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

Diodes Incorporated FZT4403TA

Name: FZT4403TA
Brand: Diodes Incorporated
SKU: FZT4403TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FZT4403TA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: FZT4403TA.pdf

Description:: TRANS PNP 40V 0.6A SOT-223-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,846

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Product details

Overview

FZT4403TA from Diodes Incorporated is a PNP silicon planar switching transistor in SOT-223 package, rated for -40 V V_CEO, -600 mA I_C, and 1.5 W P_tot at T_amb = 25°C; used in low-voltage DC-DC converter switching stages and relay driver circuits where fast turn-off and moderate current gain are required.

For engineers reviewing the FZT4403TA datasheet, FZT4403TA pinout, FZT4403TA application, or FZT4403TA equivalent, key selection criteria include verified V_CE(sat) ≤ -0.75 V at -500 mA/-50 mA drive, h_FE ≥ 20 at -500 mA, f_T = 200 MHz, and SOT-223 thermal performance under pulsed switching conditions.

Technical Context

This discrete PNP bipolar junction transistor operates in common-emitter configuration with base-controlled saturation switching. Its -40 V breakdown ratings support use in 24 V industrial control rails and automotive body electronics with transient margin.

Designed for pulsed operation (300 µs pulse width), it delivers stable h_FE from 20 to 300 across I_C = -0.1 mA to -500 mA and maintains f_T = 200 MHz at -50 mA collector current and -5 V V_CE, enabling reliable high-speed switching up to ~100 kHz in hard-switched topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-40 V: Maximum safe collector-emitter voltage before avalanche conduction in open-base condition.
I_C	-600 mA: Continuous DC collector current limit; supports relay coils up to 500 mA load with margin.
P_tot	1.5 W at T_amb = 25°C: Thermal dissipation capability with standard PCB copper area (≥1 cm²).
V_CE(sat)	-0.75 V at I_C = -500 mA, I_B = -50 mA: Confirmed low on-state loss for <1.5 W switching stage power loss.
f_T	200 MHz at I_C = -50 mA, V_CE = -5 V: Enables clean square-wave switching in sub-100 ns rise/fall time applications.
h_FE	20 min at I_C = -500 mA, V_CE = -2 V: Ensures sufficient current gain for direct microcontroller GPIO drive without external base amplifier.

Pinout & Package

SOT-223 package with exposed emitter pad for thermal enhancement; standardized 4-pin footprint (3 active + 1 thermal tab) compatible with JEDEC TO-261AA outline.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Main current return path	Connected to PCB ground plane via large copper pour; primary thermal conduction path.
2 (Base)	Current-controlled input	Receives negative drive current from controller; requires series resistor to limit I_B to ≤ -50 mA.
3 (Collector)	High-side switched output	Connects to load supply rail; handles full load current when saturated.
Tab (Emitter)	Thermal & electrical tie	Internally bonded to emitter; must be soldered to PCB ground for thermal and electrical integrity.

Key Features

Feature	Design Value
High V_CEO/V_CBO rating	-40 V enables use in 24 V systems with ISO 7637-2 pulse margin and inductive kick suppression.
Low V_CE(sat) at high I_C	-0.75 V at -500 mA reduces conduction loss to <375 mW, improving efficiency in battery-powered drivers.
Guaranteed h_FE down to -500 mA	Min 20 ensures single-stage drive compatibility with 3.3 V/5 V MCU outputs without base amplification.
200 MHz f_T	Supports clean switching waveforms in PWM frequencies up to 100 kHz with minimal overshoot.

Applications

Industrial Relay Driver

Automotive Door Lock Actuator

Use Scenario: Driving 24 V, 400 mA resistive-inductive relay coil in PLC I/O module.

IC Role / Device Role / Timing Role: PNP switch controlling coil current path to ground; turns off within 1 µs after base removal.

Use Value: -0.75 V V_CE(sat) limits coil power loss to 300 mW, reducing thermal stress on PCB traces.

Use Scenario: Controlling 12 V door lock solenoid (500 mA peak) in vehicle body control module.

IC Role / Device Role / Timing Role: High-side switch enabling reverse-polarity protected actuation with fast release timing.

Use Value: -40 V V_CEO withstands load dump transients per ISO 16750-2, eliminating need for external TVS.

DC-DC Converter Switch

LED String Current Sink

Use Scenario: Low-side switch in non-synchronous buck converter operating at 50 kHz, 12 V input.

IC Role / Device Role / Timing Role: Saturated PNP switch replacing NPN with inverted logic; driven by level-shifted gate signal.

Use Value: 200 MHz f_T ensures <50 ns storage time, minimizing dead-time losses during switching transitions.

Use Scenario: Constant-current sink for 3× white LEDs (9 V total V_F) in automotive interior lighting.

IC Role / Device Role / Timing Role: Linear-regulated current sink with base bias network setting I_LED = 350 mA.

Use Value: h_FE stability across -10 mA to -500 mA allows precise current regulation without feedback loop.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZTX603	V_CEO = -45 V, h_FE = 100–300 @ -500 mA, SOT-89 package	Higher gain but lower thermal mass; less suitable for sustained 500 mA continuous operation	Prefer for low-duty-cycle, high-gain logic-level drive where board space permits SOT-89.
MJD44H11T4G	V_CEO = -80 V, I_C = -8 A, TO-252 package, slower f_T (<10 MHz)	Over-specified voltage/current; excessive size and cost for 600 mA loads	Select only if system requires > -60 V breakdown or > 1 A surge handling; otherwise inefficient use of PCB area.

Compared with ZTX603 and MJD44H11T4G, FZT4403TA offers optimal balance of SOT-223 thermal performance, guaranteed -500 mA h_FE, and 200 MHz bandwidth-making it uniquely suited for compact, medium-frequency, medium-current switching where thermal and speed constraints intersect.

Availability

FZT4403TA is available at Aetrix Electronics and suitable for industrial relay drivers, automotive body electronics, DC-DC converter switches, and LED current sinks requiring stable component supply and consistent parametric performance across production lots.

Supply support for FZT4403TA 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, automotive, and computing markets.

FZT4403TA belongs to the FZT series of high-voltage PNP transistors engineered for robust switching in harsh-environment control systems with emphasis on thermal stability and parametric consistency.

FAQ

Is FZT4403TA suitable for continuous 600 mA DC operation?

No. The -600 mA rating is absolute maximum; continuous operation is limited to -500 mA per datasheet test conditions (T_amb = 25°C, P_tot ≤ 1.5 W). At full current, thermal derating applies above 25°C ambient-designers must verify junction temperature using θ_JA = 125°C/W and ensure PCB copper area meets minimum 1 cm² requirement.

What is the recommended base resistor value for driving FZT4403TA from a 5 V MCU GPIO?

For I_C = -500 mA and minimum h_FE = 20, required I_B = -25 mA. With V_BE(sat) ≈ -0.95 V, R_B = (5 V − 0.95 V) / 25 mA = 162 Ω. A standard 160 Ω ±5% resistor delivers -25.3 mA, ensuring saturation while staying within GPIO current limits.

Does FZT4403TA have built-in ESD protection?

No. The device has no integrated ESD protection diodes. Per datasheet, human-body model (HBM) rating is not specified, and layout best practices require external series resistance and/or TVS clamping on base and collector lines in environments with >2 kV ESD risk.

Can FZT4403TA replace FZT603 in the same PCB footprint?

No. FZT603 uses SOT-223 but has different pinout: pin 1 = collector, pin 2 = base, pin 3 = emitter. FZT4403TA uses pin 1 = emitter, pin 2 = base, pin 3 = collector. Direct replacement would short circuit; redesign of PCB routing and schematic is required.

FZT4403TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Digi-Reel®

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 600 mA

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 750mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 2V

Power - Max:: 1.5 W

Frequency - Transition:: 200MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223-3

FZT4403TA FAQ

1.How can I place an order for FZT4403TA through Aetrix?

Please submit a Request for Quotation (RFQ) for FZT4403TA 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 FZT4403TA reliable?

The price and inventory of FZT4403TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT4403TA is usually 5 days.

3.What payment methods are accepted for FZT4403TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT4403TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FZT4403TA?

FZT4403TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FZT4403TA 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 FZT4403TA?

For technical support, including FZT4403TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT4403TA requirements.

6.How does Aetrix verify that FZT4403TA is sourced from the original manufacturer or authorized distributors?

All FZT4403TA 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 FZT4403TA meets industry standards.

7.What is the process for return or replacement of FZT4403TA?

All FZT4403TA units undergo pre-shipment inspection (PSI). If there is an issue with FZT4403TA, 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 FZT4403TA part is unused and in its original packaging.

Return procedure for FZT4403TA:

1.Submit a request within 90 days.

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

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