Texas Instruments CSD18510Q5BT

Overview

CSD18510Q5BT from Texas Instruments is an N-channel 40-V NexFET™ power MOSFET in a VSON-CLIP (DNK) 5-mm × 6-mm package, featuring 0.79 mΩ R_DS(on) at V_GS = 10 V, 118 nC total gate charge, and avalanche-rated operation for high-efficiency DC-DC conversion and synchronous rectification.

For engineers reviewing the CSD18510Q5BT datasheet, CSD18510Q5BT pinout, CSD18510Q5BT application, or CSD18510Q5BT equivalent, this device is selected for high-current, low-loss switching in compact power stages where thermal resistance, logic-level drive compatibility, and robust unclamped inductive switching performance are critical design requirements.

Technical Context

This MOSFET employs a silicon-limited current rating of 300 A at T_C = 25°C and package-limited continuous drain current of 100 A, with a junction-to-case thermal resistance of 0.8°C/W enabling high-power density designs. Its gate threshold voltage of 1.7 V (typical) supports direct interfacing with 3.3-V and 5-V logic controllers.

The device exhibits low dynamic capacitances - C_iss = 11400 pF, C_oss = 1080 pF, C_rss = 551 pF - and fast switching characteristics: t_d(on) = 8 ns, t_r = 17 ns, t_d(off) = 44 ns, t_f = 15 ns - optimized for high-frequency synchronous buck converters and motor gate drivers.

Key Specifications

Pinout & Package

VSON-CLIP (DNK) 8-pin plastic package with exposed thermal pad; 5.00 mm × 6.00 mm footprint; top-side marked "CSD18510"; RoHS-exempt NiPdAu plating; MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRL1404ZPBF and CSD17579Q5A, CSD18510Q5BT delivers the lowest R_DS(on) in its class with verified avalanche ruggedness and thermal performance - making it the preferred choice for high-current, high-reliability 40-V power stages where efficiency, size, and transient robustness are jointly constrained.

Availability

CSD18510Q5BT is available at Aetrix Electronics and suitable for DC-DC conversion, motor control, and hot-swap applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and telecom OEMs.

Supply support for CSD18510Q5BT 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, delivering analog and embedded processing solutions across industrial, automotive, and communications markets.

CSD18510Q5BT belongs to TI's NexFET™ power MOSFET product line, engineered specifically for high-efficiency, high-density power conversion in servers, telecom infrastructure, and motor drives where low R_DS(on), fast switching, and thermal performance are prioritized.

FAQ

What is the maximum continuous drain current rating for CSD18510Q5BT at 25°C case temperature?

The CSD18510Q5BT has a silicon-limited continuous drain current of 300 A at T_C = 25°C, while its package-limited rating is 100 A. This dual rating reflects the die's intrinsic capability versus thermal and bond-wire constraints. For sustained operation, thermal design must ensure T_C remains ≤25°C to safely utilize the 300-A rating; otherwise, derating per the SOA curve is required. The CSD18510Q5BT datasheet specifies both values in Absolute Maximum Ratings Table 1.

Does CSD18510Q5BT support logic-level gate drive from a 3.3-V microcontroller?

Yes, CSD18510Q5BT supports logic-level gate drive from 3.3-V sources due to its typical V_GS(th) of 1.7 V and guaranteed minimum of 1.2 V. At V_GS = 4.5 V, it achieves R_DS(on) = 1.2 mΩ - sufficient for many medium-current applications. However, for lowest conduction loss (0.79 mΩ), a 10-V gate drive is recommended. The CSD18510Q5BT's gate charge profile confirms stable enhancement down to 3 V, making it compatible with 3.3-V FPGA I/O and ARM Cortex-M GPIOs.

What is the thermal resistance from junction to case (RθJC) for CSD18510Q5BT, and how does it impact heatsink selection?

The CSD18510Q5BT has a maximum R_θJC of 0.8°C/W, measured with the device mounted on a 1-in², 2-oz Cu pad. This low value enables direct thermal coupling to metal-core PCBs or bolt-down heatsinks. For example, with a 1.5°C/W heatsink and 100-W dissipation, junction temperature rise is only 20.4°C above case - well within the –55°C to 150°C operating range. The CSD18510Q5BT's R_θJC specification is validated per JEDEC JESD51-14 and is critical for accurate thermal modeling in high-power designs.

Is CSD18510Q5BT avalanche-rated, and what does that mean for circuit reliability?

Yes, CSD18510Q5BT is avalanche-rated with E_AS = 328 mJ (single-pulse, I_D = 81 A, L = 0.1 mH, R_G = 25 Ω). This means it can safely absorb inductive energy during unclamped turn-off events - such as MOSFET short-circuits or transformer leakage spikes - without failure. Unlike non-avalanche-rated devices, the CSD18510Q5BT eliminates need for external snubbers in many flyback or LLC designs, improving reliability and reducing BOM count. The CSD18510Q5BT's avalanche performance is production-tested per JEDEC JESD24-1.

What package type and pin configuration does CSD18510Q5BT use, and how does it differ from standard QFN?

CSD18510Q5BT uses the VSON-CLIP (DNK) package - a 5-mm × 6-mm 8-pin thermally enhanced variant of QFN with internal copper clips instead of wire bonds. Pins 1–4 and 7–8 are Drain terminals tied directly to the exposed thermal pad, Pin 5 is Gate, and Pin 6 is Source. This clip-bond architecture reduces parasitic inductance and improves current sharing versus standard wirebond QFNs. The CSD18510Q5BT's mechanical drawings (SLPS632, Section 7.1) confirm the DNK footprint and thermal pad dimensions for precise PCB layout.