L9956-TR - Automotive 8-Channel Low-Side Driver | STMicroelectronics
Référence : L9956-TR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.5 | $4,50 |
| 10 | $4.05 | $40,50 |
| 100 | $3.6 | $360,00 |
| 500 | $3.15 | $1 575,00 |
| 1 000 | $2.7 | $2 700,00 |
L9956-TR Présentation
A low-side driver is a type of power switch that connects the load to ground when activated, commonly used in automotive systems to control lamps, relays, solenoids, and LEDs. In the system hierarchy, the L9956-TR functions as a power management IC within the broader category of automotive power switches, which are essential for body control modules (BCMs), lighting control, and actuator driving. Its SPI interface enables microcontroller-based control and real-time diagnostics, making it a key component in smart power distribution.
Key features include eight low-side outputs with a maximum current of 1.5 A per channel, an operating voltage range of 4.5 V to 5.5 V for the logic supply, and a load supply voltage up to 28 V. The device provides overcurrent, overtemperature, and open-load detection, with fault reporting via SPI. It also features a standby mode with low quiescent current, making it suitable for battery-powered automotive applications.
Technically, the L9956-TR uses a smart power technology that integrates power MOSFETs with CMOS control logic on a single die. This architecture allows for precise current control, fast switching, and robust protection. The SPI interface supports daisy-chaining of multiple devices, enabling scalable designs for multi-channel control. The PowerSO-36 package offers a thermal resistance of 30 C/W, facilitating heat dissipation in high-current applications.
Typical applications include automotive body control modules, interior and exterior lighting control, relay and solenoid drivers, and general-purpose low-side switching in 12V automotive systems. The device's diagnostic capabilities make it ideal for applications requiring fault detection and reporting, such as lamp failure detection in lighting systems.
When designing with the L9956-TR, ensure proper thermal management by providing adequate copper area on the PCB for the exposed pad. Additionally, place a 100 nF decoupling capacitor close to the logic supply pin and a bulk capacitor on the load supply to handle inrush currents. The SPI lines should be kept short and shielded to minimize noise in the automotive environment.
Alternatives de remplacement direct pour L9956-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 L9956-TR (même facteur de forme et même empreinte).
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
L9956
✅ Remplacement direct✓ En stock
$2.88 / unité
Voir la fiche technique →L9956-TR Valeurs maximales et caractéristiques électriques
| Number of Channels | 8 |
| Type de sortie | Low-Side |
| Maximum Output Current per Channel | 1.5 A |
| Logic Supply Voltage | 4.5 V to 5.5 V |
| Load Supply Voltage | Up to 28 V |
| Interface | SPI |
| Diagnostics | Overcurrent, Overtemperature, Open-Load |
| Température de fonctionnement | -40C to +150C |
| Boîtier | PowerSO-36 |
| Type de montage | Surface Mount |
| Résistance thermique | 30 C/W |
| Statut RoHS | Compliant |
| AEC-Q100 | Qualified |
Configuration des broches de L9956-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 | OUT5 — Low-side output channel 5 |
| Broche 6 | OUT6 — Low-side output channel 6 |
| Broche 7 | OUT7 — Low-side output channel 7 |
| Broche 8 | OUT8 — Low-side output channel 8 |
| Broche 9 | GND — Ground |
| Broche 10 | VCC — Logic supply voltage (4.5V to 5.5V) |
| Broche 11 | VS — Load supply voltage (up to 28V) |
| Broche 12 | SCK — SPI clock input |
| Broche 13 | SI — SPI data input |
| Broche 14 | SO — SPI data output |
| Broche 15 | CS — SPI chip select (active low) |
| Broche 16 | RST — Reset input (active low) |
Applications typiques
L9956-TR convient pour 6 applications: Automotive Body Control Module, Automotive Lighting Control, Relay and Solenoid Driver, Industrial Low-Side Switching, LED Lighting Control, Automotive Actuator Control.
Automotive Body Control Module
The L9956-TR is ideal for body control modules (BCMs) that manage lighting, locks, and windows. Its 8 low-side channels can drive multiple loads, while SPI diagnostics enable fault detection and reporting. The device's AEC-Q100 qualification ensures reliability in automotive environments. In a typical BCM, the L9956-TR is placed on the PCB with a microcontroller, using SPI to control each output. The load supply is connected to the vehicle battery (12V), and each channel drives a lamp, relay, or solenoid. The device's overcurrent and open-load detection help identify faulty loads, reducing warranty costs. Compared to discrete MOSFETs, the L9956-TR simplifies design and reduces component count, improving overall system reliability.
Recommandé
Automotive Lighting Control
The L9956-TR is well-suited for interior and exterior lighting control, including headlamps, tail lamps, and interior lights. Each channel can drive up to 1.5A, sufficient for most automotive lamps. The open-load detection feature is particularly useful for detecting burnt-out bulbs, enabling warning messages to the driver. In a lighting control module, the L9956-TR receives commands from a body control module via SPI and switches the lamps. The device's thermal management is critical, as lamps can draw high inrush currents. The PowerSO-36 package with exposed pad helps dissipate heat. Compared to relay-based systems, the L9956-TR offers faster switching and longer lifespan, while providing diagnostic feedback.
Recommandé
Relay and Solenoid Driver
The L9956-TR can drive relays and solenoids in automotive systems, such as door locks, fuel injectors, and transmission solenoids. Its low-side configuration is ideal for switching these inductive loads, with built-in freewheeling protection. The device's overcurrent detection prevents damage from shorted loads. In a relay driver application, the L9956-TR is connected to the relay coil, with a flyback diode or internal clamp to handle inductive kickback. The SPI interface allows the microcontroller to control each relay independently and read status. The device's high current capability (1.5A) is sufficient for most automotive relays. Compared to discrete transistor drivers, the L9956-TR integrates protection and diagnostics, reducing external components and improving reliability.
Recommandé
Industrial Low-Side Switching
Although designed for automotive, the L9956-TR can be used in industrial applications requiring multiple low-side switches with diagnostics. Its wide operating temperature range and robust protection make it suitable for factory automation and process control. In an industrial PLC, the L9956-TR can drive solenoids, valves, and indicator lamps. The SPI interface allows integration with industrial microcontrollers. The device's overcurrent and overtemperature protection ensure safe operation in harsh environments. Compared to automotive-grade parts, the L9956-TR offers similar performance at a competitive price, making it a cost-effective solution for industrial control.
Recommandé
LED Lighting Control
The L9956-TR can be used for LED lighting control in automotive and industrial applications. Each channel can drive LED strings with current up to 1.5A, and the open-load detection helps identify failed LEDs. For PWM dimming, an external PWM signal can be applied to the enable pin or via SPI. In an automotive LED lighting system, the L9956-TR is used to switch LED modules, with a microcontroller providing PWM signals for dimming. The device's diagnostic features allow detection of open or shorted LEDs, improving system reliability. Compared to dedicated LED drivers, the L9956-TR offers more channels and flexibility, but lacks built-in current regulation, so external resistors are needed.
Recommandé
Automotive Actuator Control
The L9956-TR is suitable for controlling various actuators in automotive systems, such as seat motors, mirror adjusters, and window lifts. Its 8 channels can drive multiple actuators, while SPI diagnostics enable fault detection. The device's high current capability and thermal management make it suitable for motor driving with external H-bridges. In an actuator control module, the L9956-TR is used to switch the low-side of the motor driver, with the high-side controlled by a separate device. The SPI interface allows the microcontroller to control each actuator and monitor status. Compared to discrete MOSFETs, the L9956-TR simplifies the design and provides integrated protection.
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Récapitulatif des produits recommandés
Données de référence d'ingénierie pour L9956-TR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | L9956 | TLE6228GP |
|---|---|---|---|
| Package | PowerSO-36 | PowerSO-36 | DSO-36 |
| Brand | STMicroelectronics | STMicroelectronics | Infineon |
| Number of Channels | 8 | 8 | 8 |
| Output Current per Channel | 1.5 A | 1.5 A | 0.5 A |
| Logic Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| Load Supply Voltage | Up to 28V | Up to 28V | Up to 34V |
| Interface | SPI | SPI | SPI |
| Diagnostics | Overcurrent, Overtemperature, Open-Load | Overcurrent, Overtemperature, Open-Load | Overcurrent, Overtemperature, Open-Load |
| AEC-Q100 | Qualified | Qualified | Qualified |
Principaux différenciateurs
- Higher output current per channel (1.5A) compared to TLE6228GP (0.5A) (vs TLE6228GP)
- Same package and pinout as L9956, enabling drop-in replacement (vs L9956)
- AEC-Q100 qualified for automotive applications (vs TLE6228GP)
Notes de conception
The L9956-TR in PowerSO-36 package has a thermal resistance of 30 C/W. At maximum load (8 channels at 1.5A each), power dissipation can be significant. For example, with a load supply of 12V and a saturation voltage of 0.5V, each channel dissipates 0.75W, totaling 6W. This would cause a temperature rise of 180C above ambient, exceeding the maximum junction temperature. Therefore, ensure adequate PCB copper area and consider derating the output current or using active cooling in high-power applications.
Place a 100nF ceramic capacitor close to the VCC pin and a 10uF electrolytic capacitor on the VS pin to handle inrush currents. The exposed pad should be soldered to a large copper area for heat dissipation. Keep SPI traces short and shielded to minimize noise, especially in automotive environments with high electromagnetic interference.
Do not exceed the absolute maximum ratings, especially the load supply voltage of 28V. Ensure the logic supply is stable and within 4.5V to 5.5V. When driving inductive loads, use external freewheeling diodes or ensure the device's internal clamp is sufficient. Also, be aware that the SPI interface requires proper pull-up resistors on the CS and SCK lines to avoid floating states.
Informations de conformité
RoHS compliant and AEC-Q100 qualified per STMicroelectronics product page. Halogen-free status not specified in available data.