AT-105V RF Attenuator 5dB 50 Ohm SMA Equivalent & Substitute Parts

Part Overview

The AT-105V is a 5dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for in-line SMA applications across 0 Hz to 18 GHz with 2W power handling and 50 Ohm impedance. This component is classified as Last Time Buy, indicating production discontinuation. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 5dB attenuation in the specified frequency and power range.

Key Parameters

Parameter	AT-105V Specification
Manufacturer	Hirose Electric Co Ltd
Attenuation Value	5dB
Frequency Range	0 Hz ~ 18 GHz
Power Rating	2W
Impedance	50 Ohms
Package / Case	SMA In-Line Module
RoHS Status	RoHS Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the AT-105V are classified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Attenuation Value: 5dB (exact match required)
Impedance: 50 Ohms (exact match required)
Package / Case: SMA In-Line Module (exact match required)
Frequency Range: 0 Hz ~ 18 GHz (full range coverage required for direct substitution)
Power Rating: 2W (required for equivalent thermal performance)

Grouping Logic:

Group 1 - Full Electrical & Thermal Equivalents (Direct Substitutes): Parts meeting all primary criteria: 5dB attenuation, 50 Ohm impedance, 2W power, 0-18 GHz frequency range, SMA in-line package.

Group 2 - Frequency-Limited Equivalents: Parts with 5dB attenuation, 50 Ohm impedance, SMA package, but reduced frequency range (0-12.4 GHz) or unspecified power rating. Suitable only for applications not requiring full 18 GHz coverage.

Group 3 - Attenuation Variants: Parts with 5.5dB attenuation instead of 5dB. Acceptable only where attenuation tolerance permits deviation.

Group 4 - Frequency-Restricted Variants: Parts with 5dB attenuation and 2W power but limited to 0-2 GHz. Suitable only for low-frequency applications.

Parameter Comparison

Part Number	Manufacturer	Attenuation	Frequency Range	Power (W)	Impedance	Package	Product Status	RoHS Status
AT-105V	Hirose Electric Co Ltd	5dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	Last Time Buy	RoHS Compliant
M3933/16-08S	Cinch Connectivity Solutions Midwest Microwave	5dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	Active	RoHS Non-compliant
M3933/16-08N	Cinch Connectivity Solutions Midwest Microwave	5dB	0 Hz ~ 18 GHz	Not Specified	Not Specified	SMA In-Line Module	Active	RoHS Non-compliant
M3933/14-09N	Cinch Connectivity Solutions Midwest Microwave	5dB	0 Hz ~ 12.4 GHz	Not Specified	50 Ohms	SMA In-Line Module	Active	RoHS Non-compliant
M3933/14-09S	Cinch Connectivity Solutions Midwest Microwave	5dB	0 Hz ~ 12.4 GHz	Not Specified	50 Ohms	SMA In-Line Module	Active	RoHS Non-compliant
M3933/16-22N	Cinch Connectivity Solutions Midwest Microwave	5.5dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	Active	RoHS Non-compliant
M3933/16-22S	Cinch Connectivity Solutions Midwest Microwave	5.5dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	Active	RoHS Non-compliant
M3933/25-05N	Cinch Connectivity Solutions Midwest Microwave	5dB	0 Hz ~ 2 GHz	2W	50 Ohms	SMA In-Line Module	Active	RoHS Non-compliant

Engineering Selection Recommendations

For Full Electrical Equivalence (Recommended Primary Substitute): M3933/16-08S is the closest functional equivalent to AT-105V, matching all critical electrical parameters: 5dB attenuation, 0-18 GHz frequency range, 2W power rating, 50 Ohm impedance, and SMA in-line package. Product status is Active with current inventory availability. Note: RoHS compliance differs from the original AT-105V specification.

For Frequency-Limited Applications: M3933/14-09N and M3933/14-09S are suitable substitutes where application frequency does not exceed 12.4 GHz. These parts maintain 5dB attenuation and 50 Ohm impedance with SMA packaging and Active product status.

For Attenuation-Tolerant Applications: M3933/16-22N and M3933/16-22S provide 5.5dB attenuation across the full 0-18 GHz range with 2W power and 50 Ohm impedance. These are acceptable only where circuit design permits 0.5dB attenuation deviation.

For Low-Frequency Applications Only: M3933/25-05N is restricted to 0-2 GHz operation and should be used only in applications not requiring higher frequency coverage.

Compliance Consideration: All Cinch Connectivity Solutions Midwest Microwave substitutes listed are RoHS non-compliant, whereas the AT-105V is RoHS compliant. Design teams must evaluate regulatory and procurement requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can M3933/16-08S directly replace AT-105V in all applications? A: M3933/16-08S matches all electrical parameters (5dB, 0-18 GHz, 2W, 50 Ohms, SMA package) and is the closest functional equivalent. However, RoHS compliance status differs. Verify compliance requirements for your application before substitution.

Q: What is the difference between M3933/16-08N and M3933/16-08S? A: Both parts share the same base specification (M3933/16) with 5dB attenuation and 0-18 GHz frequency range. The primary difference is packaging designation (N vs. S suffix). Power and impedance specifications are not provided for M3933/16-08N, whereas M3933/16-08S explicitly specifies 2W and 50 Ohms.

Q: Can I use M3933/14-09N as a substitute if my circuit operates below 12.4 GHz? A: Yes, M3933/14-09N is suitable for applications with maximum frequency below 12.4 GHz. It maintains 5dB attenuation and 50 Ohm impedance with SMA in-line packaging. Verify that your application does not require the full 18 GHz coverage of the original AT-105V.

Q: Why are the M3933/16-22 parts listed if they have 5.5dB attenuation instead of 5dB? A: M3933/16-22N and M3933/16-22S are included as alternatives for designs where 0.5dB attenuation deviation is acceptable. They provide full 0-18 GHz coverage with 2W power and 50 Ohm impedance. Use only if circuit design permits this attenuation tolerance.

Q: Is M3933/25-05N a viable substitute for the AT-105V? A: M3933/25-05N is not recommended as a general substitute due to its frequency limitation (0-2 GHz maximum). It is suitable only for low-frequency applications that do not require coverage above 2 GHz.

Q: What does "Last Time Buy" status mean for the AT-105V? A: Last Time Buy indicates that Hirose Electric Co Ltd has discontinued production of the AT-105V. Existing inventory may be available, but no future production is planned. Substitution with an active product is necessary for long-term supply chain continuity.

Q: Are all substitute parts available in the same packaging format? A: All listed substitute parts use SMA in-line module packaging, matching the AT-105V package type. Verify specific packaging details (Bulk vs. Bag) with your supplier if packaging format is a procurement requirement.

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