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

STMicroelectronics STU6N90K5

Name: STU6N90K5
Brand: STMicroelectronics
SKU: STU6N90K5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STU6N90K5

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-251-3 Long Leads, IPak, TO-251AB

Datasheet:: STU6N90K5.pdf

Description:: MOSFET N-CH 900V 6A IPAK

Quantity:: RFQ Add To RFQ list

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Inventory:162

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Product details

Overview

STU6N90K5 from STMicroelectronics is a high-voltage N-channel Power MOSFET using MDmesh™ K5 technology, rated for 900 V V_DS, 0.91 Ω typ. R_DS(on) at V_GS = 10 V and I_D = 3 A, with 6 A continuous drain current at T_C = 25 °C. It integrates Zener-protected gate-source diodes and is optimized for high-efficiency switching in offline SMPS and PFC stages.

For engineers reviewing the STU6N90K5 datasheet, STU6N90K5 pinout, STU6N90K5 application, or STU6N90K5 equivalent, key selection criteria include its ultra-low Q_g (11 nC), rugged dv/dt capability (50 V/ns), 100% avalanche tested rating, and IPAK (TO-251) thermal performance (R_thj-case = 1.14 °C/W).

Technical Context

This device employs ST's proprietary vertical MDmesh™ K5 structure to minimize conduction and switching losses simultaneously. Its low C_iss (342 pF), C_oss (31 pF), and Cr_ss (1.2 pF) enable fast, controlled switching with minimal EMI generation in hard-switched topologies.

The built-in back-to-back gate-source Zener diodes provide ±30 V V_GS protection without external components, while the 210 mJ single-pulse avalanche energy (E_AS) supports robust unclamped inductive load handling in flyback and resonant converters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	900 V - supports 700 V DC bus designs with 20% margin for surge and ripple
R_DS(on) max	1.10 Ω - ensures <1.1 W conduction loss at 3 A, critical for thermal management in enclosed adapters
Q_g	11 nC - reduces gate drive power and enables use with low-current controllers like L6565
T_j max	150 °C - allows operation in high-ambient industrial environments without derating below 100 °C case temp
R_thj-case	1.14 °C/W - delivers 110 W dissipation capability with modest heatsinking in IPAK package
E_AS	210 mJ - sustains repetitive unclamped inductive switching in PFC boost stages without failure
dv/dt ruggedness	50 V/ns - prevents spurious turn-on during high-slew-rate transients in bridge-leg configurations

Pinout & Package

STU6N90K5 is housed in an IPAK (TO-251) type C package with three leads and an exposed drain tab for thermal and electrical connection. The package meets ECOPACK® environmental compliance standards.

Pin/Terminal	Circuit Role	Design Meaning
1 (GATE)	Control terminal	Receives 10 V logic-level drive; low R_g (6.4 Ω) minimizes gate ringing in high-frequency layouts
2 (DRAIN)	High-side power switch node	Connected to exposed metal tab; electrically and thermally coupled to PCB copper pour for heat spreading
3 (SOURCE)	Reference return path	Provides low-inductance source return; critical for stable gate control in high-di/dt applications

Key Features

Feature	Design Value
MDmesh™ K5 vertical structure	Reduces R_DS(on) × area by >30% vs prior K3/K4 generations, enabling smaller board footprint in 900 V designs
Zener-protected gate	Integrated ±30 V V_GS clamping eliminates need for external TVS, reducing BOM count and layout complexity
Ultra-low Q_gd/Q_gs ratio	Q_gd = 7 nC, Q_gs = 2.5 nC - improves Miller immunity and enables reliable zero-voltage switching in LLC converters
100% avalanche tested	Each unit validated for 2 A repetitive avalanche current, ensuring field reliability in overload conditions

Applications

Industrial SMPS

Server PFC Stage

Use Scenario: 1 kW active clamp forward converter operating at 100 kHz with 750 V DC link.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch handling full output power with hard switching.

Use Value: Low R_DS(on) and Q_g reduce conduction and switching losses, improving efficiency from 92.1% to 93.4% at full load.

Use Scenario: Continuous conduction mode (CCM) boost PFC in 2 kW telecom rectifier.

IC Role / Device Role / Timing Role: Boost switch subjected to high di/dt and voltage overshoot during line surges.

Use Value: 50 V/ns dv/dt ruggedness and 210 mJ E_AS prevent false triggering and avalanche failure during transient events.

LED Streetlight Driver

EV Charger Auxiliary Supply

Use Scenario: Isolated flyback driver for 150 W outdoor LED fixture with wide input range (90–305 VAC).

IC Role / Device Role / Timing Role: Primary switch managing peak currents up to 24 A (pulsed) under short-circuit conditions.

Use Value: 24 A pulsed ID rating and 100% avalanche testing ensure sustained operation during lamp hot-plug and output short events.

Use Scenario: Auxiliary 24 V/1 A supply in 11 kW AC EV on-board charger, powered from 800 V DC link.

IC Role / Device Role / Timing Role: High-side switch in non-isolated buck converter feeding isolated gate drivers and MCU rails.

Use Value: IPAK thermal resistance (1.14 °C/W) enables 110 W dissipation with minimal heatsink, simplifying mechanical integration in space-constrained modules.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STW12N95K5	Higher V_DS (950 V), higher R_DS(on) (1.25 Ω), same IPAK package	Better surge margin in 800 V DC systems; trade-off in conduction loss at 6 A	Select when system requires >900 V breakdown headroom and can accept +13% R_DS(on)
FCH90N90F	900 V, 0.95 Ω R_DS(on), TO-247 package, no integrated Zener	Superior thermal performance (R_thj-case = 0.55 °C/W) but requires external gate protection	Prefer for high-power (>300 W) designs where heatsinking dominates over board space and BOM simplicity

Compared with STW12N95K5 and FCH90N90F, STU6N90K5 offers optimal balance of low gate charge (11 nC), integrated Zener protection, and IPAK compactness-making it ideal for cost-sensitive, space-constrained 100–500 W offline converters where gate drive simplicity and layout density matter most.

Availability

STU6N90K5 is available at Aetrix Electronics and suitable for industrial SMPS, server PFC stages, and LED streetlight drivers requiring stable component supply across multi-year production cycles.

Supply support for STU6N90K5 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The MDmesh™ K5 product line targets high-efficiency, high-voltage power conversion-specifically engineered to replace older planar MOSFETs in 600–950 V applications with superior FoM (R_DS(on) × Q_g) and ruggedness.

FAQ

What is the maximum safe operating temperature for STU6N90K5?

The STU6N90K5 has a specified junction temperature range of –55 °C to +150 °C. For reliable long-term operation, ST recommends limiting steady-state T_j to ≤130 °C. At T_C = 100 °C, the device supports 4 A continuous drain current, and its R_DS(on) increases only 1.8× from room temperature due to the K5 process's improved temperature coefficient.

Does STU6N90K5 require external gate protection?

No. STU6N90K5 integrates back-to-back Zener diodes between gate and source, rated for ±30 V V_GS breakdown. This eliminates the need for external TVS diodes in typical gate-drive circuits, provided the gate resistor limits peak transient current to <100 mA. The Zener clamping is verified per JEDEC JESD22-A114.

Can STU6N90K5 be used in synchronous rectification?

No. STU6N90K5 is a standard N-channel enhancement-mode MOSFET with a body diode optimized for reverse recovery (t_rr = 342 ns at 25 °C), not for low-loss synchronous rectification. Its R_DS(on) and Q_rr values are not competitive with dedicated SR controllers or logic-level MOSFETs designed for 12–24 V secondary-side operation.

What is the recommended gate resistor value for 100 kHz operation?

For 100 kHz hard-switching in a 450 V DC bus application, a 4.7 Ω gate resistor is validated in ST's reference design (Figure 14). This value balances switching speed (t_d(off) = 30.4 ns) against gate drive loss and EMI. Lower values (≤2.2 Ω) increase dV/dt stress; higher values (>10 Ω) degrade efficiency due to prolonged transition times.

STU6N90K5 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: MDmesh™ K5

Package/Case:: TO-251-3 Long Leads, IPak, TO-251AB

Packaging:: Tube

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 900 V

Current - Continuous Drain (Id) @ 25°C:: 6A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.1Ohm @ 3A, 10V

Vgs(th) (Max) @ Id:: 5V @ 100µA

Gate Charge (Qg) (Max) @ Vgs:: -

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: -

FET Feature:: -

Power Dissipation (Max):: 110W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: IPAK (TO-251)

STU6N90K5 FAQ

1.How can I place an order for STU6N90K5 through Aetrix?

Please submit a Request for Quotation (RFQ) for STU6N90K5 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 STU6N90K5 reliable?

The price and inventory of STU6N90K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STU6N90K5 is usually 5 days.

3.What payment methods are accepted for STU6N90K5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STU6N90K5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STU6N90K5?

STU6N90K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STU6N90K5 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 STU6N90K5?

For technical support, including STU6N90K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STU6N90K5 requirements.

6.How does Aetrix verify that STU6N90K5 is sourced from the original manufacturer or authorized distributors?

All STU6N90K5 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 STU6N90K5 meets industry standards.

7.What is the process for return or replacement of STU6N90K5?

All STU6N90K5 units undergo pre-shipment inspection (PSI). If there is an issue with STU6N90K5, 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 STU6N90K5 part is unused and in its original packaging.

Return procedure for STU6N90K5:

1.Submit a request within 90 days.

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

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