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Diodes Incorporated FZT749QTA
- Part No.:
- FZT749QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT749QTA.pdf
- Description:
- TRANS PNP 25V 3A SOT-223
- Quantity:
- Payment:
- Shipping:
Inventory:9,903
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Product details
Overview
FZT749QTA from Diodes Incorporated is a 25V PNP medium-power bipolar junction transistor in SOT223 package, rated for -3A continuous collector current and -8A peak pulse current, with VCE(sat) < -300mV at -1A. It serves as a high-current switch in automotive gate-driving circuits, qualified to AEC-Q101 and manufactured in IATF16949-certified facilities.
For engineers reviewing the FZT749QTA datasheet, FZT749QTA pinout, FZT749QTA application, or FZT749QTA equivalent, key selection criteria include its -25V VCEO, low saturation voltage under high current, thermal resistance of 41.7°C/W (50mm × 50mm copper), AEC-Q101 qualification, and complementary pairing with FZT649.
Technical Context
This PNP BJT operates in linear or saturated switching mode with DC current gain (hFE) ranging from 70 to 570 across 50mA–2A collector currents, and delivers fT = 100–160MHz at -5V VCE and -100mA IC. Its safe operating area supports pulsed operation up to 100ms at -25V and -3A.
Thermal performance depends on PCB copper area: RθJA degrades from 41.7°C/W (50mm × 50mm 2oz) to 104°C/W (minimum pad layout). The device exhibits ESD robustness of 4kV HBM and 400V MM, meeting automotive reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -25V - Maximum allowable collector-emitter voltage before breakdown in common-emitter configuration |
| IC (cont.) | -3A - Continuous collector current rating defining steady-state power handling capability |
| VCE(sat) | -0.12V typ. @ -1A/-100mA - Low saturation voltage enabling efficient switching with minimal conduction loss |
| hFE | 100–570 - DC current gain range supporting stable biasing across load current variations |
| fT | 100–160MHz - Transition frequency indicating usable bandwidth for high-speed switching applications |
| RθJA | 41.7°C/W - Junction-to-ambient thermal resistance with 50mm × 50mm 2oz copper, critical for thermal design margin |
| ESD HBM | 4,000V - Human Body Model rating confirming robustness against assembly-level electrostatic discharge |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-pin outline with exposed collector tab for thermal dissipation. Molded green compound, UL 94V-0 rated, 0.112g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Emitter) | E | Current exit path; connected to ground or low-side reference in PNP switch configurations |
| Pin 2 (Base) | B | Control input; requires ~100mA drive for full saturation at -1A collector current |
| Pin 3 (Collector) | C | Main current path; electrically and thermally tied to exposed metal tab for heatsinking |
| Pin 4 (Collector Tab) | C (redundant) | Primary thermal interface; must be soldered to large copper pour for RθJA ≤ 41.7°C/W |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade temperature cycling (-55°C to +150°C), vibration, and lifetime reliability |
| Low VCE(sat) | < -300mV @ -1A ensures <150mW conduction loss, reducing thermal stress in gate-drive stages |
| High ICM | -8A peak pulse rating supports short-duration surge loads like MOSFET turn-on transients |
| Green construction | Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb) meets global environmental compliance |
| Complementary NPN pair | FZT649 enables matched push-pull driver designs with symmetrical switching characteristics |
Applications
| Automotive Gate Driving | Industrial Motor Control |
|---|---|
Use Scenario: Driving high-side N-channel MOSFETs or IGBTs in 12V/24V automotive power modules. IC Role / Device Role / Timing Role: PNP switch providing fast, low-loss current sink during gate discharge phase. Use Value: -300mV VCE(sat) minimizes gate discharge energy loss and improves switching efficiency in PWM inverters. | Use Scenario: Controlling solenoid valves and relay coils in factory automation PLC output stages. IC Role / Device Role / Timing Role: High-current discrete switch replacing mechanical contacts for improved cycle life and noise immunity. Use Value: -8A ICM handles inductive kickback surges without clamping diodes in compact SOT223 footprint. |
| Power Supply Sequencing | LED Driver Current Sink |
Use Scenario: Enabling/disabling auxiliary rails in multi-rail DC-DC converters with precise timing control. IC Role / Device Role / Timing Role: Voltage-controlled switch sequencing power-up order via base drive logic. Use Value: Tight hFE distribution (70–570) ensures predictable turn-on delay across production lots for deterministic sequencing. | Use Scenario: Constant-current sinking for high-brightness LED strings in automotive lighting modules. IC Role / Device Role / Timing Role: Linear-mode current regulator using emitter degeneration resistor feedback. Use Value: Stable -3A IC rating and low thermal resistance enable 2.5W continuous dissipation in ambient temperatures up to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSS40501MUTBG | VCEO = -40V, IC = -4A, SOT223, but hFE min = 100 only at IC = -100mA | Higher voltage headroom but lower gain at high current; less suitable for saturated gate drive at >2A | Select when higher VCEO margin is required over guaranteed high-current hFE |
| ROHM DTA144EET1G | Pre-biased PNP in SOT-323, VCEO = -50V, IC = -100mA - not a direct power replacement | Designed for logic-level switching only; lacks thermal capacity and current rating for gate driving | Use only in low-power signal switching where SOT223 footprint and -3A capability are unnecessary |
Compared with NSS40501MUTBG and DTA144EET1G, FZT749QTA uniquely balances -25V rating, -3A continuous current, low VCE(sat), and AEC-Q101 qualification - making it optimal for automotive gate drivers requiring both reliability and thermal efficiency in SOT223.
Availability
FZT749QTA is available at Aetrix Electronics and suitable for automotive gate driving, industrial motor control, power supply sequencing, and LED driver current sinking requiring stable component supply and AEC-Q101-compliant sourcing.
Supply support for FZT749QTA 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.
The FZT749QTA belongs to Diodes' automotive-qualified bipolar transistor product line, engineered specifically for high-reliability power switching in harsh-environment applications including engine control, body electronics, and ADAS subsystems.
FAQ
What is the maximum allowable junction temperature for FZT749QTA?
The FZT749QTA has an operating junction temperature range of -55°C to +150°C per its absolute maximum ratings. This rating is validated under AEC-Q101 stress testing and applies to continuous operation when thermal design maintains TJ within limits using appropriate PCB copper area and airflow.
Is FZT749QTA pin-compatible with FZT649?
No - FZT749QTA (PNP) and FZT649 (NPN) are complementary devices with identical SOT223 package outlines and pin assignments (E-B-C-tab), but opposite polarity. Their pinouts match mechanically and layout-wise, enabling symmetric push-pull driver PCB designs without footprint changes.
Does FZT749QTA require a base current limiting resistor in gate-drive applications?
Yes - because it is a current-controlled BJT, a series base resistor is required to set IB for desired IC. For -1A collector current, typical IB = -100mA implies ~10Ω at -1V VBE(sat); resistor value must account for driver voltage, VBE(on), and required hFE margin to ensure saturation.
Can FZT749QTA be used in linear regulator applications?
Yes - its -3A IC rating, 3.0W power dissipation (with adequate copper), and stable hFE support linear pass-element use. However, VCE(sat) is specified only in saturation; for linear operation, VCE > 1V is typical, requiring thermal analysis based on actual VIN–VOUT drop and load current.
FZT749QTA 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):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 25 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 300mA, 3A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1A, 2V
- Power - Max:
- 1.2 W
- Frequency - Transition:
- 160MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
FZT749QTA FAQ
1.How can I place an order for FZT749QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT749QTA 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 FZT749QTA reliable?
The price and inventory of FZT749QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT749QTA is usually 5 days.
3.What payment methods are accepted for FZT749QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT749QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT749QTA?
FZT749QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT749QTA 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 FZT749QTA?
For technical support, including FZT749QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT749QTA requirements.
6.How does Aetrix verify that FZT749QTA is sourced from the original manufacturer or authorized distributors?
All FZT749QTA 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 FZT749QTA meets industry standards.
7.What is the process for return or replacement of FZT749QTA?
All FZT749QTA units undergo pre-shipment inspection (PSI). If there is an issue with FZT749QTA, 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 FZT749QTA part is unused and in its original packaging.
Return procedure for FZT749QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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