2. Z0603C600APMST Substitution Conclusion Conditionally acceptable; substitution should be evaluated based on the specific application circuit. This part, manufactured by KEMET, is compatible with the original part in mechanical and basic electrical characteristics such as package (0603) and rated current (2.5A). Two differences exist: first, the nominal impedance is reduced from 75Ω to 60Ω @ 100 MHz, which will weaken attenuation near the target frequency and may affect filtering performance in the high-frequency range. Second, its maximum DC resistance (DCR) is lowered from 50mΩ to 40mΩ. Under the same operating current, this reduces the DC voltage drop and power dissipation across the bead, offering a slight advantage for power rail voltage stability. Feasibility of substitution depends on the strictness of high-frequency noise suppression requirements in the original design. If the circuit has sufficient margin or relaxed requirements for noise suppression around 100 MHz, and lower DC loss is prioritized, then substitution is possible. If the original design relies on the specific 75Ω impedance for EMI control, this part may not be suitable, and board-level testing should be performed to verify filtering performance.