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

onsemi 2N4401RLRA

Name: 2N4401RLRA
Brand: onsemi
SKU: 2N4401RLRA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N4401RLRA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: -

Datasheet:: 2N4401RLRA.pdf

Description:: TRANS NPN 40V 0.6A TO92

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2N4401RLRA from onsemi is an NPN silicon general-purpose transistor 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 V_CE(sat) ≤ 0.4 V at I_C = 150 mA / I_B = 15 mA. It is widely used in low-voltage switching and linear amplification circuits such as relay drivers and signal buffering.

For engineers reviewing the 2N4401RLRA datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 package compatibility, guaranteed h_FE range at multiple bias points, saturation voltage under defined drive conditions, thermal resistance (R_JA = 200°C/W), and Pb-free tape-and-reel packaging (2000 units/reel).

Technical Context

The 2N4401RLRA operates as a standard bipolar junction transistor with fixed-emitter configuration and base-controlled current amplification. Its electrical behavior is characterized by well-defined OFF-state breakdown voltages (V_(BR)CEO = 40 V, V_(BR)CBO = 60 V, V_(BR)EBO = 6.0 V) and ON-state parameters including V_BE(sat) = 0.75–0.95 V and V_CE(sat) = 0.4–0.75 V across specified I_C/I_B conditions.

Small-signal performance includes h_fe = 40–500 at 1 mA, input impedance (h_ie) = 1.0–15 kΩ, and output admittance (h_oe) = 1.0–30 mhos at 1 kHz. Switching metrics-td ≤ 15 ns, tr ≤ 20 ns, ts ≤ 225 ns, tf ≤ 30 ns-are specified under standardized test conditions (V_CC = 30 V, I_C/I_B = 10) for digital switching applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum allowable collector-to-emitter voltage before breakdown in common-emitter configuration.
I_C (continuous)	600 mA - Continuous collector current limit defining safe linear/switching operation without thermal runaway.
P_D @ T_A = 25°C	625 mW - Maximum power dissipation at room ambient; derates 5.0 mW/°C above 25°C.
h_FE @ I_C = 150 mA	100–300 - Confirmed DC current gain range enabling predictable base drive sizing for switching loads.
f_T	250 MHz - Transition frequency indicating usable bandwidth for RF amplification up to ~100 MHz.
V_CE(sat) @ I_C/I_B = 10	≤ 0.4 V - Low saturation voltage ensures minimal power loss and heat generation in saturated switch mode.
R_JA	200°C/W - Junction-to-ambient thermal resistance determines required PCB copper area or heatsinking for thermal management.

Pinout & Package

2N4401RLRA uses the TO-92 (Case 29-11, Style 1) plastic package with bent leads and Pb-free finish. Dimensions conform to ANSI Y14.5M standards: body height 4.45–5.20 mm, lead spacing 2.54 mm, and maximum outline diameter 4.32–5.33 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal in NPN configuration	Reference node for base-emitter junction; connects to ground or low-side return path in common-emitter circuits.
2 (Base)	Control input for minority-carrier injection	Receives forward-biased current to modulate collector current; requires series resistor to limit I_B per h_FE target.
3 (Collector)	Current source terminal in NPN configuration	Connects to load and supply rail; carries amplified I_C = h_FE × I_B; must withstand V_CEO during off-state.

Key Features

Feature	Design Value
Pb-free tape-and-reel packaging	2000 units/reel with orientation compliance per BRD8011/D; supports automated SMT placement despite through-hole TO-92 form factor.
Guaranteed h_FE range across bias points	Min 20 @ I_C = 0.1 mA, min 100 @ I_C = 150 mA - Enables robust design margin for both small-signal and medium-power switching.
Low V_CE(sat) at high I_C	≤ 0.4 V @ I_C = 150 mA / I_B = 15 mA - Reduces conduction loss and self-heating in relay driver and LED switch applications.
High f_T and low capacitance	f_T = 250 MHz; C_cb ≤ 6.5 pF, C_eb ≤ 30 pF - Supports stable amplification and fast edge rates in audio and pulse circuits.
Wide operating temperature range	−55°C to +150°C junction temperature - Suitable for industrial control, automotive under-hood, and outdoor equipment environments.

Applications

Relay Driver Circuit	DC Motor Speed Control
Use Scenario: Driving 12 V, 200 mA electromagnetic relay coil from microcontroller GPIO. IC Role / Device Role / Timing Role: NPN switch configured in common-emitter topology with base resistor and flyback diode. Use Value: V_CE(sat) ≤ 0.4 V minimizes coil voltage drop; h_FE ≥ 100 ensures <1.5 mA base drive suffices for full saturation.	Use Scenario: PWM-based speed regulation of 6–24 V brushed DC motor in portable instrumentation. IC Role / Device Role / Timing Role: Low-side switch controlling motor current path with 1–20 kHz PWM input. Use Value: ts ≤ 225 ns and tf ≤ 30 ns support clean PWM edges; R_JA = 200°C/W allows operation without heatsink at ≤500 mW average dissipation.
Audio Pre-amplifier Stage	Logic-Level Signal Buffer
Use Scenario: Single-stage voltage amplifier for electret microphone output (10–100 mV, 1–10 kHz). IC Role / Device Role / Timing Role: Common-emitter amplifier biased at I_C = 1 mA with emitter degeneration and collector load. Use Value: h_fe = 40–500 and noise figure <6 dB at 1 kHz enable SNR >65 dB; f_T = 250 MHz avoids bandwidth limitation.	Use Scenario: Level-shifting and current boosting between 3.3 V MCU outputs and 5 V TTL logic inputs. IC Role / Device Role / Timing Role: Emitter-follower buffer providing high input impedance and low output impedance. Use Value: V_BE(sat) = 0.75–0.95 V ensures reliable turn-on from 3.3 V logic; C_eb ≤ 30 pF preserves rise/fall times <20 ns.

Relay Driver Circuit

DC Motor Speed Control

Use Scenario: Driving 12 V, 200 mA electromagnetic relay coil from microcontroller GPIO.

IC Role / Device Role / Timing Role: NPN switch configured in common-emitter topology with base resistor and flyback diode.

Use Value: V_CE(sat) ≤ 0.4 V minimizes coil voltage drop; h_FE ≥ 100 ensures <1.5 mA base drive suffices for full saturation.

Use Scenario: PWM-based speed regulation of 6–24 V brushed DC motor in portable instrumentation.

IC Role / Device Role / Timing Role: Low-side switch controlling motor current path with 1–20 kHz PWM input.

Use Value: ts ≤ 225 ns and tf ≤ 30 ns support clean PWM edges; R_JA = 200°C/W allows operation without heatsink at ≤500 mW average dissipation.

Audio Pre-amplifier Stage

Logic-Level Signal Buffer

Use Scenario: Single-stage voltage amplifier for electret microphone output (10–100 mV, 1–10 kHz).

IC Role / Device Role / Timing Role: Common-emitter amplifier biased at I_C = 1 mA with emitter degeneration and collector load.

Use Value: h_fe = 40–500 and noise figure <6 dB at 1 kHz enable SNR >65 dB; f_T = 250 MHz avoids bandwidth limitation.

Use Scenario: Level-shifting and current boosting between 3.3 V MCU outputs and 5 V TTL logic inputs.

IC Role / Device Role / Timing Role: Emitter-follower buffer providing high input impedance and low output impedance.

Use Value: V_BE(sat) = 0.75–0.95 V ensures reliable turn-on from 3.3 V logic; C_eb ≤ 30 pF preserves rise/fall times <20 ns.

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
2N4403	PNP complement with identical V_CEO, I_C, P_D, and package; h_FE min 20–300 but inverted polarity.	Used in complementary push-pull stages or high-side switching where current sourcing is required.	Select 2N4403 only when circuit topology demands PNP operation; not a drop-in replacement for 2N4401RLRA.
MPS2222A	Higher h_FE (min 100 @ I_C = 150 mA), lower V_CE(sat) (0.3 V), same TO-92 package and pinout (E-B-C).	Preferred in low-loss switching where tighter h_FE tolerance and reduced saturation voltage improve efficiency.	MPS2222A offers improved gain consistency and lower conduction loss but requires verification of layout compatibility due to different internal structure.

Compared with 2N4401RLRA, the 2N4403 serves complementary roles in dual-transistor topologies, while the MPS2222A provides higher minimum h_FE and lower V_CE(sat) for enhanced switching efficiency-both require functional validation in the target circuit rather than blind substitution.

Availability

2N4401RLRA is available at Aetrix Electronics and suitable for relay driver circuits, DC motor control modules, audio pre-amplifiers, and logic-level signal buffering requiring stable component supply and Pb-free compliance.

Supply support for 2N4401RLRA 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 management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The 2N4401RLRA belongs to onsemi's legacy general-purpose bipolar transistor product line, designed for cost-sensitive, high-volume applications requiring proven reliability, wide temperature operation, and compatibility with standard through-hole assembly processes.

FAQ

What is the maximum collector current rating for the 2N4401RLRA?

The 2N4401RLRA has a maximum continuous collector current (I_C) rating of 600 mA at T_A = 25°C. This rating assumes adequate PCB copper area for heat dissipation; derating applies above 25°C ambient (−5.0 mW/°C). Pulse current capability exceeds this value under defined duty cycle and pulse width limits per the datasheet.

Does the 2N4401RLRA have Pb-free construction?

Yes, the 2N4401RLRA is a Pb-free device compliant with RoHS directives. The "RLRA" suffix explicitly denotes Pb-free tape-and-reel packaging (2000 units/reel), confirmed in the official onsemi ordering information table and referenced in the Pb-Free Packages note on page 1 of the datasheet.

What is the pin configuration of the 2N4401RLRA in the TO-92 package?

The 2N4401RLRA uses TO-92 Style 1 pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This is documented in the "MECHANICAL CASE OUTLINE" section (page 2) of the datasheet and verified against the marking diagram and lead configuration illustrations.

Can the 2N4401RLRA be used in audio amplifier applications?

Yes, the 2N4401RLRA is suitable for low-noise audio pre-amplifier stages. Its small-signal characteristics-including h_fe = 40–500, input impedance h_ie = 1.0–15 kΩ, and noise figure <6 dB at 1 kHz-support high-fidelity signal amplification with minimal distortion when properly biased at I_C = 0.1–1.0 mA.

How does the 2N4401RLRA compare to the 2N2222A in switching performance?

The 2N4401RLRA offers comparable V_CEO (40 V vs. 40 V) and I_C (600 mA vs. 800 mA) to the 2N2222A but with slightly higher V_CE(sat) (0.4 V vs. 0.3 V) and lower f_T (250 MHz vs. 300 MHz). Both use TO-92 packages, but pinouts differ: 2N4401RLRA is E-B-C, while 2N2222A is E-B-C in most variants-always verify mechanical drawing before substitution.

2N4401RLRA Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: *

Package/Case:: -

Packaging:: Cut Tape (CT)

Product Status:: Obsolete

Transistor Type:: -

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

Voltage - Collector Emitter Breakdown (Max):: -

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: -

Power - Max:: -

Frequency - Transition:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

2N4401RLRA FAQ

1.How can I place an order for 2N4401RLRA through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N4401RLRA 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 2N4401RLRA reliable?

The price and inventory of 2N4401RLRA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N4401RLRA is usually 5 days.

3.What payment methods are accepted for 2N4401RLRA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N4401RLRA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N4401RLRA?

2N4401RLRA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N4401RLRA 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 2N4401RLRA?

For technical support, including 2N4401RLRA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N4401RLRA requirements.

6.How does Aetrix verify that 2N4401RLRA is sourced from the original manufacturer or authorized distributors?

All 2N4401RLRA 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 2N4401RLRA meets industry standards.

7.What is the process for return or replacement of 2N4401RLRA?

All 2N4401RLRA units undergo pre-shipment inspection (PSI). If there is an issue with 2N4401RLRA, 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 2N4401RLRA part is unused and in its original packaging.

Return procedure for 2N4401RLRA:

1.Submit a request within 90 days.

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

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