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Diodes Incorporated FZT855TA
- Part No.:
- FZT855TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT855TA.pdf
- Description:
- TRANS NPN 150V 5A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,038
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Product details
Overview
FZT855TA from Diodes Incorporated is a 150V NPN medium-power transistor in SOT223 package, designed for high-voltage switching and linear regulation. It delivers 5A continuous collector current, <110mV saturation voltage at 1A, and maintains hFE ≥100 up to 10A - enabling robust performance in DC-DC converters, motor drivers, and industrial power supplies.
For engineers reviewing the FZT855TA datasheet, FZT855TA pinout, FZT855TA application, or FZT855TA equivalent, key selection criteria include its 150V VCEO, low RCE(sat) of 50mΩ, AEC-Q101 readiness, thermal resistance of 42°C/W (on 52mm×52mm 2oz Cu), and complementary pairing with FZT955.
Technical Context
This NPN bipolar junction transistor operates with a minimum BVCEO of 150V and supports pulsed collector currents up to 10A. Its low VCE(sat) (20–110mV across 100mA–5A) and specified hFE up to 10A ensure stable gain under high-current conduction.
The device features a thermally optimized SOT223 (Type DN) package with RθJL = 8.8°C/W and JEDEC Class 3B HBM ESD rating ≥8kV. It is qualified for automotive applications per AEC-Q101 when ordered with appropriate change control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 150 V - Enables use in 100–120V DC bus switching and flyback primary-side circuits |
| IC (continuous) | 5 A - Supports medium-power loads without forced air cooling on standard PCBs |
| VCE(sat) @ 1A | <110 mV - Reduces conduction loss to <110 mW at 1A, improving efficiency in linear regulators |
| hFE @ 10A | ≥10 - Ensures reliable base drive margin in high-current saturated switch applications |
| RθJA | 42 °C/W - Achievable with 52mm×52mm 2oz Cu pad; enables 3W dissipation at +70°C ambient |
| fT | 90 MHz - Supports switching above 100 kHz with controlled turn-on/turn-off behavior |
| ESD HBM | ≥8 kV - Meets IEC 61000-4-2 Level 3 for system-level robustness in industrial environments |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-pin configuration with emitter-connected tab for thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Connected to internal die substrate and exposed metal tab; must be soldered to large copper area for thermal management |
| 2 (Base) | Control input | Low-impedance gate-like node requiring ~500mA peak drive for full saturation at 5A collector current |
| 3 (Collector) | High-current output | Primary current path; electrically isolated from tab but thermally coupled via lead frame |
| 4 (Emitter / Tab) | Secondary emitter connection | Exposed metal pad - electrically identical to Pin 1, used for mechanical anchoring and heat sinking |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | BVCEO = 150V ensures compatibility with 100V+ DC link topologies in industrial SMPS |
| Low on-resistance equivalent | RCE(sat) = 50mΩ reduces I²R losses in high-duty-cycle linear regulators and LDO pass elements |
| High-current gain stability | hFE specified up to 10A confirms usable current amplification even near absolute maximum ratings |
| AEC-Q101 capable | Qualified for automotive power stages when ordered with PPAP support and IATF 16949 manufacturing |
| Green RoHS compliance | Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb) meets EU ELV and JIG standards |
Applications
| Industrial DC-DC Converters | Automotive LED Drivers |
|---|---|
Use Scenario: Step-down converter operating from 48V or 72V battery rails in factory automation systems. IC Role / Device Role / Timing Role: Main switching transistor in non-synchronous buck topology, driven by external PWM controller. Use Value: 150V VCEO provides 2× safety margin over 72V nominal rail; 5A IC supports >200W output with minimal heatsinking. |
Use Scenario: Constant-current driver for high-brightness LED arrays in commercial vehicle lighting. IC Role / Device Role / Timing Role: Linear current regulator with analog dimming interface, operating in active region. Use Value: Low VCE(sat) minimizes power loss at 2–3A load; hFE stability ensures consistent current regulation across temperature. |
| Motor Control (BLDC Gate Driver Stage) | Power Supply OR-ing Circuits |
Use Scenario: High-side switch in three-phase BLDC inverter half-bridge stage for small pumps and fans. IC Role / Device Role / Timing Role: Medium-power level-shifting switch controlling gate of main MOSFET via bootstrap circuit. Use Value: 90MHz fT enables clean 20kHz PWM edge transitions; 10A ICM handles startup surge without second breakdown. |
Use Scenario: Reverse-polarity and redundancy protection in dual-input 24V industrial power supplies. IC Role / Device Role / Timing Role: Active diode replacement in ideal diode controller reference design. Use Value: RCE(sat) = 50mΩ yields lower forward drop than Schottky diodes at >1A; TO-220 footprint alternative in compact SOT223 form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN25012E6TA | Lower VCEO (100V), higher hFE (200 min @ 1A), SOT23-3 package | Not suitable for >100V bus applications; limited thermal mass for >1.5A continuous operation | Select only for low-voltage, space-constrained designs where gain and footprint outweigh voltage headroom needs |
| MJD127G | TO-220 package, VCEO = 100V, IC = 2A, higher RCE(sat) (300mV @ 1A) | Requires heatsink for >1A; incompatible with automated SMT assembly due to through-hole mounting | Choose only for legacy through-hole boards or where mechanical ruggedness outweighs thermal efficiency and assembly cost |
Compared with ZXTN25012E6TA and MJD127G, FZT855TA uniquely balances 150V blocking, 5A current capability, and SMT-compatible thermal performance - making it optimal for new industrial and automotive designs requiring both voltage margin and surface-mount manufacturability.
Availability
FZT855TA is available at Aetrix Electronics and suitable for industrial DC-DC converters, automotive LED drivers, and motor control gate driver stages requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-aligned sourcing.
Supply support for FZT855TA 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.
FZT855TA belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for industrial power conversion and automotive subsystems demanding reliability, thermal resilience, and AEC-Q101 compliance.
FAQ
What is the maximum safe operating voltage for FZT855TA in continuous DC applications?
The absolute maximum VCEO rating is 150V, but for reliable long-term operation, Diodes recommends limiting steady-state collector-emitter voltage to ≤120V. This 20% derating accounts for transients, temperature effects, and process variation - ensuring no risk of secondary breakdown in industrial power supplies.
Can FZT855TA replace a MOSFET in a low-frequency switching application?
Yes - at frequencies below 100kHz and where gate drive simplicity is prioritized over ultra-low RDS(on). Its low VCE(sat) and high IC make it viable for non-critical switching, though it requires sustained base current (500mA at 5A IC) unlike MOSFETs' voltage-driven gates.
Is the exposed emitter tab electrically isolated from other pins?
No - the metal tab is internally bonded to the emitter (Pin 1). It must be connected to the same net as Pin 1 and soldered to a thermal pad tied to system ground or low-impedance emitter return. Isolating the tab creates thermal runaway risk and violates JEDEC SOT223 mechanical specification.
Does FZT855TA meet AEC-Q101 qualification out-of-the-box?
FZT855TA is manufactured in IATF 16949-certified facilities and supports AEC-Q101 qualification - but formal certification requires specific lot traceability, test reporting, and PPAP documentation. Customers must request AEC-Q101-compliant ordering codes (e.g., FZT855TAQ) and engage Diodes' automotive team for program alignment.
FZT855TA 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):
- 5 A
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 355mV @ 500mA, 5A
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1A, 5V
- Power - Max:
- 3 W
- Frequency - Transition:
- 90MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT855TA FAQ
1.How can I place an order for FZT855TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT855TA 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 FZT855TA reliable?
The price and inventory of FZT855TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT855TA is usually 5 days.
3.What payment methods are accepted for FZT855TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT855TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT855TA?
FZT855TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT855TA 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 FZT855TA?
For technical support, including FZT855TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT855TA requirements.
6.How does Aetrix verify that FZT855TA is sourced from the original manufacturer or authorized distributors?
All FZT855TA 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 FZT855TA meets industry standards.
7.What is the process for return or replacement of FZT855TA?
All FZT855TA units undergo pre-shipment inspection (PSI). If there is an issue with FZT855TA, 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 FZT855TA part is unused and in its original packaging.
Return procedure for FZT855TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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