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

onsemi MMBT2222AK

Name: MMBT2222AK
Brand: onsemi
SKU: MMBT2222AK
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBT2222AK

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MMBT2222AK.pdf

Description:: TRANS NPN 40V 0.6A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MMBT2222AK from ON Semiconductor (formerly Fairchild) is a general-purpose NPN epitaxial silicon transistor in SOT-23 package, rated for 40 V V_CEO, 600 mA I_C, and 350 mW P_C; used in low-power switching and amplification circuits such as LED drivers, signal buffering, and logic-level translation in industrial control modules.

For engineers reviewing the MMBT2222AK datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain (h_FE = 75–300 at I_C = 10–500 mA), saturation voltage (V_CE(sat) = 0.3 V @ 150 mA), f_T = 300 MHz, noise figure = 4 dB, and SOT-23 thermal performance under continuous operation.

Technical Context

This NPN bipolar junction transistor employs epitaxial base construction for stable h_FE across temperature and current ranges, with verified breakdown voltages of 75 V V_CBO, 40 V V_CEO, and 6 V V_EBO. Its 300 MHz f_T supports RF preamplifier and high-speed switching up to ~10 MHz square-wave operation.

Thermal design is constrained by 350 mW maximum power dissipation at T_A = 25°C and derating to zero at 150°C junction temperature; Cob = 8 pF at V_CB = 10 V enables use in <50 MHz small-signal stages without excessive Miller effect.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage before avalanche conduction in common-emitter configuration.
I_C	600 mA - Continuous collector current limit defining usable load drive capability in switching applications.
h_FE	75–300 - DC current gain range at V_CE = 10 V, enabling predictable base drive sizing for 10–500 mA loads.
V_CE(sat)	0.3 V @ 150 mA - Low saturation voltage minimizes power loss and heating in on-state switching.
f_T	300 MHz - Unity-gain bandwidth confirming suitability for RF amplification up to ~100 MHz with gain margin.
C_ob	8 pF @ V_CB = 10 V - Output capacitance limiting high-frequency response and affecting switching speed in capacitive-loaded circuits.
NF	4 dB @ I_C = 100 µA - Low noise figure supporting use in sensitive preamplifier stages where signal integrity is critical.

Pinout & Package

SOT-23 plastic surface-mount package with 3-pin configuration, 1.90 mm × 1.30 mm footprint, 0.95 mm height, and gull-wing leads compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base current to bias transistor into active or saturation region; requires series resistor to limit I_B per h_FE and load requirements.
2 (Emitter)	Current return path	Connected to ground or low-side reference; carries full emitter current (I_E ≈ I_C + I_B) and defines common node for bias network.
3 (Collector)	Output current terminal	Delivers switched or amplified load current; must be routed with adequate copper area for thermal management at >200 mA continuous operation.

Key Features

Feature	Design Value
Epitaxial base structure	Ensures tight h_FE distribution and stable gain over temperature (−55°C to 150°C).
Low V_CE(sat)	0.3 V at I_C = 150 mA enables efficient switching in battery-powered logic interfaces and LED drivers.
High f_T	300 MHz supports broadband amplification and fast edge-rate digital signal conditioning.
Low noise figure	4 dB at 1 MHz allows use in analog front-end preamplifiers without degrading SNR in sensor signal chains.
SOT-23 footprint	Enables high-density PCB layouts and compatibility with automated pick-and-place assembly processes.

Applications

LED Driver Circuits	Logic-Level Translation
Use Scenario: Driving 20–100 mA indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins. IC Role / Device Role / Timing Role: NPN switch operating in saturation mode to sink LED current to ground. Use Value: V_CE(sat) ≤ 0.3 V ensures minimal voltage drop and >95% efficiency at 50 mA, reducing thermal load on MCU I/O.	Use Scenario: Converting 3.3 V logic outputs to interface with 5 V TTL inputs in mixed-voltage systems. IC Role / Device Role / Timing Role: Level-shifting transistor configured in common-emitter open-collector mode. Use Value: h_FE ≥ 75 guarantees reliable turn-on with 10 kΩ pull-up, supporting >1 MHz data rates without propagation delay penalty.
Small-Signal Amplification	Relay/Load Switching
Use Scenario: Amplifying low-amplitude sensor signals (e.g., thermistor bridge, photodiode) in industrial monitoring nodes. IC Role / Device Role / Timing Role: Common-emitter amplifier biased in active region for voltage gain. Use Value: NF = 4 dB and f_T = 300 MHz preserve signal fidelity up to 10 MHz while minimizing added noise in 1 kΩ source impedance.	Use Scenario: Controlling 12 V/100 mA relay coils or solenoid valves from embedded controller outputs. IC Role / Device Role / Timing Role: High-current saturated switch handling inductive loads with flyback protection. Use Value: I_C = 600 mA rating and t_OFF = 285 ns allow clean turn-off with RC snubber, preventing contact arcing and MCU reset events.

LED Driver Circuits

Logic-Level Translation

Use Scenario: Driving 20–100 mA indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins.

IC Role / Device Role / Timing Role: NPN switch operating in saturation mode to sink LED current to ground.

Use Value: V_CE(sat) ≤ 0.3 V ensures minimal voltage drop and >95% efficiency at 50 mA, reducing thermal load on MCU I/O.

Use Scenario: Converting 3.3 V logic outputs to interface with 5 V TTL inputs in mixed-voltage systems.

IC Role / Device Role / Timing Role: Level-shifting transistor configured in common-emitter open-collector mode.

Use Value: h_FE ≥ 75 guarantees reliable turn-on with 10 kΩ pull-up, supporting >1 MHz data rates without propagation delay penalty.

Small-Signal Amplification

Relay/Load Switching

Use Scenario: Amplifying low-amplitude sensor signals (e.g., thermistor bridge, photodiode) in industrial monitoring nodes.

IC Role / Device Role / Timing Role: Common-emitter amplifier biased in active region for voltage gain.

Use Value: NF = 4 dB and f_T = 300 MHz preserve signal fidelity up to 10 MHz while minimizing added noise in 1 kΩ source impedance.

Use Scenario: Controlling 12 V/100 mA relay coils or solenoid valves from embedded controller outputs.

IC Role / Device Role / Timing Role: High-current saturated switch handling inductive loads with flyback protection.

Use Value: I_C = 600 mA rating and t_OFF = 285 ns allow clean turn-off with RC snubber, preventing contact arcing and MCU reset events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
PN2222A	TO-92 package, higher P_C = 625 mW, same V_CEO/I_C/h_FE specs but slower f_T = 250 MHz.	Through-hole mounting only; unsuitable for space-constrained SMT designs.	Select when manual prototyping or legacy through-hole boards require direct functional replacement.
MMBT3904	Lower I_C = 200 mA, lower P_C = 310 mW, higher h_FE = 100–300, identical SOT-23 package and pinout.	Not suitable for >200 mA loads; preferred in ultra-low-power bias networks and low-current amplifiers.	Select when load current ≤ 150 mA and tighter h_FE tolerance is required, with no PCB layout change.

Compared with PN2222A and MMBT3904, the MMBT2222AK delivers optimal balance of SMT compatibility, 600 mA drive capability, and 300 MHz bandwidth-making it preferred for compact, medium-current switching and amplification where TO-92 is impractical and MMBT3904 lacks current headroom.

Availability

MMBT2222AK is available at Aetrix Electronics and suitable for LED driver circuits, logic-level translation, small-signal amplification, and relay/load switching requiring stable component supply and consistent parametric performance across production batches.

Supply support for MMBT2222AK 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 IoT applications.

The MMBT2222AK belongs to ON Semiconductor's general-purpose bipolar transistor product line, designed for cost-sensitive, high-volume applications demanding reliability, consistency, and broad operating temperature support (−55°C to 150°C).

FAQ

What is the maximum continuous collector current for MMBT2222AK?

The MMBT2222AK supports a maximum continuous collector current of 600 mA at T_A = 25°C. Derating applies above 25°C ambient; at 100°C, the usable I_C drops to approximately 350 mA due to thermal limits. This rating assumes proper PCB copper pour and airflow; exceeding it risks thermal runaway or permanent degradation of h_FE. Always verify actual board-level thermal performance using the device's 350 mW P_C limit and junction-to-ambient thermal resistance.

Is MMBT2222AK pin-compatible with MMBT3904?

Yes, the MMBT2222AK is pin-compatible with the MMBT3904 in the SOT-23 package: Pin 1 is Base, Pin 2 is Emitter, Pin 3 is Collector. However, MMBT2222AK supports higher collector current (600 mA vs. 200 mA) and higher power dissipation (350 mW vs. 310 mW), making it a functional upgrade in current-demanding applications-but not a guaranteed drop-in replacement without verifying h_FE and saturation behavior in the target circuit.

What is the typical DC current gain (h_FE) of MMBT2222AK at 10 mA collector current?

At V_CE = 10 V and I_C = 10 mA, the MMBT2222AK exhibits a typical DC current gain (h_FE) of 75, with a minimum of 50 and maximum of 300 across production lots. This wide range reflects process variation; design margins should accommodate the min/max values-not just the typical-especially in production-critical bias networks where gain directly affects operating point stability.

Can MMBT2222AK be used in RF amplifier stages?

Yes, the MMBT2222AK has an f_T of 300 MHz and Cob = 8 pF, making it suitable for RF amplifier stages up to approximately 100 MHz with modest gain. It is commonly used in VHF receiver front-ends, IF amplifiers, and low-power transmitter driver stages. Performance depends heavily on proper biasing, impedance matching, and layout; avoid using it beyond its f_T/10 rule-of-thumb for stable gain without oscillation.

What is the operating junction temperature range for MMBT2222AK?

The MMBT2222AK has an operating junction temperature range of −55°C to +150°C, matching its storage temperature specification. This wide range supports deployment in harsh environments such as automotive engine compartments, industrial motor controls, and outdoor telecom equipment. Thermal design must ensure that power dissipation and ambient conditions keep T_J within this window-exceeding 150°C risks irreversible parametric shift or bond-wire failure.

MMBT2222AK 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):: 600 mA

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 10V

Power - Max:: 350 mW

Frequency - Transition:: 300MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBT2222AK FAQ

1.How can I place an order for MMBT2222AK through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBT2222AK 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 MMBT2222AK reliable?

The price and inventory of MMBT2222AK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT2222AK is usually 5 days.

3.What payment methods are accepted for MMBT2222AK?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT2222AK transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT2222AK?

MMBT2222AK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBT2222AK 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 MMBT2222AK?

For technical support, including MMBT2222AK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT2222AK requirements.

6.How does Aetrix verify that MMBT2222AK is sourced from the original manufacturer or authorized distributors?

All MMBT2222AK 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 MMBT2222AK meets industry standards.

7.What is the process for return or replacement of MMBT2222AK?

All MMBT2222AK units undergo pre-shipment inspection (PSI). If there is an issue with MMBT2222AK, 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 MMBT2222AK part is unused and in its original packaging.

Return procedure for MMBT2222AK:

1.Submit a request within 90 days.

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

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