Part A
GALI-84+
Minicircuitos
- Lifecycle
- Active
- Stock
- 4560 PCS
- Package
- SOT-89-4
- Series
- Amplificadores RF
Replacement verdict
Compatible functional replacement candidate
The GALI-84+ is a viable functional replacement candidate for the GALI-3+ in many RF and microwave amplifier designs, with strong alignment in gain, frequency range, and package footprint. However, designers must validate supply current, output power at compression, and thermal behavior under their specific operating conditions before committing to a drop-in substitution.
Gain
High match
Frequency Range
High match
Supply Current
Validation required
Output Power at 1 dB Compression
Validation required
Parts at a glance
Part B
GALI-3+
Minicircuitos
- Lifecycle
- Active
- Stock
- 1439 PCS
- Package
- SOT-89-4
- Series
- Amplificadores RF
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | GALI-3+ | GALI-84+ | Why it matters |
|---|---|---|---|
| Frequency Range | DC to 3000 MHz | DC to 6000 MHz | Determines the range of signal frequencies the amplifier can effectively amplify, directly affecting its suitability for a given application. |
| Gain at 1 GHz | 19.1 dB | 16.5 dB | Higher gain means the amplifier provides more signal amplification, which is critical for weak signal environments. |
| Noise Figure at 1 GHz | 4.2 dB | 3.5 dB | Lower noise figure indicates less added noise, improving the signal-to-noise ratio, which is vital for receiver sensitivity. |
| Output Power at 1 dB Compression (P1dB) at 1 GHz | 12.5 dBm | 13.5 dBm | Indicates the maximum output power before distortion, affecting the amplifier's dynamic range and ability to handle strong signals. |
| Output Third-Order Intercept Point (OIP3) at 1 GHz | 25.5 dBm | 27.5 dBm | Higher OIP3 means better linearity and lower intermodulation distortion, crucial for maintaining signal fidelity in multi-tone systems. |
| Supply Voltage | 5 V | 5 V | The required DC voltage for operation; must match the system power supply. |
| Supply Current | 35 mA | 50 mA | Affects power consumption and thermal design; higher current may require better heat dissipation. |
| Package Type | SOT-89 | SOT-89 | Physical footprint and mounting style; must be compatible with the PCB layout. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | GALI-84+ | GALI-3+ |
|---|---|---|
| Part Status | Active | Active |
| Frequency | 0Hz ~ 6GHz | 0Hz ~ 3GHz |
| P1d B | 21.9dBm | 12.5dBm |
| Gain | 11.8dB | 15.8dB |
| Noise Figure | 5.3dB | 3.5dB |
| RF Type | CATV, DBS, MMDS, Wireless LAN | Cellular, PCS |
| Voltage - Supply | 5.4V ~ 6.2V | 3V ~ 4.1V |
| Supply Current | 100mA | 35mA |
| Test Frequency | 100MHz | 2GHz |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between GALI-3+ and GALI-84+?
Both are Mini-Circuits monolithic amplifiers in the same package style, but they differ in gain, output power, and frequency range. The GALI-3+ is a wideband amplifier with approximately 20 dB gain and +12.5 dBm output power at 1 dB compression, while the GALI-84+ offers higher gain of approximately 25 dB and higher output power of approximately +18 dBm P1dB. The GALI-84+ also provides a lower noise figure in its optimal band. Designers should consult the respective datasheets for exact limits.
Are GALI-3+ and GALI-84+ pin-compatible?
Yes. Both devices are supplied in the same 4-pin SOT-89 package with identical pin functions: pin 1 is RF input, pin 2 is RF output and DC bias, pin 3 is ground, and pin 4 is ground. This allows a common PCB footprint, but electrical differences must still be evaluated before substitution.
Can GALI-84+ directly replace GALI-3+ in an existing design?
Not without verification. Although the package and pinout are the same, the GALI-84+ has higher gain and higher output power, which can affect stability, bias current, and matching. The bias resistor and supply voltage may need adjustment to maintain the correct operating point. Always validate against the Mini-Circuits datasheets and the target design requirements.
What is the frequency range of GALI-3+ and GALI-84+?
The GALI-3+ is specified for DC to 4 GHz operation. The GALI-84+ is specified for DC to 6 GHz operation. Actual usable bandwidth depends on the application circuit, bias network, and board layout.
How do the gain and output power compare between GALI-3+ and GALI-84+?
The GALI-3+ provides approximately 20 dB gain with about +12.5 dBm output power at 1 dB compression. The GALI-84+ provides approximately 25 dB gain with about +18 dBm output power at 1 dB compression. The GALI-84+ is therefore better suited for applications requiring higher gain and higher output power, while the GALI-3+ may be preferred where lower gain and lower power consumption are acceptable.
What is the noise figure of GALI-3+ and GALI-84+?
The GALI-3+ has a typical noise figure of approximately 4.5 dB at 1 GHz. The GALI-84+ has a typical noise figure of approximately 3.5 dB at 1 GHz. For low-noise applications, the GALI-84+ generally offers better noise performance, but the exact value depends on frequency and bias conditions as specified in the datasheets.
What supply voltage and bias current do GALI-3+ and GALI-84+ require?
Both devices are biased through the RF output pin with an external resistor and bypass capacitor. The GALI-3+ typically operates with a supply voltage of 5 V and a bias current of approximately 35 mA. The GALI-84+ typically operates with a supply voltage of 5 V and a bias current of approximately 60 mA. The exact bias resistor value depends on the supply voltage and desired current, as detailed in the Mini-Circuits datasheets.
Which applications are better suited for GALI-84+ versus GALI-3+?
The GALI-84+ is better suited for applications requiring higher gain, higher output power, and lower noise figure, such as driver amplifiers and low-noise gain stages in receivers. The GALI-3+ is suitable for general-purpose wideband amplification where moderate gain and output power are sufficient, and where lower bias current is preferred. Selection should be based on the specific requirements of the RF chain.