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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated FZT749QTC

Name: FZT749QTC
Brand: Diodes Incorporated
SKU: FZT749QTC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FZT749QTC

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-261-4, TO-261AA

Datasheet:: FZT749QTC.pdf

Description:: TRANS PNP 25V 3A SOT-223

Quantity:: RFQ Add To RFQ list

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Inventory:8,312

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Product details

Overview

FZT749QTC 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 V_CE(sat) < -300mV at -1A, designed specifically for MOSFET and IGBT gate driving in automotive systems.

For engineers reviewing the FZT749QTC datasheet, FZT749QTC pinout, FZT749QTC application, or FZT749QTC equivalent, key selection criteria include AEC-Q101 qualification, low saturation voltage under high-current switching, thermal resistance (R_θJA = 41.7°C/W on 50mm × 50mm 2oz copper), and complementary pairing with FZT649 NPN.

Technical Context

This PNP BJT operates as a high-current switch with strict automotive-grade reliability: it delivers -3A continuous output while maintaining V_CE(sat) ≤ -0.3V at -1A/−100mA drive, and supports fast switching with t_on = 40ns and t_off = 450ns under defined pulsed conditions (≤300µs, ≤2% duty).

Its safe operating area (SOA) is validated up to -25V V_CEO and -8A I_CM, with thermal design enabled by R_θJL = 12.9°C/W (junction-to-lead) and compliance to J-STD-020 moisture sensitivity Level 1 - critical for reflow-soldered automotive control modules.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-25V - Maximum allowable collector-emitter voltage before breakdown in common-emitter configuration.
I_C	-3A - Continuous DC collector current capability without thermal derating on standard PCB layout.
V_CE(sat)	-0.12V (typ) @ -1A/-100mA - Ensures minimal conduction loss during active switching in gate-drive stages.
h_FE	70–200 @ -50mA - Sufficient DC gain for reliable base-driven switching without excessive drive power.
f_T	100–160MHz - Supports high-frequency switching control in motor drivers and power converters.
R_θJA	41.7°C/W - Thermal resistance enabling 3.0W dissipation on 50mm × 50mm 2oz copper FR4 at +25°C ambient.
AEC-Q101	Qualified - Meets stress-test requirements for automotive discrete transistors including temperature cycling, HTRB, and ESD.

Pinout & Package

Package: SOT223 (Type DN), surface-mount, 4-pin outline with collector tab (pin 3) electrically connected to collector terminal and used for thermal conduction.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Current sink node; connects to load return path in high-side switch configurations.
2 (Base)	Control input	Receives negative bias current to turn on PNP; requires external current-limiting resistor.
3 (Collector)	Main power output	Connected to collector tab for enhanced thermal transfer; ties to positive rail in gate-drive applications.
4 (Collector Tab)	Collector extension	Electrically identical to pin 3; soldered to large copper pour for heat dissipation and mechanical stability.

Key Features

Feature	Design Value
Low V_CE(sat)	-0.12V typ at -1A ensures <300mW conduction loss per device in gate-drive paths.
AEC-Q101 qualification	Validated for automotive use with PPAP capability and IATF16949 manufacturing certification.
Complementary pairing	Matched performance with FZT649 NPN enables balanced push-pull driver designs.
Green packaging	Halogen- and antimony-free molding compound (Br+Cl <1500ppm, Sb <1000ppm) meets automotive environmental standards.

Applications

Automotive Motor Control

Industrial Gate Drivers

Use Scenario: Driving high-side gates of N-channel MOSFETs in 12V/24V BLDC motor inverters.

IC Role / Device Role / Timing Role: PNP switch providing fast, low-loss pull-up for gate voltage during PWM transitions.

Use Value: V_CE(sat) ≤ -0.3V at -3A minimizes power loss and thermal rise in compact motor control modules.

Use Scenario: Level-shifting and current amplification in isolated IGBT gate driver circuits.

IC Role / Device Role / Timing Role: High-current PNP buffer stage translating logic-level signals to ±15V gate drive rails.

Use Value: 450ns turn-off time and SOA robustness support reliable switching at 20kHz+ in industrial inverters.

Automotive Lighting Systems

Power Supply Sequencing

Use Scenario: Controlling LED headlamp arrays via constant-current regulation with PWM dimming.

IC Role / Device Role / Timing Role: High-side current switch enabling precise current sourcing to LED strings.

Use Value: AEC-Q101 qualification and -55°C to +150°C operating range ensure reliability in under-hood environments.

Use Scenario: Enabling/disabling auxiliary power rails in multi-rail automotive ECUs.

IC Role / Device Role / Timing Role: Power sequencing switch managing controlled ramp-up of downstream LDOs and microcontrollers.

Use Value: -8A peak pulse rating accommodates inrush currents during cold-start power-up sequences.

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 NSS40201MR6T1G	SOT223 PNP, V_CEO = -40V, I_C = -2A, V_CE(sat) = -0.25V @ -1A	Higher voltage rating but lower current capability; not AEC-Q101 qualified	Select when higher breakdown margin is needed and automotive qualification is not required.
ROHM 2SAR542PT100	SOT223 PNP, V_CEO = -50V, I_C = -2A, V_CE(sat) = -0.2V @ -1A, AEC-Q101 qualified	Lower continuous current rating (-2A vs -3A); tighter V_CE(sat) tolerance but reduced SOA	Prefer for space-constrained designs where -2A suffices and tighter saturation spec improves efficiency.

Compared with NSS40201MR6T1G and 2SAR542PT100, FZT749QTC uniquely balances -3A continuous current, AEC-Q101 compliance, and sub-300mV saturation voltage - making it optimal for thermally demanding automotive gate-drive applications where both current and qualification are non-negotiable.

Availability

FZT749QTC is available at Aetrix Electronics and suitable for automotive motor control, industrial gate drivers, and power supply sequencing requiring stable component supply across extended production lifecycles.

Supply support for FZT749QTC 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with operations certified to IATF16949 and ISO9001 standards.

The FZT749QTC belongs to Diodes' automotive-qualified bipolar transistor product line, engineered for high-reliability power switching in engine control units, lighting systems, and battery management interfaces.

FAQ

What is the maximum allowable junction temperature for FZT749QTC?

The FZT749QTC has an operating junction temperature range of -55°C to +150°C. Its absolute maximum T_J is +150°C, verified per AEC-Q101 stress testing. Derating begins above +25°C ambient based on R_θJA = 41.7°C/W (50mm × 50mm 2oz copper), requiring thermal design to maintain T_J ≤ 150°C under worst-case power dissipation.

Is FZT749QTC pin-compatible with FZT749QTA?

Yes - FZT749QTC and FZT749QTA share identical SOT223 (Type DN) package, pinout, and electrical specifications. The only difference is packaging: QTC uses 13-inch reels with 4,000 units, while QTA uses 7-inch reels with 1,000 units. Both are fully interchangeable at the board level.

Does FZT749QTC require a heatsink in typical gate-drive applications?

In most gate-drive applications delivering ≤1A average collector current with 20–50% duty cycle, no external heatsink is required when mounted on ≥25mm × 25mm 2oz copper. However, at full -3A continuous load, thermal simulation shows T_J exceeds 150°C without additional copper area or airflow - so PCB copper pour optimization is essential instead of discrete heatsinks.

How does the FZT749QTC's ESD rating compare to standard industrial transistors?

FZT749QTC achieves 4,000V HBM (JEDEC Class 3A) and 400V MM ESD ratings - exceeding typical industrial-grade BJTs (often 2kV HBM). This robustness is validated per JESD22-A114/A115 and supports handling in automotive assembly lines without special ESD controls beyond standard Class 1A practices.

FZT749QTC 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

FZT749QTC FAQ

1.How can I place an order for FZT749QTC through Aetrix?

Please submit a Request for Quotation (RFQ) for FZT749QTC 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 FZT749QTC reliable?

The price and inventory of FZT749QTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT749QTC is usually 5 days.

3.What payment methods are accepted for FZT749QTC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT749QTC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FZT749QTC?

FZT749QTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FZT749QTC 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 FZT749QTC?

For technical support, including FZT749QTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT749QTC requirements.

6.How does Aetrix verify that FZT749QTC is sourced from the original manufacturer or authorized distributors?

All FZT749QTC 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 FZT749QTC meets industry standards.

7.What is the process for return or replacement of FZT749QTC?

All FZT749QTC units undergo pre-shipment inspection (PSI). If there is an issue with FZT749QTC, 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 FZT749QTC part is unused and in its original packaging.

Return procedure for FZT749QTC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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