STW18N60M2 MOSFET: 650V 18A N-Channel Power MOSFET Guide

Quick Answers: What is the STW18N60M2 and Its Key Specs?

The STW18N60M2 is an N-Channel Power MOSFET from STMicroelectronics, designed for high-voltage power switching. It features a 650V breakdown voltage (VDS), a continuous drain current of 18A at 25°C, and a typical on-resistance of 0.19Ω at VGS=10V and ID=9A. The device is housed in a TO-247 through-hole package and is currently in active lifecycle status with 99,999 units in stock at XAIPART. As of 2026-08-22, the price is $1.0023 per unit at quantities of 1000 or more.

This MOSFET belongs to ST's MDmesh M2 series, which uses advanced strip layout technology to achieve low on-resistance and reduced switching losses. Key specifications include a gate charge of 45nC, avalanche energy of 700mJ, and an operating junction temperature range of -55°C to +150°C. The junction-to-case thermal resistance is 0.6°C/W, ensuring efficient heat dissipation in high-power applications.

Typical applications include switch-mode power supplies (SMPS), power factor correction (PFC) circuits, high-frequency DC-DC converters, solar inverters, motor drives, and welding equipment. The device is RoHS compliant and available from XAIPART with a minimum order quantity of 1.

Technical Guide: How to Select, Design In, and Use the STW18N60M2

When designing with the STW18N60M2, start by verifying that the 650V breakdown voltage meets your maximum drain-source voltage requirements. The continuous drain current of 18A at 25°C should be derated for higher ambient temperatures; the datasheet provides a derating curve. For gate drive, use a VGS of 10V to achieve the lowest on-resistance (0.19Ω typical). The gate-source voltage rating is ±25V, so ensure your driver does not exceed this.

For thermal management, the TO-247 package has a junction-to-case thermal resistance of 0.6°C/W. Calculate the required heatsink based on your power dissipation and maximum junction temperature of 150°C. The device is not internally protected against overcurrent, so external current sensing and protection are necessary. A snubber circuit may be required to manage voltage spikes during switching transitions.

In hard-switching topologies, the low gate charge (45nC) reduces driver requirements and switching losses. The high avalanche energy (700mJ) ensures robustness against unclamped inductive spikes. For best performance, place the MOSFET close to the controller and use proper PCB layout techniques to minimize parasitic inductance.

Alternatives & Comparison: Drop-in Replacements for STW18N60M2

From the verified data, the only alternative listed is the STW18N60M2-1, which shares the same electrical specifications but differs in package (TO-262 vs TO-247). It is not pin-compatible, so it is not a drop-in replacement. Cross-brand options like Infineon's IPW60R070P6 or onsemi's FCH18N60 are mentioned in the FAQ but are not pin-compatible due to different pinouts. Always verify pin compatibility before substitution.

Summary: The STW18N60M2-1 is electrically identical but requires a PCB redesign due to the TO-262 package. For a true drop-in replacement, no alternative is provided in the verified data; cross-brand parts are not pin-compatible.

Industry Insight: Market Position, Lifecycle, and Supply Situation

The STW18N60M2 is currently in an active lifecycle status, indicating it is in full production and widely available. XAIPART holds 99,999 units in stock, ensuring immediate availability for orders. The pricing tiers show a volume discount: $1.7182 for 1 unit, $1.2409 for 10, $1.0977 for 100, $1.05 for 500, and $1.0023 for 1000+ units, as of 2026-08-22.

STMicroelectronics is a leading manufacturer of power semiconductors, and the MDmesh M2 series is well-established in the industry. The device's specifications align with current market demands for high-voltage, low-loss MOSFETs in power conversion applications. [DATA_NEEDED: market share data, competitor pricing, and lead times for a complete market analysis]

Trends & Outlook: What Buyers Should Watch

Buyers should monitor the ongoing trend toward higher efficiency and power density in power electronics. The STW18N60M2's low on-resistance (0.19Ω) and low gate charge (45nC) position it well for next-generation SMPS and PFC designs. The 650V rating provides headroom for evolving grid voltages and renewable energy systems.

As GaN and SiC devices gain traction, silicon MOSFETs like the STW18N60M2 remain cost-effective for many applications. The active lifecycle and stable pricing suggest continued availability. However, supply chain fluctuations can affect lead times; XAIPART's substantial stock mitigates this risk. For future designs, consider the package trend: TO-247 remains standard for through-hole, but surface-mount options like TO-262 may gain preference in automated assembly.

Buyers should also watch for potential upgrades within the MDmesh M2 series or successors with even lower RDS(on) and gate charge. Always verify pin compatibility when considering alternatives.