AT-509(40) RF Attenuator 9dB 50 Ohm BNC Equivalent & Substitute Parts

Part Overview

The AT-509(40) is a 9dB 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 operates in BNC connector configuration as an in-line module. The product is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	AT-509(40)
Manufacturer	Hirose Electric Co Ltd
Attenuation Value	9dB
Frequency Range	0 Hz ~ 4 GHz
Impedance	50 Ohms
Power Rating	2W
Package / Case	BNC In-Line Module
RoHS Status	RoHS Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the AT-509(40) is determined by the following critical parameters: attenuation value (9dB), impedance (50 Ohms), power rating (2W), package type (BNC In-Line Module), and frequency range compatibility. Parts are grouped into two categories:

Full Parametric Equivalents (0 Hz ~ 4 GHz): Parts matching all key parameters including the exact 4 GHz frequency ceiling. These provide direct replacement capability without design modification.

Frequency-Extended Equivalents (0 Hz ~ 8 GHz or 0 Hz ~ 2 GHz): Parts with identical attenuation, impedance, power, and package specifications but differing frequency ranges. The 8 GHz variant provides extended frequency coverage; the 2 GHz variant provides reduced frequency range.

Impedance Variant (75 Ohms): PE7438-9 matches all parameters except impedance (75 Ohms instead of 50 Ohms) and is not a direct substitute without circuit redesign.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Attenuation (dB)	Frequency Range	Impedance (Ohms)	Power (W)	Package	RoHS Status	Product Status
AT-509(40)	Hirose Electric Co Ltd	9	0 Hz ~ 4 GHz	50	2	BNC In-Line Module	RoHS Compliant	Last Time Buy
ATT-0313-09-BNC-10	Cinch Connectivity Solutions Midwest Microwave	9	0 Hz ~ 4 GHz	50	2	BNC In-Line Module	RoHS Compliant	Active
PE7437-9	Pasternack	9	0 Hz ~ 4 GHz	50	2	BNC In-Line Module	RoHS Compliant	Active
PE7438-9	Pasternack	9	0 Hz ~ 4 GHz	75	2	BNC In-Line Module	RoHS Compliant	Active
R412409000	Radiall USA, Inc.	9	0 Hz ~ 2 GHz	50	2	BNC In-Line Module	RoHS Compliant	Active
R414409000	Radiall USA, Inc.	9	0 Hz ~ 8 GHz	50	2	BNC In-Line Module	RoHS Compliant	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement):

ATT-0313-09-BNC-10 and PE7437-9 are full parametric equivalents with identical specifications to AT-509(40). Both are Active status products with RoHS compliance and matching frequency range (0 Hz ~ 4 GHz), impedance (50 Ohms), attenuation (9dB), and power rating (2W). Either part provides direct substitution without circuit modification.

Extended Frequency Substitute:

R414409000 (Radiall USA, Inc.) provides identical core specifications with extended frequency range to 8 GHz. This part is suitable for applications requiring operation beyond 4 GHz while maintaining all other electrical parameters. Active product status ensures ongoing availability.

Limited Frequency Substitute:

R412409000 (Radiall USA, Inc.) operates within 0 Hz ~ 2 GHz frequency range. This part is suitable only for applications with maximum operating frequency at or below 2 GHz. Active product status supports procurement continuity.

Non-Recommended Substitute:

PE7438-9 operates at 75 Ohm impedance, differing from the AT-509(40) 50 Ohm specification. This part is not a direct substitute and requires circuit impedance matching redesign.

Frequently Asked Questions (FAQ)

Q: Can ATT-0313-09-BNC-10 directly replace AT-509(40) without any modifications?

A: Yes. ATT-0313-09-BNC-10 matches all electrical and mechanical parameters: 9dB attenuation, 50 Ohm impedance, 2W power rating, 0 Hz ~ 4 GHz frequency range, and BNC in-line module package. No circuit modifications are required.

Q: What is the difference between PE7437-9 and PE7438-9?

A: Both parts are 9dB Pasternack attenuators with identical frequency range (0 Hz ~ 4 GHz), power rating (2W), and BNC in-line module package. The critical difference is impedance: PE7437-9 is 50 Ohms (equivalent to AT-509(40)), while PE7438-9 is 75 Ohms (not equivalent without redesign).

Q: Can R414409000 be used in place of AT-509(40)?

A: R414409000 is suitable for applications operating at or below 4 GHz. It provides identical attenuation (9dB), impedance (50 Ohms), power rating (2W), and package type. The extended frequency range to 8 GHz does not affect performance within the 0 Hz ~ 4 GHz operating window.

Q: Why is R412409000 listed as a substitute if it only operates to 2 GHz?

A: R412409000 is a valid substitute only for applications with maximum operating frequency at or below 2 GHz. For systems requiring full 4 GHz operation, this part is not suitable.

Q: What does "Last Time Buy" status mean for AT-509(40)?

A: Last Time Buy indicates the manufacturer is discontinuing this part. Existing inventory represents the final production run. Transition to an Active status equivalent (ATT-0313-09-BNC-10 or PE7437-9) is recommended for new designs and long-term procurement planning.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry RoHS Compliant certification, matching the AT-509(40) environmental compliance status.

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