Texas Instruments CSD17302Q5A

Overview

CSD17302Q5A from Texas Instruments is a 30V, N-channel NexFET™ power MOSFET in a thermally enhanced 5-mm × 6-mm SON package, optimized for 5V gate drive. It delivers R_DS(on) = 7.3 mΩ at V_GS = 4.5V and I_D = 14A, with ultralow Q_g = 5.4 nC and Q_gd = 1.2 nC - enabling high-efficiency synchronous buck conversion in notebook and telecom point-of-load applications.

For engineers reviewing the CSD17302Q5A datasheet, CSD17302Q5A pinout, CSD17302Q5A application, or CSD17302Q5A equivalent, key selection criteria include its 1.8°C/W junction-to-case thermal resistance, avalanche rating (E_AS = 61 mJ), RoHS-compliant Pb-free plating, and validated performance under 125°C case temperature conditions.

Technical Context

This MOSFET employs a trench-gate silicon process optimized for low gate charge and fast switching in DC-DC converters. Its dynamic characteristics - including C_iss = 950 pF (typ), C_oss = 510 pF (typ), and Cr_ss = 45 pF (max) - support stable operation in high-frequency synchronous buck topologies up to 1 MHz.

The device integrates an intrinsic body diode with V_SD = 0.85 V (typ) at I_SD = 14A and Q_rr = 15.4 nC, enabling efficient reverse recovery in hard-switched and synchronous rectification modes without external Schottky supplementation.

Key Specifications

Pinout & Package

Package: VSONP (DQJ), 8-pin, 5 mm × 6 mm plastic QFN with exposed thermal pad. Pin 1 marked by notch or dot; bottom-side thermal pad soldered for optimal heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CSD17302Q5A, CSD17573Q5A trades conduction loss for faster switching, while IRF7759L2TRPBF sacrifices thermal capability and ruggedness for package compatibility - making CSD17302Q5A the balanced choice for 14A+ 5V-gate POL systems demanding reliability and density.

Availability

CSD17302Q5A is available at Aetrix Electronics and suitable for notebook point-of-load, networking synchronous buck, and telecom baseband POL applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for CSD17302Q5A 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 ICs, with decades of leadership in power MOSFET innovation and automotive-grade reliability validation.

The NexFET™ power MOSFET product line - including CSD17302Q5A - was engineered specifically for high-efficiency, high-density DC-DC conversion in computing, networking, and portable electronics, emphasizing low Q_g, thermal performance, and 5V logic compatibility.

FAQ

What is the maximum continuous drain current for CSD17302Q5A at 125°C case temperature?

The CSD17302Q5A supports 16 A continuous drain current at T_C = 25°C, derating linearly to approximately 11.5 A at T_C = 125°C per the datasheet's thermal curves. This value is confirmed by the Absolute Maximum Ratings table and validated by the "Maximum Drain Current vs. Temperature" graph (Figure 12), where CSD17302Q5A maintains safe operation up to 150°C junction temperature under defined PCB copper area conditions.

Does CSD17302Q5A require a gate resistor for stability in synchronous buck applications?

Yes - although CSD17302Q5A has low gate charge, a series gate resistor (typically 1–5 Ω) is recommended to dampen ringing caused by parasitic inductance between driver and gate. The datasheet's switching time test conditions specify R_G = 2 Ω, and TI application note SLPA005 confirms that improper gate loop layout without resistance increases EMI and risks oscillation, especially at >500 kHz switching frequencies.

Is CSD17302Q5A suitable for use as a high-side switch in a floating gate-drive configuration?

No - CSD17302Q5A is optimized as a low-side switch with source-connected to ground reference. Its V_GS rating (+10 V / –8 V) and lack of level-shifted gate driver integration make it unsuitable for high-side operation without external bootstrap or isolated gate drive circuitry. For high-side use, TI recommends complementary devices like CSD17312Q5A or dedicated high-side controllers.

What is the thermal pad soldering requirement for CSD17302Q5A to achieve R_θJC = 1.8°C/W?

To achieve the specified 1.8°C/W junction-to-case thermal resistance, the CSD17302Q5A's exposed thermal pad must be soldered to a minimum 1-inch² (6.45 cm²) 2-oz copper pad on the PCB, with ≥4 thermal vias (0.3 mm diameter, filled or plated) connecting directly to inner ground planes. TI's mechanical drawing M0135-01 and application note SLPA005 define this as the reference layout condition for all thermal ratings.

Can CSD17302Q5A replace older SO-8 MOSFETs like Si4800BD in existing designs?

No direct replacement - CSD17302Q5A uses a 5×6 mm QFN (VSONP) package incompatible with SO-8 footprints. While electrical specs (R_DS(on), Q_g) are superior, board redesign is required for pad layout, thermal via placement, and solder stencil aperture. TI does not list CSD17302Q5A as pin-compatible with Si4800BD; migration requires full layout validation per SLPA005 guidelines.