## Technical Overview: CM453232-R33ML The **CM453232-R33ML** is a high-performance **Wire-Wound Chip Inductor** (SMD Inductor) manufactured by Bourns. It is part of the CM453232 series, designed for general-purpose electronic applications requiring high reliability and stability. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: | Code Segment | Meaning | Specification | |:---|:---|:---| | **CM** | Series Name | Chip Inductor (Wire-wound) | | **453232** | Case Size (Metric) | 4.5 x 3.2 x 3.2 mm (approx. 1812 Imperial) | | **R33** | Inductance Value | 0.33 µH (Microhenries) | | **M** | Tolerance | ±20% | | **L** | Termination | Lead-free (RoHS Compliant) | --- ### 2. Key Technical Specifications Below are the primary electrical and physical parameters for this component: | Parameter | Value | |:---|:---| | **Inductance** | 0.33 µH | | **Tolerance** | ±20% | | **Q-Factor (Min)** | 30 (@ 25.2 MHz) | | **SRF (Self-Resonant Frequency)** | 350 MHz (Minimum) | | **DCR (DC Resistance)** | 0.40 Ohms (Maximum) | | **Rated Current (Idc)** | 450 mA | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Construction and Materials The CM453232 series utilizes a specific build style to balance performance and size: * **Core Material:** Ferrite or Non-magnetic (depending on value; typically Ferrite for R33). * **Wire:** Enameled copper wire wound around the core. * **Encapsulation:** Epoxy resin molded body for environmental protection and mechanical strength. * **Terminations:** Tin-plated (Sn) over Nickel (Ni) barrier. --- ### 4. Common Applications Due to its 1812 footprint and current handling, it is commonly used in: * **Power Supplies:** Filtering and decoupling in DC-DC converters. * **Communication Equipment:** Signal conditioning and impedance matching. * **Automotive Electronics:** General-purpose noise suppression (non-safety critical). * **Consumer Electronics:** TV, Video, and Audio equipment. --- ### 5. Footprint (Land Pattern) When designing a PCB for this part, use the following approximate dimensions: ```text Recommended Pad Layout: Length: 5.0 mm Width: 3.0 mm Gap: 2.0 mm ```