RF Attenuator AT-203(40) Equivalent & Substitute Parts

Part Overview

The AT-203(40) is a 3dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for in-line attenuation applications across 0 Hz to 18 GHz frequency range with 50 Ohm impedance and 1W power handling capability. The part features SMA connectors in a compact in-line module package and is RoHS compliant. This part has reached Last Time Buy status, making identification of equivalent substitute components essential for ongoing procurement and system maintenance.

Key Parameters

Parameter	Value
Attenuation Value	3dB
Frequency Range	0 Hz ~ 18 GHz
Power Rating	1W
Impedance	50 Ohms
Package Type	SMA In-Line Module
RoHS Compliance	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the AT-203(40) are qualified based on matching the following critical parameters: 3dB attenuation value, 50 Ohm impedance, 1W power rating, and SMA in-line module package configuration. Frequency range compatibility is evaluated within the operational requirements of the application. All substitute parts maintain the same electrical performance characteristics within their specified frequency bands and are certified to equivalent or higher RoHS standards.

Parameter Comparison

Parameter	AT-203(40) (Hirose)	CATTEN-03R0 (Crystek)	R411803124 (Radiall)	R413V03000 (Radiall)
Attenuation Value	3dB	3dB	3dB	3dB
Frequency Range	0 Hz ~ 18 GHz	0 Hz ~ 3 GHz	0 Hz ~ 3 GHz	0 Hz ~ 67 GHz
Power Rating	1W	1W	1W	1W
Impedance	50 Ohms	50 Ohms	50 Ohms	50 Ohms
Package Type	SMA In-Line Module	SMA In-Line Module	SMA In-Line Module	SMA In-Line Module
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

CATTEN-03R0 and R411803124 are suitable substitutes for applications operating within 0 Hz to 3 GHz frequency range. Both parts are in active production status with ROHS3 compliance certification, providing long-term availability and regulatory assurance.

R413V03000 extends frequency coverage to 67 GHz, making it applicable for broadband and high-frequency applications. This part is actively manufactured by Radiall USA, Inc. and meets ROHS3 compliance requirements.

For applications requiring the full 0 Hz to 18 GHz operational range of the original AT-203(40), R413V03000 provides the closest frequency coverage among available substitutes while maintaining all other critical electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can CATTEN-03R0 or R411803124 replace AT-203(40) in all applications?

A: These substitutes are electrically equivalent within their specified frequency range of 0 Hz to 3 GHz. Applications operating above 3 GHz require evaluation against actual system frequency requirements. Both parts maintain identical attenuation, power rating, impedance, and package configuration.

Q: What is the frequency coverage difference between substitutes?

A: CATTEN-03R0 and R411803124 operate to 3 GHz maximum. R413V03000 extends to 67 GHz. The original AT-203(40) operates to 18 GHz. Substitute selection depends on the maximum frequency required by the application.

Q: Are all substitutes RoHS compliant?

A: Yes. All substitute parts carry ROHS3 certification, meeting or exceeding the RoHS compliance level of the original AT-203(40).

Q: What packaging differences exist among these parts?

A: AT-203(40) and R413V03000 are supplied in Bulk packaging. CATTEN-03R0 is supplied in Bulk packaging. R411803124 is supplied in Box packaging. All maintain identical SMA in-line module form factor.

Q: Which substitute offers the longest production life?

A: CATTEN-03R0, R411803124, and R413V03000 are all in Active production status, providing ongoing availability. The original AT-203(40) is Last Time Buy, making substitution necessary for future procurement.

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