Analog Devices Inc./Maxim Integrated MAX4948ETG+T

Overview

MAX4948ETG+T from Maxim Integrated is a hex single-pole/double-throw (SPDT) analog switch IC designed for high-speed data routing in portable digital systems. It operates from a single +1.8V to +5.5V supply, delivers 4Ω typical on-resistance, 30pF typical off-capacitance, and supports rail-to-rail signal switching - enabling reliable SDIO, UART, and USB signal multiplexing in space-constrained handheld devices.

For engineers reviewing the MAX4948ETG+T datasheet, MAX4948ETG+T pinout, MAX4948ETG+T application, or MAX4948ETG+T equivalent, key selection criteria include its 24-pin TQFN-EP package, EN/CB dual-control logic architecture, guaranteed break-before-make timing (2ns), and -70dB off-isolation at 1MHz - critical for low-crosstalk, high-fidelity signal path management in multi-interface SoC designs.

Technical Context

The MAX4948ETG+T implements six independent SPDT switches with a shared digital control interface: one enable input (EN) and one bidirectional control input (CB). When EN is low, CB selects between NO_ (normally open) and NC_ (normally closed) paths for all six channels simultaneously; when EN is high, all switches enter high-impedance state regardless of CB level.

Its CMOS process ensures rail-to-rail analog signal handling (0V to VCC), 100mA continuous channel current rating, and stable on-resistance flatness (1.2Ω max) across the full signal range. The device guarantees 300MHz -3dB bandwidth and <0.2ns channel-to-channel skew - confirming suitability for high-speed digital interface switching where timing integrity and signal fidelity are essential.

Key Specifications

Pinout & Package

MAX4948ETG+T is housed in a 24-pin, 4mm × 4mm thermally enhanced TQFN-EP package with exposed paddle (EP) connected to GND for improved thermal performance and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4948ERA+T, MAX4948ETG+T offers superior thermal dissipation and mechanical robustness via its exposed paddle; compared with TMUX1574RTER, it provides hardware-enforced fail-safe isolation through the dedicated EN pin - reducing firmware complexity and improving system-level reliability during interface reconfiguration.

Availability

MAX4948ETG+T is available at Aetrix Electronics and suitable for SDIO multiplexing, USB 1.1 signal routing, and UART port sharing requiring stable component supply across consumer, industrial, and medical electronics programs.

Supply support for MAX4948ETG+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) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-reliability interface solutions for demanding embedded applications.

The MAX4948ETG+T belongs to Maxim's high-speed analog switch product line, engineered specifically for low-latency, low-distortion signal routing in portable digital systems with stringent size and power constraints.

FAQ

What is the maximum analog signal voltage range supported by the MAX4948ETG+T?

The MAX4948ETG+T supports rail-to-rail analog signals from 0V to VCC. When powered from +3.3V, it handles input/output voltages from 0V to +3.3V on all NO_, NC_, and COM_ pins. This capability eliminates external biasing components and ensures compatibility with standard CMOS logic levels across its 1.8V–5.5V supply range.

Does the MAX4948ETG+T require external pull-up or pull-down resistors on the EN or CB pins?

No, the MAX4948ETG+T does not require external biasing on EN or CB. Its digital inputs have defined VIH (1.6V min) and VIL (0.5V max) thresholds across temperature, and internal protection diodes clamp signals within safe limits. However, for noise immunity in noisy environments, a 100kΩ pull-down on EN and pull-up on CB is recommended to ensure deterministic startup behavior.

Can the MAX4948ETG+T be used to switch differential signals like USB D+/D−?

Yes, the MAX4948ETG+T is suitable for switching USB 1.1 full-speed differential pairs. Its matched on-resistance (ΔRON ≤ 0.6Ω), low skew (<0.2ns), and high off-isolation (-70dB) preserve differential signal integrity. Two SPDT channels should be used in parallel - one for D+, one for D− - with identical layout length and impedance control to maintain common-mode rejection.

What is the thermal performance difference between MAX4948ETG+T and MAX4948ERA+T?

The MAX4948ETG+T's 24-pin TQFN-EP package features an exposed paddle thermally connected to PCB ground, delivering significantly lower junction-to-board thermal resistance than the 25-bump UCSP package of MAX4948ERA+T. Under 100mA per channel, MAX4948ETG+T maintains ~15°C lower junction temperature - critical for sustained operation in enclosed handheld enclosures.

How does the break-before-make timing of the MAX4948ETG+T prevent signal contention?

The MAX4948ETG+T guarantees a minimum 2ns break interval between disconnecting one path (e.g., COM_ from NC_) and connecting to the alternate path (COM_ to NO_). This prevents momentary short-circuit conditions during switching - especially vital when routing bidirectional buses like SDIO or UART where simultaneous driver activation could cause latch-up or data corruption.