Texas Instruments CSD16404Q5A

Overview

CSD16404Q5A from Texas Instruments is an N-channel NexFET™ power MOSFET in a 8-pin VSONP (DQJ) package, rated for 25 V drain-to-source voltage, 4.1 mΩ R_DS(on) at V_GS = 10 V and 20 A, and optimized as a control FET in high-frequency synchronous buck converters for telecom and computing point-of-load applications.

For engineers reviewing the CSD16404Q5A datasheet, CSD16404Q5A pinout, CSD16404Q5A application, or CSD16404Q5A equivalent, this device is selected for low gate charge (6.5 nC), ultralow Q_gd (1.7 nC), and thermal performance with R_θJC = 3.3°C/W - critical for compact, high-efficiency DC/DC designs requiring fast switching and minimal conduction loss.

Technical Context

The CSD16404Q5A employs a silicon-based trench-gate process to achieve ultralow gate charge and reduced Miller capacitance (C_rss = 62–80 pF), enabling high dV/dt immunity and efficient operation above 1 MHz in synchronous rectification topologies. Its threshold voltage of 1.4–2.1 V supports 4.5 V gate drive compatibility while maintaining robust noise margin.

Designed specifically for control-FET roles in multiphase VRMs, it features avalanche-rated ruggedness (E_AS = 80 mJ), integrated body diode with Q_rr = 20 nC and t_rr = 22 ns, and a thermally enhanced exposed-pad QFN package that requires PCB copper thermal pad connection for junction-to-case heat transfer.

Key Specifications

Pinout & Package

Package: VSONP (DQJ), 8-pin plastic no-lead package with 5 mm × 6 mm footprint and 1.1 mm max height; features exposed thermal pad (pin 5) requiring solder connection to PCB ground plane for thermal and mechanical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel control-FET applications.

Compared with BSC010N04LS and NTMFS4C023N, the CSD16404Q5A delivers optimal balance of low Q_g, controlled Q_gd, and avalanche ruggedness in a thermally efficient 5 mm × 6 mm footprint - making it preferred for high-frequency, high-reliability telecom and server control-FET applications where switching loss and transient robustness are co-critical.

Availability

CSD16404Q5A is available at Aetrix Electronics and suitable for telecom infrastructure, server VRMs, and AI accelerator board point-of-load converters requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.

Supply support for CSD16404Q5A 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 U.S.-based semiconductor company specializing in analog, embedded processing, and power management ICs, with leadership in high-efficiency power conversion technologies.

The CSD16404Q5A belongs to TI's NexFET™ power MOSFET product line, engineered specifically for high-frequency, high-current control-FET roles in synchronous buck converters targeting networking, telecom, and computing power delivery systems.

FAQ

What is the maximum continuous drain current for CSD16404Q5A at 25°C case temperature?

The CSD16404Q5A supports 81 A continuous drain current at T_C = 25°C, as specified in the Absolute Maximum Ratings table. This rating assumes ideal heatsinking via the exposed thermal pad and is derated to 21 A at T_A = 25°C ambient with standard JEDEC 2-oz. copper pad conditions. Real-world design must verify thermal margin using R_θJC = 3.3°C/W and actual board layout.

Does CSD16404Q5A require a gate resistor for safe operation in a 600 kHz synchronous buck converter?

Yes - while the CSD16404Q5A has low gate charge (6.5 nC), a gate resistor (typically 2–10 Ω) is required to dampen ringing, control slew rate, and prevent shoot-through during dead-time transitions. TI's evaluation data (Figure 4, G003) shows gate drive waveforms tested with R_G = 2 Ω; omitting this resistor risks oscillation and increased EMI in high-dV/dt applications.

Can CSD16404Q5A be used as a synchronous rectifier (sync-FET) instead of a control FET?

No - the CSD16404Q5A is optimized as a control FET with low Q_gd and fast turn-on, but its body diode Q_rr = 20 nC and t_rr = 22 ns are higher than dedicated sync-FETs. In synchronous rectifier position, this increases reverse recovery loss and cross-conduction risk. TI recommends pairing CSD16404Q5A with a dedicated low-Q_rr MOSFET (e.g., CSD16321Q5) for the low-side position.

What is the recommended PCB land pattern for CSD16404Q5A's thermal pad?

Texas Instruments specifies a 4.9 mm × 4.46 mm solder mask-defined thermal pad (F10 × F11 per M0138-01) with 70% solder paste coverage. The pad must be solidly connected to inner-layer ground planes via ≥6 thermal vias (0.3 mm diameter, 0.6 mm pitch) to achieve R_θJA ≤ 52°C/W. Slotted or segmented pads degrade thermal performance and are not recommended.

Is CSD16404Q5A suitable for automotive applications per AEC-Q101?

No - the CSD16404Q5A is not AEC-Q101 qualified. Its datasheet specifies an operating junction temperature range of –55°C to 150°C, but TI does not list it in their automotive-grade portfolio. For automotive 12 V DC/DC control-FET applications, consider AEC-Q101-qualified alternatives such as TI's CSD17573Q5B or Infineon's BSC014N04LS.