AT-501 RF Attenuator 1dB 50 Ohm BNC Equivalent & Substitute Parts

Part Overview

The AT-501 is a 1dB RF attenuator manufactured by Hirose Electric Co Ltd, designed for in-line attenuation applications across 0 Hz to 4 GHz frequency range with 50 Ohm impedance and 2W power handling capability. The product is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical specifications and mechanical compatibility to ensure direct replacement functionality.

Key Parameters

Parameter	Specification
Attenuation Value	1dB
Frequency Range	0 Hz ~ 4 GHz
Impedance	50 Ohms
Power Rating	2W
Package / Case	BNC In-Line Module
RoHS Status	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the AT-501 is determined by strict parameter matching across five critical dimensions:

Primary Substitution Criteria:

Attenuation Value: Must equal 1dB
Impedance: Must equal 50 Ohms
Power Rating: Must equal or exceed 2W
Package / Case: Must be BNC In-Line Module
Frequency Range: Must cover or exceed 0 Hz ~ 4 GHz

Compliance Considerations:

RoHS compliance status must be maintained
ECCN and HTSUS classifications must align for regulatory consistency

Parts meeting all five primary criteria are classified as full parametric equivalents. Parts with frequency range limitations below 4 GHz or impedance variations are noted as partial equivalents with specific application constraints.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Attenuation (dB)	Frequency Range (GHz)	Impedance (Ohms)	Power (W)	Package	Product Status	RoHS Status
AT-501	Hirose Electric Co Ltd	1	0 ~ 4	50	2	BNC In-Line Module	Obsolete	RoHS Compliant
ATT-0313-01-BNC-10	Cinch Connectivity Solutions Midwest Microwave	1	0 ~ 4	50	2	BNC In-Line Module	Active	RoHS Compliant
PE7437-1	Pasternack	1	0 ~ 4	50	2	BNC In-Line Module	Active	RoHS Compliant
PE7438-1	Pasternack	1	0 ~ 4	75	2	BNC In-Line Module	Active	RoHS Compliant
R412401000	Radiall USA, Inc.	1	0 ~ 2	50	2	BNC In-Line Module	Active	ROHS3 Compliant
R414401000	Radiall USA, Inc.	1	0 ~ 8	50	2	BNC In-Line Module	Active	RoHS Compliant

Engineering Selection Recommendations

Full Parametric Equivalents (Direct Replacement):

ATT-0313-01-BNC-10 and PE7437-1 meet all primary substitution criteria with identical electrical and mechanical specifications to the AT-501. Both parts are in active production status, ensuring long-term availability. ATT-0313-01-BNC-10 is available in bulk packaging with 919 units in stock. PE7437-1 is available in bulk packaging with 816 units in stock.

Extended Frequency Range Equivalent:

R414401000 provides extended frequency coverage to 8 GHz while maintaining all other AT-501 specifications. This part is suitable for applications requiring the AT-501 functionality within the 0 Hz ~ 4 GHz range, with additional headroom for future frequency expansion. Product status is active with 924 units in stock.

Limited Frequency Range Equivalent:

R412401000 operates within 0 Hz ~ 2 GHz frequency range, which is a subset of the AT-501 specification. This part is suitable only for applications operating exclusively below 2 GHz. Product status is active with 1187 units in stock.

Impedance Variant (Not Recommended for Direct Substitution):

PE7438-1 is a 75 Ohm variant. This part does not meet the 50 Ohm impedance requirement and is not suitable as a direct substitute for the AT-501 in 50 Ohm systems.

Frequently Asked Questions (FAQ)

Q: Can PE7438-1 be used as a substitute for AT-501?

A: No. PE7438-1 has 75 Ohm impedance while AT-501 requires 50 Ohm impedance. Using a 75 Ohm attenuator in a 50 Ohm system will cause impedance mismatch, signal reflections, and measurement errors.

Q: Is R412401000 suitable for all AT-501 applications?

A: R412401000 is suitable only for applications operating within the 0 Hz ~ 2 GHz frequency range. Applications requiring attenuation above 2 GHz must use ATT-0313-01-BNC-10, PE7437-1, or R414401000.

Q: What is the difference between ATT-0313-01-BNC-10 and PE7437-1?

A: Both parts are full parametric equivalents to AT-501 with identical electrical specifications and BNC in-line module packaging. The primary difference is manufacturer: ATT-0313-01-BNC-10 is manufactured by Cinch Connectivity Solutions Midwest Microwave, while PE7437-1 is manufactured by Pasternack. Both are in active production status.

Q: Why is R414401000 listed as an equivalent if it has 8 GHz frequency range instead of 4 GHz?

A: R414401000 exceeds the AT-501 frequency specification, providing extended operational range. For applications requiring only 0 Hz ~ 4 GHz coverage, R414401000 functions identically to AT-501 while offering additional frequency headroom. This makes it a suitable substitute with enhanced capability.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts meet RoHS compliance requirements. AT-501, ATT-0313-01-BNC-10, PE7437-1, PE7438-1, and R414401000 are RoHS Compliant. R412401000 is ROHS3 Compliant, which meets current RoHS standards.

Q: What packaging options are available for substitute parts?

A: All substitute parts are available in bulk packaging, suitable for production and integration environments.

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