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

onsemi 2N4403RLG

Name: 2N4403RLG
Brand: onsemi
SKU: 2N4403RLG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N4403RLG

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2N4403RLG.pdf

Description:: TRANS PNP 40V 0.6A TO92

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Product details

Overview

2N4403RLG from onsemi is a PNP silicon general-purpose transistor in TO-92 package, rated for V_CEO = 40 V, I_C = 600 mA, and P_D = 625 mW at T_A = 25°C. It delivers h_FE = 30–300 (depending on I_C), f_T = 200 MHz, and V_CE(sat) ≤ 0.75 V at I_C = 500 mA / I_B = 50 mA - used in low-voltage switching and linear amplification circuits such as relay drivers and signal inverters.

For engineers reviewing the 2N4403RLG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal behavior, switching timing (t_d/t_r/t_s/t_f), h-parameter dependencies, and Pb-free tape-and-reel availability - all critical for discrete BJT selection in cost-sensitive industrial control and analog interface designs.

Technical Context

This PNP bipolar junction transistor operates with emitter-base forward bias and collector-base reverse bias in active or saturation mode. Its DC current gain (h_FE) varies from 30 at I_C = 500 mA to 300 at I_C = 150 mA, while small-signal current gain (h_fe) ranges 60–500 at 1 kHz. The device exhibits C_cb = 8.5 pF and C_eb = 30 pF, supporting RF-capable switching up to 200 MHz.

Thermal resistance R_JA = 200°C/W (TO-92, free-air) and R_JC = 83.3°C/W enable reliable operation across −55°C to +150°C junction temperature range. Switching performance includes t_s = 225 ns (storage time) and t_f = 30 ns (fall time) under V_CC = 30 V, I_C = 150 mA, and I_B1/I_B2 = 15 mA conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum collector-emitter voltage before breakdown; defines safe operating voltage headroom in low-side switch configurations.
I_C (max)	600 mA - Continuous collector current limit; supports relay coil driving and medium-current logic-level inversion.
h_FE @ I_C = 150 mA	100–300 - DC current gain range enabling predictable base drive sizing for saturation in switching applications.
f_T	200 MHz - Transition frequency confirming usable bandwidth for audio-frequency amplification and fast digital switching.
V_CE(sat) @ I_C/I_B = 10	≤ 0.75 V - Low saturation voltage reduces power loss and self-heating during high-duty-cycle on-state operation.
R_JA	200°C/W - Thermal resistance indicating need for heatsinking or derating above 25°C ambient for sustained 625 mW dissipation.
t_s	225 ns - Storage time limiting maximum switching frequency in saturated-switch topologies without Baker clamp.

Pinout & Package

2N4403RLG uses the industry-standard TO-92 (Case 29, Style 1) plastic package with 3 leads. Lead spacing matches JEDEC TO-226AA footprint. Device marking reads "2N4403" followed by date code; Pb-free compliant per onsemi's RoHS implementation.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit node in PNP operation; connected to higher potential rail in common-emitter switch configurations.
2	Base	Control terminal; requires negative bias relative to emitter to turn on; typical I_B = I_C/10 for saturation.
3	Collector	Current entry node; tied to load and ground-return path in low-side switching; handles full load current and voltage swing.

Key Features

Feature	Design Value
Pb-free (RoHS-compliant) packaging	2N4403RLG meets EU RoHS Directive 2011/65/EU and JESD204B; suitable for environmentally regulated industrial and consumer production.
High f_T and low C_eb	200 MHz f_T with 30 pF emitter-base capacitance enables stable small-signal amplification up to ~10 MHz without peaking.
Wide operating temperature range	−55°C to +150°C junction rating supports deployment in automotive engine compartments and industrial motor controls.
Low V_CE(sat) at high I_C	0.75 V max at I_C = 500 mA ensures <150 mW conduction loss, reducing thermal stress in compact PCB layouts.
Standard TO-92 mechanical compatibility	Interchangeable with legacy 2N4403 variants in existing through-hole footprints; no retooling required for board assembly.

Applications

Relay Driver Circuit	Level-Shifting Inverter
Use Scenario: Driving 12 V, 100 mA electromagnetic relay coil from 3.3 V or 5 V microcontroller GPIO. IC Role / Device Role / Timing Role: PNP switch configured in common-emitter mode, sinking relay current to ground when base is pulled low. Use Value: V_CEO = 40 V provides 3× margin over 12 V supply; h_FE ≥ 100 ensures <1 mA base drive suffices for full saturation.	Use Scenario: Converting TTL/CMOS logic-high (3.3 V) to inverted 0 V output while sourcing up to 50 mA to downstream gate inputs. IC Role / Device Role / Timing Role: Active-low inverter with emitter-follower or common-emitter topology, leveraging PNP polarity for natural inversion. Use Value: t_r/t_f ≤ 20/30 ns enables clean transitions at >1 MHz clock rates; low V_CE(sat) preserves noise margin.
LED Current Sink	Analog Signal Amplifier
Use Scenario: Controlling brightness of multi-color LED arrays via PWM-driven base current in constant-current sink configuration. IC Role / Device Role / Timing Role: Linear-mode current regulator where base voltage sets emitter current; collector tied to fixed V_CC. Use Value: h_FE stability across I_C = 10–150 mA allows precise current scaling; R_JA = 200°C/W permits 500 mW operation with minimal heatsink.	Use Scenario: Building low-noise preamplifier stage for sensor signals (e.g., thermistor bridge outputs) in 0.1–10 kHz band. IC Role / Device Role / Timing Role: Common-emitter amplifier biased in active region; h_fe = 60–500 at 1 kHz ensures predictable gain control. Use Value: NF < 10 dB at I_C = 1 mA / R_S = 430 Ω minimizes added noise; C_cb = 8.5 pF limits Miller effect at audio frequencies.

Relay Driver Circuit

Level-Shifting Inverter

Use Scenario: Driving 12 V, 100 mA electromagnetic relay coil from 3.3 V or 5 V microcontroller GPIO.

IC Role / Device Role / Timing Role: PNP switch configured in common-emitter mode, sinking relay current to ground when base is pulled low.

Use Value: V_CEO = 40 V provides 3× margin over 12 V supply; h_FE ≥ 100 ensures <1 mA base drive suffices for full saturation.

Use Scenario: Converting TTL/CMOS logic-high (3.3 V) to inverted 0 V output while sourcing up to 50 mA to downstream gate inputs.

IC Role / Device Role / Timing Role: Active-low inverter with emitter-follower or common-emitter topology, leveraging PNP polarity for natural inversion.

Use Value: t_r/t_f ≤ 20/30 ns enables clean transitions at >1 MHz clock rates; low V_CE(sat) preserves noise margin.

LED Current Sink

Analog Signal Amplifier

Use Scenario: Controlling brightness of multi-color LED arrays via PWM-driven base current in constant-current sink configuration.

IC Role / Device Role / Timing Role: Linear-mode current regulator where base voltage sets emitter current; collector tied to fixed V_CC.

Use Value: h_FE stability across I_C = 10–150 mA allows precise current scaling; R_JA = 200°C/W permits 500 mW operation with minimal heatsink.

Use Scenario: Building low-noise preamplifier stage for sensor signals (e.g., thermistor bridge outputs) in 0.1–10 kHz band.

IC Role / Device Role / Timing Role: Common-emitter amplifier biased in active region; h_fe = 60–500 at 1 kHz ensures predictable gain control.

Use Value: NF < 10 dB at I_C = 1 mA / R_S = 430 Ω minimizes added noise; C_cb = 8.5 pF limits Miller effect at audio frequencies.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPSA92	V_CEO = 300 V, I_C = 500 mA, h_FE = 25–300, TO-92 package	Higher voltage rating suits AC line sensing or flyback snubbers; lower I_C and higher V_CE(sat) reduce efficiency in high-current DC switching.	Select MPSA92 only when >100 V blocking capability is mandatory; otherwise 2N4403RLG offers better conduction efficiency at ≤40 V.
BC557	V_CEO = 45 V, I_C = 100 mA, h_FE = 110–800, TO-92 package	Lower I_C rating restricts use to signal-level loads; tighter h_FE spread improves gain predictability but limits drive strength.	Choose BC557 for precision bias networks or low-power amplifiers; 2N4403RLG remains preferred for >100 mA load switching.

Compared with MPSA92 and BC557, the 2N4403RLG uniquely balances 40 V/600 mA ratings, 200 MHz f_T, and Pb-free tape-and-reel packaging - making it optimal for cost-sensitive, medium-current industrial control nodes requiring proven reliability and supply continuity.

Availability

2N4403RLG is available at Aetrix Electronics and suitable for relay drivers, LED current sinks, level-shifting inverters, and analog preamplifiers requiring stable component supply across extended production lifecycles.

Supply support for 2N4403RLG 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The 2N4403RLG belongs to onsemi's legacy general-purpose bipolar transistor family, designed for robust, low-cost discrete switching and amplification in non-safety-critical industrial and consumer systems.

FAQ

What is the maximum continuous collector current rating for the 2N4403RLG?

The 2N4403RLG has a maximum continuous collector current (I_C) rating of 600 mA at T_A = 25°C. This value must be derated linearly above 25°C ambient using the specified 5.0 mW/°C thermal derating factor for free-air operation. At 75°C ambient, the usable I_C drops to approximately 350 mA to maintain safe junction temperature.

Is the 2N4403RLG pin-compatible with the standard 2N4403 through-hole variant?

Yes, the 2N4403RLG uses the identical TO-92 (Case 29, Style 1) package with pin 1 = Emitter, pin 2 = Base, pin 3 = Collector. Its lead frame, footprint, and soldering profile match legacy 2N4403 variants - enabling drop-in replacement in existing designs without layout changes.

Does the 2N4403RLG meet RoHS requirements?

Yes, the "G" suffix in 2N4403RLG explicitly denotes Pb-free (RoHS-compliant) construction per onsemi's documentation. The device complies with EU Directive 2011/65/EU and contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.

What is the typical storage time (t_s) of the 2N4403RLG under standard switching conditions?

The 2N4403RLG exhibits a maximum storage time (t_s) of 225 ns when tested at V_CC = 30 V, I_C = 150 mA, I_B1 = I_B2 = 15 mA. This parameter directly impacts maximum achievable switching frequency in saturated-mode applications and should be considered when designing without base-drive optimization techniques.

Can the 2N4403RLG be used in linear amplifier configurations?

Yes, the 2N4403RLG supports linear operation with verified h_fe = 60–500 at 1 kHz and low noise figure (<10 dB at I_C = 1 mA). Its C_eb = 30 pF and f_T = 200 MHz allow stable gain up to ~10 MHz, provided proper biasing and thermal management are implemented per the datasheet's static characteristic curves.

2N4403RLG 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:: PNP

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, 2V

Power - Max:: 625 mW

Frequency - Transition:: 200MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

2N4403RLG FAQ

1.How can I place an order for 2N4403RLG through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N4403RLG 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 2N4403RLG reliable?

The price and inventory of 2N4403RLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N4403RLG is usually 5 days.

3.What payment methods are accepted for 2N4403RLG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N4403RLG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N4403RLG?

2N4403RLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N4403RLG 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 2N4403RLG?

For technical support, including 2N4403RLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N4403RLG requirements.

6.How does Aetrix verify that 2N4403RLG is sourced from the original manufacturer or authorized distributors?

All 2N4403RLG 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 2N4403RLG meets industry standards.

7.What is the process for return or replacement of 2N4403RLG?

All 2N4403RLG units undergo pre-shipment inspection (PSI). If there is an issue with 2N4403RLG, 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 2N4403RLG part is unused and in its original packaging.

Return procedure for 2N4403RLG:

1.Submit a request within 90 days.

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

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