RF Attenuator M3933/30-27S Equivalent & Substitute Parts

Part Overview

The M3933/30-27S is an RF attenuator manufactured by Amphenol SV Microwave, designed for inline attenuation applications across microwave and millimeter-wave frequency ranges. This component provides 14 dB of attenuation with 50-ohm impedance matching and 2-watt power handling capability in an SMA connector configuration. The part is currently in active production status with 1086 units available in inventory.

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit operation within alternative electrical specifications. The AT-115V from Hirose Electric Co Ltd represents a parametrically related alternative, though with specific differences in attenuation value and maximum frequency capability that must be evaluated for application compatibility.

Substiute Parts

M3933/30-27S

Amphenol SV MicrowaveIn Stock: 1135M3933/30-27S Datasheet

Current PartRFQ

AT-115V

Hirose Electric Co LtdIn Stock: 1055AT-115V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for RF attenuators is determined by the following critical parameters:

Mandatory Matching Parameters:

• Impedance: 50 Ohms (both parts)
• Connector Type: SMA In-Line Module (both parts)
• Power Rating: 2 W (both parts)
• ECCN Classification: EAR99 (both parts)

Variable Parameters Affecting Substitution:

• Attenuation Value: M3933/30-27S provides 14 dB; AT-115V provides 15 dB
• Frequency Range: M3933/30-27S operates 0 Hz ~ 32 GHz; AT-115V operates 0 Hz ~ 18 GHz
• Product Status: M3933/30-27S is Active; AT-115V is Last Time Buy
• RoHS Status: M3933/30-27S is ROHS3 Compliant; AT-115V is RoHS Compliant

The AT-115V qualifies as a substitute based on matching impedance, connector type, and power handling. However, the 1 dB difference in attenuation and the reduced frequency range to 18 GHz represent functional limitations that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Component (M3933/30-27S): The M3933/30-27S is the recommended selection for new designs and ongoing production. This component maintains Active product status, ensuring long-term availability and supply chain stability. ROHS3 compliance exceeds baseline environmental requirements. The 32 GHz frequency capability provides operational margin for applications requiring operation across extended frequency ranges. Current inventory of 1086 units supports immediate procurement.

Substitute Component (AT-115V): The AT-115V is suitable for applications where the following conditions are met: (1) operating frequency does not exceed 18 GHz, (2) the 15 dB attenuation value is acceptable or beneficial to the circuit design, and (3) supply of the primary component is unavailable. The Last Time Buy status indicates this component will not receive future production runs; procurement should be limited to immediate requirements only. RoHS compliance is maintained, though at a lower certification level than the primary part.

Substitution Constraints: Applications requiring operation above 18 GHz cannot use the AT-115V. Circuits designed for precisely 14 dB attenuation require evaluation of the 1 dB increase provided by the substitute. The Last Time Buy status of AT-115V makes it unsuitable for long-term production planning.

Frequently Asked Questions (FAQ)

Q: Can AT-115V be used as a direct replacement for M3933/30-27S in all applications?

A: No. The AT-115V has a maximum frequency rating of 18 GHz compared to 32 GHz for the M3933/30-27S. Applications operating above 18 GHz require the primary component. Additionally, the 1 dB higher attenuation (15 dB vs. 14 dB) must be evaluated for circuit compatibility.

Q: What is the significance of the Last Time Buy status for AT-115V?

A: Last Time Buy indicates that Hirose Electric Co Ltd will not manufacture additional units of AT-115V beyond current inventory. This part should only be selected for immediate, short-term requirements. For ongoing production or future applications, the M3933/30-27S is the appropriate choice.

Q: Are the SMA connectors on both parts physically identical?

A: Both parts use SMA In-Line Module connectors. Physical compatibility is confirmed. However, electrical performance differences in attenuation and frequency range remain independent of connector compatibility.

Q: Does the difference in RoHS compliance levels affect substitution eligibility?

A: Both parts meet RoHS compliance requirements. The M3933/30-27S achieves ROHS3 certification, which represents a higher compliance standard than the RoHS compliance of AT-115V. For applications with ROHS3 requirements, only the M3933/30-27S is acceptable.

Q: What impedance matching is required for these attenuators?

A: Both the M3933/30-27S and AT-115V are rated for 50-ohm systems. They must be installed in 50-ohm transmission line environments. Impedance matching is a mandatory requirement for both parts.

Q: Can AT-115V handle the same power levels as M3933/30-27S?

A: Yes. Both components are rated for 2-watt power handling. Power capability is matched between the primary and substitute parts.

Q: What export restrictions apply to these components?

A: Both parts are classified under ECCN EAR99, which permits export under standard commercial licensing procedures. No additional export documentation is required beyond standard commercial practices.