ATR4251C-PFPY RF Amplifier IC Equivalent & Substitute Parts

Part Overview

The ATR4251C-PFPY is an RF amplifier integrated circuit designed for AM and FM applications across frequency ranges of 150kHz to 30MHz and 70MHz to 110MHz. This component is packaged in a 24-QFN (4x4) surface mount configuration with an exposed pad. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

ATR4251C-PFPY

Microchip TechnologyIn Stock: 1149ATR4251C-PFPY Datasheet

Current PartRFQ

ATR4251C-PFQW

Microchip TechnologyIn Stock: 5920ATR4251C-PFQW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ATR4251C-PFPY is determined by the following critical parameters:

• Identical frequency range coverage (150kHz ~ 30MHz, 70MHz ~ 110MHz)
• Matching RF type classification (AM, FM)
• Compatible supply voltage range (8V ~ 11V)
• Identical package and case specification (24-VFQFN Exposed Pad)
• Surface mount mounting type
• Equivalent or superior noise figure performance (2.8dB or lower)

The ATR4251C-PFQW meets all substitution criteria as an active product variant within the same ATR4251 base product family, manufactured by Microchip Technology.

Parameter Comparison

Engineering Selection Recommendations

The ATR4251C-PFQW is the manufacturer-recommended substitute for the obsolete ATR4251C-PFPY. Both components share identical frequency coverage, RF type classification, supply voltage specifications, and package configuration. The substitute part is currently in active production status, ensuring availability for new designs and production requirements.

The ATR4251C-PFQW demonstrates improved power efficiency with reduced supply current (14mA versus 17mA) while maintaining equivalent noise figure performance (2.8dB). The gain specification differs by 1dB (5dB versus 6dB), which must be evaluated within the context of specific circuit design requirements.

Both parts maintain full compliance with ROHS3 and REACH regulatory requirements, with identical export classification (EAR99). The substitute part carries a higher moisture sensitivity level (MSL 3 versus MSL 2), requiring appropriate handling and storage protocols during manufacturing and assembly operations.

Frequently Asked Questions (FAQ)

Q: Can the ATR4251C-PFQW be used as a direct replacement for the ATR4251C-PFPY?

A: The ATR4251C-PFQW is the manufacturer-recommended substitute and shares identical package, frequency range, RF type, and supply voltage specifications. The 1dB gain difference and reduced supply current must be evaluated within your specific circuit design parameters.

Q: What is the primary difference between these two parts?

A: The main differences are product status (obsolete versus active), gain specification (6dB versus 5dB), supply current (17mA versus 14mA), and moisture sensitivity level (MSL 2 versus MSL 3). Frequency coverage, noise figure, and package configuration remain identical.

Q: Are there any compliance or regulatory differences?

A: Both parts maintain identical RoHS3, REACH, and ECCN classifications. No regulatory barriers exist for substitution.

Q: What handling considerations apply to the substitute part?

A: The ATR4251C-PFQW carries MSL 3 (168 Hours) moisture sensitivity, compared to MSL 2 (1 Year) for the original part. This requires stricter moisture control during storage, handling, and assembly operations.

Q: Is the gain reduction from 6dB to 5dB significant for my application?

A: Gain impact depends on your circuit design and performance requirements. Evaluate the 1dB reduction within the context of your overall system gain budget and signal path specifications.