| TYO: 6963 |
|Industry|| Electronics |
|Founded||Kyoto, Japan (September 17, 1958 )|
|Headquarters||21 Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585 Japan|
|Tadanobu Fujiwara, (CEO and President)|
|Revenue||¥ 352,010 million (FY 2017) (¥ 352,369 million) (FY 2016)|
|¥ 31,828 million (FY 2017) (¥ 25,686 million) (FY 2016)|
|¥ 26,450 million (FY 2017) (¥ 25,702 million) (FY 2016)|
|Total assets||¥ 834,503 million (FY 2017) (¥ 804,134 million) (FY 2016)|
|Total equity||¥ 725,453 million (FY 2017) (¥ 706,251 million) (FY 2016)|
Number of employees
|21,308 (as of March 31, 2017)|
Rohm Semiconductor (ローム株式会社, Rōmu Kabushiki-gaisha) (styled as ROHM) is a Japanese electronic parts manufacturer based in Kyoto, Japan. Rohm was incorporated as Toyo Electronics Industry Corporation by Kenichiro Sato (佐藤 研一郎) on September 17, 1958.
The company was originally called R.ohm,[ citation needed ] which was derived from R for resistors, the original product, plus ohm, the unit of measure for resistance.
The name of the company was officially changed to Rohm in 1979 and then changed again to Rohm Semiconductor in January 2009.
When Rohm was established, resistors were its main product. Later, the company began manufacturing semiconductors. ICs and discrete semiconductors now account for about 80% of Rohm's revenue.
Through 2012, Rohm was among the top 20 semiconductor sales leaders.
An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume. The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire. In semiconductors they can be electrons or holes. In a electrolyte the charge carriers are ions, while in plasma, an ionized gas, they are ions and electrons.
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses. High-power resistors that can dissipate many watts of electrical power as heat, may be used as part of motor controls, in power distribution systems, or as test loads for generators. Fixed resistors have resistances that only change slightly with temperature, time or operating voltage. Variable resistors can be used to adjust circuit elements, or as sensing devices for heat, light, humidity, force, or chemical activity.
A PIN diode is a diode with a wide, undoped intrinsic semiconductor region between a p-type semiconductor and an n-type semiconductor region. The p-type and n-type regions are typically heavily doped because they are used for ohmic contacts.
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship:
In electronics and electromagnetism, the electrical resistance of an object is a measure of its opposition to the flow of electric current. The reciprocal quantity is electrical conductance, and is the ease with which an electric current passes. Electrical resistance shares some conceptual parallels with the notion of mechanical friction. The SI unit of electrical resistance is the ohm, while electrical conductance is measured in siemens (S).
Renesas Electronics Corporation is a Japanese semiconductor manufacturer headquartered in Tokyo, Japan, initially incorporated in 2002 as Renesas Technology, the consolidated entity of the semiconductor units of Hitachi and Mitsubishi excluding their dynamic random-access memory businesses, to which NEC Electronics merged in 2010, resulting in a minor change in the corporate name and logo to as it is now.
The 555 timer IC is an integrated circuit (chip) used in a variety of timer, delay, pulse generation, and oscillator applications. Derivatives provide two (556) or four (558) timing circuits in one package. It was commercialized in 1972 by Signetics. Numerous companies have made the original bipolar timers and similar low-power CMOS timers too. In 2017, it was said over a billion 555 timers are produced annually by some estimates, and "probably the most popular integrated circuit ever made."
Voltage drop is the decrease of electrical potential along the path of a current flowing in an electrical circuit. Voltage drops in the internal resistance of the source, across conductors, across contacts, and across connectors are undesirable because some of the energy supplied is dissipated. The voltage drop across the electrical load is proportional to the power available to be converted in that load to some other useful form of energy.
The piezoresistive effect is a change in the electrical resistivity of a semiconductor or metal when mechanical strain is applied. In contrast to the piezoelectric effect, the piezoresistive effect causes a change only in electrical resistance, not in electric potential.
In electronics, an LED circuit or LED driver is an electrical circuit used to power a light-emitting diode (LED). The circuit must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED. The voltage drop across an LED is approximately constant over a wide range of operating current; therefore, a small increase in applied voltage greatly increases the current. Very simple circuits are used for low-power indicator LEDs. More complex, current source circuits are required when driving high-power LEDs for illumination to achieve correct current regulation.
A zero-ohm link or zero-ohm resistor is a wire link packaged in the same physical package format as a resistor. It is used to connect traces on a printed circuit board. This format allows it to be placed on the circuit board using the same automated equipment used to place other resistors, instead of requiring a separate machine to install a jumper or other wire. Zero-ohm resistors may be packaged like cylindrical resistors, or like surface-mount resistors.
Vishay Intertechnology, Inc. is an American manufacturer of discrete semiconductors and passive electronic components founded by Polish-born businessman Felix Zandman. Vishay has manufacturing plants in Israel, Asia, Europe, and the Americas where it produces rectifiers, diodes, MOSFETs, optoelectronics, selected integrated circuits, resistors, capacitors, and inductors. Vishay Intertechnology revenues for 2018 were $3.035 billion. As of December 31, 2018, Vishay Intertechnology had approximately 24,100 full-time employees.
Shin-Etsu Chemical Co., Ltd. is the largest chemical company in Japan, ranked No. 9 in Forbes Global 2000 for chemical sector. Shin-Etsu has the largest global market share for polyvinyl chloride, semiconductor silicon, and photomask substrates.
Furukawa Electric Co., Ltd. is a Japanese electric and electronics equipment company.
America II Electronics is a distributor of electronic components based in St. Petersburg, Florida.
The following outline is provided as an overview of and topical guide to electronics:
Dainippon Screen Mfg. Co., Ltd. (大日本スクリーン製造株式会社) is a Japanese semiconductor and electronics company, headquartered in Kyoto, engaged in the manufacture and sale of equipment for the manufacturing of semiconductors, flat panel displays, storage media and precision technology manufacturing equipment.
Shindengen Electric Manufacturing is a Japanese, Tokyo-based company, manufacturing power semiconductor devices, electric power systems, automotive electronics products and solenoid products. It is listed on the Tokyo Stock Exchange and the company's largest shareholder is Honda.
Exar Corporation is an American semiconductor manufacturer which was acquired by MaxLinear in May 2017 and maintained as a wholly owned subsidiary. It was established in 1971 as a subsidiary of the Japanese firm Rohm.
A voltage-controlled resistor (VCR) is a three-terminal active device with one input port and two output ports. The input-port voltage controls the value of the resistor between the output ports. VCRs are most often built with field-effect transistors (FETs). Two types of FETs are often used: the JFET and the MOSFET. There are both floating voltage-controlled resistors and grounded voltage-controlled resistors. Floating VCRs can be placed between two passive or active components. Grounded VCRs, the more common and less complicated design, require that one port of the voltage-controlled resistor be grounded.