MMBT2222A Transistor
2025/05/8
Переглядати: 138
The MMBT2222A from ON Semiconductor is a general-purpose, NPN bipolar junction transistor (BJT) designed for high-speed switching and amplification. Known for its compact SOT-23 surface-mount package and reliable performance, it is widely used in consumer electronics, industrial controls, communication systems, and portable devices.
This article provides a comprehensive overview of the MMBT2222A’s specifications, key features, application areas, and procurement recommendations, helping engineers and sourcing professionals better evaluate its suitability for various electronic designs.
Overview
Manufactured by ON Semiconductor and other authorized brands, the MMBT2222A is an NPN transistor housed in a space-saving SOT-23 (TO-236) package. It complies with RoHS environmental standards and is widely available for long-term supply.
This transistor is ideally suited for signal processing, linear amplification, and low-power switching applications in both consumer and industrial electronic systems.
Key Features
Transistor Type:
NPN Bipolar Junction Transistor (BJT) designed for general-purpose use.
Maximum Ratings:
Collector-Emitter Voltage (VCEO): 40V
Collector-Base Voltage (VCBO): 75V
Emitter-Base Voltage (VEBO): 6V
Collector Current (IC): 600mA
Total Power Dissipation: 350mW (at TA = 25°C)
Electrical Characteristics:
DC Current Gain (hFE): 100–300 at IC = 10mA, VCE = 10V
Transition Frequency (fT): 250MHz (typical) at VCE = 10V, IC = 20mA
Saturation Voltage (VCE(sat)): 0.3V max at IC = 150mA, IB = 15mA
Package and Mounting:
Package: SOT-23 (Surface Mount)
Dimensions: Approx. 2.9mm × 1.3mm × 1.1mm
Pin Configuration: 1–Base, 2–Emitter, 3–Collector
Operating Temperature Range:
-55°C to +150°C, making it suitable for industrial-grade environments
Other Features:
Lead-free and RoHS-compliant
Fast switching speed suitable for digital circuits
Available in tape-and-reel packaging for automated SMT production
Applications
The MMBT2222A is a versatile transistor suitable for a broad range of electronic designs, such as:
Consumer Electronics: Used for switching and signal amplification in televisions, audio devices, and wearables
Industrial Automation: Employed in sensor signal conditioning, low-voltage control systems, and driver circuits
Communication Devices: Integrated into RF modules, low-frequency amplifiers, and signal routing applications
Embedded Systems: Used in microcontroller interfaces, logic-level shifting, and protection circuits
Procurement & Alternative Models
The MMBT2222A is stocked by major authorized distributors such as Futuretech Components, Digi-Key, Mouser, and Farnell. It is available in various packaging options to support both prototype and mass production needs.
For alternative models with similar characteristics, consider:
BC847B: Similar voltage ratings with higher current gain
2N3904: Another popular NPN transistor with lower collector current rating
PZT2222A: Same internal structure in a larger SOT-223 package, offering higher power dissipation
Futuretech Components provides flexible sourcing solutions and authentic components with full traceability, helping engineers mitigate supply risks and shorten development cycles.
Conclusion
The ON Semiconductor MMBT2222A is a reliable, cost-effective solution for general-purpose signal amplification and switching. With its fast switching speed, robust ratings, and surface-mount SOT-23 form factor, it is ideal for compact and efficient circuit designs across multiple industries.
As a trusted electronic component distributor, Futuretech Components delivers genuine, traceable parts including the MMBT2222A and its equivalents. We offer professional sourcing, fast delivery, and technical support to help power your designs from concept to market.
📩 Looking for MMBT2222A or similar transistors? Contact Futuretech Components for data sheets, sourcing options, and technical support tailored to your project needs.
FAQ
What is MMBT2222A?
The MMBT2222A is a surface-mount NPN bipolar junction transistor used for amplification and fast switching applications. It is commonly employed in consumer electronics, control systems, and embedded devices.
How Does MMBT2222A Work?
The transistor amplifies or switches signals by controlling current flow from collector to emitter via a base current. In saturation mode, it acts like a closed switch; in cut-off mode, like an open switch.
What Are the Key Specifications of MMBT2222A?
VCEO: 40V, IC: 600mA
hFE: 100–300 at VCE = 10V
Power Dissipation: 350mW
Package: SOT-23
Transition Frequency: 250MHz
What Are the Pros and Cons of MMBT2222A?
Pros:
✔ High-speed switching (250MHz typical)
✔ Compact SOT-23 package for space-saving designs
✔ Good current handling (up to 600mA)
✔ RoHS-compliant and lead-free
Cons:
✖ Limited to low-to-medium power applications
✖ Requires careful thermal management in dense PCB layouts
Are There Any Equivalents/Alternatives to MMBT2222A?
Yes. Alternatives include:
2N3904 (lower current, through-hole and SMT options)
BC847B (higher gain, similar SOT-23 footprint)
MMBT2222ALT1G (alternate manufacturer variant from ON Semiconductor)
These substitutes offer similar performance depending on your voltage, current, and packaging needs.
