RF Attenuator AT-103(40) Equivalent & Substitute Parts

Part Overview

The AT-103(40) is a 3dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for inline attenuation in 50-ohm RF systems. This part operates across a frequency range of 0 Hz to 18 GHz with 1W power handling capability and SMA connectors. The AT-103(40) is designated as Last Time Buy, indicating discontinued production. Identifying equivalent substitute parts is necessary to maintain system compatibility and ensure continued availability for new designs and field replacements.

Substiute Parts

AT-103(40)

Hirose Electric Co LtdIn Stock: 763AT-103(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

Substitution eligibility for the AT-103(40) is determined by matching the following critical parameters: attenuation value (3dB), impedance (50 ohms), power rating (1W), and connector type (SMA In-Line Module). The frequency range represents the operational bandwidth; substitute parts must support the application's required frequency band within their specified limits.

Three substitute parts meet the core electrical and mechanical requirements:

• CATTEN-03R0 (Crystek Corporation): Matches attenuation, impedance, power, and package. Frequency range limited to 0 Hz ~ 3 GHz.
• R411803124 (Radiall USA, Inc.): Matches attenuation, impedance, power, and package. Frequency range limited to 0 Hz ~ 3 GHz.
• R413V03000 (Radiall USA, Inc.): Matches attenuation, impedance, power, and package. Frequency range extended to 0 Hz ~ 67 GHz.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are in Active product status, ensuring long-term availability and supply chain stability compared to the Last Time Buy AT-103(40).

For applications operating within 0 Hz to 3 GHz, CATTEN-03R0 and R411803124 provide direct functional equivalence. CATTEN-03R0 is supplied in bulk packaging, while R411803124 is supplied in box packaging.

For applications requiring operation beyond 3 GHz up to 18 GHz, R413V03000 is the appropriate selection, as it supports the full frequency range of the original AT-103(40) and extends capability to 67 GHz. R413V03000 is supplied in bulk packaging.

All substitute parts maintain RoHS3 compliance, meeting current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can CATTEN-03R0 or R411803124 replace AT-103(40) in all applications?

A: These parts are suitable only for applications operating within 0 Hz to 3 GHz. If your system requires operation above 3 GHz, these substitutes are not appropriate. R413V03000 supports the full 18 GHz range of the original part.

Q: What is the difference between R411803124 and CATTEN-03R0?

A: Both parts share identical electrical specifications (3dB attenuation, 1W power, 50 ohms, 0-3 GHz). The primary difference is packaging: R411803124 is supplied in box packaging, while CATTEN-03R0 is supplied in bulk packaging.

Q: Why does R413V03000 have a higher frequency range than the original AT-103(40)?

A: R413V03000 is specified to operate up to 67 GHz, exceeding the 18 GHz specification of AT-103(40). This extended capability does not affect substitution suitability; the part remains fully compatible with applications requiring operation up to 18 GHz.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts are ROHS3 compliant, meeting current environmental regulations. The original AT-103(40) is RoHS compliant.

Q: What is the inventory status of these substitute parts?

A: CATTEN-03R0: 691 pcs in stock. R411803124: 1155 pcs in stock. R413V03000: 1108 pcs in stock. All parts are available as new original stock.