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MAX2640, MAX2641

300MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers

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Status Explanations for product status codes

Part Number Status
MAX2640 Active: In Production. But some versions of the family are Not Recommended for New Designs. See Ordering Information.
MAX2641 Active: In Production.


The MAX2640/MAX2641 are low-cost, ultra-low-noise amplifiers designed for applications in the cellular, PCS, GPS, and 2.4GHz ISM frequency bands. Operating from a single +2.7V to +5.5V supply, these devices consume only 3.5mA of current while providing a low noise figure, high gain, high input IP3, and an operating frequency range that extends from 300MHz to 2500MHz.

The MAX2640 is optimized for 300MHz to 1500MHz applications, with a typical performance of 15.1dB gain, input IP3 of -10dBm, and a noise figure of 0.9dB at 900MHz. The MAX2641 is optimized for 1400MHz to 2500MHz applications, with a typical performance of 14.4dB gain, an input IP3 of -4dBm, and a noise figure of 1.3dB at 1900MHz.

These devices are internally biased, eliminating the need for external bias resistors and chokes. In a typical application, the only external components needed are a two-element input match, input and output blocking capacitors, and a VCC bypass capacitor.

The MAX2640/MAX2641 are designed on a high-frequency, low-noise, advanced silicon-germanium process and are offered in the space-saving 6-pin SOT23 package.

Data Sheet

Download this datasheet in PDF formatDownload Rev 3 (PDF, 160kB)
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An evaluation board is available: MAX2640EVKIT, MAX2641EVKIT

Key Features

  • Wide Operating Frequency Range
    • MAX2640: 300MHz to 1500MHz
    • MAX2641: 1400MHz to 2500MHz
  • Low Noise Figure
    • MAX2640:
    • 0.9dB at 900MHz
    • MAX2641:
    • 1.2dB at 1575MHz
        1.3dB at 1900MHz
        1.5dB at 2450MHz
  • High Gain
    • MAX2640:
    • 15.1dB at 900MHz
    • MAX2641:
    • 15.7dB at 1575MHz
        14.4dB at 1900MHz
        13.5dB at 2450MHz
  • High Reverse Isolation
    • MAX2640:
    • 40dB at 900MHz
    • MAX2641:
    • 31dB at 1575MHz
        30dB at 1900MHz
        24dB at 2450MHz
  • +2.7V to +5.5V Single-Supply Operation
  • Low 3.5mA Supply Current
  • Ultra-Small SOT23-6 Package


  • 400MHz/900MHz/2.4GHz ISM-Band Radios
  • Cellular/PCS Handsets
  • Cordless Phones
  • GPS Receivers
  • Wireless Data
  • Wireless Local Area Networks (WLANs)

Key Specifications:

Low-Noise Amplifiers
Part Number RF Freq.
RF Freq.
Noise Figure
Input IP3
(mm x mm)
min max See Notes
MAX2640  400 1500 0.9 15.1 -10 3.5 2.7 x 2.9 $0.81 @1k
MAX2641  1400 2500 1.3 14.4 -4 5.3
See All Low-Noise Amplifiers (37)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX2640, MAX2641: Typical Operating Circuit
Typical Operating Circuit

Notes and Comments

Low-Cost, Low-Noise SiGe LNA

More Information

Topmark Coding MAX2640
Topmark Coding MAX2641

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Document Ref.: 19-1384 Rev 3; 2007-05-29
This page last modified: 2007-06-01