AT-120V Replacement: LCAT1000-20, FMAT7620-20

Original Part

AT-120V

Hirose Electric Co Ltd

RF Attenuators 20dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

Alternative Part

LCAT1000-20

L-com

RF Attenuators 20dB 0 Hz ~ 6 GHz 50 Ohms 2W SMA In-Line Module

FMAT7620-20

Fairview Microwave

RF Attenuators 20dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

1. LCAT1000-20 Substitution Conclusion The LCAT1000-20 is not a direct drop-in replacement for the original AT-120V part. The discrepancy lies in its frequency range, which is limited to 0 Hz–6 GHz, significantly lower than the original's 18 GHz. In the high‑frequency band from 6 GHz to 18 GHz, key performance parameters such as attenuation accuracy, impedance matching, and power handling cannot be guaranteed. This may lead to signal distortion, increased reflection (degraded VSWR), or even device failure. Therefore, the LCAT1000-20 is only suitable for low‑frequency applications where the operating frequency does not exceed 6 GHz.

2. FMAT7620-20 Substitution Conclusion The FMAT7620-20 is a viable direct replacement in terms of core electrical specifications. Its key parameters—attenuation value (20 dB), frequency range (0–18 GHz), rated power (2 W), and impedance (50 Ω)—are identical to those of the original part. Across the full DC‑to‑18 GHz band, it provides equivalent signal attenuation performance, power‑handling capability, and impedance‑matching characteristics. The interface form (SMA in‑line) is also the same, allowing direct integration into the existing signal chain without compromising high‑frequency system performance.

Analysis ID: 0E1F-60E9000

Based on part parameters and for reference only. Not to be used for procurement or production.