Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated FZT658TC

Name: FZT658TC
Brand: Diodes Incorporated
SKU: FZT658TC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: FZT658TC

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-261-4, TO-261AA

Datasheet:: FZT658TC.pdf

Description:: TRANS NPN 400V 0.5A SOT-223-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,469

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

FZT658TC from Diodes Incorporated is a 400V NPN high-voltage transistor in SOT223 package, designed for switching and linear regulation in high-voltage DC-DC converters, flyback power supplies, and industrial control circuits. It delivers 500mA continuous collector current, supports 1A peak pulse current, achieves V_CE(sat) < 250mV at 50mA/5mA drive, and maintains h_FE > 40 up to 200mA.

For engineers reviewing the FZT658TC datasheet, FZT658TC pinout, FZT658TC application, or FZT658TC equivalent, key selection criteria include high-voltage blocking (V_CEO = 400V), low saturation voltage under medium-current drive, thermal performance on standard PCB copper areas, and compatibility with complementary PNP FZT758 in push-pull topologies.

Technical Context

This NPN bipolar junction transistor operates in active and saturation regions for high-side switching and linear amplification. Its 400V V_CEO rating enables use in off-line switch-mode power supplies up to 375V DC bus, while its 3W power dissipation (on 50mm × 50mm 2oz Cu) supports thermally constrained board layouts.

The device exhibits f_T = 50MHz and C_obo = 10pF at 20V, supporting moderate-speed switching (t_on = 130ns, t_off = 3.3µs) with controlled capacitive loading. Base-emitter turn-on voltage is specified at 1V @ 100mA, ensuring predictable drive requirements in discrete gate-driver stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400V - Enables direct connection to 375V DC bus without external snubbing in flyback or buck-derived topologies.
I_C (continuous)	500mA - Supports output power levels up to ~15W in non-isolated regulators with adequate heatsinking.
V_CE(sat)	<250mV @ 50mA/5mA - Minimizes conduction loss and self-heating during sustained on-state operation.
h_FE	>40 @ 200mA - Ensures stable current gain across mid-range load currents, reducing base drive variability.
f_T	50MHz - Allows reliable switching at frequencies up to ~5–10MHz with controlled rise/fall times.
R_θJA	41.7°C/W (50mm×50mm 2oz Cu) - Defines maximum ambient temperature rise for thermal design on standard FR4 PCBs.
ESD HBM	4kV - Provides robustness against handling-induced electrostatic discharge during assembly.

Pinout & Package

Package: SOT223 (Type DN), surface-mount, 4-pin configuration with collector tab (pin 3) electrically connected to lead frame for thermal and electrical continuity.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Low-impedance return path; requires low-inductance routing to minimize switching overshoot.
2 (Base)	Control input	Receives current-limited drive; 10mA typical for full saturation at 100mA I_C.
3 (Collector / Tab)	Main current source & thermal path	Electrically tied to exposed metal tab; must be connected to ground or low-impedance plane for thermal management.
4 (Collector)	Redundant collector connection	Internally bonded to pin 3; used for mechanical stability and additional current carrying capacity.

Key Features

Feature	Design Value
High-voltage blocking	V_CEO = 400V ensures safe operation in 375V DC bus applications without derating.
Medium-current gain stability	h_FE > 40 maintained up to 200mA supports consistent drive in power stage feedback loops.
Low-saturation voltage	V_CE(sat) < 250mV at 50mA reduces conduction loss by >30% vs. standard 500mA transistors.
Thermal resistance optimization	R_θJL = 12.9°C/W enables efficient heat transfer from junction to solder point via collector tab.
Automotive-grade process option	Available in AEC-Q101 qualified version (FZT658TA) for automotive power modules requiring PPAP support.

Applications

Industrial Flyback Converter

AC-DC Adapter Primary Switch

Use Scenario: 24V/1A isolated output from 375V DC bus in DIN-rail mounted PLC power supply.

IC Role / Device Role / Timing Role: Main switching transistor in discontinuous conduction mode (DCM) flyback topology.

Use Value: 400V V_CEO eliminates need for voltage clamping; 3W PD rating allows operation without heatsink at 50°C ambient.

Use Scenario: Compact 12V/0.5A wall adapter for IoT gateway devices.

IC Role / Device Role / Timing Role: Primary-side switch in quasi-resonant (QR) flyback controller reference design.

Use Value: Low V_CE(sat) improves efficiency by 1.2% at full load; SOT223 footprint simplifies layout versus TO-220 alternatives.

LED Driver for High-Voltage Strings

Relay/Contactor Driver Stage

Use Scenario: Constant-current driver powering 100V LED string in streetlight fixture.

IC Role / Device Role / Timing Role: Linear pass element in analog dimming loop with overvoltage protection.

Use Value: Stable h_FE > 40 up to 200mA ensures precise current regulation across temperature; 150°C T_J max supports outdoor thermal cycling.

Use Scenario: Solid-state replacement for electromechanical relay in HVAC control panel.

IC Role / Device Role / Timing Role: High-side switch driving 24V/500mA solenoid coil with PWM modulation.

Use Value: 1A I_CM withstands inductive kickback; ESD HBM = 4kV prevents latch-up during field wiring.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZTX653	V_CEO = 300V, h_FE = 100 @ 100mA, SOT89 package	Limited to ≤265V AC-input designs; higher gain but lower voltage margin	Select when gain linearity at low current dominates over voltage headroom.
MJD127	V_CEO = 100V, I_C = 2A, TO-220 package	Requires external snubber above 80V; larger footprint and higher thermal mass	Choose only if higher continuous current (>500mA) and through-hole mounting are mandatory.

Compared with ZTX653 and MJD127, FZT658TC uniquely balances 400V blocking, SOT223 thermal efficiency, and medium-current gain stability-making it optimal for compact, high-voltage flyback and industrial control designs where voltage margin and board space are critical.

Availability

FZT658TC is available at Aetrix Electronics and suitable for industrial flyback converters, AC-DC adapters, high-voltage LED drivers, and relay driver stages requiring stable component supply and long-term manufacturability.

Supply support for FZT658TC 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

FZT658TC belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for cost-sensitive, space-constrained power conversion and industrial control applications demanding reliability at elevated DC bus voltages.

FAQ

What is the maximum allowable junction temperature for FZT658TC?

The absolute maximum junction temperature is +150°C, with storage temperature range matching at –55°C to +150°C. Derating begins at +25°C ambient per R_θJA curves: for example, on 50mm × 50mm 2oz Cu, power dissipation must be reduced by 24mW/°C above 25°C to maintain T_J ≤ 150°C.

Is FZT658TC pin-compatible with FZT758?

No - FZT658TC (NPN) and FZT758 (PNP) share identical SOT223 package and pinout (Emitter-Base-Collector/Tab-Collector), but polarity reversal means they are complementary-not interchangeable. Direct substitution would invert logic and cause circuit failure; both must be used together in push-pull or H-bridge configurations.

Does FZT658TC require a heatsink in typical applications?

A dedicated heatsink is not required when mounted on ≥25mm × 25mm 2oz copper per Diodes' thermal notes. At 500mA continuous current and 25°C ambient, junction temperature rises ~21°C above ambient (using R_θJA = 41.7°C/W). Heatsinking becomes necessary only above 70°C ambient or with >75% duty-cycle pulsed loads.

Can FZT658TC be used in automotive applications?

The standard FZT658TC is not AEC-Q101 qualified, but Diodes offers the FZT658TA variant - identical electrically and mechanically, manufactured in IATF 16949-certified facilities, PPAP-capable, and qualified to AEC-Q101. For automotive use, specify FZT658TA and engage Diodes' automotive team for change control documentation.

FZT658TC Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-261-4, TO-261AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 10mA, 100mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 200mA, 10V

Power - Max:: 2 W

Frequency - Transition:: 50MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223-3

FZT658TC FAQ

1.How can I place an order for FZT658TC through Aetrix?

Please submit a Request for Quotation (RFQ) for FZT658TC 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 FZT658TC reliable?

The price and inventory of FZT658TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT658TC is usually 5 days.

3.What payment methods are accepted for FZT658TC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT658TC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FZT658TC?

FZT658TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FZT658TC 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 FZT658TC?

For technical support, including FZT658TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT658TC requirements.

6.How does Aetrix verify that FZT658TC is sourced from the original manufacturer or authorized distributors?

All FZT658TC 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 FZT658TC meets industry standards.

7.What is the process for return or replacement of FZT658TC?

All FZT658TC units undergo pre-shipment inspection (PSI). If there is an issue with FZT658TC, 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 FZT658TC part is unused and in its original packaging.

Return procedure for FZT658TC:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…