AT-503(40) RF Attenuator Equivalent & Substitute Parts

Part Overview

The AT-503(40) is a 3dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for inline attenuation applications across DC to 4 GHz frequency range with 50 Ohm impedance and 2W power handling capability. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and procurement planning. The BNC connector configuration provides standard RF interface compatibility for laboratory and field applications.

Substiute Parts

AT-503(40)

Hirose Electric Co LtdIn Stock: 1095AT-503(40) Datasheet

Current PartRFQ

CATTEN-03R0-BNC

Crystek CorporationIn Stock: 1280CATTEN-03R0-BNC Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT-503(40) is determined by the following critical parameters:

• Attenuation Value: Must be 3dB
• Impedance: Must be 50 Ohms
• Package / Case: Must be BNC In-Line Module
• Power Rating: Must be 2W minimum
• Connector Type: Must be BNC

The CATTEN-03R0-BNC from Crystek Corporation meets these core substitution criteria. While the frequency range differs (0 Hz ~ 1 GHz versus 0 Hz ~ 4 GHz), this represents a subset of the original specification and does not prevent substitution in applications operating within the 1 GHz upper limit.

Parameter Comparison

Engineering Selection Recommendations

The CATTEN-03R0-BNC is suitable as a direct substitute for the AT-503(40) in applications where the operating frequency does not exceed 1 GHz. Both parts maintain identical attenuation, impedance, power handling, and physical package specifications. The Crystek part carries active product status with ROHS3 compliance, providing improved long-term availability and regulatory alignment compared to the obsolete Hirose component. Selection should be based on specific application frequency requirements and procurement lead time considerations.

Frequently Asked Questions (FAQ)

Q: Can the CATTEN-03R0-BNC replace the AT-503(40) in all applications?

A: The CATTEN-03R0-BNC is suitable for applications operating at frequencies up to 1 GHz. If your system requires operation above 1 GHz, the frequency range limitation of the substitute part must be evaluated against actual system requirements.

Q: Are the physical dimensions and connector interfaces identical?

A: Both parts use BNC In-Line Module packaging. Mechanical compatibility is ensured for standard BNC connector installations.

Q: What is the difference in RoHS compliance between these parts?

A: The AT-503(40) meets RoHS Compliant standards, while the CATTEN-03R0-BNC meets the more recent ROHS3 Compliant specification. ROHS3 represents an updated compliance framework and does not indicate incompatibility.

Q: Are there inventory considerations for this substitution?

A: The AT-503(40) is classified as obsolete with limited remaining stock. The CATTEN-03R0-BNC is an active product with current manufacturing availability.

Q: Do both parts handle the same power levels?

A: Yes, both parts are rated for 2W power handling at 50 Ohm impedance.