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Diodes Incorporated FZT657TA
- Part No.:
- FZT657TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT657TA.pdf
- Description:
- TRANS NPN 300V 0.5A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:74,647
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Product details
Overview
FZT657TA from Diodes Incorporated is a 300V NPN high-voltage transistor in SOT223 package, designed for switching and amplification in high-voltage DC-DC converters, flyback power supplies, and industrial control circuits. It delivers 0.5A continuous collector current, supports 1A peak pulse current, and features BVCEO ≥ 300V and BVCBO ≥ 300V with hFE = 40–50 at IC = 10mA.
For engineers reviewing the FZT657TA datasheet, FZT657TA pinout, FZT657TA application, or FZT657TA equivalent, key selection criteria include high-voltage blocking capability (≥300V), thermal performance on 25mm × 25mm 2oz copper (RθJA = 62.5°C/W), safe operating area under pulsed conditions, and complementary pairing with FZT757 for push-pull topologies.
Technical Context
This NPN bipolar junction transistor operates in linear or saturated switching modes with VBE(on) ≤ 1V at IC = 100mA and VCE(sat) ≤ 0.5V under same conditions. Its fT = 30MHz enables use in medium-frequency switching applications up to several hundred kHz.
Thermal design relies on lead-mounted dissipation: RθJL = 12.9°C/W confirms efficient heat transfer from junction to collector lead, while JEDEC-compliant ESD ratings (HBM = 4kV, MM = 400V) support robust handling in automated assembly environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 300 V - Enables operation in 277VAC-derived bus rails and 400V DC intermediate stages without breakdown. |
| IC (cont.) | 0.5 A - Supports continuous load switching in auxiliary power supplies and gate drivers up to ~10W output. |
| hFE | 40–50 @ IC=10mA - Provides predictable base drive requirements for stable biasing in discrete amplifier stages. |
| VCE(sat) | ≤0.5 V @ IC=100mA, IB=10mA - Limits conduction loss to <50mW, critical for thermally constrained SOT223 layouts. |
| fT | 30 MHz - Validates suitability for PWM frequencies up to 500kHz with adequate gain margin in feedback loops. |
| RθJA | 62.5 °C/W (25mm×25mm 2oz Cu) - Defines maximum ambient temperature rise of 125°C at 2W dissipation, guiding PCB copper allocation. |
| ESD HBM | 4,000 V - Meets Class 3A robustness for handling during board-level manufacturing without special precautions. |
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 anchoring.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Emitter) | Emitter terminal | Reference node for base-emitter bias; connects to ground or low-side return path in switching configurations. |
| Pin 2 (Base) | Control input | Receives current-limited drive signal; requires ~10mA for full saturation at 100mA collector load. |
| Pin 3 (Collector) | High-voltage output | Tab-connected collector handles 300V potential and conducts main load current; must be routed with HV clearance per IPC-2221. |
| Pin 4 (Collector Tab) | Thermal & electrical extension | Integral with pin 3; soldered to large copper pour for thermal management and reduced RDS(on)-equivalent loss. |
Key Features
| Feature | Design Value |
|---|---|
| 300V breakdown rating | Enables direct interface with 277VAC rectified outputs and 400V DC bus lines without external snubbers. |
| SOT223 thermal performance | Delivers 2W dissipation on 25mm×25mm 2oz copper-double typical SOT-23 capability-reducing need for heatsinks. |
| Complementary PNP pairing | FZT757 matches voltage/current specs and pinout, simplifying dual-transistor driver design for half-bridge circuits. |
| Lead-free & halogen-free | Meets RoHS 3 and automotive "Green" standards (<900ppm Br/Cl, <1000ppm Sb), supporting eco-compliant industrial production. |
Applications
| Industrial Flyback Converter | AC-DC Auxiliary Supply |
|---|---|
Use Scenario: Isolated 12V/0.3A auxiliary supply in PLC power modules using discrete flyback topology. IC Role / Device Role / Timing Role: Main switch controlling energy transfer from primary to secondary winding at 65kHz. Use Value: 300V VCEO withstands reflected voltage spikes during MOSFET turn-off; low VCE(sat) minimizes conduction loss in low-duty-cycle operation. |
Use Scenario: Standby power supply for smart meter MCU, powered from 230VAC mains via bridge rectifier and capacitor input. IC Role / Device Role / Timing Role: Linear pass transistor regulating unregulated 300V DC bus down to 15V for downstream LDOs. Use Value: High hFE ensures stable current gain across temperature; JEDEC-qualified reliability supports 10+ year field life. |
| High-Voltage Gate Driver | Automotive HVAC Blower Control |
Use Scenario: Discrete level-shifting stage driving high-side N-channel MOSFET in 48V battery-powered motor controller. IC Role / Device Role / Timing Role: NPN emitter-follower providing >200V common-mode isolation between logic-level input and gate drive output. Use Value: BVCBO ≥ 300V prevents breakdown during fast dV/dt transients; 1A ICM supports short-circuit gate discharge pulses. |
Use Scenario: PWM-controlled blower motor driver in automotive cabin climate systems, operating from 12V battery with load dump protection. IC Role / Device Role / Timing Role: Low-side switch modulating motor current at 20kHz to reduce audible noise. Use Value: AEC-Q101-capable variant available (FZT657Q); 150°C TJ(max) ensures operation under hood temperatures up to 125°C ambient. |
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 | VCEO = 250V, IC = 1A, SOT89 package, RθJA = 125°C/W | Limited to ≤250V bus designs; higher current but worse thermal resistance reduces usable power at elevated ambient. | Select when higher IC is prioritized over voltage rating and board space allows larger thermal pad. |
| MJD127 | VCEO = 100V, IC = 2A, TO-220 package, RθJA = 40°C/W | Insufficient for 300V applications; requires heatsink even at 1W; incompatible with SOT223 footprint. | Choose only for lower-voltage, higher-current linear regulators where TO-220 mounting is acceptable. |
Compared with ZTX653 and MJD127, FZT657TA uniquely balances 300V blocking, SOT223 mountability, and 2W dissipation capability-making it optimal for space-constrained, medium-power high-voltage switching where voltage margin and thermal density are both critical.
Availability
FZT657TA is available at Aetrix Electronics and suitable for industrial power supplies, automotive HVAC controllers, and AC-DC auxiliary converters requiring stable component supply with long-term lifecycle assurance.
Supply support for FZT657TA 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 and manufacturing facilities across Asia and the Americas.
FZT657TA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for reliable switching and linear regulation in industrial, automotive, and appliance power systems where voltage endurance and thermal efficiency are essential.
FAQ
What is the maximum continuous power dissipation for FZT657TA on a standard PCB?
FZT657TA achieves 2W continuous power dissipation when mounted on a 25mm × 25mm 2oz copper area per JEDEC test condition (Note 6). This value drops to 1.6W on 1oz copper and 1.2W on minimum recommended pad layout. Derating begins above +25°C ambient at 16mW/°C for the 2oz case.
Is FZT657TA qualified for automotive applications?
The base FZT657TA is not AEC-Q101 qualified, but Diodes offers the automotive-grade FZT657Q variant-identical electrically and mechanically-with full AEC-Q101 qualification, PPAP documentation, and IATF 16949 manufacturing. Automotive users must specify the Q-suffix part number.
How does the SOT223 collector tab affect PCB layout?
The collector tab (pin 3) is internally bonded to the die's collector and must be soldered to a dedicated thermal pad connected to ≥25mm² of 2oz copper. Minimum creepage/clearance to adjacent traces must be ≥2.5mm for 300V operation per IPC-2221; the tab cannot serve as a signal node.
Can FZT657TA replace a MOSFET in low-frequency switching?
FZT657TA can replace low-speed MOSFETs (e.g., <100kHz) in applications where gate drive simplicity and cost matter more than ultra-low RDS(on). Its VCE(sat) ≤ 0.5V at 100mA yields lower conduction loss than many small-signal MOSFETs with RDS(on) > 5Ω-but it lacks inherent body diode and requires explicit base control.
FZT657TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 300 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 50 @ 100mA, 5V
- Power - Max:
- 2 W
- Frequency - Transition:
- 30MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT657TA FAQ
1.How can I place an order for FZT657TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT657TA 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 FZT657TA reliable?
The price and inventory of FZT657TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT657TA is usually 5 days.
3.What payment methods are accepted for FZT657TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT657TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT657TA?
FZT657TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT657TA 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 FZT657TA?
For technical support, including FZT657TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT657TA requirements.
6.How does Aetrix verify that FZT657TA is sourced from the original manufacturer or authorized distributors?
All FZT657TA 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 FZT657TA meets industry standards.
7.What is the process for return or replacement of FZT657TA?
All FZT657TA units undergo pre-shipment inspection (PSI). If there is an issue with FZT657TA, 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 FZT657TA part is unused and in its original packaging.
Return procedure for FZT657TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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