AT-108V RF Attenuator 8dB 50 Ohm SMA In-Line Module

Part Overview

The AT-108V is an RF attenuator manufactured by Hirose Electric Co Ltd, designed for RF signal attenuation applications across 0 Hz to 18 GHz frequency range with 8dB attenuation value, 50 Ohm impedance, and 2W power handling capability in SMA in-line module form factor. This part is currently in Last Time Buy status, indicating production discontinuation. Equivalent and substitute parts from Cinch Connectivity Solutions Midwest Microwave are available to ensure design continuity and supply chain alternatives.

Key Parameters

Parameter	AT-108V Specification
Manufacturer	Hirose Electric Co Ltd
Attenuation Value	8dB
Frequency Range	0 Hz ~ 18 GHz
Impedance	50 Ohms
Power Rating	2W
Package / Case	SMA In-Line Module
RoHS Status	RoHS Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

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

Primary Matching Criteria:

Attenuation Value: 8dB (exact match required for signal level control)
Impedance: 50 Ohms (mandatory for RF circuit compatibility)
Package / Case: SMA In-Line Module (physical and electrical interface requirement)

Secondary Consideration Parameters:

Frequency Range: Parts with 0 Hz ~ 18 GHz match the full operational bandwidth of AT-108V
Power Rating: 2W rating ensures thermal performance equivalence
RoHS Compliance: Environmental and regulatory compliance status

Substitute parts M3933/16-10S and M3933/16-10S (duplicate entry) provide full parametric equivalence with identical attenuation, frequency range, impedance, and power rating specifications. Parts M3933/14-11N and M3933/14-11S operate within a reduced frequency range (0 Hz ~ 12.4 GHz) and lack specified power rating data. Parts M3933/16-25N and M3933/16-25S feature 8.5dB attenuation, representing a 0.5dB deviation from the 8dB specification. Part M3933/25-08N operates within a limited frequency range (0 Hz ~ 2 GHz).

Parameter Comparison

Part Number	Manufacturer	Attenuation Value	Frequency Range	Impedance	Power (Watts)	Package / Case	RoHS Status	Product Status
AT-108V	Hirose Electric Co Ltd	8dB	0 Hz ~ 18 GHz	50 Ohms	2W	SMA In-Line Module	RoHS Compliant	Last Time Buy
M3933/14-11N	Cinch Connectivity Solutions Midwest Microwave	8dB	0 Hz ~ 12.4 GHz	50 Ohms	Not Specified	SMA In-Line Module	RoHS Non-compliant	Active
M3933/14-11S	Cinch Connectivity Solutions Midwest Microwave	8dB	0 Hz ~ 12.4 GHz	50 Ohms	Not Specified	SMA In-Line Module	RoHS Non-compliant	Active
M3933/16-10N	Cinch Connectivity Solutions Midwest Microwave	8dB	0 Hz ~ 18 GHz	50 Ohms	Not Specified	SMA In-Line Module	RoHS Non-compliant	Active
M3933/16-10S	Cinch Connectivity Solutions Midwest Microwave	8dB	0 Hz ~ 18 GHz	50 Ohms	2W	SMA In-Line Module	RoHS Non-compliant	Active
M3933/16-25N	Cinch Connectivity Solutions Midwest Microwave	8.5dB	0 Hz ~ 18 GHz	50 Ohms	2W	SMA In-Line Module	RoHS Non-compliant	Active
M3933/16-25S	Cinch Connectivity Solutions Midwest Microwave	8.5dB	0 Hz ~ 18 GHz	50 Ohms	2W	SMA In-Line Module	RoHS Non-compliant	Active
M3933/25-08N	Cinch Connectivity Solutions Midwest Microwave	8dB	0 Hz ~ 2 GHz	50 Ohms	2W	SMA In-Line Module	RoHS Non-compliant	Active

Engineering Selection Recommendations

Full Equivalence (Recommended for Direct Replacement): M3933/16-10S provides complete parametric equivalence to AT-108V with matching 8dB attenuation, 0 Hz ~ 18 GHz frequency range, 50 Ohm impedance, and 2W power rating. This part is in Active product status with current inventory availability (1107 Pcs). The primary consideration is RoHS non-compliance status, which may require design review if RoHS compliance is a regulatory requirement for the end application.

Frequency-Limited Equivalence: M3933/14-11N and M3933/14-11S maintain 8dB attenuation and 50 Ohm impedance but operate within a reduced frequency range (0 Hz ~ 12.4 GHz). These parts are suitable only for applications where the operating frequency does not exceed 12.4 GHz. Power rating is not specified for these variants.

Attenuation Deviation: M3933/16-25N and M3933/16-25S feature 8.5dB attenuation instead of 8dB, representing a 0.5dB increase in signal attenuation. These parts match the full frequency range and power rating but introduce a measurable deviation in attenuation performance. Selection requires confirmation that 8.5dB attenuation is acceptable for the circuit design.

Bandwidth-Limited Equivalence: M3933/25-08N operates within 0 Hz ~ 2 GHz frequency range only. This part is suitable exclusively for low-frequency RF applications and is not appropriate for broadband or high-frequency designs.

Frequently Asked Questions (FAQ)

Q: Can M3933/16-10S be used as a direct replacement for AT-108V? A: M3933/16-10S matches all critical electrical parameters: 8dB attenuation, 0 Hz ~ 18 GHz frequency range, 50 Ohm impedance, 2W power rating, and SMA in-line module package. The primary difference is RoHS non-compliance status. Direct substitution is feasible if RoHS compliance is not a design requirement.

Q: What is the difference between M3933/16-10N and M3933/16-10S? A: Both parts share identical attenuation (8dB), frequency range (0 Hz ~ 18 GHz), and impedance (50 Ohms). M3933/16-10S specifies 2W power rating, while M3933/16-10N does not provide power rating specification. M3933/16-10S is the preferred selection when power handling capability is a design criterion.

Q: Are M3933/16-25N and M3933/16-25S suitable replacements? A: These parts provide full frequency range coverage (0 Hz ~ 18 GHz) and 2W power rating but feature 8.5dB attenuation instead of 8dB. Substitution is permissible only if circuit design tolerates the additional 0.5dB attenuation loss.

Q: Why is AT-108V listed as Last Time Buy? A: Last Time Buy status indicates Hirose Electric Co Ltd has discontinued production. Existing inventory (989 Pcs) represents the final available stock. Cinch Connectivity Solutions Midwest Microwave M3933 series parts provide active production alternatives.

Q: Can M3933/14-11N or M3933/14-11S be used in broadband RF applications? A: These parts are limited to 0 Hz ~ 12.4 GHz frequency range. They are not suitable for applications requiring operation above 12.4 GHz. Selection is restricted to narrowband or low-frequency RF designs.

Q: What packaging formats are available for substitute parts? A: All substitute parts are supplied in SMA in-line module form factor, matching the AT-108V package specification. Packaging format (Bulk vs. Bag) differs between manufacturers but does not affect electrical performance or mechanical compatibility.

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