AT-502 RF Attenuator 2dB 50 Ohm BNC Equivalent & Substitute Parts

Part Overview

The AT-502 is a 2dB 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 part carries Last Time Buy status, indicating discontinued production. Equivalent and substitute parts are necessary to maintain system compatibility and ensure continued availability for new designs and field replacements.

Substiute Parts

AT-502

Hirose Electric Co LtdIn Stock: 950AT-502 Datasheet

Current PartRFQ

ATT-0313-02-BNC-10

Cinch Connectivity Solutions Midwest MicrowaveIn Stock: 952ATT-0313-02-BNC-10 Datasheet

Parametric EquivalentRFQ

PE7437-2

PasternackIn Stock: 861PE7437-2 Datasheet

Parametric EquivalentRFQ

PE7438-2

PasternackIn Stock: 906PE7438-2 Datasheet

Parametric EquivalentRFQ

R412402000

Radiall USA, Inc.In Stock: 736R412402000 Datasheet

Parametric EquivalentRFQ

R414402000

Radiall USA, Inc.In Stock: 1025R414402000 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of RF attenuators is determined by matching the following critical parameters: attenuation value (2dB), impedance (50 Ohms), power rating (2W), package type (BNC In-Line Module), and frequency range capability. Parts are grouped into two categories based on frequency range compatibility with the AT-502 specification of 0 Hz ~ 4 GHz.

Full-Range Equivalents (0 Hz ~ 4 GHz or greater): Parts meeting or exceeding the AT-502 frequency specification.

Limited-Range Substitutes (0 Hz ~ 2 GHz): Parts with reduced frequency range below the AT-502 specification.

Parameter Comparison

Engineering Selection Recommendations

Primary Equivalents: ATT-0313-02-BNC-10 and PE7437-2 provide direct parametric equivalence to the AT-502 across all critical specifications: 2dB attenuation, 0 Hz ~ 4 GHz frequency range, 50 Ohm impedance, 2W power rating, and BNC In-Line Module package. Both parts carry Active product status and RoHS compliance certification.

Extended Frequency Range: R414402000 (Radiall USA, Inc.) exceeds the AT-502 frequency specification with 0 Hz ~ 8 GHz capability while maintaining all other critical parameters. This part is suitable for applications requiring extended frequency coverage.

Limited Frequency Range: R412402000 (Radiall USA, Inc.) operates within 0 Hz ~ 2 GHz, below the AT-502 specification of 0 Hz ~ 4 GHz. This part is suitable only for applications with frequency requirements not exceeding 2 GHz.

Impedance Mismatch: PE7438-2 (Pasternack) specifies 75 Ohm impedance, differing from the AT-502 50 Ohm specification. This part is not suitable for direct substitution in 50 Ohm systems.

Frequently Asked Questions (FAQ)

Q: Can PE7438-2 be used as a substitute for AT-502? A: No. PE7438-2 is specified for 75 Ohm impedance systems, while AT-502 operates at 50 Ohms. Impedance mismatch will result in signal reflections and system performance degradation.

Q: Is R412402000 a suitable replacement for AT-502? A: R412402000 is suitable only for applications operating at frequencies not exceeding 2 GHz. The AT-502 specification extends to 4 GHz. For full frequency range coverage, use ATT-0313-02-BNC-10, PE7437-2, or R414402000.

Q: What is the difference between ATT-0313-02-BNC-10 and PE7437-2? A: Both parts are parametric equivalents with identical electrical and mechanical specifications. Selection between them depends on supplier availability, lead time, and procurement requirements.

Q: Does R414402000 provide better performance than AT-502? A: R414402000 extends frequency coverage to 8 GHz compared to AT-502's 4 GHz specification. For applications operating within 0 Hz ~ 4 GHz, both parts deliver equivalent performance. Extended frequency capability is beneficial only for systems requiring operation above 4 GHz.

Q: Are all substitute parts RoHS compliant? A: ATT-0313-02-BNC-10 and PE7437-2 carry explicit RoHS compliance certification. PE7438-2 is RoHS compliant. R412402000 and R414402000 do not specify RoHS status in available documentation.