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Published byAlex Duley Modified over 10 years ago
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Component Symbols & Information Prof. Dr. Moustafa M. Mohamed Vice Dean, Faculty of Allied Medical Science, Pharos University in Alexandria
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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
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Transistors Types Bipolar – NPN (Positive) – PNP (Negative) FETS – J-FET – MOSFET Standard Part Numbers: 2NXX-2NXXXX
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Transistor (cont.) Lead Style/Case Styles 3 terminal devices – TO-3 – TO-5 – TO-92 – TO-220 – I.C. – Surface mount
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Transistor (cont.) Graphic Symbols NPN PNP JFET MOSFET Base Collector Emitter Base Collector Emitter Gate Source Drain Gate Source Drain Reference Designation = Q
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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.
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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
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Integrated Circuits (cont.) Lead Style/Case Styles SIP DIP Pin Grid Array Leadless – Socketed Leadless – Surface Mount
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Integrated Circuits (cont.) Graphic Symbols Reference Designation = U
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Switches Switch - Mechanical or electrical device that closes (makes/connects) or opens (breaks/disconnects) a circuit.
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Switches (cont.) Types SPST SPDT DPDT Note: Poles = Number of connections. Throws = Number of positions
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Switches (cont.) Lever/Mechanism Styles Toggle Slide Pushbutton Rocker Rotary
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Switches (cont.) Lead Style Wire lead Screw Terminal PC Mount Eyelet Surface Mount
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Switches (cont.) Values/Ratings Contacts rated in Amps and Volts Reference designation = S
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Lights/Lamps Used to indicate or signal functions or statuses on equipment. Also used to illuminate meters or gauges.
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Lights/Lamps (cont.) Types Incandescent (filament) Fluorescent (gas) Neon LED
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Lights/Lamps (cont.) Lead Styles Wire lead Screw Terminal PC Mount Eyelet Surface Mount
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Lights/Lamps (Cont.) Graphic Symbols Incandescent LED
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Lights/Lamps (cont.) Values/Ratings Voltage Current Brightness/Luminescence Reference Designation = DS
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