RF Attenuator M3933/25-75S Equivalent & Substitute Parts

Part Overview

The Amphenol SV Microwave M3933/25-75S is an RF attenuator designed for inline attenuation applications across microwave frequency ranges. This component provides 8.5dB attenuation at 50 Ohm impedance with a 2W power handling capability across the 0 Hz to 18 GHz frequency band. The part is supplied in an SMA connector configuration as an in-line module.

The M3933/25-75S maintains Active product status with full ROHS3 compliance and EAR99 export classification. Substitute parts become necessary when primary inventory is unavailable, when alternative packaging formats are required, or when design flexibility permits operation within the specified electrical parameter ranges.

Substiute Parts

M3933/25-75S

Amphenol SV MicrowaveIn Stock: 734M3933/25-75S Datasheet

Current PartRFQ

AT-109V

Hirose Electric Co LtdIn Stock: 1050AT-109V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for RF attenuators is determined by strict alignment of electrical and mechanical parameters. The following criteria establish whether a part qualifies as an equivalent or substitute:

Primary Substitution Criteria:

• Frequency Range: Must cover or exceed 0 Hz ~ 18 GHz
• Impedance: Must be 50 Ohms
• Connector Type: Must be SMA
• Package Type: Must be SMA In-Line Module
• Power Rating: Must be equal to or greater than 2W

Secondary Consideration:

• Attenuation Value: The M3933/25-75S specifies 8.5dB. Substitute parts with attenuation values within the allowable tolerance range of this product category are acceptable when all primary criteria are met.

Compliance Alignment:

• RoHS Status: Substitute parts must maintain RoHS compliance (ROHS3 or equivalent)
• ECCN Classification: Must align with EAR99 export classification

The AT-109V from Hirose Electric Co Ltd meets all primary substitution criteria with the exception of attenuation value (9dB versus 8.5dB). This 0.5dB variance falls within acceptable engineering tolerance for RF attenuator applications where frequency response, impedance matching, and power handling remain identical.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: M3933/25-75S

The M3933/25-75S maintains Active product status with full manufacturing support and ongoing availability. This part is the preferred choice for new designs and applications requiring long-term supply continuity. ROHS3 compliance ensures alignment with current environmental regulations.

Substitute Selection: AT-109V

The AT-109V qualifies as an electrical and mechanical equivalent based on matching frequency range, impedance, power rating, connector type, and package configuration. The 0.5dB attenuation variance (9dB versus 8.5dB) represents a measurable but acceptable difference within RF attenuator application tolerances.

Product Status Consideration:

The AT-109V carries Last Time Buy status, indicating limited remaining inventory and no future manufacturing. Selection of AT-109V is appropriate only when:

• Existing inventory of M3933/25-75S is unavailable
• Application design permits the 0.5dB attenuation increase
• Supply chain requirements can be met within the Last Time Buy window

Compliance Alignment:

Both parts maintain EAR99 export classification and RoHS compliance, ensuring regulatory compatibility across manufacturing and distribution channels.

Frequently Asked Questions (FAQ)

Q: Can AT-109V be used as a direct replacement for M3933/25-75S?

A: AT-109V meets all mechanical and primary electrical specifications (frequency range, impedance, power rating, connector type, package configuration). The 0.5dB attenuation difference must be evaluated against application requirements. If the circuit design accommodates 9dB attenuation instead of 8.5dB, AT-109V is functionally compatible.

Q: What is the significance of the attenuation value difference?

A: The M3933/25-75S provides 8.5dB attenuation while AT-109V provides 9dB attenuation. This 0.5dB variance affects signal level reduction in the circuit. Applications with tight attenuation specifications must account for this difference in system calculations.

Q: Are both parts suitable for the same frequency applications?

A: Yes. Both parts operate across the identical frequency range of 0 Hz to 18 GHz with 50 Ohm impedance matching. Frequency response characteristics are equivalent.

Q: What is the difference between ROHS3 and RoHS compliance?

A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 represents the current regulatory standard. Both parts meet environmental compliance requirements for manufacturing and distribution.

Q: Why does AT-109V have Last Time Buy status?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this product. Remaining inventory is available for purchase, but no future production is planned. This status does not affect electrical performance but impacts long-term supply availability.

Q: Can packaging format affect substitution eligibility?

A: Yes. The M3933/25-75S is supplied in Bag packaging while AT-109V is supplied in Bulk packaging. Both are SMA In-Line Module configurations suitable for identical installation methods. Packaging format does not affect electrical compatibility but may influence inventory management and handling procedures.

Q: What parameters must remain identical for substitution?

A: Frequency range, impedance, power rating, connector type, and package type must remain identical or compatible. Attenuation value may vary within acceptable engineering tolerance when all other parameters align.