STMicroelectronics STP3NK90ZFP

Overview

STP3NK90ZFP from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 900 V drain-source voltage, 4.8 Ω max R_DS(on) at 10 V V_GS, and 3 A continuous drain current at T_C = 25 °C. It delivers high dv/dt capability (4.5 V/ns), 100% avalanche tested performance, and low gate charge (22.7 nC) for high-efficiency switching in offline SMPS and AC-DC adapters.

For engineers reviewing the STP3NK90ZFP datasheet, STP3NK90ZFP pinout, STP3NK90ZFP application, or STP3NK90ZFP equivalent, key selection criteria include its DPAK package thermal resistance (R_thJC = 1.38 °C/W), 180 mJ single-pulse avalanche energy, and Zener-protected gate enabling robust operation in inductive load switching and flyback converter primary-side switching.

Technical Context

This device implements ST's SuperMESH process - an evolution of PowerMESH - to reduce on-resistance while maintaining high breakdown voltage and ruggedness. Its Zener-protected gate structure eliminates external gate protection components, and its low C_iss (590 pF) and C_rss (13 pF) support fast, efficient hard-switching.

The MOSFET features a built-in source-drain diode with 510 ns reverse recovery time and 2.2 nC Q_rr, optimized for snubberless operation in quasi-resonant and fixed-frequency flyback topologies. Its safe operating area (SOA) is characterized up to 100 µs pulse width, supporting reliable unclamped inductive switching.

Key Specifications

Pinout & Package

STP3NK90ZFP is housed in a DPAK (TO-252) type C3 package with exposed drain tab for thermal and electrical connection. The package features gull-wing leads, surface-mount compatibility, and a recommended footprint per Figure 20 of DS2980 Rev 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage N-channel MOSFET applications.

Compared with STP3NK90ZFP, STP3NK90Z offers better thermal performance but sacrifices SMT compatibility, while FQP3N90C trades gate robustness for marginal R_DS(on) improvement - making STP3NK90ZFP optimal for space-constrained, surge-immune flyback designs.

Availability

STP3NK90ZFP is available at Aetrix Electronics and suitable for AC-DC power supplies, industrial LED drivers, UPS inverters, and appliance motor controls requiring stable component supply across production lifecycles.

Supply support for STP3NK90ZFP 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 SuperMESH Power MOSFET product line targets high-voltage switching applications where avalanche ruggedness, low gate charge, and Zener-protected reliability are essential - especially in cost-sensitive, high-volume offline power conversion.

FAQ

What is the maximum allowable gate-source voltage for STP3NK90ZFP?

The absolute maximum V_GS is ±30 V, as specified in Table 1 of DS2980 Rev 4. Exceeding this rating risks permanent gate oxide damage. The device integrates a bidirectional Zener clamp between gate and source, limiting transient overvoltage to approximately ±30 V - eliminating need for external gate protection in most applications.

Can STP3NK90ZFP replace STD3NK90ZT4 in existing designs?

Yes - STP3NK90ZFP and STD3NK90ZT4 share identical electrical specifications, thermal characteristics, and pinout. Both use the DPAK package and SuperMESH die. The difference lies solely in packaging format: STP3NK90ZFP is supplied in tape-and-reel (2500 pcs), while STD3NK90ZT4 is also tape-and-reel but with different reel dimensions per DS2980 Rev 4 Section 4.2.

Does STP3NK90ZFP require a heatsink in typical 3 A operation?

Yes - at 3 A continuous drain current and 4.8 Ω R_DS(on), conduction loss reaches ~43 W (I²R). With R_thJC = 1.38 °C/W and ambient at 50 °C, junction temperature exceeds 150 °C without heatsinking. A minimum 25 cm² copper pour (2 oz) is required; forced-air or aluminum heatsink is recommended for sustained full-load operation.

How does the Zener protection affect gate drive circuit design?

The integrated Zener clamp fixes gate-source voltage excursion to ±30 V, allowing direct connection to standard 12–15 V gate drivers without external clamps. However, gate resistor value must still be selected to limit peak current during fast transitions - typically 10–47 Ω - to avoid exceeding the driver's current rating while controlling dV/dt and ringing.