Before starting this material, we will look at some Surface Mount content posted in Week #13 of EET-255.
There are two videos on our Blackboard area for you to watch. Make sure you view both videos. They support the content below.
Here's information about the Complete Resistor Color Code. Your experience has probably mostly been with what are known as 4-band resistors (2 significant digit bands, 1 multiplier band & 1 tolerance band) These were typically used for resistors which had either 20%, 10% or 5% tolerances.
There are other color banding schemes that are in use with which you should be familiar. There are 3 band resistors (2 significant digit bands & 1 multiplier band, tolerance was 20%). These are not too common any more, but you may see them if you ever look at vintage circuits from the 1960's and before.
More commonly now are "precision resistors" with tolerances of 2%, 1%, 0.5%, 0.25%, 0.1% and even 0.05%. In order to be able to specify the required significant digits for these types of resistors, additional color bands are added. Here's a chart which shows how the color code adapts to the various tolerance resistors:
Here's a bit about Resistor Temperature Coefficients.
The "E-Series" designation is used for each tolerance specification. The number after the "E-" specifies how many different component values exist within each decade of range. For example, E-3 only has 3 values per decade: 1, 2.2, 4.7, typically used either when exact values don't really matter (such as pull-up/pull-down resistors) or back when component manufacturing tolerances were about 50%. More common is E-12 for 10% tolerance and E-24 used for 5% tolerance. See the chart below.
The banded color code scheme worked well, especially back in the days before printed circuit boards were used and the wiring was point-to-point. The bands allowed an assembly/technician to see the resistor's nominal value regardless of how the component was mounted. Here's a pic of what the inside of typical 1960's era television set looked like:
Obviously, the advent of the printer circuit board (PCB, or just PC) neatened things up quite a bit, and eventually it led to more "modular" construction where specific circuits were mounted on specific boards. A manufacturing technique still used today, although the amount of componentry and function when can be fit on a single board often precludes the necessity of multiple boards.
It should also be mentioned that there is also a Capacitor Color Code and an Inductor Color Code. Again, back in the day of point-to-point wiring, the "banded" color codes were used to ease the identification, installation and repair electrical and electronic circuits.
As manufacturing techniques began to improve it became increasingly common for the actual component values to be printed on the components directly. For PC mounted components this worked well as components were all viewed from the same basic perspective, the top of the circuit board.
The ever increasing desire to make products smaller & more reliable led to the development of Surface Mount Technology back in the 60's, pushed by the U.S. Space program and paralleled with the development of digital computers. Still, Surface Mount Technology (SMT or SMD (surface mount device)) had only impacted about 10% of the electronics market by the mid 1980's!
However, the small size of the SMD's required a new development to express the component values as many SMD components were too small and didn't provide sufficient area to imprint the component values.
Here's the codings & markings for surface mount resistors.
Another way of labelling components is known as the RKM Code. This technique originally was used in documentation as it had the advantage of not requiring the use of a decimal point to define a component's value. This is important because documents which are photo-copied or reproduced in various ways might either no copy the small decimal point, or perhaps a speck of dirt or copy imperfection might insert a decimal point where one shouldn't exit. Those scenarios are not possible using this system. It is now often seen printed on electronic components, instead of the other methods mentioned above.
Week #14: Electronic Components, Labelling & Surface Mount Components
-
- Posts: 2382
- Joined: Fri Sep 04, 2015 6:59 pm
Jump to
- Electronics Systems - General Information
- ↳ Instructor Information
- ↳ Career Related Links and Information
- ↳ Career Information (General)
- ↳ Interviewing Skills
- 2024 Spring
- ↳ EET-250 Control Systems
- ↳ EET-250 Lecture
- ↳ EET-250 Lab
- ↳ EET-255 Advanced Topics in E.E.T./Automation
- ↳ EET-260 Microprocessor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ EET-265 Advanced Automation
- ↳ EET-265 Lecture
- ↳ EET-265 Lab
- ↳ Information for All Students
- ↳ Progress Reports for Sorting Group
- ↳ Progress Reports for Vending Group
- ↳ Progress Reports for HVAC Group
- Previous Semesters
- ↳ 2023 Fall
- ↳ EET-101 PCs, Programming & Robots
- ↳ EET-101 Lecture
- ↳ EET-101 Lab
- ↳ EET-120 Fluid Power Technology
- ↳ EET-200 Solid State Electronics
- ↳ EET-200 Lecture
- ↳ EET-200 Lab
- ↳ EET-210 Digital and Linear Circuits
- ↳ EET-210 Lecture
- ↳ EET-210 Lab
- ↳ 2023 Spring
- ↳ EET-250 Control Systems
- ↳ EET-250 Lecture
- ↳ EET-250 Lab
- ↳ EET-255 Advanced Topics in E.E.T./Automation
- ↳ EET-260 Microprocessor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ EET-265 Advanced Automation
- ↳ EET-265 Lecture
- ↳ EET-265 Lab
- ↳ Progress Reports for Golfball Group
- ↳ Progress Reports for Car Assembly
- ↳ Lab Information for All Students
- ↳ 2022 Fall
- ↳ EET-101 PCs, Programming & Robots
- ↳ EET-101 Lecture
- ↳ EET-101 Lab
- ↳ EET-120 Fluid Power Technology
- ↳ EET-200 Solid State Electonics
- ↳ EET-200 Lecture
- ↳ EET-200 Lab
- ↳ EET-210 Digital and Linear Circuits
- ↳ EET-210 Lecture
- ↳ EET-210 Lab
- ↳ EET-235L-D03 PLCs 2 Lab
- ↳ 2022 Spring
- ↳ EET-250 Control Systems
- ↳ EET-250 Lecture
- ↳ EET-250 Lab
- ↳ EET-255 Advanced Topics in E.E.T./Automation
- ↳ EET-260 Microprocessor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ EET-265 Advanced Automation
- ↳ EET-265 Lecture
- ↳ EET-265 Lab
- ↳ Lab Information for All Students
- ↳ Automated Greenhouse - Weekly Progress Reports (Individual)
- ↳ 2021 Fall
- ↳ EET-101 PCs, Programming & Robots
- ↳ EET-101 Lecture
- ↳ EET-101 Lab
- ↳ EET-120 Fluid Power Technology
- ↳ EET-200 Solid State Electronics
- ↳ EET-200 Lecture
- ↳ EET-200 Lab
- ↳ EET-210 Digital and Linear Circuits
- ↳ EET-210 Lecture
- ↳ EET-210 Lab
- ↳ 2021 Spring
- ↳ EET-120 Fluid Power
- ↳ EET-250 Control Systems
- ↳ EET-250 Lecture
- ↳ EET-250 Lab
- ↳ EET-255 Advanced Topics in E.E.T./Automation
- ↳ EET-260 Microprocessor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ EET-265 Advanced Automation
- ↳ EET-265 Lecture
- ↳ EET-265 Lab
- ↳ End of Semester Project Requirements
- ↳ Allen Bradley Information
- ↳ Conveyor Information
- ↳ Dobot Information
- ↳ EP-250 Pneumatic Trainer Info
- ↳ Fanuc Information
- ↳ Keyence SZ-01S Laser Safety Scanner
- ↳ Misc. Knowledge Base
- ↳ Misc. Lab Equipment Documentation
- ↳ Really Old Forums
- ↳ 2020 Fall
- ↳ Linux - General help
- ↳ EET-101 PCs, Programming & Robots
- ↳ EET-101 Lecture
- ↳ EET-101 Lab
- ↳ EET-120 Fluid Power
- ↳ EET-200 Solid State Electonics
- ↳ EET-200 Lecture
- ↳ EET-200 Lab
- ↳ EET-210 Digital and Linear Circuits
- ↳ EET-210 Lecture
- ↳ EET-210 Lab
- ↳ ELE-111L Internet of Things Lab
- ↳ Basic Subnetting
- ↳ 2020 Spring
- ↳ EET-120 Fluid Power
- ↳ EET-240 Robotics & Automation
- ↳ EET-250 Control Systems
- ↳ EET-250 Lecture
- ↳ EET-250 Lab
- ↳ EET-255 Advanced Topics in E.E.T./Automation
- ↳ EET-260 Micro-Processor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ EET-265 Advanced Automation
- ↳ EET-265 Lecture
- ↳ EET-265 Lab
- ↳ Lab Information for All Groups
- ↳ Weekly Progress Reports - Carwash Project
- ↳ Weekly Progress Reports - Filling Project
- ↳ 2019 Fall
- ↳ CSE-110 Information, Reading and Video List
- ↳ CSE-110 - General Information
- ↳ EET-101 PCs, Robots & Programming
- ↳ EET-101 Lecture
- ↳ EET-101 Lab
- ↳ EET-104/5/6 Safety, Diagrams, Troubleshooting
- ↳ EET-104 Safety & Health in Industry (Mondays)
- ↳ EET-105 Technical Diagrams for Automation (Wednesdays)
- ↳ EET-106 Troubleshooting (Fridays)
- ↳ EET-120 Fluid Power
- ↳ EET-200 Solid State Electronics
- ↳ EET-200 Lecture
- ↳ EET-200 Lab
- ↳ EET-210 Digital & Linear Circuits
- ↳ EET-210 Lecture
- ↳ EET-210 Lab
- ↳ EET-250 Control Systems
- ↳ EET-250 Lecture
- ↳ EET-250 Lab
- ↳ EET-260 Micro-Processor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ 2019 Spring
- ↳ EET-101 PC's, Programming & Robots
- ↳ EET-101 Lecture
- ↳ EET-101 Lab
- ↳ EET-120 Fluid Power
- ↳ Fluid Power (Public)
- ↳ EET-210 Digital and Linear Circuits
- ↳ EET-210 Lecture
- ↳ EET-210 Lab
- ↳ EET-235 PLCs 2
- ↳ EET-235 Lecture
- ↳ EET-235 Lab
- ↳ EET-250 Control System Theory
- ↳ EET-250 Lecture
- ↳ EET-250 Lab
- ↳ EET-255 Advanced Topics in E.E.T./Automation
- ↳ EET-260 Microprocessor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ EET-265 Advanced Automation
- ↳ EET-265L Lab - Day
- ↳ Weekly Progress Reports - Cold Beverage Dispenser
- ↳ Weekly Progress Reports - Warehouse Storage/Retrieval
- ↳ EET-265L Lab - Evening
- ↳ ELE-111 Internet of Things
- ↳ ELE-111 General Information
- ↳ ELE-111 Reading List
- ↳ ELE-115L - Bigos
- ↳ General
- ↳ Mech-Elec WFD Training
- ↳ Mech-Elec (Public)
- ↳ Mech-Elec WFD Training -Cohort 2
- ↳ 2018 Fall
- ↳ CSE-110 Intro to Comp (A+)
- ↳ CSE-110 General Information
- ↳ EET-101 PC's, Programming & Robots
- ↳ EET-101 Lecture
- ↳ EET-101 Lab
- ↳ EET-104/105/106 Safety & Health, Tech Diagrams, Troubleshooting
- ↳ EET-104 Safety & Health in Industry
- ↳ EET-105 Technical Diagrams for Automation
- ↳ EET-105 Public
- ↳ EET-106 Developing Troubleshooting Skills
- ↳ EET-200 Solid State Electronics
- ↳ EET-200 Lecture
- ↳ EET-200 Lab
- ↳ EET-210 Digital and Linear Circuits
- ↳ EET-210 Lecture
- ↳ EET-210 Lab
- ↳ 2018 Spring
- ↳ CSE-110L-Intro To Comp
- ↳ CSE-110L General
- ↳ CSE-220 Security Reading List
- ↳ EET-120 Fluid Power Technology
- ↳ EET-120 Fluid Power (Public)
- ↳ EET-250 Control System Theory
- ↳ EET-250 Lecture
- ↳ EET-250 Lab
- ↳ EET-255 Advanced Topics in EET/Automation
- ↳ EET-260 Microprocessor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ EET-265 Advanced Automation
- ↳ EET-265 Lecture
- ↳ EET-265 Lab
- ↳ Weekly Progress Reports - Post Weekly Progress Reports here.
- ↳ 2017 Fall
- ↳ CSE-110 Intro To Computers (A+)
- ↳ CSE-110 Information
- ↳ EET-101 PCs, Programming & Robots
- ↳ EET-101 Lecture
- ↳ EET-101 Lab
- ↳ EET-104/105/106 Safety/Tech. Diagrams/Troubleshooting
- ↳ EET-104 Safety & Health in Industry
- ↳ EET-105 Technical Diagrams for Automation
- ↳ EET-106 Developing Troubleshooting Skills
- ↳ EET-200 Solid State Electronics
- ↳ EET-200 Lecture
- ↳ EET-200 Lab
- ↳ EET-210 Digital and Linear Circuits
- ↳ EET-210 Lecture
- ↳ EET-210 Lab
- ↳ EET-260 Microprocessor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ 2017 Spring
- ↳ General Resouces
- ↳ CSE-110 Intro to Comp
- ↳ CSE-110 Reading List & General Information (Public)
- ↳ CSE-160 Intro To Programming (Python)
- ↳ CSE-240 Resources
- ↳ EET-120 Fluid Power
- ↳ EET-250 Control System Theory
- ↳ EET-250 Lecture
- ↳ EET-250 Lab
- ↳ EET-255 Advanced Topics in E.E.T.
- ↳ EET-255 Lecture (Public)
- ↳ EET-260 Microprocessor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ EET-265 Advanced Automation
- ↳ EET-265 Lecture
- ↳ EET-265 Lab
- ↳ Allen-Bradley Micro820 PLC Info
- ↳ Trail Mix Vending Machine - Evening
- ↳ Progress Reports
- ↳ Support Information
- ↳ Team Fluid Processing - Day
- ↳ Progress Reports
- ↳ Support Information
- ↳ Team Warehouse Stocking/Retrieval - Day
- ↳ Progress Reports
- ↳ Support Information
- ↳ ELE-111 Internet of Things (IOE)
- ↳ General Information
- ↳ 2016 Fall
- ↳ CSE-140 Operating Systems 1
- ↳ General Information
- ↳ CSE-110 Intro To Computer Systems
- ↳ General Information
- ↳ CSE-150 Linux Command Line and Shell Programming
- ↳ General Information
- ↳ CSE-160 Intro To Programming Using Python
- ↳ General Information
- ↳ CSE-220 Computer and Network Security
- ↳ General Information
- ↳ CSO-205 Cisco Scaling Networks
- ↳ EET-101 PCs, Programming & Robots
- ↳ EET-101 Lecture
- ↳ EET-101 Lab
- ↳ EET-104/105/106 Safety, Tech. Diagrams & Troubleshooting
- ↳ EET-104 Safety & Health in Industry
- ↳ EET-105 Reading Technical Diagrams
- ↳ EET-106 Developing Troubleshooting Skills
- ↳ EET-200 Solid State Electronics
- ↳ EET-200 Lecture
- ↳ EET-200 Lab
- ↳ EET-210 Digital and Linear Circuits
- ↳ EET-210 Lecture
- ↳ EET-210 Lab
- ↳ EET-250 Control System Theory
- ↳ EET-250 Lecture
- ↳ EET-250 Lab
- ↳ EET-260 Microprocessor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ ELE-110 Electronics For Techs 1
- ↳ General Information
- ↳ ELE-120 Printed Circuit Design
- ↳ General Information
- ↳ ELE-130 Intro To Project Management
- ↳ General Information
- ↳ ELE-210 Circuit Theory
- ↳ General Information
- ↳ ELE-250 Research and Development
- ↳ General Information
- ↳ 2016 Spring
- ↳ CSE-110 Intro To Computer Systems
- ↳ CSE-110 General Information
- ↳ Linux and Programming
- ↳ CSE-150 Linux and Shell Programming
- ↳ CSE-150 General information
- ↳ CSE-160 Introduction to Programming with Python
- ↳ CSE-160 General
- ↳ CSE-220 Computer and Network Security
- ↳ CSE-220 General Information
- ↳ CSE-240 Operating Systems 2 (Windows 2012 Server)
- ↳ CSE-240 General Information
- ↳ CSE-260 Application Servers
- ↳ CSE-260 General
- ↳ ELE-111 Internet of Everything (IOE)
- ↳ ELE-111 General
- ↳ ELE-115 Electronics for Techs 2
- ↳ ELE-115 General Information
- ↳ ELE-265 Senior Projects
- ↳ EET-120 Fluid Power Technology
- ↳ EET-130 Fundamentals of Motor Controls
- ↳ EET-135 PLCs 1
- ↳ EET-140 Fundamentals of Robotics
- ↳ EET-250 Control System Theory
- ↳ EET-250 Lecture
- ↳ EET-250 Lab
- ↳ EET-255 Advanced Topics in E.E.T.
- ↳ EET-260 Microprocessor Applications
- ↳ EET-260 Lecture
- ↳ EET-260 Lab
- ↳ EET-265 Advanced Automation
- ↳ EET-265 Lecture
- ↳ EET-265 Lab
- ↳ 2015 Fall
- ↳ 2015 Fall
- ↳ CSE-110 Intro to Computer Systems
- ↳ CSE-110 General
- ↳ CSE-140 Operating Systems 1
- ↳ CSE-140 General
- ↳ CSE-150 Linux Command and Shell Programming
- ↳ CSE-150 General
- ↳ CSE-155 Intro to Programming
- ↳ CSE-155 General Information
- ↳ CSE-220 Computer and Network Security
- ↳ CSE-220 General
- ↳ CSO-105 Cisco Networking
- ↳ CSO-105 General
- ↳ CSO-205 Cisco 3 Reading List
- ↳ ELE-111 Internet of Everything
- ↳ ELE-111 General
- ↳ ELE-111 Reading List
- ↳ ELE-121/2/3 Documentation
- ↳ ELE-121/2/3 General
- ↳ ELE-130 Intro to Project Management
- ↳ ELE-130 - General
- ↳ ELE-210 Circuit Theory
- ↳ ELE-210 General
- ↳ ELE-210 Lab (Private)
- ↳ EET-101 PCs, Programming & Robots
- ↳ EET-101 Lecture
- ↳ EET-101 Lab
- ↳ EET-104 Safety & Health in Industry
- ↳ EET-105 Technical Diagrams for Automation
- ↳ EET-106 Developing Troubleshooting Skills
- ↳ EET-120 Fluid Power Technology
- ↳ EET-135 PLCs 1
- ↳ Lecture
- ↳ Lab
- ↳ EET-140 Fundamentals of Robotics
- ↳ Lecture
- ↳ Lab
- ↳ EET-200 Solid State Circuits
- ↳ Lecture
- ↳ Lab
- ↳ EET-210 Digital & Linear Circuits
- ↳ Lecture
- ↳ Lab
- ↳ EET-240 Robotics/Automated Systems
- ↳ Lecture
- ↳ Lab
- ↳ EET-265 Advanced Automation
- ↳ Lecture
- ↳ Lab/Project
- ↳ E-Makers's Club
- ↳ E-Makers General information
- ↳ Meeting schedule and locations.