RN73R2ATTD1381F100 vs RN73R2ATTD1233D50
| Part Number |
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| Category | Chip Resistor - Surface Mount | Chip Resistor - Surface Mount |
| Manufacturer | KOA Speer Electronics, Inc. | KOA Speer Electronics, Inc. |
| Description | RES 1.38K OHM 1% 1/8W 0805 | RES 123K OHM 0.5% 1/8W 0805 |
| Package | Tape & Reel (TR) | -Reel® |
| Series | RN73R | RN73R |
| Features | Automotive AEC-Q200, Moisture Resistant | Automotive AEC-Q200, Moisture Resistant |
| Operating Temperature | -55°C ~ 155°C | -55°C ~ 155°C |
| Package / Case | 0805 (2012 Metric) | 0805 (2012 Metric) |
| Supplier Device Package | 0805 | 0805 |
| Tolerance | ±1% | ±0.5% |
| Temperature Coefficient | ±100ppm/°C | ±50ppm/°C |
| Size / Dimension | 0.079" L x 0.049" W (2.00mm x 1.25mm) | 0.079" L x 0.049" W (2.00mm x 1.25mm) |
| Power (Watts) | 0.125W, 1/8W | 0.125W, 1/8W |
| Ratings | AEC-Q200 | AEC-Q200 |
| Height - Seated (Max) | 0.024\" (0.60mm) | 0.024\" (0.60mm) |
| Failure Rate | - | - |
| Resistance | 1.38 kOhms | 123 kOhms |
| Composition | Thin Film | Thin Film |
| Number of Terminations | 2 | 2 |
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1. Working principle of chip fixed resistors
The working principle of chip fixed resistors is based on Ohm's law, that is, the relationship between voltage (V), current (I) and resistance (R) is V=I×R. This resistor is a two-terminal passive component used to implement resistance like a circuit element. The current flowing through the resistor is proportional to the voltage across the resistor. Therefore, this relationship can be simply expressed using Ohm's law. For example, if a 100-ohm resistor is connected across a potential difference of 10 volts, a current of 0.1 amperes flows through the resistor.
Chip fixed resistors, commonly known as chip resistors, are one type of metal glass uranium resistors. It is a resistor made by mixing metal powder and glass uranium powder and printing it on a substrate using screen printing. This resistor is resistant to moisture and high temperature and has a small temperature coefficient. Its manufacturing process includes mixing metal powder and glass uranium powder, and then printing these mixtures on a substrate by screen printing to form the desired resistance value. This design enables chip fixed resistors to work stably in various environments, including humid and high temperature conditions, while maintaining a small temperature coefficient to ensure the stability of the resistance value. -
2. Resistance value representation method
In the digital identification of chip resistors, the first three digits are usually used to indicate the resistance value. These digits are interpreted in decimal, such as "100" means the resistance value is 100 ohms. In some cases, if the resistor value is large, "R" may be used to indicate the decimal point position, such as "1R0" for a resistor value of 1.0 ohm.
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3. Resistor tolerance accuracy representation method
The tolerance accuracy of chip resistors refers to the allowable deviation range between the actual value of the resistor and the nominal value. In the digital identification, the tolerance accuracy is usually indicated by the last one or two digits. These numbers correspond to different accuracy levels, for example, 1% accuracy is usually indicated by the number "1", while 0.1% accuracy is indicated by the number "01".
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4. Chip Resistor package power relationship
Formula
Current = (rated power / resistance) square root
Power P = U2 / R
Package Rated power 70°C Maximum operating voltage (V) Imperial (inch) Metric (mm)
0201 0603 1/20W / 25
0402 1005 1/16W / 50
0603 1608 1/16W 1/10W 50
0805 2012 1/10W 1/8W 150
1206 3216 1/8W 1/4W 200
1210 3225 1/4W 1/3W 200
1812 4832 1/2W / 200
2010 5025 1/2W 3/4W 200
2512 6432 1W / 200
