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

STMicroelectronics STULED656

Name: STULED656
Brand: STMicroelectronics
SKU: STULED656
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STULED656

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

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

Datasheet:: STULED656.pdf

Description:: MOSFET N-CH 650V 6A IPAK

Quantity:: RFQ Add To RFQ list

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Inventory:7,394

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Product details

Overview

STULED656 from STMicroelectronics is an N-channel 650 V, 1.1 Ω typ. (1.3 Ω max), 6.0 A Power MOSFET in IPAK (TO-251) package, designed for high-efficiency LED lighting drivers operating in flyback and buck-boost topologies with demanding dv/dt and avalanche robustness requirements.

For engineers reviewing the STULED656 datasheet, STULED656 pinout, STULED656 application, or STULED656 equivalent, key selection criteria include its 650 V V_DS, 1.3 Ω R_DS(on) at 10 V_GS, 100% avalanche tested capability, Zener-protected gate, and optimized diode reverse recovery for low EMI in offline LED drivers.

Technical Context

This MOSFET employs a planar stripe silicon process to achieve low on-resistance while maintaining high voltage blocking and rugged unclamped inductive switching performance. Its built-in back-to-back Zener diodes clamp gate-source transients to ±30 V, eliminating external protection components.

The device exhibits 12 V/ns peak diode recovery dv/dt capability and 285 ns typical reverse recovery time (T_J = 25 °C) with 5100 nC Q_rr, enabling stable operation in high-frequency, discontinuous conduction mode (DCM) LED drivers without snubber networks.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	650 V - Supports universal AC input (85–265 VAC) with sufficient margin for surge and ringing in offline LED drivers.
R_DS(on) max	1.3 Ω @ V_GS = 10 V, I_D = 2.7 A - Enables <1.5 W conduction loss at 6 A, critical for thermally constrained LED driver PCBs.
I_D cont @ T_C = 25 °C	6.0 A - Sustains full-load current in 30–50 W LED ballasts without derating at moderate heatsink temperatures.
E_AS	2.5 mJ @ T_J = 25 °C - Withstands repetitive unclamped inductive energy during startup/fault conditions in flyback converters.
Q_g	34 nC - Low gate charge reduces drive power and enables use with low-cost bipolar or CMOS gate drivers.
dv/dt capability	12 V/ns - Prevents false turn-on during high-slew-rate switching transitions in high-frequency LED drivers.
V_(BR)GSO	30 V - Integrated Zener clamps gate transients, removing need for external TVS and simplifying layout.

Pinout & Package

STULED656 is housed in an IPAK (TO-251) package with exposed drain tab for thermal and electrical connection. The package features a single-row 3-pin configuration with through-hole mounting and internal leadframe design optimized for high-current LED driver PCBs.

Pin/Terminal	Circuit Role	Design Meaning
D (Tab)	Drain	Exposed metal tab serves as primary drain connection and thermal path to heatsink or copper pour; electrically tied to internal die drain.
G (Pin 1)	Gate	Control terminal accepting 10 V logic-level drive; protected by integrated ±30 V Zener diodes to prevent ESD or transient damage.
S (Pin 3)	Source	Return path for load current; referenced to ground in low-side switch configurations common in LED buck drivers.

Key Features

Feature	Design Value
100% avalanche tested	Every unit validated for 2.5 mJ single-pulse avalanche energy, ensuring reliability under real-world overvoltage stress in LED driver output stages.
Extremely high dv/dt capability	12 V/ns rated slope prevents spurious turn-on during fast voltage transients in flyback transformer leakage spikes.
Gate charge minimized	34 nC total gate charge enables efficient driving with low-power controllers like ST's VIPer series, reducing gate driver losses.
Improved diode reverse recovery	285 ns t_rr and 5100 nC Q_rr reduce switching losses and EMI in DCM flyback designs versus standard MOSFETs.
Zener-protected gate	Integrated ±30 V gate-source Zener eliminates need for discrete TVS, saving board space and BOM cost in compact LED modules.

Applications

LED Street Lighting Driver

Commercial Downlight Ballast

Use Scenario: 40–60 W isolated flyback driver powering high-lumen LED arrays in outdoor pole-mounted fixtures with wide ambient temperature range (−40 °C to +85 °C).

IC Role / Device Role / Timing Role: Primary-side power switch handling 650 V DC link, switching at 65 kHz with DCM control to regulate constant current output.

Use Value: Avalanche ruggedness ensures survival during lightning-induced surges; low R_DS(on) maintains >90% efficiency at full load without active cooling.

Use Scenario: 15–25 W non-isolated buck-boost driver for recessed ceiling downlights with TRIAC dimming compatibility and tight THD requirements.

IC Role / Device Role / Timing Role: High-side switch operating in boundary conduction mode (BCM), synchronized to line zero-crossing for smooth dimming.

Use Value: Fast, soft reverse recovery minimizes audible noise and EMI during phase-cut dimming transitions; Zener gate protection avoids failure from dimmer-induced transients.

Industrial LED Panel Light

UV-C Disinfection Module

Use Scenario: 30–50 W constant-current driver for large-area LED panels used in factory floor lighting with strict thermal management constraints.

IC Role / Device Role / Timing Role: Low-side switch in synchronous buck topology, driven by dedicated gate driver IC with adaptive dead-time control.

Use Value: 1.3 Ω R_DS(on) limits junction temperature rise to <110 °C at 6 A with minimal heatsink, enabling ultra-thin panel form factor.

Use Scenario: 10–20 W pulsed driver for UV-C LEDs requiring precise current pulses (100–500 µs) at 1–5 kHz repetition rate for germicidal exposure cycles.

IC Role / Device Role / Timing Role: Fast-switching power switch controlling pulse width and amplitude in high-voltage boost stage feeding UV-C string.

Use Value: 24 A pulsed drain current rating supports high peak currents; 12 V/ns dv/dt immunity prevents misfiring during rapid UV LED turn-off transients.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel 650 V power MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP6NK60ZFP	600 V V_DS, 1.2 Ω R_DS(on), TO-220FP package, no integrated Zener	Lacks gate Zener protection; requires external TVS; lower voltage rating limits surge margin in 277 VAC industrial lighting	Lower cost where 600 V rating suffices and external protection is acceptable
FDPF18N50	500 V V_DS, 0.32 Ω R_DS(on), TO-220FP, no avalanche rating	Insufficient voltage headroom for universal AC input; not avalanche tested; higher conduction loss at same current due to different test condition	Only suitable for low-line (120 VAC) LED drivers with robust input filtering

Compared with STULED656, STP6NK60ZFP trades gate protection and voltage margin for cost, while FDPF18N50 offers lower R_DS(on) but fails to meet 650 V and avalanche requirements of robust LED driver designs-making STULED656 uniquely suited for high-reliability, surge-prone lighting applications.

Availability

STULED656 is available at Aetrix Electronics and suitable for LED street lighting drivers, commercial downlight ballasts, industrial panel lights, and UV-C disinfection modules requiring stable component supply across multi-year production cycles.

Supply support for STULED656 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.

STULED656 belongs to ST's LED-specific Power MOSFET product line, engineered for high-voltage, high-reliability offline LED drivers with emphasis on avalanche ruggedness, low EMI, and integrated gate protection-targeting cost-sensitive yet mission-critical lighting applications.

FAQ

Is STULED656 pin-compatible with other devices in the STULED/STDLED family?

No. STULED656 uses the IPAK (TO-251) package with 3-pin single-row layout (G-S-D tab), while STDLED656 (DPAK), STFILED656 (I²PAKFP), and STPLED656 (TO-220) have distinct footprints, thermal paths, and pin assignments. Mechanical and thermal redesign is required for substitution.

What is the maximum recommended gate resistor value for reliable switching in a 65 kHz flyback LED driver?

Based on 34 nC Q_g and typical 12 V gate drive, a 10 Ω gate resistor achieves ~100 ns rise/fall times-well within safe margins for 65 kHz operation. Values above 22 Ω increase switching losses significantly; values below 4.7 Ω risk overshoot and ringing due to PCB trace inductance.

Does STULED656 require a heatsink in a 40 W LED driver operating at 50 °C ambient?

Yes. With R_thj-case = 1.14 °C/W and 70 W P_TOT rating, dissipation of ~2.5 W at 6 A yields ~2.9 °C junction-to-case rise. However, R_thj-amb = 100 °C/W means >250 °C rise without heatsink-exceeding 150 °C T_J limit. A 15 cm² copper pour with 2 oz copper is minimum; forced air or aluminum heatsink recommended for continuous operation.

Can STULED656 be used in linear regulator mode for analog dimming?

No. STULED656 is optimized for switching operation only. Its SOA curve shows limited safe linear operating area-maximum continuous power in linear mode is <1.2 W at 25 °C case temperature. For analog dimming, use dedicated linear LED drivers or PWM-based switching control instead.

STULED656 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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):: 650 V

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

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

Rds On (Max) @ Id, Vgs:: 1.3Ohm @ 2.7A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 50µA

Gate Charge (Qg) (Max) @ Vgs:: 34 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 895 pF @ 100 V

FET Feature:: -

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

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-251 (IPAK)

STULED656 FAQ

1.How can I place an order for STULED656 through Aetrix?

Please submit a Request for Quotation (RFQ) for STULED656 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 STULED656 reliable?

The price and inventory of STULED656 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STULED656 is usually 5 days.

3.What payment methods are accepted for STULED656?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STULED656 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STULED656?

STULED656 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STULED656 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 STULED656?

For technical support, including STULED656 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STULED656 requirements.

6.How does Aetrix verify that STULED656 is sourced from the original manufacturer or authorized distributors?

All STULED656 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 STULED656 meets industry standards.

7.What is the process for return or replacement of STULED656?

All STULED656 units undergo pre-shipment inspection (PSI). If there is an issue with STULED656, 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 STULED656 part is unused and in its original packaging.

Return procedure for STULED656:

1.Submit a request within 90 days.

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

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