AT-2303(40) RF Attenuator 3dB 50 Ohm SMA Equivalent & Substitute Parts

Part Overview

The AT-2303(40) is a 3dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for in-line attenuation applications across 0 Hz to 2.5 GHz frequency range with 1W power handling capability and 50 Ohm impedance. This part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing system support and new design implementations. Substitute parts must maintain identical attenuation characteristics, impedance specifications, and connector interface while meeting or exceeding the frequency range and power rating requirements.

Substiute Parts

AT-2303(40)

Hirose Electric Co LtdIn Stock: 902AT-2303(40) Datasheet

Current PartRFQ

CATTEN-03R0

Crystek CorporationIn Stock: 775CATTEN-03R0 Datasheet

Parametric EquivalentRFQ

R411803124

Radiall USA, Inc.In Stock: 1165R411803124 Datasheet

Parametric EquivalentRFQ

R413V03000

Radiall USA, Inc.In Stock: 1143R413V03000 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AT-2303(40) are qualified based on the following mandatory parameters:

• Attenuation Value: 3dB (exact match required)
• Impedance: 50 Ohms (exact match required)
• Package / Case: SMA In-Line Module (exact match required)
• Power Rating: 1W minimum (equal or greater acceptable)
• Frequency Range: Must encompass or exceed 0 Hz ~ 2.5 GHz

Three active substitute parts meet these criteria: CATTEN-03R0 (Crystek Corporation), R411803124 (Radiall USA, Inc.), and R413V03000 (Radiall USA, Inc.). All three maintain the core electrical specifications while offering extended frequency coverage or improved compliance status compared to the obsolete original part.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are active components with current manufacturing status, eliminating obsolescence risk associated with the AT-2303(40). Selection between substitutes should be based on regulatory compliance requirements and frequency range needs for the specific application.

CATTEN-03R0 offers REACH Unaffected status with extended frequency coverage to 3 GHz, suitable for applications requiring simplified supply chain compliance. R411803124 and R413V03000 both carry REACH Affected designation but provide extended frequency ranges (3 GHz and 67 GHz respectively), appropriate for applications requiring broader frequency support or future-proofing beyond the original 2.5 GHz specification. All three parts maintain identical attenuation, power rating, impedance, and SMA connector interface specifications.

Frequently Asked Questions (FAQ)

Q: Can CATTEN-03R0, R411803124, or R413V03000 be used as direct replacements for AT-2303(40)?

A: Yes. All three parts maintain the mandatory specifications: 3dB attenuation, 50 Ohm impedance, 1W power rating, and SMA In-Line Module package. Each part's frequency range encompasses or exceeds the original 2.5 GHz specification, ensuring functional compatibility in existing circuit designs.

Q: What is the primary difference between the three substitute options?

A: The substitutes differ in frequency range coverage and regulatory compliance status. CATTEN-03R0 extends to 3 GHz with REACH Unaffected status. R411803124 extends to 3 GHz with REACH Affected status. R413V03000 extends to 67 GHz with REACH Affected status. All maintain identical core electrical parameters for the 0 Hz to 2.5 GHz operating band.

Q: Are there packaging differences between the main part and substitutes?

A: The main part AT-2303(40) is specified with standard packaging. CATTEN-03R0 is supplied in Bulk packaging, while R411803124 is supplied in Box packaging, and R413V03000 is supplied in Bulk packaging. These packaging variations do not affect electrical performance or mechanical compatibility.

Q: Which substitute part offers the broadest frequency coverage?

A: R413V03000 provides the widest frequency range specification at 0 Hz to 67 GHz, offering maximum future application flexibility while maintaining all core electrical specifications required for AT-2303(40) replacement.

Q: Do all substitute parts meet current RoHS requirements?

A: Yes. All three substitute parts are ROHS3 Compliant, exceeding the RoHS Compliant status of the obsolete AT-2303(40) and meeting current regulatory standards.