Texas Instruments CSD18504Q5AT

Overview

CSD18504Q5AT from Texas Instruments is a 40V N-channel NexFET™ power MOSFET in an 8-pin VSONP (DQJ) package, featuring 5.3 mΩ R_DS(on) at V_GS = 10 V, 7.7 nC total gate charge, and logic-level 4.5 V drive capability - optimized for high-efficiency DC-DC conversion and secondary-side synchronous rectification.

For engineers reviewing the CSD18504Q5AT datasheet, CSD18504Q5AT pinout, CSD18504Q5AT application, or CSD18504Q5AT equivalent, key selection criteria include its ultra-low Q_g/Q_gd, avalanche rating, thermal resistance (R_θJC = 2.0 °C/W), RoHS-exempt Sn lead finish, and compatibility with 7-inch tape-and-reel handling for automated assembly.

Technical Context

This device employs a silicon-based planar trench MOSFET structure optimized for low switching losses and high current density. Its gate threshold voltage (1.5–2.4 V) enables direct interface with 3.3 V and 5 V controllers, while the integrated body diode supports synchronous rectifier operation with 39 nC reverse recovery charge and 28 ns recovery time.

The VSONP-8 package features an exposed thermal pad soldered to PCB copper for efficient heat transfer, supporting continuous drain current up to 50 A (package-limited) and pulsed current up to 275 A. Thermal metrics are validated on 1-inch², 2-oz Cu FR4 per JEDEC JESD51-2.

Key Specifications

Pinout & Package

The CSD18504Q5AT uses an 8-pin VSONP (DQJ) plastic package measuring 5 mm × 6 mm × 1.1 mm max height, with an exposed thermal pad 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 power MOSFET applications.

Compared with IRLML6344TRPBF and DMN3025LFG-7, the CSD18504Q5AT uniquely balances 40 V rating, 5.3 mΩ conduction, 7.7 nC gate charge, and 50 A package current in a 5 mm × 6 mm footprint - making it optimal for high-density, high-efficiency 36–48 V industrial and telecom power stages where both voltage headroom and thermal performance are critical.

Availability

CSD18504Q5AT is available at Aetrix Electronics and suitable for DC-DC converters, battery motor control systems, and industrial solenoid drivers requiring stable component supply, long-term lifecycle support, and traceable sourcing for volume production.

Supply support for CSD18504Q5AT 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs with broad industrial, automotive, and communications reach.

The CSD18504Q5AT belongs to TI's NexFET™ power MOSFET product line, engineered specifically for high-frequency, high-efficiency power conversion in space-constrained applications where low Q_g, low R_DS(on), and robust thermal performance are mandatory.

FAQ

What is the maximum continuous drain current for CSD18504Q5AT at 100°C case temperature?

The CSD18504Q5AT supports 30 A continuous drain current at T_C = 100 °C, derived from its 50 A rating at 25 °C and normalized derating curve (Figure 4-12). This value assumes proper PCB thermal design with ≥1-inch² 2-oz Cu connected to the exposed thermal pad. Exceeding this current without adequate cooling risks junction temperature exceeding 150 °C and permanent device failure.

Does CSD18504Q5AT require a gate resistor, and what value is recommended?

Yes, CSD18504Q5AT requires an external gate resistor to control dV/dt and suppress oscillation. A 4.7 Ω to 10 Ω resistor is recommended for most 300–500 kHz DC-DC applications, balancing switching speed against EMI and shoot-through risk. The exact value depends on driver strength, layout parasitics, and system noise immunity requirements - TI's SLUA271 application note provides layout guidelines specific to the CSD18504Q5AT.

Can CSD18504Q5AT be used in parallel configurations, and what precautions apply?

Yes, CSD18504Q5AT can be paralleled to increase current capacity, but requires matched gate drive paths, symmetrical PCB routing, and individual gate resistors to ensure current sharing. Thermal coupling between devices must be minimized using separate thermal pads or spaced placement. TI recommends verifying stability under worst-case load transients, as parameter variation (especially V_GS(th)) may cause imbalance above 70% of total rated current.

What is the safe operating area (SOA) limitation for CSD18504Q5AT in linear mode operation?

The CSD18504Q5AT is not characterized for linear (ohmic) mode operation. Its SOA curve (Figure 4-10) defines safe pulsed operation only - continuous linear use risks thermal runaway due to negative temperature coefficient of R_DS(on). For analog pass applications, TI recommends dedicated LDOs or integrated hot-swap controllers instead of using CSD18504Q5AT outside its specified switching duty-cycle limits.

Is CSD18504Q5AT compatible with lead-free reflow profiles, and what is its MSL rating?

Yes, CSD18504Q5AT is qualified for lead-free reflow with a JEDEC MSL Level-1 rating (unlimited floor life at ≤30 °C/60% RH) and peak reflow temperature of 260 °C. Its Sn lead finish meets IPC-J-STD-020 requirements, and the VSONP package withstands standard 3-spike reflow profiles without delamination or voiding when using recommended stencil design (70% paste coverage on thermal pad) per TI's SLUA271.