AT-112V RF Attenuator 12dB 50 Ohm SMA In-Line Module

Part Overview

The AT-112V is a 12dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for 50 ohm impedance systems operating across 0 Hz to 18 GHz with 2W power handling capability in an SMA in-line module package. This component is classified as Last Time Buy, indicating limited availability. Equivalent and substitute parts are necessary to ensure design flexibility, supply chain continuity, and compatibility with alternative sourcing strategies when the primary part reaches end-of-life status.

Key Parameters

Parameter	Value
Attenuation Value	12dB
Frequency Range	0 Hz ~ 18 GHz
Impedance	50 Ohms
Power Rating	2W
Package / Case	SMA In-Line Module
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT-112V is determined by the following critical parameters:

Primary Matching Criteria:

Attenuation Value: 12dB (exact match required)
Impedance: 50 Ohms (exact match required)
Package / Case: SMA In-Line Module (exact match required)
Frequency Range: 0 Hz ~ 18 GHz (minimum coverage required)
Power Rating: 2W (minimum requirement)

Substitute Categories:

Category 1: Full Electrical and Mechanical Equivalents (0 Hz ~ 18 GHz, 2W) Parts meeting all primary criteria with identical frequency range and power rating:

M3933/16-30N (Cinch Connectivity Solutions Midwest Microwave)
M3933/16-30S (Cinch Connectivity Solutions Midwest Microwave)

Category 2: Frequency-Limited Equivalents (0 Hz ~ 12.4 GHz) Parts matching attenuation, impedance, and package but with reduced frequency coverage:

M3933/14-21N (Cinch Connectivity Solutions Midwest Microwave)
M3933/14-21S (Cinch Connectivity Solutions Midwest Microwave)

Category 3: Attenuation Variants (12.5dB) Parts with full frequency and power specifications but different attenuation value:

M3933/16-31N (Cinch Connectivity Solutions Midwest Microwave)

Parameter Comparison

Part Number	Manufacturer	Attenuation	Frequency Range	Power (W)	Impedance	Package	RoHS Status	Product Status	Inventory
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
M3933/16-30S	Cinch Connectivity Solutions Midwest Microwave	12dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	RoHS Non-compliant	Active	1015 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
M3933/16-31N	Cinch Connectivity Solutions Midwest Microwave	12.5dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	RoHS Non-compliant	Active	870 Pcs
AT-113V	Hirose Electric Co Ltd	13dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	RoHS Compliant	Last Time Buy	1042 Pcs
M3933/14-20N	Cinch Connectivity Solutions Midwest Microwave	13dB	0 Hz ~ 12.4 GHz	Not Specified	50 Ohms	SMA In-Line Module	RoHS Non-compliant	Active	928 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical and Mechanical Performance): M3933/16-30N and M3933/16-30S are the primary substitutes, offering identical attenuation (12dB), frequency range (0 Hz ~ 18 GHz), power rating (2W), and package configuration. Both parts are in Active product status with established supply availability. Selection between these two variants depends on packaging preference (Bag). Note that these parts are RoHS non-compliant, which may impact applications subject to RoHS regulatory requirements.

For Frequency-Constrained Applications (0 Hz ~ 12.4 GHz Maximum): M3933/14-21N and M3933/14-21S provide 12dB attenuation with reduced frequency coverage. These parts are suitable only for applications operating within the 0 Hz to 12.4 GHz band. Both are Active status with adequate inventory. Power rating is not specified for these variants.

For RoHS-Compliant Designs: AT-113V (Hirose Electric Co Ltd) maintains RoHS compliance and full frequency/power specifications but provides 13dB attenuation instead of 12dB. This part is suitable only when a 1dB increase in attenuation is acceptable within the circuit design.

For Attenuation Tolerance Applications: M3933/16-31N offers full frequency and power specifications (0 Hz ~ 18 GHz, 2W) with 12.5dB attenuation. This variant is applicable only when ±0.5dB attenuation tolerance is acceptable.

Frequently Asked Questions (FAQ)

Q: Can M3933/14-21N or M3933/14-21S be used as direct replacements for AT-112V? A: These parts match the 12dB attenuation and 50 ohm impedance requirements but are limited to 0 Hz ~ 12.4 GHz frequency coverage. They are suitable only for applications operating within this frequency band. The AT-112V operates to 18 GHz, so these substitutes are not appropriate for full-range applications.

Q: What is the difference between M3933/16-30N and M3933/16-30S? A: Both parts are electrically and mechanically identical with 12dB attenuation, 0 Hz ~ 18 GHz frequency range, 2W power rating, and 50 ohm impedance. The difference is packaging: M3933/16-30N is supplied in Bag packaging, while M3933/16-30S is also supplied in Bag packaging. Inventory levels differ (698 Pcs vs. 1015 Pcs).

Q: Why is AT-113V listed as a substitute if it has 13dB attenuation instead of 12dB? A: AT-113V is provided as a reference option for applications where 1dB additional attenuation is acceptable. It maintains RoHS compliance and identical frequency/power specifications. This part is not a direct replacement but an alternative for designs with attenuation tolerance.

Q: Are the Cinch M3933 series parts RoHS compliant? A: No. All Cinch Connectivity Solutions Midwest Microwave M3933 series parts listed are RoHS non-compliant. If RoHS compliance is required, AT-112V or AT-113V (both Hirose Electric Co Ltd) are the compliant options.

Q: What is the significance of the Last Time Buy status for AT-112V? A: Last Time Buy indicates this part is approaching end-of-life. Current inventory (920 Pcs) represents the final production run. For long-term supply assurance, transition to an Active status substitute such as M3933/16-30N or M3933/16-30S is recommended.

Q: Can M3933/16-31N (12.5dB) be used instead of AT-112V (12dB)? A: M3933/16-31N is suitable only for applications where 0.5dB additional attenuation is acceptable. It provides identical frequency range (0 Hz ~ 18 GHz) and power rating (2W), but the attenuation difference may affect circuit performance depending on design margins.

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