STMicroelectronics STL18N65M2

Overview

STL18N65M2 from STMicroelectronics is an N-channel 650 V, 8 A Power MOSFET in PowerFLAT 5x6 HV package, featuring 0.290 Ω typ. R_DS(on), 20 nC total gate charge, and 100% avalanche tested. It serves as a high-voltage switching device in offline SMPS primary-side circuits, PFC stages, and industrial DC-DC converters requiring robustness at 715 V_DS rating.

For engineers reviewing the STL18N65M2 datasheet, STL18N65M2 pinout, STL18N65M2 application, or STL18N65M2 equivalent, key selection criteria include its MDmesh M2 strip layout enabling low C_oss (35 pF), Zener-protected gate, and 150 °C max junction temperature-critical for high-efficiency, high-reliability power conversion designs.

Technical Context

This MOSFET employs ST's MDmesh M2 technology with optimized vertical structure and strip layout to simultaneously reduce R_DS(on) and output capacitance. Its 175 pF C_oss,eq (energy-related) and 15 V/ns diode recovery dv/dt capability support fast, low-loss hard-switching operation.

The device integrates a Zener-protected gate and exhibits 120 mJ single-pulse avalanche energy (E_AS) at 50 V, with safe operating area validated up to 100 µs pulse width at 25 °C. Thermal resistance junction-to-case is 2.2 °C/W, enabling high-power density mounting on compact PCBs.

Key Specifications

Pinout & Package

STL18N65M2 uses the PowerFLAT 5x6 HV surface-mount package (8.0 mm × 6.0 mm × 1.0 mm), with exposed drain pad for thermal enhancement and optimized for high-current PCB routing. The package complies with ECOPACK environmental standards and is supplied in tape-and-reel format (3000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage power switching applications.

Compared with IPW65R041CFD7, STL18N65M2 trades 11% lower conduction loss for 59% lower gate charge and surface-mount compatibility; versus STP18N65M2, it delivers 62% lower thermal resistance and eliminates through-hole reflow challenges-making it optimal for high-power density, automated production.

Availability

STL18N65M2 is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, server rectifiers, and renewable energy inverters requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STL18N65M2 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, designing and manufacturing analog, digital, and mixed-signal ICs and discrete devices for automotive, industrial, and power applications.

This device belongs to ST's MDmesh™ M2 high-voltage Power MOSFET product line, engineered specifically for high-efficiency, high-reliability switching in offline SMPS, PFC, and industrial motor drives.

FAQ

What is the maximum recommended gate resistor value for reliable switching?

A 4.7 Ω gate resistor is validated in the datasheet test circuit for resistive load switching. Using >10 Ω increases turn-off delay (t_d(off) = 46 ns typ.) and fall time (t_f = 12.5 ns typ.), risking shoot-through in half-bridge configurations. For 100 kHz+ operation, 2.2–4.7 Ω is optimal to balance switching speed and gate oscillation damping.

Does the body diode support continuous conduction mode (CCM) in synchronous rectification?

No-the integrated body diode is rated for pulsed source-drain current (I_SDM = 32 A) with 300 µs pulse width and 1.5% duty cycle. Its 331 ns reverse recovery time and 3.4 µC Q_rr make it unsuitable for sustained CCM synchronous rectification; external Schottky or MOSFET-based synchronous rectifiers are required.

How does the PowerFLAT 5x6 HV package affect PCB thermal design?

The exposed drain pad must be connected to ≥1 inch² of 2 oz copper with ≥6 thermal vias (0.3 mm diameter, 0.8 mm pitch) to achieve the specified 2.2 °C/W R_thj-case. Without this, junction temperature rises >25 °C at 5 A, violating the 150 °C T_J limit. FR-4 board alone yields 59 °C/W R_thj-amb.

Is avalanche capability tested per unit or lot-sampled?

Each STL18N65M2 unit undergoes 100% production avalanche testing per ST's internal qualification protocol, verifying minimum 120 mJ E_AS at 50 V. This is documented in the DS10248 Rev 4 datasheet Section 1, Table 1, and replaces statistical lot sampling used in earlier generations.