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

Diodes Incorporated FZT2222ATA

Name: FZT2222ATA
Brand: Diodes Incorporated
SKU: FZT2222ATA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FZT2222ATA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: FZT2222ATA.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:4,979

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Product details

Overview

FZT2222ATA from Diodes Incorporated is an NPN silicon planar switching transistor in SOT-223 package, rated for 40 V V_CEO, 600 mA I_C, and 2 W P_tot, with f_T = 300 MHz and V_CE(sat) = 0.3 V at I_C = 150 mA / I_B = 15 mA. It serves as a medium-power general-purpose switch in DC-DC converter control stages, LED driver current sinks, and microcontroller-driven load interfaces.

For engineers reviewing the FZT2222ATA datasheet, FZT2222ATA pinout, FZT2222ATA application, or FZT2222ATA equivalent, key selection criteria include verified V_CE(sat) at 150 mA, h_FE range of 35–300 across I_C = 0.1 mA to 500 mA, thermal rating up to +150°C junction, and SOT-223 thermal performance under pulsed switching conditions.

Technical Context

This discrete NPN bipolar junction transistor operates in active or saturation mode for digital switching and linear amplification. Its 75 V V_CBO, 40 V V_CEO, and 6 V V_EBO support robust voltage margin in 24 V industrial bus interfaces and flyback snubber circuits.

With f_T = 300 MHz at I_C = 20 mA / V_CE = 20 V and measured switching times (t_d = 10 ns, t_r = 25 ns, t_s = 225 ns, t_f = 60 ns), it delivers predictable turn-on/turn-off behavior in PWM-driven loads below 1 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C (continuous)	600 mA - Continuous DC collector current handling capability at T_amb = 25°C
P_tot	2 W - Total power dissipation limit with adequate PCB copper area for SOT-223 thermal pad
f_T	300 MHz - Unity-gain frequency confirming usable bandwidth for sub-MHz switching and RF bias applications
V_CE(sat)	0.3 V @ I_C=150 mA, I_B=15 mA - Low saturation voltage enabling <0.045 W conduction loss in high-duty-cycle switches
h_FE	35–300 - Wide DC current gain range across operating points, supporting both low-base-drive and precision-current-mirror use cases
t_s + t_f	285 ns - Combined storage + fall time defining minimum off-time in hard-switched topologies

Pinout & Package

SOT-223 package with exposed thermal pad (pin 4) and standard three-terminal layout: emitter (pin 1), base (pin 2), collector (pin 3). Pin 4 is internally connected to collector and must be soldered to PCB copper for thermal management.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (E)	Emitter	Current return path; referenced to ground or negative rail in low-side switch configurations
Pin 2 (B)	Base	Control input requiring ~15 mA drive for full saturation at 150 mA collector load
Pin 3 (C)	Collector	High-side connection point for switched load; electrically tied to pin 4 (thermal pad)
Pin 4 (Tab)	Collector (thermal)	Exposed metal pad for heatsinking; must be soldered to ≥1 cm² copper pour for 2 W operation

Key Features

Feature	Design Value
Fast switching performance	25 ns rise time and 60 ns fall time enable clean edges in 500 kHz PWM control loops
High-temperature operation	Junction temperature range –55°C to +150°C supports deployment in automotive engine compartments and industrial enclosures
Low V_CE(sat)	0.3 V at I_C/I_B = 10 ensures minimal conduction loss in battery-powered 3.3 V/5 V logic-driven switches
Complementary pairing	Matched with FZT2907A (PNP) for push-pull output stages and H-bridge half-bridges
Robust voltage ratings	V_CBO = 75 V provides 87% headroom above 40 V V_CEO, reducing risk of avalanche failure during inductive kick

Applications

LED Constant-Current Sink

Microcontroller GPIO Expander

Use Scenario: Driving high-brightness white LEDs from 12 V supply with PWM dimming at 1 kHz.

IC Role / Device Role / Timing Role: NPN switch sinking LED cathode current; base driven directly by MCU GPIO.

Use Value: V_CE(sat) ≤ 0.3 V minimizes power loss and thermal rise at 350 mA LED current.

Use Scenario: Extending 3.3 V microcontroller I/O to drive 5 V relay coils or solenoids.

IC Role / Device Role / Timing Role: Level-shifting and current amplification stage between low-voltage logic and higher-power loads.

Use Value: h_FE ≥ 100 at I_C = 10 mA ensures reliable saturation with 0.1 mA base drive.

DC-DC Converter Switch

Industrial Sensor Interface

Use Scenario: Low-side switch in non-synchronous buck converter operating at 250 kHz.

IC Role / Device Role / Timing Role: Main power switch controlling energy transfer to output inductor.

Use Value: t_s + t_f = 285 ns limits minimum off-time, enabling stable operation down to 40% duty cycle.

Use Scenario: Isolating and conditioning analog sensor outputs in 24 V PLC I/O modules.

IC Role / Device Role / Timing Role: Active pull-down element in voltage-level translation and fault-signaling circuits.

Use Value: V_EBO = 6 V and T_j = +150°C rating ensure reliability in noisy industrial environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT2222ALT1G	SOT-23 package, lower P_tot (350 mW), V_CEO = 40 V, h_FE min = 100 @ I_C = 10 mA	Not suitable for >200 mA continuous loads due to thermal limitation	Select when board space is constrained and load current ≤ 150 mA
ZTX653	SOT-89 package, P_tot = 2.5 W, V_CEO = 60 V, f_T = 150 MHz, V_CE(sat) = 0.5 V @ I_C = 1 A	Higher voltage margin but slower switching and higher saturation loss	Select when 60 V bus compatibility and higher current (>600 mA) are required

Compared with MMBT2222ALT1G and ZTX653, FZT2222ATA uniquely balances 600 mA current capability, 2 W dissipation in SOT-223, and 300 MHz f_T, making it optimal for thermally demanding yet speed-sensitive 24 V industrial switching where SOT-23 is insufficient and SOT-89 over-specifies.

Availability

FZT2222ATA is available at Aetrix Electronics and suitable for industrial motor controls, programmable logic controller (PLC) I/O modules, and automotive body electronics requiring stable component supply and long-term manufacturability.

Supply support for FZT2222ATA 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 centers across Asia and manufacturing in China, Taiwan, and Malaysia.

FZT2222ATA belongs to the FZT series of high-reliability SOT-223 transistors engineered for industrial-grade switching, offering extended temperature range and validated pulse switching performance.

FAQ

Is FZT2222ATA pin-compatible with the legacy PN2222A?

No. FZT2222ATA uses SOT-223 packaging with four terminals (E-B-C-Tab), while PN2222A is TO-18 or TO-92 with three leads. Pin mapping differs: SOT-223 pin 1 = E, pin 2 = B, pin 3 = C; TO-92 assigns E-B-C to pins 1-2-3. Physical and thermal interface requirements are not interchangeable.

What is the maximum allowable continuous collector current at 85°C ambient?

At T_amb = 85°C, derating applies: P_tot reduces linearly from 2 W at 25°C to zero at 150°C. With θ_JA ≈ 65°C/W (standard 2-layer PCB), max I_C is limited by V_CE(sat) × I_C ≤ derated power. For V_CE(sat) = 0.4 V, practical I_C is ~450 mA at 85°C ambient.

Does FZT2222ATA support avalanche energy rating?

No official single-pulse avalanche energy (E_AS) rating is specified in the datasheet. The device is characterized for V_CEO = 40 V and V_CBO = 75 V under DC and pulsed conditions only. Inductive switching must include external clamping (e.g., flyback diode) to avoid unclamped inductive switching (UIS) stress.

Can FZT2222ATA be used in linear amplifier configurations?

Yes - h_FE is specified from I_C = 0.1 mA to 500 mA, and V_CE = 1–10 V test conditions confirm stable gain in active region. However, its primary characterization focuses on switching parameters (t_d, t_r, t_s, t_f); for precision analog use, dedicated small-signal transistors like BC847BW are better optimized.

FZT2222ATA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Digi-Reel®

Product Status:: Obsolete

Transistor Type:: NPN

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

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

Vce Saturation (Max) @ Ib, Ic:: 1V @ 50mA, 500mA

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 10V

Power - Max:: 2 W

Frequency - Transition:: 300MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223-3

FZT2222ATA FAQ

1.How can I place an order for FZT2222ATA through Aetrix?

Please submit a Request for Quotation (RFQ) for FZT2222ATA 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 FZT2222ATA reliable?

The price and inventory of FZT2222ATA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT2222ATA is usually 5 days.

3.What payment methods are accepted for FZT2222ATA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT2222ATA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FZT2222ATA?

FZT2222ATA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FZT2222ATA 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 FZT2222ATA?

For technical support, including FZT2222ATA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT2222ATA requirements.

6.How does Aetrix verify that FZT2222ATA is sourced from the original manufacturer or authorized distributors?

All FZT2222ATA 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 FZT2222ATA meets industry standards.

7.What is the process for return or replacement of FZT2222ATA?

All FZT2222ATA units undergo pre-shipment inspection (PSI). If there is an issue with FZT2222ATA, 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 FZT2222ATA part is unused and in its original packaging.

Return procedure for FZT2222ATA:

1.Submit a request within 90 days.

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

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