STMicroelectronics STD80N450K6

Overview

STD80N450K6 from STMicroelectronics is an N-channel 800 V, 450 mΩ (max) superjunction Power MOSFET in DPAK (TO-252) package, designed for high-voltage flyback converters in notebook adapters and LED lighting. It delivers 10 A continuous drain current at T_C = 25 °C, features 17.3 nC total gate charge, 100% avalanche tested rating, and Zener-protected gate.

For engineers reviewing the STD80N450K6 datasheet, STD80N450K6 pinout, STD80N450K6 application, or STD80N450K6 equivalent, this device is selected for high-efficiency, space-constrained 800 V SMPS designs where low R_DS(on) × area and ultra-low Q_g directly reduce conduction and switching losses.

Technical Context

This MDmesh K6 MOSFET employs ST's 20-year superjunction architecture to achieve best-in-class figure of merit (R_DS(on) × Q_g) and on-resistance per die area. Its 800 V V_(BR)DSS withstands high-voltage transients in offline converters, while its 1.5 °C/W R_thJC enables high-power operation with minimal heatsinking.

The integrated source-drain diode exhibits 275 ns reverse recovery time (T_J = 25 °C) and 3.6 µC Q_rr, supporting fast, low-loss synchronous rectification in quasi-resonant topologies. Gate threshold voltage is tightly specified at 3–4 V (V_GS(th)), ensuring robust turn-on margin with standard 10 V gate drivers.

Key Specifications

Pinout & Package

DPAK (TO-252) package with exposed drain tab for thermal and electrical connection; surface-mount footprint optimized for high-current, high-voltage layout. Tab is electrically connected to drain (pin 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP80NF55-08 and IPP60R190C7, STD80N450K6 uniquely combines 800 V rating, Zener gate protection, and industry-leading FOM for universal-input flyback designs-making it irreplaceable where both voltage margin and power density are non-negotiable.

Availability

STD80N450K6 is available at Aetrix Electronics and suitable for flyback converter primary switches, notebook/tablet AC adapters, and industrial LED lighting drivers requiring stable component supply across multi-year production cycles.

Supply support for STD80N450K6 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, with design, manufacturing, and sales operations across Europe, Asia, and the Americas.

This device belongs to the MDmesh K6 high-voltage Power MOSFET product line, engineered specifically for high-efficiency, high-power-density offline SMPS in consumer, computing, and industrial power supplies.

FAQ

What is the maximum safe operating area (SOA) for STD80N450K6 at 100 °C case temperature?

At T_C = 100 °C, the continuous drain current is derated to 6 A (per Table 1). The SOA curve (Figure 1) shows that at 400 V V_DS, the device supports up to ~2.5 A for 10 ms pulses and ~0.8 A for 100 ms-limited by R_DS(on) conduction heating and thermal impedance. Operation beyond these boundaries risks thermal runaway or bond-wire failure.

Does STD80N450K6 require a gate resistor for EMI control in flyback applications?

Yes-a 4.7 Ω gate resistor is recommended (per Table 6 test conditions) to dampen ringing caused by L_g–C_iss resonance and limit peak di/dt during turn-on. This value balances switching speed (10.6 ns t_d(on)) and EMI suppression without excessive gate drive loss.

Can STD80N450K6 replace older MDmesh K5 devices in existing designs?

Yes-pin-to-pin compatible with MDmesh K5 variants in DPAK (e.g., STD80N400K5), offering identical footprint and improved R_DS(on) (−12%) and Q_g (−18%). No layout changes needed; gate drive voltage and biasing remain unchanged due to matched V_GS(th) range.

What is the significance of the "Zener-protected" feature in practical circuit design?

The integrated Zener diode clamps gate-source voltage to ±20 V, eliminating risk of gate oxide rupture during transient coupling or layout-induced overshoot. This removes the need for discrete 18 V gate zeners and associated series resistors-reducing BOM count, PCB area, and potential failure points in high-reliability power supplies.