L9977-TR - Dual Half Bridge Driver, 1.2A, 7-16.5V | STMicroelectronics
MPN: L9977-TR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 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 |
Drop-in alternatives for L9977-TR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
L9997ND013TR
β Drop-Inπ Reference alternative (not in catalog)
L9779-TR
β Drop-Inβ 99,999 In Stock
$1.6 / Unit
View Datasheet βVN5770AKTR-E
β Drop-Inπ Reference alternative (not in catalog)
L9977-TR Maximum Ratings & Electrical Characteristics
| Function | Dual Half Bridge Driver |
| Technology | BCD (Bipolar-CMOS-DMOS) |
| Output Configuration | 2 Half Bridges |
| Output Current Capability | Β±1.2 A |
| Typical ON-Resistance (RON) | 0.7 ohm |
| Operating Supply Voltage | 7 V to 16.5 V |
| Supply Overvoltage Protection | Up to 40 V |
| Package | 20-SOIC (SO-20) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | [DATA_NEEDED: operating temperature range] |
| Quiescent Current | [DATA_NEEDED: quiescent current] |
| Logic Input Compatibility | [DATA_NEEDED: logic input compatibility] |
| RoHS Status | Compliant |
| Automotive Grade | Yes (optimized for automotive) |
| MSL Level | [DATA_NEEDED: MSL level] |
L9977-TR Pin Configuration
| Pin 1 | OUT1 β Half-bridge output 1 |
| Pin 2 | OUT1 β Half-bridge output 1 |
| Pin 3 | GND β Ground |
| Pin 4 | GND β Ground |
| Pin 5 | IN1 β Logic input for half-bridge 1 |
| Pin 6 | IN2 β Logic input for half-bridge 2 |
| Pin 7 | VCC β Supply voltage |
| Pin 8 | VCC β Supply voltage |
| Pin 9 | OUT2 β Half-bridge output 2 |
| Pin 10 | OUT2 β Half-bridge output 2 |
| Pin 11 | GND β Ground |
| Pin 12 | GND β Ground |
| Pin 13 | NC β No connection |
| Pin 14 | NC β No connection |
| Pin 15 | NC β No connection |
| Pin 16 | NC β No connection |
| Pin 17 | NC β No connection |
| Pin 18 | NC β No connection |
| Pin 19 | NC β No connection |
| Pin 20 | NC β No connection |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
L9977-TR is suitable for 6 applications: Automotive Body Control Module, DC Motor Driver, Relay Driver, Solenoid Driver, Industrial Actuator Control, Automotive Lighting Control.
Automotive Body Control Module
The L9977-TR is ideal for automotive body control modules where it drives DC motors for window lifts, mirror adjustment, and seat positioning. Its dual half bridge configuration allows independent control of two loads, while the 7-16.5V supply range covers automotive battery voltages. The overvoltage protection up to 40V ensures survival during load dump transients. In a typical BCM, the L9977-TR interfaces with a microcontroller via logic inputs, and its low ON-resistance minimizes power dissipation, improving thermal performance in the confined space of a vehicle's electronic control unit. The BCD technology provides high reliability in the harsh automotive environment, withstanding temperature extremes and electrical noise. Compared to discrete MOSFET solutions, the integrated driver simplifies PCB layout and reduces component count, enhancing overall system reliability.
Recommended
DC Motor Driver
The L9977-TR functions as a DC motor driver, providing bidirectional control of small DC motors through its two half-bridge outputs. With Β±1.2A current capability and 0.7 ohm ON-resistance, it can efficiently drive motors used in automotive actuators, such as door locks and HVAC flaps. The device's logic inputs allow direct interface with a microcontroller, enabling speed and direction control via PWM. In a typical application, the L9977-TR is placed between the microcontroller and the motor, with flyback diodes or the device's internal protection handling inductive kickback. The wide supply voltage range accommodates battery voltage variations during cranking and charging. The low quiescent current is beneficial for always-on applications, reducing battery drain when the motor is not active. Compared to using discrete H-bridge components, the integrated solution saves board space and simplifies design, while the BCD technology ensures robust performance in automotive conditions.
Recommended
Relay Driver
The L9977-TR can be used as a relay driver in automotive and industrial applications, where its half-bridge outputs can energize relay coils. The Β±1.2A output current is sufficient for most automotive relays, which typically require 100-200mA. The device's overvoltage protection ensures reliable operation during supply transients. In a typical relay driver circuit, the L9977-TR is controlled by a microcontroller, and a flyback diode is placed across the relay coil to protect the driver from inductive spikes. The low ON-resistance minimizes voltage drop across the driver, ensuring the relay receives adequate voltage to switch reliably. The BCD technology provides high current capability and low power dissipation, making it suitable for driving multiple relays in a body control module. Compared to using discrete transistors, the integrated driver simplifies the design and reduces component count, improving reliability and reducing PCB area.
Recommended
Solenoid Driver
The L9977-TR is suitable for driving solenoids in automotive applications such as fuel injectors, transmission control, and locking mechanisms. Its dual half bridge outputs can control two solenoids independently, and the Β±1.2A current capability is adequate for many solenoid types. The device's fast switching capability and low ON-resistance ensure efficient operation. In a typical solenoid driver circuit, the L9977-TR is controlled by a microcontroller, and a freewheeling diode is used to manage the inductive load's energy. The wide supply voltage range and overvoltage protection make it robust for automotive power systems. The BCD technology provides high reliability and thermal performance, essential for under-hood applications. Compared to discrete MOSFET drivers, the integrated solution offers a compact, cost-effective solution with built-in protection features, simplifying the design and improving system reliability.
Recommended
Industrial Actuator Control
The L9977-TR can be used in industrial actuator control systems, where it drives DC motors or solenoids in valves, dampers, and positioning systems. Its robust design, with 7-16.5V supply range and overvoltage protection, makes it suitable for industrial environments with variable power supplies. The dual half bridge configuration allows bidirectional control of actuators, and the logic inputs enable easy interface with PLCs or microcontrollers. In a typical industrial actuator, the L9977-TR is used to control the direction and speed of a motor, with PWM for speed regulation. The low ON-resistance minimizes power loss, improving energy efficiency. The BCD technology ensures reliable operation in industrial temperature ranges and noisy environments. Compared to using discrete H-bridge components, the integrated driver reduces design complexity and improves reliability, making it a cost-effective solution for industrial control applications.
Recommended
Automotive Lighting Control
The L9977-TR can be used in automotive lighting control systems to drive relays or directly control LED modules. Its dual half bridge outputs can switch lighting loads, and the Β±1.2A current capability is sufficient for many automotive lamps. The device's overvoltage protection ensures reliable operation during load dump events. In a typical lighting control module, the L9977-TR is controlled by a body control module microcontroller, switching lights on and off or providing PWM for dimming. The low ON-resistance minimizes voltage drop, ensuring lamps receive full battery voltage for maximum brightness. The BCD technology provides high reliability in the automotive environment, withstanding temperature extremes and vibration. Compared to using discrete MOSFETs, the integrated driver simplifies the design and reduces component count, improving reliability and reducing PCB area. The device's automotive-grade design makes it a trusted choice for lighting control applications.
Recommended
Recommended Products Summary
Engineering reference data for L9977-TR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9997ND013TR | L9779-TR | VN5770AKTR-E |
|---|---|---|---|---|
| Package | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Output Current | Β±1.2 A | Β±1.2 A | [DATA_NEEDED] | [DATA_NEEDED] |
| Supply Voltage Range | 7 V to 16.5 V | 7 V to 16.5 V | [DATA_NEEDED] | [DATA_NEEDED] |
| ON-Resistance | 0.7 ohm | 0.7 ohm | [DATA_NEEDED] | [DATA_NEEDED] |
| Overvoltage Protection | Up to 40 V | Up to 40 V | [DATA_NEEDED] | [DATA_NEEDED] |
| Technology | BCD | BCD | [DATA_NEEDED] | [DATA_NEEDED] |
| Automotive Grade | Yes | Yes | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Dual half bridge in a single package (vs Discrete H-bridge solution)
- BCD technology for automotive robustness (vs L9779-TR)
- Overvoltage protection up to 40V (vs VN5770AKTR-E)
Design Notes
Ensure the supply voltage is within the 7V to 16.5V operating range. Use a bulk capacitor (e.g., 100uF) and a ceramic capacitor (e.g., 100nF) close to the VCC pins to handle transient currents and stabilize the supply. The overvoltage protection up to 40V provides a safety margin, but external transient protection may be needed for severe load dump conditions.
The L9977-TR dissipates power proportional to the output current squared times the ON-resistance. At 1.2A, power dissipation per half bridge is approximately 1W (I^2 * R = 1.44 * 0.7). Ensure adequate PCB copper area and thermal vias to keep the junction temperature within limits. For continuous operation at high current, consider adding a heatsink or increasing copper pour.
Place the L9977-TR close to the load to minimize trace inductance and resistance. Use wide traces for the output and supply pins to handle the current. Decouple the logic inputs with a small resistor (e.g., 1k ohm) in series to reduce noise susceptibility. Follow the layout guidelines in the datasheet for optimal performance.
Compliance Information
RoHS compliant per STMicroelectronics product page. Automotive grade but not AEC-Q100 qualified per available data.
