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Diodes Incorporated FZT949QTA
- Part No.:
- FZT949QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT949QTA.pdf
- Description:
- TRANS PNP 30V 5.5A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,296
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Product details
Overview
FZT949QTA from Diodes Incorporated is a 30V PNP medium-power transistor in SOT223 package, rated for -5.5A continuous collector current and -20A peak pulse current, with VCE(sat) < -140mV at -1A, hFE ≥ 75 at -5A, and qualified to AEC-Q automotive reliability standards. It serves as a high-current switching element in DC-DC converter output stages and motor driver H-bridge low-side legs.
For engineers reviewing the FZT949QTA datasheet, FZT949QTA pinout, FZT949QTA application, or FZT949QTA equivalent, key selection criteria include verified PNP saturation voltage under high IC, thermal resistance (RθJA = 42°C/W on 52mm × 52mm 2oz Cu), JEDEC-compliant reliability, and SOT223 lead-frame thermal performance for industrial power control designs.
Technical Context
This PNP bipolar junction transistor operates in linear and saturated switching modes, with BVCBO = -50V and BVCEO = -30V ensuring robust voltage blocking in negative-rail applications. Its hFE remains ≥35 at -20A, enabling stable gain hold-up during high-current pulses.
VCE(sat) is specified down to -440mV at -5.5A/–500mA IB, and fT = 100MHz supports fast switching in PWM-driven loads. The device features matte tin-plated leads, UL 94V-0 molding compound, and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -30V - Maximum safe collector-emitter reverse bias before breakdown in common-emitter configuration. |
| IC (cont.) | -5.5A - Continuous current handling capacity with derated power dissipation on standard PCB layout. |
| VCE(sat) | < -140mV @ -1A - Low conduction loss enabling efficient switching in high-current load paths. |
| hFE | 75–140 @ -5A - Confirmed current gain stability under sustained medium-power operation. |
| RθJA | 42°C/W - Thermal resistance enabling 3.0W dissipation at TA = +25°C with 52mm × 52mm 2oz Cu pad. |
| fT | 100MHz - Transition frequency supporting sub-100ns switching transitions in PWM circuits. |
| ESD HBM | 4,000V - Robust electrostatic discharge immunity per JEDEC JESD22-A114 Class 3A. |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 4-pin outline with exposed collector tab (pin 3) for thermal conduction. Molded green compound, UL 94V-0 rated, 0.112g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Emitter) | E | Current exit terminal; connected to most negative rail in PNP switch configurations. |
| Pin 2 (Base) | B | Control input requiring negative drive current to turn on; typical IB = -500mA for full saturation at IC = -5.5A. |
| Pin 3 (Collector) | C | Main current entry point; electrically and thermally tied to large copper pad for heat sinking. |
| Pin 4 (Collector Tab) | C (thermal) | Exposed metal tab - not electrically isolated; must be connected to system ground or negative rail for thermal and electrical continuity. |
Key Features
| Feature | Design Value |
|---|---|
| High current capability | -5.5A continuous / -20A pulsed enables use in 5–10W DC-DC output stages without paralleling. |
| Low VCE(sat) | < -140mV @ -1A reduces conduction losses by >40% vs. legacy PNP transistors in same package. |
| AEC-Q qualified | Complies with JEDEC reliability standards for automotive-grade power control modules. |
| Green packaging | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); RoHS 3 compliant with matte tin plating. |
| Thermal design support | RθJL = 8.8°C/W to solder point allows direct thermal path modeling for PCB layout optimization. |
Applications
| DC-DC Converter Output Stage | Industrial Motor Driver H-Bridge |
|---|---|
Use Scenario: High-efficiency buck converter output switch in 12V–24V industrial power supplies. IC Role / Device Role / Timing Role: PNP high-side switch controlling current flow into LC filter network during PWM off-cycle. Use Value: Low VCE(sat) minimizes dropout and improves efficiency above 92% at 3A load; SOT223 thermal pad sustains 2.5W dissipation. |
Use Scenario: Low-side switch in dual-H-bridge for 24V brushed DC motors in factory automation. IC Role / Device Role / Timing Role: Saturated PNP switch sinking current from motor winding during active braking or direction reversal. Use Value: hFE ≥ 35 at -20A ensures reliable turn-on with minimal base drive overhead; ESD HBM 4kV withstands factory ESD events. |
| Automotive LED Headlamp Driver | Programmable Current Sink for Precision Sensors |
Use Scenario: Constant-current sink for high-brightness LED arrays in AEC-Q-compliant headlamp modules. IC Role / Device Role / Timing Role: Linear-regulated current sink operating in active region with feedback-controlled base bias. Use Value: Tight hFE distribution (100–200 @ -10mA) enables accurate current mirroring; -55°C to +150°C rating supports under-hood operation. |
Use Scenario: Precision programmable load in sensor calibration fixtures and test equipment. IC Role / Device Role / Timing Role: Adjustable current sink with analog base control for 0–5A range in metrology-grade instruments. Use Value: VBE(on) = -900 to -1060mV at -5.5A enables stable setpoint accuracy; low Cobo = 122pF minimizes signal coupling in sensitive analog paths. |
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 |
|---|---|---|---|
| ZXTN19020CFFTA | Higher VCEO (-60V), lower IC (-3A), SOT89 package, RθJA = 100°C/W | Better voltage margin but limited thermal performance; unsuitable for >2W continuous dissipation | Select when higher breakdown voltage is critical and board space allows larger thermal pad or heatsink. |
| MJD2955T4G | TO-220 package, -10A IC, RθJA = 30°C/W, no automotive qualification | Higher power handling but through-hole mounting; lacks AEC-Q compliance and green material certification | Choose for legacy through-hole designs where PCB rework is constrained and automotive qualification is not required. |
Compared with ZXTN19020CFFTA and MJD2955T4G, FZT949QTA uniquely balances SMT manufacturability, AEC-Q reliability, 5.5A current capability, and 42°C/W thermal resistance in a compact SOT223 footprint-making it optimal for space-constrained, thermally demanding industrial and automotive power switches.
Availability
FZT949QTA is available at Aetrix Electronics and suitable for DC-DC converters, motor drivers, LED lighting systems, and precision current sinks requiring stable component supply across automotive, industrial, and test equipment programs.
Supply support for FZT949QTA 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.
FZT949QTA belongs to Diodes' high-reliability PNP transistor product line, engineered specifically for industrial and automotive power switching applications demanding robust thermal performance, AEC-Q qualification, and green material compliance.
FAQ
What is the maximum allowable junction temperature for FZT949QTA?
The absolute maximum operating junction temperature is +150°C, with storage temperature ranging from –55°C to +150°C. Derating begins at +25°C ambient, reducing maximum power dissipation by 24mW/°C on 52mm × 52mm 2oz Cu PCB, per datasheet Figure 2.
Is FZT949QTA pin-compatible with FZT949TA?
Yes - FZT949QTA and FZT949TA share identical SOT223 (Type DN) mechanical outline, pin assignment, and electrical specifications. The "Q" suffix denotes automotive qualification per AEC-Q standards, while "TA" indicates commercial-grade version; both use the same die and package construction.
Can FZT949QTA be used in linear regulator applications?
Yes - its hFE stability up to -20A and VBE(on) consistency (-900 to -1060mV at -5.5A) support precise current-source and series-pass transistor roles. However, linear operation requires careful thermal design due to RθJA = 42°C/W and PD = 3.0W limit on standard layout.
Does FZT949QTA require a heatsink in typical 5A switching applications?
Not necessarily - with proper PCB copper area (52mm × 52mm 2oz Cu), FZT949QTA dissipates up to 3.0W at +25°C ambient. At 5.5A with VCE(sat) ≈ -440mV, power dissipation is ~2.4W, remaining within safe limits without external heatsink under still-air conditions.
FZT949QTA 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):
- 5.5 A
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 440mV @ 500mA, 5.5A
- Current - Collector Cutoff (Max):
- 50nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1A, 1V
- Power - Max:
- 3 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT949QTA FAQ
1.How can I place an order for FZT949QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT949QTA 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 FZT949QTA reliable?
The price and inventory of FZT949QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT949QTA is usually 5 days.
3.What payment methods are accepted for FZT949QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT949QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT949QTA?
FZT949QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT949QTA 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 FZT949QTA?
For technical support, including FZT949QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT949QTA requirements.
6.How does Aetrix verify that FZT949QTA is sourced from the original manufacturer or authorized distributors?
All FZT949QTA 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 FZT949QTA meets industry standards.
7.What is the process for return or replacement of FZT949QTA?
All FZT949QTA units undergo pre-shipment inspection (PSI). If there is an issue with FZT949QTA, 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 FZT949QTA part is unused and in its original packaging.
Return procedure for FZT949QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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