LCAT1005-20 Replacement: AT-120V, M3933/14-04S

Original Part

LCAT1005-20

L-com

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

Alternative Part

AT-120V

Hirose Electric Co Ltd

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

M3933/14-04S

Amphenol SV Microwave

RF Attenuators 20dB 0 Hz ~ 12.4 GHz 50 Ohms 2W SMA In-Line Module

1. AT-120V Substitution Conclusion From a core electrical parameter perspective, the AT-120V is a direct and viable substitute for the original LCAT1005-20. Both units are identical in all key specifications: attenuation value (20 dB), frequency range (DC–18 GHz), power rating (2 W), impedance (50 Ω), and connector type (SMA in-line module). Across the entire DC to 18 GHz band, their signal attenuation performance, power handling capability, and system matching are theoretically equivalent and interchangeable. The primary differences lie in the manufacturer (Hirose Electric), along with supply chain, pricing, lead time, and potential minor variations in non‑critical performance parameters (such as specific VSWR curves or temperature coefficients). These differences, however, are unlikely to affect basic functionality in the vast majority of general‑purpose RF applications, making the substitution highly feasible.

2. M3933/14-04S Substitution Conclusion The M3933/14-04S presents a clear limitation as a substitute for the original LCAT1005-20 and must be evaluated against the actual application frequency. Its key deviation from the original part is its frequency range, which extends only to 12.4 GHz, whereas the original supports up to 18 GHz. If the application involves signals in the 12.4 GHz to 18 GHz band (e.g., certain Ku‑band applications or high‑end test and measurement systems), this part will not function correctly and may lead to inaccurate attenuation, increased reflection, or even potential damage. For systems whose operating frequency is definitively below 12.4 GHz, it remains compatible with the original in all other critical parameters—attenuation, power rating, impedance, and interface—and can be used as a substitute. The manufacturer of this part is Amphenol SV Microwave, and it may often comply with specific high‑reliability or military standards; however, this distinction does not directly impact the assessment of its basic electrical substitution feasibility.

Analysis ID: A64B-A610000

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