Operational Amplifier Fundamentals Unit 1 – The Operational Amplifier
Exercise 1 – Op Amp Types and Packages
EXERCISE OBJECTIVE
When you have completed this exercise, you will be able to recognize different op amp
packages. You will verify your knowledge through observation and recognition.
EXERCISE DISCUSSION
- Op amps are available in a variety of package styles.
- Op amp package material can be metal, ceramic, or plastic.
- Not all IC pins connect electrically to the op amp.
- "No connection" (NC) pins add stability and ruggedness to the package.
- From a bottom view, pin count progresses in a clockwise (CW) direction
- From a top view, pin count progresses in a counterclockwise (CCW) direction.
- On a TO-5 (top hat) package, pin 1 is located adjacent to the package tab.
- On the flat pack, pin 1 is located adjacent to the dot or round indentation on the top side of
the package. - On the DIP package, pin 1 is located adjacent to the dot or half round notch on the top side of
the package. - ICs are available in single or multiple op amp configurations: typically one, two (dual), or
four (quad) per package. - The LF441 used on the circuit board is a single op amp package type.
- The LF441 DIP outline shows the IC pin assignments. These assign-ments are set by the
device manufacturer and cannot be altered. - Since each op amp type is unique, the device manufacturer stamps a part number on the top
surface of each IC. - The TO-5 LF441 op amp outline shows the same pin assignments as the DIP, but in a
circular pattern. - Dual and quad style LF441 op amps have specific pin assignments. Note the absence of null
inputs.