R413810121 RF Attenuator SMA 10dB 26.5GHz Equivalent & Substitute Parts

Part Overview

The R413810121 is an RF attenuator manufactured by Radiall USA, Inc., designed for inline attenuation applications across a broad frequency range. This SMA-connectorized module provides 10dB attenuation with 2W power handling capability and 50-ohm impedance, operating from DC to 26.5 GHz. The part is currently active in production status and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance is required within specific frequency and power constraints, or when alternative connector types or frequency ranges are acceptable for the application.

Key Parameters

Parameter	Value
Manufacturer Part Number	R413810121
Manufacturer	Radiall USA, Inc.
Attenuation Value	10dB
Frequency Range	0 Hz ~ 26.5 GHz
Power Rating	2W
Impedance	50 Ohms
Package / Case	SMA In-Line Module
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the R413810121 are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Attenuation Value: 10dB (fixed across all substitutes)
Impedance: 50 Ohms (fixed across all substitutes)
Power Rating: 2W (fixed across all substitutes)
Connector Type: SMA In-Line Module (primary group) or alternative connectors (secondary group)

Frequency Range Considerations: Substitutes are organized by maximum frequency capability. The R413810121 operates to 26.5 GHz. Substitutes with lower frequency limits (4 GHz, 6 GHz, 18 GHz) are suitable for applications not requiring the full 26.5 GHz bandwidth. The P1AT-29MF-40G2W-10 extends to 40 GHz and is suitable for higher-frequency applications.

Connector Type Variations: All listed substitutes maintain SMA connectors except P1AT-29MF-40G2W-10, which uses 2.92mm connectors. The 2.92mm connector is mechanically and electrically compatible with SMA in many applications but represents a different physical interface.

Compliance and Qualification: Most substitutes are ROHS3 compliant. The M3933/25-78N and M3933/25-78S are qualified to MIL-DTL-M3933 military specification, with M3933/25-78S matching the RoHS non-compliant status of the main part in that product line.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Attenuation (dB)	Frequency Range (GHz)	Power (W)	Impedance (Ohms)	Connector Type	RoHS Status	Product Status
R413810121	Radiall USA, Inc.	10	0 ~ 26.5	2	50	SMA In-Line	ROHS3	Active
R411810121	Radiall USA, Inc.	10	0 ~ 18	2	50	SMA In-Line	ROHS3	Active
R413810115	Radiall USA, Inc.	10	0 ~ 4	2	50	SMA In-Line	RoHS	Active
ATS-1M1F-10DB2W	Amphenol RF	10	0 ~ 6	2	50	SMA In-Line	ROHS3	Active
M3933/25-78N	Cinch Connectivity Solutions Midwest Microwave	10	0 ~ 18	Not Specified	Not Specified	SMA In-Line	RoHS non-compliant	Active
M3933/25-78S	Cinch Connectivity Solutions Midwest Microwave	10	0 ~ 18	2	50	SMA In-Line	RoHS non-compliant	Active
P1AT-29MF-40G2W-10	P1dB Inc	10	0 ~ 40	2	50	2.92mm In-Line	ROHS3	Active
P1AT-SAMF-18G2W-10	P1dB Inc	10	0 ~ 18	2	50	SMA In-Line	ROHS3	Active
P1AT-SAMF-6G2W-10	P1dB Inc	10	0 ~ 6	2	50	SMA In-Line	ROHS3	Active
SA18E-10	Fairview Microwave	10	0 ~ 18	2	50	SMA In-Line	ROHS3	Active
SA18H-10	Fairview Microwave	10	0 ~ 18	2	50	SMA In-Line	ROHS3	Active

Engineering Selection Recommendations

Full Frequency Range Equivalents (0 ~ 26.5 GHz): The R413810121 is the only part in this list with full 26.5 GHz capability. No direct equivalent exists among the substitutes. Selection of a lower-frequency substitute requires confirmation that the application does not require operation above the substitute's maximum frequency.

Extended Frequency Range (0 ~ 40 GHz): The P1AT-29MF-40G2W-10 from P1dB Inc exceeds the frequency range of the main part and is suitable for applications requiring operation to 40 GHz. This part uses 2.92mm connectors rather than SMA, requiring adapter consideration or system redesign.

18 GHz Frequency Range Substitutes: R411810121 (Radiall), M3933/25-78S (Cinch), P1AT-SAMF-18G2W-10 (P1dB), SA18E-10 (Fairview), and SA18H-10 (Fairview) all operate to 18 GHz with 10dB attenuation, 2W power, and 50-ohm impedance in SMA packages. All are active products. R411810121 and P1AT-SAMF-18G2W-10 are ROHS3 compliant. M3933/25-78S is RoHS non-compliant but MIL-DTL-M3933 qualified. SA18E-10 and SA18H-10 are ROHS3 compliant.

6 GHz Frequency Range Substitutes: ATS-1M1F-10DB2W (Amphenol RF) and P1AT-SAMF-6G2W-10 (P1dB) operate to 6 GHz with matching electrical specifications. Both are ROHS3 compliant and active products.

Low Frequency Range (0 ~ 4 GHz): R413810115 from Radiall operates to 4 GHz only and is suitable for DC to 4 GHz applications requiring 10dB attenuation.

Military Qualification: M3933/25-78N and M3933/25-78S are MIL-DTL-M3933 qualified. M3933/25-78S provides full electrical specification matching (10dB, 2W, 50 ohms, 18 GHz) with military qualification but is RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute with a lower maximum frequency than the R413810121?

A: Yes, if your application operates only within the lower frequency range. For example, if your system operates only to 18 GHz, any 18 GHz rated substitute is functionally equivalent. Verify that your application's maximum operating frequency does not exceed the substitute's rated frequency limit.

Q: What is the difference between the SMA and 2.92mm connector versions?

A: The P1AT-29MF-40G2W-10 uses 2.92mm connectors instead of SMA. While both are precision RF connectors, they have different physical interfaces. Direct substitution requires either mechanical adapters or system redesign. The 2.92mm connector is typically used in higher-frequency applications and provides superior performance to 40 GHz.

Q: Are all substitutes ROHS3 compliant like the main part?

A: No. Most substitutes are ROHS3 compliant, but M3933/25-78N and M3933/25-78S are RoHS non-compliant. If RoHS3 compliance is required, select from R411810121, ATS-1M1F-10DB2W, P1AT-29MF-40G2W-10, P1AT-SAMF-18G2W-10, P1AT-SAMF-6G2W-10, SA18E-10, or SA18H-10.

Q: Which substitute offers the broadest frequency coverage?

A: The P1AT-29MF-40G2W-10 operates to 40 GHz, exceeding the R413810121's 26.5 GHz range. This part is suitable for applications requiring extended high-frequency performance but uses 2.92mm connectors.

Q: Can I use M3933/25-78N instead of M3933/25-78S?

A: M3933/25-78N does not specify power rating or impedance in the provided data. M3933/25-78S explicitly specifies 2W power and 50-ohm impedance, matching the R413810121. Use M3933/25-78S for confirmed electrical equivalence.

Q: What is the inventory status of these substitutes?

A: All listed substitutes are in active production with current inventory. Inventory quantities range from 18 to 1119 pieces across different part numbers, indicating availability for procurement.

Q: Are Fairview Microwave SA18E-10 and SA18H-10 interchangeable?

A: Both SA18E-10 and SA18H-10 share identical electrical specifications (10dB, 0 ~ 18 GHz, 2W, 50 ohms, SMA, ROHS3). The designation difference (E versus H) may indicate internal design variations or connector gender differences. Verify connector gender compatibility with your application before substitution.

Q: Which substitute is best for military applications?

A: M3933/25-78S is MIL-DTL-M3933 qualified and provides full electrical specification matching (10dB, 2W, 50 ohms, 18 GHz). This part is suitable for military procurement requirements, though it is RoHS non-compliant.

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