Sites:
Home > Technical Library

Plessey / MSI Bar Code

 

The Plessey bar code is a pulse-width, modulated, non-self checking code. Each character consists of eight elements: four bars and four spaces. The character set includes the digits 0 through 9 and the upper case letters A through F. Plessey bar codes are used primarily in libraries. The MSI Plessey bar code is a variant of the Plessey barcode that is used primarily in store shelf labeling. A Modulo 10 checksum is appended to the end of the code.

Products & Services
Ink Jet Printers
Ink jet printers project electrically charged droplets of ink onto a page. Types of ink jet printers include thermal and piezo.
Tunnel Diodes
Tunnel diodes are heavily doped P-N diodes in which electron tunneling from the conduction band in the N-type material to the valence band in the P-type region produces a region of negative resistance. This negative-resistance region is the most important area of operation. As the voltage is increased, the current decreases. This feature makes tunneling diodes especially useful in oscillators and radio frequency (RF) applications.
Schottky Diodes
Schottky diodes in their simplest form consist of a metal layer that contacts a semiconductor element. The metal / semiconductor junctions exhibit rectifying behavior (i.e., the current passes through the structure more readily with one polarity than the other).
RF Diodes
RF diodes are designed to handle high-power radio frequency (RF) signals in stereo amplifiers, radio transmitters, television monitors, and other RF or microwave devices.
Product Announcements
American Microsemiconductor, Inc. - Tunnel Diode and Back Diode by AMS
American Microsemiconductor supplies a wide range of tunnel diodes. Tunnel diodes have a negative resistance region that allows for very fast switching speeds, up to 10 GHz. (read more)
American Microsemiconductor, Inc. - Diodes, Rectifiers, General Purpose Diodes Arrays
Diodes, Rectifiers, Diode Arrays, General Purpose Diodes, High-speed Diodes, Varistors and more from American Microsemiconductor, Inc. With over 17,000,000 electronic components sitting on our... (read more)
American Microsemiconductor, Inc. - Tunnel Diodes from American Microsemiconductor
Tunnel Diodes from American Microsemiconductor Inc. WE have an extensive product line of tunnel/Esaki diodes.These fast switching diodes are ideal as microwave signal generators,detectors, etc. (read more)
Comchip Technology Corporation - Forward Current up 50% in Schottky Diodes
Comchip Technology has developed surface mounted Schottky barrier rectifiers with a maximum forward rectified current of 3.0A, utilizing the SOD-123T / Mini SMA package... (read more)
Comchip Technology Corporation - New 40% Thinner SOD-123 Chip Package: SOD-123H
Comchip has developed a new version of the popular diodes SOD-123 chip package... (read more)
Comchip Technology Corporation - SMD Switching Diode - Halogen Free
These high-speed small-signal switching diodes, for switching digital signal applications, come in the compact chip package: 0603 (SOD-523). This package offers PCB real estate savings, is easy to... (read more)
Comchip Technology Corporation - SMD Switching Diode - Halogen Free
One of Comchip's most popular items listed on their distributor's websites is the switching diode: CDSU4148. Comchip has released part number: CDSU4148-HF. The "-HF" denotes Halogen Free. Helping to... (read more)
Comchip’s CDBMT Schottky barrier rectifier series utilizes the low profile flat chip SOD-123H (MINI SMA) package. (read more)
American Microsemiconductor, Inc. - Diode Arrays
Fast switching Diode Arrays American Microsemiconductor diode arrays, featuring 10nS reverse recovery time and a low foward voltage drop of 1.0max volt at 10 mA, make them ideal where ESD and EFT... (read more)
 
Topics of Interest

In electronics, a diode is a component that restricts the direction of movement of charge carriers. Essentially, it allows an electric current to flow in one direction, but blocks it in the opposite...

Besides the PN diodes that we studied in the last experiment there are many more types of diodes.  Each one is used in applications that can take advantage of its behavior and...

A semiconductor diode is a non-linear device whose most outstanding feature is the fact that current is allowed to flow – basically – in one direction only.  The diode is built by...

Diodes Semiconductor diodes can use two basic forms of construction, point-contact or junction. Point-contact diodes are still available and used for small-signal purposes where a low value of...

QINGMIN LIU, SURAJIT SUTAR, AND ALAN SEABAUGH Department of Electrical Engineering, University of Notre Dame Notre Dame, IN 46556, USA A new tunnel diode/transistor circuit topology is reported,...