RF Attenuator AT-204(40) Equivalent & Substitute Parts

Part Overview

The AT-204(40) is a 4dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for inline attenuation in 50-ohm RF systems operating from DC to 18 GHz with 1W power handling capability. The part features SMA connectors in a compact in-line module package and is RoHS compliant. This part is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing system support and new designs requiring similar RF attenuation characteristics.

Substiute Parts

AT-204(40)

Hirose Electric Co LtdIn Stock: 710AT-204(40) Datasheet

Current PartRFQ

AT-104-WP1(40)

Hirose Electric Co LtdIn Stock: 860AT-104-WP1(40) Datasheet

Parametric EquivalentRFQ

CATTEN-04R0

Crystek CorporationIn Stock: 1111CATTEN-04R0 Datasheet

Parametric EquivalentRFQ

R411804124

Radiall USA, Inc.In Stock: 822R411804124 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT-204(40) is determined by matching the following critical parameters: attenuation value (4dB), impedance (50 ohms), power rating (1W), and package type (SMA in-line module). The frequency range represents the operational bandwidth; substitute parts may have equal or greater bandwidth capability. All identified substitutes maintain these core electrical and mechanical specifications, ensuring functional compatibility in RF attenuation applications.

Parameter Comparison

Engineering Selection Recommendations

The AT-104-WP1(40) from Hirose Electric Co Ltd is the primary parametric equivalent, offering identical electrical specifications and frequency range to the obsolete AT-204(40) while maintaining active product status and RoHS compliance. This part is the preferred direct replacement for applications requiring the full 18 GHz bandwidth.

For applications with frequency requirements limited to 6 GHz or below, the R411804124 from Radiall USA, Inc. provides an active substitute with ROHS3 compliance and equivalent attenuation, impedance, and power characteristics.

The CATTEN-04R0 from Crystek Corporation is suitable for applications operating within 3 GHz bandwidth requirements, offering active product status and ROHS3 compliance. This part is available in bulk packaging.

All three substitute parts maintain the critical 4dB attenuation, 50-ohm impedance, 1W power rating, and SMA in-line module package required for functional compatibility with the original AT-204(40) specification.

Frequently Asked Questions (FAQ)

Q: Can the AT-104-WP1(40) directly replace the AT-204(40)?

A: Yes. Both parts share identical attenuation (4dB), frequency range (0 Hz ~ 18 GHz), impedance (50 ohms), power rating (1W), and SMA in-line module package. The AT-104-WP1(40) is active and RoHS compliant, making it the direct equivalent for the obsolete AT-204(40).

Q: What is the difference between the Hirose AT-104-WP1(40) and the Crystek CATTEN-04R0?

A: Both provide 4dB attenuation at 50 ohms with 1W power handling in SMA in-line modules. The primary difference is frequency range: the Hirose part operates to 18 GHz, while the Crystek part is rated to 3 GHz. Select based on your application's maximum operating frequency.

Q: Is the Radiall R411804124 compatible with the original AT-204(40)?

A: The R411804124 matches the core electrical parameters (4dB, 50 ohms, 1W, SMA in-line module) but has a frequency range limited to 6 GHz compared to the AT-204(40)'s 18 GHz capability. It is suitable for applications not requiring operation above 6 GHz.

Q: Are all substitute parts RoHS compliant?

A: Yes. The AT-104-WP1(40) is RoHS compliant. The CATTEN-04R0 and R411804124 are ROHS3 compliant, meeting current regulatory requirements.

Q: What packaging options are available for these substitutes?

A: The AT-104-WP1(40) is available in standard packaging. The CATTEN-04R0 and R411804124 are available in bulk packaging. Confirm packaging requirements with your procurement specifications.