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

onsemi PN2484

Name: PN2484
Brand: onsemi
SKU: PN2484
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PN2484

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: PN2484.pdf

Description:: TRANS NPN 60V 0.1A TO-92-3

Quantity:: RFQ Add To RFQ list

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Inventory:6,664

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Product details

Overview

PN2484 from Fairchild Semiconductor is an NPN general-purpose amplifier transistor optimized for low-noise, high-gain operation at collector currents from 1 µA to 50 mA. It features V_CEO = 60 V, V_CBO = 60 V, I_C = 100 mA continuous, h_FE up to 800 at I_C = 10 mA, and NF = 3.0 dB at 1 kHz - used in audio preamplifier stages and sensor signal conditioning circuits.

For engineers reviewing the PN2484 datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 package compatibility, thermal resistance (R_θJA = 200 °C/W on FR-4), noise performance at microamp bias, and junction temperature range of –55°C to +150°C.

Technical Context

The PN2484 is fabricated using Fairchild's Process 07 and shares electrical characteristics with the 2N5088 family. Its design targets stable DC current gain across a wide collector current range (1 µA–10 mA), with verified h_FE ≥ 100 at I_C = 10 µA and ≥ 500 at I_C = 500 µA.

It exhibits low output capacitance (C_obo = 6.0 pF) and input capacitance (C_ibo = 6.0 pF) at 140 kHz, supporting stable small-signal amplification in bandwidth-critical analog front-ends. Saturation voltage is specified at V_CE(sat) = 0.35 V (I_C = 1 mA, I_B = 0.1 mA), confirming suitability for linear switching and active-load configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - supports rail-to-rail operation in 48 V and lower analog supply systems without breakdown risk
h_FE (min)	30 at I_C = 1 µA - ensures usable gain in ultra-low-power micropower amplifier designs
Noise Figure	3.0 dB at 1 kHz - enables high-fidelity audio and precision sensor signal amplification
P_D (T_A = 25°C)	625 mW - allows moderate power dissipation in through-hole PCB layouts without heatsinking
R_θJA	200 °C/W - defines thermal rise under standard FR-4 mounting; derates 5.0 mW/°C above 25°C
C_obo	6.0 pF at V_CB = 5 V - limits Miller effect in high-frequency common-emitter stages

Pinout & Package

PN2484 is supplied in the TO-92 plastic package (FS PKG Code 92), with lead configuration C-B-E (Collector-Base-Emitter) when viewed from the flat side with leads down and flat facing outward. Marking "1U" identifies the device on the package body.

Pin/Terminal	Circuit Role	Design Meaning
Collector (C)	Main current sink node	Connected to load or next stage input; rated for 60 V and 100 mA continuous
Base (B)	Control terminal for current amplification	Requires ~0.6 V forward bias; drives I_C = h_FE × I_B with low input impedance
Emitter (E)	Current source reference node	Typically grounded or connected to emitter resistor; supports V_EBO = 5.0 V maximum reverse bias

Key Features

Feature	Design Value
Low-noise amplification	NF = 3.0 dB at 1 kHz enables clean signal recovery in microphone and thermocouple interfaces
Wide h_FE range	h_FE = 30–800 across I_C = 1 µA–10 mA supports both micropower and medium-current bias points
High-voltage tolerance	V_CEO/V_CBO = 60 V permits use in industrial 24–48 V signal chains without level-shifting
Robust thermal rating	T_J = –55°C to +150°C enables deployment in automotive engine control and outdoor instrumentation

Applications

Audio Preamp Stage	Sensor Signal Conditioning
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric transducers before ADC sampling. IC Role / Device Role / Timing Role: NPN small-signal amplifier configured in common-emitter topology with emitter degeneration. Use Value: 3.0 dB noise figure and h_FE ≥ 200 at 100 µA ensure high SNR and stable gain without external bias compensation.	Use Scenario: Boosting low-level outputs from RTDs, thermistors, or bridge-based pressure sensors. IC Role / Device Role / Timing Role: Linear transconductance amplifier in a discrete instrumentation amplifier front-end. Use Value: Low V_CE(sat) (0.35 V) and tight h_FE distribution reduce offset drift and improve measurement linearity.
Industrial Analog Interface	Legacy Circuit Replacement
Use Scenario: Level-shifting and buffering 4–20 mA loop receiver outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Emitter-follower buffer with V_CEO = 60 V handling transient overvoltage events. Use Value: 150°C max junction temperature and R_θJA = 200 °C/W support reliable operation in uncooled DIN-rail enclosures.	Use Scenario: Drop-in replacement for obsolete 2N5088 or BC547 in legacy repair and BOM continuity programs. IC Role / Device Role / Timing Role: Direct functional substitute in fixed-gain amplifier and switch applications. Use Value: Identical TO-92 footprint, matching pinout (C-B-E), and overlapping h_FE/V_CEO/NF specs enable zero-layout change reuse.

Audio Preamp Stage

Sensor Signal Conditioning

Use Scenario: Amplifying weak signals from electret microphones or piezoelectric transducers before ADC sampling.

IC Role / Device Role / Timing Role: NPN small-signal amplifier configured in common-emitter topology with emitter degeneration.

Use Value: 3.0 dB noise figure and h_FE ≥ 200 at 100 µA ensure high SNR and stable gain without external bias compensation.

Use Scenario: Boosting low-level outputs from RTDs, thermistors, or bridge-based pressure sensors.

IC Role / Device Role / Timing Role: Linear transconductance amplifier in a discrete instrumentation amplifier front-end.

Use Value: Low V_CE(sat) (0.35 V) and tight h_FE distribution reduce offset drift and improve measurement linearity.

Industrial Analog Interface

Legacy Circuit Replacement

Use Scenario: Level-shifting and buffering 4–20 mA loop receiver outputs in PLC analog input modules.

IC Role / Device Role / Timing Role: Emitter-follower buffer with V_CEO = 60 V handling transient overvoltage events.

Use Value: 150°C max junction temperature and R_θJA = 200 °C/W support reliable operation in uncooled DIN-rail enclosures.

Use Scenario: Drop-in replacement for obsolete 2N5088 or BC547 in legacy repair and BOM continuity programs.

IC Role / Device Role / Timing Role: Direct functional substitute in fixed-gain amplifier and switch applications.

Use Value: Identical TO-92 footprint, matching pinout (C-B-E), and overlapping h_FE/V_CEO/NF specs enable zero-layout change reuse.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2N5088	Same Process 07 origin; identical V_CEO, h_FE, and NF specs per Fairchild documentation	Identical TO-92 package and pinout; validated in same audio/sensor designs	Select 2N5088 when sourcing legacy-design-qualified inventory with full traceability
BC547B	Lower V_CEO (45 V), higher typical h_FE (200–450), but no guaranteed NF spec below 10 dB	Common in consumer electronics; not rated for extended industrial temperature range (–55°C to +150°C)	Choose BC547B only for cost-sensitive, non-critical 5–12 V applications where noise and temp range are secondary

Compared with 2N5088 and BC547B, the PN2484 delivers identical low-noise performance and extended temperature capability as the 2N5088 while offering documented Fairchild process consistency, whereas BC547B trades noise and thermal robustness for broader commercial availability.

Availability

PN2484 is available at Aetrix Electronics and suitable for audio preamplifier stages, sensor signal conditioning circuits, industrial analog interfaces, and legacy circuit replacements requiring stable component supply and long-term BOM continuity.

Supply support for PN2484 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016. Its discrete transistor portfolio emphasized reliability and broad operating conditions.

The PN2484 belongs to Fairchild's general-purpose NPN amplifier family designed for low-noise, high-gain analog signal processing in industrial, audio, and sensor interface applications - emphasizing consistent h_FE, thermal resilience, and noise-controlled operation.

FAQ

What is the pinout configuration of the PN2484?

The PN2484 uses a standard TO-92 package with Collector-Base-Emitter (C-B-E) pinout when viewed from the flat side with leads pointing downward. Pin 1 (leftmost) is Collector, Pin 2 (center) is Base, and Pin 3 (rightmost) is Emitter. This matches the MMBT2484 variant and is confirmed in Fairchild's Rev B datasheet diagrams.

Does the PN2484 support operation at elevated temperatures?

Yes, the PN2484 is rated for junction temperatures from –55°C to +150°C, making it suitable for under-hood automotive, industrial control, and outdoor instrumentation environments. Its thermal resistance R_θJA = 200 °C/W on FR-4 ensures predictable derating above 25°C ambient.

Is the PN2484 a direct replacement for the 2N5088?

Yes - the PN2484 is explicitly documented as sharing Process 07 and identical electrical characteristics with the 2N5088, including V_CEO, h_FE, NF, and TO-92 pinout. Fairchild's datasheet states "See 2N5088 for characteristics", confirming functional and mechanical equivalence.

What is the maximum collector current rating for continuous operation of the PN2484?

The PN2484 has a continuous collector current rating of 100 mA at T_A = 25°C. Derating applies above this temperature: total device dissipation drops by 5.0 mW/°C, limiting usable I_C in high-ambient scenarios unless heatsinking or reduced V_CE is applied.

How does the noise performance of the PN2484 compare to other general-purpose NPN transistors?

The PN2484 achieves a noise figure of 3.0 dB at 1 kHz (I_C = 10 µA, V_CE = 5 V), which is significantly lower than typical values for BC547 (≥8 dB) or 2N2222 (≥5 dB). This makes the PN2484 particularly suited for low-level signal amplification where SNR is critical, such as in electret microphone preamps.

PN2484 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 350mV @ 100µA, 1mA

Current - Collector Cutoff (Max):: 10nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 10µA, 5V

Power - Max:: 625 mW

Frequency - Transition:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

PN2484 FAQ

1.How can I place an order for PN2484 through Aetrix?

Please submit a Request for Quotation (RFQ) for PN2484 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 PN2484 reliable?

The price and inventory of PN2484 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PN2484 is usually 5 days.

3.What payment methods are accepted for PN2484?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PN2484 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PN2484?

PN2484 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PN2484 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 PN2484?

For technical support, including PN2484 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PN2484 requirements.

6.How does Aetrix verify that PN2484 is sourced from the original manufacturer or authorized distributors?

All PN2484 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 PN2484 meets industry standards.

7.What is the process for return or replacement of PN2484?

All PN2484 units undergo pre-shipment inspection (PSI). If there is an issue with PN2484, 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 PN2484 part is unused and in its original packaging.

Return procedure for PN2484:

1.Submit a request within 90 days.

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

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