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

onsemi MMBT2484

Name: MMBT2484
Brand: onsemi
SKU: MMBT2484
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBT2484

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MMBT2484.pdf

Description:: TRANS NPN 60V 0.1A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Inventory:8,663

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Product details

Overview

MMBT2484 from ON 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, 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 preamplifier stages of audio and signal conditioning circuits.

For engineers reviewing the MMBT2484 datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 package compatibility, low-noise performance at microamp bias, thermal resistance (R_θJA = 357 °C/W on FR-4), and guaranteed h_FE minimums across temperature.

Technical Context

The MMBT2484 is fabricated using Fairchild's Process 07, a planar epitaxial NPN process optimized for high-current gain and low noise at low collector currents. Its structure supports stable DC amplification with minimal parameter drift over -55°C to +150°C junction temperature range.

It operates as a discrete linear amplifier with fixed bias configurations - not intended for switching or RF power applications. Small-signal parameters (C_obo = 6.0 pF, C_ibo = 6.0 pF) confirm suitability for audio-band and sub-MHz analog gain stages where capacitance matching and noise floor matter.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - supports rail-to-rail operation in ±30 V supply systems without breakdown risk
I_C (max)	100 mA - enables use in medium-current preamp and driver stages without derating below 25°C
h_FE (min)	30 at I_C = 1 µA - ensures usable gain even in ultra-low-power sensor interface designs
Noise Figure	3.0 dB at 1 kHz - meets low-noise requirements for microphone preamps and instrumentation front-ends
R_θJA	357 °C/W on FR-4 PCB - defines thermal headroom for 350 mW dissipation limit at ambient ≤ 50°C
V_BE(on)	0.5–0.7 V - simplifies bias network design with predictable base-emitter drop across operating range

Pinout & Package

MMBT2484 is supplied in TO-92 plastic package (standard radial leaded configuration), marked "1U", with leads arranged in Emitter–Base–Collector order when viewed from flat side with leads down.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Reference node for bias networks; connects to ground or negative rail in common-emitter topology
Base (B)	Control input	Accepts small-signal current to modulate collector current; requires series resistor for stable DC bias
Collector (C)	Current source output	Drives load or next stage; voltage swing limited by V_CEO = 60 V and thermal constraints

Key Features

Feature	Design Value
Low-noise amplification	3.0 dB NF at 1 kHz enables clean signal recovery in mic-level and sensor interfaces
High DC current gain	h_FE ≥ 500 at I_C = 100 µA supports stable biasing with minimal base drive current
Wide operating temperature	-55°C to +150°C junction range allows deployment in automotive under-hood and industrial control environments
TO-92 mechanical standardization	Compatible with legacy through-hole assembly lines and manual prototyping workflows

Applications

Audio Preamplifier Stage	Instrumentation Signal Conditioning
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors before ADC sampling. IC Role / Device Role / Timing Role: Discrete NPN amplifier in common-emitter configuration providing 40–60 dB voltage gain. Use Value: Low 3.0 dB noise figure preserves SNR; high h_FE minimizes base current loading on high-impedance sources.	Use Scenario: Boosting millivolt-level outputs from thermocouples or strain gauges in data acquisition modules. IC Role / Device Role / Timing Role: First-stage linear amplifier with precision DC coupling and low offset contribution. Use Value: Guaranteed h_FE ≥ 30 at 1 µA enables stable gain at ultra-low quiescent current, reducing self-heating error.
Low-Power Sensor Interface	Industrial Analog Front-End
Use Scenario: Biasing photodiodes or Hall-effect sensors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Transimpedance or current-amplifier stage operating at sub-100 µA collector current. Use Value: Validated h_FE ≥ 100 at I_C = 10 µA ensures predictable gain without active bias compensation.	Use Scenario: Signal buffering and level-shifting in PLC analog input modules exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Robust DC-coupled gain block with thermal stability across -40°C to +85°C ambient. Use Value: Specified operation to +150°C junction enables reliable function in uncooled enclosures near motor drives or power supplies.

Audio Preamplifier Stage

Instrumentation Signal Conditioning

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

IC Role / Device Role / Timing Role: Discrete NPN amplifier in common-emitter configuration providing 40–60 dB voltage gain.

Use Value: Low 3.0 dB noise figure preserves SNR; high h_FE minimizes base current loading on high-impedance sources.

Use Scenario: Boosting millivolt-level outputs from thermocouples or strain gauges in data acquisition modules.

IC Role / Device Role / Timing Role: First-stage linear amplifier with precision DC coupling and low offset contribution.

Use Value: Guaranteed h_FE ≥ 30 at 1 µA enables stable gain at ultra-low quiescent current, reducing self-heating error.

Low-Power Sensor Interface

Industrial Analog Front-End

Use Scenario: Biasing photodiodes or Hall-effect sensors in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Transimpedance or current-amplifier stage operating at sub-100 µA collector current.

Use Value: Validated h_FE ≥ 100 at I_C = 10 µA ensures predictable gain without active bias compensation.

Use Scenario: Signal buffering and level-shifting in PLC analog input modules exposed to wide ambient temperatures.

IC Role / Device Role / Timing Role: Robust DC-coupled gain block with thermal stability across -40°C to +85°C ambient.

Use Value: Specified operation to +150°C junction enables reliable function in uncooled enclosures near motor drives or power supplies.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2N5088	Same Process 07 origin; identical V_CEO, h_FE, and NF specs per datasheet cross-reference	TO-92 package, same pinout - direct functional match with no circuit redesign needed	Select 2N5088 when legacy BOMs require exact historical part number; identical electrical behavior confirmed
BC547B	Lower V_CEO (45 V), higher typical NF (10 dB), h_FE min = 200 at I_C = 2 mA	Common-emitter gain stages where 60 V rating is not required and noise is less critical	Choose BC547B only if system rail voltage stays ≤ 30 V and noise budget allows >7 dB degradation

Compared with 2N5088, MMBT2484 offers identical performance in a standardized marking and packaging format; versus BC547B, it delivers superior noise floor and voltage margin - critical for precision low-level analog signal paths.

Availability

MMBT2484 is available at Aetrix Electronics and suitable for audio preamplifier stages, instrumentation signal conditioning, and low-power sensor interface applications requiring stable component supply and long-term manufacturability.

Supply support for MMBT2484 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

ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensing solutions.

The MMBT2484 belongs to ON Semiconductor's general-purpose bipolar transistor product line, designed specifically for low-noise, high-gain linear amplification in cost-sensitive analog signal chains.

FAQ

What is the maximum collector-emitter voltage rating for MMBT2484?

The MMBT2484 has a guaranteed V_CEO rating of 60 V at T_A = 25°C. This rating remains valid up to +150°C junction temperature, making MMBT2484 suitable for applications with transient voltage spikes or elevated supply rails where margin beyond 45 V is required.

Does MMBT2484 have a specified noise figure, and under what conditions?

Yes, MMBT2484 specifies a noise figure of 3.0 dB measured at I_C = 10 µA, V_CE = 5.0 V, R_S = 10 kΩ, f = 1.0 kHz, and BW = 200 Hz. This value is validated per JEDEC test methods and reflects actual small-signal performance in low-current preamplifier configurations.

What package type is used for MMBT2484, and how are the leads arranged?

MMBT2484 uses the industry-standard TO-92 plastic package with straight leads and marking "1U". When viewed from the flat side with leads pointing downward, the pin order is Emitter–Base–Collector (E-B-C), matching JEDEC TO-92 outline dimensions and orientation.

Is MMBT2484 suitable for operation at elevated ambient temperatures?

Yes, MMBT2484 is rated for junction temperatures from -55°C to +150°C. Its thermal resistance R_θJA = 357 °C/W on FR-4 ensures safe operation at ambient temperatures up to +85°C in typical PCB layouts - verified in ON Semiconductor's published thermal characterization data for MMBT2484.

How does the DC current gain (h_FE) of MMBT2484 vary with collector current?

MMBT2484 provides h_FE ≥ 30 at I_C = 1 µA, ≥ 100 at I_C = 10 µA, ≥ 175 at I_C = 100 µA, ≥ 250 at I_C = 1 mA, and ≥ 500 at I_C = 10 mA - all tested at V_CE = 5.0 V and T_A = 25°C. This broad h_FE range supports flexible bias point selection across low- and medium-current analog designs.

MMBT2484 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

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:: 350 mW

Frequency - Transition:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBT2484 FAQ

1.How can I place an order for MMBT2484 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBT2484 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 MMBT2484 reliable?

The price and inventory of MMBT2484 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT2484 is usually 5 days.

3.What payment methods are accepted for MMBT2484?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT2484 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT2484?

MMBT2484 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBT2484 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 MMBT2484?

For technical support, including MMBT2484 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT2484 requirements.

6.How does Aetrix verify that MMBT2484 is sourced from the original manufacturer or authorized distributors?

All MMBT2484 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 MMBT2484 meets industry standards.

7.What is the process for return or replacement of MMBT2484?

All MMBT2484 units undergo pre-shipment inspection (PSI). If there is an issue with MMBT2484, 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 MMBT2484 part is unused and in its original packaging.

Return procedure for MMBT2484:

1.Submit a request within 90 days.

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

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