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2N2221A - Microchip

Description: Trans GP BJT NPN 50V 0.8A 500mW 3-Pin TO-18 Bag

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2N2221A - Microchip - PCB symbol
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2N2221A - Microchip PCB footprint - Other - Other - 2N2221A-3
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2N2221A - Microchip - 3D model - Other - 2N2221A-3
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2N2221A Details

  • Manufacturer Part Number:

    2N2221A

  • Part Life Cycle Code:

    Active

  • Country Of Origin:

    Philippines

  • ECCN Code:

    EAR99

  • Manufacturer:

    Microchip Technology Inc

  • YTEOL:

    23

  • Case Connection:

    COLLECTOR

  • Collector Current-Max (IC):

    0.8 A

  • Collector-Emitter Voltage-Max:

    50 V

  • Configuration:

    SINGLE

  • DC Current Gain-Min (hFE):

    20

  • JEDEC-95 Code:

    TO-206AA

  • JESD-30 Code:

    O-MBCY-W3

  • JESD-609 Code:

    e0

  • Number of Elements:

    1

  • Number of Terminals:

    3

  • Operating Temperature-Max:

    200 °C

  • Package Body Material:

    METAL

  • Package Shape:

    ROUND

  • Package Style:

    CYLINDRICAL

  • Polarity/Channel Type:

    NPN

  • Power Dissipation-Max (Abs):

    0.5 W

  • Qualification Status:

    Not Qualified

  • Surface Mount:

    NO

  • Terminal Finish:

    Tin/Lead (Sn/Pb)

  • Terminal Form:

    WIRE

  • Terminal Position:

    BOTTOM

  • Transistor Application:

    SWITCHING

  • Transistor Element Material:

    SILICON

  • Transition Frequency-Nom (fT):

    250 MHz

  • Turn-off Time-Max (toff):

    285 ns

  • Turn-on Time-Max (ton):

    35 ns

2N2221A Frequently Asked Questions (FAQs)

  • The maximum operating temperature range for the 2N2221A is -55°C to 150°C, but it's recommended to operate within -40°C to 125°C for optimal performance and reliability.
  • While the 2N2221A can be used as a switch, it's not ideal for high-frequency applications due to its relatively high transition frequency (ft) of 250 MHz. For high-frequency switching, consider using a transistor with a higher ft, such as the 2N3904 or 2N4401.
  • To ensure proper biasing for linear amplifier applications, use a voltage divider network to set the base voltage, and choose a collector resistor that provides the desired output impedance. Additionally, consider using a negative feedback network to improve linearity and stability.
  • The maximum collector current rating for the 2N2221A is 500 mA, but it's recommended to operate within 200-300 mA for optimal performance and reliability.
  • While the 2N2221A can be used as a Darlington pair, it's not recommended due to its relatively low current gain (hFE) of 100-300. For Darlington pair applications, consider using a transistor with a higher hFE, such as the TIP120 or TIP122.

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2N2221A Overview

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About Microchip

Microchip Technology Inc. is a leading manufacturer of microcontrollers and semiconductor devices for a wide range of applications in the aerospace, automotive, consumer electronics, industrial, and medical industries. Alongside a comprehensive product portfolio, Microchip Technology Inc. also provides easy-to-use development tools that enable engineers to create optimal designs quickly with minimal iterations to reduce risk while lowering total system costs to market. Headquartered in Chandler, Arizona, th

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2N2221A Alternates

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Image Part Number Model
Part Image JANS2N2221AL Microchip Technology Inc

Small Signal Bipolar Transistor, 0.8A I(C), 50V V(BR)CEO, 1-Element, NPN, Silicon, TO-206AA
Part Image 2N2221AG4 TT Electronics Power and Hybrid / Semelab Limited

800mA, 40V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-206AA, HERMETIC SEALED, METAL, TO-18, 3 PIN
Part Image 2N2221ALE3 Microsemi Corporation (now Microchip)

Small Signal Bipolar Transistor, 0.8A I(C), 50V V(BR)CEO, 1-Element, NPN, Silicon, TO-206AA
Part Image JAN2N2221A Texas Instruments

800mA, 50V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-206AA, CASE 22-03, TO-18, 3 PIN
Part Image JAN2N2221A National Semiconductor Corporation

Small Signal Bipolar Transistor, 0.8A I(C), 50V V(BR)CEO, 1-Element, NPN, Silicon, TO-206AA
For a full list of alternate parts for 2N2221A, check out Findchips.com