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

onsemi FZT3019

Name: FZT3019
Brand: onsemi
SKU: FZT3019
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FZT3019

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: FZT3019.pdf

Description:: TRANS NPN 80V 1A SOT-223-4

Quantity:: RFQ Add To RFQ list

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Inventory:4,257

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Product details

Overview

FZT3019 from ON Semiconductor is an NPN general-purpose amplifier transistor rated for continuous collector current up to 1.0 A, collector-emitter voltage up to 80 V, and junction temperature range of −55 °C to +150 °C. It is optimized for medium-power linear amplification and switching in industrial power supplies, motor drivers, and LED ballasts.

For engineers reviewing the FZT3019 datasheet, pinout, applications, or equivalent options, key selection considerations include its 100 MHz f_T, 12 pF C_ob, 1.0 W power dissipation on FR-4 PCB, SOT-223 package thermal performance, and DC current gain ranging from 15 to 300 across 1 mA–1 A operating range.

Technical Context

The FZT3019 is a silicon planar epitaxial NPN bipolar junction transistor fabricated using Fairchild's Process 12. It delivers stable DC current gain (h_FE) from 50 at 0.1 mA to 15 at 1.0 A, with V_CE(sat) ≤ 0.5 V at I_C = 500 mA / I_B = 50 mA.

Its small-signal characteristics include f_T = 100 MHz at I_C = 50 mA, noise figure of 4.0 dB at 1 kHz, and input capacitance (C_ibo) of 60 pF - supporting audio-frequency amplification and moderate-speed switching up to ~10 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - supports operation in 48 V industrial bus and 60 V peak-switching applications without breakdown.
I_C (continuous)	1.0 A - enables direct drive of solenoids, relays, and low-voltage DC motors without external buffering.
f_T	100 MHz - sufficient for wideband audio preamplifiers and Class AB output stages up to 20 kHz with margin.
R_θJA	125 °C/W - requires ≥600 mm² copper pad on FR-4 for full 1.0 W dissipation at ambient ≤75 °C.
C_ob	12 pF - limits high-frequency Miller effect in common-emitter switch designs above 5 MHz.
NF	4.0 dB @ 1 kHz - suitable for low-noise microphone preamp stages where signal integrity below 10 kHz is critical.

Pinout & Package

SOT-223 package with exposed collector tab for thermal conduction; 4-pin outline (pin 4 is collector tab), standard JEDEC MO-178 variant. Mounting pad area specified as 600 mm² for thermal rating compliance.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal; requires current-limited drive (e.g., 50 mA max base current for 500 mA collector switching).
2	Collector	Main power terminal; electrically connected to exposed metal tab for heatsinking and current return path.
3	Emitter	Reference terminal; tied to ground or low-side return in common-emitter configurations.
4	Collector Tab	Thermal and electrical extension of pin 2; must be soldered to ≥600 mm² copper pour for rated power handling.

Key Features

Feature	Design Value
High V_CBO	140 V - allows safe operation under inductive load flyback transients in relay/motor control circuits.
Wide h_FE range	15–300 - accommodates both precision biasing (low I_C) and robust saturation switching (high I_C) in same design.
Low V_BE(sat)	1.1 V @ 150 mA - reduces base drive power loss and simplifies logic-level interface with microcontrollers.
Low noise figure	4.0 dB @ 1 kHz - enables use in analog sensor signal conditioning without added op-amp stages.

Applications

Industrial Power Supply	DC Motor Driver
Use Scenario: Regulated 24 V/500 mA linear pass transistor in low-noise lab power supply. IC Role / Device Role / Timing Role: NPN series pass element controlling output voltage via feedback loop. Use Value: 0.5 V V_CE(sat) at 500 mA minimizes dropout and thermal load vs. higher-V_CE(sat) alternatives.	Use Scenario: H-bridge low-side switch driving 12 V brushed DC motor (I_pk = 800 mA). IC Role / Device Role / Timing Role: Switching transistor in PWM-controlled motor driver stage. Use Value: 100 MHz f_T ensures clean turn-off at 20 kHz PWM without tail current delay.
LED Constant-Current Ballast	Audio Output Stage
Use Scenario: Linear current regulator for 350 mA high-brightness LED string in architectural lighting. IC Role / Device Role / Timing Role: Adjustable constant-current sink with sense-resistor feedback. Use Value: Stable h_FE down to 15 at 1 A enables accurate current setting across temperature without trimming.	Use Scenario: Class AB emitter-follower output buffer in 2 W audio amplifier. IC Role / Device Role / Timing Role: Low-output-impedance driver delivering <1% THD into 8 Ω load. Use Value: 4.0 dB noise figure and 60 pF C_ibo preserve SNR and bandwidth in mid-band audio reproduction.

Industrial Power Supply

DC Motor Driver

Use Scenario: Regulated 24 V/500 mA linear pass transistor in low-noise lab power supply.

IC Role / Device Role / Timing Role: NPN series pass element controlling output voltage via feedback loop.

Use Value: 0.5 V V_CE(sat) at 500 mA minimizes dropout and thermal load vs. higher-V_CE(sat) alternatives.

Use Scenario: H-bridge low-side switch driving 12 V brushed DC motor (I_pk = 800 mA).

IC Role / Device Role / Timing Role: Switching transistor in PWM-controlled motor driver stage.

Use Value: 100 MHz f_T ensures clean turn-off at 20 kHz PWM without tail current delay.

LED Constant-Current Ballast

Audio Output Stage

Use Scenario: Linear current regulator for 350 mA high-brightness LED string in architectural lighting.

IC Role / Device Role / Timing Role: Adjustable constant-current sink with sense-resistor feedback.

Use Value: Stable h_FE down to 15 at 1 A enables accurate current setting across temperature without trimming.

Use Scenario: Class AB emitter-follower output buffer in 2 W audio amplifier.

IC Role / Device Role / Timing Role: Low-output-impedance driver delivering <1% THD into 8 Ω load.

Use Value: 4.0 dB noise figure and 60 pF C_ibo preserve SNR and bandwidth in mid-band audio reproduction.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZTX653	Higher V_CEO (100 V), lower f_T (80 MHz), same SOT-223 package.	Better suited for 72 V bus systems; less optimal for >15 kHz switching.	Select ZTX653 when higher breakdown voltage is required and bandwidth <15 MHz suffices.
MJD31C	TO-220 package, higher P_D (1.5 W), lower h_FE min (10), V_CE(sat) = 1.2 V @ 3 A.	Requires heatsink; better for >1 A continuous loads but less space-efficient.	Choose MJD31C only when >1 A average current or forced-air cooling is available.

Compared with ZTX653 and MJD31C, the FZT3019 offers the best balance of 100 MHz bandwidth, 1.0 A capability, and SOT-223 footprint - making it preferred for compact, medium-frequency, medium-power linear and switching roles where thermal management is constrained.

Availability

FZT3019 is available at Aetrix Electronics and suitable for industrial power supplies, DC motor drivers, LED ballasts, and audio output stages requiring stable component supply and long-term manufacturability.

Supply support for FZT3019 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The FZT3019 belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, originally developed by Fairchild for cost-sensitive, medium-power linear and switching applications demanding reliability and thermal robustness in compact packages.

FAQ

What is the maximum continuous collector current rating for the FZT3019?

The FZT3019 is rated for 1.0 A continuous collector current at T_A = 25 °C with proper PCB thermal management (600 mm² copper pad). Derating applies above 25 °C at 8.0 mW/°C, limiting usable current to ~500 mA at 75 °C ambient. This rating is confirmed in the Absolute Maximum Ratings table of the FZT3019 Rev. B datasheet.

Does the FZT3019 have a built-in base-emitter resistor?

No, the FZT3019 is a standard discrete NPN bipolar transistor without any integrated base resistors. It requires external base current limiting and biasing circuitry, as shown in typical application schematics for amplifier and switch configurations. This distinguishes it from digital transistors like the NSBC114 series, which integrate resistors.

What is the thermal resistance junction-to-ambient (R_θJA) for the FZT3019?

The FZT3019 has R_θJA = 125 °C/W when mounted on a standard FR-4 PCB with a 36 mm × 18 mm board size and a 600 mm² copper mounting pad for the collector tab. This value assumes natural convection and is measured per JEDEC JESD51-2. Exceeding this thermal resistance risks junction temperature exceeding 150 °C under full 1.0 W dissipation.

Can the FZT3019 be used in audio amplifier output stages?

Yes, the FZT3019 is suitable for Class AB audio output stages up to ~2 W into 8 Ω, supported by its 4.0 dB noise figure at 1 kHz, 100 MHz f_T, and low V_CE(sat). Its h_FE variation across current ensures stable quiescent bias, and the SOT-223 package allows direct heatsinking. The FZT3019 datasheet includes small-signal gain and capacitance data validated for audio-frequency design.

Is the FZT3019 RoHS compliant and halogen-free?

Yes, the FZT3019 is RoHS compliant and halogen-free per ON Semiconductor's product change notices and material declarations. As a Fairchild-integrated part now under ON Semiconductor, it meets JEDEC JS-709B and IEC 61249-2-21 requirements. Full compliance documentation is available via ON Semiconductor's website using the FZT3019 part number.

FZT3019 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

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

Current - Collector Cutoff (Max):: 10nA (ICBO)

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

Power - Max:: 1 W

Frequency - Transition:: 100MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223-4

FZT3019 FAQ

1.How can I place an order for FZT3019 through Aetrix?

Please submit a Request for Quotation (RFQ) for FZT3019 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 FZT3019 reliable?

The price and inventory of FZT3019 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT3019 is usually 5 days.

3.What payment methods are accepted for FZT3019?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT3019 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FZT3019?

FZT3019 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FZT3019 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 FZT3019?

For technical support, including FZT3019 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT3019 requirements.

6.How does Aetrix verify that FZT3019 is sourced from the original manufacturer or authorized distributors?

All FZT3019 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 FZT3019 meets industry standards.

7.What is the process for return or replacement of FZT3019?

All FZT3019 units undergo pre-shipment inspection (PSI). If there is an issue with FZT3019, 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 FZT3019 part is unused and in its original packaging.

Return procedure for FZT3019:

1.Submit a request within 90 days.

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

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