RF Attenuator 8dB 50 Ohm SMA M3933/25-08N Equivalent & Substitute Parts

Part Overview

The M3933/25-08N is an RF attenuator manufactured by Amphenol SV Microwave, designed for inline attenuation applications across microwave frequency ranges. This component provides 8dB attenuation at 50 Ohm impedance with SMA connectors, suitable for RF signal conditioning in systems operating from DC to 18 GHz. The part is currently in active production status with 1087 units available in inventory. Substitute parts become necessary when primary sourcing is unavailable, when alternative packaging formats are required, or when supply chain optimization is needed while maintaining identical electrical performance.

Substiute Parts

M3933/25-08N

Amphenol SV MicrowaveIn Stock: 1103M3933/25-08N Datasheet

Current PartRFQ

AT-108V

Hirose Electric Co LtdIn Stock: 1067AT-108V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of RF attenuators is determined by strict equivalence across electrical and mechanical parameters. The M3933/25-08N can be substituted with the AT-108V based on the following criteria:

Critical Matching Parameters:

• Attenuation Value: 8dB (exact match required)
• Frequency Range: 0 Hz ~ 18 GHz (exact match required)
• Impedance: 50 Ohms (exact match required)
• Power Rating: 2W (exact match required)
• Package Type: SMA In-Line Module (exact match required)

The AT-108V meets all critical electrical specifications and mechanical form factor requirements, making it a direct parametric equivalent. Packaging format differs (Bag versus Bulk), which affects procurement and inventory management but does not impact functional performance in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (M3933/25-08N): The M3933/25-08N is recommended for new designs and ongoing production due to its Active product status. This designation indicates continued manufacturer support, availability assurance, and ongoing quality control. ROHS3 compliance provides the highest environmental and regulatory standard for electronic components.

Substitute Selection (AT-108V): The AT-108V is suitable for applications where the primary part is unavailable or when bulk packaging format is operationally preferred. However, this part carries a Last Time Buy status, indicating limited future availability. Selection of AT-108V should be accompanied by long-term supply chain planning. Both parts maintain identical electrical performance and mechanical compatibility, with RoHS compliance confirmed for both variants.

Compliance Considerations: Both parts are classified under ECCN EAR99 and share the same HTSUS code (8533.21.0090), ensuring equivalent regulatory treatment in procurement and export documentation.

Frequently Asked Questions (FAQ)

Q: Can AT-108V be used as a direct replacement for M3933/25-08N in existing circuit designs?

A: Yes. Both parts provide identical electrical specifications: 8dB attenuation, 0 Hz to 18 GHz frequency range, 50 Ohm impedance, and 2W power rating. The SMA In-Line Module package type is identical, ensuring mechanical and electrical compatibility without circuit modification.

Q: What is the difference between Bag and Bulk packaging formats?

A: Packaging format affects inventory management and procurement logistics but does not impact component performance. Bag packaging (M3933/25-08N) typically provides smaller quantity units with individual protection. Bulk packaging (AT-108V) provides larger quantities in standard containers. Selection depends on production volume requirements and inventory handling procedures.

Q: Why is AT-108V marked as Last Time Buy?

A: Last Time Buy status indicates that Hirose Electric Co Ltd has announced end-of-life for this part number. New orders may still be fulfilled from existing inventory (989 units available), but future availability is not guaranteed. For long-term production requirements, the Active status M3933/25-08N is the preferred choice.

Q: Are there any differences in RoHS compliance between these parts?

A: Both parts are RoHS compliant. M3933/25-08N meets ROHS3 standard (the most current revision), while AT-108V meets RoHS standard. Both certifications satisfy current regulatory requirements for electronic component manufacturing and use.

Q: Can these parts be used interchangeably in high-frequency applications above 10 GHz?

A: Yes. Both parts are specified for operation across the full 0 Hz to 18 GHz frequency range, which includes all microwave bands up to 18 GHz. Attenuation performance remains consistent across this entire frequency spectrum for both part numbers.

Q: What should be considered when selecting between these two parts for new procurement?

A: For new designs and ongoing production, M3933/25-08N is the recommended choice due to Active product status and ROHS3 compliance. AT-108V should be reserved for situations where M3933/25-08N is unavailable or when bulk packaging format is operationally necessary. Supply chain planning should account for AT-108V's Last Time Buy status.