RF Attenuator 20dB 50 Ohm SMA M3933/30-33S Equivalent & Substitute Parts

Part Overview

The M3933/30-33S is an RF attenuator manufactured by Amphenol SV Microwave, designed for in-line RF signal attenuation applications. This component provides 20dB attenuation across a frequency range of 0 Hz to 32 GHz with 50 Ohm impedance and 2W power handling capability in an SMA connector configuration. The part is currently in Active product status. Identifying equivalent and substitute parts is necessary to ensure supply chain continuity, evaluate alternative sourcing options, and confirm compatibility with system requirements based on electrical and mechanical specifications.

Substiute Parts

M3933/30-33S

Amphenol SV MicrowaveIn Stock: 724M3933/30-33S Datasheet

Current PartRFQ

AT-120V

Hirose Electric Co LtdIn Stock: 775AT-120V Datasheet

Parametric EquivalentRFQ

LCAT1001-20

L-comIn Stock: 1109LCAT1001-20 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the M3933/30-33S are identified based on matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Attenuation Value: 20dB (exact match required)
• Power Rating: 2W (exact match required)
• Impedance: 50 Ohms (exact match required)
• Package / Case: SMA In-Line Module (exact match required)
• RoHS Status: ROHS3 Compliant (compliance requirement)

Secondary Consideration:

• Frequency Range: Substitutes may operate within a subset of the main part's frequency range (0 Hz ~ 32 GHz), provided the substitute's frequency range encompasses the application requirements

The substitute parts AT-120V and LCAT1001-20 satisfy the primary matching criteria. Frequency range differences exist and must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

M3933/30-33S (Primary Part): Active product status with full frequency range coverage to 32 GHz. ROHS3 compliant. Recommended for new designs and applications requiring the complete 0 Hz to 32 GHz frequency range.

AT-120V (Hirose Electric Co Ltd): Designated as Last Time Buy status. Frequency range limited to 0 Hz ~ 18 GHz. ROHS3 compliant. Suitable for applications operating within the 0 Hz to 18 GHz band. Supply availability is limited due to Last Time Buy status.

LCAT1001-20 (L-com): Active product status. Frequency range limited to 0 Hz ~ 3 GHz. ROHS3 compliant. Suitable only for applications operating within the 0 Hz to 3 GHz band. Recommended for low-frequency RF applications where the reduced frequency range is acceptable.

All three parts meet the core electrical specifications of 20dB attenuation, 2W power handling, and 50 Ohm impedance in SMA In-Line Module configuration. Selection between substitutes depends on application frequency requirements and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can AT-120V be used as a direct replacement for M3933/30-33S?

A: AT-120V matches all primary electrical and mechanical parameters (20dB attenuation, 2W power, 50 Ohm impedance, SMA In-Line Module package). However, AT-120V operates only to 18 GHz versus the M3933/30-33S operating to 32 GHz. Substitution is valid only if the application operates within the 0 Hz to 18 GHz frequency range. Additionally, AT-120V is designated Last Time Buy, limiting future availability.

Q: Is LCAT1001-20 suitable for high-frequency applications?

A: LCAT1001-20 is limited to 0 Hz ~ 3 GHz frequency range. It is not suitable for applications requiring operation above 3 GHz. This part is appropriate only for DC to 3 GHz RF applications.

Q: What are the packaging differences between these parts?

A: M3933/30-33S and LCAT1001-20 are supplied in Bag packaging. AT-120V is supplied in Bulk packaging. Packaging type does not affect electrical performance but may impact inventory management and handling procedures.

Q: Are all three parts RoHS3 compliant?

A: Yes, M3933/30-33S, AT-120V, and LCAT1001-20 are all ROHS3 compliant, meeting environmental and regulatory requirements.

Q: What is the significance of AT-120V being Last Time Buy?

A: Last Time Buy status indicates that Hirose Electric Co Ltd will discontinue production of AT-120V. Existing inventory may be available, but future procurement will not be possible. This status affects long-term supply chain planning and should be considered when selecting substitutes for new designs.

Q: Do all parts have the same impedance and power rating?

A: Yes, all three parts (M3933/30-33S, AT-120V, and LCAT1001-20) share identical impedance (50 Ohms) and power rating (2W), ensuring electrical compatibility within their respective frequency ranges.