1. Suppress the bias of magnetic material density to prevent the formation of cracks inside the product.
Sealing with a metal composite material requires that the metal composite material maintain a homogeneous density during molding to prevent crack formation in the product. However, downsizing a product makes it difficult to achieve a homogeneous density, and leads to a case where, after the molding, voids are formed between metal magnetic material particles, which cause a crack. To deal with this problem, the company has developed a metal composite material for insulating magnetic powder and sealing the metal magnetic material, by devising a special resin added to the metal. This metal composite material is melted and injected into the coil to fill it thoroughly. Therefore, the company has achieved a small power inductor that suppresses crack formation in the product.
2. A connection with a redundant design between a built-in coil and a terminal improves the connection reliability.
A built-in coil has leads at both the start and end of windings, and these leads are electrically connected to a terminal inside the product. Currently, all leads have a redundant design that enables multiple connections, which prevents the occurrence of connection failures. In addition, each lead is welded to a part of the terminal in a structure where it is held in the terminal (caulking structure), which improves the connection reliability.
3. CO2 emissions during the manufacturing process are 50% less than in conventional cases (CO2 emissions/piece)
Due to its smaller size than conventional ones, the product requires finer processing and assembly, resulting in a problem whereby the conventional manufacturing process needs a greater amount of power to manufacture the product. To deal with this problem, Panasonic has changed the processing method by reducing heat treatments, thereby allowing simultaneous microfabrication and high-speed processing. This has led to a significant improvement in the productivity of the production process. As a result, CO2 emissions during the manufacturing process are now 50% less than in conventional cases (CO2 emissions/unit).
|Product number ||Shape |
|DC resistance |
|ETQP2MR22PGR ||4.45x4.06x2.0 ||0.22 uH ||7.7 mΩ ||8.3 A |
|ETQP2M2R2PGR ||2.2 uH ||54 mΩ ||3.2 A |
- (*1): Measured at 100 kHz. (*2): Current value that causes a temperature rise of 40degrees.
The company is planning to expand the inductance range of the power inductor to meet market needs.
 Power inductor
An electronic component used in DC/DC converters, etc. Functions as a filter that accumulates energy or eliminates noise.
 Metal composite material
A magnetic material made by insulating the powder of metal magnetic material (iron group) in which powder based on metallic magnetic material with resin.
 Redundant design
A design concept whereby backup means are provided for a part that must be highly reliable so that a problem with it does not develop into a major issue. A redundant design allows a product to maintain its normal functions and safety.
This is one of the indexes indicating the capability of a coil. A changing current flowing through a coil creates a voltage that generates a current flow for offsetting the changing current. The degree of creation of this voltage is referred to as inductance.
 DC resistance
DC resistance is a resistance component of winding (copper wire). The lower the DC resistance, the lower the power loss. Thereby yielding an improvement in power efficiency.
Panasonic Corporation Corporate PR Center
For product inquiries, contact:
Device Solutions Business Division, Industry Company
Detailed product Information:
Small Power Choke Coil of 4 mm by 4 mm Square for Automotive Use
Industry Company, Panasonic Corporation website:
Panasonic Corporation is a global leader developing innovative technologies and solutions for wide-ranging applications in the consumer electronics, housing, automotive, and B2B sectors. The company, which celebrated its 100th anniversary in 2018, operates 522 subsidiaries and 69 associated companies worldwide and reported consolidated net sales of 6,698.8 billion yen for the year ended March 31, 2021. Committed to pursuing new value through collaborative innovation, the company uses its technologies to create a better life and a better world for customers. Learn more about Panasonic: https://www.panasonic.com/global.