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

onsemi 2N4401RLRMG

Name: 2N4401RLRMG
Brand: onsemi
SKU: 2N4401RLRMG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N4401RLRMG

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2N4401RLRMG.pdf

Description:: TRANS NPN 40V 0.6A TO92

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2N4401RLRMG 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 2N4401RLRMG datasheet, pinout, applications, or equivalent options, key selection criteria include its Pb-free TO-92 packaging, 225 ns storage time, 0.4 V typical V_CE(sat) at 150 mA/15 mA drive, and compatibility with through-hole prototyping and industrial control input stages.

Technical Context

The 2N4401RLRMG operates as a standard bipolar junction transistor with fixed-emitter configuration and base-controlled current amplification. Its electrical behavior is defined by h-parameter sets (h_FE, h_ie, h_oe, h_re) measured at V_CE = 10 V and f = 1 kHz, and small-signal characteristics including f_T = 250 MHz and C_cb ≤ 6.5 pF.

Switching performance is characterized under pulsed conditions (pulse width ≤ 300 µs, duty cycle ≤ 2.0%), with specified delay (t_d ≤ 15 ns), rise (t_r ≤ 20 ns), storage (t_s ≤ 225 ns), and fall (t_f ≤ 30 ns) times at V_CC = 30 V and I_C/I_B = 10. Thermal resistance R_JA = 200 °C/W confirms suitability for natural-convection PCB mounting.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage before breakdown; defines rail limit in low-side switch designs.
I_C (continuous)	600 mA - Sustained load current capability; supports relay coils and medium-current digital logic interfaces.
P_D @ T_A = 25°C	625 mW - Power handling at room ambient; derates 5 mW/°C above 25°C for thermal design margin.
h_FE range	20–300 - Wide DC current gain spread; requires design tolerance for base drive in production circuits.
f_T	250 MHz - Unity-gain bandwidth; enables audio-frequency amplification and fast digital switching up to ~20 MHz.
V_CE(sat)	0.4 V (typ.) @ I_C = 150 mA, I_B = 15 mA - Low saturation voltage reduces conduction loss in switching applications.
R_JA	200 °C/W - Junction-to-ambient thermal resistance; determines temperature rise under given power dissipation.

Pinout & Package

2N4401RLRMG uses the TO-92 (Case 29-11) plastic package with straight leads and Pb-free finish, optimized for manual assembly and wave soldering. Dimensions comply with ANSI Y14.5M and ASME Y14.5M standards; body height 4.45–5.20 mm, lead pitch 2.54 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for majority carriers	Connected to ground or low-impedance return; base-emitter junction forward-biased during turn-on.
2 (Base)	Control electrode for minority carrier injection	Receives current-limited drive signal; requires series resistor to limit I_B and ensure saturation.
3 (Collector)	Current entry path for majority carriers	Connected to load and supply rail; handles full switched current and must be routed for thermal relief.

Key Features

Feature	Design Value
Pb-free TO-92 packaging	Complies with RoHS Directive 2011/65/EU; compatible with lead-free reflow and wave soldering processes.
High f_T (250 MHz)	Supports broadband amplification and high-speed switching without external compensation.
Low V_CE(sat) (0.4 V typ.)	Minimizes power loss and self-heating in saturated-switch operation at moderate currents.
Wide h_FE range (20–300)	Enables flexible biasing schemes but requires worst-case analysis for reliable saturation across batches.
Specified switching times	Defined t_s ≤ 225 ns and t_f ≤ 30 ns support clean digital edge transitions in 1–5 MHz logic interface circuits.

Applications

LED Driver Circuit	Microcontroller GPIO Expander
Use Scenario: Driving 20–100 mA indicator LEDs from 3.3 V or 5 V microcontroller outputs. IC Role / Device Role / Timing Role: Low-side switch controlled by MCU GPIO; operates in saturation region with fixed base resistor. Use Value: 0.4 V V_CE(sat) ensures >95% LED forward voltage utilization; TO-92 footprint simplifies hand-soldered prototypes.	Use Scenario: Amplifying weak sensor signals (e.g., thermistor, photodiode) into MCU ADC inputs. IC Role / Device Role / Timing Role: Common-emitter amplifier stage with emitter degeneration; biased for linear operation at I_C ≈ 1 mA. Use Value: h_FE ≥ 40 at 1 mA enables stable gain of 100+ with minimal component count; f_T supports audio-band fidelity.
Relay Control Interface	Signal Level Translation
Use Scenario: Switching 12 V/50 mA electromechanical relays using 3.3 V logic-level signals. IC Role / Device Role / Timing Role: Darlington-compatible driver stage; base driven via current-limiting resistor from MCU output. Use Value: 600 mA I_C rating exceeds relay coil requirements; 225 ns storage time prevents contact chatter during rapid toggling.	Use Scenario: Converting 1.8 V logic signals to 5 V TTL levels for legacy peripheral interfacing. IC Role / Device Role / Timing Role: Common-emitter level shifter with pull-up resistor on collector; configured for fast edge response. Use Value: 20 ns rise time and 30 ns fall time preserve signal integrity at 10 Mbps data rates; low C_cb (≤6.5 pF) minimizes capacitive loading.

LED Driver Circuit

Microcontroller GPIO Expander

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

IC Role / Device Role / Timing Role: Low-side switch controlled by MCU GPIO; operates in saturation region with fixed base resistor.

Use Value: 0.4 V V_CE(sat) ensures >95% LED forward voltage utilization; TO-92 footprint simplifies hand-soldered prototypes.

Use Scenario: Amplifying weak sensor signals (e.g., thermistor, photodiode) into MCU ADC inputs.

IC Role / Device Role / Timing Role: Common-emitter amplifier stage with emitter degeneration; biased for linear operation at I_C ≈ 1 mA.

Use Value: h_FE ≥ 40 at 1 mA enables stable gain of 100+ with minimal component count; f_T supports audio-band fidelity.

Relay Control Interface

Signal Level Translation

Use Scenario: Switching 12 V/50 mA electromechanical relays using 3.3 V logic-level signals.

IC Role / Device Role / Timing Role: Darlington-compatible driver stage; base driven via current-limiting resistor from MCU output.

Use Value: 600 mA I_C rating exceeds relay coil requirements; 225 ns storage time prevents contact chatter during rapid toggling.

Use Scenario: Converting 1.8 V logic signals to 5 V TTL levels for legacy peripheral interfacing.

IC Role / Device Role / Timing Role: Common-emitter level shifter with pull-up resistor on collector; configured for fast edge response.

Use Value: 20 ns rise time and 30 ns fall time preserve signal integrity at 10 Mbps data rates; low C_cb (≤6.5 pF) minimizes capacitive loading.

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
2N2222A	Higher V_CEO (60 V), lower f_T (250–300 MHz typical but less consistent), same TO-92 package.	Preferred where higher voltage margin is needed; slightly slower switching due to higher C_eb (≈50 pF vs. 30 pF).	Select 2N2222A when operating near 40–60 V rails; verify h_FE distribution matches circuit bias stability needs.
BC547B	Lower I_C (100 mA), smaller h_FE range (200–450), same Pb-free TO-92, but rated only to 45 V_CEO.	Better suited for low-power signal amplification than switching; not recommended for >100 mA loads.	Choose BC547B for battery-powered analog front-ends; avoid for relay or LED driver use requiring >100 mA I_C.

Compared with 2N4401RLRMG, the 2N2222A offers greater voltage headroom but similar switching speed, while the BC547B trades current capacity for tighter h_FE tolerance-making the 2N4401RLRMG optimal for cost-sensitive, medium-current switching where 40 V and 600 mA ratings are fully utilized.

Availability

2N4401RLRMG is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, relay control interfaces, and signal level translation requiring stable component supply and RoHS-compliant packaging.

Supply support for 2N4401RLRMG 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 2N4401RLRMG belongs to onsemi's legacy general-purpose transistor product line, designed for broad utility in discrete amplification and switching functions across consumer, industrial, and educational electronics.

FAQ

What is the maximum continuous collector current rating for the 2N4401RLRMG?

The 2N4401RLRMG has a maximum continuous collector current (I_C) rating of 600 mA at T_A = 25°C. This rating decreases with rising ambient temperature due to its 5.0 mW/°C power derating factor. For reliable long-term operation, design should maintain junction temperature below +150°C using appropriate PCB copper area or heatsinking.

Does the 2N4401RLRMG have Pb-free construction?

Yes, the 2N4401RLRMG is explicitly marked as a Pb-free device in the ordering information and marking diagram. Its TO-92 package complies with RoHS Directive 2011/65/EU, and the "G" suffix in the part number (2N4401RLRMG) denotes Pb-free finish per onsemi documentation.

What is the typical V_CE(sat) for the 2N4401RLRMG under standard switching conditions?

The typical collector-emitter saturation voltage (V_CE(sat)) for the 2N4401RLRMG is 0.4 V when I_C = 150 mA and I_B = 15 mA. At higher currents (I_C = 500 mA, I_B = 50 mA), V_CE(sat) rises to 0.75 V max. These values define conduction losses in saturated-switch applications like LED or relay driving.

How does the 2N4401RLRMG compare to the 2N4401RLRA in terms of packaging and shipping format?

The 2N4401RLRMG is supplied in tape-and-ammo box packaging (2000 units per box), whereas the 2N4401RLRA uses tape-and-reel (2000 units per reel). Both share identical TO-92 Pb-free construction and electrical specifications; the difference lies solely in packaging method for automated assembly (reel) versus manual or semi-automated insertion (ammo box).

What is the thermal resistance junction-to-ambient (R_JA) for the 2N4401RLRMG?

The thermal resistance junction-to-ambient (R_JA) for the 2N4401RLRMG is 200 °C/W under standard test conditions (free-air, no heatsink). This value assumes minimal PCB copper; actual R_JA improves significantly with added copper pour or thermal vias, enabling higher sustained power dissipation in real-world layouts.

2N4401RLRMG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Box (TB)

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)

2N4401RLRMG FAQ

1.How can I place an order for 2N4401RLRMG through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N4401RLRMG 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 2N4401RLRMG reliable?

The price and inventory of 2N4401RLRMG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N4401RLRMG is usually 5 days.

3.What payment methods are accepted for 2N4401RLRMG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N4401RLRMG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N4401RLRMG?

2N4401RLRMG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N4401RLRMG 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 2N4401RLRMG?

For technical support, including 2N4401RLRMG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N4401RLRMG requirements.

6.How does Aetrix verify that 2N4401RLRMG is sourced from the original manufacturer or authorized distributors?

All 2N4401RLRMG 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 2N4401RLRMG meets industry standards.

7.What is the process for return or replacement of 2N4401RLRMG?

All 2N4401RLRMG units undergo pre-shipment inspection (PSI). If there is an issue with 2N4401RLRMG, 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 2N4401RLRMG part is unused and in its original packaging.

Return procedure for 2N4401RLRMG:

1.Submit a request within 90 days.

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

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