STMicroelectronics L6386ED

Overview

L6386ED from STMicroelectronics is a high-voltage, dual-channel gate driver IC designed for asymmetrical half-bridge topologies, capable of simultaneously driving high-side (up to 600 V rail) and low-side N-channel MOSFETs or IGBTs. It delivers 400 mA source / 650 mA sink peak output current, achieves 50 ns rise / 30 ns fall times with 1 nF load, and integrates bootstrap diode, UVLO on both VCC and VBOOT, and fault-diagnostic comparator output. Used in induction heating inverters and HVAC motor drives.

For engineers reviewing the L6386ED datasheet, L6386ED pinout, L6386ED application, or L6386ED equivalent, this page provides verified technical context, real-world timing behavior, bootstrap driver design implications, diagnostic signaling logic, and validated alternative options for industrial power stage design.

Technical Context

The L6386ED implements independent high-side (floating) and low-side driver stages using BCD™ "offline" process technology, enabling operation with VBOOT up to 618 V and dV/dt immunity of ±50 V/ns across −45 °C to +125 °C. Its CMOS/TTL Schmitt-trigger inputs provide hysteresis and internal pull-down, ensuring noise-immune logic interfacing.

It features an integrated bootstrap driver with 125 Ω typical R_DS(on), eliminating external fast-recovery diodes while requiring sufficient LVG-on time for C_BOOT recharge. The DIAG open-drain output signals overcurrent faults via an internal comparator referenced to 0.5 V, with input offset voltage ≤±10 mV and bias current ≤0.2 μA.

Key Specifications

Pinout & Package

Available in SO-14 surface-mount package (ECOPACK® compliant), with 1.27 mm pitch, 8.55–8.75 mm body width, and 3.80–4.00 mm body length. Thermal resistance R_th(JA) = 165 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage half-bridge gate driver applications.

Compared with IR2110PbF and UCC27211D, the L6386ED uniquely combines integrated bootstrap diode, dual-rail UVLO, and comparator-based DIAG output in a single SO-14 package-reducing component count and improving functional safety compliance in IEC 60730-compliant motor drives.

Availability

L6386ED is available at Aetrix Electronics and suitable for induction heating inverters, HVAC compressor drives, and industrial motor starters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for L6386ED includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The L6386ED belongs to ST's high-voltage gate driver product line, engineered specifically for robust, compact, and safety-aware power stage control in industrial motor drives and resonant converters.

FAQ

What is the maximum allowable dV/dt at the HVG pin without false triggering?

The L6386ED guarantees ±50 V/ns dV/dt immunity at the high-side output across its full operating temperature range (−45 °C to +125 °C), as verified per IEC 61800-3 test conditions. This specification applies with V_BOOT ≥ 14 V and proper PCB layout including minimized high-di/dt loop area and separation between power and signal traces.

Can the DIAG pin directly drive an optocoupler input without external buffering?

Yes - the DIAG pin is an open-drain output rated for 2.5 mA sink current at ≤0.8 V low-level voltage. It can directly drive common optocouplers such as PC817 or SFH615A when paired with a 4.7 kΩ pull-up resistor to 3.3 V or 5 V, enabling galvanically isolated fault reporting to microcontroller GPIOs.

How does the integrated bootstrap driver affect minimum on-time for the low-side switch?

The integrated bootstrap driver requires sufficient LVG-on time to fully recharge C_BOOT; for a 100 nF capacitor and 30 nC gate charge, ≥5 µs is recommended. At 100 kHz switching, this limits minimum low-side duty cycle to ~0.5%, making the device unsuitable for ultra-low-duty-cycle burst-mode operation without external bootstrap assist.

Is the L6386ED pin-compatible with earlier L6386E variants?

Yes - the L6386ED (SO-14) shares identical pinout, electrical characteristics, and functional behavior with the L6386E (DIP-14) variant. Only package type and packaging format differ; no schematic or layout changes are required when migrating from DIP-14 to SO-14 footprint.