ATF-551M4-TR2 Equivalent & Substitute Parts

Part Overview

The ATF-551M4-TR2 is an RF MOSFET pseudomorphic high electron mobility transistor (pHEMT FET) manufactured by Broadcom Limited, designed for RF amplification applications operating at 2GHz. This component features a 2.7V test voltage rating, 17.5dB gain, and 14.6dBm output power in a MiniPak 1412 package. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

ATF-551M4-TR2

Broadcom LimitedIn Stock: 899ATF-551M4-TR2 Datasheet

Current PartRFQ

SKY65050-372LF

Skyworks Solutions Inc.In Stock: 47606SKY65050-372LF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATF-551M4-TR2 is determined by the following critical parameters:

Technology Match: Both the main part and substitute must utilize pHEMT FET technology for equivalent RF performance characteristics.

Frequency Band Compatibility: Operating frequency must support the 2GHz application band. The substitute operates at 2.4GHz, which falls within the same RF spectrum region.

Voltage Specifications: Test voltage and rated voltage must be compatible with circuit design requirements. The ATF-551M4-TR2 operates at 2.7V test / 5V rated, while the substitute operates at 3V test / 6V rated, representing acceptable voltage compatibility for RF amplifier applications.

Gain and Power Output: Gain of 17.5dB and output power of 14.6dBm define the amplification characteristics. The substitute provides 15.5dB gain and 10.5dBm output power, representing comparable RF performance within typical application tolerances.

Noise Figure: The 0.5dB noise figure of the main part is matched by the substitute's 0.4dB noise figure, indicating equivalent or superior low-noise performance.

Package Considerations: The main part uses MiniPak 1412 (0505 metric), while the substitute uses SC-70-4 (SC-82A, SOT-343). Both are surface-mount packages suitable for RF applications, though physical footprint differs.

Compliance and Availability: The substitute is active product status with RoHS3 compliance and significantly higher inventory availability (47,571 pcs vs. 870 pcs).

Parameter Comparison

Engineering Selection Recommendations

The SKY65050-372LF serves as a functional equivalent for the obsolete ATF-551M4-TR2 based on the following engineering criteria:

Product Status Alignment: The ATF-551M4-TR2 is classified as obsolete, creating supply chain risk. The SKY65050-372LF maintains active product status with established manufacturing continuity and significantly higher inventory availability.

Technology Equivalence: Both components utilize pHEMT FET technology, ensuring comparable RF performance characteristics and circuit behavior in amplifier applications.

Compliance Certification: Both parts carry REACH Unaffected and EAR99 ECCN classifications. The substitute additionally provides RoHS3 compliance, meeting current environmental and regulatory requirements.

RF Performance Parameters: Operating frequency, gain, output power, and noise figure fall within acceptable ranges for RF amplifier substitution. The substitute's 2.4GHz frequency and 15.5dB gain support 2GHz band applications with minor circuit tuning considerations.

Voltage Compatibility: The substitute's 3V test voltage and 6V rated voltage are compatible with standard RF amplifier circuit designs that accommodate the ATF-551M4-TR2's 2.7V test and 5V rated specifications.

Package Transition: Physical package change from MiniPak 1412 to SC-70-4 requires PCB layout modification. Both packages are surface-mount configurations suitable for automated assembly.

Frequently Asked Questions (FAQ)

Q: Can the SKY65050-372LF directly replace the ATF-551M4-TR2 without circuit modification?

A: Direct pin-for-pin replacement is not possible due to different package types (MiniPak 1412 vs. SC-70-4). PCB layout redesign is required. However, the electrical characteristics support functional substitution with standard RF amplifier circuit tuning.

Q: What are the key differences in RF performance between these parts?

A: The main part provides 17.5dB gain at 2GHz with 14.6dBm output power. The substitute provides 15.5dB gain at 2.4GHz with 10.5dBm output power. Both operate with comparable noise figures (0.5dB vs. 0.4dB). Circuit impedance matching and bias networks may require adjustment for the substitute.

Q: Are there voltage supply compatibility issues?

A: The substitute requires slightly higher supply voltage (3V test vs. 2.7V test, 6V rated vs. 5V rated). Existing power supply designs must accommodate this increase. Both parts operate within standard RF amplifier voltage ranges.

Q: What is the impact of the frequency difference (2GHz vs. 2.4GHz)?

A: The 2.4GHz operating frequency of the substitute is higher than the main part's 2GHz specification. This requires circuit tuning adjustments, particularly in matching networks and bias circuits, to optimize performance at the intended 2GHz application frequency.

Q: How do the package differences affect implementation?

A: The ATF-551M4-TR2 uses MiniPak 1412 (0505 metric), while the SKY65050-372LF uses SC-70-4 (SOT-343). The substitute package is smaller and requires different PCB footprint design. Both are surface-mount packages compatible with standard assembly processes.

Q: Is the substitute suitable for new designs?

A: The SKY65050-372LF is active product status with RoHS3 compliance and established supply chain availability, making it suitable for new designs. The ATF-551M4-TR2 is obsolete and should not be specified for new applications.

Q: What are the current rating differences?

A: The main part has 100mA current rating with 10mA test current. The substitute has 55mA current rating with 20mA test current. Circuit bias design must account for these differences in quiescent current requirements.