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

Diodes Incorporated FCX718TA

Name: FCX718TA
Brand: Diodes Incorporated
SKU: FCX718TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FCX718TA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: FCX718TA.pdf

Description:: TRANS PNP 20V 2.5A SOT-89-3

Quantity:: RFQ Add To RFQ list

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Inventory:875

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Product details

Overview

FCX718TA from Diodes Incorporated is a PNP silicon power switching transistor in SOT89 package, rated for -20V V_CEO, -2.5A continuous collector current, and V_CE(sat) ≤ -40mV at -100mA. It delivers low on-resistance (R_sat = 96mΩ) and supports automotive-grade thermal operation from -55°C to +150°C, used in DC-DC converter output stages and load switch circuits.

For engineers reviewing the FCX718TA datasheet, FCX718TA pinout, FCX718TA application, or FCX718TA equivalent, key selection criteria include verified PNP switching capability, SOT89 thermal performance under pulsed and continuous loads, saturation voltage behavior across I_C = -0.1A to -2.5A, and AEC-Q101 readiness for automotive power control designs.

Technical Context

This device operates as a medium-power PNP bipolar junction transistor optimized for high-current, low-saturation switching. Its design emphasizes fast turn-on/turn-off (t_on = 40ns, t_off = 670ns) and stable h_FE of 300 at I_C = -10mA with V_CE = -2V, supporting robust base-driven switching in regulated power paths.

The SOT89 package enables 1W dissipation on 15mm × 15mm FR4 PCBs and up to 2W on larger copper areas, while its -20V breakdown ratings (V_CBO, V_CEO, V_EBO) define safe operating limits for 12V automotive and industrial rail-switching applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-20V - Maximum allowable collector-emitter voltage before breakdown in common-emitter configuration
I_C (continuous)	-2.5A - Continuous collector current rating defining steady-state power switching capacity
V_CE(sat)	-40mV @ -100mA - Low saturation voltage enabling <100mW conduction loss at light load
R_sat	96mΩ - Equivalent on-resistance derived from V_CE(sat)/I_C, critical for thermal management
f_T	150MHz - Transition frequency confirming suitability for high-speed switching up to ~10MHz
t_off	670ns - Turn-off delay limiting maximum practical switching frequency to ~1.5MHz
T_J range	-55°C to +150°C - Junction temperature range qualifying for under-hood automotive environments

Pinout & Package

Package: SOT89 - Surface-mount plastic case with exposed emitter tab for thermal conduction; 0.05g mass; UL 94V-0 rated molding compound; matte tin-plated leads.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Connected to ground or low-side return path; tab is electrically tied to emitter for thermal and electrical continuity
Collector (C)	High-side current source	Connects to positive supply rail; carries full load current when saturated
Base (B)	Control input	Receives negative drive current to forward-bias BE junction and enable conduction between C and E

Key Features

Feature	Design Value
Low V_CE(sat)	-40mV at -100mA ensures minimal conduction loss in battery-powered load switches
High I_C rating	-2.5A continuous current supports >3W load switching without external heatsinking on standard PCBs
Fast switching	40ns turn-on and 670ns turn-off times enable efficient operation in 100kHz–1MHz DC-DC topologies
AEC-Q101 readiness	Manufactured in IATF 16949 facilities with PPAP capability-supports automotive qualification pathways
Green compliance	Halogen- and antimony-free, RoHS 3 compliant (<900ppm Br/Cl, <1000ppm Sb), suitable for eco-sensitive designs

Applications

Automotive Door Module Power Switch

Industrial 24V PLC Output Stage

Use Scenario: Controlling window lift motors and mirror actuators in 12V vehicle door modules.

IC Role / Device Role / Timing Role: PNP high-side switch driving inductive loads with flyback protection via integrated clamp diode (external).

Use Value: -40mV V_CE(sat) minimizes heat generation during frequent actuation cycles, extending module lifetime.

Use Scenario: Switching solenoid valves and indicator LEDs in programmable logic controller output cards.

IC Role / Device Role / Timing Role: Discrete load switch replacing mechanical relays for solid-state reliability and faster response.

Use Value: 670ns t_off enables precise timing control of valve dwell time within 1ms PLC scan cycles.

USB-C Power Delivery Load Switch

Medical Infusion Pump Motor Driver

Use Scenario: Enabling/disabling VBUS power paths in USB-C PD sink adapters with overcurrent protection.

IC Role / Device Role / Timing Role: Current-controlled PNP switch placed between input capacitor and downstream buck converter.

Use Value: 96mΩ R_sat reduces insertion loss below 50mV at 500mA, preserving PD negotiation voltage margins.

Use Scenario: Driving small brushed DC motors in battery-operated infusion pumps requiring silent, low-EMI operation.

IC Role / Device Role / Timing Role: Linear-mode current limiter during motor startup, transitioning to saturated switch during steady state.

Use Value: Stable h_FE ≥ 150 at I_C = -2A ensures predictable base drive requirements across temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZTX788B	V_CEO = -30V, I_C = -2A, V_CE(sat) = -100mV @ -1A - higher voltage rating but higher saturation loss	Better for 24V systems; less efficient at 12V due to higher conduction loss	Select when V_CEO margin >10V is required and thermal headroom permits higher V_CE(sat)
MMDT3906	SOT-363 dual PNP, I_C = -200mA per device, V_CE(sat) = -100mV @ -10mA - lower current, smaller package	Suitable for signal-level switching only; not rated for >500mA continuous loads	Choose only for low-power bias networks or dual-channel logic inversion-not for power switching

Compared with ZTX788B and MMDT3906, FCX718TA uniquely balances -2.5A current handling, -40mV ultra-low saturation, and SOT89 thermal capability-making it optimal for space-constrained 12V power switches where efficiency and reliability are co-prioritized.

Availability

FCX718TA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC outputs, and medical portable equipment requiring stable component supply and traceable green manufacturing.

Supply support for FCX718TA 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 the Americas.

The FCX718TA belongs to Diodes' power transistor product line, engineered specifically for high-reliability, medium-current switching in automotive and industrial power management systems where thermal robustness and low-loss conduction are essential.

FAQ

What is the maximum safe operating voltage for FCX718TA in a 12V automotive system?

The FCX718TA has a V_CEO rating of -20V and V_CBO of -20V, making it suitable for nominal 12V systems with transient spikes up to ±20V. It must not be used in circuits where collector-emitter reverse voltage exceeds -20V, including inductive kickback scenarios without clamping.

Does FCX718TA require a base resistor, and how is its value calculated?

Yes - a series base resistor is mandatory to limit IB and prevent damage. For I_C = -2.5A and h_FE = 30 at that current, minimum IB = -83mA is needed. With V_BE(sat) ≈ -1.1V and drive voltage of -5V, R_B ≈ 47Ω (standard value) ensures reliable saturation while staying within the -500mA absolute max IB rating.

Can FCX718TA be used in linear (non-saturated) amplifier configurations?

No - it is optimized for switching, not linear amplification. Its h_FE drops sharply above I_C = -1A, and f_T is specified only at -50mA. The datasheet provides no small-signal parameters (e.g., r_π, g_m) or linearity data, and thermal derating in linear mode is not characterized.

Is FCX718TA qualified to AEC-Q101, and what documentation supports this claim?

FCX718TA is manufactured in IATF 16949-certified facilities and supports PPAP; however, Diodes states AEC-Q101 qualification requires specific change control and customer engagement. No public AEC-Q101 test report is published for this part - qualification must be confirmed directly with Diodes for automotive programs.

FCX718TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 2.5 A

Voltage - Collector Emitter Breakdown (Max):: 20 V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 200mA, 2.5A

Current - Collector Cutoff (Max):: 100nA

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

Power - Max:: 2 W

Frequency - Transition:: 180MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-3

FCX718TA FAQ

1.How can I place an order for FCX718TA through Aetrix?

Please submit a Request for Quotation (RFQ) for FCX718TA 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 FCX718TA reliable?

The price and inventory of FCX718TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FCX718TA is usually 5 days.

3.What payment methods are accepted for FCX718TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FCX718TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FCX718TA?

FCX718TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FCX718TA 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 FCX718TA?

For technical support, including FCX718TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FCX718TA requirements.

6.How does Aetrix verify that FCX718TA is sourced from the original manufacturer or authorized distributors?

All FCX718TA 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 FCX718TA meets industry standards.

7.What is the process for return or replacement of FCX718TA?

All FCX718TA units undergo pre-shipment inspection (PSI). If there is an issue with FCX718TA, 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 FCX718TA part is unused and in its original packaging.

Return procedure for FCX718TA:

1.Submit a request within 90 days.

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

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