Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi TN3019A

Name: TN3019A
Brand: onsemi
SKU: TN3019A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: TN3019A

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: TN3019A.pdf

Description:: TRANS NPN 80V 1A TO-226-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,920

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

TN3019A from Fairchild Semiconductor is an NPN general-purpose amplifier transistor designed for medium-power linear amplification and switching applications, with V_CEO = 80 V, I_C = 1.0 A continuous, and f_T = 100 MHz. It operates across –55°C to +150°C and delivers h_FE ≥ 50 at I_C = 150 mA, supporting audio preamplifiers, relay drivers, and DC-DC converter switches.

For engineers reviewing the TN3019A datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-226AE package, 125°C/W junction-to-case thermal resistance, 0.2 V V_CE(sat) at I_C = 150 mA/ I_B = 15 mA, and verified noise figure of 4.0 dB at 1 kHz - all critical for low-distortion analog gain stages and fast-switching control circuits.

Technical Context

The TN3019A employs a silicon planar epitaxial process (Process 12) optimized for balanced gain, speed, and ruggedness in general-purpose bipolar operation. Its h_FE spans 15–300 across I_C = 0.1 mA to 1.0 A, and small-signal h_fe reaches 400 at 1 kHz, enabling stable biasing in Class-A amplifiers and predictable saturation in switch-mode designs.

Thermal design is constrained by R_θJA = 50°C/W and R_θJC = 125°C/W, requiring heatsinking above ~300 mW dissipation. Switching performance is characterized by t_r, t_f, t_d, and t_s curves up to 1 A, with V_BE(sat) = 1.1 V at I_C = 10 mA/I_B = 15 mA confirming robust base drive capability.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum safe collector-emitter voltage before breakdown; defines rail voltage headroom in amplifier and switch designs.
I_C (continuous)	1.0 A - Continuous collector current rating; supports medium-power loads without derating below 25°C.
f_T	100 MHz - Unity-gain bandwidth; enables RF-capable amplification up to ~20 MHz with usable gain.
h_FE @ 150 mA	100 min - DC current gain at mid-range current; ensures reliable base drive sizing for switching applications.
V_CE(sat)	0.2 V @ I_C=150 mA/I_B=15 mA - Low saturation voltage minimizes conduction loss in power switches.
NF	4.0 dB @ 1 kHz - Measured noise figure; suitable for low-noise preamplifier stages in audio and sensor interfaces.
R_θJA	50°C/W - Junction-to-ambient thermal resistance in free-air; determines required PCB copper area or heatsink for thermal management.

Pinout & Package

Package: TO-226AE (standard 3-lead through-hole package, flat side facing viewer, leads arranged E-B-C left-to-right when viewed from bottom).

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Reference node for bias networks; connects to ground or low-side load return path.
2 (Base)	Control input	Receives current-limited drive signal; requires series resistor to limit I_B per h_FE and V_BE(sat).
3 (Collector)	Current source terminal	Connects to positive supply or load high-side; handles full I_C and V_CEO stress during switching.

Key Features

Feature	Design Value
High f_T / wide bandwidth	100 MHz f_T enables stable small-signal amplification up to 20 MHz with >10 dB gain margin.
Low V_CE(sat)	0.2 V saturation voltage at 150 mA reduces power loss by >60% vs. typical 0.5 V devices in switching mode.
Wide temperature range	–55°C to +150°C operating range supports industrial and automotive under-hood environments without derating.
Low noise performance	4.0 dB noise figure at 1 kHz allows use in microphone preamps and precision sensor signal conditioning.
Robust breakdown ratings	140 V V_CBO and 80 V V_CEO provide 20%+ voltage margin over 60 V rail systems, improving reliability.

Applications

Audio Preamplifier Stage	Relay Driver Circuit
Use Scenario: Amplifying low-level microphone or line-level signals prior to ADC sampling in embedded audio systems. IC Role / Device Role / Timing Role: NPN transconductance amplifier configured in common-emitter topology with emitter degeneration. Use Value: 4.0 dB NF and h_FE ≥ 100 at 10–100 mA ensure high SNR and stable gain without oscillation.	Use Scenario: Driving 12 V/500 mA electromagnetic relays in PLC I/O modules and industrial control panels. IC Role / Device Role / Timing Role: Medium-power saturated switch controlling relay coil current with fast turn-on/turn-off. Use Value: 0.2 V V_CE(sat) and 100 MHz f_T enable <500 ns switching transitions and <100 mW coil-drive loss.
DC-DC Converter Switch	Linear Voltage Regulator Pass Element
Use Scenario: Low-side switching element in non-synchronous buck converters operating up to 500 kHz. IC Role / Device Role / Timing Role: Pulse-width modulated current switch synchronizing with external controller and freewheeling diode. Use Value: 1.0 A I_C rating and 125°C/W R_θJC support 300 mA average output with minimal heatsink.	Use Scenario: Series pass transistor in adjustable linear regulators delivering up to 700 mA at 5–12 V output. IC Role / Device Role / Timing Role: Continuously biased active element dissipating variable power based on input-output differential. Use Value: 80 V V_CEO accommodates 24 V input rails; 1.0 W P_D at 25°C enables 500 mW dissipation with standard PCB copper.

Audio Preamplifier Stage

Relay Driver Circuit

Use Scenario: Amplifying low-level microphone or line-level signals prior to ADC sampling in embedded audio systems.

IC Role / Device Role / Timing Role: NPN transconductance amplifier configured in common-emitter topology with emitter degeneration.

Use Value: 4.0 dB NF and h_FE ≥ 100 at 10–100 mA ensure high SNR and stable gain without oscillation.

Use Scenario: Driving 12 V/500 mA electromagnetic relays in PLC I/O modules and industrial control panels.

IC Role / Device Role / Timing Role: Medium-power saturated switch controlling relay coil current with fast turn-on/turn-off.

Use Value: 0.2 V V_CE(sat) and 100 MHz f_T enable <500 ns switching transitions and <100 mW coil-drive loss.

DC-DC Converter Switch

Linear Voltage Regulator Pass Element

Use Scenario: Low-side switching element in non-synchronous buck converters operating up to 500 kHz.

IC Role / Device Role / Timing Role: Pulse-width modulated current switch synchronizing with external controller and freewheeling diode.

Use Value: 1.0 A I_C rating and 125°C/W R_θJC support 300 mA average output with minimal heatsink.

Use Scenario: Series pass transistor in adjustable linear regulators delivering up to 700 mA at 5–12 V output.

IC Role / Device Role / Timing Role: Continuously biased active element dissipating variable power based on input-output differential.

Use Value: 80 V V_CEO accommodates 24 V input rails; 1.0 W P_D at 25°C enables 500 mW dissipation with standard PCB copper.

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
MPSA42	V_CEO = 300 V, I_C = 500 mA, f_T = 50 MHz, TO-92 package	Higher voltage rating but lower current and bandwidth; unsuitable for >500 mA switching	Select when primary need is high-voltage isolation (>100 V) over current drive or speed
2N2222A	V_CEO = 40 V, I_C = 800 mA, f_T = 250 MHz, TO-18 package	Lower voltage rating but higher f_T; limited to ≤40 V rails and low-power RF	Select when circuit operates ≤30 V and requires faster switching than TN3019A provides

Compared with MPSA42 and 2N2222A, the TN3019A uniquely balances 80 V breakdown, 1.0 A current, and 100 MHz bandwidth in a TO-226AE package - making it optimal for 12–48 V industrial switching and mid-bandwidth analog gain where both voltage headroom and thermal robustness matter.

Availability

TN3019A is available at Aetrix Electronics and suitable for industrial motor controls, programmable logic controllers, and embedded audio systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TN3019A 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The TN3019A belongs to Fairchild's general-purpose bipolar transistor family engineered for cost-effective, thermally robust amplification and switching in industrial and consumer equipment.

FAQ

What is the maximum continuous collector current rating for the TN3019A?

The TN3019A has a maximum continuous collector current (I_C) rating of 1.0 A at T_A = 25°C. This rating decreases with rising ambient temperature due to its 8.0 mW/°C derating factor above 25°C, and actual usable current depends on PCB layout, heatsinking, and duty cycle in pulsed applications.

Does the TN3019A support switching applications, and what are its key switching parameters?

Yes, the TN3019A is qualified for switching use, with documented t_r, t_f, t_d, and t_s curves up to 1 A. Its V_CE(sat) = 0.2 V at I_C = 150 mA/I_B = 15 mA and f_T = 100 MHz support clean transitions in DC-DC and relay driver circuits operating below 500 kHz.

What package type does the TN3019A use, and how are its pins arranged?

The TN3019A uses the TO-226AE package - a 3-lead through-hole variant with leads formed straight. When viewed from the bottom with the flat side facing up, the pin order is Emitter (1), Base (2), Collector (3) left to right. Pin 1 is identified by the first wire lead off the die.

What is the thermal resistance specification for the TN3019A, and how does it impact PCB design?

The TN3019A has R_θJA = 50°C/W (junction-to-ambient) and R_θJC = 125°C/W (junction-to-case). To maintain T_J ≤ 150°C at 1.0 W dissipation, the PCB must provide ≥250 mm² of 2-oz copper connected to the collector lead, or a small clip-on heatsink should be used for sustained >300 mW operation.

Is the TN3019A suitable for low-noise audio applications, and what is its measured noise figure?

Yes, the TN3019A is specified for low-noise operation with a noise figure (NF) of 4.0 dB at I_C = 100 mA, V_CE = 10 V, R_S = 1.0 kΩ, and f = 1.0 kHz. This makes the TN3019A appropriate for microphone preamplifiers and sensor front-ends where SNR > 60 dB is required.

TN3019A Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

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:: Through Hole

Supplier Device Package:: TO-226-3

TN3019A FAQ

1.How can I place an order for TN3019A through Aetrix?

Please submit a Request for Quotation (RFQ) for TN3019A 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 TN3019A reliable?

The price and inventory of TN3019A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TN3019A is usually 5 days.

3.What payment methods are accepted for TN3019A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TN3019A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TN3019A?

TN3019A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TN3019A 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 TN3019A?

For technical support, including TN3019A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TN3019A requirements.

6.How does Aetrix verify that TN3019A is sourced from the original manufacturer or authorized distributors?

All TN3019A 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 TN3019A meets industry standards.

7.What is the process for return or replacement of TN3019A?

All TN3019A units undergo pre-shipment inspection (PSI). If there is an issue with TN3019A, 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 TN3019A part is unused and in its original packaging.

Return procedure for TN3019A:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…