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Diodes Incorporated FZT757TA
- Part No.:
- FZT757TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT757TA.pdf
- Description:
- TRANS PNP 300V 0.5A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:28,625
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Product details
Overview
FZT757TA from Diodes Incorporated is a 300V PNP high-voltage transistor in SOT223 package, rated for -0.5A continuous collector current and -300V collector-emitter breakdown voltage (BVCEO). It delivers -0.5V VCE(sat) at -100mA/-10mA drive, supports 30MHz fT, and is qualified for automotive applications with IATF 16949 manufacturing and AEC-Q101 capability. It serves as a high-side switch in industrial power supplies and flyback snubber circuits.
For engineers reviewing the FZT757TA datasheet, FZT757TA pinout, FZT757TA application, or FZT757TA equivalent, key selection criteria include verified -300V BVCEO, SOT223 thermal performance (RθJA = 41.7°C/W on 50mm×50mm 2oz Cu), complementary pairing with FZT657, and RoHS-3/halogen-free compliance per Diodes' "Green" standard.
Technical Context
This PNP bipolar junction transistor operates in linear or switching mode with guaranteed -300V blocking capability and -1A peak pulse current handling. Its DC current gain (hFE) ranges from 40 to 50 across -10mA to -100mA collector currents at -5V VCE, supporting stable biasing in high-voltage amplifier and switch driver stages.
The device features low saturation voltages (-0.5V VCE(sat), -1.0V VBE(sat)) under pulsed test conditions (≤300µs, ≤2% duty cycle), enabling efficient operation in energy-constrained high-voltage control loops. Its 20pF Cobo at -20V VCB supports moderate-frequency switching up to several MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| BVCEO | -300 V - Enables use in 277VAC mains-connected circuits with safety margin |
| IC (continuous) | -0.5 A - Supports sustained load switching in auxiliary power rails |
| VCE(sat) | -0.5 V @ -100mA/-10mA - Minimizes conduction loss in high-side switch configurations |
| fT | 30 MHz - Suitable for feedback amplification and moderate-speed switching |
| RθJA | 41.7 °C/W - Requires ≥50mm×50mm 2oz copper pad for full 3.0W dissipation |
| ESD HBM | 4,000 V - Robust handling during board assembly and rework |
| Package | SOT223 - Surface-mount footprint with integrated heat slug for thermal transfer |
Pinout & Package
Package: SOT223 (Type DN), molded green plastic, UL 94V-0 rated, with matte tin-plated leads solderable per MIL-STD-202 Method 208. Weight: 0.112 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | High-voltage output node | Connected to heat slug; primary path for -300V blocking and -0.5A conduction |
| Emitter (E) | Reference terminal | Common return for base drive and load current; tied to system ground or positive rail in high-side topology |
| Base (B) | Control input | Receives negative current to turn on; requires -10mA for full saturation at -100mA IC |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | BVCEO = -300V ensures compatibility with 277VAC and 400VDC bus designs |
| Thermal robustness | RθJL = 12.9°C/W enables direct heat transfer from die to PCB copper via collector tab |
| Automotive qualification | AEC-Q101 stress-tested and manufactured in IATF 16949 certified facilities |
| Environmental compliance | RoHS-3, halogen-free (<900ppm Br/Cl, <1000ppm Sb), "Green" molding compound |
Applications
| Industrial Power Supply Snubbers | High-Voltage DC-DC Converter Switches |
|---|---|
Use Scenario: Clamp voltage spikes across transformer primaries in offline flyback converters operating from 277VAC input. IC Role / Device Role / Timing Role: PNP high-side clamp transistor absorbing leakage inductance energy during MOSFET off-time. Use Value: -300V BVCEO withstands reflected transients without avalanche stress; -0.5V VCE(sat) limits clamp loss. | Use Scenario: High-side switch in isolated DC-DC modules converting 375VDC input to 12V output for telecom equipment. IC Role / Device Role / Timing Role: Synchronous rectifier control element or auxiliary gate driver stage. Use Value: 30MHz fT supports fast turn-off in PWM-controlled topologies; SOT223 thermal path sustains 2W dissipation. |
| Automotive LED Driver Circuits | AC Line Voltage Monitoring Interfaces |
Use Scenario: Constant-current sink for high-brightness LED strings in headlamp modules powered from 48V battery systems. IC Role / Device Role / Timing Role: Linear current regulator with active base control for dimming precision. Use Value: hFE = 40–50 ensures stable current regulation across temperature; -55°C to +150°C rating matches under-hood requirements. | Use Scenario: Resistive divider interface between 277VAC line and microcontroller ADC input for smart meter voltage sensing. IC Role / Device Role / Timing Role: High-impedance buffer amplifier isolating MCU from hazardous AC potentials. Use Value: -300V VCBO prevents breakdown during overvoltage events; ESD HBM = 4kV protects against field-induced discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX951 | BVCEO = -250V (50V lower); hFE = 100 min at -150mA; SOT89 package | Limited to ≤230VAC systems; higher gain reduces base drive burden but lacks AEC-Q101 qualification | Select when higher DC gain is prioritized over voltage rating and automotive compliance |
| MJD2955T4G | BVCEO = -60V; IC = -10A; TO-220 package; RθJA = 1.5°C/W | Designed for high-current, low-voltage linear regulators-not suitable for >100V applications | Choose only for high-power, low-voltage PNP switching where thermal mass outweighs voltage needs |
Compared with ZTX951 and MJD2955T4G, FZT757TA uniquely balances -300V blocking, SOT223 surface-mount scalability, AEC-Q101 readiness, and 3.0W power handling-making it optimal for space-constrained, high-reliability 277VAC-connected systems.
Availability
FZT757TA is available at Aetrix Electronics and suitable for industrial power supply snubbers, automotive LED drivers, and AC line monitoring interfaces requiring stable component supply, long-term lifecycle support, and traceable green sourcing.
Supply support for FZT757TA 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with design, manufacturing, and distribution operations across Asia, the Americas, and Europe.
FZT757TA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for reliable switching and linear operation in 277VAC-connected industrial, automotive, and energy infrastructure applications.
FAQ
What is the maximum safe operating voltage for FZT757TA in continuous DC applications?
The FZT757TA is rated for -300V collector-emitter breakdown (BVCEO) at -10mA IC, verified per JESD22-A114. For continuous DC operation, design must maintain VCE ≤ -240V to ensure 20% derating margin. Transient spikes exceeding -300V require external clamping, as the device is not avalanche-rated.
Can FZT757TA replace an NPN transistor in the same circuit layout?
No-FZT757TA is a PNP device with reversed polarity: collector connects to higher potential, emitter to lower. Direct substitution for an NPN (e.g., FZT657) requires inverting bias network polarity, swapping supply references, and verifying base drive capability. It is complementary-not drop-in-replacing FZT657 in push-pull or differential pairs.
Does FZT757TA require a heatsink in a 2W dissipation scenario?
At 2W dissipation with ambient temperature of 25°C, junction temperature rise is ΔT = 2W × 41.7°C/W = 83.4°C → TJ = 108.4°C, within the -55°C to +150°C range. No external heatsink is required if mounted on ≥50mm×50mm 2oz copper; however, reducing copper area to 25mm×25mm raises RθJA to 62.5°C/W, necessitating thermal derating or airflow.
Is FZT757TA suitable for Class B audio amplifier output stages?
No-its 30MHz fT and limited hFE linearity (40–50) make it unsuitable for high-fidelity audio amplification. It lacks specified THD, slew rate, or frequency response beyond small-signal gain. The device is optimized for switching and high-voltage regulation-not analog signal fidelity-per DS33165 Rev. 7 characterization.
FZT757TA 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:
- PNP
- 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
FZT757TA FAQ
1.How can I place an order for FZT757TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT757TA 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 FZT757TA reliable?
The price and inventory of FZT757TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT757TA is usually 5 days.
3.What payment methods are accepted for FZT757TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT757TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT757TA?
FZT757TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT757TA 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 FZT757TA?
For technical support, including FZT757TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT757TA requirements.
6.How does Aetrix verify that FZT757TA is sourced from the original manufacturer or authorized distributors?
All FZT757TA 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 FZT757TA meets industry standards.
7.What is the process for return or replacement of FZT757TA?
All FZT757TA units undergo pre-shipment inspection (PSI). If there is an issue with FZT757TA, 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 FZT757TA part is unused and in its original packaging.
Return procedure for FZT757TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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