STMicroelectronics STL11N4LLF5

Overview

STL11N4LLF5 from STMicroelectronics is an N-channel 40 V Power MOSFET in PowerFLAT™ 3.3 × 3.3 package, optimized for high-efficiency switching with 9.1 mΩ typ. R_DS(on) at V_GS = 10 V, 15 A continuous drain current (T_pcb = 25 °C), and 12.9 nC total gate charge. It delivers high avalanche ruggedness and low switching losses in compact DC-DC converters and motor control stages.

For engineers reviewing the STL11N4LLF5 datasheet, STL11N4LLF5 pinout, STL11N4LLF5 application, or STL11N4LLF5 equivalent, key selection criteria include its 40 V V_DS, 9.7 mΩ max R_DS(on), 44 A pulsed drain current, thermal resistance of 42.8 °C/W (j-pcb, transient), and compatibility with 4.5 V logic-level gate drive in space-constrained power stages.

Technical Context

This MOSFET employs ST's STripFET™V process to minimize conduction and switching losses simultaneously. Its low Q_g (12.9 nC) and Q_gd/Q_g ratio (~41%) support fast, controllable turn-on/turn-off with reduced Miller-induced oscillation risk.

The device features a robust body diode with t_rr = 27.2 ns and Q_rr = 24.5 nC at T_j = 150 °C, enabling reliable synchronous rectification and inductive load switching without external freewheeling diodes in many mid-power topologies.

Key Specifications

Pinout & Package

STL11N4LLF5 uses the PowerFLAT™ 3.3 × 3.3 surface-mount package with exposed drain pad on bottom for thermal and electrical connection. The package has three terminals: Drain (D), Source (S), and Gate (G), arranged in a single-row configuration with G–S–D pin order when viewed from top with marking side up and orientation notch at top-left.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BSC014N04LS and NTMFS4C02N, STL11N4LLF5 offers the best balance of low R_DS(on), moderate Q_g, and strict pinout compatibility - making it optimal for cost-sensitive, space-limited upgrades of existing PowerFLAT™-based designs without layout changes.

Availability

STL11N4LLF5 is available at Aetrix Electronics and suitable for DC-DC converters, BLDC motor drives, USB-C power path switches, and hot-swap modules requiring stable component supply and long-term industrial lifecycle support.

Supply support for STL11N4LLF5 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing capabilities.

This device belongs to ST's STripFET™V Power MOSFET product line, engineered specifically for high-efficiency, high-density power conversion in consumer, industrial, and computing applications where thermal performance and gate drive simplicity are critical.

FAQ

What is the maximum recommended PCB copper area for thermal performance?

The datasheet specifies thermal resistance R_thj-pcb = 42.8 °C/W for a 1 in² (645 mm²), 2 oz Cu FR-4 board. For optimal performance, ST recommends a minimum 200 mm² exposed drain pad connected to internal/external copper planes via ≥6 thermal vias (0.3 mm diameter). Larger copper areas further reduce junction temperature but yield diminishing returns beyond 400 mm².

Can STL11N4LLF5 be used in a high-side switch configuration with 3.3 V microcontroller drive?

Yes - its V_GS(th) range (1–2.5 V) and guaranteed R_DS(on) ≤ 12 mΩ at V_GS = 4.5 V enable full enhancement with 3.3 V logic. However, a gate resistor (10–22 Ω) and local 3.3 V bypass capacitor (100 nF) are required to suppress ringing and ensure stable switching at >100 kHz.

Does this MOSFET require external gate protection?

Yes - although rated for ±20 V V_GS, the gate oxide is susceptible to ESD damage. ST recommends a 10 kΩ pull-down resistor and bidirectional TVS diode (e.g., SMAJ5.0A) between gate and source. Layout must minimize gate loop inductance to prevent voltage overshoot during fast switching.

What is the safe operating area (SOA) limitation at 100 °C case temperature?

At T_C = 100 °C, the continuous drain current is derated to 6.8 A (per Table 2). The SOA curve (Figure 2) shows that pulse operation remains viable up to 44 A for ≤10 ms at V_DS ≤ 20 V, provided peak junction temperature stays below 150 °C and transient thermal impedance is managed via adequate PCB copper mass.