While I don't have access to specific databases to recommend exact replacements, I can suggest a general approach to replacing the resistor R1 given the specification of R1:
Resistance: 500 Ω
Package: SMD_0603_1608Metric
You should look for a resistor with:
The same resistance value (500 Ω)
The same package size (SMD 0603, which is 1608 in metric dimensions)
A power rating that matches or exceeds your requirements (common values for this package size are 0.1W or 0.125W)
It's also good to ensure the replacement resistor has a similar tolerance, typically 1% or 5% for most standard applications.
You can check with electronics component distributors like Digi-Key, Mouser, or RS Components to find exact part numbers that meet these specifications. If you have any other specific requirements, such as high precision or specific temperature coefficients, you should also take those into account.
hubert
copilot