Texas Instruments CSD16321Q5T

Overview

CSD16321Q5T from Texas Instruments is a 25V N-channel NexFET™ power MOSFET in a VSON-CLIP (DQH) 8-pin package, optimized for 5V gate drive in high-efficiency synchronous buck converters. It delivers 1.9mΩ R_DS(on) at V_GS = 8V, 14nC total gate charge, and 100A continuous drain current (package-limited), targeting point-of-load regulation in telecom and computing infrastructure.

For engineers reviewing the CSD16321Q5T datasheet, CSD16321Q5T pinout, CSD16321Q5T application, or CSD16321Q5T equivalent, this device is selected for low-loss, high-current switching where thermal resistance (R_θJC = 1.1°C/W) and avalanche ruggedness (218mJ E_AS) are critical to system reliability under transient stress.

Technical Context

This MOSFET uses TI's NexFET™ silicon technology with optimized cell layout to minimize Q_g (14nC) and Q_gd (2.5nC), enabling fast switching with reduced drive loss. Its low R_DS(on) across V_GS = 3–8V ensures stable conduction in 5V-controlled synchronous FET stages.

The VSON-CLIP (DQH) package integrates an exposed thermal pad and copper clip interconnects, achieving 1.1°C/W junction-to-case thermal resistance and supporting 113W power dissipation at T_C = 25°C - critical for compact, high-power-density DC/DC designs.

Key Specifications

Pinout & Package

VSON-CLIP (DQH) 8-pin plastic package with exposed thermal pad; 5.0mm × 6.0mm footprint and 1.05mm max height. Requires soldering of thermal pad to PCB for rated thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel power MOSFET applications.

Compared with CSD16321Q5T, the BSC010N04LS offers higher voltage headroom but demands higher gate voltage, while the NTMFS4C026P fits legacy SO-8 layouts but sacrifices thermal performance and conduction efficiency - making CSD16321Q5T optimal for space-constrained, 5V-driven POL systems demanding lowest R_DS(on) and fastest switching.

Availability

CSD16321Q5T is available at Aetrix Electronics and suitable for telecom base station power supplies, server VRMs, and networking ASIC rails requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for CSD16321Q5T 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

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management technologies, with leadership in high-efficiency power conversion solutions.

The CSD16321Q5T belongs to TI's NexFET™ power MOSFET product line, engineered specifically for high-frequency, high-current synchronous buck converters in data center, telecom, and computing infrastructure.

FAQ

What is the maximum continuous drain current rating for CSD16321Q5T at 25°C ambient?

The CSD16321Q5T has a package-limited continuous drain current (I_D) of 100A at T_A = 25°C, as specified in its Absolute Maximum Ratings table. This rating assumes proper PCB thermal design with ≥1in² of 2oz copper. Silicon-limited current is higher (177A), but thermal constraints govern practical operation. Always verify board layout and airflow in final design to maintain safe junction temperature.

Does CSD16321Q5T support 3.3V gate drive, and what is its R_DS(on) at that voltage?

Yes, CSD16321Q5T is characterized down to 3V gate drive and specifies 2.8mΩ R_DS(on) at V_GS = 3V and I_D = 25A. Its 1.1V typical V_GS(th) ensures strong turn-on with 3.3V logic, though conduction loss increases ~47% versus operation at 8V. For best efficiency, use 4.5V–8V drive where possible.

What is the recommended PCB layout for the thermal pad of CSD16321Q5T?

The CSD16321Q5T thermal pad must be soldered to a solid copper plane - TI recommends ≥1in² of 2oz copper for optimal R_θJA = 50°C/W. The datasheet provides land pattern, stencil, and via guidelines (SLUA271 reference). Avoid solder mask over the pad; use 71% paste coverage and optional thermal vias to inner layers for enhanced heat spreading in high-power applications.

Is CSD16321Q5T suitable for avalanche operation, and what is its rated energy?

Yes, CSD16321Q5T is fully avalanche-rated with E_AS = 218mJ (single-pulse, I_D = 66A, L = 0.1mH, R_G = 25Ω). This rating validates its robustness during unclamped inductive switching events, such as controller timing faults or output short-circuits. No external snubber is required for typical synchronous buck fault conditions.

What is the gate-to-source leakage current specification for CSD16321Q5T?

The CSD16321Q5T specifies I_GSS ≤ 100nA at V_GS = ±8V and V_DS = 0V, per its Electrical Characteristics table. This low leakage supports stable gate bias in high-impedance drive circuits and ensures minimal power loss in always-on control configurations, such as power sequencers or enable monitoring networks.