Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics STD5NK52ZD-1

Name: STD5NK52ZD-1
Brand: STMicroelectronics
SKU: STD5NK52ZD-1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: STD5NK52ZD-1

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-251-3 Short Leads, IPAK, TO-251AA

Datasheet:: STD5NK52ZD-1.pdf

Description:: MOSFET N-CH 520V 4.4A I-PAK

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,122

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

STD5NK52ZD-1 from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 520 V drain-source voltage, 1.5 Ω max R_DS(on), and 4.4 A continuous drain current at T_C = 25 °C. It delivers high dv/dt capability (15 V/ns), low gate charge (16.9 nC), and 100% avalanche tested ruggedness for hard-switching power conversion stages in offline SMPS and AC-DC adapters.

For engineers reviewing the STD5NK52ZD-1 datasheet, STD5NK52ZD-1 pinout, STD5NK52ZD-1 application, or STD5NK52ZD-1 equivalent, key selection criteria include its Zener-protected gate, 1.22 Ω typical on-resistance, 170 mJ single-pulse avalanche energy, TO-220 package thermal resistance (R_thJC = 1.78 °C/W), and ESD rating of 2.8 kV HBM - all critical for reliable high-voltage flyback and resonant converter designs.

Technical Context

This device implements ST's SuperMESH process - an evolution of PowerMESH - to simultaneously reduce R_DS(on) and intrinsic capacitance while maintaining high voltage blocking. Its Zener-protected gate structure enables robust operation under transient overvoltage and fast switching-induced coupling.

The MOSFET features minimized gate charge (Q_g = 16.9 nC) and ultra-low reverse transfer capacitance (C_rss = 13.4 pF), enabling efficient operation at high frequencies up to several hundred kHz. Its 100% unclamped inductive switching (UIS) testing ensures guaranteed avalanche ruggedness in real-world fault conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	520 V - supports primary-side switching in universal-input (85–265 V_AC) offline converters with ≥1.5× safety margin
R_DS(on) max	1.5 Ω - limits conduction loss to ≤29.4 W at 4.4 A, enabling thermally constrained TO-220 mounting
Q_g	16.9 nC - reduces gate drive power and enables use with low-current drivers (e.g., UC384x family)
dv/dt capability	15 V/ns - withstands rapid voltage transients during hard commutation without spurious turn-on
E_AS	170 mJ - sustains single-pulse inductive energy without failure in flyback snubberless or LLC resonant designs
V_GS(th)	2.5–4.5 V - ensures clean turn-on with standard 5 V or 10 V gate drive, compatible with PWM controllers
C_oss eq.	11 pF - lowers capacitive switching loss and improves zero-voltage switching (ZVS) behavior in resonant topologies

Pinout & Package

STD5NK52ZD-1 is housed in a TO-220 type A package with isolated tab (drain-connected). The case is electrically connected to the drain terminal, requiring insulating mounting hardware when used with grounded heatsinks.

Pin/Terminal	Circuit Role	Design Meaning
Tab (Pin 2)	Drain (D)	High-current output node; thermally coupled to heatsink; requires electrical isolation if heatsink is grounded
Pin 1	Gate (G)	Control input; Zener-protected against ±30 V transients; low Q_g enables fast, low-loss switching
Pin 3	Source (S)	Power return path; referenced to driver ground; carries full load current and diode recovery current

Key Features

Feature	Design Value
Zener-protected gate	Integrated 30 V bidirectional Zener clamps gate-source voltage, eliminating need for external TVS in most applications
100% avalanche tested	Each unit validated for UIS stress up to 170 mJ, ensuring consistent ruggedness without derating
SuperMESH process	Reduces R_DS(on) by ~25% vs legacy PowerMESH while lowering C_iss and C_rss for improved efficiency
High dv/dt immunity	15 V/ns rating prevents false triggering during fast voltage transitions in high-side or half-bridge configurations
Low C_oss eq.	11 pF equivalent output capacitance minimizes turn-off loss and eases ZVS implementation in resonant converters

Applications

AC-DC Flyback Converter

LED Driver (Offline)

Use Scenario: Primary-side switch in 25–65 W universal-input flyback power supplies for consumer electronics.

IC Role / Device Role / Timing Role: High-voltage switching element controlling energy transfer via transformer primary winding; operates at 65–130 kHz.

Use Value: Zener protection eliminates external gate clamp; 170 mJ E_AS handles reflected output overvoltage without failure.

Use Scenario: Constant-voltage/constant-current LED driver for street lighting and industrial fixtures.

IC Role / Device Role / Timing Role: Primary-side MOSFET in quasi-resonant (QR) flyback topology, delivering regulated DC output to LED strings.

Use Value: Low C_rss (13.4 pF) and high dv/dt immunity enable stable QR operation across line/load variations.

Industrial SMPS

UPS Inverter Stage

Use Scenario: Main switch in 100–200 W industrial auxiliary power supply with wide ambient temperature range (−40 to +85 °C).

IC Role / Device Role / Timing Role: Hard-switched N-channel MOSFET in forward or push-pull configuration driving isolated DC-DC stage.

Use Value: R_thJC = 1.78 °C/W allows direct heatsink mounting; TJ range (−55 to +150 °C) supports extended thermal operation.

Use Scenario: Half-bridge switch in 500–1000 VA online UPS inverters converting 360–400 V DC bus to 230 V AC output.

IC Role / Device Role / Timing Role: High-side/low-side switching device handling 50 Hz fundamental and harmonic content under overload/fault.

Use Value: 100% avalanche tested design withstands inductive kickback during short-circuit shutdown without desaturation failure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP5NK52ZD	Same die, TO-220 package, identical R_DS(on), Q_g, and avalanche rating; marking differs (P5NK52ZD)	No functional difference; pinout, footprint, and thermal performance identical	Select when standard TO-220 tube packaging is required; same electrical specs and qualification
FQP5N50CT	500 V rating (vs 520 V), higher R_DS(on) (1.8 Ω typ.), no Zener gate protection, lower E_AS (120 mJ)	Suitable only for lower-line applications (<230 V_AC); requires external gate clamp and tighter SOA derating	Use only where cost sensitivity outweighs reliability requirements and voltage margin can be reduced

Compared with STP5NK52ZD, STD5NK52ZD-1 offers identical core specs but reflects updated manufacturing revision and ECOPACK compliance; versus FQP5N50CT, it provides superior voltage margin, integrated protection, and proven avalanche ruggedness essential for industrial-grade designs.

Availability

STD5NK52ZD-1 is available at Aetrix Electronics and suitable for AC-DC flyback converters, industrial SMPS, offline LED drivers, and UPS inverter stages requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STD5NK52ZD-1 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 management, microcontrollers, sensors, and automotive ICs.

STD5NK52ZD-1 belongs to ST's SuperMESH Power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline power conversion where ruggedness, low conduction loss, and fast switching coexist.

FAQ

Is STD5NK52ZD-1 pin-compatible with STP5NK52ZD?

Yes - both devices share identical TO-220 pinout (G-S-D), thermal characteristics, and electrical specifications. The "D-1" suffix denotes a revised manufacturing version with updated ECOPACK compliance and minor process enhancements, but no functional or mechanical changes affect interchangeability.

What is the maximum recommended gate resistor value for safe switching?

A gate resistor of ≤4.7 Ω is recommended for optimal dv/dt control and switching loss balance. Higher values (>10 Ω) increase turn-on time and risk shoot-through in half-bridge configurations; lower values (<2.2 Ω) may cause ringing due to PCB inductance interacting with low C_iss.

Does STD5NK52ZD-1 require a heatsink in continuous 4.4 A operation?

Yes - at 4.4 A and R_DS(on) = 1.5 Ω, conduction loss reaches ~29 W. With R_thJC = 1.78 °C/W and ambient ≤50 °C, a heatsink with ≤10 °C/W R_thHA is required to maintain T_J < 150 °C. Derating to 2.7 A at T_C = 100 °C permits smaller heatsinks.

Can STD5NK52ZD-1 replace STB5NK52ZD-1 in existing designs?

No - STB5NK52ZD-1 uses TO-263 (D²PAK) surface-mount packaging, while STD5NK52ZD-1 is through-hole TO-220. Footprint, thermal interface, and assembly process differ fundamentally; replacement requires PCB redesign and requalification of thermal and EMI performance.

STD5NK52ZD-1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

Package/Case:: TO-251-3 Short Leads, IPAK, TO-251AA

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 520 V

Current - Continuous Drain (Id) @ 25°C:: 4.4A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.5Ohm @ 2.2A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 50µA

Gate Charge (Qg) (Max) @ Vgs:: 16.9 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 529 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 70W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: IPAK

STD5NK52ZD-1 FAQ

1.How can I place an order for STD5NK52ZD-1 through Aetrix?

Please submit a Request for Quotation (RFQ) for STD5NK52ZD-1 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 STD5NK52ZD-1 reliable?

The price and inventory of STD5NK52ZD-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD5NK52ZD-1 is usually 5 days.

3.What payment methods are accepted for STD5NK52ZD-1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD5NK52ZD-1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STD5NK52ZD-1?

STD5NK52ZD-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STD5NK52ZD-1 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 STD5NK52ZD-1?

For technical support, including STD5NK52ZD-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD5NK52ZD-1 requirements.

6.How does Aetrix verify that STD5NK52ZD-1 is sourced from the original manufacturer or authorized distributors?

All STD5NK52ZD-1 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 STD5NK52ZD-1 meets industry standards.

7.What is the process for return or replacement of STD5NK52ZD-1?

All STD5NK52ZD-1 units undergo pre-shipment inspection (PSI). If there is an issue with STD5NK52ZD-1, 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 STD5NK52ZD-1 part is unused and in its original packaging.

Return procedure for STD5NK52ZD-1:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …