Texas Instruments CSD17327Q5A

Overview

CSD17327Q5A from Texas Instruments is a 30V, N-channel NexFET™ power MOSFET in a thermally enhanced 8-pin VSONP (DQJ) package, optimized as a control FET in synchronous buck converters. It delivers R_DS(on) = 9.9 mΩ at V_GS = 8 V and 12.5 mΩ at V_GS = 4.5 V, with ultralow gate charge (Q_g = 2.8 nC typ), enabling high-efficiency point-of-load regulation in networking and telecom systems.

For engineers reviewing the CSD17327Q5A datasheet, CSD17327Q5A pinout, CSD17327Q5A application, or CSD17327Q5A equivalent, key selection criteria include its 1.9°C/W junction-to-case thermal resistance, avalanche rating (E_AS = 45 mJ), and SON 5-mm × 6-mm footprint compatibility with space-constrained DC/DC designs requiring fast switching and low conduction loss.

Technical Context

This MOSFET employs a silicon-based planar trench process optimized for low Q_gd/Q_g ratio (0.8 nC / 2.8 nC), minimizing Miller-induced switching delay and improving hard-switching efficiency. Its transconductance (g_fs = 44 S) and threshold voltage (V_GS(th) = 1.6 V typ) support stable gate drive across –55°C to 150°C operating range.

The device integrates a body diode with V_SD = 0.85 V at I_SD = 11 A and t_rr = 14.6 ns, enabling robust synchronous rectification and unclamped inductive switching. Thermal design leverages direct die-to-pad conduction via exposed drain paddle, achieving R_θJC = 1.9°C/W under standard 1-inch² 2-oz Cu mounting.

Key Specifications

Pinout & Package

Package: VSONP (DQJ), 8-pin, 5.0 mm × 6.0 mm × 1.0 mm body with exposed drain paddle (pin 1–4 and 6–8 are source; pin 5 is gate; drain connected to bottom thermal pad).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CSD17327Q5A, CSD17573Q5A trades lower R_DS(on) for higher voltage rating and gate charge, while IRF7759L2TRPBF sacrifices thermal and switching performance for package compatibility-making CSD17327Q5A the optimal balance for high-frequency, high-current 30-V control FET roles.

Availability

CSD17327Q5A is available at Aetrix Electronics and suitable for networking point-of-load regulators, telecom VRMs, and server CPU core supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for CSD17327Q5A 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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-efficiency power conversion solutions.

The NexFET™ power MOSFET product line was designed specifically for high-frequency, high-current DC/DC conversion in data center, telecom, and computing infrastructure-emphasizing low Q_g, low R_DS(on), and superior thermal metrics.

FAQ

What is the maximum continuous drain current rating for CSD17327Q5A at T_C = 25°C?

The CSD17327Q5A supports a continuous drain current of 65 A when case temperature is maintained at 25°C, as specified in the Absolute Maximum Ratings table. This rating assumes ideal thermal management via the exposed drain paddle and is distinct from the 13 A rating at T_A = 25°C, which reflects ambient-limited operation. Designers must verify actual case temperature under load to apply this current capability safely in the CSD17327Q5A.

Does CSD17327Q5A require a gate resistor for stable operation in a 1-MHz synchronous buck converter?

Yes-TI recommends a gate resistor of 2 Ω (as used in dynamic characterization test conditions) to dampen ringing and control dV/dt during switching transitions of the CSD17327Q5A. This value balances switching speed (t_d(on) = 5.6 ns, t_f = 3.2 ns) against gate oscillation risk, especially given the CSD17327Q5A's low Q_gd and high g_fs. Layout-dependent parasitics may require fine-tuning between 1 Ω and 5 Ω.

Can CSD17327Q5A be used as a synchronous rectifier (low-side FET) in addition to its control FET role?

Yes-the CSD17327Q5A features a fully rated body diode with V_SD = 0.85 V at 11 A and t_rr = 14.6 ns, making it suitable as a synchronous rectifier in buck converters where low forward voltage and fast recovery reduce conduction and switching losses. Its R_DS(on) remains advantageous in both high-side and low-side positions, though gate drive sequencing must prevent shoot-through in the CSD17327Q5A.

What is the moisture sensitivity level (MSL) and peak reflow temperature for CSD17327Q5A?

The CSD17327Q5A carries an MSL Level-1 rating with unlimited floor life and a peak reflow temperature of 260°C, per JEDEC J-STD-020. This applies to its VSONP (DQJ) package with Sn lead finish. No bake preconditioning is required before assembly, and the CSD17327Q5A can be processed using standard Pb-free reflow profiles without moisture-related delamination risk.

How does the thermal resistance R_θJA of CSD17327Q5A vary with PCB copper area?

R_θJA for the CSD17327Q5A ranges from 51°C/W (with 1-inch² 2-oz Cu pad) to 131°C/W (minimum pad area), as shown in Figure 1 of the datasheet. Increasing copper area beyond 1 inch² yields diminishing returns; TI's recommended layout uses a 4.46 mm × 4.26 mm stencil opening and 5.9 mm × 6.0 mm PCB pattern to achieve the rated 51°C/W. Real-world R_θJA must be measured per board design-not assumed from the CSD17327Q5A datasheet value alone.