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 2N4401RLRAG

Name: 2N4401RLRAG
Brand: onsemi
SKU: 2N4401RLRAG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 2N4401RLRAG

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body, Formed Leads

Datasheet:: 2N4401RLRAG.pdf

Description:: TRANS NPN 40V 0.6A TO92

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,797

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

Product details

Overview

2N4401RLRAG from onsemi is an NPN silicon general-purpose transistor in TO-92 package, rated for 40 V_CEO, 600 mA continuous collector current, and 625 mW power dissipation at 25°C ambient. It delivers DC current gain (h_FE) from 20 to 300 across 0.1–500 mA I_C, with f_T = 250 MHz, and is widely used in low-voltage switching and amplification circuits such as LED drivers and signal buffering.

For engineers reviewing the 2N4401RLRAG datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO/I_C rating margin, h_FE consistency at target bias, saturation voltage under drive conditions, thermal resistance (R_JA = 200°C/W), and Pb-free tape-and-reel packaging compliance.

Technical Context

The 2N4401RLRAG operates as a standard bipolar junction transistor with fixed-emitter configuration and base-controlled current amplification. Its design supports linear amplification (h_fe = 40–500 at 1 mA) and saturated switching (V_CE(sat) ≤ 0.4 V at I_C = 150 mA, I_B = 15 mA), with defined breakdown limits: V_(BR)CEO = 40 V, V_(BR)CBO = 60 V, and V_(BR)EBO = 6.0 V.

Thermal performance is characterized by R_JA = 200°C/W and R_JC = 83.3°C/W, enabling operation from −55°C to +150°C junction temperature. Switching behavior includes t_d ≤ 15 ns, t_r ≤ 20 ns, t_s ≤ 225 ns, and t_f ≤ 30 ns under specified test conditions (V_CC = 30 V, I_C/I_B = 10).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in switching designs.
I_C (continuous)	600 mA - Absolute max DC collector current; usable up to ~500 mA with derating above 25°C ambient.
P_D @ T_A = 25°C	625 mW - Power dissipation limit at room ambient; requires heatsinking or layout thermal relief above ~150 mW sustained.
h_FE range	20–300 - DC current gain spread across I_C = 0.1–500 mA; impacts base drive sizing and gain stability in amplifier stages.
f_T	250 MHz - Transition frequency at I_C = 20 mA, V_CE = 10 V; sets upper bound for small-signal amplification bandwidth.
V_CE(sat)	≤ 0.4 V @ I_C = 150 mA, I_B = 15 mA - Low saturation voltage minimizes conduction loss in switch-mode applications.
R_JA	200°C/W - Junction-to-ambient thermal resistance in free-air; determines temperature rise per watt dissipated on PCB.

Pinout & Package

Package: TO-92 (Case 29-11), straight-lead, Pb-free, tape-and-reel (2000 units). Dimensions per ANSI Y14.5M: body height 4.45–5.20 mm, lead pitch 2.54 mm, lead diameter 0.41–0.53 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal in NPN configuration	Connected to ground or low-side reference; base-emitter forward bias initiates conduction.
2 (Base)	Control input for minority-carrier injection	Requires current-limited drive (typically 1–50 mA); small-signal h_fe defines required I_B for target I_C.
3 (Collector)	Current source terminal in NPN configuration	Connected to load and supply rail; voltage swing limited by V_CEO and saturation behavior.

Key Features

Feature	Design Value
Pb-free construction	RoHS-compliant packaging per onsemi's Pb-Free strategy; suitable for environmentally regulated production.
High f_T	250 MHz enables use in audio preamps, RF detector stages, and fast-switching logic interfaces up to ~50 MHz.
Low V_CE(sat)	≤ 0.4 V at I_C/I_B = 10 ensures <100 mW conduction loss at 150 mA, improving efficiency in discrete switch designs.
Wide h_FE range	20–300 allows flexible biasing: high-gain for low-drive sensors, low-gain for stable switching with margin.
TO-92 tape-and-reel	2000-unit reel format supports automated SMT placement despite through-hole package; reduces handling and ESD risk.

Applications

LED Driver Circuit	Signal Level Shifting
Use Scenario: Driving 20–100 mA indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins. IC Role / Device Role / Timing Role: NPN switch controlling LED anode/cathode current path; operates in saturation region with fixed base resistor. Use Value: V_CE(sat) ≤ 0.4 V ensures >95% of supply voltage reaches LED, minimizing wasted power and thermal stress.	Use Scenario: Translating logic signals between 3.3 V and 5 V domains in mixed-voltage digital systems. IC Role / Device Role / Timing Role: Active-low level shifter using emitter-follower or common-emitter inversion; relies on h_FE ≥ 40 for clean edge transitions. Use Value: f_T = 250 MHz supports rise/fall times < 20 ns, preserving signal integrity up to 10 Mbps data rates.
Audio Pre-amplifier Stage	Relay/Small Solenoid Driver
Use Scenario: Low-noise voltage amplification of microphone or sensor outputs in battery-powered audio front-ends. IC Role / Device Role / Timing Role: Common-emitter amplifier biased at I_C = 0.1–1 mA; uses h_fe = 100–200 for stable mid-band gain. Use Value: Input impedance h_ie = 1–15 kΩ matches typical electret mic output impedance, minimizing signal loss.	Use Scenario: Controlling 12 V, 100–400 mA relay coils or miniature solenoids from MCU outputs. IC Role / Device Role / Timing Role: High-current saturated switch; base driven via 1 kΩ resistor from 5 V GPIO. Use Value: I_C = 600 mA rating provides 2× margin over typical 300 mA coil loads, ensuring long-term reliability.

LED Driver Circuit

Signal Level Shifting

Use Scenario: Driving 20–100 mA indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins.

IC Role / Device Role / Timing Role: NPN switch controlling LED anode/cathode current path; operates in saturation region with fixed base resistor.

Use Value: V_CE(sat) ≤ 0.4 V ensures >95% of supply voltage reaches LED, minimizing wasted power and thermal stress.

Use Scenario: Translating logic signals between 3.3 V and 5 V domains in mixed-voltage digital systems.

IC Role / Device Role / Timing Role: Active-low level shifter using emitter-follower or common-emitter inversion; relies on h_FE ≥ 40 for clean edge transitions.

Use Value: f_T = 250 MHz supports rise/fall times < 20 ns, preserving signal integrity up to 10 Mbps data rates.

Audio Pre-amplifier Stage

Relay/Small Solenoid Driver

Use Scenario: Low-noise voltage amplification of microphone or sensor outputs in battery-powered audio front-ends.

IC Role / Device Role / Timing Role: Common-emitter amplifier biased at I_C = 0.1–1 mA; uses h_fe = 100–200 for stable mid-band gain.

Use Value: Input impedance h_ie = 1–15 kΩ matches typical electret mic output impedance, minimizing signal loss.

Use Scenario: Controlling 12 V, 100–400 mA relay coils or miniature solenoids from MCU outputs.

IC Role / Device Role / Timing Role: High-current saturated switch; base driven via 1 kΩ resistor from 5 V GPIO.

Use Value: I_C = 600 mA rating provides 2× margin over typical 300 mA coil loads, ensuring long-term reliability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC547B	Lower V_CEO (45 V vs. 40 V), higher h_FE min (200 vs. 20), same TO-92 package but different pinout (E-B-C vs. E-B-C confirmed identical for 2N4401RLRAG Style 2).	Slightly better gain consistency at low I_C; less margin at high V_CE due to tighter 45 V rating.	Prefer BC547B when designing new circuits requiring guaranteed h_FE ≥ 200 at 2 mA; verify pin compatibility if reusing legacy 2N4401 layouts.
MPS2222A	Higher P_D (1 W @ T_C = 25°C), same V_CEO (40 V), wider h_FE range (100–300), TO-92 package with identical pinout (Style 2: E-B-C).	Better thermal headroom for sustained >300 mA loads; faster switching (t_s = 150 ns vs. 225 ns) improves PWM efficiency.	Select MPS2222A for high-duty-cycle switching or elevated ambient temperature environments (>50°C); no PCB change needed.

Compared with BC547B and MPS2222A, the 2N4401RLRAG offers lower cost and broader h_FE tolerance for non-critical biasing, while maintaining proven reliability in industrial control and consumer electronics where 600 mA/40 V margins suffice.

Availability

2N4401RLRAG is available at Aetrix Electronics and suitable for LED driver circuits, signal level shifting, audio pre-amplifiers, and relay/solenoid drivers requiring stable component supply, RoHS compliance, and tape-and-reel automation support.

Supply support for 2N4401RLRAG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 2N4401RLRAG belongs to onsemi's legacy general-purpose transistor product line, designed for cost-sensitive, high-volume applications demanding robust DC and switching performance in through-hole and automated assembly environments.

FAQ

What is the maximum collector current rating for the 2N4401RLRAG?

The 2N4401RLRAG has a maximum continuous collector current (I_C) rating of 600 mA at T_A = 25°C. Derating is required above this temperature-5.0 mW/°C-and practical operation is typically limited to 500 mA or less with adequate PCB copper area for heat dissipation. The 2N4401RLRAG datasheet confirms this value under "MAXIMUM RATINGS" with test condition I_C = 600 mAdc.

Does the 2N4401RLRAG have Pb-free packaging?

Yes, the "G" suffix in 2N4401RLRAG explicitly denotes Pb-free packaging per onsemi's RoHS compliance program. This is confirmed in the Ordering Information table and the "Features" section of the datasheet, which states "Pb−Free Packages are Available*" and lists 2N4401RLRAG as a Pb-Free variant in TO-92 tape-and-reel format.

What is the pin configuration of the 2N4401RLRAG in TO-92 package?

The 2N4401RLRAG uses TO-92 Style 2 pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This is documented in the "MECHANICAL CASE OUTLINE" section (Page 2) of the datasheet, which specifies "STYLE 2: PIN 1. BASE 2. EMITTER 3. COLLECTOR" - matching the marking diagram and functional schematic on Page 1.

What is the typical transition frequency (f_T) of the 2N4401RLRAG?

The 2N4401RLRAG has a minimum transition frequency (f_T) of 250 MHz, measured at I_C = 20 mA, V_CE = 10 V, and f = 100 MHz. This parameter appears in the "SMALL−SIGNAL CHARACTERISTICS" table and defines the upper usable frequency for small-signal amplification and high-speed switching applications involving the 2N4401RLRAG.

How does the thermal resistance of the 2N4401RLRAG affect PCB layout?

The 2N4401RLRAG has R_JA = 200°C/W in free air, meaning each watt dissipated raises junction temperature by 200°C above ambient. To keep T_J ≤ 150°C at 25°C ambient, power must stay below 625 mW-but real-world PCBs with 1–2 cm² copper pour reduce R_JA to ~100°C/W. Layout should include thermal vias and copper flood under the emitter pad to manage heat in the 2N4401RLRAG.

2N4401RLRAG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body, Formed Leads

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

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, 1V

Power - Max:: 625 mW

Frequency - Transition:: 250MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

2N4401RLRAG FAQ

1.How can I place an order for 2N4401RLRAG through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N4401RLRAG 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 2N4401RLRAG reliable?

The price and inventory of 2N4401RLRAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N4401RLRAG is usually 5 days.

3.What payment methods are accepted for 2N4401RLRAG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N4401RLRAG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N4401RLRAG?

2N4401RLRAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N4401RLRAG 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 2N4401RLRAG?

For technical support, including 2N4401RLRAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N4401RLRAG requirements.

6.How does Aetrix verify that 2N4401RLRAG is sourced from the original manufacturer or authorized distributors?

All 2N4401RLRAG 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 2N4401RLRAG meets industry standards.

7.What is the process for return or replacement of 2N4401RLRAG?

All 2N4401RLRAG units undergo pre-shipment inspection (PSI). If there is an issue with 2N4401RLRAG, 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 2N4401RLRAG part is unused and in its original packaging.

Return procedure for 2N4401RLRAG:

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…