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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

STMicroelectronics STP5NK90Z

Name: STP5NK90Z
Brand: STMicroelectronics
SKU: STP5NK90Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STP5NK90Z

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: STP5NK90Z.pdf

Description:: MOSFET N-CH 900V 4.5A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:8,140

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Product details

Overview

STP5NK90Z from STMicroelectronics is an N-channel, 900 V, 2.5 Ω R_DS(on), 4.5 A (T_C = 25°C), 125 W TO-220 packaged SuperMESH™ MOSFET with integrated gate-source Zener protection, rated for unclamped inductive switching and used in high-voltage AC-DC flyback and resonant converters.

For engineers reviewing the STP5NK90Z datasheet, STP5NK90Z pinout, STP5NK90Z application, or STP5NK90Z equivalent, this device requires attention to its 900 V blocking rating, 4.5 V gate threshold, 41.5 nC total gate charge, 100% avalanche-rated operation, and Zener-protected gate-critical for robustness in offline SMPS designs.

Technical Context

The STP5NK90Z employs ST's SuperMESH™ strip-based layout to achieve low R_DS(on) while maintaining high dv/dt immunity (4.5 V/ns) and ESD robustness (4000 V HBM). Its internal back-to-back gate-source Zener diodes (30 V breakdown) eliminate need for external gate clamping in transient-prone environments.

It operates with a 3–4.5 V gate threshold, delivers 4.8 S transconductance at 2.25 A, and exhibits low capacitances (C_iss = 1160 pF, C_oss = 105 pF) optimized for high-frequency switching up to several hundred kHz in hard-switched topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	900 V - supports direct rectified mains input in universal-input offline converters without cascading devices.
R_DS(on)	2.5 Ω max @ V_GS = 10 V, I_D = 2.25 A - enables low conduction loss at 4.5 A continuous drain current in TO-220 package.
Q_g	41.5 nC - determines gate drive power and switching speed; compatible with standard 1A peak gate drivers.
E_AS	230 mJ - ensures reliable single-pulse avalanche energy handling during overvoltage transients in flyback snubberless designs.
dv/dt	4.5 V/ns - prevents spurious turn-on in high-noise, high-dV/dt environments such as industrial motor drives and lighting ballasts.
T_J range	−55 to +150 °C - supports operation in sealed enclosures and high-ambient industrial power supplies.

Pinout & Package

STP5NK90Z uses a standard TO-220 package with 3 leads: Gate (pin 1), Drain (pin 2), Source (pin 3). The metal tab is electrically connected to the Drain terminal and must be isolated from heatsink unless referenced to high-side potential.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Gate)	Control electrode	Receives 10 V logic-level drive; protected by integrated 30 V Zener against overvoltage transients.
Pin 2 (Drain)	High-voltage power terminal	Connected to primary-side high-voltage rail (e.g., rectified AC line); ties to metal tab for thermal path.
Pin 3 (Source)	Reference node for gate drive	Serves as return path for load current and gate drive loop; defines local ground reference for driver IC.

Key Features

Feature	Design Value
Zener-protected gate	Integrated 30 V bidirectional gate-source Zener eliminates need for external clamping components in surge-prone applications.
100% avalanche rated	Guaranteed single-pulse avalanche energy of 230 mJ enables safe operation under inductive switching faults without derating.
Low C_oss & C_rss	105 pF C_oss and 21.5 pF C_rss reduce switching losses and improve efficiency in high-frequency flyback converters.
High dv/dt immunity	4.5 V/ns rated dv/dt tolerance prevents false triggering in noisy high-voltage environments like LED drivers and adapters.

Applications

AC-DC Flyback Converter

LED Driver (Offline)

Use Scenario: Universal-input (85–265 V_AC) isolated flyback converter delivering 12–24 V output for industrial control systems.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch handling full rectified DC bus (up to 375 V) and managing energy transfer via transformer.

Use Value: 900 V rating allows margin for line surges and reduces need for snubbers; 2.5 Ω R_DS(on) keeps conduction loss below 500 mW at 4.5 A.

Use Scenario: Constant-current LED driver powering streetlight arrays directly from 230 V_AC mains.

IC Role / Device Role / Timing Role: High-side switching element in quasi-resonant topology operating at 65–100 kHz with zero-voltage switching assist.

Use Value: Low Q_g (41.5 nC) and fast tr/tf (7.2/19 ns) enable efficient high-frequency switching; Zener protection sustains repeated lightning-induced gate transients.

Induction Heating Half-Bridge

Industrial Power Supply (HV Output)

Use Scenario: Medium-power (1–2 kW) induction cooker using half-bridge topology with resonant tank.

IC Role / Device Role / Timing Role: Low-side switch subjected to high di/dt (200 A/µs) and reverse recovery stress from body diode conduction.

Use Value: 18 A pulsed drain current and 635 ns reverse recovery time (at 150 °C) ensure reliable commutation; avalanche rating handles shoot-through fault energy.

Use Scenario: Programmable HV DC supply (0–800 V) for test equipment requiring stable, regulated output from rectified 3-phase input.

IC Role / Device Role / Timing Role: Main series pass switch in linear-regulated pre-stage or switching stage in multi-level buck-derived architecture.

Use Value: 150 °C max junction temperature and 125 W P_TOT support continuous operation with forced-air cooling; TO-220 mechanical compatibility simplifies heatsink integration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP6NK90Z	Higher ID (5.2 A), lower R_DS(on) (1.8 Ω), same 900 V rating and TO-220 package	Supports higher continuous power in same footprint; requires re-evaluation of gate drive strength due to increased Q_g (48 nC)	Select when >4.5 A continuous current or <2 Ω on-resistance is required without changing PCB layout.
FQP9N90C	900 V, 9 A, 1.4 Ω R_DS(on), but no integrated gate Zener; TO-220 package	Lacks built-in gate protection-requires external 18 V Zener clamp; higher current capability suits higher-power flybacks	Choose only if external gate protection is acceptable and higher ID/R_DS(on) trade-off justifies added BOM cost and design complexity.

Compared with STP6NK90Z and FQP9N90C, the STP5NK90Z offers optimal balance of ruggedness (Zener + avalanche), thermal performance (125 W), and gate drive simplicity for mid-power offline converters where reliability trumps marginal efficiency gains.

Availability

STP5NK90Z is available at Aetrix Electronics and suitable for AC-DC flyback converters, offline LED drivers, and industrial HV power supplies requiring stable component supply and long-term production continuity.

Supply support for STP5NK90Z 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 analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The SuperMESH™ MOSFET product line targets high-voltage switching applications demanding robustness, low R_DS(on), and high dv/dt immunity-specifically engineered for offline SMPS, lighting, and industrial power conversion.

FAQ

Is STP5NK90Z pin-compatible with STF5NK90Z?

No. STP5NK90Z uses TO-220 package with drain-connected tab, while STF5NK90Z uses TO-220FP (full-pack) with insulated tab and different thermal resistance (R_thj-case = 4.2 °C/W vs. 1 °C/W). Pin numbering is identical (G-D-S), but mechanical mounting and thermal interface differ significantly.

What is the maximum recommended gate drive voltage?

The absolute maximum gate-source voltage is ±30 V, but ST recommends limiting V_GS to ≤20 V for long-term reliability. Gate drive should be designed to avoid overshoot beyond 20 V, especially during fast switching transitions, due to the integrated 30 V Zener's clamping behavior.

Can STP5NK90Z replace STP12NK90Z in existing designs?

No. STP12NK90Z has 12 A rating and 1.1 Ω R_DS(on); substituting STP5NK90Z would increase conduction loss by ~125% and risk thermal runaway at >3 A continuous. It is not a drop-in replacement-board-level redesign and thermal validation are required.

Does STP5NK90Z support gate drive from microcontroller GPIO pins?

No. With a typical gate threshold of 3.75 V and total gate charge of 41.5 nC, direct GPIO driving causes slow, lossy, and thermally unstable switching. A dedicated gate driver IC (e.g., STMicro's TD350 or TI's UCC3732x) with ≥1 A peak output is required for reliable operation.

STP5NK90Z Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 900 V

Current - Continuous Drain (Id) @ 25°C:: 4.5A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 2.5Ohm @ 2.25A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 100µA

Gate Charge (Qg) (Max) @ Vgs:: 41.5 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 1160 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 125W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

STP5NK90Z FAQ

1.How can I place an order for STP5NK90Z through Aetrix?

Please submit a Request for Quotation (RFQ) for STP5NK90Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STP5NK90Z reliable?

The price and inventory of STP5NK90Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP5NK90Z is usually 5 days.

3.What payment methods are accepted for STP5NK90Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP5NK90Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STP5NK90Z?

STP5NK90Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STP5NK90Z order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STP5NK90Z?

For technical support, including STP5NK90Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP5NK90Z requirements.

6.How does Aetrix verify that STP5NK90Z is sourced from the original manufacturer or authorized distributors?

All STP5NK90Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STP5NK90Z meets industry standards.

7.What is the process for return or replacement of STP5NK90Z?

All STP5NK90Z units undergo pre-shipment inspection (PSI). If there is an issue with STP5NK90Z, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STP5NK90Z part is unused and in its original packaging.

Return procedure for STP5NK90Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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