ER1840-37JM

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Fixed inductors are components that store energy in an electromagnetic field and release this energy to the circuit. The most common types of fixed inductors are air core inductors, ferrite core inductors, and pot core inductors. The ER1840-37JM is a 3.3 μH pot core inductor from Eaton Corporation. It is designed for applications such as DC-DC converters, switching regulators, synchronous rectification, and hard drive and power supply filtering.

The ER1840-37JM is constructed using a magnetic pot core made from a high-saturation permeability ferrite that encases a single spiral-wound copper wire. The external shell of the pot core is made of a thermoplastic material that provides a high degree of electrical and mechanical protection for the coil. The inductor is RoHS compliant, and to reduce EMI interference it features a built-in magnetic shield.

The coil has an inductance of 3.3 μH and is rated up to 1.0 A. Depending on the application it can operate at a temperature range of -40°C to 125°C, and is capable of withstanding short-duration peak currents from 1.43 A to 1.86 A. Due to its low DC resistance the ER1840-37JM is well-suited for use as a power supply filter or as a current-limiter in DC-DC converters.

In a DC-DC converter the ER1840-37JM creates an AC current when a voltage is applied to the inductor, which is then converted to a DC current by a rectifier. This process is known as synchronous rectification. The inductor stores energy as it builds up a magnetic field, and when the magnetic field is released, it creates an electrical current to the load. this process is similar to the operation of a flyback transformer.

The ER1840-37JM is designed to meet stringent reliability requirements and is rated to last for 100,000 hours at full load. The component is lead free and meets the RoHS requirements. It is available in standard sizes and packages, making it easy to integrate into existing designs.

In summary, the ER1840-37JM is a 3.3 μH pot core inductor from Eaton Corporation designed for use in DC-DC converters, switching regulators, synchronous rectification, and power supply filtering applications. The inductor is RoHS compliant and has an inductance of 3.3 μH and is rated up to 1.0 A. It is lead free and designed to meet stringent reliability requirements and is rated to last for 100,000 hours at full load.

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