General Information (Applies to all BOMs):

️· Manufacturer: ON Semiconductor
️· Format: Bill of Materials (BOM)
️· Application: Likely for evaluation boards (EVB) – indicated by "OPAMP1EVB" in the filenames.
️· Website: [http://onsemi.com](http://onsemi.com)
️· Disclaimer: A long disclaimer regarding liability, intended use, and legal considerations is included at the end of each document. It emphasizes the importance of proper validation and prohibits use in life-sustaining applications.

BOM Comparison & Summary:

1. NCS2550, NCS2551, and NCS2552 (OPAMP1EVB/D - 7)

️· Note: Assembled board has a default gain of +2.0. There is an attenuation factor of three when used in conjunction with a 50 Ω termination resistance of the measuring instrument.
️· R4 and R6: 150 Ω
️· R10: 100 Ω
️· Parts not installed: C9 and R1, R11

2. NCS2550, NCS2551, and NCS2552 (OPAMP1EVB/D - 6)

️· Note: Assembled board has a default gain of +2.0. There is an attenuation factor of three when used in conjunction with a 50 Ω termination resistance of the measuring instrument.
️· R4 and R6: 150 Ω
️· R10: 100 Ω
️· Parts not installed: C9 and R1, R11

3. NCS2550, NCS2551, and NCS2552 (OPAMP1EVB/D - 8)

️· Note: Assembled board has a default gain of +2.0. There is an attenuation factor of three when used in conjunction with a 50 Ω termination resistance of the measuring instrument.
️· R4 and R6: 150 Ω
️· R10: 100 Ω
️· Parts not installed: C9 and R1, R11

4. NCS2550, NCS2551, and NCS2552 (OPAMP1EVB/D - 5)

️· Note: Assembled board has a default gain of +2.0. There is an attenuation factor of three when used in conjunction with a 50 Ω termination resistance of the measuring instrument.
️· R4 and R6: 150 Ω
️· R10: 100 Ω
️· Parts not installed: C9 and R1, R11

Common Components (across all BOMs):

️· C1, C2, C3, C5, C7: Capacitors
️· D6, D7: Diodes
️· J1-J3, J4-J6: Connectors (BNC, Banana)
️· L1, L2: Inductors
️· R2, R3, R5, R7: Resistors
️· R10: Resistor (100 Ω)
️· JMP1: Jumper
️· C9: Capacitor (Not installed)
️· R1, R11: Resistors (Not installed)

Key Differences / Changes between Versions (significant):

️· Version Number Indication: The version is indicated by the number attached to the file name (e.g., "OPAMP1EVB/D - 1"). This suggests revisions or updates to the board design.
️· Attenuation Factor: It varies between versions.
️· Component values: Resistor values (R4, R6, R10) sometimes change between versions. This could signify design adjustments for specific performance requirements.
️· Parts not installed: C9 and R1 and R11 are not installed on any of the versions.