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Diodes Incorporated FZT755TA
- Part No.:
- FZT755TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT755TA.pdf
- Description:
- TRANS PNP 150V 1A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,676
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Product details
Overview
FZT755TA from Diodes Incorporated is a 150V PNP high-voltage transistor in SOT223 package, designed for switching and linear amplification in high-voltage industrial power supplies and automotive load control circuits. It supports -1A continuous collector current, -150V VCEO, -0.5V VCE(sat) at -500mA/-50mA, and operates across -55°C to +150°C.
For engineers reviewing the FZT755TA datasheet, FZT755TA pinout, FZT755TA application, or FZT755TA equivalent, key selection criteria include high-voltage blocking capability, thermal resistance (RθJL = 12.9°C/W), complementary pairing with FZT655, and AEC-Q101 readiness for automotive-grade reliability validation.
Technical Context
This PNP bipolar junction transistor delivers robust high-voltage operation with BVCEO = -150V and VEBO = -7V, enabling use in off-line switch-mode power supply (SMPS) output stages and DC-DC converter active clamping circuits. Its fT = 30MHz supports moderate-speed switching up to ~100kHz with controlled turn-off behavior.
The device features low saturation voltage (-0.5V at IC = -500mA/IB = -50mA) and high DC current gain (hFE = 50–300 over IC = -10mA to -500mA), allowing efficient base drive design in discrete driver stages for solenoid, relay, and motor control interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -150V - Enables direct use in 100–120V AC rectified bus applications without series stacking. |
| IC (cont.) | -1A - Supports medium-power loads such as automotive window lift drivers or industrial valve actuators. |
| VCE(sat) | -0.5V @ -500mA/-50mA - Reduces conduction loss to ≤250mW at rated current, easing thermal management. |
| hFE | 50–300 - Allows flexible base resistor selection across operating current range while maintaining saturation. |
| RθJL | 12.9°C/W - Enables reliable power dissipation up to 1.2W on minimum pad layout per JEDEC derating curves. |
| fT | 30MHz - Supports stable switching in flyback and forward converter primary-side snubber or auxiliary supply control. |
| ESD HBM | 4,000V - Provides inherent handling robustness during PCB assembly and field service without added protection. |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-pin configuration with emitter tab connected to lead 3 (collector) for thermal enhancement. Molded green compound, UL 94V-0 rated, 0.112g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Primary current return path; electrically isolated from tab; requires external connection to ground or low-side reference. |
| 2 (Base) | Control input | Current-driven gate; requires ≥-50mA base drive for full saturation at -500mA collector load. |
| 3 (Collector / Tab) | Main current output & thermal interface | Electrically tied to exposed copper tab; must be soldered to ≥25mm² 2oz copper for RθJA = 62.5°C/W performance. |
| 4 (Emitter) | Second emitter connection | Redundant emitter bond wire; internally connected to Pin 1; improves current sharing and reduces parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | BVCEO = -150V enables direct integration into 100–120V RMS mains-derived rails without voltage dividers or cascoding. |
| Thermally optimized package | SOT223 with integral collector-tab provides 12.9°C/W junction-to-lead resistance, supporting >1W dissipation with minimal PCB copper area. |
| Automotive-qualified option | AEC-Q101 stress-tested variant available; manufactured in IATF 16949 facilities with PPAP support for Tier-1 automotive programs. |
| Green compliance | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); RoHS 3 compliant with matte tin plating for reliable solderability. |
Applications
| Industrial Power Supply Output Stage | Automotive Load Switching |
|---|---|
Use Scenario: High-side switching in 120VAC-fed offline SMPS secondary-side synchronous rectifier or auxiliary bias supply. IC Role / Device Role / Timing Role: PNP switch controlling current flow into regulated 12V/24V auxiliary rail; driven by optocoupler-isolated feedback signal. Use Value: -150V VCEO withstands reflected flyback spikes; -0.5V VCE(sat) limits conduction loss to <250mW at 500mA load. |
Use Scenario: Driving resistive-inductive loads such as HVAC blend door actuators or headlight leveling motors in 12V/24V vehicle systems. IC Role / Device Role / Timing Role: Medium-current discrete switch replacing mechanical relays; controlled via microcontroller GPIO with base resistor network. Use Value: AEC-Q101 qualification ensures reliability under temperature cycling and vibration; hFE ≥50 simplifies drive circuit design. |
| DC-DC Converter Active Clamp | Industrial Relay Driver |
Use Scenario: Active clamp transistor in forward or push-pull DC-DC converters operating from 48V–100V intermediate bus voltages. IC Role / Device Role / Timing Role: Clamps transformer reset voltage during off-time; absorbs leakage energy and recycles it to input or output. Use Value: Fast turn-off (fT = 30MHz) and low Cobo = 20pF minimize switching losses and ringing during clamp discharge. |
Use Scenario: Solid-state replacement for electromechanical relays in programmable logic controller (PLC) output modules handling 1A/120VAC loads. IC Role / Device Role / Timing Role: High-voltage interface between low-voltage logic and AC load; provides galvanic isolation when paired with optocoupler. Use Value: -2A ICM peak rating accommodates relay coil inrush; -150V VCBO prevents breakdown during contact arcing transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSS12201CF | Lower VCEO (-100V), higher VCE(sat) (-0.8V), SOT-23 package (lower power handling). | Limited to ≤80V DC applications; unsuitable for 120VAC-derived rails or active clamp circuits above 100V. | Select only for space-constrained, lower-voltage logic-level switching where thermal budget permits higher saturation loss. |
| STMicroelectronics STN1212 | Same VCEO (-150V), but lower IC (-0.5A), higher RθJA (125°C/W), TO-92 package. | Not suitable for sustained 1A loads; lacks thermal performance for industrial power supply duty cycles. | Prefer only for low-duty-cycle signal switching or prototyping where SOT223 mounting is unavailable. |
Compared with NSS12201CF and STN1212, FZT755TA uniquely combines 150V blocking, 1A continuous current, and SOT223 thermal performance-making it the only viable choice for production-grade 100–120V industrial and automotive switching nodes requiring reliability and manufacturability.
Availability
FZT755TA is available at Aetrix Electronics and suitable for industrial power supply output stages, automotive load switching, DC-DC converter active clamp circuits, and PLC relay driver modules requiring stable component supply and long-term lifecycle assurance.
Supply support for FZT755TA 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 distribution operations across Asia, Europe, and the Americas.
FZT755TA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for ruggedized industrial and automotive power interface applications demanding extended voltage range, thermal resilience, and AEC-Q101 compliance.
FAQ
What is the maximum safe operating voltage for FZT755TA in continuous DC applications?
The absolute maximum collector-emitter voltage (VCEO) is -150V at TA = +25°C. For continuous DC operation, derating is required above +25°C ambient: linear derating begins at 0.5°C/W above 25°C, reducing usable VCEO by 0.5V per °C rise in junction temperature. At 100°C junction, maximum safe VCEO drops to approximately -112.5V.
Can FZT755TA replace an NPN transistor in a circuit without redesign?
No-FZT755TA is a PNP device with inverted polarity: current flows from emitter to collector, and base drive must be negative relative to emitter. Direct substitution for an NPN requires flipping biasing, swapping supply references, and verifying signal logic inversion. Its complementary NPN counterpart is Diodes' FZT655, which shares identical package, voltage, and current ratings.
Is FZT755TA qualified for automotive applications?
The FZT755TA itself is a standard-qualification part, but Diodes offers an AEC-Q101-qualified version (FZT755QTA) manufactured in IATF 16949-certified facilities with PPAP documentation support. Customers requiring automotive-grade reliability must specify the Q-suffix variant and engage Diodes' automotive sales team for qualification data packages.
What is the recommended PCB pad layout for optimal thermal performance?
For RθJA = 62.5°C/W, use a 25mm × 25mm 2oz copper pour connected directly to Pin 3 (collector/tab). Minimum recommended layout per Diodes' datasheet specifies C = 2.30mm, C1 = 6.40mm, X1 = 3.30mm, Y2 = 8.00mm. Thermal vias (≥6×0.3mm diameter) under the tab improve heat transfer to inner layers in multilayer boards.
FZT755TA 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):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 200mA, 1A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 50 @ 500mA, 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
FZT755TA FAQ
1.How can I place an order for FZT755TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT755TA 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 FZT755TA reliable?
The price and inventory of FZT755TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT755TA is usually 5 days.
3.What payment methods are accepted for FZT755TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT755TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT755TA?
FZT755TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT755TA 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 FZT755TA?
For technical support, including FZT755TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT755TA requirements.
6.How does Aetrix verify that FZT755TA is sourced from the original manufacturer or authorized distributors?
All FZT755TA 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 FZT755TA meets industry standards.
7.What is the process for return or replacement of FZT755TA?
All FZT755TA units undergo pre-shipment inspection (PSI). If there is an issue with FZT755TA, 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 FZT755TA part is unused and in its original packaging.
Return procedure for FZT755TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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