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

onsemi MPS4124RLRAG

Name: MPS4124RLRAG
Brand: onsemi
SKU: MPS4124RLRAG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPS4124RLRAG

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MPS4124RLRAG.pdf

Description:: TRANS NPN 25V 0.2A TO92

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MPS4124RLRAG from onsemi is an NPN silicon general-purpose amplifier transistor in a Pb-free TO-92 package, rated for 25 V_CE, 200 mA continuous collector current, and 625 mW power dissipation at 25°C ambient. It delivers DC current gain (h_FE) of 120–360 at 2 mA, supports 170 MHz f_T, and is used in low-power linear amplification and switching stages of consumer audio preamps and sensor signal conditioning circuits.

For engineers reviewing the MPS4124RLRAG datasheet, pinout, applications, or equivalent options, key selection considerations include its V_CE = 25 V rating, h_FE range across operating currents, TO-92 thermal resistance (R_JA = 200°C/W), and Pb-free compliance for RoHS-constrained designs.

Technical Context

This discrete NPN bipolar junction transistor operates in active, saturation, and cutoff regions with verified breakdown voltages: V_(BR)CEO = 25 V (I_C = 1.0 mA), V_(BR)CBO = 30 V (I_C = 10 µA), and V_(BR)EBO = 5.0 V (I_E = 10 µA). Its small-signal parameters include f_T = 170 MHz at I_C = 10 mA and noise figure NF ≤ 5.0 dB at I_C = 100 µA.

Thermal performance is defined by R_JA = 200°C/W (ambient) and R_JC = 83.3°C/W (case), with junction temperature range −55°C to +150°C. Cutoff leakage is specified as I_CBO ≤ 50 nA (V_CB = 20 V) and I_EBO ≤ 50 nA (V_EB = 3.0 V).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CE max	25 V - maximum safe collector-emitter voltage before breakdown in linear operation
I_C continuous	200 mA - maximum DC collector current without thermal derating at 25°C ambient
h_FE @ 2 mA	120–360 - DC current gain range enabling predictable biasing in Class-A amplifiers
f_T	170 MHz - unity-gain bandwidth supporting RF preamp and wideband analog signal paths
R_JA	200°C/W - thermal resistance limiting power handling in still-air PCB mounting
NF	≤ 5.0 dB - noise figure suitable for low-level audio and sensor front-end amplification
V_CE(sat)	≤ 0.3 V @ I_C = 50 mA, I_B = 5 mA - low saturation voltage for efficient switching in digital logic interfaces

Pinout & Package

Package: TO-92 (Case 29-11), Pb-free, straight or bent lead options, tape-and-reel packaging (2000 units per reel).

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current sink terminal; connects to ground or low-impedance return path in common-emitter configurations
2	Base	Control input; requires current-limited drive (e.g., via 10 kΩ resistor) to bias into active region
3	Collector	Current source terminal; connects to load and supply rail in amplification or switching topologies

Key Features

Feature	Design Value
Pb-free TO-92 package	Complies with RoHS Directive 2011/65/EU; eliminates lead contamination risk in reflow soldering
High h_FE consistency	120–360 range at 2 mA enables stable DC bias design without individual transistor binning
Low V_CE(sat)	≤ 0.3 V reduces conduction loss in low-voltage switching applications (e.g., LED drivers)
170 MHz f_T	Supports amplification up to VHF band edges in receiver IF stages and oscillator buffer circuits
−55°C to +150°C T_J	Enables deployment in automotive under-hood and industrial control environments with wide ambient swings

Applications

Audio Pre-amplifier Stage	Sensor Signal Conditioning
Use Scenario: Amplifying weak microphone or piezoelectric sensor outputs in battery-powered portable recorders. IC Role / Device Role / Timing Role: NPN amplifier transistor configured in common-emitter topology with emitter degeneration for linearity. Use Value: h_FE ≥ 120 and NF ≤ 5.0 dB preserve SNR while enabling single-supply 3–5 V operation.	Use Scenario: Converting low-current photodiode or thermistor outputs into robust voltage signals for ADC input. IC Role / Device Role / Timing Role: Transimpedance or current-buffering stage with fixed base bias network. Use Value: Low I_CBO ≤ 50 nA minimizes dark-current error; V_CE = 25 V accommodates supply headroom for rail-to-rail swing.
Digital Logic Level Shifting	LED Driver Switch
Use Scenario: Interfacing 3.3 V microcontroller GPIO to 5 V TTL or CMOS logic inputs. IC Role / Device Role / Timing Role: Saturated switch translating logic HIGH/LOW states with minimal propagation delay. Use Value: V_CE(sat) ≤ 0.3 V ensures output LOW remains below 0.4 V threshold; f_T > 100 MHz supports >1 MHz toggle rates.	Use Scenario: Driving indicator LEDs or low-power status lamps from MCU I/O pins. IC Role / Device Role / Timing Role: Low-side switch with base resistor limiting I_B to achieve forced β = 10 for reliable saturation. Use Value: 200 mA I_C rating supports up to 10 parallel LEDs; TO-92 footprint simplifies manual assembly and prototyping.

Audio Pre-amplifier Stage

Sensor Signal Conditioning

Use Scenario: Amplifying weak microphone or piezoelectric sensor outputs in battery-powered portable recorders.

IC Role / Device Role / Timing Role: NPN amplifier transistor configured in common-emitter topology with emitter degeneration for linearity.

Use Value: h_FE ≥ 120 and NF ≤ 5.0 dB preserve SNR while enabling single-supply 3–5 V operation.

Use Scenario: Converting low-current photodiode or thermistor outputs into robust voltage signals for ADC input.

IC Role / Device Role / Timing Role: Transimpedance or current-buffering stage with fixed base bias network.

Use Value: Low I_CBO ≤ 50 nA minimizes dark-current error; V_CE = 25 V accommodates supply headroom for rail-to-rail swing.

Digital Logic Level Shifting

LED Driver Switch

Use Scenario: Interfacing 3.3 V microcontroller GPIO to 5 V TTL or CMOS logic inputs.

IC Role / Device Role / Timing Role: Saturated switch translating logic HIGH/LOW states with minimal propagation delay.

Use Value: V_CE(sat) ≤ 0.3 V ensures output LOW remains below 0.4 V threshold; f_T > 100 MHz supports >1 MHz toggle rates.

Use Scenario: Driving indicator LEDs or low-power status lamps from MCU I/O pins.

IC Role / Device Role / Timing Role: Low-side switch with base resistor limiting I_B to achieve forced β = 10 for reliable saturation.

Use Value: 200 mA I_C rating supports up to 10 parallel LEDs; TO-92 footprint simplifies manual assembly and prototyping.

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
BC547C	V_CE = 45 V, h_FE = 420–800 @ 2 mA, TO-92, Pb-free available	Higher voltage rating and gain spread; wider f_T variation (150–300 MHz)	Select when higher V_CE margin or tighter h_FE binning is required; verify layout compatibility due to identical TO-92 footprint
PN2222A	V_CE = 40 V, I_C = 600 mA, R_JA = 200°C/W, TO-92, Pb-free option	Higher current and voltage capability; same thermal resistance but larger die size	Choose for higher-power switching where 200 mA limit of MPS4124RLRAG is insufficient; no PCB change needed due to pinout and package match

Compared with BC547C and PN2222A, the MPS4124RLRAG offers optimized balance of gain consistency (120–360), low-noise performance (NF ≤ 5.0 dB), and RoHS compliance in a cost-sensitive TO-92 form factor-making it preferred for audio and precision analog signal paths where excessive gain spread or voltage overhead is undesirable.

Availability

MPS4124RLRAG is available at Aetrix Electronics and suitable for audio preamplifiers, sensor interface circuits, digital level shifters, and LED driver switches requiring stable component supply and RoHS-compliant manufacturing.

Supply support for MPS4124RLRAG 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 delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The MPS4124RLRAG belongs to onsemi's legacy general-purpose bipolar transistor product line, designed for cost-sensitive, medium-frequency analog amplification and switching in consumer, industrial, and communication equipment.

FAQ

What is the maximum collector-emitter voltage rating for the MPS4124RLRAG?

The MPS4124RLRAG has a maximum collector-emitter voltage (V_(BR)CEO) rating of 25 Vdc at I_C = 1.0 mA and I_B = 0. This value defines the upper limit for safe operation in the active or saturation region. Exceeding 25 V risks avalanche breakdown and permanent device damage. The MPS4124RLRAG must be operated within this limit in all circuit configurations, including transient conditions.

Does the MPS4124RLRAG have Pb-free packaging?

Yes, the MPS4124RLRAG is explicitly designated as a Pb-free device in its ordering information and marking diagram. The "G" suffix indicates RoHS-compliant termination, and the package meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for standard reflow profiles. The MPS4124RLRAG is suitable for lead-free soldering processes without modification.

What is the typical DC current gain (h_FE) range of the MPS4124RLRAG at 2 mA collector current?

The MPS4124RLRAG exhibits a DC current gain (h_FE) range of 120 to 360 when tested at I_C = 2.0 mA and V_CE = 1.0 V. This specification is guaranteed across the full operating temperature range and reflects production lot variation. Designers should use the minimum value (120) for worst-case bias calculations in the MPS4124RLRAG circuit.

Can the MPS4124RLRAG be used in RF amplifier applications?

Yes, the MPS4124RLRAG supports RF amplification up to approximately 170 MHz, as confirmed by its f_T = 170 MHz specification (measured at I_C = 10 mA, V_CE = 20 V, f = 100 MHz). It is appropriate for VHF-band preamplifiers, oscillator buffers, and low-power transmitter driver stages. However, the MPS4124RLRAG is not characterized for impedance matching or stability above 200 MHz, so external compensation may be required.

What is the thermal resistance from junction to ambient (R_JA) for the MPS4124RLRAG in a standard TO-92 mount?

The MPS4124RLRAG has a thermal resistance from junction to ambient (R_JA) of 200°C/W when mounted on a standard FR-4 PCB with no copper pour or heatsinking. This value assumes free-air convection and defines the maximum power dissipation before exceeding the 150°C maximum junction temperature. For sustained 625 mW operation, the MPS4124RLRAG requires ambient temperatures below 25°C or supplemental cooling.

MPS4124RLRAG 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:: NPN

Current - Collector (Ic) (Max):: 200 mA

Voltage - Collector Emitter Breakdown (Max):: 25 V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: 50nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 120 @ 2mA, 1V

Power - Max:: 625 mW

Frequency - Transition:: 170MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

MPS4124RLRAG FAQ

1.How can I place an order for MPS4124RLRAG through Aetrix?

Please submit a Request for Quotation (RFQ) for MPS4124RLRAG 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 MPS4124RLRAG reliable?

The price and inventory of MPS4124RLRAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPS4124RLRAG is usually 5 days.

3.What payment methods are accepted for MPS4124RLRAG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPS4124RLRAG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPS4124RLRAG?

MPS4124RLRAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPS4124RLRAG 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 MPS4124RLRAG?

For technical support, including MPS4124RLRAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPS4124RLRAG requirements.

6.How does Aetrix verify that MPS4124RLRAG is sourced from the original manufacturer or authorized distributors?

All MPS4124RLRAG 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 MPS4124RLRAG meets industry standards.

7.What is the process for return or replacement of MPS4124RLRAG?

All MPS4124RLRAG units undergo pre-shipment inspection (PSI). If there is an issue with MPS4124RLRAG, 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 MPS4124RLRAG part is unused and in its original packaging.

Return procedure for MPS4124RLRAG:

1.Submit a request within 90 days.

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

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