Diodes Incorporated ZXGD3107N8TC

Overview

ZXGD3107N8TC from Diodes Incorporated is a synchronous MOSFET controller in SO-8 package designed to replace Schottky diodes in isolated flyback and resonant converters. It implements proportional gate drive control with -10 mV turn-off threshold, 2 A peak source / 7 A peak sink gate current, and operates up to 500 kHz in both CrCM and CCM modes for high-efficiency AC-DC power supplies.

For engineers reviewing the ZXGD3107N8TC datasheet, ZXGD3107N8TC pinout, ZXGD3107N8TC application, or ZXGD3107N8TC equivalent, this device serves as a low-quiescent-current (1.79 mA typical) ideal rectifier driver optimized for PoE power devices, laptop adapters, and ATX server PSUs where body diode conduction loss reduction is critical.

Technical Context

The ZXGD3107N8TC uses a high-voltage differential amplifier to sense MOSFET drain-source voltage and trigger gate drive based on a programmable turn-off threshold (VT = -10 mV typical). Its proportional gate drive architecture dynamically adjusts VG in response to VDS, minimizing conduction loss while enabling zero-current turn-off.

It supports dual-mode operation (CrCM and CCM) with 70 ns turn-on propagation delay and 15 ns turn-off propagation delay. The controller's bias and reference currents (IBIAS = 0.56 mA, IREF = 1.23 mA at VCC = 10 V) set VT and gate drive strength, enabling precise optimization for specific MOSFET RDS(on) and switching frequency.

Key Specifications

Pinout & Package

Package: SO-8 (Surface-mount, 1.27 mm pitch, 4.90 mm × 6.00 mm body, 1.45 mm height, RoHS-compliant matte tin terminals).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous rectifier controller applications.

Compared with NCP4307DR2G and SiHP2110, the ZXGD3107N8TC offers programmable turn-off threshold and higher gate drive current, enabling superior efficiency optimization across diverse MOSFET RDS(on) values and switching frequencies up to 500 kHz-critical for high-density PoE and server PSU designs.

Availability

ZXGD3107N8TC is available at Aetrix Electronics and suitable for AC-DC adaptors, telecom power supplies, and laptop adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for ZXGD3107N8TC 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-efficiency power management solutions for consumer, industrial, and communications markets.

The ZXGD3107N8TC belongs to Diodes' synchronous rectifier controller product line, engineered specifically to replace Schottky diodes in isolated DC-DC converters-targeting efficiency gains in compact, high-frequency, low-noise power supplies.

FAQ

What is the recommended external resistor configuration for VCC = 12 V?

For VCC = 12 V, Diodes specifies RBIAS = 24 kΩ and RREF = 9.6 kΩ to achieve the nominal -10 mV turn-off threshold. These values source 0.56 mA into BIAS and 1.23 mA into REF, ensuring optimal gate drive strength and timing accuracy per DS37887 Rev. 2 Section 8.1.

Can ZXGD3107N8TC drive multiple parallel MOSFETs?

Yes-the GATE pin delivers up to 7 A peak sink current and 2 A peak source current, sufficient to drive two 30 V/5 mΩ MOSFETs (total Qg ≈ 60 nC) at 300 kHz with <20 ns rise/fall times. Layout must minimize shared gate loop inductance and use individual gate resistors.

How does the controller handle drain voltage ringing during primary-side MOSFET turn-off?

The ZXGD3107N8TC is susceptible to false triggering from drain ringing; Diodes recommends damping the primary snubber with an R-C network (e.g., 10 Ω + 100 pF) across the snubber diode, as shown in Figure 5 of DS37887, to suppress oscillations reflected to the secondary side.

Is ZXGD3107N8TC compatible with continuous conduction mode (CCM) flyback converters?

Yes-DS37887 explicitly confirms CCM operation support. In CCM, the controller maintains MOSFET enhancement throughout the entire secondary conduction period using proportional gate drive, reducing average V_DS to <50 mV and eliminating body diode forward voltage drop entirely.