STMicroelectronics

L9986 - Automotive Quad Low-Side Driver | STMicroelectronics

Name: L9986
Brand: STMicroelectronics
Price: 2.85 USD
Availability: InStock

MPN: L9986 ✓ Active

In Stock (99,999) Ships in 1-3 business days

5.5 V to 40 V Vdss 1.5 A Id 0.35 ohm Rds(on) PowerSO-16 Package Up to 1 kHz Speed

$2.85 USD / Unit

MOQ: 1 |

Volume Pricing

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	$1.85	$1,850.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for L9986 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

L9985

✅ Drop-In

STMicroelectronics

📦 PowerSO-16

4 · 1.5 A · 5.5 V to 40 V · 0.5 ohm · -40C to +150C · PowerSO-20 · Surface Mount · SPI

✓ 99,999 In Stock

$2.1 / Unit

View Datasheet →

BTS724G

⚡ Same Package

📦 PowerSO-16

Different pinout, requires PCB modification

📋 Reference alternative (not in catalog)

L9986 Maximum Ratings & Electrical Characteristics

Number of Channels	4
Output Current per Channel	1.5 A
Supply Voltage Range	5.5 V to 40 V
Output Type	Low-Side
On-Resistance (per channel)	0.35 ohm
Quiescent Current	5 mA
Operating Temperature Range	-40C to +150C
Package	PowerSO-16
Mounting Type	Surface Mount
Protection Features	Overcurrent, Overtemperature, Short-Circuit, Open-Load Detection
AEC-Q100 Qualified	Yes
RoHS Compliant	Yes
Input Logic Level	3.3V/5V compatible
Switching Frequency	Up to 1 kHz
Output Clamp Voltage	45 V

L9986 Pin Configuration

Pin 1	IN1 — Input control for channel 1
Pin 2	OUT1 — Output for channel 1
Pin 3	IN2 — Input control for channel 2
Pin 4	OUT2 — Output for channel 2
Pin 5	IN3 — Input control for channel 3
Pin 6	OUT3 — Output for channel 3
Pin 7	IN4 — Input control for channel 4
Pin 8	OUT4 — Output for channel 4
Pin 9	GND — Ground
Pin 10	GND — Ground
Pin 11	VCC — Supply voltage
Pin 12	VCC — Supply voltage
Pin 13	DIAG — Diagnostic output
Pin 14	NC — Not connected
Pin 15	NC — Not connected
Pin 16	NC — Not connected

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

L9986 is suitable for 6 applications: Automotive Body Control Module, Industrial Relay Driver, LED Lighting Control, Solenoid Driver, Motor Control, General Purpose Switching.

🚗

Automotive Body Control Module

The L9986 is used in automotive body control modules to drive relays, solenoids, and lamps. Its four independent channels allow control of multiple loads, while the built-in protection and diagnostic features ensure reliable operation in harsh automotive environments. The device's AEC-Q100 qualification and wide supply voltage range (5.5V to 40V) make it suitable for 12V and 24V vehicle systems. In a typical body control module, the L9986 is placed between the microcontroller and the load, with each channel driving a relay or lamp. The open-load detection feature enables fault detection, such as a burnt-out bulb, which is critical for safety and maintenance. The low on-resistance (0.35 ohm) minimizes power dissipation, reducing heat generation in the module. Additionally, the device's thermal shutdown protection prevents damage in case of overload, ensuring long-term reliability.

Recommended

STM32F103 (Microcontroller for control logic) L9680 (Companion driver for high-side switching)

🏭

Industrial Relay Driver

In industrial automation, the L9986 is used to drive relays and solenoids in control panels and machinery. Its high output current (1.5A per channel) and robust protection features make it ideal for switching inductive loads. The device's wide supply voltage range allows operation from 24V industrial supplies, and its low quiescent current (5mA) is beneficial for energy-efficient systems. The L9986's open-load detection can be used to monitor relay coil integrity, preventing failures in critical processes. The PowerSO-16 package provides good thermal performance, allowing continuous operation at moderate currents. In a typical industrial relay driver circuit, the L9986 is controlled by a PLC or microcontroller, with each channel driving a relay coil. The built-in overcurrent and overtemperature protection ensure safe operation even in fault conditions, reducing downtime and maintenance costs.

Recommended

STM32F407 (Microcontroller for industrial control) L6205 (Motor driver for related applications)

💡

LED Lighting Control

The L9986 can be used to control LED lighting in automotive and industrial applications. Each channel can drive a string of LEDs or an LED module, with the low-side switch providing a ground path. The device's current capability (1.5A) is sufficient for many LED lighting applications, and its protection features prevent damage from overcurrent or short circuits. The open-load detection can be used to detect failed LED strings, enabling fault reporting. In automotive lighting, the L9986 is used for daytime running lights, tail lights, and interior lighting. The wide supply voltage range (5.5V to 40V) accommodates various LED configurations, and the low on-resistance minimizes voltage drop, ensuring consistent brightness. The device's AEC-Q100 qualification ensures reliability in automotive environments.

Recommended

LED6000 (LED driver for high-power applications) STM8S003 (Microcontroller for lighting control)

🔧

Solenoid Driver

The L9986 is well-suited for driving solenoids in automotive and industrial systems, such as fuel injectors, valves, and locking mechanisms. Its high output current and inductive load handling capability make it ideal for these applications. The device's output clamp voltage (45V) safely handles the back-EMF generated when the solenoid is de-energized, preventing damage to the switch. The built-in overcurrent and overtemperature protection ensure reliable operation even in harsh conditions. In a typical solenoid driver circuit, the L9986 is controlled by a microcontroller, with each channel driving a solenoid. The open-load detection can be used to detect a disconnected solenoid, enabling fault diagnostics. The device's wide supply voltage range and AEC-Q100 qualification make it suitable for automotive solenoid applications.

Recommended

STM32F0 (Microcontroller for solenoid control) L9826 (Octal low-side driver for additional channels)

⚡

Motor Control

The L9986 can be used in low-power motor control applications, such as driving small DC motors or stepper motors. Each channel can be used to control a motor winding or a motor direction switch. The device's current capability (1.5A) is suitable for small motors, and its protection features prevent damage from overcurrent or short circuits. In a typical motor control circuit, the L9986 is used as a low-side switch in an H-bridge configuration, with external high-side switches. The device's fast switching capability (up to 1kHz) is sufficient for many motor control applications. The open-load detection can be used to detect a disconnected motor, enabling fault diagnostics. The device's wide supply voltage range and thermal protection make it suitable for industrial and automotive motor control.

Recommended

L6205 (Motor driver for higher power) STM32F103 (Microcontroller for motor control)

🔧

General Purpose Switching

The L9986 is a versatile quad low-side driver that can be used for general-purpose switching in various applications, including test equipment, consumer electronics, and industrial controls. Its four independent channels allow multiple loads to be switched with a single IC, reducing component count and board space. The device's wide supply voltage range (5.5V to 40V) and logic-level inputs (3.3V/5V compatible) make it easy to interface with microcontrollers and other digital logic. The built-in protection features ensure safe operation in fault conditions, and the open-load detection provides diagnostic capability. In a typical general-purpose switching application, the L9986 is used to control lamps, relays, or small motors, with each channel driven by a GPIO pin. The device's low quiescent current and thermal performance make it suitable for battery-powered and high-temperature environments.

Recommended

STM32G0 (Microcontroller for general control) L9826 (Octal low-side driver for more channels)

Recommended Products Summary

STM32F103 Microcontroller for control logic Used in: Automotive Body Control Module, Motor Control L9680 Companion driver for high-side switching Used in: Automotive Body Control Module STM32F407 Microcontroller for industrial control Used in: Industrial Relay Driver L6205 Motor driver for related applications Used in: Industrial Relay Driver, Motor Control LED6000 LED driver for high-power applications Used in: LED Lighting Control STM8S003 Microcontroller for lighting control Used in: LED Lighting Control STM32F0 Microcontroller for solenoid control Used in: Solenoid Driver L9826 Octal low-side driver for additional channels Used in: Solenoid Driver, General Purpose Switching STM32G0 Microcontroller for general control Used in: General Purpose Switching

What is the L9986?

The L9986 is a quad low-side driver IC from STMicroelectronics, designed for automotive and industrial applications. It integrates four independent low-side power switches with protection features, capable of driving up to 1.5 A per channel.

What is the supply voltage range of L9986?

The L9986 operates over a supply voltage range of 5.5V to 40V, making it suitable for automotive battery systems (12V and 24V) and industrial supplies.

What is the output current capability of L9986?

Each of the four output channels of the L9986 can deliver up to 1.5 A continuous current, with a total package power dissipation limit that must be considered for high-current applications.

What protection features does L9986 have?

The L9986 includes overcurrent, overtemperature, short-circuit, and open-load detection protection. These features enhance system reliability and simplify fault diagnostics.

Is L9986 AEC-Q100 qualified?

Yes, the L9986 is AEC-Q100 qualified, making it suitable for automotive applications that require high reliability and compliance with industry standards.

What is the package of L9986?

The L9986 is available in a PowerSO-16 package, which provides good thermal performance for surface-mount applications.

What is the on-resistance of L9986?

The on-resistance of each channel in the L9986 is typically 0.35 ohm, which minimizes power dissipation and voltage drop across the switch.

Can L9986 drive inductive loads?

Yes, the L9986 is designed to drive inductive loads such as relays and solenoids. It includes output clamping to handle inductive load demagnetization safely.

What is the operating temperature range of L9986?

The L9986 operates over a temperature range of -40C to +150C, making it suitable for harsh automotive and industrial environments.

What is the quiescent current of L9986?

The quiescent current of the L9986 is typically 5 mA, which is low enough for battery-powered applications that require minimal standby power consumption.

Where can I buy L9986?

The L9986 is available from major distributors such as DigiKey and Mouser. As of 2026-08-13, pricing starts at $2.85 for single-unit quantities, with volume discounts available.

What is the price of L9986?

As of 2026-08-13, the L9986 is priced at $2.85 for 1 unit, $2.56 for 10 units, $2.28 for 100 units, $2.05 for 500 units, and $1.85 for 1000 units, based on distributor data.

What is the lead time for L9986?

The typical lead time for L9986 is 4-6 weeks from STMicroelectronics, but it may vary depending on distributor stock and order quantity. Check with your preferred distributor for current availability.

Is L9986 in stock?

Stock availability for L9986 varies by distributor. As of 2026-08-13, DigiKey and Mouser typically carry this part, but it is recommended to check their websites for real-time inventory.

What is the difference between L9986 and L9985?

The L9986 and L9985 are both quad low-side drivers from STMicroelectronics, but the L9986 offers a higher output current capability (1.5A vs 1A) and includes additional diagnostic features. They are pin-compatible in the PowerSO-16 package, but verify the datasheet for exact differences.

When should I choose L9986 over L9985?

Choose the L9986 when you need higher output current (up to 1.5A per channel) and enhanced diagnostic features such as open-load detection. If your application requires only 1A per channel and simpler diagnostics, the L9985 may be a cost-effective alternative.

What is the best drop-in replacement for L9986?

The best drop-in replacement for L9986 is the L9985 from STMicroelectronics, which shares the same PowerSO-16 package and pinout. For cross-brand options, the BTS724G from Infineon is a functional equivalent, but verify pin compatibility before use.

Can L9985 replace L9986?

Yes, the L9985 can replace the L9986 in most applications, as it is pin-compatible and has similar functionality. However, the L9985 has a lower output current rating (1A vs 1.5A), so ensure your load requirements are within its limits.

Where can I download the L9986 datasheet PDF?

The L9986 datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/l9986.pdf. It contains detailed specifications, pinout, and application information.

Where can I find the L9986 pinout?

The L9986 pinout is provided in the datasheet, which is available at https://www.st.com/resource/en/datasheet/l9986.pdf. The PowerSO-16 package has 16 pins, with four output channels, supply, ground, and control inputs.

What are the key specifications of L9986 that engineers should know?

The L9986 is a quad low-side driver with 1.5A per channel, 5.5V to 40V supply range, 0.35 ohm on-resistance, and AEC-Q100 qualification. It features overcurrent, overtemperature, short-circuit, and open-load protection, making it ideal for automotive relay and solenoid driving.

Hey Google, what can replace L9986?

The L9986 can be replaced by the L9985 from STMicroelectronics, which is pin-compatible and has similar functionality. For cross-brand options, the BTS724G from Infineon is a functional equivalent, but verify pin compatibility before use.

Is L9986 the same as L9985?

No, the L9986 and L9985 are not identical. The L9986 has a higher output current rating (1.5A vs 1A) and additional diagnostic features, but they share the same PowerSO-16 package and pinout, making them drop-in compatible in most designs.

What is the best Infineon equivalent for L9986?

The best Infineon equivalent for L9986 is the BTS724G, which is a quad low-side driver with similar current capability and protection features. However, it is not pin-compatible, so PCB modification may be required.

Engineering reference data for L9986 — comparison, design guidance, and compliance information.

Selection Guide

Choose the L9986 when you need a quad low-side driver with high output current (1.5A per channel) and advanced diagnostic features such as open-load detection. It is ideal for automotive body control modules, industrial relay drivers, and LED lighting control. If your application requires only 1A per channel and simpler diagnostics, the L9985 is a cost-effective alternative with the same package and pinout. For cross-brand options, the Infineon BTS724G offers similar performance but has a different pinout, requiring PCB modification. The L9986 is the best choice for designs that prioritize current capability, diagnostic functionality, and AEC-Q100 compliance.

Comparison with Alternatives

Parameter	This Product	L9985	BTS724G
Package	PowerSO-16	PowerSO-16	PowerSO-16
Brand	STMicroelectronics	STMicroelectronics	Infineon
Number of Channels	4	4	4
Output Current per Channel	1.5 A	1 A	1.5 A
Supply Voltage Range	5.5V to 40V	5.5V to 40V	5.5V to 40V
On-Resistance	0.35 ohm	0.5 ohm	0.3 ohm
Protection Features	Overcurrent, Overtemperature, Short-Circuit, Open-Load Detection	Overcurrent, Overtemperature, Short-Circuit	Overcurrent, Overtemperature, Short-Circuit
AEC-Q100 Qualified	Yes	Yes	Yes

Key Differentiators

Higher output current per channel (1.5A) compared to L9985 (1A) (vs L9985)
Includes open-load detection feature (vs L9985)
Lower on-resistance (0.35 ohm) compared to L9985 (0.5 ohm) (vs L9985)

Design Notes

The L9986 can dissipate significant power when driving high currents. For example, at 1.5A per channel with a 0.35 ohm on-resistance, each channel dissipates approximately 0.79W. With all four channels active, total dissipation is about 3.15W. The PowerSO-16 package has a thermal resistance of approximately 40C/W (theta_JA), so the junction temperature rise would be 126C above ambient. Ensure adequate PCB copper area and airflow to keep the junction temperature within the rated range.

Place decoupling capacitors (100nF and 10uF) close to the VCC pins to filter supply noise. For each output, add a flyback diode (e.g., 1N4007) across inductive loads to protect the switch from back-EMF. Keep output traces short and wide to minimize inductance and resistance.

Do not exceed the maximum supply voltage of 40V. Ensure the input logic levels are compatible with the microcontroller (3.3V/5V). When driving inductive loads, always use a flyback diode to prevent voltage spikes that could damage the device. Also, monitor the DIAG pin for fault conditions and implement appropriate software handling.