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Part Naming Conventions

Clicking on product's category allows you to see Transistors Part Naming Conventions.

  • Small-Signal Transistor

    Example of JEITA-Registered Small-Signal Transistor

    1. Transistor
    2. Circuit configuration
      • A: PNP or similar transistor
      • C: NPN or similar transistor
    3. JEITA registration number
    4. Revision code
    5. Package (may be null)
      MFV: VESM (SOT-723)
      CT: CST3

    Example of In-House-Registered Small-Signal Transistor

    1. Transistor
    2. Circuit configuration
      • A: PNP or similar transistor
      • C: NPN or similar transistor
    3. JEITA registration number
    4. Revision code
    5. Package
      FU: USM (SOT-323, SC-70)

  • Transistor with built-in resistance (BRT)

    Example of Transistor with built-in resistance (BRT)


    1. RN means Toshiba transistor that has a built-in resistance
    2. Polarity
      This number shows the polarity of a product.
      Products are classified into three types, as shown below, by the polarity.
      • 1: NPN (small-signal)
      • 2: PNP (small-signal)
      • 4: PNP + NPN
    1. & 5. Package type
    2. Serial number
      Serial numbers that start from "A1": Dual
      Serial numbers that start from "01": Single

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·Before creating and producing designs and using, customers must also refer to and comply with the latest versions of all relevant TOSHIBA information and the instructions for the application that Product will be used with or for.