TCT Series of bottom electrode tantalum capacitors

Overview | Key Feature1 | Key Feature2 | Key Feature3 | Key Feature4 | Applications | Lineup

TCT Series Bottom electrode configuration enables a larger capacitance in a smaller form factor


The increasingly higher performance and greater miniaturization of portable electronic equipment such as smart phones and electronic dictionaries demand thinner, more compact components. To meet these demands, ROHM offers the TCT Series of tantalum capacitors that utilize a special bottom electrode configuration for larger capacitance in a smaller, lower profile form factor. 7 package types are available, from the (0402in) U Case with a maximum capacitance of 470µF to the larger (2412in) CL Case.
In addition, ROHM's tantalum capacitors are strong against board stresses (i.e. flexing) and feature stable capacitance characteristics, making them the ideal replacement for ceramic capacitors.

Key Feature 1 : Large capacitance in a compact, low-profile package

  • Compact, large capacitance

The bottom electrode design makes a larger capacitance possible in a smaller form factor (vs. conventional types)

Large element integrated into a low-profile package
  • Low-Profile Lineup (t=1mm max.)

The PL Case (Low-profile 0805in) and AS Case (Low-profile 1206in) feature a height of only 0.9mm

TCTPL Series, TCTAS Series

Key Feature 2 : Bottom electrode structure

Ceramic capacitors feature 5 electrode surfaces, increasing the possibility of short-circuits between the board wiring and electrodes. In order to prevent this a certain amount of space is required between the top and bottom of the board. In contrast, ROHM's tantalum capacitors feature a bottom electrode configuration that eliminates short-circuits and the need for spacing required by ceramic capacitors - contributing to thinner sets.

Bottom electrode structure

Key Feature 3 : Strong against board stress

ROHM tantalum capacitors are more than 4 times stronger against board stress (flexing) than ceramic capacitors, making it possible to mount in areas subjected to excessive board flex.
This not only increases design freedom, but ensures smooth operation during the manufacturing phase while contributing to greater compactness and reduced costs.

Test Conditions
Board Flex Test Results

Key Feature 4 : Stable capacitance characteristics

ROHM tantalum capacitors feature stable capacitance even during temperature or voltage changes.

Capacitance Characteristics: Tantalum vs. Ceramic Capacitors


Mobile phones, smart phones, electronic dictionaries, digital cameras, digital video cameras, portable audio, handheld gaming equipment, and more


TCTCL Series (CL Case) 470µF Max. TCTAL Series (AL Case) 330µF Max.
Low-profile 3216 Size (3.2 to 1.6 to 1.1)
TCTPL Series (PL Case) 150µF Max. TCTPL Series (PL Case) 150µF Max.
Low-profile 2012 Size (2.0 to 1.25 to 0.9)
TCTAL Series (AL Case) 330µF Max. TCTAS Series (AS Case) 220µF Max.
Low-profile 3216 Size (3.2 to 1.6 to 0.9)
TCM Series (M Case) 47µF Max. TCM Series (M Case) 47µF Max.
1608 Size (1.6 to 0.85 to 0.8)
TCTAS Series (AS Case) 220µF Max. TCTP Series (P Case) 220µF Max.
Low-profile 2012 Size (2.0 to 1.25 to 1.1)
TCTU Series (U Case) 15µF Max. TCTU Series (U Case) 15µF Max.
1005 Size (1.0 to 0.5 to 0.6)


ROHM utilizes the most advanced technologies and processes to develop products that meet the needs of current and next-generation devices.

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