Analog Devices Inc./Maxim Integrated MAX4649EKA+T

Overview

MAX4649EKA+T from Maxim Integrated is a dual-supply, single-pole/double-throw (SPDT) analog switch in an 8-pin SOT23 package. It features 45Ω max on-resistance, guaranteed break-before-make switching with ≤5ns delay, and rail-to-rail signal handling across ±4.5V to ±20V dual supplies or +9V to +36V single supply-used for signal routing in telecom test equipment and avionics systems.

For engineers reviewing the MAX4649EKA+T datasheet, MAX4649EKA+T pinout, MAX4649EKA+T application, or MAX4649EKA+T equivalent, key selection criteria include on-resistance flatness (≤7Ω), off-isolation (−92dB at 1MHz), crosstalk (−92dB), transition time (≤130ns), and TTL/CMOS-compatible control inputs without requiring a separate logic supply.

Technical Context

The MAX4649EKA+T uses CMOS switch architecture to support bidirectional analog/digital signal routing with break-before-make timing enforced by internal logic. Its dual-supply operation enables true rail-to-rail signal swing from V− to V+, while the absence of a dedicated VL pin simplifies system-level logic interfacing.

It delivers low charge injection (≤2pC), minimal on-resistance matching error (≤5Ω between channels), and stable performance over −40°C to +85°C-critical for high-fidelity switching in DSL line cards and redundant avionics signal paths where leakage (<2nA off-leakage at +25°C) and distortion (<0.015% THD) must be tightly controlled.

Key Specifications

Pinout & Package

MAX4649EKA+T is housed in an 8-pin SOT23 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. Thermal resistance θ_JA is 150°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SPDT analog switch applications.

Compared with MAX4649EKA+T, MAX4648EKA+T omits dual-supply capability but retains SOT23-8 compatibility, while ADG1419BRMZ offers improved speed and on-resistance at the cost of pinout change and mandatory VL rail-making MAX4649EKA+T optimal for space-constrained, dual-rail systems needing guaranteed break-before-make timing.

Availability

MAX4649EKA+T is available at Aetrix Electronics and suitable for telecom infrastructure, avionics subsystems, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4649EKA+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 high-voltage ICs for industrial, communications, and automotive applications-with emphasis on reliability, integration, and ruggedized performance.

The MAX4649 belongs to Maxim's high-voltage analog switch product line, engineered specifically for robust signal routing in telecom, test, and safety-critical systems where rail-to-rail operation, low leakage, and guaranteed switching behavior are mandatory.

FAQ

What supply configurations does the MAX4649EKA+T support?

The MAX4649EKA+T operates from either a single +9V to +36V supply or dual ±4.5V to ±20V supplies. It does not require a separate logic supply (VL), and its TTL/CMOS-compatible IN pin accepts standard 0V/3.3V or 0V/5V logic levels regardless of analog supply configuration. This flexibility makes MAX4649EKA+T suitable for both legacy ±15V test gear and modern single-rail industrial controllers.

Does the MAX4649EKA+T guarantee break-before-make switching?

Yes, the MAX4649EKA+T guarantees break-before-make switching with a maximum delay of 5ns across its full operating temperature range (−40°C to +85°C). This is achieved through internal timing control-not external circuitry-ensuring no overlap between NC and NO conduction. That behavior is critical in MAX4649EKA+T applications like relay replacement and redundant signal selection where momentary shorts must be avoided.

What is the maximum analog signal range supported by the MAX4649EKA+T?

The MAX4649EKA+T supports true rail-to-rail analog signals from V− to V+ under all specified supply conditions. With ±15V dual supplies, this means −15V to +15V; with +12V single supply, it is 0V to +12V. The device's CMOS construction and internal protection diodes allow safe operation at these extremes without signal clipping or damage-provided absolute maximum ratings (e.g., V+ to V− ≤ 44V) are observed in MAX4649EKA+T implementations.

How does the MAX4649EKA+T handle off-isolation and crosstalk at high frequencies?

The MAX4649EKA+T provides −92dB off-isolation and −92dB crosstalk at 1MHz, measured into 50Ω loads. However, off-isolation degrades above 5MHz due to capacitive coupling, especially with higher source/load impedances. For RF-sensitive designs, board layout-short traces, ground shielding, and proper decoupling-is essential. These characteristics are verified in MAX4649EKA+T typical operating curves and apply directly to telecom and ATE applications up to 10MHz.

Is the MAX4649EKA+T pin-compatible with other Maxim analog switches?

The MAX4649EKA+T shares the same 8-pin SOT23 footprint and pinout with MAX4648EKA+T (single-supply variant) and MAX4647EKA+T (SPST version), enabling direct substitution where supply and topology match. However, it is not pin-compatible with ADG1419BRMZ (MSOP-10) or TMUX6219 (WQFN-16), which differ in package, pin count, and logic interface requirements. Always verify supply configuration and signal routing before replacing with MAX4649EKA+T in existing layouts.