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Diodes Incorporated FZT1149ATA
- Part No.:
- FZT1149ATA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT1149ATA.pdf
- Description:
- TRANS PNP 25V 4A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:13,830
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Product details
Overview
FZT1149ATA from Diodes Incorporated is a 25V PNP medium-power high-gain transistor in SOT223 package, rated for -4A continuous collector current, -25V VCEO, and featuring RCE(sat) = 130 mΩ at -2A. It delivers hFE ≥ 195 @ -2A/-2V and meets AEC-Q101 for automotive-grade reliability, commonly used in DC-DC converter output stages and motor driver high-side switches.
For engineers reviewing the FZT1149ATA datasheet, FZT1149ATA pinout, FZT1149ATA application, or FZT1149ATA equivalent, key selection criteria include verified PNP saturation voltage at high current, thermal resistance to ambient under defined copper area, gain stability across 0.1–4A, and SOT223 lead-frame thermal performance in power switching layouts.
Technical Context
This PNP bipolar junction transistor operates in linear or saturated switching mode with guaranteed breakdown ratings: VCBO = -30V, VCEO = -25V, and VEBO = -7V. Its fT = 135 MHz supports fast turn-on/turn-off (ton = 150 ns, toff = 270 ns) under pulsed conditions (300 µs, ≤2% duty cycle).
Thermal design relies on validated RθJA values: 41.7°C/W (52 mm × 52 mm, 2 oz Cu), scaling to 104°C/W on minimum pad layout. RθJL = 10.9°C/W enables direct thermal path conduction through the collector lead to PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -25 V - Maximum safe collector-emitter voltage before avalanche in common-emitter configuration |
| IC (cont.) | -4 A - Continuous DC current handling capacity with derated power above +25°C ambient |
| RCE(sat) | 130 mΩ @ -2A - Low on-resistance enables <0.52 W conduction loss at full rated current |
| hFE | 195 min @ -2A/-2V - High, stable DC current gain ensures robust base drive margin in switching applications |
| toff | 270 ns - Fast turn-off time critical for high-frequency PWM control in power converters |
| RθJA | 41.7 °C/W - Thermal resistance with 52 mm × 52 mm 2 oz Cu defines heatsinking requirement for 3 W dissipation |
| ESD HBM | 4000 V - Robust electrostatic discharge immunity per JEDEC JESD22-A114, suitable for automated assembly |
Pinout & Package
SOT223 package with exposed collector tab for thermal and electrical connection; molded green compound (UL 94V-0), matte tin-plated leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current source terminal | Connected to higher potential rail; carries full load current in high-side switch configuration |
| Base (B) | Control input | Receives negative drive current to saturate transistor; requires ~140 mA for full -4A conduction |
| Collector (C) | Output / power return | Internally connected to exposed metal tab; must be soldered to large copper pour for thermal management |
| Tab (Collector) | Thermal & electrical node | Primary heat path to PCB; electrically identical to Collector pin; not isolated |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power electronics per stress test requirements including HTOL, TC, and ESD |
| High hFE at high current | 195 minimum at -2A ensures low base drive power and simplified gate-driver interface |
| Low RCE(sat) | 130 mΩ at -2A reduces conduction losses by >30% vs. standard PNP transistors in same package |
| Exposed collector tab | Enables direct thermal coupling to PCB copper, achieving RθJL = 10.9°C/W for efficient heat extraction |
| Green, RoHS-compliant | Halogen- and antimony-free formulation (<900 ppm Br/Cl, <1000 ppm Sb) meets global environmental compliance mandates |
Applications
| Automotive LED Headlamp Driver | Industrial DC-DC Converter Output Stage |
|---|---|
Use Scenario: High-side current switch controlling 12V/3A LED arrays in adaptive front lighting systems. IC Role / Device Role / Timing Role: PNP power switch operating in saturation mode, driven by microcontroller GPIO via level-shifting circuit. Use Value: 130 mΩ RCE(sat) limits power loss to 0.52 W at full load, enabling compact thermally constrained headlamp housing design. | Use Scenario: Synchronous rectifier replacement in non-isolated buck converter supplying 5V@3A to industrial I/O modules. IC Role / Device Role / Timing Role: High-side PNP switch complementing N-channel MOSFET in dual-active topology for improved efficiency at light loads. Use Value: hFE ≥ 195 at -2A allows minimal base drive current, reducing auxiliary supply burden and improving no-load regulation. |
| Brushed DC Motor Control (H-Bridge High-Side) | Power Sequencing Circuit in Telecom Equipment |
Use Scenario: Upper-leg switch in 24V H-bridge driving 2A brushed motors in valve actuators. IC Role / Device Role / Timing Role: PNP transistor providing controlled turn-on/turn-off of motor phase with toff = 270 ns to minimize shoot-through risk. Use Value: Fast switching and -25V VCEO rating ensure reliable operation during inductive flyback transients up to -22V. | Use Scenario: Controlled power-up sequencing of FPGA and analog subsystems using discrete voltage-ramp enable logic. IC Role / Device Role / Timing Role: Precision current source/sink element in active delay and threshold-detection networks. Use Value: Tight hFE distribution (270–450 typ. @ -10mA) enables predictable base current setting for accurate timing thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN25050DFHTA | Higher VCEO (-50V), lower hFE (100 min @ -2A), SOT23 package (lower power capability) | Not suitable for 4A continuous loads; limited thermal mass and RθJA = 200°C/W restricts use to <0.5A | Select only for space-constrained, low-current bias or signal switching where voltage margin is primary concern |
| MJD2955T4G | TO-220 package, -7A rating, but RCE(sat) = 300 mΩ @ -4A and slower toff = 1.5 µs | Requires external heatsink; unsuitable for high-frequency (>20 kHz) PWM due to longer storage time | Prefer for high-current, low-frequency linear regulation where thermal mass outweighs switching speed needs |
Compared with ZXTN25050DFHTA and MJD2955T4G, FZT1149ATA uniquely balances 4A current capability, 130 mΩ saturation resistance, and 270 ns turn-off in a surface-mount SOT223 package-enabling compact, high-efficiency, automotive-qualified switching without heatsink dependency.
Availability
FZT1149ATA is available at Aetrix Electronics and suitable for automotive LED drivers, industrial DC-DC converters, brushed motor H-bridges, and telecom power sequencing requiring stable component supply and AEC-Q101 compliance.
Supply support for FZT1149ATA 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, specializing in high-reliability power management, signal integrity, and protection solutions.
The FZT series targets medium-power bipolar switching applications demanding AEC-Q101 qualification, low saturation voltage, and robust thermal performance in compact surface-mount packages.
FAQ
What is the maximum safe operating temperature for FZT1149ATA?
The FZT1149ATA has an operating junction temperature range of -55°C to +150°C. At +150°C, its maximum continuous power dissipation drops to 1.2 W (per derating curve on page 3 of DS33187 Rev. 2-2). Reliable operation requires maintaining TJ ≤ 150°C via adequate PCB copper area and airflow.
Does FZT1149ATA require a base resistor when driven by a microcontroller?
Yes - a series base resistor is mandatory to limit base current. For -4A collector current, typical required IB is -140 mA (hFE ≈ 28.5 at that point). With a 3.3V GPIO and VBE(sat) ≈ -1.0 V, a 16 Ω resistor sets appropriate drive; PCB layout must accommodate high-current base trace routing.
Can FZT1149ATA replace an NPN transistor in the same circuit?
No - it is a PNP device with opposite polarity and complementary biasing requirements. Replacing an NPN requires inverting the drive signal, reversing supply connections, and verifying all voltage margins (e.g., VCEO becomes VECO). Direct substitution without schematic revision will result in non-functional or damaged circuitry.
Is the SOT223 collector tab electrically isolated?
No - the exposed collector tab is internally bonded to the collector terminal and is not insulated. It must be treated as a live, high-current node and soldered directly to a dedicated copper pour tied to the collector net. Any isolation attempt violates the mechanical and thermal design intent and risks thermal runaway.
FZT1149ATA 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):
- 4 A
- Voltage - Collector Emitter Breakdown (Max):
- 25 V
- Vce Saturation (Max) @ Ib, Ic:
- 350mV @ 140mA, 4A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 250 @ 500mA, 2V
- Power - Max:
- 2.5 W
- Frequency - Transition:
- 135MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT1149ATA FAQ
1.How can I place an order for FZT1149ATA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT1149ATA 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 FZT1149ATA reliable?
The price and inventory of FZT1149ATA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT1149ATA is usually 5 days.
3.What payment methods are accepted for FZT1149ATA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT1149ATA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT1149ATA?
FZT1149ATA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT1149ATA 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 FZT1149ATA?
For technical support, including FZT1149ATA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT1149ATA requirements.
6.How does Aetrix verify that FZT1149ATA is sourced from the original manufacturer or authorized distributors?
All FZT1149ATA 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 FZT1149ATA meets industry standards.
7.What is the process for return or replacement of FZT1149ATA?
All FZT1149ATA units undergo pre-shipment inspection (PSI). If there is an issue with FZT1149ATA, 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 FZT1149ATA part is unused and in its original packaging.
Return procedure for FZT1149ATA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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