ACPL-329J / HCPL-329J intelligent gate drive optocoupler — 1.5A, VCE protection, SOP-16

The ACPL-329J (also known as HCPL-329J or A329J) is an advanced intelligent gate drive optocoupler from Broadcom, designed to simplify and enhance IGBT gate drive circuit design. With a 1.5A output current capability and integrated protection features, it provides a compact, cost-effective, and easy-to-implement solution for driving power IGBTs and MOSFETs in motor drives, inverters, and industrial power conversion systems.

The device integrates an AlGaAs LED optically coupled to a high-performance output stage IC, providing galvanic isolation between the control side and the power side. Its comprehensive built-in protection suite — including V_CE desaturation detection, UVLO, soft turn-off, active Miller clamping, and isolated fault feedback — eliminates the need for multiple discrete protection components, significantly reducing BOM complexity and PCB area.

Key Specifications:

• Part number: ACPL-329J / HCPL-329J / A329J
• Output current: 1.5A (peak gate drive)
• Isolation voltage: V_IORM = 1414V_PEAK
• Supply voltage (V_CC2): 15V–30V (output side)
• Compatible IGBT ratings: up to 1200V / 100A (direct drive)
• Package: SOP-16 (SMD, 16-pin)
• Propagation delay: low (high-speed switching)

Integrated Protection Features:

• V_CE desaturation detection — monitors IGBT collector-emitter voltage to detect overcurrent/short-circuit conditions
• Under-voltage lockout (UVLO) — prevents IGBT turn-on when gate drive supply is insufficient
• Soft IGBT turn-off — controlled gate discharge during fault to prevent destructive di/dt spikes
• Active Miller clamping — suppresses parasitic turn-on due to Miller capacitance during fast switching
• Isolated open-collector fault feedback — reports fault condition back to the controller across the isolation barrier

Key Features:

• 1.5A gate drive output — directly drives IGBTs up to 1200V/100A without discrete buffer stage
• Galvanic isolation — 1414V_PEAK working insulation voltage
• All-in-one protection — replaces multiple discrete protection circuits in a single SOP-16 package
• SOP-16 SMD package — compact footprint for high-density power PCB designs

Applications:

• Industrial motor drive inverter gate drive stages
• Solar inverter IGBT gate drivers
• UPS and power conversion IGBT drive circuits
• Servo drive and variable frequency drive (VFD) designs
• Induction heating IGBT gate drive
• Three-phase inverter bridge gate drive

Note: For IGBTs with ratings exceeding 1200V/100A, the ACPL-329J can drive a discrete power buffer stage. Refer to the ACPL-329J datasheet for full application circuit, bootstrap supply design, and V_CE detection resistor selection guidelines.