AT-505(40) RF Attenuator 5dB 50 Ohm BNC Equivalent & Substitute Parts

Part Overview

The AT-505(40) is a 5dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for inline attenuation applications across 0 Hz to 4 GHz frequency range with 50 Ohm impedance and 2W power handling capability. This part is currently in Last Time Buy status, making identification of equivalent and substitute components essential for ongoing system design and procurement planning. The BNC connector configuration provides standard RF connectivity for test, measurement, and signal conditioning applications.

Substiute Parts

AT-505(40)

Hirose Electric Co LtdIn Stock: 944AT-505(40) Datasheet

Current PartRFQ

ATT-0313-05-BNC-10

Cinch Connectivity Solutions Midwest MicrowaveIn Stock: 1169ATT-0313-05-BNC-10 Datasheet

Parametric EquivalentRFQ

PE7437-5

PasternackIn Stock: 1094PE7437-5 Datasheet

Parametric EquivalentRFQ

PE7438-5

PasternackIn Stock: 995PE7438-5 Datasheet

Parametric EquivalentRFQ

R412405000

Radiall USA, Inc.In Stock: 1031R412405000 Datasheet

Parametric EquivalentRFQ

R414405000

Radiall USA, Inc.In Stock: 1037R414405000 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AT-505(40) are grouped based on strict parameter matching across attenuation value, impedance, power rating, and package type. The primary substitution criterion is the combination of 5dB attenuation, 50 Ohm impedance, 2W power handling, and BNC in-line module packaging. Frequency range variations are noted where they occur, as they represent the operational bandwidth of each component.

Key Parameters Determining Substitution:

• Attenuation Value: 5dB (exact match required)
• Impedance: 50 Ohms (exact match required)
• Power Rating: 2W (exact match required)
• Package Type: BNC In-Line Module (exact match required)
• Frequency Range: 0 Hz ~ 4 GHz (baseline specification)

Parameter Comparison

Engineering Selection Recommendations

Full Parameter Match (Recommended Primary Substitutes):

ATT-0313-05-BNC-10 and PE7437-5 provide complete parameter alignment with the AT-505(40), matching all critical specifications including 5dB attenuation, 50 Ohm impedance, 2W power rating, 0 Hz to 4 GHz frequency range, and BNC in-line module packaging. Both components maintain Active product status with RoHS compliance, providing long-term availability and regulatory alignment.

Frequency Range Considerations:

R412405000 operates within a reduced frequency range of 0 Hz to 2 GHz, suitable only for applications where the system bandwidth does not exceed 2 GHz. R414405000 extends frequency coverage to 8 GHz, providing broader bandwidth capability while maintaining 50 Ohm impedance and 2W power handling.

Impedance Deviation:

PE7438-5 specifies 75 Ohm impedance rather than 50 Ohms. This component is not suitable as a direct substitute for 50 Ohm system applications due to impedance mismatch, which will result in signal reflections and performance degradation.

Compliance and Availability:

All recommended substitutes maintain RoHS compliance status. ATT-0313-05-BNC-10 and PE7437-5 are preferred for new designs due to Active product status and full parameter equivalence with the AT-505(40).

Frequently Asked Questions (FAQ)

Q: Can PE7438-5 be used as a substitute for AT-505(40)?

A: No. PE7438-5 specifies 75 Ohm impedance while AT-505(40) requires 50 Ohm impedance. Using a 75 Ohm attenuator in a 50 Ohm system will cause impedance mismatch and signal reflections.

Q: What is the difference between R412405000 and R414405000?

A: Both are 5dB, 50 Ohm, 2W BNC attenuators from Radiall USA, Inc. R412405000 operates from 0 Hz to 2 GHz, while R414405000 operates from 0 Hz to 8 GHz. Selection depends on the required system bandwidth.

Q: Are ATT-0313-05-BNC-10 and PE7437-5 fully equivalent to AT-505(40)?

A: Yes. Both components match all specified parameters: 5dB attenuation, 50 Ohm impedance, 2W power rating, 0 Hz to 4 GHz frequency range, BNC in-line module packaging, and RoHS compliance.

Q: Why is AT-505(40) listed as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing this part. Equivalent substitutes with Active status should be evaluated for new designs and future procurement.

Q: Does impedance matching affect attenuator selection?

A: Yes. The attenuator impedance must match the system characteristic impedance. For 50 Ohm systems, only 50 Ohm attenuators are suitable. Impedance mismatch introduces reflections and measurement errors.

Q: Can I use R412405000 if my system operates below 2 GHz?

A: Yes. R412405000 is suitable for applications operating within its 0 Hz to 2 GHz frequency range. If your system requires operation above 2 GHz, use ATT-0313-05-BNC-10, PE7437-5, or R414405000.