AT-105(40) RF Attenuator 5dB 50 Ohm SMA Equivalent & Substitute Parts

Part Overview

The AT-105(40) is a 5dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for in-line attenuation applications across 0 Hz to 18 GHz frequency range with 1W power handling capability and 50 Ohm impedance. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this specific attenuation profile and connector type.

Substiute Parts

AT-105(40)

Hirose Electric Co LtdIn Stock: 894AT-105(40) Datasheet

Current PartRFQ

CATTEN-05R0

Crystek CorporationIn Stock: 1151CATTEN-05R0 Datasheet

Parametric EquivalentRFQ

R411805124

Radiall USA, Inc.In Stock: 1210R411805124 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AT-105(40) are qualified based on matching the following critical parameters: 5dB attenuation value, 1W power rating, 50 Ohm impedance, and SMA in-line module package configuration. Frequency range variations are acceptable provided the substitute covers the minimum operational bandwidth required by the application. All identified substitutes maintain electrical compatibility within these constraints.

Parameter Comparison

Engineering Selection Recommendations

Both CATTEN-05R0 and R411805124 are active production parts with current availability and ROHS3 compliance certification, providing supply chain advantages over the AT-105(40) Last Time Buy status. Selection between substitutes depends on application frequency requirements. For applications operating below 3 GHz, CATTEN-05R0 provides full functional equivalence. For applications requiring operation up to 4 GHz, R411805124 is appropriate. Applications requiring the full 18 GHz bandwidth of the original AT-105(40) should source remaining inventory or evaluate alternative attenuator designs with extended frequency coverage.

Frequently Asked Questions (FAQ)

Q: Can CATTEN-05R0 or R411805124 be used as direct drop-in replacements for AT-105(40)?

A: Both parts share identical attenuation (5dB), power rating (1W), impedance (50 Ohms), and SMA in-line module package. Direct mechanical and electrical substitution is valid within the frequency range limitations of each substitute part.

Q: What is the frequency range limitation impact?

A: CATTEN-05R0 operates to 3 GHz and R411805124 to 4 GHz, compared to AT-105(40) at 18 GHz. Substitution is appropriate only for applications where the signal bandwidth does not exceed the substitute part's frequency specification.

Q: Are there compliance differences between the parts?

A: AT-105(40) is RoHS Compliant. Both substitutes are ROHS3 Compliant, representing a more recent regulatory standard. Both meet ECCN EAR99 classification. CATTEN-05R0 carries REACH Unaffected status.

Q: What inventory considerations apply?

A: AT-105(40) has 883 pieces in stock with Last Time Buy status. CATTEN-05R0 has 1084 pieces and R411805124 has 1165 pieces available as active production items, providing longer-term supply assurance.

Q: Are moisture sensitivity levels a consideration?

A: AT-105(40) has MSL 1 (Unlimited). Both substitutes list MSL as Not Applicable, indicating no moisture sensitivity constraints for either alternative.