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

onsemi 2N4403RLRP

Name: 2N4403RLRP
Brand: onsemi
SKU: 2N4403RLRP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N4403RLRP

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2N4403RLRP.pdf

Description:: TRANS PNP 40V 0.6A TO92

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2N4403RLRP 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, used in low-voltage switching and linear amplification circuits such as power supply control and signal inversion.

For engineers reviewing the 2N4403RLRP datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal behavior, switching timing (t_d/t_r/t_s/t_f), package dimensions, and direct alternatives for discrete BJT selection in industrial and consumer electronics design.

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 spans 30 to 300 across I_C = 0.1–500 mA, supporting both analog amplification and digital switching functions. The device exhibits C_cb = 8.5 pF and C_eb = 30 pF at specified test conditions, enabling stable performance up to 200 MHz.

Thermal resistance R_JA = 200°C/W and R_JC = 83.3°C/W define its heat dissipation capability in ambient- or case-cooled configurations. Switching characteristics include 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 - critical for pulse-width modulation and relay driver designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage before breakdown; sets upper rail limit in low-side switch or amplifier stages.
I_C (max)	600 mA - Continuous collector current rating; determines load-driving capacity in relay, LED, or fan control circuits.
h_FE range	30–300 - Gain variation across operating current; requires bias network margining for consistent amplification or switching threshold.
f_T	200 MHz - Transition frequency; supports RF preamp or high-speed logic interface applications up to ~20 MHz usable bandwidth.
V_CE(sat)	≤0.75 V @ I_C=500 mA - Low saturation voltage minimizes conduction loss and self-heating in power-switching roles.
R_JA	200°C/W - Junction-to-ambient thermal resistance; implies ~125°C rise at full 625 mW dissipation in still air without heatsink.
t_s	225 ns - Storage time under defined switching conditions; dominates turn-off delay in saturated switching applications.

Pinout & Package

2N4403RLRP uses the industry-standard TO-92 (Case 29, Style 1) through-hole plastic package with 3 leads. Pin 1 is Emitter, Pin 2 is Base, Pin 3 is Collector - confirmed by marking diagram and ordering information in the official datasheet.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path in PNP operation	Connected to higher potential (e.g., V_CC) in common-emitter switches; sets reference for base bias network.
2 (Base)	Control terminal for minority-carrier injection	Requires current-limited drive (e.g., via resistor from microcontroller GPIO); base-emitter voltage drop is ~0.75–0.95 V in saturation.
3 (Collector)	Current entry path in PNP operation	Typically tied to load and ground return; collector-emitter voltage swing must stay within 40 V rating during transients.

Key Features

Feature	Design Value
Pb-Free packaging option	2N4403RLRP is RoHS-compliant and compatible with lead-free reflow profiles per J-STD-020.
High f_T / low capacitance	200 MHz f_T with C_cb = 8.5 pF and C_eb = 30 pF enables stable small-signal amplification above 10 MHz.
Wide h_FE range	30–300 gain spread allows use in both precision biasing (low I_C) and robust switching (high I_C) with same part number.
Low V_CE(sat)	0.4 V min / 0.75 V max ensures <150 mW conduction loss at 500 mA - critical for thermally constrained PCB layouts.
Extended temperature range	−55°C to +150°C operating junction range supports deployment in automotive under-hood and industrial motor-control environments.

Applications

LED Driver Circuit	Relay Control Interface
Use Scenario: Driving high-brightness LEDs from 5–12 V rails in signage or indicator panels. IC Role / Device Role / Timing Role: PNP switch configured in common-emitter topology, sinking current from LED anode to ground via collector. Use Value: V_CE(sat) ≤ 0.75 V at 500 mA limits power loss to <375 mW, reducing thermal stress on compact PCBs.	Use Scenario: Controlling 12 V/24 V electromagnetic relays using microcontroller GPIO pins. IC Role / Device Role / Timing Role: Saturated PNP switch isolating logic-level signals from inductive coil loads. Use Value: t_s = 225 ns and t_f = 30 ns enable reliable 1–5 kHz PWM operation without contact bounce or coil remnant magnetism.
Linear Voltage Regulator Pass Element	Audio Signal Inverter Stage
Use Scenario: Acting as series pass transistor in adjustable 3-terminal regulators delivering up to 600 mA. IC Role / Device Role / Timing Role: Operated in active region with feedback-controlled base current to regulate output voltage. Use Value: h_FE ≥ 100 at I_C = 10 mA ensures stable loop gain and low dropout under light load conditions.	Use Scenario: Inverting audio-frequency signals (20 Hz–20 kHz) in preamplifier or tone-control circuits. IC Role / Device Role / Timing Role: Common-emitter amplifier with emitter degeneration resistor for linearity and gain control. Use Value: f_T = 200 MHz and h_fe = 60–500 at 1 kHz support flat frequency response and low distortion up to 100 kHz.

LED Driver Circuit

Relay Control Interface

Use Scenario: Driving high-brightness LEDs from 5–12 V rails in signage or indicator panels.

IC Role / Device Role / Timing Role: PNP switch configured in common-emitter topology, sinking current from LED anode to ground via collector.

Use Value: V_CE(sat) ≤ 0.75 V at 500 mA limits power loss to <375 mW, reducing thermal stress on compact PCBs.

Use Scenario: Controlling 12 V/24 V electromagnetic relays using microcontroller GPIO pins.

IC Role / Device Role / Timing Role: Saturated PNP switch isolating logic-level signals from inductive coil loads.

Use Value: t_s = 225 ns and t_f = 30 ns enable reliable 1–5 kHz PWM operation without contact bounce or coil remnant magnetism.

Linear Voltage Regulator Pass Element

Audio Signal Inverter Stage

Use Scenario: Acting as series pass transistor in adjustable 3-terminal regulators delivering up to 600 mA.

IC Role / Device Role / Timing Role: Operated in active region with feedback-controlled base current to regulate output voltage.

Use Value: h_FE ≥ 100 at I_C = 10 mA ensures stable loop gain and low dropout under light load conditions.

Use Scenario: Inverting audio-frequency signals (20 Hz–20 kHz) in preamplifier or tone-control circuits.

IC Role / Device Role / Timing Role: Common-emitter amplifier with emitter degeneration resistor for linearity and gain control.

Use Value: f_T = 200 MHz and h_fe = 60–500 at 1 kHz support flat frequency response and low distortion up to 100 kHz.

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 but lower current and slightly slower switching (t_s ≈ 300 ns)	Select when >40 V collector swing is required; verify layout clearance for 300 V standoff.
BC557	V_CEO = 45 V, I_C = 100 mA, h_FE = 110–800, TO-92 package	Lower current rating and higher gain spread; not suitable for >100 mA loads	Prefer for low-power signal inversion where gain consistency matters more than drive strength.

Compared with MPSA92 and BC557, the 2N4403RLRP offers optimal balance of 40 V/600 mA rating, 200 MHz f_T, and proven thermal performance in TO-92 - making it ideal for cost-sensitive, medium-current switching where voltage headroom is limited to ≤40 V.

Availability

2N4403RLRP is available at Aetrix Electronics and suitable for LED driver circuits, relay interfaces, linear regulator pass elements, and audio signal inversion requiring stable component supply and long-term industrial availability.

Supply support for 2N4403RLRP 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 electronics, delivering discrete, analog, power management, and sensor solutions.

The 2N4403RLRP belongs to onsemi's legacy general-purpose bipolar transistor product line, designed for cost-effective, reliable switching and amplification in consumer, industrial, and automotive auxiliary systems.

FAQ

What is the maximum continuous collector current for the 2N4403RLRP?

The 2N4403RLRP has a maximum continuous collector current (I_C) rating of 600 mA at T_A = 25°C. Derating applies above 25°C at 5.0 mW/°C for ambient operation. This rating defines its safe operating area in switching and linear applications - exceeding it risks thermal runaway or permanent degradation of the 2N4403RLRP junction.

Does the 2N4403RLRP have Pb-free packaging?

Yes, the 2N4403RLRP is offered in a Pb-free (RoHS-compliant) TO-92 package. The "G" suffix denotes Pb-free variants (e.g., 2N4403RLRG), but the 2N4403RLRP itself is also Pb-free per onsemi's standard manufacturing policy effective since 2005, as confirmed in the datasheet revision notes and ordering table.

What is the typical DC current gain (h_FE) of the 2N4403RLRP at 10 mA collector current?

At I_C = 10 mA and V_CE = 1.0 V, the 2N4403RLRP exhibits h_FE = 100 (minimum) to 300 (maximum). This wide gain range reflects process variation and requires circuit-level tolerance - for example, bias networks should accommodate ≥3× h_FE spread to ensure consistent 2N4403RLRP saturation or active-mode operation.

Can the 2N4403RLRP be used in high-frequency amplifier designs?

Yes - the 2N4403RLRP has an f_T of 200 MHz and low parasitic capacitances (C_cb = 8.5 pF, C_eb = 30 pF), supporting stable small-signal amplification up to ~20 MHz. For RF applications, proper impedance matching and layout isolation are essential; the 2N4403RLRP is not optimized for >100 MHz narrowband gain but performs well in broadband preamp and IF stages.

What is the thermal resistance junction-to-ambient (R_JA) for the 2N4403RLRP in free-air conditions?

The 2N4403RLRP has R_JA = 200°C/W in free-air (no heatsink) per the datasheet's thermal characteristics table. This means a 625 mW power dissipation causes a ~125°C junction-to-ambient temperature rise - confirming that sustained full-power operation requires careful thermal design or derating to maintain reliability of the 2N4403RLRP.

2N4403RLRP Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

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)

2N4403RLRP FAQ

1.How can I place an order for 2N4403RLRP through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N4403RLRP 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 2N4403RLRP reliable?

The price and inventory of 2N4403RLRP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N4403RLRP is usually 5 days.

3.What payment methods are accepted for 2N4403RLRP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N4403RLRP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N4403RLRP?

2N4403RLRP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N4403RLRP 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 2N4403RLRP?

For technical support, including 2N4403RLRP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N4403RLRP requirements.

6.How does Aetrix verify that 2N4403RLRP is sourced from the original manufacturer or authorized distributors?

All 2N4403RLRP 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 2N4403RLRP meets industry standards.

7.What is the process for return or replacement of 2N4403RLRP?

All 2N4403RLRP units undergo pre-shipment inspection (PSI). If there is an issue with 2N4403RLRP, 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 2N4403RLRP part is unused and in its original packaging.

Return procedure for 2N4403RLRP:

1.Submit a request within 90 days.

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

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