AT-603(40) RF Attenuator 3dB 50 Ohm TNC Equivalent & Substitute Parts

Part Overview

The AT-603(40) is a 3dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for in-line TNC applications across 0 Hz to 6 GHz frequency range with 2W power handling and 50 Ohm impedance. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs requiring comparable RF attenuation performance.

Key Parameters

Parameter	Value
Attenuation Value	3dB
Frequency Range	0 Hz ~ 6 GHz
Power Rating	2W
Impedance	50 Ohms
Package / Case	TNC In-Line Module
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the AT-603(40) is determined by strict alignment with the following core parameters: 3dB attenuation value, 50 Ohm impedance, 2W power rating, and TNC in-line module form factor. All listed substitute parts maintain these baseline specifications. Frequency range variations among substitutes are permitted, as extended frequency coverage does not compromise compatibility in applications operating within the original 0 Hz to 6 GHz band. Substitute parts are grouped by manufacturer and frequency capability to support selection based on application requirements and product availability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Attenuation	Frequency Range	Power (W)	Impedance	Package	Product Status
AT-603(40)	Hirose Electric Co Ltd	3dB	0 Hz ~ 6 GHz	2W	50 Ohms	TNC In-Line Module	Obsolete
6803.26.A	Huber+Suhner, Inc.	3dB	0 Hz ~ 12.4 GHz	2W	50 Ohms	TNC In-Line Module	Active
ATT-0225-03-TNC-02	Cinch Connectivity Solutions Midwest Microwave	3dB	0 Hz ~ 18 GHz	2W	50 Ohms	TNC In-Line Module	Active
R412503000	Radiall USA, Inc.	3dB	0 Hz ~ 2 GHz	2W	50 Ohms	TNC In-Line Module	Active
R414503000	Radiall USA, Inc.	3dB	0 Hz ~ 12.4 GHz	2W	50 Ohms	TNC In-Line Module	Active
R414503150	Radiall USA, Inc.	3dB	0 Hz ~ 12.4 GHz	2W	50 Ohms	TNC In-Line Module	Active
R414503161	Radiall USA, Inc.	3dB	0 Hz ~ 18 GHz	2W	50 Ohms	TNC In-Line Module	Active

Engineering Selection Recommendations

All substitute parts listed maintain active product status with the exception of the original AT-603(40), which is obsolete. Selection among active substitutes should prioritize parts with compliance certifications where applicable. The ATT-0225-03-TNC-02 carries RoHS Compliant status and MSL 1 rating. The R414503000 carries ROHS3 Compliant status. For applications requiring extended frequency coverage beyond 6 GHz, the 6803.26.A, ATT-0225-03-TNC-02, R414503000, R414503150, and R414503161 all provide frequency ranges of 12.4 GHz or higher. For applications with frequency requirements limited to 2 GHz or below, the R412503000 provides a suitable alternative. All parts share identical attenuation, power rating, impedance, and form factor specifications.

Frequently Asked Questions (FAQ)

Q: Can any of these substitute parts directly replace the AT-603(40)? A: Yes. All listed substitute parts maintain the core specifications of 3dB attenuation, 50 Ohm impedance, 2W power rating, and TNC in-line module form factor. Direct mechanical and electrical compatibility is established for applications operating within the original 0 Hz to 6 GHz frequency band.

Q: What is the significance of frequency range differences among substitutes? A: Frequency range indicates the upper operational limit of the attenuator. Substitutes with extended frequency ranges (12.4 GHz, 18 GHz) remain fully compatible with applications requiring only 6 GHz operation. Selection of higher frequency-rated parts introduces no compatibility issues for lower-frequency applications.

Q: Which substitute offers the widest frequency coverage? A: Both ATT-0225-03-TNC-02 and R414503161 provide 0 Hz to 18 GHz frequency range, the highest among all listed substitutes.

Q: Are there compliance or regulatory differences between substitutes? A: The ATT-0225-03-TNC-02 is RoHS Compliant with MSL 1 rating. The R414503000 is ROHS3 Compliant. All parts carry EAR99 ECCN and 8533.21.0090 HTSUS classification. Selection should align with specific regulatory requirements of the application.

Q: What is the inventory status of substitute parts? A: All substitute parts are listed as new original stock with quantities ranging from 644 to 1013 pieces, indicating active availability across multiple manufacturers and distributors.

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