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Component Symbols & Information

Component Symbols & Information. Prof. Dr. Moustafa M. Mohamed Vice Dean, Faculty of Allied Medical Science, Pharos University in Alexandria. Transistors. Transistors – Semiconductor component used for switching and amplification. Works as a transfer resistance device. Values in

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Component Symbols & Information

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  1. Component Symbols&Information Prof. Dr. Moustafa M. Mohamed Vice Dean, Faculty of Allied Medical Science, Pharos University in Alexandria

  2. Transistors • Transistors – Semiconductor component used for switching and amplification. Works as a transfer resistance device. • Values in • Voltage and current ratings • Maximum amplification factors (BETA) • Frequency range • Input Resistance • Output Resistance

  3. TransistorsTypes • Bipolar • NPN (Positive) • PNP (Negative) • FETS • J-FET • MOSFET • Standard Part Numbers: 2NXX-2NXXXX

  4. Transistor (cont.)Lead Style/Case Styles • 3 terminal devices • TO-3 • TO-5 • TO-92 • TO-220 • I.C. • Surface mount

  5. Collector Collector Base Base Emitter Emitter Drain Drain Gate Gate Source Source Transistor (cont.)Graphic Symbols • NPN • PNP • JFET • MOSFET • Reference Designation = Q

  6. Integrated Circuits • Integrated Circuits – Complete circuits manufactured using semiconductor materials integrated on a single piece of silicon (known as chips). • Applications include: • Analog (amplifiers) • Digital (computers, logic devices, tuners) • Values rated in voltage and current requirements/ limits for inputs and outputs.

  7. Integrated Circuits (cont.)Types • Analog – Amplifiers and regulators • Digital – Counters, flip-flops, gates, computers, tuners, and filters • TTL = Transistors, transistor logic, 5 V • CMOS = Complimentary Metal Oxide Semiconductor, 12 V

  8. Integrated Circuits (cont.)Lead Style/Case Styles • SIP • DIP • Pin Grid Array • Leadless – Socketed • Leadless – Surface Mount

  9. Integrated Circuits (cont.)Graphic Symbols • Reference Designation = U

  10. Switches • Switch - Mechanical or electrical device that closes (makes/connects) or opens (breaks/disconnects) a circuit.

  11. Switches (cont.)Types • SPST • SPDT • DPDT • Note:Poles = Number of connections. Throws = Number of positions

  12. Switches (cont.)Lever/Mechanism Styles • Toggle • Slide • Pushbutton • Rocker • Rotary

  13. Switches (cont.)Lead Style • Wire lead • Screw Terminal • PC Mount • Eyelet • Surface Mount

  14. Switches (cont.)Values/Ratings • Contacts rated in Amps and Volts • Reference designation = S

  15. Lights/Lamps • Used to indicate or signal functions or statuses on equipment. • Also used to illuminate meters or gauges.

  16. Lights/Lamps (cont.)Types • Incandescent (filament) • Fluorescent (gas) • Neon • LED

  17. Lights/Lamps (cont.)Lead Styles • Wire lead • Screw Terminal • PC Mount • Eyelet • Surface Mount

  18. Lights/Lamps (Cont.)Graphic Symbols • Incandescent • LED

  19. Lights/Lamps (cont.)Values/Ratings • Voltage • Current • Brightness/Luminescence • Reference Designation = DS

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