Introduction: Component obsolescence in PCB design is a common challenge. This article offers straightforward solutions with practical examples and an easy-to-understand substitution chart.
The Problem with Outdated Components: Outdated components in PCBs can lead to production delays and functional issues. For instance, using an obsolete microcontroller might seem cost-effective but could lead to compatibility problems with newer peripheral devices.
Simple Solution: The key is to find current components that match the functionality and footprint of the outdated ones.
Practical Example: Suppose a design uses the ATmega328 microcontroller, which has become hard to source. A suitable, more available substitute is the PIC16F887. Both have similar functionalities but the PIC16F887 offers enhanced features and better availability.
Substitution Chart:
- Component: Microcontroller
- Outdated: ATmega328
- Substitute: PIC16F887
- Reason for Substitute: Better availability, enhanced features
- Considerations: Check compatibility with existing peripherals
Step-by-Step Substitution Process:
- Identify the outdated component: ATmega328 microcontroller.
- Find a substitute: PIC16F887, based on availability and feature set.
- Verify compatibility: Ensure that the new microcontroller works with existing peripherals and the PCB footprint.
- Update the design: Revise schematics and BOM with the new component.
- Test the design: Conduct a series of tests to confirm that the substitute component functions as expected.
Conclusion: Substituting outdated PCB components doesn’t have to be complicated. By following a straightforward process and utilizing resources like substitution charts, designers can easily navigate component obsolescence.
