SGA-5289Z Equivalent & Substitute Parts

Part Overview

The SGA-5289Z is an RF amplifier IC manufactured by RFMD, designed for cellular, GSM, PCS, and UMTS applications across the 0Hz to 5GHz frequency range in a SOT-89-3 surface mount package. The product is classified as obsolete, making identification of functionally equivalent substitute components essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

SGA-5289Z

RFMDIn Stock: 4004SGA-5289Z Datasheet

Current PartRFQ

SKY65016-70LF

Skyworks Solutions Inc.In Stock: 41308SKY65016-70LF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SGA-5289Z is determined by the following critical parameters:

• Frequency Coverage: The substitute must operate within or encompass the 0Hz to 5GHz range, or at minimum cover the primary test frequency of 1.95GHz for cellular applications.
• Output Power (P1dB): Substitute devices must deliver comparable output power levels (14.4dBm reference) to maintain signal integrity in the application circuit.
• Gain: The amplifier gain of 12.7dB establishes the signal amplification requirement; substitutes should provide equivalent or superior gain performance.
• Noise Figure: At 3.8dB, this parameter defines the noise performance threshold; substitutes must not significantly degrade receiver sensitivity.
• Supply Voltage Compatibility: The 3.1V to 3.9V supply range must be compatible with the substitute device's voltage requirements.
• Package Compatibility: Surface mount TO-243AA (SOT-89-3) packaging is required for direct PCB replacement without redesign.

The SKY65016-70LF from Skyworks Solutions Inc. is identified as a substitute based on comparable electrical performance within the specified parameter ranges and compatible surface mount packaging.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility: The SKY65016-70LF is a viable substitute for the SGA-5289Z in applications where the following conditions are met:

1. Frequency Requirement: The application operates primarily within the 100MHz to 3GHz range. If operation above 3GHz is required, the SKY65016-70LF is not suitable.

2. Gain Adjustment: The higher gain of SKY65016-70LF (20dB vs 12.7dB) requires circuit-level compensation to prevent signal saturation or distortion. Attenuator networks or feedback adjustment may be necessary.

3. Current Budget: The increased supply current (120mA vs 54-66mA) must be accommodated by the power supply design. Thermal management and power dissipation must be re-evaluated.

4. Pin Configuration: The SOT-89-4 package has four pins compared to the SOT-89-3 three-pin configuration of the SGA-5289Z. PCB layout modification is required; direct socket replacement is not possible without redesign.

5. Compliance: Both components are obsolete. The SKY65016-70LF offers superior moisture resistance (MSL 1 vs MSL 2) and RoHS3 compliance, providing advantages for long-term storage and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the SKY65016-70LF be directly soldered into the same PCB footprint as the SGA-5289Z?

A: No. The SGA-5289Z uses SOT-89-3 (3-pin) packaging, while the SKY65016-70LF uses SOT-89-4 (4-pin) packaging. Although both are TO-243AA variants, the pin count and layout differ. PCB redesign is required.

Q: What is the impact of the higher gain in the SKY65016-70LF?

A: The SKY65016-70LF provides 20dB gain compared to 12.7dB in the SGA-5289Z. This 7.3dB difference will increase output signal levels. Circuit analysis is required to determine if attenuation, feedback networks, or gain control modifications are necessary to maintain proper signal levels and prevent compression.

Q: Is the SKY65016-70LF suitable for 5GHz applications?

A: No. The SKY65016-70LF operates up to 3GHz. Applications requiring amplification above 3GHz cannot use this substitute. Alternative components with extended frequency coverage must be evaluated.

Q: How does the increased supply current affect system design?

A: The SKY65016-70LF draws 120mA compared to 54-66mA for the SGA-5289Z. Power supply capacity, current limiting, thermal dissipation, and PCB trace sizing must be re-evaluated to accommodate the additional 54mA current draw.

Q: Are there compliance advantages to using the SKY65016-70LF?

A: Yes. The SKY65016-70LF is RoHS3 compliant and has superior moisture sensitivity (MSL 1 with unlimited shelf life vs MSL 2 with 1-year limit). These factors provide regulatory compliance and extended storage capability.

Q: What is the noise figure impact of substitution?

A: The SKY65016-70LF has a noise figure of 4.8dB compared to 3.8dB for the SGA-5289Z. This 1dB increase will slightly reduce receiver sensitivity. For most cellular applications, this degradation is acceptable; however, low-noise applications should be evaluated on a case-by-case basis.