STMicroelectronics STP10NK70Z

Overview

STP10NK70ZFP from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 700 V drain-source voltage, 700 mΩ typical on-resistance at V_GS = 10 V and I_D = 4.5 A, and 8.6 A continuous drain current at T_C = 25 °C. It is designed for high-voltage switching in offline SMPS, lighting ballasts, and AC motor drives where avalanche ruggedness and high dv/dt immunity are critical.

For engineers reviewing the STP10NK70ZFP datasheet, STP10NK70ZFP pinout, STP10NK70ZFP application, or STP10NK70ZFP equivalent, key selection criteria include its 100% avalanche-tested capability, 4.5 V/ns peak diode recovery dv/dt rating, 350 mJ single-pulse avalanche energy, gate charge of 64–90 nC, and TO-220FP insulated package with 2.5 kV RMS insulation withstand voltage.

Technical Context

This device implements ST's SuperMESH process - an evolution of PowerMESH - to simultaneously reduce R_DS(on) and enhance dynamic ruggedness. Its Zener-protected gate structure enables robust ESD tolerance (4 kV HBM) and stable threshold voltage (3.0–4.5 V) across temperature.

The MOSFET features low Crss (41 pF) and optimized Ciss/Coss ratio for fast, controllable switching under high-voltage inductive loads. Its unclamped inductive switching performance is validated per Figure 16/17 in DS2926, with safe operating area defined up to 34 A pulsed drain current and 5.4 A continuous at T_C = 100 °C.

Key Specifications

Pinout & Package

Supplied in TO-220FP (Type B) package: insulated plastic case with integral heatsink tab, 3.6 °C/W junction-to-case thermal resistance, and creepage/clearance compliant with IEC 60950-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP12NK70ZFP, the STP10NK70ZFP offers tighter gate drive requirements and lower conduction loss at moderate current levels; versus FQP7N70, it delivers verified avalanche hardness and integrated gate protection - critical for field-reliable industrial equipment.

Availability

STP10NK70ZFP is available at Aetrix Electronics and suitable for offline SMPS, LED streetlight drivers, and industrial AC motor starters requiring stable component supply and long-term lifecycle support.

Supply support for STP10NK70ZFP 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, specializing in power, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.

The SuperMESH Power MOSFET product line targets high-efficiency, high-reliability switching in 50–500 W offline power conversion systems where avalanche capability and dv/dt immunity are non-negotiable.

FAQ

Is STP10NK70ZFP suitable for use in non-isolated buck converters?

No - STP10NK70ZFP is not recommended for non-isolated buck topologies due to its high V_DS rating and lack of logic-level gate drive compatibility. Its 3–4.5 V gate threshold and 10 V minimum drive requirement make it inefficient in low-voltage, high-duty-cycle applications. It is engineered specifically for high-voltage, isolated topologies like flyback and forward converters where 700 V blocking and avalanche energy absorption are essential.

What is the maximum allowable gate resistor value for reliable switching at 65 kHz?

Based on Q_g = 64–90 nC and typical 1-A peak gate driver capability, the maximum recommended R_G is 4.7 Ω for 65 kHz operation. At this value, calculated t_d(on) + t_r ≈ 41 ns and t_d(off) + t_f ≈ 65 ns meet timing constraints while limiting driver dissipation to <150 mW. Higher values risk incomplete turn-on and increased switching losses, especially at elevated temperatures.

Does the TO-220FP package require thermal interface material when mounted to a heatsink?

Yes - although the TO-220FP provides 2.5 kV RMS insulation between leads and heatsink, thermal interface material (e.g., silicone grease or phase-change pad) is mandatory to achieve the specified R_thJC = 3.6 °C/W. Without it, interfacial air gaps increase effective thermal resistance by 3–5×, risking junction temperature exceedance above 150 °C even at 50% rated power.

Can STP10NK70ZFP replace STP10NK70Z in existing designs?

No - STP10NK70Z (non-FP) is obsolete and was discontinued per DS2926 Rev 3. STP10NK70ZFP replaces it with enhanced packaging (insulated TO-220FP), identical electrical specs, and improved thermal performance (R_thJC = 3.6 °C/W vs. 4.2 °C/W). Layout changes are required: the FP variant's insulated tab eliminates need for mica washers but mandates updated mechanical mounting and creepage verification.