Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi KST2484MTF

Name: KST2484MTF
Brand: onsemi
SKU: KST2484MTF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: KST2484MTF

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: KST2484MTF.pdf

Description:: TRANS NPN 60V 0.05A SOT-23-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,975

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

KST2484MTF from ON Semiconductor (formerly Fairchild) is an NPN epitaxial silicon transistor optimized for low-noise amplifier stages in RF and audio signal paths, with 60 V V_CEO, 50 mA I_C, 350 mW P_C, and 3 dB noise figure at 1 kHz. It serves as a high-gain, low-noise active device in preamplifier inputs and oscillator bias networks.

For engineers reviewing the KST2484MTF datasheet, pinout, applications, or equivalent options, key selection criteria include verified h_FE range (250–800), V_BE(on) = 0.95 V at I_C = 1 mA, Cob = 6 pF, and SOT-23 package compatibility with high-density PCB layouts.

Technical Context

This transistor employs epitaxial base construction to achieve stable DC current gain across operating current ranges and low 1/f noise performance critical for analog front-end design. Its breakdown ratings-60 V V_CBO, 60 V V_CEO, and 5 V V_EBO-support operation in medium-voltage small-signal circuits without derating.

The device exhibits V_CE(sat) = 0.35 V at I_C = 1 mA / I_B = 0.1 mA and C_ob = 6 pF at V_CB = 5 V, enabling predictable switching behavior and minimal Miller effect in tuned amplifier configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - supports rail-to-rail operation up to ±30 V supply in single-ended amplifiers
I_C	50 mA - sufficient for Class-A small-signal amplification without thermal runaway in SOT-23
h_FE	250–800 - enables stable biasing across process variation in discrete gain stages
NF	3 dB @ 1 kHz - meets low-noise requirements for microphone preamps and sensor interfaces
C_ob	6 pF @ 5 V - minimizes capacitive loading on high-impedance collector nodes
V_BE(on)	0.95 V @ I_C = 1 mA - defines precise base drive voltage for predictable turn-on in bias networks
P_C	350 mW - sets maximum dissipation limit under continuous DC operation in ambient air

Pinout & Package

SOT-23 surface-mount plastic package with gull-wing leads; 1.30 mm body height, 2.90 mm length, and 1.30 mm width; rated for reflow soldering per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input node; requires series resistor to limit I_B and stabilize h_FE-dependent bias
2	Emitter	Common reference terminal; connected to ground or emitter degeneration resistor in CE configuration
3	Collector	Active output node; drives load impedance while maintaining V_CE ≥ 0.35 V to avoid saturation distortion

Key Features

Feature	Design Value
Low noise figure	3 dB at 1 kHz - reduces audible hiss in audio preamp stages and improves SNR in sensor signal chains
High DC current gain	h_FE = 250–800 - allows low-base-drive designs and stable bias with minimal temperature drift
Low output capacitance	C_ob = 6 pF - preserves bandwidth in RF amplifier matching networks and crystal oscillator tank circuits
Medium-voltage rating	V_CEO = 60 V - enables use in 24 V and 48 V industrial control signal conditioning without external clamping

Applications

Audio Preamplifier Input Stage	RF Oscillator Bias Network
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors before ADC sampling. IC Role / Device Role / Timing Role: Discrete NPN transistor configured in common-emitter topology to provide initial voltage gain with minimal added noise. Use Value: 3 dB NF and h_FE ≥ 250 ensure >60 dB SNR at 1 kHz and stable gain over temperature in battery-powered recorders.	Use Scenario: Providing controlled bias current to sustain oscillation in Colpitts or Clapp LC tank circuits. IC Role / Device Role / Timing Role: Active element establishing DC operating point while contributing minimal phase shift and parasitic capacitance. Use Value: 6 pF C_ob and 60 V V_CEO allow reliable startup and frequency stability up to 100 MHz in VHF oscillator designs.
Industrial Sensor Signal Conditioning	Low-Power Analog Front-End
Use Scenario: Amplifying millivolt-level outputs from thermocouples or strain gauges in PLC analog input modules. IC Role / Device Role / Timing Role: First-stage gain block with emitter degeneration to linearize response and reject common-mode noise. Use Value: V_CE(sat) = 0.35 V ensures headroom for rail-to-rail swing on 3.3 V or 5 V supplies while maintaining linearity.	Use Scenario: Implementing discrete transconductance stages in ultra-low-power IoT sensor nodes with <100 µA quiescent current. IC Role / Device Role / Timing Role: Low-I_C active device operating at 10–100 µA collector current to minimize system power budget. Use Value: Verified I_CBO ≤ 10 nA and h_FE ≥ 250 at I_C = 10 µA enable stable sub-100 µA biasing without leakage-induced drift.

Audio Preamplifier Input Stage

RF Oscillator Bias Network

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

IC Role / Device Role / Timing Role: Discrete NPN transistor configured in common-emitter topology to provide initial voltage gain with minimal added noise.

Use Value: 3 dB NF and h_FE ≥ 250 ensure >60 dB SNR at 1 kHz and stable gain over temperature in battery-powered recorders.

Use Scenario: Providing controlled bias current to sustain oscillation in Colpitts or Clapp LC tank circuits.

IC Role / Device Role / Timing Role: Active element establishing DC operating point while contributing minimal phase shift and parasitic capacitance.

Use Value: 6 pF C_ob and 60 V V_CEO allow reliable startup and frequency stability up to 100 MHz in VHF oscillator designs.

Industrial Sensor Signal Conditioning

Low-Power Analog Front-End

Use Scenario: Amplifying millivolt-level outputs from thermocouples or strain gauges in PLC analog input modules.

IC Role / Device Role / Timing Role: First-stage gain block with emitter degeneration to linearize response and reject common-mode noise.

Use Value: V_CE(sat) = 0.35 V ensures headroom for rail-to-rail swing on 3.3 V or 5 V supplies while maintaining linearity.

Use Scenario: Implementing discrete transconductance stages in ultra-low-power IoT sensor nodes with <100 µA quiescent current.

IC Role / Device Role / Timing Role: Low-I_C active device operating at 10–100 µA collector current to minimize system power budget.

Use Value: Verified I_CBO ≤ 10 nA and h_FE ≥ 250 at I_C = 10 µA enable stable sub-100 µA biasing without leakage-induced drift.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise NPN transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT2484	Same die, identical electrical specs; marked MMBT2484 per ON Semi standardization	No functional difference; used interchangeably in new designs and legacy BOMs	Select MMBT2484 for new designs requiring current ON Semiconductor part numbering
KSC1845YTA	Higher V_CEO = 120 V, lower h_FE = 70–700, higher P_C = 200 mW in SOT-23	Better suited for higher-voltage switching; less optimal for ultra-low-noise audio due to wider h_FE spread	Choose KSC1845YTA only when >60 V breakdown or higher power handling is required

Compared with MMBT2484, KST2484MTF offers identical performance but reflects legacy Fairchild marking; versus KSC1845YTA, it delivers tighter h_FE control and lower noise at the expense of voltage headroom-making it preferable for precision low-noise analog stages.

Availability

KST2484MTF is available at Aetrix Electronics and suitable for audio preamplifiers, RF oscillator circuits, industrial sensor interfaces, and low-power analog front-ends requiring stable component supply and long-term obsolescence management.

Supply support for KST2484MTF 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.

The KST2484MTF belongs to ON Semiconductor's legacy low-noise bipolar transistor product line, designed specifically for high-fidelity analog signal amplification and stable biasing in compact, cost-sensitive systems.

FAQ

What is the maximum collector-emitter voltage rating for KST2484MTF?

The KST2484MTF has a maximum collector-emitter voltage (V_CEO) rating of 60 V at T_A = 25°C. This rating remains valid up to 150°C storage temperature but requires derating above 25°C ambient per the device's thermal resistance curve. The KST2484MTF must not be operated beyond this limit to prevent avalanche breakdown or permanent junction damage.

Does KST2484MTF support low-noise audio applications?

Yes, the KST2484MTF is explicitly characterized for low-noise operation with a noise figure of 3 dB at 1 kHz, 10 µA I_C, and 10 kΩ source resistance. Its low 1/f noise and tight h_FE distribution make the KST2484MTF suitable for electret microphone preamplifiers, piezo sensor buffers, and other audio front-end stages where SNR is critical.

What package type is used for KST2484MTF?

The KST2484MTF uses the SOT-23 surface-mount package with standardized pinout: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. Dimensions are 2.90 mm × 1.30 mm × 1.14 mm, compliant with JEDEC MO-178AB, and qualified for lead-free reflow soldering per J-STD-020.

How does the DC current gain (h_FE) vary across operating conditions for KST2484MTF?

The KST2484MTF specifies h_FE = 250–800 at V_CE = 5 V, with minimum 250 at I_C = 1 mA and typical 800 at I_C = 10 mA. Gain decreases at lower currents (<100 µA) and higher temperatures (>85°C), but the KST2484MTF maintains usable h_FE ≥ 150 across its full rated I_C and T_J range.

Is KST2484MTF pin-compatible with MMBT2484?

Yes, the KST2484MTF is physically and electrically identical to MMBT2484-same SOT-23 package, same pinout, and identical absolute maximum ratings and electrical characteristics. The KST2484MTF is the legacy Fairchild marking; MMBT2484 is the current ON Semiconductor designation. Both may be used interchangeably without layout or schematic changes.

KST2484MTF 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):: 50 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:: 250 @ 1mA, 5V

Power - Max:: 350 mW

Frequency - Transition:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

KST2484MTF FAQ

1.How can I place an order for KST2484MTF through Aetrix?

Please submit a Request for Quotation (RFQ) for KST2484MTF 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 KST2484MTF reliable?

The price and inventory of KST2484MTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KST2484MTF is usually 5 days.

3.What payment methods are accepted for KST2484MTF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KST2484MTF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KST2484MTF?

KST2484MTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KST2484MTF 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 KST2484MTF?

For technical support, including KST2484MTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KST2484MTF requirements.

6.How does Aetrix verify that KST2484MTF is sourced from the original manufacturer or authorized distributors?

All KST2484MTF 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 KST2484MTF meets industry standards.

7.What is the process for return or replacement of KST2484MTF?

All KST2484MTF units undergo pre-shipment inspection (PSI). If there is an issue with KST2484MTF, 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 KST2484MTF part is unused and in its original packaging.

Return procedure for KST2484MTF:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…