Diodes Incorporated ZXGD3112N7TC

Overview

ZXGD3112N7TC from Diodes Incorporated is a 400V active OR-ing MOSFET controller in SO-7 package, designed to drive low-R_DS(ON) N-channel MOSFETs as ideal diodes in high- or low-side power supply units. It features a -3mV turn-off threshold (±2mV tolerance), <600ns turn-off time, and supports ±400V rail operation - enabling >99% efficiency improvement over Schottky rectifiers in telecom redundant PSUs.

For engineers reviewing the ZXGD3112N7TC datasheet, ZXGD3112N7TC pinout, ZXGD3112N7TC application, or ZXGD3112N7TC equivalent, this controller is selected for fault-tolerant DC bus protection where reverse-current blocking speed, ultra-low quiescent current (<1mA), and ±400V drain voltage capability are critical design requirements.

Technical Context

The ZXGD3112N7TC integrates a precision differential amplifier with a high-current gate driver to monitor V_DS across an external MOSFET. Its comparator detects sub-millivolt drain-source voltage changes relative to GND/PGND, triggering gate drive action when V_DS crosses the -3mV threshold.

It operates with V_CC from 4V to 20V (rated 25V max), clamps gate output at 12V when V_CC >12V, and delivers 3.3A peak sink / 0.66A peak source current into 47nF load - enabling fast MOSFET switching with programmable t_R/t_F via external R_G.

Key Specifications

Pinout & Package

SO-7 package with exposed thermal pad on pins 5–6 (PGND) and pin 3 (V_CC). Molded plastic case meets UL 94V-0; moisture sensitivity level 1 per J-STD-020. Matte tin-plated leads ensure solderability per MIL-STD-202, Method 208.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar active OR-ing MOSFET controller applications.

Compared with LM5050-1MK/NOPB and TPS2412DR, the ZXGD3112N7TC uniquely supports ±400V operation with sub-millivolt threshold sensing and external MOSFET flexibility - making it the only viable choice for telecom, data center, and industrial high-voltage OR-ing.

Availability

ZXGD3112N7TC is available at Aetrix Electronics and suitable for telecom redundant PSUs, data center server rails, and industrial 200V DC distribution systems requiring stable component supply, long lifecycle assurance, and RoHS-compliant sourcing.

Supply support for ZXGD3112N7TC 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Malaysia, and Taiwan.

The ZXGD series targets high-efficiency power-path control, specifically engineered for ideal diode replacement in mission-critical redundant power architectures - emphasizing speed, voltage range, and thermal resilience.

FAQ

What is the maximum recommended MOSFET R_DS(ON) for optimal performance with ZXGD3112N7TC?

The ZXGD3112N7TC does not impose a hard R_DS(ON) limit but achieves best efficiency with MOSFETs having R_DS(ON) ≤ 2mΩ at V_GS = 10V. At 20A load, such devices yield <10mV forward drop - well below the -3mV turn-off threshold - ensuring stable conduction without oscillation. Larger R_DS(ON) increases conduction loss and may reduce noise margin in high-dI/dt environments.

Can ZXGD3112N7TC be used in high-side configuration with +400V rail without additional level-shifting circuitry?

Yes - the DRAIN pin is electrically isolated from GND and rated for -3V to +400V, allowing direct connection to +400V MOSFET drains. V_CC must be derived from a separate auxiliary supply (e.g., HV-to-12V regulator), as the IC itself does not generate bias from the high-voltage rail. The SO-7 package's creepage/clearance meets reinforced insulation requirements for 400V operation.

How does the ZXGD3112N7TC handle simultaneous turn-on of multiple OR-ing controllers on the same bus?

No synchronization or communication is required. Each ZXGD3112N7TC independently controls its MOSFET based on local V_DS. During startup, body diode conduction establishes initial bus voltage; then all controllers detect forward bias and enhance their MOSFETs in parallel. Load sharing depends on MOSFET R_DS(ON) matching and PCB trace resistance - not controller interaction.

Is external gate resistor (R_G) mandatory, and how does it affect switching behavior?

An external R_G is optional but recommended to dampen gate ringing and control dV/dt during turn-on. Values from 1Ω to 10Ω are typical. Lower R_G reduces t_R but increases EMI risk; higher R_G slows turn-on and raises conduction loss during transition. The IC's 3.3A sink capability ensures reliable turn-off regardless of R_G value, as gate discharge is not resistor-limited.