Detailed explanation of chip resistor labels and resistance value comparison table

In electronic components,Chip resistorIt is widely used because of its small size, stable performance and easy automated production. patchresistanceThe identification of labels and resistance values ​​is an important part of electronic design and maintenance. This article will introduce in detail the labeling system and resistance value comparison method of chip resistors to help readers quickly and accurately identify and select chip resistors.

Chip resistor (SMD Resistor) is an electronic component in which a resistive element is made into a small package to facilitate automated mounting. The resistance value is usually represented by numbers or letters printed on the surface. Due to its small size, the space for directly marking the resistance value is limited, so specific coding rules are adopted.

The labels of chip resistors mainly come in two forms: three-digit numbers and four-digit numbers.

Three-digit number: the first two digits are significant digits, and the third digit is the multiplier. For example, "472" means 47×10²=4700Ω.

Four-digit number: the first three digits are significant digits, and the fourth digit is the multiplier. For example, "1001" means 100×10¹=1000Ω.

In addition, there is also a letter labeling method, usually using letters to represent units, such as "R" representing the decimal point.

The resistance units of chip resistors are usually ohms (Ω), kiloohms (kΩ) and megaohms (MΩ). In order to save space, letters are used instead of decimal points in labels, such as "4R7" represents 4.7Ω, "1K0" represents 1.0kΩ, and "2M2" represents 2.2MΩ.

The resistance comparison table is a convenient tool to match the chip resistor label with the actual resistance value. Through the comparison table, engineers and maintenance personnel can quickly determine the resistance value to avoid misjudgment and improve work efficiency.

| Label | Resistance | Description |

|-------|-----------|----------------|

| 000 | 0Ω | Connecting wire or zero resistance |

| 100 | 10Ω | 10 ohms |

| 472 | 4.7kΩ | 4700 ohms |

| 1K0 | 1kΩ | 1000 ohms |

| 4R7 | 4.7Ω | Decimal point representation |

| 2M2 | 2.2MΩ | Megohms |

When selecting chip resistors, the resistance value, power and accuracy should be selected according to circuit design requirements. After identifying the resistance value by the label, confirm whether the resistance value meets the circuit requirements, and pay attention to the power level (such as 1/8W, 1/4W, etc.) and error range (such as ±1%, ±5%, etc.) of the resistor.

注意标号中“R”、“K”、“M”字母的含义。

三位或四位数字的乘数规则。

特殊标号如“000”代表零阻值。

不同厂家可能有细微差别，需结合具体产品手册。

除了识别标号外，使用万用表测量贴片电阻阻值是验证的有效方法。测量时，应断开电路，避免误差。

贴片电阻的标号及阻值对照表是电子工程领域重要的基础知识。掌握标号的编码规则和阻值识别方法，有助于提高电子设计与维修的准确性和效率。本文通过对贴片电阻标号的详细解析和阻值对照展示，帮助读者建立系统的认识。无论是电子爱好者还是专业工程师，都能从中受益，轻松应对贴片电阻的选型与检测工作。