STMicroelectronics

L9956-TR - Automotive 8-Channel Low-Side Driver | STMicroelectronics

Name: L9956-TR
Brand: STMicroelectronics
Price: 4.50 USD
Availability: InStock

MPN: L9956-TR ✓ Active

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

4.5 V to 5.5 V Vdss 1.5 A Id 30 C/W Rds(on) PowerSO-36 Package

$4.5 USD / Unit

MOQ: 1 |

Volume Pricing

Qty	Unit Price	Extended
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

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

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Drop-in alternatives for L9956-TR — 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:

L9956

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STMicroelectronics

📦 PowerSO-36

8 · Low-Side · 1.5 A · 4.5 V to 5.5 V · 4.5 V to 28 V · 0.5 ohm · 5 MHz (max) · 8-bit

✓ 99,999 In Stock

$2.88 / Unit

View Datasheet →

ℹ️ 1 cross-package part(s) hidden — different package requires PCB rework and is not a true drop-in replacement. Contact us if you need cross-package suggestions.

L9956-TR Maximum Ratings & Electrical Characteristics

Number of Channels	8
Output Type	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
Standby Current	[DATA_NEEDED: Standby current]
Operating Temperature	-40C to +150C
Package	PowerSO-36
Mounting Type	Surface Mount
Thermal Resistance	30 C/W
RoHS Status	Compliant
AEC-Q100	Qualified
MSL Level	[DATA_NEEDED: MSL level]

L9956-TR Pin Configuration

Pin 1	OUT1 — Low-side output channel 1
Pin 2	OUT2 — Low-side output channel 2
Pin 3	OUT3 — Low-side output channel 3
Pin 4	OUT4 — Low-side output channel 4
Pin 5	OUT5 — Low-side output channel 5
Pin 6	OUT6 — Low-side output channel 6
Pin 7	OUT7 — Low-side output channel 7
Pin 8	OUT8 — Low-side output channel 8
Pin 9	GND — Ground
Pin 10	VCC — Logic supply voltage (4.5V to 5.5V)
Pin 11	VS — Load supply voltage (up to 28V)
Pin 12	SCK — SPI clock input
Pin 13	SI — SPI data input
Pin 14	SO — SPI data output
Pin 15	CS — SPI chip select (active low)
Pin 16	RST — Reset input (active low)

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

L9956-TR is suitable for 6 applications: Automotive Body Control Module, Automotive Lighting Control, Relay and Solenoid Driver, Industrial Low-Side Switching, LED Lighting Control, Automotive Actuator Control.

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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.

Recommended

SPC560B50L3 (Microcontroller for SPI control) L5973D (DC-DC converter for logic supply)

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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.

Recommended

L5973D (Power supply for logic) SPC560B50L3 (MCU for control)

🔧

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.

Recommended

SPC560B50L3 (MCU for control) L5973D (Power supply)

🏭

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.

Recommended

STM32F103C8T6 · STMicroelectronics STM32F103C8T6 · STMicroelectronics L5973D (Power supply)

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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.

Recommended

SPC560B50L3 (MCU for PWM control) L5973D (Power supply)

🚗

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.

Recommended

SPC560B50L3 (MCU for control) L5973D (Power supply)

Recommended Products Summary

SPC560B50L3 Microcontroller for SPI control Used in: Automotive Body Control Module, Automotive Lighting Control, Relay and Solenoid Driver, LED Lighting Control, Automotive Actuator Control L5973D DC-DC converter for logic supply Used in: Automotive Body Control Module, Automotive Lighting Control, Relay and Solenoid Driver, Industrial Low-Side Switching, LED Lighting Control, Automotive Actuator Control STM32F103C8T6 STMicroelectronics Used in: Industrial Low-Side Switching, Industrial Low-Side Switching

What is the L9956-TR?

The L9956-TR is an automotive-grade 8-channel low-side driver from STMicroelectronics, designed for driving resistive, inductive, and capacitive loads in automotive body control applications. It integrates eight low-side power outputs with SPI control and diagnostics, and is housed in a PowerSO-36 package. According to the ST datasheet, it operates from a 4.5V to 5.5V logic supply and supports load supply voltages up to 28V.

What is the maximum output current per channel of L9956-TR?

The L9956-TR can deliver up to 1.5A per channel across its eight low-side outputs. This makes it suitable for driving lamps, relays, and solenoids in automotive systems. The current capability is specified in the ST datasheet for the L9956.

What is the operating voltage range of L9956-TR?

The L9956-TR operates with a logic supply voltage between 4.5V and 5.5V, and a load supply voltage up to 28V. This allows it to interface with standard 5V microcontrollers while switching 12V automotive loads. These values are from the ST datasheet.

Does L9956-TR have SPI interface?

Yes, the L9956-TR features a serial peripheral interface (SPI) for control and diagnostics. The SPI interface allows a microcontroller to configure the outputs, read fault status, and daisy-chain multiple devices for scalable designs. This is detailed in the ST datasheet.

What diagnostics does L9956-TR provide?

The L9956-TR provides overcurrent, overtemperature, and open-load detection. These diagnostic features are reported via the SPI interface, enabling real-time fault monitoring in automotive applications. This information is from the ST datasheet.

What is the package of L9956-TR?

The L9956-TR is available in a PowerSO-36 package, which is a surface-mount package with an exposed pad for thermal management. The package is designed for automotive applications requiring high reliability and heat dissipation. This is specified in the ST datasheet.

Is L9956-TR AEC-Q100 qualified?

Yes, the L9956-TR is AEC-Q100 qualified, making it suitable for automotive applications. This qualification ensures the device meets stringent reliability standards for temperature, humidity, and vibration. This is stated in the ST product page.

What is the operating temperature range of L9956-TR?

The L9956-TR operates over a temperature range of -40C to +150C, making it suitable for harsh automotive environments. This range is specified in the ST datasheet.

What are the typical applications of L9956-TR?

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 lamp failure detection and other fault-monitoring applications.

Can L9956-TR be used for LED lighting control?

Yes, the L9956-TR can be used for LED lighting control in automotive applications. Its 1.5A per channel output and open-load detection make it suitable for driving LED strings with fault detection. However, for PWM dimming, an external PWM signal may be needed as the device does not have built-in PWM generation.

What is the difference between L9956-TR and L9956?

The L9956-TR is the tape-and-reel packaging variant of the L9956. The 'TR' suffix indicates tape-and-reel packaging, which is suitable for automated assembly. The electrical specifications are identical between the two variants.

Where can I buy L9956-TR online?

The L9956-TR can be purchased from authorized distributors such as DigiKey, Mouser, and Farnell. As of 2026-08-13, it is listed on DigiKey and Mouser. Prices start at approximately $4.50 for single-unit quantities, with volume discounts available.

What is the price of L9956-TR?

As of 2026-08-13, the L9956-TR is priced at approximately $4.50 for a single unit, $4.05 for 10 units, $3.60 for 100 units, $3.15 for 500 units, and $2.70 for 1000 units. Prices are indicative and may vary by distributor and quantity.

What is the lead time for L9956-TR?

The lead time for L9956-TR is typically 8-12 weeks from STMicroelectronics, depending on stock availability at distributors. For current stock levels, check DigiKey or Mouser. As of 2026-08-13, it is in stock at major distributors.

Is L9956-TR in stock?

As of 2026-08-13, the L9956-TR is in stock at major distributors such as DigiKey and Mouser. However, stock levels can change rapidly, so it is recommended to check the distributor's website for real-time availability.

L9956-TR vs L9956 - which is better for automotive lighting?

The L9956-TR and L9956 are electrically identical; the only difference is packaging (tape-and-reel vs tube). For automotive lighting, both are equally suitable. The L9956-TR is preferred for high-volume production due to its tape-and-reel packaging, which is compatible with automated pick-and-place machines.

When should I choose L9956-TR over a discrete MOSFET driver?

Choose the L9956-TR when you need multiple low-side channels (8) with integrated diagnostics and SPI control. A discrete MOSFET driver would require more components and lack built-in fault reporting. The L9956-TR simplifies design and reduces board space, making it ideal for body control modules.

What is the best drop-in replacement for L9956-TR?

The best drop-in replacement for L9956-TR is the L9956 (non-tape-and-reel variant) from STMicroelectronics, as it is electrically identical and pin-compatible. For cross-brand alternatives, the Infineon TLE6228GP is a potential functional equivalent, but it is not pin-compatible and requires PCB modification. Always verify pinout and specifications before substitution.

Can TLE6228GP replace L9956-TR?

The TLE6228GP from Infineon is a functional equivalent to the L9956-TR, offering 8 low-side channels with SPI control. However, it is not pin-compatible and comes in a different package (DSO-36 vs PowerSO-36). Therefore, it is not a drop-in replacement and requires PCB redesign. For a drop-in replacement, use the L9956.

Where to download L9956-TR datasheet PDF?

The L9956-TR datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/l9956.pdf. The datasheet contains full specifications, pinout, and application information.

Where to find L9956-TR pinout?

The L9956-TR pinout is provided in the datasheet, which is available at https://www.st.com/resource/en/datasheet/l9956.pdf. The pinout diagram shows the PowerSO-36 package with pin assignments for the 8 outputs, SPI pins, and power supplies.

Hey Google, what can replace L9956-TR?

The L9956-TR can be replaced by the L9956 from STMicroelectronics, which is the same device in a different package (tube vs tape-and-reel). For a cross-brand alternative, the Infineon TLE6228GP is functionally similar but not pin-compatible. Always verify pin compatibility before substitution.

Is L9956-TR the same as L9956?

Yes, the L9956-TR is the same as the L9956, with the 'TR' suffix indicating tape-and-reel packaging. The electrical specifications and pinout are identical. The only difference is the packaging format, which affects how the device is supplied for assembly.

What are the key specifications of L9956-TR that engineers should know?

The L9956-TR is an 8-channel low-side driver with a maximum output current of 1.5A per channel, logic supply voltage of 4.5V to 5.5V, and load supply voltage up to 28V. It features SPI control, overcurrent, overtemperature, and open-load diagnostics, and is AEC-Q100 qualified. It operates from -40C to +150C and is housed in a PowerSO-36 package.

What is the best STMicroelectronics equivalent for L9956-TR?

The best STMicroelectronics equivalent for L9956-TR is the L9956, which is the same device without the tape-and-reel packaging. It is pin-compatible and electrically identical, making it a direct drop-in replacement. For other ST low-side drivers, consider the L9950 or L9951, but they have different channel counts and specifications.

Engineering reference data for L9956-TR — comparison, design guidance, and compliance information.

Selection Guide

Choose the L9956-TR when you need an 8-channel low-side driver with high current capability (1.5A per channel) and SPI diagnostics for automotive or industrial applications. It is ideal for body control modules, lighting control, and relay driving. If you require a drop-in replacement, the L9956 is the same device in tube packaging. For applications with lower current requirements (0.5A per channel) and a different package, consider the Infineon TLE6228GP, but note it is not pin-compatible and requires PCB redesign. The L9956-TR offers the best balance of current capability, diagnostics, and package compatibility for most automotive low-side switching needs.

Comparison with Alternatives

Parameter	This Product	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

Key Differentiators

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)

Design Notes

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.