STMicroelectronics STU3LN80K5

Overview

STU3LN80K5 from STMicroelectronics is an N-channel 800 V, 2.5 A high-voltage Power MOSFET in IPAK (TO-251) package, fabricated with MDmesh K5 vertical structure technology. It delivers 2.8 Ω typ. R_DS(on), 9.5 nC total gate charge, and 100% avalanche-tested ruggedness for high-efficiency switching in offline SMPS and industrial AC-DC converters.

For engineers reviewing the STU3LN80K5 datasheet, STU3LN80K5 pinout, STU3LN80K5 application, or STU3LN80K5 equivalent, key selection criteria include its ultra-low Q_g/R_DS(on) figure of merit, 50 V/ns MOSFET dv/dt ruggedness, Zener-protected gate, and 65 mJ single-pulse avalanche energy - critical for reliable operation in flyback and resonant converters.

Technical Context

This device employs ST's MDmesh K5 proprietary vertical superjunction architecture to achieve industry-leading R_DS(on) × area and FoM. Its 800 V breakdown voltage and 2.8 Ω typical on-resistance enable compact, high-power-density designs without sacrificing voltage margin.

The MOSFET integrates a monolithic gate Zener clamp (±30 V rating), supports 4.5 V/ns diode recovery dv/dt, and exhibits 265 ns reverse recovery time at 25 °C - enabling robust commutation in hard-switched topologies with fast-recovery output diodes.

Key Specifications

Pinout & Package

IPAK (TO-251) type C package: 3-pin surface-mount outline with exposed metal tab (Drain-connected) for enhanced thermal performance and mechanical stability. Tab is electrically connected to Drain (D).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP3N80K5 and STD3N80K5, the STU3LN80K5 offers superior thermal performance via IPAK's low-R_thJC and built-in gate Zener - making it optimal for compact, high-reliability industrial power stages where board area and transient immunity are critical.

Availability

STU3LN80K5 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial SMPS, LED drivers, and UPS inverter stages requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for STU3LN80K5 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

The MDmesh K5 product line targets high-efficiency, high-voltage power conversion - specifically engineered to replace older superjunction MOSFETs in 600–800 V applications demanding lowest R_DS(on) × Q_g and robust avalanche capability.

FAQ

What is the maximum continuous drain current for STU3LN80K5 at 100 °C case temperature?

The maximum continuous drain current is 1.6 A at T_C = 100 °C, as specified in Table 1 of DS9824 Rev 5. This derating reflects thermal limits imposed by the 2.08 °C/W R_thJC and 150 °C maximum junction temperature, ensuring safe operation without exceeding SOA boundaries.

Does STU3LN80K5 include integrated gate protection?

Yes - the device integrates a monolithic Zener diode between gate and source, clamping V_GS to ±30 V. This is confirmed in the "Features" section and validated by the absolute maximum rating of ±30 V in Table 1, eliminating need for external gate protection in most standard drive circuits.

Can STU3LN80K5 be used in zero-voltage switching (ZVS) topologies?

Yes - its 14 pF C_oss, 0.6 pF C_rss, and 20 pF Co(tr) enable efficient resonant turn-off. The 265 ns t_rr and 1.2 µC Q_rr at 25 °C support soft-switching in LLC and phase-shifted full-bridge designs operating up to 300 kHz, provided dead-time and resonant tank are properly tuned.

Is the IPAK package lead-free and RoHS-compliant?

Yes - ST certifies the IPAK (TO-251) type C package as ECOPACK2 compliant, meeting RoHS Directive 2011/65/EU and REACH SVHC requirements. Full environmental compliance data is published in ST's official ECOPACK documentation referenced in Section 4 of DS9824 Rev 5.