AT-109V RF Attenuator 9dB 50 Ohm SMA In-Line Module

Part Overview

The AT-109V is a 9dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for RF signal attenuation across 0 Hz to 18 GHz with 50 Ohm impedance and 2W power handling in an SMA in-line module package. This part is currently in Last Time Buy status, indicating production discontinuation. Equivalent substitute parts are necessary to ensure continued availability and supply chain continuity for applications requiring 9dB attenuation in the specified frequency and power range.

Key Parameters

Parameter	AT-109V Specification
Attenuation Value	9dB
Frequency Range	0 Hz ~ 18 GHz
Impedance	50 Ohms
Power (Watts)	2W
Package / Case	SMA In-Line Module
RoHS Status	RoHS Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the AT-109V is determined by the following critical parameters:

Primary Matching Criteria:

Attenuation Value: 9dB (exact match required)
Impedance: 50 Ohms (exact match required)
Package / Case: SMA In-Line Module (exact match required)

Secondary Compatibility Criteria:

Frequency Range: Must cover or exceed 0 Hz ~ 18 GHz
Power Rating: Must meet or exceed 2W

Substitute parts are grouped based on their ability to satisfy these criteria. Parts with identical attenuation, impedance, and package specifications are considered direct parametric equivalents. Parts with frequency range or power rating variations are noted for application-specific evaluation.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Attenuation Value	Frequency Range	Power (Watts)	Impedance	Package / Case	Product Status	RoHS Status
AT-109V	Hirose Electric Co Ltd	9dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	Last Time Buy	RoHS Compliant
M3933/14-12N	Cinch Connectivity Solutions Midwest Microwave	9dB	0 Hz ~ 12.4 GHz	Not Specified	50 Ohms	SMA In-Line Module	Active	RoHS non-compliant
M3933/16-11N	Cinch Connectivity Solutions Midwest Microwave	9dB	0 Hz ~ 18 GHz	Not Specified	50 Ohms	SMA In-Line Module	Active	RoHS non-compliant
M3933/16-11S	Cinch Connectivity Solutions Midwest Microwave	9dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	Active	RoHS non-compliant
M3933/16-26N	Cinch Connectivity Solutions Midwest Microwave	9.5dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	Active	RoHS non-compliant
M3933/16-26S	Cinch Connectivity Solutions Midwest Microwave	9.5dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	Active	RoHS non-compliant
M3933/25-09N	Cinch Connectivity Solutions Midwest Microwave	9dB	0 Hz ~ 2 GHz	2W	50 Ohms	SMA In-Line Module	Active	RoHS non-compliant

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical and Mechanical Specifications):

M3933/16-11S is the closest functional equivalent to AT-109V, matching all critical parameters: 9dB attenuation, 0 Hz ~ 18 GHz frequency range, 2W power rating, 50 Ohm impedance, and SMA in-line module package. This part is in Active product status with current inventory availability. The primary difference is RoHS compliance status; AT-109V is RoHS compliant while M3933/16-11S is RoHS non-compliant. Selection should account for end-application regulatory requirements.

Parametric Equivalents with Full Frequency Coverage:

M3933/16-11N provides identical attenuation (9dB), frequency range (0 Hz ~ 18 GHz), impedance (50 Ohms), and package specifications. Power rating is not specified in available data. This part is Active status with 761 units in stock. Suitable for applications where power rating specification is not critical or where 2W capability is not required.

Limited Frequency Range Substitute:

M3933/14-12N matches attenuation (9dB) and impedance (50 Ohms) but operates only to 12.4 GHz, limiting its use to applications not requiring full 18 GHz coverage. Power rating is not specified. This part is Active status. Selection is appropriate only for applications with maximum frequency requirements below 12.4 GHz.

Attenuation Tolerance Alternatives:

M3933/16-26N and M3933/16-26S provide 9.5dB attenuation instead of 9dB, with full 0 Hz ~ 18 GHz frequency coverage, 2W power rating, and 50 Ohm impedance. These parts are Active status. Selection requires confirmation that 0.5dB attenuation variance is acceptable for the application.

Restricted Frequency Range Substitute:

M3933/25-09N is limited to 0 Hz ~ 2 GHz frequency range, making it unsuitable for broadband RF applications requiring 18 GHz coverage. Selection is appropriate only for low-frequency applications below 2 GHz.

Frequently Asked Questions (FAQ)

Q: Can M3933/16-11S directly replace AT-109V in all applications?

A: M3933/16-11S matches all electrical and mechanical parameters of AT-109V (9dB, 0 Hz ~ 18 GHz, 2W, 50 Ohms, SMA in-line module). The primary consideration is RoHS compliance status. AT-109V is RoHS compliant while M3933/16-11S is RoHS non-compliant. Verify your application's regulatory requirements before substitution.

Q: What is the difference between M3933/16-11N and M3933/16-11S?

A: Both parts provide 9dB attenuation across 0 Hz ~ 18 GHz with 50 Ohm impedance in SMA in-line module package. M3933/16-11S specifies 2W power rating, while M3933/16-11N does not provide power rating specification in available data. For applications requiring confirmed 2W capability, M3933/16-11S is the appropriate selection.

Q: Why is M3933/14-12N listed as a substitute if it only covers 12.4 GHz?

A: M3933/14-12N is a parametric equivalent for applications with maximum frequency requirements at or below 12.4 GHz. It matches attenuation (9dB) and impedance (50 Ohms) specifications. Selection is appropriate only when full 18 GHz coverage is not required.

Q: Can I use M3933/16-26N or M3933/16-26S as replacements for AT-109V?

A: M3933/16-26N and M3933/16-26S provide 9.5dB attenuation instead of 9dB. All other parameters match AT-109V (0 Hz ~ 18 GHz, 2W, 50 Ohms, SMA in-line module). Substitution is valid only if 0.5dB attenuation variance is acceptable for your application's signal processing requirements.

Q: Are all substitute parts available in the same packaging as AT-109V?

A: All listed substitute parts use SMA in-line module package, matching AT-109V mechanical form factor. Packaging format differs: AT-109V is supplied in Bulk packaging, while Cinch Connectivity Solutions substitutes are supplied in Bag packaging. Verify packaging requirements for your procurement and assembly processes.

Q: What should I consider when selecting between available substitutes?

A: Prioritize based on: (1) Frequency range coverage required by your application, (2) Power rating requirements, (3) Attenuation tolerance specifications, (4) RoHS compliance requirements, (5) Product status and inventory availability. M3933/16-11S is recommended as the primary substitute when all parameters must match AT-109V exactly.

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