STMicroelectronics STL45N65M5

Overview

STL45N65M5 from STMicroelectronics is an N-channel 650 V, 22.5 A Power MOSFET based on MDmesh™ M5 vertical process technology in a PowerFLAT™ 8x8 HV package, featuring 0.075 Ω typ. R_DS(on), 82 nC total gate charge, and 160 W case power dissipation. It delivers high-efficiency switching in high-voltage AC-DC converters and industrial motor drives.

For engineers reviewing the STL45N65M5 datasheet, STL45N65M5 pinout, STL45N65M5 application, or STL45N65M5 equivalent, key selection criteria include avalanche ruggedness (810 mJ E_AS), low output capacitance energy (79 pF C_o(er)), fast diode recovery (346 ns t_rr at T_j = 25 °C), and thermal resistance of 0.78 °C/W (j-case).

Technical Context

This MOSFET employs ST's MDmesh™ M5 silicon architecture to achieve ultra-low conduction loss while maintaining robust 650 V blocking capability. Its 3470 pF C_iss and 7 pF C_rss support high-frequency hard-switching up to 100 kHz in PFC and resonant topologies.

The integrated source-drain diode exhibits 1.5 V forward voltage at 22.5 A and controlled reverse recovery (Q_rr = 6 µC, I_RRM = 35 A), enabling reduced snubber losses in bridge-leg configurations without external diode replacement.

Key Specifications

Pinout & Package

STL45N65M5 uses the PowerFLAT™ 8x8 HV package - a surface-mount, exposed-drain, thermally enhanced leadless package with 8 mm × 8 mm footprint and 0.85 mm nominal height. The drain is connected to the bottom-side thermal pad; source and gate are on the top side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IPA60R190P7 and FCH067N65S3, STL45N65M5 uniquely balances 650 V robustness, 0.075 Ω conduction loss, 82 nC gate charge, and certified 810 mJ avalanche energy - making it optimal for compact, high-reliability industrial and renewable energy converters where thermal density and fault tolerance are co-constrained.

Availability

STL45N65M5 is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, solar microinverters, and EV onboard chargers requiring stable component supply across multi-year production cycles.

Supply support for STL45N65M5 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 for automotive, industrial, and power applications.

This device belongs to ST's MDmesh™ M5 high-voltage power MOSFET product line, engineered specifically for high-efficiency, high-power-density switched-mode power supplies and motor control inverters operating at 600–650 V.

FAQ

What is the maximum recommended gate-source voltage for reliable operation?

The absolute maximum V_GS is ±25 V per datasheet Table 2. For long-term reliability, ST recommends limiting continuous V_GS to ≤20 V and transient spikes to ≤22 V. Exceeding 25 V risks irreversible gate oxide breakdown, especially at elevated junction temperatures above 125 °C.

Can STL45N65M5 replace older MDmesh™ M2 or M3 devices in existing designs?

Yes - STL45N65M5 is pin-compatible with earlier STLxxN65M2/M3 variants in PowerFLAT™ 8x8 HV, offering lower R_DS(on) (0.075 Ω vs. 0.095 Ω typical) and improved E_AS (810 mJ vs. 520 mJ). No layout change is needed, but gate drive strength should be verified due to higher Q_g (82 nC vs. 65 nC).

Is the source-drain diode suitable for synchronous rectification without external Schottky?

No - while the body diode is optimized for low Q_rr and soft recovery, its 1.5 V forward drop at 22.5 A causes significantly higher conduction loss than a 45 V Schottky. It is intended for freewheeling and fault handling, not primary rectification in low-voltage outputs.

What PCB layout practices are critical for thermal performance?

Thermal pad soldering must cover ≥90% of the 7.2 mm × 7.2 mm bottom-side drain area with ≥2 oz Cu and ≥6 thermal vias (0.3 mm diameter, 0.8 mm pitch) connecting to inner-layer ground or dedicated thermal planes. Keep gate traces short and shielded from drain dv/dt noise to prevent false turn-on.