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

STMicroelectronics STL5N80K5

Name: STL5N80K5
Brand: STMicroelectronics
SKU: STL5N80K5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STL5N80K5

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: 8-PowerVDFN

Datasheet:: STL5N80K5.pdf

Description:: MOSFET N-CH 800V 3A PWRFLAT VHV

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STL5N80K5 from STMicroelectronics is an N-channel 800 V, 1.50 Ω typ. R_DS(on), 3 A Power MOSFET using MDmesh™ K5 technology in a PowerFLAT™ 5x6 VHV package. It delivers ultra-low gate charge (5 nC), 100% avalanche-tested ruggedness, and Zener-protected gate for high-voltage switching in offline SMPS, PFC stages, and industrial motor drives.

For engineers reviewing the STL5N80K5 datasheet, STL5N80K5 pinout, STL5N80K5 application, or STL5N80K5 equivalent, key selection criteria include its 800 V V_BR(DSS), 3.3 °C/W R_thj-case, 265 ns t_rr at 25 °C, and built-in gate-source Zener protection-critical for reliable operation in high-dv/dt flyback and resonant converters.

Technical Context

This device employs ST's proprietary MDmesh™ K5 vertical superjunction structure to achieve industry-leading R_DS(on) × area and FoM. Its 800 V blocking capability supports universal-input AC-DC designs up to 400 V DC bus, with 50 V/ns MOSFET dv/dt ruggedness ensuring robustness against parasitic turn-on.

The integrated back-to-back gate-source Zener diodes (V_BR(GSO) = 30 V) provide ESD immunity without external clamping, while the 1.59 µC Q_rr and 265 ns t_rr enable efficient hard-switched operation in continuous conduction mode (CCM) PFC and LLC half-bridge topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR(DSS)	800 V - Supports 400 V DC bus with ≥100 V margin for surge and ringing in offline power supplies
R_DS(on) max	1.75 Ω @ V_GS = 10 V, I_D = 2 A - Enables low conduction loss in 3 A continuous switch-mode applications
Q_g	5 nC - Reduces gate drive power and enables use of low-current drivers in high-frequency (>100 kHz) converters
t_rr	265 ns @ T_j = 25 °C - Limits switching loss and EMI during diode commutation in bridge-leg configurations
R_thj-case	3.3 °C/W - Allows 38 W dissipation at T_C = 25 °C, supporting compact heatsink-less PCB layouts in space-constrained adapters
E_AS	165 mJ - Withstands single-pulse unclamped inductive energy in relay driving and solenoid control
V_GS(th)	3–5 V - Ensures clean turn-on with standard 5 V or 3.3 V logic-level gate drivers

Pinout & Package

STL5N80K5 is housed in a surface-mount PowerFLAT™ 5x6 VHV package with exposed drain pad for thermal and electrical performance. The package features 8 terminals in a dual-row layout optimized for high-voltage isolation and low-inductance source return paths.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3 (S)	Source	Common source connection for internal MOSFET cells; tied directly to PCB ground plane for low-impedance return path
4 (G)	Gate	Control terminal with integrated Zener protection; requires <100 Ω series resistance to limit peak gate current
5, 6, 7, 8 (D)	Drain	High-voltage output node connected to large copper pour for heat spreading and voltage standoff

Key Features

Feature	Design Value
MDmesh™ K5 vertical structure	Reduces R_DS(on) × area by >30% vs prior-generation 800 V superjunction MOSFETs, enabling smaller PCB footprints
Ultra-low Q_g (5 nC)	Enables 300 kHz+ operation with minimal gate driver losses and reduced EMI generation
Zener-protected gate (30 V)	Eliminates need for external gate clamp diodes in noisy industrial environments, reducing BOM count and layout complexity
100% avalanche tested	Guarantees single-pulse ruggedness up to 165 mJ, critical for reliability in unregulated or overload conditions

Applications

AC-DC Adapter Primary Switch

Industrial PFC Boost Stage

Use Scenario: 65 W universal-input flyback converter operating at 65 kHz with 400 V DC bus.

IC Role / Device Role / Timing Role: Main high-side switching element handling full primary current and voltage stress.

Use Value: 1.50 Ω R_DS(on) and 5 nC Q_g reduce both conduction and switching losses, improving efficiency to >88% at full load.

Use Scenario: Active boost PFC stage in 300 W industrial power supply with 50 kHz switching.

IC Role / Device Role / Timing Role: Fast-switching boost switch managing 3 A average inductor current at 800 V peak reverse voltage.

Use Value: 265 ns t_rr and low Q_rr minimize diode recovery loss and voltage overshoot during zero-current switching transitions.

LED Driver Flyback Switch

Solenoid/Relay Driver

Use Scenario: Isolated constant-current LED driver for street lighting, operating in discontinuous conduction mode.

IC Role / Device Role / Timing Role: High-voltage primary-side switch sustaining 800 V breakdown under lightning surge conditions.

Use Value: 800 V V_BR(DSS) and 100% avalanche rating ensure field reliability in outdoor installations with poor surge protection.

Use Scenario: 24 V DC industrial control module driving 12 W inductive loads with fast turn-off requirements.

IC Role / Device Role / Timing Role: Low-R_DS(on) switching element absorbing stored inductive energy via internal body diode and avalanche capability.

Use Value: 165 mJ E_AS safely clamps turn-off spikes without snubber circuits, simplifying design and improving long-term reliability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP5NK80ZFP	TO-220FP package; higher R_DS(on) (1.8 Ω typ); no integrated Zener; 300 mJ E_AS	Requires external gate clamp; better suited for through-hole prototyping or lower-frequency (<60 kHz) designs	Choose when thermal mass of TO-220FP is preferred over SMT footprint constraints
FDPF18N50FT	TO-220F package; 500 V rating; 0.38 Ω R_DS(on); 25 nC Q_g; no avalanche rating	Not suitable for 800 V systems; limited to 400 V DC bus; higher gate drive loss	Select only for cost-sensitive 500 V applications where voltage margin is not required

Compared with STL5N80K5, STP5NK80ZFP offers higher avalanche energy but lacks Zener protection and SMT scalability, while FDPF18N50FT trades voltage rating and ruggedness for lower R_DS(on)-making STL5N80K5 optimal for compact, high-reliability 800 V SMT power stages.

Availability

STL5N80K5 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial PFC modules, LED drivers, and solenoid control systems requiring stable component supply and long-term manufacturability.

Supply support for STL5N80K5 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, digital, and mixed-signal ICs for automotive, industrial, and power applications.

The STL5N80K5 belongs to ST's MDmesh™ K5 high-voltage MOSFET product line, engineered specifically for high-efficiency, high-power-density offline power conversion in space-constrained and thermally demanding environments.

FAQ

What is the maximum continuous drain current at 100 °C case temperature?

The STL5N80K5 supports 1.8 A continuous drain current at T_C = 100 °C, as specified in Table 2 of the datasheet. This derating reflects thermal limits of the PowerFLAT™ 5x6 VHV package and ensures safe operation within SOA boundaries under sustained high-temperature conditions.

Does the device require an external gate resistor for stability?

Yes-a gate resistor of 10–100 Ω is recommended to dampen ringing and control dV/dt during switching. The 16 Ω intrinsic gate resistance (R_g) interacts with PCB trace inductance; external resistance ensures predictable turn-on/turn-off timing and prevents oscillation in high-speed layouts.

Can the internal body diode be used for freewheeling in synchronous rectification?

No-the STL5N80K5 body diode is not optimized for synchronous rectification. Its 265 ns t_rr and 1.5 V V_SD result in high recovery loss and voltage overshoot. Dedicated low-Q_rr Schottky or GaN-based synchronous rectifiers are recommended for high-efficiency secondary-side switching.

Is the PowerFLAT™ 5x6 VHV package RoHS and REACH compliant?

Yes-the package meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. ST certifies it as ECOPACK®2 compliant, with lead-free terminations and halogen-free molding compound, verified per JEDEC J-STD-020 and JESD22-A112 standards.

STL5N80K5 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: MDmesh™ K5

Package/Case:: 8-PowerVDFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 800 V

Current - Continuous Drain (Id) @ 25°C:: 3A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.75Ohm @ 2A, 10V

Vgs(th) (Max) @ Id:: 5V @ 100µA

Gate Charge (Qg) (Max) @ Vgs:: 5 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 177 pF @ 100 V

FET Feature:: -

Power Dissipation (Max):: 38W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerFlat™ (5x6) VHV

STL5N80K5 FAQ

1.How can I place an order for STL5N80K5 through Aetrix?

Please submit a Request for Quotation (RFQ) for STL5N80K5 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 STL5N80K5 reliable?

The price and inventory of STL5N80K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STL5N80K5 is usually 5 days.

3.What payment methods are accepted for STL5N80K5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STL5N80K5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STL5N80K5?

STL5N80K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STL5N80K5 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 STL5N80K5?

For technical support, including STL5N80K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STL5N80K5 requirements.

6.How does Aetrix verify that STL5N80K5 is sourced from the original manufacturer or authorized distributors?

All STL5N80K5 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 STL5N80K5 meets industry standards.

7.What is the process for return or replacement of STL5N80K5?

All STL5N80K5 units undergo pre-shipment inspection (PSI). If there is an issue with STL5N80K5, 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 STL5N80K5 part is unused and in its original packaging.

Return procedure for STL5N80K5:

1.Submit a request within 90 days.

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

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