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Diodes Incorporated FZT749TC
- Part No.:
- FZT749TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT749TC.pdf
- Description:
- TRANS PNP 25V 3A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,785
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Product details
Overview
FZT749TC from Diodes Incorporated is a 25V PNP medium-power transistor in SOT223 package, rated for -3A continuous collector current and -8A peak pulse current, with VCE(sat) < -300mV at -1A, designed specifically for MOSFET and IGBT gate driving circuits in motor control and power conversion systems.
For engineers reviewing the FZT749TC datasheet, FZT749TC pinout, FZT749TC application, or FZT749TC equivalent, key selection considerations include its -25V VCEO, low saturation voltage under high-current switching, thermal resistance of 41.7°C/W (50mm × 50mm copper), complementary pairing with FZT649, and automotive-grade variant (FZT749Q) availability.
Technical Context
This PNP bipolar junction transistor operates in linear and saturated switching modes, with DC current gain (hFE) ranging from 15 to 570 depending on collector current (100–6000mA), and features fT = 100–160MHz for moderate-frequency switching applications up to several hundred kHz.
Its safe operating area (SOA) supports pulsed operation up to 100ms at -25V/–3A, and thermal design relies on lead-mounted dissipation-RθJL = 12.9°C/W enables efficient heat transfer from junction to solder point on PCBs with optimized copper land patterns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -25V - Maximum allowable collector-emitter voltage before breakdown during normal operation. |
| IC (cont.) | -3A - Continuous collector current rating defining steady-state drive capability for gate drivers. |
| VCE(sat) | -0.12V to -0.6V - Low saturation voltage ensures minimal conduction loss when fully turned on. |
| hFE | 70–570 - Wide DC current gain range enables flexible base drive design across load currents. |
| fT | 100–160MHz - Transition frequency supporting fast turn-on/turn-off (ton = 40ns, toff = 450ns). |
| RθJA | 41.7°C/W - Thermal resistance with 50mm × 50mm 2oz copper defines maximum power dissipation in still air. |
| ESD HBM | 4000V - Human Body Model ESD rating indicates robustness against handling-induced electrostatic discharge. |
Pinout & Package
Package: SOT223 (Type DN), surface-mount, 3-terminal plastic molded package with exposed collector tab for thermal and electrical connection; weight ≈ 0.112g; RoHS-compliant matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current output terminal | Exposed metal tab - electrically connected to collector and serves as primary thermal path to PCB copper. |
| Emitter (E) | Current return path | Carries full load current back to supply rail; tied to ground or negative rail in high-side switch configurations. |
| Base (B) | Control input | Receives current-limited drive signal to bias transistor into saturation or cutoff; requires ~100mA for -1A IC. |
Key Features
| Feature | Design Value |
|---|---|
| High peak pulse current | ICM = -8A enables short-duration surge handling in gate-drive transients without failure. |
| Low VCE(sat) | < -300mV @ -1A reduces conduction losses and self-heating during active switching phases. |
| Complementary NPN pairing | Direct match with DIODES™ FZT649 simplifies dual-polarity gate driver design and layout symmetry. |
| Automotive-qualified variant | FZT749Q meets AEC-Q101 requirements, enabling drop-in qualification path for automotive gate drivers. |
| Green compound packaging | Halogen- and antimony-free molding compound (Br+Cl < 1500ppm, Sb < 1000ppm) satisfies environmental compliance mandates. |
Applications
| Motor Control Gate Driving | DC-DC Converter High-Side Switching |
|---|---|
Use Scenario: Driving gates of N-channel MOSFETs in half-bridge motor drivers for BLDC or stepper motors. IC Role / Device Role / Timing Role: PNP switch providing active pull-down and fast turn-off of high-side gate node. Use Value: Low VCE(sat) minimizes power loss during gate discharge; 450ns toff supports PWM frequencies up to 100kHz. |
Use Scenario: Level-shifting and gate control in synchronous buck converters with high-side N-MOSFETs. IC Role / Device Role / Timing Role: Fast-switching PNP transistor used in discrete bootstrap gate driver stage. Use Value: 160MHz fT and 40ns ton ensure precise timing alignment between high- and low-side switches. |
| IGBT Base Drive Amplification | Industrial PLC Output Stage |
Use Scenario: Amplifying microcontroller GPIO signals to deliver sufficient base current for IGBT turn-on in inverters. IC Role / Device Role / Timing Role: Medium-power current amplifier interfacing logic-level controllers with high-gain IGBTs. Use Value: hFE ≥ 100 at -1A ensures reliable saturation with modest base drive, reducing MCU I/O loading. |
Use Scenario: Discrete output stage in programmable logic controller modules driving 24V solenoids or relays. IC Role / Device Role / Timing Role: Robust PNP switch delivering up to -3A sustained load current with overcurrent tolerance. Use Value: -8A ICM withstands relay coil inrush; RθJA = 41.7°C/W allows operation at 70°C ambient without heatsink. |
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 |
|---|---|---|---|
| ZXTN25050DFH | Higher VCEO (-50V), lower IC (-2A), SOT89 package, higher RθJA (62.5°C/W) | Better suited for higher-voltage industrial controls but less ideal for high-current gate drive due to lower IC and thermal limits | Select when system voltage exceeds 30V and board space permits SOT89 mounting. |
| MJD2955T4G | TO-220 package, -7A IC, -60V VCEO, slower switching (toff > 1µs), higher VCE(sat) (-1.2V @ -4A) | Designed for linear regulation and high-power audio, not optimized for fast gate driving | Prefer only when mechanical mounting and heat sinking support TO-220, and speed is secondary to current capacity. |
Compared with ZXTN25050DFH and MJD2955T4G, FZT749TC offers superior balance of current drive (-3A), speed (40ns/450ns), thermal performance (41.7°C/W), and SOT223 footprint-making it optimal for compact, high-efficiency gate driver designs where board area and switching loss are critical.
Availability
FZT749TC is available at Aetrix Electronics and suitable for motor control gate driving, DC-DC converter high-side switching, and industrial PLC output stages requiring stable component supply, consistent SOT223 packaging, and RoHS-compliant manufacturing.
Supply support for FZT749TC 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 components for industrial, computing, consumer, and automotive markets.
FZT749TC belongs to Diodes' medium-power bipolar transistor product line, engineered for high-current, fast-switching applications such as MOSFET/IGBT gate drivers where low saturation voltage and robust SOA are essential.
FAQ
What is the maximum continuous collector current for FZT749TC?
The FZT749TC is rated for -3A continuous collector current at TA = +25°C with proper PCB copper area (50mm × 50mm, 2oz). Derating applies above 25°C ambient-power dissipation drops linearly to zero at +150°C junction temperature per the specified derating curve.
Is FZT749TC pin-compatible with FZT649?
No-FZT749TC (PNP) and FZT649 (NPN) are complementary types, not pin-compatible. Their SOT223 pinouts differ: FZT749TC has Collector-Base-Emitter (C-B-E) arrangement, while FZT649 uses Emitter-Base-Collector (E-B-C); layout must account for reversed polarity and terminal assignment.
Can FZT749TC be used in automotive applications?
The standard FZT749TC is not AEC-Q101 qualified, but Diodes offers the automotive-compliant FZT749Q variant-identical electrical specs and SOT223 package, with additional stress testing and PPAP documentation required for automotive use.
What is the recommended PCB pad layout for thermal performance?
For optimal thermal performance, Diodes specifies a minimum pad layout with 25mm × 25mm 2oz copper for RθJA = 62.5°C/W, and recommends 50mm × 50mm 2oz copper to achieve the rated 41.7°C/W; the exposed collector tab must be soldered directly to this copper area using at least three thermal vias.
FZT749TC 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:
- 2 W
- Frequency - Transition:
- 160MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT749TC FAQ
1.How can I place an order for FZT749TC through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT749TC 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 FZT749TC reliable?
The price and inventory of FZT749TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT749TC is usually 5 days.
3.What payment methods are accepted for FZT749TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT749TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT749TC?
FZT749TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT749TC 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 FZT749TC?
For technical support, including FZT749TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT749TC requirements.
6.How does Aetrix verify that FZT749TC is sourced from the original manufacturer or authorized distributors?
All FZT749TC 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 FZT749TC meets industry standards.
7.What is the process for return or replacement of FZT749TC?
All FZT749TC units undergo pre-shipment inspection (PSI). If there is an issue with FZT749TC, 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 FZT749TC part is unused and in its original packaging.
Return procedure for FZT749TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FZT749TC Tags
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