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STMicroelectronics STD3NK50ZT4
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- Part No.:
- STD3NK50ZT4
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
STD3NK50ZT4.pdf
- Description:
- MOSFET N-CH 500V 2.3A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,870
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Product details
Overview
STD3NK50ZT4 from STMicroelectronics is an N-channel 500 V, 2.3 A, 2.8 Ω (typ) Zener-protected SuperMESH™ MOSFET in DPAK (TO-252) package, designed for high-voltage switching in offline AC-DC power supplies and lighting ballasts. It features 100% avalanche tested ruggedness, 4.5 V/ns dv/dt capability, and integrated gate-source Zener protection enabling robust operation in noisy SMPS environments.
For engineers reviewing the STD3NK50ZT4 datasheet, STD3NK50ZT4 pinout, STD3NK50ZT4 application, or STD3NK50ZT4 equivalent, key selection criteria include its 500 V VDSS, 2.8 Ω RDS(on) at 10 VGS, 45 W PTOT at TC = 25°C, 11 nC total gate charge, and DPAK thermal resistance of 2.77 °C/W (junction-to-case).
Technical Context
This MOSFET employs ST's SuperMESH™ layout-optimized strip-based PowerMESH™-to simultaneously reduce RDS(on) and enhance dv/dt immunity. Its gate-source Zener diodes (±30 V rating) provide intrinsic ESD and transient protection without external components.
The device operates with VGS(th) of 3.0–4.5 V, supports 2.3 A continuous drain current at TC = 25°C, and delivers 120 mJ single-pulse avalanche energy (EAS) at VDD = 50 V, making it suitable for unclamped inductive switching in flyback and resonant converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSS | 500 V - Withstands full mains-referenced DC bus in universal-input 85–265 VAC SMPS |
| RDS(on) (typ) | 2.8 Ω @ VGS = 10 V - Enables low conduction loss at 2.3 A, reducing heatsink requirements |
| ID (cont) | 2.3 A @ TC = 25°C - Supports medium-power adapters up to ~100 W output |
| Qg | 11 nC - Low gate drive demand simplifies gate driver selection and reduces switching loss |
| EAS | 120 mJ - Ensures reliable operation under repetitive unclamped inductive load stress |
| dv/dt | 4.5 V/ns - Resists false turn-on during fast voltage transients in high-noise power stages |
| Rthj-case | 2.77 °C/W - Enables efficient heat transfer to PCB copper when mounted on ≥1 in² 2 oz Cu |
Pinout & Package
DPAK (TO-252) package: surface-mount, 3-lead, exposed drain pad for thermal and electrical connection. Standard footprint per ST's P032P_B mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Source) | Power return path for drain current | Low-inductance source node; connects to power ground plane |
| 2 (Gate) | Control terminal for channel modulation | High-impedance input requiring <11 nC charge for full enhancement |
| 3 (Drain) | Main high-voltage current path | Internally connected to exposed metal tab - must be electrically isolated from heatsink |
Key Features
| Feature | Design Value |
|---|---|
| Zener-protected gate | Integrated ±30 V gate-source Zener diodes eliminate need for external TVS, improving BOM simplicity and board space |
| 100% avalanche tested | Every unit validated for 2.3 A repetitive avalanche current and 120 mJ single-pulse energy - ensures field reliability |
| SuperMESH™ layout | Optimized cell structure achieves 2.8 Ω RDS(on) while maintaining >4.5 V/ns dv/dt immunity - balances conduction and switching robustness |
| ESD hardened | 2000 V HBM rating (VESD(G-S)) - withstands handling and assembly without gate oxide damage |
Applications
| AC Adapters | LED Lighting Drivers |
|---|---|
Use Scenario: 36 W universal-input flyback converter for laptop adapters. IC Role / Device Role / Timing Role: Primary-side high-voltage switch controlling energy transfer into transformer. Use Value: 500 V rating accommodates 400 V DC bus; 2.8 Ω RDS(on) limits conduction loss to <0.15 W at 2.3 A, enabling compact thermal design. |
Use Scenario: Isolated buck-boost LED driver for streetlighting with 30–90 V output range. IC Role / Device Role / Timing Role: Main switching element in primary-side regulation topology. Use Value: 4.5 V/ns dv/dt capability prevents spurious turn-on during transformer leakage spikes; avalanche rating handles output short-circuit stress. |
| Offline SMPS | Industrial Power Supplies |
Use Scenario: 65 W open-frame power supply for industrial control modules. IC Role / Device Role / Timing Role: High-side switch in quasi-resonant (QR) flyback controller interface. Use Value: 11 nC Qg enables clean 65 kHz switching with minimal gate driver loss; DPAK package allows direct PCB copper thermal coupling. |
Use Scenario: 48 V/1 A auxiliary supply in programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Primary switch in fixed-frequency forward converter. Use Value: 100% avalanche testing ensures survival during line surges and load dump events common in factory-floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP3NK50ZFP | TO-220FP package; same 500 V/2.8 Ω/2.3 A specs but higher Rthj-amb (60 °C/W vs 50 °C/W) | Better suited for forced-air-cooled designs where lead-frame thermal mass matters more than PCB conduction | Select when mechanical mounting to heatsink is preferred over PCB thermal management |
| FQP5N50CTF | 500 V, 3.3 Ω RDS(on), 1.5 A ID; no integrated Zener; lower ESD rating (1500 V HBM) | Lacks gate protection - requires external Zener or RC snubber in noisy environments | Choose only if cost sensitivity outweighs robustness needs and layout allows discrete protection |
Compared with STP3NK50ZFP and FQP5N50CTF, STD3NK50ZT4 offers superior PCB thermal performance via DPAK's low 2.77 °C/W Rthj-case, built-in gate protection eliminating external components, and verified 120 mJ avalanche energy - critical for unattended industrial and lighting systems.
Availability
STD3NK50ZT4 is available at Aetrix Electronics and suitable for AC adapters, LED lighting drivers, and offline SMPS requiring stable component supply with long-term industrial lifecycle support.
Supply support for STD3NK50ZT4 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, analog, microcontrollers, and automotive ICs.
STD3NK50ZT4 belongs to ST's SuperMESH™ high-voltage MOSFET product line, engineered specifically for efficiency and ruggedness in cost-sensitive, high-reliability offline power conversion.
FAQ
What is the maximum safe operating temperature for STD3NK50ZT4?
The junction temperature (Tj) must not exceed 150°C under steady-state operation. With Rthj-case = 2.77 °C/W and PTOT = 45 W at TC = 25°C, case temperature must stay below 125°C to maintain margin. Derating begins at 0.36 W/°C above 25°C case temperature.
Does STD3NK50ZT4 require an external gate resistor?
Yes - a gate resistor (typically 10–47 Ω) is required to control dV/dt and prevent ringing. The 11 nC total gate charge and low Ciss (280 pF) make it responsive to moderate gate drive strength, but uncontrolled switching can cause overshoot due to parasitic inductance in the gate loop.
Can STD3NK50ZT4 replace STD3NK50Z-1 in existing designs?
Yes - both share identical electrical specs and IPAK package, but STD3NK50ZT4 uses DPAK (TO-252) with tape-and-reel packaging and different thermal resistance (Rthj-amb = 50 °C/W vs 100 °C/W for IPAK). PCB layout and thermal design must be revalidated for the DPAK footprint and improved thermal coupling.
Is the body diode suitable for synchronous rectification?
No - the body diode has trr = 250 ns and Qrr = 745 µC at 25°C, indicating slow recovery unsuitable for high-frequency synchronous rectification. It is optimized for freewheeling in flyback snubbers or clamp circuits, not active rectification.
STD3NK50ZT4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- SuperMESH™
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 500 V
- Current - Continuous Drain (Id) @ 25°C:
- 2.3A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 3.3Ohm @ 1.15A, 10V
- Vgs(th) (Max) @ Id:
- 4.5V @ 50µA
- Gate Charge (Qg) (Max) @ Vgs:
- 15 nC @ 10 V
- Vgs (Max):
- ±30V
- Input Capacitance (Ciss) (Max) @ Vds:
- 280 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 45W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
STD3NK50ZT4 FAQ
1.How can I place an order for STD3NK50ZT4 through Aetrix?
Please submit a Request for Quotation (RFQ) for STD3NK50ZT4 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 STD3NK50ZT4 reliable?
The price and inventory of STD3NK50ZT4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD3NK50ZT4 is usually 5 days.
3.What payment methods are accepted for STD3NK50ZT4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD3NK50ZT4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STD3NK50ZT4?
STD3NK50ZT4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STD3NK50ZT4 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 STD3NK50ZT4?
For technical support, including STD3NK50ZT4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD3NK50ZT4 requirements.
6.How does Aetrix verify that STD3NK50ZT4 is sourced from the original manufacturer or authorized distributors?
All STD3NK50ZT4 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 STD3NK50ZT4 meets industry standards.
7.What is the process for return or replacement of STD3NK50ZT4?
All STD3NK50ZT4 units undergo pre-shipment inspection (PSI). If there is an issue with STD3NK50ZT4, 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 STD3NK50ZT4 part is unused and in its original packaging.
Return procedure for STD3NK50ZT4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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