L9985 - Automotive Quad Low-Side Driver | STMicroelectronics
MPN: L9985 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.5 | $3.50 |
| 10 | $3.15 | $31.50 |
| 100 | $2.8 | $280.00 |
| 500 | $2.45 | $1,225.00 |
| 1,000 | $2.1 | $2,100.00 |
Drop-in alternatives for L9985 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:
L9986
β Drop-Inβ 99,999 In Stock
$1.85 / Unit
View Datasheet βTLE6228GP
β Drop-Inπ Reference alternative (not in catalog)
VNQ5050AKTR
β‘ Same Packageβ 99,999 In Stock
$2.27 / Unit
View Datasheet βL9985 Maximum Ratings & Electrical Characteristics
| Number of Channels | 4 |
| Output Current per Channel | 1.5 A |
| Supply Voltage Range | 5.5 V to 40 V |
| On-Resistance (per channel) | 0.5 ohm |
| Operating Temperature Range | -40C to +150C |
| Package | PowerSO-20 |
| Mounting Type | Surface Mount |
| Interface | SPI |
| Protection Features | Overcurrent, Thermal Shutdown, Open-Load Detection |
| AEC-Q100 Qualified | Yes |
| RoHS Compliant | Yes |
| Output Type | Low-Side |
| Switching Frequency | [DATA_NEEDED: Switching Frequency] |
| Standby Current | [DATA_NEEDED: Standby Current] |
| Diagnostic Output | SPI |
L9985 Pin Configuration
| Pin 1 | OUT1 β Output channel 1 |
| Pin 2 | OUT2 β Output channel 2 |
| Pin 3 | OUT3 β Output channel 3 |
| Pin 4 | OUT4 β Output channel 4 |
| Pin 5 | GND β Ground |
| Pin 6 | VCC β Supply voltage |
| Pin 7 | SCK β SPI clock |
| Pin 8 | SDI β SPI data input |
| Pin 9 | SDO β SPI data output |
| Pin 10 | CS β Chip select |
| Pin 11 | GND β Ground |
| Pin 12 | VCC β Supply voltage |
| Pin 13 | OUT1 β Output channel 1 (duplicate) |
| Pin 14 | OUT2 β Output channel 2 (duplicate) |
| Pin 15 | OUT3 β Output channel 3 (duplicate) |
| Pin 16 | OUT4 β Output channel 4 (duplicate) |
| Pin 17 | GND β Ground |
| Pin 18 | VCC β Supply voltage |
| Pin 19 | NC β Not connected |
| Pin 20 | NC β 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
L9985 is suitable for 6 applications: Automotive Body Control Module, Lighting Control, Relay Driver, Solenoid Driver, Industrial Automation, Motor Control.
Automotive Body Control Module
The L9985 is used in body control modules to drive relays, lamps, and solenoids. Its four channels can control multiple loads, while the SPI interface provides diagnostics for fault detection. The wide supply voltage range (5.5 V to 40 V) accommodates automotive battery voltage variations, and the AEC-Q100 qualification ensures reliability in harsh environments. The device's overcurrent and thermal protection prevent damage to the module and loads.
Recommended
Lighting Control
The L9985 can drive automotive lighting loads such as headlamps, tail lamps, and interior lights. Each channel can handle up to 1.5 A, sufficient for most incandescent bulbs. The open-load detection feature identifies burnt-out bulbs, enabling fault reporting to the ECU. The device's low on-resistance minimizes power loss, and the thermal shutdown protects against overload conditions.
Recommended
Relay Driver
The L9985 is ideal for driving relays in automotive and industrial systems. Each channel can drive a relay coil with a holding current of up to 1.5 A, and the built-in freewheeling diode protection (if external) handles inductive kickback. The SPI interface allows the microcontroller to control relay states and read diagnostic information, such as open-load or overcurrent faults. The device's robust design ensures reliable operation in high-vibration environments.
Recommended
Solenoid Driver
The L9985 can drive solenoids in transmission, braking, and industrial automation systems. The device's high current capability (1.5 A per channel) and thermal protection make it suitable for continuous operation. The SPI interface enables precise control and monitoring of solenoid states, while the open-load detection ensures the solenoid is connected. The wide supply voltage range accommodates various system voltages.
Recommended
Industrial Automation
In industrial automation, the L9985 is used to switch loads such as valves, actuators, and indicators. Its robust protection features (overcurrent, thermal shutdown) ensure safe operation in harsh environments. The SPI interface allows integration with PLCs or microcontrollers for centralized control and diagnostics. The PowerSO-20 package with exposed pad facilitates heat dissipation, enabling reliable operation at high ambient temperatures.
Recommended
Motor Control
The L9985 can be used to drive small DC motors in automotive and industrial applications, such as window lifts, seat adjusters, and fans. Each channel can handle up to 1.5 A, sufficient for small motors. The device's low on-resistance reduces power loss, and the thermal shutdown protects against overload. The SPI interface enables speed control via PWM and provides diagnostic feedback.
Recommended
Recommended Products Summary
Engineering reference data for L9985 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9986 | TLE6228GP | VNQ5050AK |
|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 | PowerSO-20 | PowerSO-20 |
| Brand | STMicroelectronics | STMicroelectronics | Infineon | STMicroelectronics |
| Output Current per Channel | 1.5 A | 2 A | 1.5 A | 0.5 A |
| Supply Voltage Range | 5.5 V to 40 V | 5.5 V to 40 V | 5.5 V to 40 V | 4.5 V to 36 V |
| Interface | SPI | SPI | SPI | SPI |
| Output Type | Low-Side | Low-Side | Low-Side | High-Side |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
| On-Resistance | 0.5 ohm | 0.4 ohm | 0.5 ohm | 0.8 ohm |
Key Differentiators
- Lower on-resistance (0.5 ohm) compared to VNQ5050AK (0.8 ohm) (vs VNQ5050AK)
- Higher output current (1.5 A per channel) than VNQ5050AK (0.5 A) (vs VNQ5050AK)
- Same package and pinout as L9986, allowing easy upgrade path (vs L9986)
Design Notes
The L9985 in PowerSO-20 package can dissipate significant power when driving multiple channels at high current. For example, at 1.5 A per channel with 0.5 ohm on-resistance, each channel dissipates 1.125 W, totaling 4.5 W for all four channels. Ensure the exposed pad is soldered to a large copper area on the PCB to keep the junction temperature below the maximum rating. Use thermal vias to enhance heat transfer to the ground plane.
Place decoupling capacitors (100 nF and 10 uF) close to the VCC and GND pins to suppress noise and ensure stable operation. For the SPI interface, keep the traces short and avoid routing them near high-current switching lines to prevent signal integrity issues. Use a ground plane to minimize loop area and reduce EMI.
When driving inductive loads such as relays or solenoids, always connect a freewheeling diode across the load to clamp the inductive kickback voltage. The L9985 does not have internal clamping diodes, so external protection is mandatory to prevent damage to the output transistors. Additionally, ensure the SPI communication is properly initialized before enabling any output channel to avoid unintended switching.
Compliance Information
AEC-Q100 qualified per STMicroelectronics. RoHS compliant. Halogen-free status not specified in available data.
