M3933/30-25N Replacement: AT-112V, M3933/25-38S

Original Part

M3933/30-25N

Amphenol SV Microwave

RF Attenuators 12dB 0 Hz ~ 32 GHz 50 Ohms 2W SMA In-Line Module

Alternative Part

AT-112V

Hirose Electric Co Ltd

RF Attenuators 12dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

M3933/25-38S

Amphenol SV Microwave

RF Attenuators 12dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

1. AT-112V Substitution Conclusion In applications where the frequency requirement does not exceed 18 GHz, the AT-112V can serve as a substitute for the original part number, though potential risks due to manufacturer differences must be considered. Compared to the original part (M3933/30-25N), the key distinction of the AT-112V is its operational frequency limit of 18 GHz, whereas the original supports up to 32 GHz. If the system operates above 18 GHz, the AT-112V is unsuitable and may lead to severe degradation or failure in signal attenuation performance. All other parameters—attenuation value, power handling capacity, impedance, and connector interface—are identical. The AT-112V is sourced from a different manufacturer (Hirose) and may exhibit variances in performance consistency, temperature stability, long-term reliability, and subtle mechanical dimensional tolerances compared to the original Amphenol design. For military or high-reliability applications, thorough validation is required prior to substitution.

2. M3933/25-38S Substitution Conclusion For applications not exceeding 18 GHz, the M3933/25-38S is a preferable substitute over the AT-112V, as it shares the same product series and manufacturer as the original part, though it is similarly limited in frequency range. This part originates from the same manufacturer (Amphenol SV Microwave) and belongs to the same product family as the original (M3933/30-25N), ensuring high consistency and heritage in manufacturing processes, materials, and quality control. The primary differentiator remains the frequency range (0–18 GHz versus 0–32 GHz), which fundamentally restricts its use in any system operating within the 18–32 GHz band. Within this frequency constraint, given the common manufacturer, it is expected to offer better alignment and reliability in terms of electrical performance smoothness, temperature coefficient, VSWR characteristics, and mechanical interface compatibility compared to a cross-manufacturer substitute. Consequently, the associated substitution risk is relatively lower.

Analysis ID: E11B-B536000

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