AT-111V RF Attenuator 11dB 50 Ohm SMA Equivalent & Substitute Parts

Part Overview

The AT-111V is an RF attenuator manufactured by Hirose Electric Co Ltd, rated for 11dB attenuation across 0 Hz to 18 GHz with 50 Ohm impedance and 2W power handling in an SMA in-line module package. This part carries Last Time Buy status, indicating limited availability. Equivalent and substitute parts are identified based on matching electrical specifications: attenuation value, frequency range, impedance, power rating, and package type.

Key Parameters

Parameter	AT-111V Specification
Attenuation Value	11dB
Frequency Range	0 Hz ~ 18 GHz
Impedance	50 Ohms
Power (Watts)	2W
Package / Case	SMA In-Line Module
Manufacturer	Hirose Electric Co Ltd
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the AT-111V are grouped based on the following substitution criteria:

Primary Match (Identical Specifications): Parts matching all five core electrical and mechanical parameters: 11dB attenuation, 0 Hz ~ 18 GHz frequency range, 50 Ohm impedance, 2W power rating, and SMA in-line module package.

Secondary Match (Frequency Range Limitation): Parts with 11dB attenuation, 50 Ohm impedance, and SMA package but limited to 0 Hz ~ 12.4 GHz frequency range. These are suitable for applications not requiring full 18 GHz bandwidth.

Tertiary Match (Attenuation Variance): Parts with 12dB attenuation instead of 11dB, maintaining 50 Ohm impedance and SMA package. These introduce 1dB additional loss and are suitable only where attenuation tolerance permits.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Attenuation Value	Frequency Range	Power (Watts)	Impedance	Package / Case	RoHS Status	Product Status	Inventory
AT-111V	Hirose Electric Co Ltd	11dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	RoHS Compliant	Last Time Buy	967 Pcs
M3933/16-28N	Cinch Connectivity Solutions Midwest Microwave	11dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	RoHS non-compliant	Active	925 Pcs
M3933/16-28S	Cinch Connectivity Solutions Midwest Microwave	11dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	RoHS non-compliant	Active	933 Pcs
M3933/14-22N	Cinch Connectivity Solutions Midwest Microwave	11dB	0 Hz ~ 12.4 GHz	Not Specified	50 Ohms	SMA In-Line Module	RoHS non-compliant	Active	795 Pcs
AT-112V	Hirose Electric Co Ltd	12dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	RoHS Compliant	Last Time Buy	920 Pcs
M3933/16-30N	Cinch Connectivity Solutions Midwest Microwave	12dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	RoHS non-compliant	Active	698 Pcs
M3933/14-21N	Cinch Connectivity Solutions Midwest Microwave	12dB	0 Hz ~ 12.4 GHz	Not Specified	50 Ohms	SMA In-Line Module	RoHS non-compliant	Active	722 Pcs
M3933/14-21S	Cinch Connectivity Solutions Midwest Microwave	12dB	0 Hz ~ 12.4 GHz	Not Specified	50 Ohms	SMA In-Line Module	RoHS non-compliant	Active	845 Pcs

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical and Mechanical Specifications):

M3933/16-28N and M3933/16-28S are direct functional equivalents to AT-111V, matching all core parameters: 11dB attenuation, 0 Hz ~ 18 GHz frequency range, 2W power rating, 50 Ohm impedance, and SMA in-line module package. Both parts are in Active product status with higher inventory availability than AT-111V. Selection between these two variants depends on packaging requirements (Bag packaging for both). RoHS compliance differs: AT-111V is RoHS Compliant while M3933/16-28N and M3933/16-28S are RoHS non-compliant. This distinction is critical for applications subject to RoHS regulations.

Limited Frequency Range Substitutes:

M3933/14-22N provides 11dB attenuation with 50 Ohm impedance and SMA package but operates only to 12.4 GHz instead of 18 GHz. This part is suitable for applications with frequency requirements below 12.4 GHz. Power rating is not specified for this part.

Attenuation Variance Substitutes:

AT-112V (Hirose Electric Co Ltd) and M3933/16-30N (Cinch Connectivity Solutions Midwest Microwave) both provide 12dB attenuation instead of 11dB, introducing 1dB additional loss. AT-112V maintains RoHS Compliance and matches the 0 Hz ~ 18 GHz frequency range and 2W power rating. M3933/16-30N also covers 0 Hz ~ 18 GHz with 2W power but is RoHS non-compliant. These parts are suitable only where circuit design tolerates the additional 1dB attenuation.

Limited Frequency and Attenuation Variance:

M3933/14-21N and M3933/14-21S provide 12dB attenuation with frequency range limited to 0 Hz ~ 12.4 GHz. These parts represent the greatest deviation from AT-111V specifications and are suitable only for narrowband applications below 12.4 GHz where 12dB attenuation is acceptable.

Frequently Asked Questions (FAQ)

Q: Can M3933/16-28N or M3933/16-28S be used as direct replacements for AT-111V?

A: Yes. Both parts match all electrical specifications (11dB attenuation, 0 Hz ~ 18 GHz, 2W, 50 Ohms) and mechanical package (SMA in-line module). The primary consideration is RoHS compliance: AT-111V is RoHS Compliant while the M3933 variants are RoHS non-compliant. Verify RoHS requirements for your application before substitution.

Q: What is the difference between M3933/16-28N and M3933/16-28S?

A: Both parts are electrically and mechanically identical with matching specifications. The suffix designations (N vs. S) indicate internal manufacturing or configuration variants. Consult the manufacturer for specific differences if critical to your application.

Q: Can I use AT-112V (12dB) instead of AT-111V (11dB)?

A: AT-112V introduces 1dB additional attenuation. Substitution is possible only if your circuit design tolerates this additional loss. Verify signal level requirements and gain margins before substitution.

Q: Are M3933/14-22N or M3933/14-21N suitable for my application?

A: These parts operate only to 12.4 GHz, compared to AT-111V's 18 GHz range. They are suitable only if your application requires frequencies no higher than 12.4 GHz. If your system requires full 18 GHz bandwidth, these parts are not suitable.

Q: What is the impact of RoHS non-compliance for the M3933 series?

A: RoHS non-compliance indicates these parts may contain restricted substances (lead, cadmium, mercury, etc.). Selection depends on regulatory requirements for your end application. If RoHS compliance is mandatory, use AT-111V or AT-112V (both RoHS Compliant).

Q: How do I choose between multiple substitute options?

A: Prioritize based on: (1) Frequency range requirement—select parts covering your full bandwidth; (2) Attenuation tolerance—select 11dB if possible, 12dB only if circuit permits; (3) RoHS compliance—select compliant parts if required by regulation; (4) Availability—all listed substitutes have adequate inventory.

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