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

Toshiba Semiconductor and Storage TK6A50D(STA4,Q,M)

Name: TK6A50D(STA4,Q,M)
Brand: Toshiba Semiconductor and Storage
SKU: TK6A50D(STA4,Q,M)
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TK6A50D(STA4,Q,M)

Manufacturer:: Toshiba Semiconductor and Storage

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: TK6A50D(STA4,Q,M).pdf

Description:: MOSFET N-CH 500V 6A TO220SIS

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Product details

Overview

TK6A50D(STA4,Q,M) from Toshiba is a silicon N-channel power MOSFET in the π-MOSⅦ family, designed for high-voltage switching regulator applications. It features 500 V drain-source breakdown voltage (V_(BR)DSS), 1.2 Ω typical R_DS(ON) at V_GS = 10 V and I_D = 3 A, and 2.5 S typical forward transfer admittance |Y_fs| - enabling efficient high-current DC-DC conversion in industrial power supplies.

For engineers reviewing the TK6A50D(STA4,Q,M) datasheet, TK6A50D(STA4,Q,M) pinout, TK6A50D(STA4,Q,M) application, or TK6A50D(STA4,Q,M) equivalent, key selection criteria include avalanche ruggedness (E_AS = 144 mJ), gate threshold range (2.4–4.4 V), thermal resistance (R_th(ch-c) = 3.57 °C/W), and SC-67 package compatibility with through-hole PCB layouts.

Technical Context

This device operates as an enhancement-mode N-channel MOSFET with integrated body diode, optimized for hard-switched flyback and forward converter topologies. Its low R_DS(ON) and high |Y_fs| support fast switching transitions while maintaining conduction efficiency at 6 A continuous drain current (T_c = 25°C).

The TK6A50D(STA4,Q,M) delivers robust unclamped inductive switching capability (I_AR = 6 A, E_AS = 144 mJ) and exhibits stable gate threshold behavior across temperature (V_th drift < ±0.5 V from −55°C to 125°C), making it suitable for thermally demanding offline SMPS designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_(BR)DSS	500 V - supports 400 V AC mains-derived DC bus with 25% safety margin
R_DS(ON)	1.2 Ω (typ.) - limits conduction loss to ≤21.6 W at 6 A continuous drain current
\|Y_fs\|	2.5 S (typ.) - enables strong gate drive responsiveness for <55 ns turn-off time
E_AS	144 mJ - withstands single-pulse inductive energy without failure under V_DD = 90 V, L = 6.8 mH
R_th(ch-c)	3.57 °C/W - allows 35 W power dissipation with ≤126°C case-to-channel delta at T_c = 25°C
Q_g	11 nC - determines gate driver current requirement (~1.1 A peak for 10 ns rise time)
V_th	2.4–4.4 V - ensures reliable turn-on with standard 5 V or 10 V logic-level gate drivers

Pinout & Package

TK6A50D(STA4,Q,M) uses the SC-67 (Toshiba 2-10U1B) through-hole package with 3 leads and 1.7 g typical weight. Thermal performance is optimized for heatsink mounting via the drain-connected tab.

Pin/Terminal	Circuit Role	Design Meaning
1 (Left)	Gate	High-impedance control input requiring <1 μA leakage; driven by isolated PWM controller
2 (Center)	Drain	Main high-voltage power terminal; electrically connected to metal tab for thermal conduction
3 (Right)	Source	Power return path and reference for gate drive; tied to primary-side ground in flyback converters

Key Features

Feature	Design Value
π-MOSⅦ process technology	Enables 500 V rating with 1.2 Ω R_DS(ON), reducing die size and cost vs. prior generations
Single-pulse avalanche rating	144 mJ energy tolerance eliminates need for external snubbers in many flyback designs
Low Crss (3 pF)	Minimizes Miller effect, improving noise immunity and enabling stable operation at >100 kHz
RoHS-compliant marking	[[G]]/RoHS COMPATIBLE label confirms lead-free finish and compliance with Directive 2011/65/EU
ESD-sensitive handling	Requires grounded wrist strap and anti-static packaging per JEDEC J-STD-033 guidelines

Applications

Industrial Switching Power Supply	AC-DC Adapter for Office Equipment
Use Scenario: 65 W open-frame power supply for PLC I/O modules operating from 85–264 V AC input. IC Role / Device Role / Timing Role: Primary-side high-voltage switch in discontinuous conduction mode (DCM) flyback topology. Use Value: 1.2 Ω R_DS(ON) reduces conduction loss by 32% versus 1.8 Ω alternatives, improving full-load efficiency to ≥87%.	Use Scenario: Compact wall-mounted adapter powering VoIP phones and network switches. IC Role / Device Role / Timing Role: Main power switch in quasi-resonant (QR) flyback converter with valley-switching control. Use Value: 144 mJ E_AS rating allows safe operation during output short-circuit events without derating.
LED Driver for High-Bay Lighting	DC-DC Converter in Telecom Shelf Power
Use Scenario: Constant-current LED driver delivering 3 A at 48 V output from 375 V DC bus. IC Role / Device Role / Timing Role: Primary-side switch in active-clamp forward converter running at 200 kHz. Use Value: 2.5 S \|Y_fs\| ensures minimal gate drive loss, supporting high-frequency operation with low driver IC power consumption.	Use Scenario: Intermediate bus converter (380 V to 12 V) in distributed power architecture for 48 V telecom systems. IC Role / Device Role / Timing Role: High-side switch in phase-shifted full-bridge topology with synchronous rectification. Use Value: 3.57 °C/W R_th(ch-c) enables 35 W dissipation with passive heatsinking, eliminating need for forced air cooling.

Industrial Switching Power Supply

AC-DC Adapter for Office Equipment

Use Scenario: 65 W open-frame power supply for PLC I/O modules operating from 85–264 V AC input.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch in discontinuous conduction mode (DCM) flyback topology.

Use Value: 1.2 Ω R_DS(ON) reduces conduction loss by 32% versus 1.8 Ω alternatives, improving full-load efficiency to ≥87%.

Use Scenario: Compact wall-mounted adapter powering VoIP phones and network switches.

IC Role / Device Role / Timing Role: Main power switch in quasi-resonant (QR) flyback converter with valley-switching control.

Use Value: 144 mJ E_AS rating allows safe operation during output short-circuit events without derating.

LED Driver for High-Bay Lighting

DC-DC Converter in Telecom Shelf Power

Use Scenario: Constant-current LED driver delivering 3 A at 48 V output from 375 V DC bus.

IC Role / Device Role / Timing Role: Primary-side switch in active-clamp forward converter running at 200 kHz.

Use Value: 2.5 S |Y_fs| ensures minimal gate drive loss, supporting high-frequency operation with low driver IC power consumption.

Use Scenario: Intermediate bus converter (380 V to 12 V) in distributed power architecture for 48 V telecom systems.

IC Role / Device Role / Timing Role: High-side switch in phase-shifted full-bridge topology with synchronous rectification.

Use Value: 3.57 °C/W R_th(ch-c) enables 35 W dissipation with passive heatsinking, eliminating need for forced air cooling.

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
STP6NK50ZFP	500 V V_(BR)DSS, 1.4 Ω R_DS(ON), 12 nC Q_g, TO-220FP package	Higher R_DS(ON) increases conduction loss by ~17% at 6 A; identical avalanche rating	Preferred where TO-220FP footprint is standardized and thermal interface allows higher R_DS(ON)
FQP5N50CT	500 V V_(BR)DSS, 1.5 Ω R_DS(ON), 10 nC Q_g, TO-220 package	Lower Q_g improves switching speed but higher R_DS(ON) raises steady-state loss; no specified E_AS	Selected when gate drive strength is limited and avalanche stress is absent in target design

Compared with STP6NK50ZFP and FQP5N50CT, the TK6A50D(STA4,Q,M) offers the lowest R_DS(ON) (1.2 Ω) and highest |Y_fs| (2.5 S) in its class, delivering superior conduction efficiency and gate drive responsiveness - critical for high-density, thermally constrained industrial SMPS.

Availability

TK6A50D(STA4,Q,M) is available at Aetrix Electronics and suitable for industrial switching power supplies, AC-DC adapters, LED drivers, and telecom DC-DC converters requiring stable component supply and long-term lifecycle support.

Supply support for TK6A50D(STA4,Q,M) 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

Toshiba Electronic Devices & Storage Corporation is a Japanese semiconductor manufacturer specializing in power devices, logic ICs, and storage solutions, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The TK6A50D(STA4,Q,M) belongs to Toshiba's π-MOSⅦ high-voltage MOSFET product line, engineered specifically for energy-efficient offline switch-mode power supplies operating up to 500 V DC bus.

FAQ

What is the maximum continuous drain current rating for TK6A50D(STA4,Q,M) at 25°C case temperature?

The TK6A50D(STA4,Q,M) has a maximum continuous drain current (I_D) of 6 A at T_c = 25°C, as defined in its Absolute Maximum Ratings table. This rating assumes proper heatsinking to maintain channel temperature ≤150°C and accounts for R_th(ch-c) = 3.57 °C/W. At elevated case temperatures, derating is required per the PD–T_c curve in the datasheet.

Does TK6A50D(STA4,Q,M) have an integrated body diode, and what are its reverse recovery characteristics?

Yes, the TK6A50D(STA4,Q,M) includes a monolithic body diode with V_DSF = −1.7 V at I_DR = 6 A and reverse recovery time (t_rr) of 1000 ns. Its Q_rr is 6 μC under specified test conditions (dI_DR/dt = 100 A/μs), which impacts switching loss in hard-commutated topologies and should be factored into snubber design.

What is the gate threshold voltage range for TK6A50D(STA4,Q,M), and how does it affect drive circuit design?

The TK6A50D(STA4,Q,M) has a gate threshold voltage (V_th) range of 2.4 V to 4.4 V at V_DS = 10 V and I_D = 1 mA. This wide range requires gate drive circuits to deliver ≥10 V to ensure full enhancement and minimize R_DS(ON) variation across production lots, especially in high-reliability industrial applications.

Is TK6A50D(STA4,Q,M) suitable for avalanche-rated operation, and what are the test conditions?

Yes, the TK6A50D(STA4,Q,M) is rated for single-pulse avalanche energy (E_AS) of 144 mJ, tested at V_DD = 90 V, T_ch = 25°C (initial), L = 6.8 mH, R_G = 25 Ω, and I_AR = 6 A. Repetitive avalanche is limited to 3.5 mJ per pulse, with duty cycle constrained by channel temperature limits.

What package type and lead configuration does TK6A50D(STA4,Q,M) use, and is it RoHS compliant?

The TK6A50D(STA4,Q,M) uses the SC-67 (Toshiba 2-10U1B) through-hole package with three leads: Gate (pin 1), Drain (pin 2, tab-connected), and Source (pin 3). It carries the [[G]]/RoHS COMPATIBLE marking, confirming compliance with EU Directive 2011/65/EU and lead-free finish per JEITA ED-730A standards.

TK6A50D(STA4,Q,M) Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: π-MOSVII

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 500 V

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

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

Rds On (Max) @ Id, Vgs:: 1.4Ohm @ 3A, 10V

Vgs(th) (Max) @ Id:: 4.4V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 11 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 540 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 35W (Tc)

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220SIS

TK6A50D(STA4,Q,M) FAQ

1.How can I place an order for TK6A50D(STA4,Q,M) through Aetrix?

Please submit a Request for Quotation (RFQ) for TK6A50D(STA4,Q,M) 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 TK6A50D(STA4,Q,M) reliable?

The price and inventory of TK6A50D(STA4,Q,M) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TK6A50D(STA4,Q,M) is usually 5 days.

3.What payment methods are accepted for TK6A50D(STA4,Q,M)?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TK6A50D(STA4,Q,M) transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TK6A50D(STA4,Q,M)?

TK6A50D(STA4,Q,M) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TK6A50D(STA4,Q,M) 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 TK6A50D(STA4,Q,M)?

For technical support, including TK6A50D(STA4,Q,M) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TK6A50D(STA4,Q,M) requirements.

6.How does Aetrix verify that TK6A50D(STA4,Q,M) is sourced from the original manufacturer or authorized distributors?

All TK6A50D(STA4,Q,M) 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 TK6A50D(STA4,Q,M) meets industry standards.

7.What is the process for return or replacement of TK6A50D(STA4,Q,M)?

All TK6A50D(STA4,Q,M) units undergo pre-shipment inspection (PSI). If there is an issue with TK6A50D(STA4,Q,M), 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 TK6A50D(STA4,Q,M) part is unused and in its original packaging.

Return procedure for TK6A50D(STA4,Q,M):

1.Submit a request within 90 days.

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

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