R411804121 RF Attenuator SMA 4dB 18GHz 2W Equivalent & Substitute Parts

Part Overview

The R411804121 is an RF attenuator manufactured by Radiall USA, Inc., designed for in-line attenuation applications in RF and microwave systems. This SMA-connectorized module provides 4dB attenuation across a frequency range of 0 Hz to 18 GHz with 50-ohm impedance and 2-watt power handling capability. The part is currently in active production status and ROHS3 compliant. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits operation within reduced frequency or power specifications.

Key Parameters

Parameter	Value
Attenuation Value	4dB
Frequency Range	0 Hz ~ 18 GHz
Power Rating	2W
Impedance	50 Ohms
Package Type	SMA In-Line Module
Connector Type	SMA Male to SMA Female
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the R411804121 are classified based on matching the following critical parameters: attenuation value (4dB), impedance (50 ohms), package type (SMA In-Line Module), and power rating (2W). Frequency range compatibility is evaluated on a case-by-case basis, as some substitutes operate within reduced bandwidth while maintaining full attenuation and power specifications.

The substitute parts are grouped into two categories:

Full-Specification Equivalents: Parts matching all primary electrical parameters (4dB attenuation, 50-ohm impedance, 2W power, SMA in-line package) across the complete 0 Hz to 18 GHz frequency range or within reduced but compatible frequency bands.

Frequency-Limited Equivalents: Parts matching attenuation, impedance, power, and package specifications but with reduced frequency coverage (0 Hz to 4 GHz or 0 Hz to 6 GHz). These are suitable for applications operating below the frequency limitation.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Attenuation (dB)	Frequency Range (GHz)	Power (W)	Impedance (Ohms)	Package Type	RoHS Status	Product Status
R411804121	Radiall USA, Inc.	4	0 ~ 18	2	50	SMA In-Line Module	ROHS3 Compliant	Active
ATS-1M1F-04DB2W	Amphenol RF	4	0 ~ 6	2	50	SMA In-Line Module	ROHS3 Compliant	Active
CGA-1040-04-SMA-02	Cinch Connectivity Solutions	4	0 ~ 4	2	50	SMA In-Line Module	ROHS3 Compliant	Active
M3933/25-66N	Cinch Connectivity Solutions Midwest Microwave	4	0 ~ 18	Not Specified	Not Specified	SMA In-Line Module	RoHS Non-Compliant	Active
P1AT-SAMF-6G2W-4	P1dB Inc	4	0 ~ 6	2	50	SMA In-Line Module	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Equivalent: The M3933/25-66N provides full frequency range coverage (0 Hz to 18 GHz) matching the R411804121 specification. However, this part is RoHS non-compliant and carries military qualification (MIL-DTL-M3933). Selection of this part is appropriate for applications where RoHS compliance is not required and military-grade qualification is beneficial or required.

ROHS3-Compliant Alternatives: The ATS-1M1F-04DB2W (Amphenol RF) and P1AT-SAMF-6G2W-4 (P1dB Inc) both provide ROHS3 compliance, 4dB attenuation, 2W power handling, and 50-ohm impedance. Both are limited to 0 Hz to 6 GHz frequency range. These parts are suitable for applications operating below 6 GHz where RoHS compliance is mandatory.

Frequency-Constrained Option: The CGA-1040-04-SMA-02 (Cinch Connectivity Solutions) operates within 0 Hz to 4 GHz and is ROHS3 compliant. This part is suitable only for applications with maximum operating frequency of 4 GHz or lower.

All substitute parts maintain active production status and are available in commercial quantities.

Frequently Asked Questions (FAQ)

Q: Can the ATS-1M1F-04DB2W replace the R411804121 in all applications?

A: The ATS-1M1F-04DB2W is a direct substitute for applications operating at frequencies up to 6 GHz. Applications requiring operation above 6 GHz require the R411804121 or M3933/25-66N. Both parts provide identical 4dB attenuation, 2W power handling, and 50-ohm impedance within their respective frequency ranges.

Q: What is the difference between the M3933/25-66N and the R411804121?

A: Both parts provide 4dB attenuation across 0 Hz to 18 GHz in SMA in-line module packaging. The primary difference is RoHS compliance status: the R411804121 is ROHS3 compliant, while the M3933/25-66N is RoHS non-compliant. The M3933/25-66N carries military qualification per MIL-DTL-M3933. Power rating is not specified for the M3933/25-66N in available documentation.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use SMA in-line module packaging. Packaging material differs: the R411804121, ATS-1M1F-04DB2W, CGA-1040-04-SMA-02, and P1AT-SAMF-6G2W-4 are supplied in bulk packaging, while the M3933/25-66N is supplied in bag packaging. This distinction affects handling and storage but does not impact electrical performance.

Q: Which substitute part should be selected for a new design requiring RoHS compliance?

A: For applications operating up to 6 GHz, select either ATS-1M1F-04DB2W or P1AT-SAMF-6G2W-4, both ROHS3 compliant with 2W power handling. For applications requiring operation above 6 GHz with RoHS compliance, the R411804121 remains the appropriate selection.

Q: Can the CGA-1040-04-SMA-02 be used as a substitute?

A: The CGA-1040-04-SMA-02 is suitable only for applications with maximum operating frequency of 4 GHz. It provides 4dB attenuation, 2W power handling, and 50-ohm impedance within this frequency range and is ROHS3 compliant. Applications requiring operation above 4 GHz require alternative parts.

Q: What inventory levels are available for each substitute part?

A: Current inventory levels are: R411804121 (719 pcs), ATS-1M1F-04DB2W (861 pcs), CGA-1040-04-SMA-02 (1127 pcs), M3933/25-66N (1055 pcs), and P1AT-SAMF-6G2W-4 (921 pcs). All parts are listed as new original stock.

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