STMicroelectronics STP12NK80Z

Overview

STP12NK80Z from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 800 V drain-source voltage, 585 mΩ typical R_DS(on), and 10.5 A continuous drain current at T_C = 25 °C in TO-220 package. It delivers high dv/dt capability (4.5 V/ns), 100% avalanche tested ruggedness, and low gate charge (87 nC) for hard-switching in offline SMPS and industrial motor drives.

For engineers reviewing the STP12NK80Z datasheet, STP12NK80Z pinout, STP12NK80Z application, or STP12NK80Z equivalent, key selection criteria include its 800 V blocking rating, avalanche energy rating (400 mJ), Zener-protected gate, and thermal resistance (R_thJC = 0.66 °C/W) - all critical for high-reliability flyback, PFC, and half-bridge topologies operating at elevated ambient temperatures.

Technical Context

This device employs ST's SuperMESH process - an evolution of PowerMESH - to reduce on-resistance while maintaining robust safe operating area (SOA) and fast diode recovery (t_rr = 635 ns). Its intrinsic capacitances (C_iss = 2620 pF, C_oss = 250 pF, C_rss = 53 pF) are optimized for reduced switching losses in high-voltage DC-DC converters.

The integrated source-drain diode supports synchronous rectification and inductive load commutation with I_SD = 10.5 A and V_SD = 1.6 V at 10.5 A. Gate threshold voltage (3.0–4.5 V) ensures stable turn-on under wide V_GS supply tolerances, and ESD rating (4 kV HBM) enables handling without special precautions.

Key Specifications

Pinout & Package

STP12NK80Z is housed in a through-hole TO-220 package with isolated tab (pin 2), where the drain connects directly to the metal tab for low-inductance heat sinking. The package complies with ECOPACK environmental standards and features 3.75–3.85 mm mounting hole diameter.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STW12NK80Z, STP12NK80Z offers identical electrical specs but lower mounting profile and simpler mechanical integration; versus FDPF12N80, it trades minor R_DS(on) advantage for built-in gate protection and guaranteed avalanche ruggedness - critical for field-reliable industrial designs.

Availability

STP12NK80Z is available at Aetrix Electronics and suitable for industrial motor drives, server PSU PFC stages, offline flyback converters, and induction heating inverters requiring stable component supply across multi-year production cycles.

Supply support for STP12NK80Z 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.

STP12NK80Z belongs to the SuperMESH Power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline switching applications where 800 V blocking, avalanche tolerance, and low gate charge are essential.

FAQ

What is the maximum continuous drain current for STP12NK80Z at 100 °C case temperature?

The maximum continuous drain current is 6.6 A at T_C = 100 °C, as specified in Table 1 of DS3339 Rev 8. This derating reflects thermal limits imposed by the TO-220 package's R_thJC = 0.66 °C/W and maximum junction temperature of 150 °C. Operation above this current requires active cooling or pulse-width limitation.

Does STP12NK80Z require external gate protection?

No - STP12NK80Z integrates a bidirectional Zener diode between gate and source, rated for ±30 V, which clamps transient overvoltage and eliminates the need for external gate protection components. This is confirmed in the "Features" section and absolute maximum ratings (V_GS = ±30 V).

Can STP12NK80Z replace STP10NK80Z in existing designs?

Yes, with verification: STP12NK80Z offers lower R_DS(on) (585 mΩ vs. 850 mΩ typ.), same 800 V rating, and improved dv/dt capability. However, gate charge increases slightly (87 nC vs. 72 nC), so gate driver slew rate and power must be rechecked. Layout parasitics should also be validated due to higher peak currents.

What is the safe operating area (SOA) limitation at 100 µs pulse width?

At 100 µs, the SOA is limited by R_DS(on) - meaning the device can sustain up to 10.5 A at V_DS ≤ 75 V or proportionally lower current at higher V_DS. This is shown in Figure 1 of DS3339 Rev 8 and applies to both linear and switching operation under pulsed conditions.