Surface-mount fixed inductors for electronic circuits
Manufacturer： bourns
# Introduction to the SDR1005 - 222JL Product Series
## 1. Overview
The SDR1005 - 222JL product series belongs to the realm of electronic components, specifically surface - mount inductors. These inductors play a crucial role in a wide range of electronic circuits, serving functions such as filtering, energy storage, and impedance matching. With their compact size and high - performance characteristics, they are well - suited for modern electronic devices that demand miniaturization and reliability.
## 2. Product Naming Convention
- **SDR**: This is the product series code, which is unique to the manufacturer and represents a specific family of inductors with certain design and performance features.
- **1005**: It indicates the physical dimensions of the inductor. In the metric system, 1005 corresponds to a size of 1.0mm x 0.5mm. This small form factor makes it ideal for use in densely populated printed circuit boards (PCBs), such as those found in mobile phones, wearables, and other portable electronic devices.
- **222**: This is the inductance value code. Using the standard inductor value coding system, the first two digits (22) are the significant figures, and the third digit (2) is the multiplier. So, the inductance value is \(22\times10^{2}\) nH, which equals 2200 nH or 2.2 μH.
- **J**: The letter 'J' represents the tolerance of the inductor. In this case, it indicates a tolerance of ±5%. This means that the actual inductance value of the SDR1005 - 222JL inductor can vary within 5% of the nominal value of 2.2 μH.
- **L**: The 'L' might be a specific code related to additional features, manufacturing batch, or a particular version within the SDR1005 - 222J product line, as defined by the manufacturer.
## 3. Electrical Characteristics
### Inductance
As mentioned earlier, the nominal inductance of the SDR1005 - 222JL is 2.2 μH with a tolerance of ±5%. This inductance value is carefully calibrated during the manufacturing process to ensure consistent performance in different applications. The inductance is measured at a specific frequency, typically around 100 kHz, which is a common operating frequency in many electronic circuits.
### DC Resistance (DCR)
The DC resistance of the inductor is an important parameter as it affects the power loss and efficiency of the circuit. The SDR1005 - 222JL has a relatively low DC resistance, which helps to minimize power dissipation in the form of heat. A lower DCR also means that the inductor can handle higher currents without significant voltage drops, making it suitable for power - related applications.
### Saturation Current (Isat)
The saturation current is the maximum DC current that can flow through the inductor before its inductance value drops by a specified amount (usually 10% or 20%). For the SDR1005 - 222JL, it has a well - defined saturation current rating. This rating is crucial in power supply circuits, where the inductor needs to maintain its inductance value even when large currents are flowing. If the current exceeds the saturation current, the inductance will decrease, which can lead to instability in the circuit and affect its performance.
### Self - Resonant Frequency (SRF)
The self - resonant frequency is the frequency at which the inductor's inductive reactance and capacitive reactance are equal. Above the SRF, the in