L9971-TR - Automotive Quad Low-Side Driver | STMicroelectronics
料号： L9971-TR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 |
L9971-TR 概述
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 L9971-TR belongs to the family of smart power switches, which integrate protection and diagnostic features to enhance system reliability.
Key features of the L9971-TR include four independent output channels, each capable of delivering continuous output current up to A, with a maximum supply voltage of V. The device incorporates overcurrent protection, thermal shutdown, and undervoltage lockout to safeguard against fault conditions. Additionally, it features a serial peripheral interface (SPI) for advanced diagnostics and control, enabling real-time monitoring of output status and fault detection.
The L9971-TR is built using STMicroelectronics' advanced BCD (Bipolar-CMOS-DMOS) technology, which combines high-voltage capability with low power consumption and fast switching performance. This technology ensures efficient operation and robust performance in harsh automotive environments, with an operating temperature range of -40°C to +150°C. The device is AEC-Q100 qualified, meeting the stringent quality and reliability standards required for automotive applications.
Typical applications include automotive body control modules, lighting control, relay and solenoid drivers, and industrial automation systems. In automotive body control, the L9971-TR can drive exterior and interior lighting, power windows, and door locks, providing reliable switching with diagnostic feedback. In industrial settings, it can control valves, actuators, and small motors, offering protection and monitoring capabilities.
When designing with the L9971-TR, it is essential to consider proper thermal management, as high output currents can generate significant heat. The exposed pad of the package should be soldered to a large copper area on the PCB to enhance heat dissipation. Additionally, appropriate decoupling capacitors should be placed near the supply pins to minimize voltage transients and ensure stable operation.
直接替换替代料： L9971-TR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： L9971-TR （相同外形与封装尺寸） ——差异在于 Output Type, Protection Features.
快速对比工具——选择替代料号进行并排对比：
L9971
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.88 / 个
查看数据手册 →L9971-TR-Q1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
VNQ7004SY
⚡ 相同封装 ⚠️ 规格未核验📋 参考替代料（不在目录中）
L9971-TR 最大额定值与电气特性
| Number of Channels | 4 |
| 输出类型 | Low-Side |
| 接口 | SPI |
| Protection Features | Overcurrent, Thermal Shutdown, Undervoltage Lockout |
| 工作温度范围 | -40°C to +150°C |
| 安装类型 | Surface Mount |
| Qualification | AEC-Q100 |
| RoHS 状态 | Compliant |
| Technology | BCD (Bipolar-CMOS-DMOS) |
L9971-TR 引脚配置
| 引脚 1 | OUT1 — Low-side driver output channel 1 |
| 引脚 2 | OUT2 — Low-side driver output channel 2 |
| 引脚 3 | OUT3 — Low-side driver output channel 3 |
| 引脚 4 | OUT4 — Low-side driver output channel 4 |
| 引脚 5 | GND — Ground |
| 引脚 6 | VCC — Supply voltage |
| 引脚 7 | SCK — SPI clock input |
| 引脚 8 | SDI — SPI data input |
| 引脚 9 | SDO — SPI data output |
| 引脚 10 | CS — SPI chip select |
典型应用
L9971-TR 适用于 6 应用s: Automotive Body Control Module, Lighting Control, Relay and Solenoid Driver, Industrial Automation, LED Matrix Display, Power Distribution.
Automotive Body Control Module
The L9971-TR is ideal for automotive body control modules (BCMs) where multiple low-side loads such as relays, solenoids, and lamps need to be controlled. Its four independent channels allow driving exterior and interior lighting, power windows, and door locks. The SPI interface enables diagnostic feedback, allowing the BCM to monitor load status and detect faults. The AEC-Q100 qualification ensures reliability in harsh automotive environments, with an operating temperature range of -40°C to +150°C. The device's overcurrent and thermal shutdown protection prevent damage during fault conditions, enhancing system safety.
推荐
Lighting Control
The L9971-TR can be used for automotive and industrial lighting control, driving LED arrays or incandescent lamps. Its low-side configuration allows direct connection to the load, with the SPI interface providing precise PWM dimming control. The device's high switching frequency capability enables flicker-free dimming, while the overcurrent protection safeguards against LED short circuits. The wide operating temperature range makes it suitable for exterior lighting applications exposed to extreme temperatures.
推荐
Relay and Solenoid Driver
The L9971-TR is well-suited for driving relays and solenoids in automotive and industrial systems. Its low-side configuration is ideal for switching inductive loads, with built-in freewheeling protection to handle back-EMF. The SPI interface allows individual control of each channel, enabling complex actuation sequences. The device's thermal shutdown protection prevents overheating during prolonged activation, ensuring reliable operation in demanding applications.
推荐
Industrial Automation
In industrial automation, the L9971-TR can control valves, actuators, and small motors. Its robust design, with overcurrent and thermal protection, ensures reliable operation in harsh factory environments. The SPI interface enables integration with PLCs and industrial controllers, providing real-time diagnostics. The wide supply voltage range allows operation from various industrial power rails, and the AEC-Q100 qualification ensures long-term reliability.
推荐
LED Matrix Display
The L9971-TR can be used to drive LED matrix displays, where each channel controls a row or column of LEDs. The SPI interface allows efficient multiplexing and PWM dimming, enabling dynamic display patterns. The device's high current capability and thermal management features support large LED arrays. The low-side configuration simplifies the circuit design, as the LEDs are connected between the supply and the driver output.
推荐
Power Distribution
The L9971-TR can be used in power distribution systems to switch power to various loads. Its four channels allow independent control of multiple loads, with diagnostic feedback for fault detection. The device's protection features prevent damage from overcurrent and thermal events, ensuring system reliability. The SPI interface enables centralized control and monitoring, making it suitable for smart power distribution units.
推荐
推荐产品汇总
工程参考数据： L9971-TR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | L9971 | L9971-TR-Q1 | VNQ7004SY |
|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Number of Channels | 4 | 4 | 4 | 4 |
| Output Type | Low-Side | Low-Side | Low-Side | High-Side |
| Interface | SPI | SPI | SPI | SPI |
| 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 |
| RoHS Status | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Quad low-side driver with SPI diagnostics （对比 VNQ7004SY)
- AEC-Q100 qualified （对比 L9971)
- Tape-and-reel packaging （对比 L9971)
设计说明
The L9971-TR can dissipate significant power when driving high currents. Ensure the exposed pad is soldered to a large copper area on the PCB to enhance heat dissipation. For continuous operation at maximum current, consider adding thermal vias to improve thermal conductivity to other layers.
Place decoupling capacitors (e.g., 100nF and 10uF) close to the VCC pin to filter high-frequency noise and provide stable supply voltage. Keep the SPI lines short and avoid routing them near high-current traces to minimize electromagnetic interference.
When driving inductive loads, ensure proper freewheeling protection is implemented. The L9971-TR includes internal protection, but external flyback diodes may be required for large inductances. Also, verify the supply voltage does not exceed the absolute maximum rating to prevent damage.
合规信息
RoHS compliant per STMicroelectronics product page. AEC-Q100 qualified for automotive applications.