**How to Read SMD Capacitor Code**

**Introduction**

Surface Mount Devices (SMD) capacitors have become a ubiquitous component in modern electronics. With the increasing demand for smaller and more compact designs, SMD capacitors have revolutionized the way we design and manufacture electronic circuits. However, one of the challenges that comes with using SMD capacitors is deciphering the cryptic codes printed on them. In this article, we will explore how to read SMD capacitor codes and understand their significance.

**SMD Capacitor Code Structure**

The code on an SMD capacitor typically consists of three parts:

**First Character: Capacitance**

The first character on an SMD capacitor represents the capacitance value. The character can be a letter or a number, and it is followed by a multiplier.

**Letter Code**

The letter code is used to represent the capacitance value in picofarads (pF). The letters and their corresponding capacitance values are as follows:

Letter | Capacitance Value (pF) |
---|---|

A | 100pF |

B | 220pF |

C | 330pF |

D | 470pF |

E | 680pF |

F | 1000pF |

**Numerical Code**

The numerical code represents the capacitance value in picofarads (pF). The numerical code is usually a three-digit number, where the first two digits represent the significant figures and the last digit represents the multiplier.

Numerical Code | Capacitance Value (pF) |
---|---|

104 | 100000pF |

225 | 220000pF |

335 | 330000pF |

**Second Character: Tolerance**

The second character on an SMD capacitor represents the tolerance value. The tolerance value indicates the allowed variation in capacitance from the nominal value.

**Tolerance Codes**

The tolerance codes and their corresponding values are as follows:

Tolerance Code | Tolerance Value (%) |
---|---|

F | ±1% |

G | ±2% |

J | ±5% |

K | ±10% |

M | ±20% |

**Third Character: Voltage Rating**

The third character on an SMD capacitor represents the voltage rating. The voltage rating indicates the maximum voltage that the capacitor can withstand.

**Voltage Rating Codes**

The voltage rating codes and their corresponding values are as follows:

Voltage Rating Code | Voltage Rating (V) |
---|---|

0 | 4V |

1 | 10V |

2 | 16V |

3 | 25V |

4 | 35V |

**Example: Deciphering an SMD Capacitor Code**

Let's take an example of an SMD capacitor with the code "104K250".

- The first character "104" represents the capacitance value, which is 100,000pF (100nF).
- The second character "K" represents the tolerance value, which is ±10%.
- The third character "250" represents the voltage rating, which is 25V.

Therefore, the SMD capacitor with the code "104K250" has a capacitance value of 100nF, a tolerance of ±10%, and a voltage rating of 25V.

**Conclusion**

In conclusion, reading SMD capacitor codes requires a basic understanding of the code structure and the values represented by each character. By following the guidelines outlined in this article, you can easily decipher the code on an SMD capacitor and understand its capacitance value, tolerance, and voltage rating.