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What Is The 0805 Resistor?

2025-05-31

0805 resistor is fundamental components use in electrical and electronic circuits. Resistors can limit the current flow, divide voltage, or provide a desired resistance. This surface-mount device (SMD) size is compact, reliable, and suitable for a wide range of applications. From consumer electronics to automotive and industrial circuits.

In this article, we will know key information of the 0805 chip resistor. Its dimensions, resistance values, tolerance, footprint, and power rating. We will also answer some FAQs to help clarify any doubts we might have.

0805 resistor

1. 0805 resistor dimensions

0805 resistor size

L	W	C	D
2.00±0.1	1.20±0.1	0.35±0.25	0.50±0.15

It refers to the physical sizes of the component. The 0805 designation comes from its dimensions in inches.

· Length: 0.08 inches (2.0 mm)

· Width: 0.05 inches (1.25 mm)

· Height: Typically about 0.02 inches (0.5 mm)

In the metric system, it's a compact and relatively small component. This size is extremely efficient in allowing designers to pack a large number of components onto a PCB, while also maintaining low weight and small footprint. The small sizes makes it particularly useful in high-density circuit boards. Such as the PCB in mobile phones, tablets, laptops, and other portable electronic devices.

2. 0805 Resistor Values

Follow the E24 (Standard Values) and E96(Precision Values) standard series. They cover a wide range of values.

Resistance
1Ω	1.02Ω	1.03Ω	1.05Ω	1.06Ω	1.08Ω	1.1Ω
1.12Ω	1.13Ω	1.15Ω	1.16Ω	1.18Ω	1.2Ω	1.22Ω
1.24Ω	1.25Ω	1.26Ω	1.28Ω	1.3Ω	1.32Ω	1.34Ω
1.36Ω	1.37Ω	1.39Ω	1.4Ω	1.42Ω	1.44Ω	1.45Ω
1.47Ω	1.5Ω	1.51Ω	1.53Ω	1.54Ω	1.56Ω	1.57Ω
1.58Ω	1.6Ω	1.62Ω	1.64Ω	1.65Ω	1.67Ω	1.69Ω
1.7Ω	1.72Ω	1.74Ω	1.75Ω	1.77Ω	1.8Ω	1.82Ω
1.83Ω	1.84Ω	1.86Ω	1.88Ω	1.9Ω	1.91Ω	1.92Ω
1.94Ω	1.96Ω	1.98Ω	2Ω	2.02Ω	2.04Ω	2.05Ω
2.06Ω	2.08Ω	2.1Ω	2.12Ω	2.15Ω	2.18Ω	2.2Ω
2.23Ω	2.24Ω	2.26Ω	2.28Ω	2.3Ω	2.32Ω	2.34Ω
2.36Ω	2.37Ω	2.39Ω	2.41Ω	2.43Ω	2.44Ω	2.46Ω
2.49Ω	2.51Ω	2.53Ω	2.55Ω	2.57Ω	2.59Ω	2.61Ω
2.62Ω	2.64Ω	2.67Ω	2.7Ω	2.73Ω	2.75Ω	2.77Ω
2.8Ω	2.82Ω	2.84Ω	2.87Ω	2.9Ω	2.93Ω	2.95Ω
2.97Ω	3Ω	3.02Ω	3.04Ω	3.06Ω	3.09Ω	3.12Ω
3.15Ω	3.18Ω	3.2Ω	3.23Ω	3.26Ω	3.3Ω	3.33Ω
3.36Ω	3.39Ω	3.42Ω	3.45Ω	3.49Ω	3.51Ω	3.54Ω
3.57Ω	3.6Ω	3.63Ω	3.66Ω	3.69Ω	3.74Ω	3.77Ω
3.8Ω	3.83Ω	3.87Ω	3.9Ω	3.94Ω	3.98Ω	4Ω
4.03Ω	4.07Ω	4.1Ω	4.14Ω	4.18Ω	4.22Ω	4.25Ω
4.3Ω	4.34Ω	4.39Ω	4.43Ω	4.47Ω	4.51Ω	4.56Ω
4.7Ω	4.75Ω	4.82Ω	4.87Ω	4.91Ω	4.96Ω	5Ω
5.06Ω	5.1Ω	5.15Ω	5.21Ω	5.26Ω	5.3Ω	5.36Ω
5.43Ω	5.49Ω	5.56Ω	5.62Ω	5.68Ω	5.75Ω	5.82Ω
5.91Ω	6Ω	6.1Ω	6.19Ω	6.28Ω	6.39Ω	6.49Ω
6.56Ω	6.68Ω	6.8Ω	6.92Ω	7Ω	7.12Ω	7.22Ω
7.32Ω	7.47Ω	7.56Ω	7.68Ω	7.87Ω	8Ω	8.12Ω
8.25Ω	8.56Ω	8.68Ω	8.91Ω	9Ω	9.12Ω	9.53Ω
9.76Ω	10Ω	10.2Ω	10.3Ω	10.5Ω	10.7Ω	11Ω
11.3Ω	11.5Ω	12Ω	12.1Ω	12.4Ω	12.7Ω	13Ω
13.3Ω	13.7Ω	14Ω	14.3Ω	14.7Ω	15Ω	15.4Ω
15.7Ω	16Ω	16.3Ω	16.8Ω	17Ω	17.4Ω	17.8Ω
18Ω	18.5Ω	19Ω	19.4Ω	19.6Ω	20Ω	20.5Ω
21Ω	22Ω	22.6Ω	23Ω	24Ω	24.9Ω	25.1Ω
26Ω	27Ω	27.4Ω	28Ω	29Ω	29.4Ω	30Ω

Resistance
	33Ω	36Ω	39Ω	43Ω	47Ω	51Ω
56Ω	62Ω	68Ω	75Ω	82Ω	91Ω	100Ω
110Ω	120Ω	130Ω	150Ω	160Ω	180Ω	200Ω
220Ω	240Ω	270Ω	300Ω	330Ω	360Ω	390Ω
430Ω	470Ω	510Ω	560Ω	620Ω	680Ω	750Ω
820Ω	910Ω	1kΩ	1.1kΩ	1.2kΩ	1.3kΩ	1.5kΩ
1.6kΩ	1.8kΩ	2kΩ	2.2kΩ	2.4kΩ	2.7kΩ	3kΩ
3.3kΩ	3.6kΩ	3.9kΩ	4.3kΩ	4.7kΩ	5.1kΩ	5.6kΩ
6.2kΩ	6.8kΩ	7.5kΩ	8.2kΩ	9.1kΩ	0805 10k resistor	11kΩ
12kΩ	13kΩ	15kΩ	16kΩ	18kΩ	20kΩ	22kΩ
24kΩ	27kΩ	30kΩ	33kΩ	36kΩ	39kΩ	43kΩ
47kΩ	51kΩ	56kΩ	62kΩ	68kΩ	75kΩ	82kΩ
91kΩ	100kΩ	110kΩ	120kΩ	130kΩ	150kΩ	160kΩ
180kΩ	200kΩ	220kΩ	240kΩ	270kΩ	300kΩ	330kΩ
360kΩ	390kΩ	430kΩ	470kΩ	510kΩ	560kΩ	620kΩ
680kΩ	750kΩ	820kΩ	910kΩ	1MΩ	1.1MΩ	1.2MΩ
1.3MΩ	1.5MΩ	1.6MΩ	1.8MΩ	2MΩ	2.2MΩ	2.4MΩ
2.7MΩ	3MΩ	3.3MΩ	3.6MΩ	3.9MΩ	4.3MΩ	4.7MΩ
5.1MΩ	5.6MΩ	6.2MΩ	6.8MΩ	7.5MΩ	8.2MΩ	9.1MΩ
10MΩ	11MΩ	12MΩ	13MΩ	15MΩ	16MΩ	18MΩ
20MΩ	22MΩ	24MΩ	27MΩ	30MΩ	33MΩ	36MΩ
39MΩ	43MΩ	47MΩ	51MΩ	56MΩ	62MΩ	68MΩ
75MΩ	82MΩ	91MΩ	100MΩ	110MΩ	120MΩ	130MΩ
150MΩ	160MΩ	180MΩ	200MΩ	220MΩ	240MΩ	270MΩ
300MΩ	330MΩ	360MΩ	390MΩ	430MΩ	470MΩ	510MΩ
560MΩ	620MΩ	680MΩ	750MΩ	820MΩ	910MΩ	1GΩ
1.1GΩ	1.2GΩ	1.3GΩ	1.5GΩ	1.6GΩ	1.8GΩ	2GΩ

These values can meet various needs in different industries. Depending on the required precision and cost constraints.

3. 0805 Resistors Tolerance

Allowable deviation from the nominal value. It express as a percentage of the resistor's stated value and indicates how much the resistance could vary from the nominal value. The tolerance levels commonly are:

· 5% (E24).

· 2% (E48).

· 1% (E96).

· ±0.01%, ±0.05%, ±0.1%, ±0.25%, ±0.5%, ±30%, Jumper

The tolerance rating is a factor to consider when choosing a resistor for a specific application and precision.

4. 0805 resistor footprint

Recommended Pad Layout

	A	B	C
Size in mm	1.2	3.00	1.30

5. 0805 resistor power rating

It indicates how much electrical power it can safely dissipate without damage or overheat.

· 0.125W (125mW): This is the standard power ratings for 0805 SMD resistors.

0.02W	0.06W	0.1W (1/10W)	0.125W (1/8W)	0.15W
0.175W	0.2W (1/5W)	0.25W (1/4W)	0.26W	0.3W
0.333W (1/3W)	0.4W	0.4W (2/5W)	0.63W (5/8W)	0.66W
0.75W	0.75W (3/4W)	1W	2W	3W
5W	8W	0.5W (1/2W)

We need to choose an appropriate power rating to ensure the resistor operates within safe limits. If the resistor dissipates more power than its rated capacity, it can overheat, leading to failure. When design, must calculate the power dissipation in their circuits using Ohm’s Law (P = V² / R) and select resistors with suitable power ratings.

6.0805 Resistor Markings

The SMD chip resistor usually follow a 3-digit or 4-digit code that represents the resistance value in ohms. Here's how it works:

3-Digit Code:

· First two digits: These represent the first part of the resistance value (the first two significant digits).

· Third digit: This is the multiplier (power of 10) to scale the first two digits.

Example:

· 100 → 10 × 10⁰ = 10 ohms

· 220 → 22 × 10⁰ = 22 ohms

· 470 → 47 × 10⁰ = 47 ohms

· 682 → 68 × 10² = 6,800 ohms or 6.8 kΩ

4-Digit Code (for higher resistance values):

· The first three digits represent the value.

· The last digit is the multiplier.

Example:

· 1001 → 100 × 10¹ = 1,000 ohms or 1 kΩ

· 4701 → 470 × 10¹ = 4,700 ohms or 4.7 kΩ

· 1002 → 100 × 10² = 10,000 ohms or 10 kΩ

FAQs

1. What size is a 0805 resistor?

2.0 mm (length) x 1.25 mm (width). The "0805" designation refers to its size in inches, which translates to 0.08 inches x 0.05 inches.

2. How much power can a 0805 resistor handle?

The normally power rating is 0.125 watts (125 milliwatts). This means that the resistor can safely dissipate up to 125mW of electrical power. Exceeding this rating may result in the resistor overheating, potentially causing it to fail or damage.

3. What is the code for 510 resistor?

51 ohms resistor= 510 markings

This is based on the following:

· The first two digits (51) represent the value 51.

· The third digit (0) is the multiplier, indicating no additional zeros, so it's simply 51 ohms.

In this case, the resistor has a value of 51 ohms and the code would be 510.

For an 0805 resistor, you would likely see this code printed on the resistor's surface for easy identification, along with any tolerance and temperature coefficient marking.

Conclusion

Understanding the dimensions, value, tolerance, footprint, and power rating of the 0805 SMD resistor can help us for selecting the right resistor for any specific application. By considering these factors, we can ensure reliable and efficient circuit performance when design.

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