STMicroelectronics L6395D

Overview

L6395D from STMicroelectronics is a high-voltage, dual-channel gate driver IC for N-channel MOSFETs and IGBTs in half-bridge configurations. It integrates high-side (600 V rail) and low-side drivers with TTL/CMOS-compatible 3.3 V/5 V inputs, ±50 V/ns dV/dt immunity, and an integrated bootstrap diode. Used in motor control stages of home appliance inverters.

For engineers reviewing the L6395D datasheet, L6395D pinout, L6395D application, or L6395D equivalent, key selection criteria include bootstrap voltage handling (up to 620 V), asymmetric drive capability (290 mA source / 430 mA sink), fast switching (75 ns rise / 35 ns fall @ 1 nF), UVLO thresholds on both VCC and VBO rails, and SO-8 thermal performance (R_th(JA) = 150 °C/W).

Technical Context

The L6395D implements a floating high-side structure using BCD™ "offline" technology, enabling operation with V_OUT up to 580 V referenced to GND. Its level shifter and bootstrap driver are synchronized to LVG, eliminating external diodes while maintaining <1 V gate discharge during off-state.

Logic inputs feature hysteresis (V_IL = 0.8–1.1 V, V_IH = 1.9–2.25 V), supporting direct interfacing with 3.3 V microcontrollers. UV detection operates independently on VCC (9.5 V turn-on, 0.7 V hysteresis) and V_BO (8.6 V turn-on, 0.6 V hysteresis), ensuring robust fault protection during startup and transient conditions.

Key Specifications

Pinout & Package

Package: SO-8 (ECOPACK® compliant), surface-mount, 150 °C/W junction-to-ambient thermal resistance, 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR2104S and UCC27211D, the L6395D uniquely combines integrated bootstrap, dual-rail UVLO, and ±50 V/ns dV/dt immunity in SO-8 - making it optimal for cost-sensitive, reliability-critical 100–1500 W motor drives where board area and component count matter.

Availability

L6395D is available at Aetrix Electronics and suitable for washing machine inverters, industrial conveyor motor controllers, and HVAC blower modules requiring stable component supply across extended production lifecycles.

Supply support for L6395D 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 industrial, automotive, and consumer markets.

The L6395D belongs to ST's high-voltage gate driver product line, engineered specifically for robust, compact half-bridge motor control in home appliance and factory automation applications.

FAQ

What is the maximum allowable bootstrap capacitor voltage drop during continuous operation?

The L6395D's internal bootstrap DMOS has R_DS(on) ≈ 120 Ω. For a 30 nC gate charge and 5 µs charging time, voltage drop is ~0.7 V (calculated per Equation 4). Total C_BOOT droop must stay below V_{BO_thOFF} – V_{BO_thON} (≈ 0.6 V margin), so design C_BOOT ≥ 100 nF with low-ESR ceramic dielectric and minimize leakage paths.

Can L6395D drive IGBTs directly without external components?

Yes - the L6395D's 430 mA sink current and 290 mA source current meet standard IGBT gate drive requirements for devices rated ≤ 25 A/600 V. No external gate resistors are mandatory, but a 10–22 Ω series resistor on HVG/LVG is recommended to damp ringing and limit peak current during Miller plateau crossing.

How does the dual UVLO protect the system during brown-out conditions?

The L6395D monitors VCC and V_BO independently. If either rail drops below its UVLO threshold (e.g., VCC < 8.8 V or V_BO < 8.0 V), both LVG and HVG outputs are forced low within 1 µs. This prevents partial turn-on of power devices, eliminating shoot-through and thermal runaway during unstable supply conditions.

Is the SO-8 package thermally adequate for 800 kHz switching at full load?

At T_A = 25 °C, R_th(JA) = 150 °C/W limits continuous power dissipation to ~800 mW. With typical 200 mW total loss at 800 kHz (including switching and conduction), junction temperature rise is ~30 °C - well within the 125 °C max operating limit. For sustained high-temp ambient (>70 °C), add copper pour and thermal vias under pins 3, 4, and 5.