A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Strictly speaking, a semiconductor is a material with an electrical conductivity between that of an insulator and that of a conductor. Semiconductors can be single elements such as silicon or germanium or compounds such as gallium arsenide or indium phosphide. In day to day usage, however, the term "semiconductor" more frequently refers to the components manufactured from semiconductor materials.
- µ
micron - see letter M in the glossary
- 235U
Uranium-235
- 238U
Uranium-238
- U
Uranium
- UAI
Use As Is
- UAQI
Uniform Air Quality Index
- UART
Universal Asynchronous Receiver Transmitter
- UCL
Upper Control Limit
- UCR
Unit Carcinogenic Risk
- UDCS
Unified Document Control System
(and ADCS: Advanced Document Control System) Information System used to create, modify, validate, store and distribute the company official documents such as product specifications, purchasing specifications, customer specific specifications, SOP, design rules. ADCS is the new software tool generation which replaced UDCS.
- UEL
Upper Explosive Limit
- UF
Uncertainty Factor
- UFBGA
Ultra thin Fine pitch Ball Grid Array
Total height 1.0 max.
- UFL
Upper Flammable Limit
- UHF
Ultra High Frequency
- UID
1) U-Interface Device
2) Unique Identification Device
- UK
United Kingdom
- UKASS
UK Association of Suggestions Scheme
- UL
Underwriters Laboratories
- ULAS
Uncommitted Logic Array
- ULR
Uniform Resource Locator
- ULSI
Ultra Large Scale Integration
An IC containing 10,000+ circuits.
- Ultrasonic Bonding
A wire bonding technique that utilizes ultrasonic energy and pressure to form the bond, without heat.
- UN/NA number
United Nations/North America number
- UN/EDIFACT
Electronic Data Interchange for Administration, Commerce and Transport
- Undercut
The lateral etching that occurs as the etching proceeds vertically.
- UNEP
United Nations Environment Program
- UNI
User Network Interface
- Unipolar
Refers to FET devices where current passes only through one type of semiconductor material (P or N) as it flows from input to output.UNSCH
UNSCHeduled
Orders for which a confirmed date has not been given to the customer.
- uP
Microprocessor
- UPC
Universal Product Code
- UPH
Units Per Hour
Number of defect-free parts produced per hour worked.
- UPS
Uninterruptable Power Supply
A power supply with backup batteries or standby generator and an automatic controller that ensures continuous supply even when the main power feed is interrupted.
- Uranium (U)
A rare heavy metal with an atomic number of 92. The most common atomic weight in naturally occurring uranium is 238. Other isotopes range from 234 to 239. Uranium is found in natural deposits in several parts of the world, principally as the oxide. The element was little used until about 1942 when it was discovered that Uranium-235 (the uranium isotope with an atomic weight of 235), which is present in natural uranium deposits at levels of 0.7%, could be employed as a fission fuel for the construction of nuclear reactors and weapons. This discovery led to todayis nuclear armaments and the nuclear industry.
- URCLK
Universal Transmitter Clock
- URL
Uniform Resource Locator
A naming convention that uniquely identifies the location of a computer, directory, or file on the Internet. The URL also specifies the appropriate Internet protocol, such as HTTP, and so on.
- URT
Upper Respiratory Tract
- USART
Universal Synchronous/Asynchronous Receiver/Transmitter
- USB
Universal Serial Bus
- USDW
Underground Source of Drinking Water
- UST
Underground Storage Tank
ST has defined an underground storage tank as a single-walled tank which is buried directly in the ground. UST's are a common source of contamination of soil because their contents leak out. The wall of UST's can corrode (because they are partially located below the water table, or the materials in the tanks are incompatible with the materials with which the tank is made, or there are stray electric currents in the ground, or for some other reason), or they can be crushed and opened at joints with pipes etc. (because, e.g., they are placed under a road over which pass heavy lorries), or it can simply be an issue of incorrect filling or emptying practices (overfilling, unhooking of filling pipes which are still filled with liquids, etc.). The risks of uncontrolled leaks can be minimized by using tanks with double walls, by installing them in vaults which can be inspected or in which can be inserted leak detection systems, by installing overfill controls, by monitoring them regularly for leaks, etc.
- Up time
The time that a piece of equipment is working - the opposite of down time.
- UTC
1)Universal Time Code
2) Universal Time Coordinated
An international, highly accurate and stable uniform atomic time system.
- UTIL
Utility
- UUENCODE
Unix to Unix Encoding
- UV
Ultra Violet
- UV-A
Ultraviolet radiation-A (Alpha)range
- UV-B
Ultraviolet radiation-B (Besta) range
- UV-C
Ultraviolet radiation-C range
- UVLD
UltraViolet Lockout Device
- UVLO
Under Voltage LockOut
- UV-VAS
Ultraviolet - Visible Absorption Spectrum
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