HSD-4 Channel High Side Driver

Need to power multiple solenoids with high-speed switching but without the cost of multiple solid-state relays? The HSD-4 High Side Driver module is designed to control up to four medium-current 12V devices using solid-state switching, perfect for solenoids that require rapid operation.

Features:

• Four High-Side Drivers: Ideal for solenoids that need 12V power instead of ground
• Compatible with MS3Pro, MicroSquirt, or MegaSquirt: Ground-triggered outputs can easily connect to the HSD-4’s inputs
• Handles up to 8 amps per channel: Reliable performance for medium current solenoids
• Epoxy potted: Maximum vibration and water resistance, suitable for underhood use

Applications Include:

• Toyota A340/A341 transmissions
• Subaru W4A33 transaxles
• BMW Double VANOS variable valve timing solenoids
• Other solenoid setups needing rapid switching and 12V power

The HSD-4 module is perfect for situations where the solenoid ground is tied to the body, and only a single 12V wire powers the solenoid. Designed for fast, precise control in demanding environments.

Specifications:

• Operating Voltage: 12V DC
• Maximum Current: 8 Amps per channel
• Number of Channels: 4 High-Side Drivers
• Trigger Type: Ground-triggered
• Switching Frequency: Suitable for rapid switching solenoids
• Module Construction: Epoxy potted for durability and environmental resistance

Included in Box:

• HSD-4 High Side Driver Module

HSD-4 Wiring

Function	Connects to HSD-4  wire	Wire Color
Input A	ECU or TCU	Yellow
Output A	Solenoid	White
Input B	ECU or TCU	Orange
Output B	Solenoid	Pink
Input C	ECU or TCU	Dark green
Output C	Solenoid	Light green
Input D	ECU or TCU	Blue
Output D	Solenoid	Purple
Power	Switched 12V	Red

The red wires should all be grouped together and connected to a single fuse to 12V Switched Power. The fuse should be rated for the total current draw of all outputs being used, up to a maximum of 30 amps.

ECU Connections

The inputs need a ground signal to trigger their outputs. Here are what outputs you can use to trigger the HSD-4 high side driver with DIYAutoTune engine or transmission management.

MS3Pro: High current, PWM, injector, or tach outputs

MSPNP2 Gen 2: Output 1, output 2, boost, or tach outputs

MicroSquirt (transmission control): Shift solenoid, TCC, or EPC outputs

MicroSquirt (engine control): ALED, WLED, FIDLE, or tach outputs

MS3X: Mid current, tach, or injector outputs

MS1 or MS2: Relay control outputs or FIDLE (MS2 only)

GPIO Board: General purpose, PWM, or high current outputs