Analog Devices Inc./Maxim Integrated MAX2631EUK+T

Overview

MAX2631EUK+T from Maxim Integrated is a VHF-to-microwave low-noise amplifier optimized for 800–1000MHz receive and IF buffer applications. It operates from +2.7V to +5.5V, delivers 13.4dB gain, exhibits 3.7dB noise figure, and draws 6.6mA supply current. Its integrated shutdown pin enables <1µA quiescent current in power-down mode for battery-sensitive wireless front-ends.

For engineers reviewing the MAX2631EUK+T datasheet, MAX2631EUK+T pinout, MAX2631EUK+T application, or MAX2631EUK+T equivalent, key selection criteria include its SOT23-5 package footprint, internally biased architecture eliminating external bias components, flat gain response up to 900MHz, and verified RF performance across -40°C to +85°C industrial temperature range.

Technical Context

The MAX2631EUK+T is a monolithic GaAs MMIC amplifier with internally generated bias, requiring no external resistors or inductors for DC biasing. Its 5-pin SOT23 package integrates GND, IN, OUT, VCC, and SHDN terminals, supporting direct integration into compact RF signal chains.

It features a dedicated shutdown control pin that reduces supply current to <1µA when driven low, enabling rapid on/off cycling without re-biasing delays. The device maintains stable 13.4dB small-signal gain and 3.7dB noise figure across 800–1000MHz at +3V supply, with input/output VSWR of 1.3:1 and 1.25:1 respectively.

Key Specifications

Pinout & Package

The MAX2631EUK+T is housed in a RoHS-compliant 5-pin SOT23-5 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and thermal pad exposed on bottom for enhanced RF grounding.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise amplifier applications.

Compared with QPL9057TR13 and SKY65111-378LF, the MAX2631EUK+T uniquely balances low-noise performance, micropower shutdown, industrial temperature range, and minimal external component count - making it optimal for cost- and size-constrained GPS, ISM, and cellular diversity designs where bias simplicity and power gating are critical.

Availability

MAX2631EUK+T is available at Aetrix Electronics and suitable for GPS receivers, cellular diversity modules, ISM-band sensor nodes, and digital TV tuners requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX2631EUK+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and RF ICs for industrial, communications, and consumer applications.

The MAX2630–MAX2633 family was developed specifically for compact, low-power VHF-to-microwave receive and IF amplification - targeting space-constrained wireless infrastructure and portable electronics.

FAQ

What is the maximum input power the MAX2631EUK+T can handle without damage?

The MAX2631EUK+T has an absolute maximum input power rating of +5dBm. Exceeding this level risks permanent degradation of the GaAs transistor structure. For reliable operation, keep RF input power ≤0dBm under continuous-wave conditions, and ensure transient spikes remain below +5dBm per the Absolute Maximum Ratings table. Always verify input signal envelope with a spectrum analyzer during prototype validation of the MAX2631EUK+T.

Does the MAX2631EUK+T require external bias components?

No, the MAX2631EUK+T uses fully internal bias circuitry - no external resistors, inductors, or capacitors are needed for DC biasing. Only three external components are required: input and output DC-blocking capacitors (typically 100pF–1nF depending on lowest operating frequency), and a VCC bypass capacitor (≥100pF). This eliminates tuning complexity and improves production yield for the MAX2631EUK+T.

What is the typical output 1dB compression point (P1dB) of the MAX2631EUK+T?

The MAX2631EUK+T has a typical output 1dB compression point of -11dBm at 900MHz and +3V supply. This value remains stable across temperature (-40°C to +85°C) and supply voltage (2.7V to 5.5V), making it suitable for linear amplification in low-power receive paths. P1dB degrades by ~0.5dB per 100MHz increase in frequency above 900MHz, as confirmed in the MAX2631EUK+T Typical Operating Characteristics graphs.

Can the MAX2631EUK+T operate at 1.8V supply?

No, the MAX2631EUK+T is not specified or guaranteed for operation below +2.7V. Its internal bias generator and amplifier core require minimum 2.7V to maintain 13.4dB gain, 3.7dB noise figure, and stable shutdown functionality. Attempting 1.8V operation results in gain collapse, increased noise, and unreliable SHDN pin response - all outside datasheet specifications for the MAX2631EUK+T.

Is the MAX2631EUK+T pin-compatible with other parts in the MAX2630–MAX2633 family?

The MAX2631EUK+T shares the same 5-pin SOT23-5 package and pinout (GND, IN, OUT, VCC, SHDN) with the MAX2632EUK+T, but differs functionally: MAX2632 requires an external bias resistor on its BIAS pin, while MAX2631EUK+T has no BIAS pin and uses internal biasing. Therefore, MAX2631EUK+T is not pin-compatible with MAX2632/MAX2633 - direct substitution would leave the BIAS pin unconnected or cause functional failure.