Texas Instruments TMUX1208PWR

Overview

TMUX1208PWR from Texas Instruments is a 5-V bidirectional 8:1 single-channel analog/digital multiplexer IC used for signal routing in mixed-signal systems. It features rail-to-rail operation, 5 Ω typical on-resistance at 5 V, 1.08 V to 5.5 V supply range, 1.8 V logic compatibility, and break-before-make switching - enabling precise channel selection in data acquisition, sensor interface, and MCU peripheral expansion applications.

For engineers reviewing the TMUX1208PWR datasheet, TMUX1208PWR pinout, TMUX1208PWR application, or TMUX1208PWR equivalent, key selection criteria include its 8:1 single-ended topology, low 14 ns transition time at 5 V, fail-safe logic for power sequencing robustness, and support for industrial temperature range (–40°C to +125°C) in TSSOP-16 package.

Technical Context

The TMUX1208PWR implements a CMOS-based 1-of-8 decoder architecture with three address inputs (A0–A2) and an active-high enable (EN) controlling bidirectional conduction between one drain (D) and eight source terminals (S1–S8). Its switch core operates across the full supply range without level-shifting, supporting analog signals from GND to VDD.

All logic inputs feature 1.8 V-compatible thresholds (VIH = 1.49 V min at –40°C to +125°C), ensuring TTL/CMOS interoperability. Fail-safe logic allows control pins to be driven before VDD is applied, preventing latch-up during power-up sequences in battery-powered or hot-plug systems.

Key Specifications

Pinout & Package

TMUX1208PWR is housed in a 16-pin TSSOP (PW) package measuring 5.00 mm × 4.40 mm, optimized for automated PCB assembly and thermal performance in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMUX1208RTER, TMUX1208PWR offers identical electrical performance with easier hand-soldering and visual inspection due to TSSOP leads; compared with ADG1408BRUZ, it delivers 2.4× faster transition time and 58% lower on-resistance at 5 V, making it optimal for battery-powered and high-resolution ADC interfacing.

Availability

TMUX1208PWR is available at Aetrix Electronics and suitable for industrial sensor interfaces, battery-powered data loggers, and MCU peripheral expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TMUX1208PWR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in power management and signal chain solutions.

The TMUX1208PWR belongs to TI's precision analog multiplexer portfolio, designed specifically for low-distortion, low-power signal routing in industrial automation, building control, and portable instrumentation systems.

FAQ

What is the maximum operating voltage for TMUX1208PWR?

The TMUX1208PWR supports a recommended operating supply voltage from 1.08 V to 5.5 V. Absolute maximum rating is 6 V on VDD and logic pins. Operation above 5.5 V risks permanent damage and violates JEDEC specifications - always limit VDD to ≤5.5 V in production designs. The TMUX1208PWR maintains functional performance across this full range, including 1.2 V, 1.8 V, 3.3 V, and 5 V systems.

Does TMUX1208PWR support bidirectional signal flow?

Yes, TMUX1208PWR is fully bidirectional: signals pass equally well from any Sx pin to D or from D to any Sx pin, with identical on-resistance (5 Ω typ) and capacitance characteristics in both directions. This enables flexible use in data acquisition (sensor → MCU) and control (MCU → actuator) paths without redesign. The TMUX1208PWR datasheet confirms symmetrical RON, CSON/CDON, and leakage behavior.

How does fail-safe logic work on TMUX1208PWR?

Fail-safe logic in TMUX1208PWR ensures that control inputs (EN, A0–A2) remain inactive and do not cause unintended switching when VDD is absent or below 0.8 V. This prevents latch-up or shoot-through during power-up/down sequences. The TMUX1208PWR achieves this via internal clamping and threshold design - verified in TI's production testing per SCDS389C Rev C.

Can TMUX1208PWR operate with 1.2 V logic inputs?

No - TMUX1208PWR requires minimum VIH = 0.96 V at 1.2 V supply (per Section 7.8), but its logic thresholds are fixed and not scalable. At VDD = 1.2 V, VIH(min) = 0.96 V and VIL(max) = 0.36 V, meaning 1.2 V logic drivers meet spec. However, 1.2 V logic *signals* (e.g., from a 1.2 V IO bank) are compatible only if their VOH ≥ 0.96 V and VOL ≤ 0.36 V - which most 1.2 V CMOS outputs satisfy. The TMUX1208PWR is not 1.2 V logic *compatible* in the sense of adjustable thresholds, but functions correctly with standard 1.2 V IO.

What is the thermal resistance of TMUX1208PWR in TSSOP package?

The TMUX1208PWR in PW (TSSOP-16) package has a junction-to-ambient thermal resistance (RθJA) of 118.9°C/W under standard JEDEC JESD51-2 conditions. Its junction-to-board (RθJB) is 65.2°C/W, indicating effective heat transfer to the PCB copper. These values assume 2-layer board with 1-in² 2-oz copper pour under the package - actual performance depends on layout, airflow, and adjacent power components. The TMUX1208PWR remains within safe operating limits up to +125°C ambient when properly decoupled and routed.