R413820121 RF Attenuator SMA 20dB 26.5GHz Equivalent & Substitute Parts

Part Overview

The R413820121 is an RF attenuator manufactured by Radiall USA, Inc., designed for in-line SMA applications. This component provides 20dB attenuation across a frequency range of 0 Hz to 26.5 GHz with 2W power handling capability and 50 Ohm impedance. The part is currently active in production with 1044 units in stock.

Substitute parts are necessary when the original component becomes unavailable, when alternative packaging formats are required, or when application frequency requirements differ from the primary specification. Equivalent parts maintain the core electrical parameters (20dB attenuation, 2W power rating, 50 Ohm impedance, SMA connector configuration) while potentially varying in frequency range, manufacturer, or packaging format.

Key Parameters

Parameter	Value
Attenuation Value	20dB
Frequency Range	0 Hz ~ 26.5 GHz
Power Rating	2W
Impedance	50 Ohms
Connector Type	SMA In-Line Module
Manufacturer	Radiall USA, Inc.
Product Status	Active
Packaging	Bulk

Substitute Part Grouping Explanation

Substitution eligibility for the R413820121 is determined by the following critical parameters:

Primary Matching Criteria:

Attenuation Value: 20dB (exact match required)
Power Rating: 2W (exact match required)
Impedance: 50 Ohms (exact match required)
Connector Type: SMA In-Line Module (exact match required)

Secondary Consideration:

Frequency Range: The R413820121 operates to 26.5 GHz. Substitute parts with lower maximum frequency ratings (18 GHz, 6 GHz, or 4 GHz) are functionally equivalent for applications operating within their specified frequency limits. Parts with frequency ranges below the application requirement are not suitable.

All substitute parts listed maintain the four primary matching criteria. Frequency range variations reflect different application requirements and do not affect substitution validity for frequency-compatible applications.

Parameter Comparison

Part Number	Manufacturer	Attenuation	Frequency Range	Power (W)	Impedance (Ω)	Connector	Packaging	Product Status
R413820121	Radiall USA, Inc.	20dB	0 Hz ~ 26.5 GHz	2W	50	SMA In-Line Module	Bulk	Active
R411820121	Radiall USA, Inc.	20dB	0 Hz ~ 18 GHz	2W	50	SMA In-Line Module	Box	Active
R413820000	Radiall USA, Inc.	20dB	0 Hz ~ 18 GHz	2W	50	SMA In-Line Module	Bulk	Active
R413820115	Radiall USA, Inc.	20dB	0 Hz ~ 4 GHz	2W	50	SMA In-Line Module	Bulk	Active
M3933/25-88N	Cinch Connectivity Solutions Midwest Microwave	20dB	0 Hz ~ 18 GHz	Not Specified	Not Specified	SMA In-Line Module	Bag	Active
P1AT-SAMF-18G2W-20	P1dB Inc	20dB	0 Hz ~ 18 GHz	2W	50	SMA In-Line Module	Bulk	Active
P1AT-SAMF-6G2W-20	P1dB Inc	20dB	0 Hz ~ 6 GHz	2W	50	SMA In-Line Module	Bulk	Active
SA18E-20	Fairview Microwave	20dB	0 Hz ~ 18 GHz	2W	50	SMA In-Line Module	Bulk	Active
SA18H-20	Fairview Microwave	20dB	0 Hz ~ 18 GHz	2W	50	SMA In-Line Module	Bulk	Active
SA6HA-20	Fairview Microwave	20dB	0 Hz ~ 6 GHz	2W	50	SMA In-Line Module	Bulk	Active
SF0929-6200-20	Amphenol SV Microwave	20dB	0 Hz ~ 18 GHz	2W	50	SMA In-Line Module	Bulk	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and are suitable for direct substitution within their specified frequency ranges. Selection criteria are based on application frequency requirements and compliance certifications.

Radiall USA, Inc. Substitutes:

R411820121 and R413820000 are Radiall products with identical electrical specifications to the primary part, differing only in frequency range (18 GHz maximum) and packaging format. Both are ROHS3 compliant and REACH affected.
R413820115 operates to 4 GHz maximum and is suitable for low-frequency applications requiring Radiall sourcing.

Multi-Manufacturer Substitutes (18 GHz Frequency Range):

P1AT-SAMF-18G2W-20 (P1dB Inc), SA18E-20 and SA18H-20 (Fairview Microwave), and SF0929-6200-20 (Amphenol SV Microwave) all provide equivalent electrical performance to 18 GHz. These parts are ROHS3 compliant with active product status.
M3933/25-88N (Cinch Connectivity Solutions) is MIL-DTL-M3933 qualified and RoHS non-compliant, suitable for military applications where qualification is required.

Lower Frequency Substitutes (6 GHz and 4 GHz):

P1AT-SAMF-6G2W-20 and SA6HA-20 operate to 6 GHz maximum and are suitable for applications not requiring extended frequency coverage.
R413820115 operates to 4 GHz maximum for narrowband applications.

Packaging Considerations:

R411820121 is supplied in Box packaging; all other substitutes are supplied in Bulk, Bag, or equivalent formats.

Frequently Asked Questions (FAQ)

Q: Can I substitute an 18 GHz attenuator for the 26.5 GHz R413820121?

A: Yes, if your application operates at frequencies not exceeding 18 GHz. The 18 GHz parts (R411820121, R413820000, P1AT-SAMF-18G2W-20, SA18E-20, SA18H-20, SF0929-6200-20, and M3933/25-88N) maintain all electrical parameters (20dB attenuation, 2W power, 50 Ohm impedance, SMA connector) and are functionally equivalent within their frequency specification. If your application requires operation above 18 GHz, these parts are not suitable.

Q: What is the difference between R413820121 and R413820000?

A: Both are Radiall products with identical electrical specifications (20dB, 2W, 50 Ohm, SMA). The primary differences are frequency range (R413820121 to 26.5 GHz versus R413820000 to 18 GHz) and packaging (Bulk for both). R413820000 is suitable for applications operating to 18 GHz maximum.

Q: Are there compliance differences between substitute parts?

A: Yes. Most substitutes are ROHS3 compliant. M3933/25-88N is RoHS non-compliant but is MIL-DTL-M3933 qualified for military applications. P1dB Inc parts are REACH unaffected, while Radiall and most other manufacturers' parts are REACH affected. Verify compliance requirements for your specific application.

Q: Can I use a 6 GHz attenuator in place of the R413820121?

A: Only if your application operates exclusively at frequencies not exceeding 6 GHz. Parts with 6 GHz maximum frequency (P1AT-SAMF-6G2W-20 and SA6HA-20) are not suitable for applications requiring operation above 6 GHz.

Q: What is the difference between Fairview Microwave SA18E-20 and SA18H-20?

A: Both parts are electrically identical (20dB, 0 Hz ~ 18 GHz, 2W, 50 Ohm, SMA In-Line Module) with ROHS3 compliance and active product status. The designation difference (E versus H) reflects connector gender configuration. Verify connector orientation requirements for your application.

Q: Is M3933/25-88N suitable for commercial applications?

A: M3933/25-88N is MIL-DTL-M3933 qualified and RoHS non-compliant, making it suitable for military and aerospace applications where military qualification is required. For commercial applications requiring ROHS3 compliance, select from the compliant alternatives listed.

Q: What packaging formats are available?

A: The R413820121 is supplied in Bulk packaging. Substitutes are available in Bulk (most common), Box (R411820121), and Bag (M3933/25-88N) formats. Packaging format does not affect electrical performance or substitution eligibility.

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