°C | -40°C to +150°C |
Principaux différenciateurs
- SPI interface for advanced diagnostics (vs L9980)
- AEC-Q100 qualification (vs MC33879)
- Low-side output configuration (vs VNQ7004SY)
Notes de conception
Ensure adequate PCB copper area for heat dissipation, especially when driving high currents. The L9981-TR's power dissipation is proportional to the load current and on-resistance. Use thermal vias and a ground plane to improve heat transfer. For continuous operation at high currents, consider adding a heatsink or forced airflow.
Place decoupling capacitors close to the VCC and GND pins to minimize voltage spikes. Use a 100nF ceramic capacitor and a 10uF electrolytic capacitor for bulk decoupling. Keep the SPI lines short and shielded to reduce noise and ensure reliable communication.
Do not exceed the absolute maximum ratings for supply voltage and output current. Ensure the SPI interface is properly configured to avoid unintended output states. When driving inductive loads, the built-in clamping protects the device, but verify that the energy is within the device's capability.
Informations de conformité
Compliance information based on STMicroelectronics product page. AEC-Q100 qualification confirmed.