Original Part
Alternative Part
1. SA18E-12 Substitution Conclusion
The SA18E-12 can directly replace the original part number FMAT7620-12 in terms of electrical performance and mechanical form factor. A comparison of the two shows that all key technical parameters are identical, including a 12 dB attenuation value, a broad operating frequency range from 0 to 18 GHz, a 2W power handling capability, and 50-ohm impedance. The primary distinction noted in the part description is that the SA18E-12 is specified as "PLUG-JACK SMA SS 1.35", indicating its SMA connector uses a hex nut with a 1.35 mm across-flats width (compared to the standard SMA dimension of 2.74 mm). During physical installation, this may necessitate the use of a dedicated thin-wall wrench for assembly and disassembly, which could pose an inconvenience in space-constrained applications or when using standard tools. However, provided the correct installation tool is used, its electrical functionality and mechanical interface (SMA male plug to female jack) are fully equivalent to the original part.
2. SA6H-12 Substitution Conclusion
The SA6H-12 is not a universal substitute for the original part number FMAT7620-12; its suitability is strictly dependent on the specific application frequency. The core difference between the two lies in the operational frequency range: the SA6H-12 supports only 0-6 GHz, whereas the original part operates up to 18 GHz. If the application involves high-frequency signals above 6 GHz (e.g., Ku-band satellite communications, high-end test and measurement), using the SA6H-12 would introduce significant additional attenuation and performance degradation, potentially leading to system failure. It is suitable only for low-frequency scenarios where the operating frequency is definitively confined to below 6 GHz. Under this condition, its other parameters—such as attenuation value, power rating, and impedance—match those of the original part.
Analysis ID: 02B9-681C000
Based on part parameters and for reference only. Not to be used for procurement or production.
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