TMUX8108PWR - 100V Flat RON 8:1 Analog MUX | Texas Instruments
MPN： TMUX8108PWR ✓ 啟用中TMUX8108PWR 概覽
An analog multiplexer is a switching IC that routes one of several analog signal inputs to a single common output under digital control, forming part of the broader family of analog switches within signal-chain and power-management integrated circuits. Multiplexers are essential wherever many sensors, test points, or signal sources share a single downstream amplifier, ADC, or measurement instrument, saving board area, cost, and channel count on data converters.
Key differentiating features of the TMUX8108 include its 100-V maximum supply rating, far above the 36 V ceiling of conventional CMOS multiplexers, its flat RON characteristic that minimizes signal-dependent gain error across the signal range, and latch-up immunity that protects the device in harsh industrial and medical environments where voltage transients are common. Control logic accepts 1.8 V, 3.3 V, and 5 V levels and, according to TI product documentation, logic inputs can be driven as high as 48 V, giving designers exceptional flexibility in interfacing with mixed-voltage systems.
The device supports bidirectional analog and digital signals on the source (Sx) and drain (D) pins and provides break-before-make switching to prevent momentary channel shorting. Consistent analog parametric performance is maintained across the entire supply voltage range, simplifying design reuse from low-voltage to high-voltage systems.
Typical applications include industrial programmable logic controller analog input modules, battery test and formation equipment, medical diagnostic instrumentation front ends, and automated test equipment (ATE) signal routing, all of which benefit from the high supply ceiling and rugged latch-up immunity.
Designers should observe the total supply constraint of 100 V across VDD and VSS and verify signal swing stays within the supply rails; the flat RON makes channel-to-channel matching predictable even at high common-mode voltages.
This page synthesizes verified distributor data, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet, with pricing referenced as of 2026-09-03.
直接替換替代品，適用於 TMUX8108PWR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TMUX8108PWR （相同外形與佔位） — 差異在於 Configuration, On-Resistance (RON), Package, Supply Configuration.
TMUX8108PWR-Q1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TMUX8109PWR
✅ 直接替換📋 參考替代品（不在目錄中）
ADG5208YRUZ
✅ 直接替換📋 參考替代品（不在目錄中）
MAX14778ATP+T
✅ 直接替換📋 參考替代品（不在目錄中）
MUX508IPWR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TMUX8108PWR 最大額定值與電氣特性
| 功能 | Single 8:1 analog multiplexer |
| Maximum Supply Voltage | 100 V |
| Supply Configuration | Single, dual, or asymmetric supplies |
| On-Resistance (RON) | 50 ohm (typ, flat across signal range) |
| Logic Compatibility | 1.8 V, 3.3 V, 5 V logic inputs |
| Maximum Logic Input Voltage | 48 V |
| Latch-Up Immunity | Yes |
| Signal Routing | Bidirectional analog and digital on Sx and Dx pins |
| Configuration | Single-ended 8:1 |
| 工作溫度 | -40C to +125C |
| 封裝 | 16-TSSOP (PWR) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
TMUX8108PWR 16-tssop (pwr) 腳位配置指南
TMUX8108PWR（16-tssop (pwr) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： TMUX8108PWR.
請參閱 資料表 以查看完整腳位配置。
典型應用
TMUX8108PWR 適用於 6 應用s: Industrial PLC Analog Input Modules, Battery Test and Formation Equipment, Medical Diagnostic Instrumentation, Automated Test Equipment (ATE), Data Acquisition and Sensor Multiplexing, Motor Drive and Power Monitoring Front Ends.
Industrial PLC Analog Input Modules
The TMUX8108PWR fits programmable logic controller (PLC) analog input cards that must multiplex many field sensor signals into a single ADC. Industrial field wiring routinely sees common-mode voltages near 24 V to 48 V and unprotected transient events, which exceed the 36 V ceiling of standard CMOS multiplexers but sit well inside the TMUX8108PWR's 100 V supply rating. Its flat 50 ohm RON keeps channel-to-channel gain errors consistent across all eight inputs, preserving calibration accuracy of the input card without per-channel software correction. The latch-up immunity specification protects the switch against the mis-wiring and surge events common on factory floors. Place the mux directly upstream of a precision ADC driver, use the 1.8 V/3.3 V logic interface from the module microcontroller, and rely on break-before-make switching to prevent momentary shorting of live field channels during transitions.
推薦
Battery Test and Formation Equipment
Battery cyclers and formation systems measure cell voltages across stacks that can exceed 48 V, and the TMUX8108PWR's 100 V total supply rating covers these stacks comfortably. The flat 50 ohm RON is critical here: cell-voltage measurement accuracy of a few millivolts demands that switch resistance not vary with the cell's position in the stack, which is exactly what the flat-RON architecture guarantees across the analog range. Bidirectional signal support on the Sx and D pins lets the same channel network serve both measurement and balancing/discharge paths. Latch-up immunity withstands the hot-plug transients that occur when battery packs are connected and disconnected during production test. Route cell taps through the eight source pins to a differential precision ADC, keep a bleed resistor at the mux output so the drain node is defined when a channel is off, and sequence the enable pin with the channel address to guarantee break-before-make behavior.
推薦
Medical Diagnostic Instrumentation
Medical diagnostic front ends, including patient-connected measurement systems and in-vitro analyzers, require signal switching that survives defibrillation-level transients and fault conditions; this is the classic use case for the TMUX8108PWR's latch-up immunity. The 100 V supply rating provides wide safety margin over the physiological signal range, while the flat 50 ohm RON maintains a consistent series impedance so bio-potential amplifier gain calibration remains valid across all eight sensor channels. The 1.8 V logic compatibility allows direct control from low-voltage medical-grade microcontrollers without level-shifting circuitry that would add leakage paths in the signal chain. Implement the mux ahead of an instrumentation amplifier, pay attention to off-state leakage when multiplexing high-impedance electrode signals, and use guard rings around the source pins on the PCB to preserve the low-leakage performance required by patient-monitoring accuracy standards.
推薦
Automated Test Equipment (ATE)
Automated test equipment routes many test points into a small number of measurement instruments, and the TMUX8108PWR serves as a high-voltage-capable channel selector in these switch matrices. Its 100 V rating allows direct connection to DUT rails that often reach 48 V or higher, eliminating the protective dividers that would otherwise add loading and measurement error. The flat 50 ohm RON introduces a predictable, signal-independent series impedance, which simplifies error budgeting across the full span of measured voltages - a significant advantage over older high-voltage muxes whose RON varies with common mode. The 48 V logic-input tolerance lets address lines come directly from industrial control backplanes. For measurement integrity, characterize the mux's on-resistance and leakage in series with the instrument input impedance, and enable only one channel at a time to prevent DUT channels from shorting through the device.
推薦
Data Acquisition and Sensor Multiplexing
In multi-channel data acquisition (DAQ) systems, the TMUX8108PWR lets a single high-resolution ADC sample up to eight sensors, cutting ADC cost and channel-count complexity. The consistent analog parametric performance across the supply range means channel characterization done at one operating point remains valid system-wide, easing calibration of thermocouple, pressure, and strain-gauge inputs that swing widely in common-mode voltage. Because the device routes bidirectional signals on Sx and D pins, the same network can support both sensor excitation routing and signal return paths in ratiometric measurement schemes. The 1.8 V address inputs connect directly to modern low-power MCU GPIOs used in battery-powered loggers. Minimize settling error by allowing adequate acquisition time after each channel switch for the 50 ohm RON plus source impedance RC network to settle, and keep the off-channel source pins AC-grounded via sensor output impedance to reduce crosstalk.
推薦
Motor Drive and Power Monitoring Front Ends
High-voltage motor drives and solar/DC bus monitoring systems measure phase voltages, bus voltages, and shunt currents that reference potentials well above ground, often near 48 V or higher. The TMUX8108PWR's 100 V supply ceiling allows the multiplexer to sit directly in these high-common-mode measurement points when powered from an appropriately isolated supply, reducing the number of isolated amplifiers needed. Its latch-up immunity is valuable in drive environments where dv/dt events and inductive kickbacks are routine. The flat 50 ohm RON keeps the error introduced into shunt-measurement paths small and constant. Sample each monitored node through the mux into a delta-sigma or SAR ADC, synchronize channel switching with the PWM cycle to sample at consistent points, and verify that the analog signal range stays within the VDD-VSS rails at all times to avoid conduction through the device's ESD structures.
推薦
推薦產品摘要
工程參考資料，適用於 TMUX8108PWR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TMUX8108PWR-Q1 | TMUX8109PWR | ADG5208YRUZ | MAX14778ATP+T | MUX508IPWR |
|---|---|---|---|---|---|---|
| Package | 16-TSSOP (PWR) | 16-TSSOP (PWR) - same | 16-TSSOP (PWR) - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP (PWR) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices (Maxim) | Texas Instruments |
| Configuration | Single 8:1 (single-ended) | Single 8:1 | Dual 4:1 (differential) | Single 8:1 | 8:1 multiplexer | Single 8:1 |
主要差異化特點
- 100 V total supply rating versus 36 V class alternatives (對比MUX508IPWR)
- Flat RON architecture versus varying-RON competitors (對比ADG5208YRUZ)
- Latch-up immunity for harsh environments (對比TMUX8109PWR)
設計說明
The TMUX8108PWR operates from single, dual, or asymmetric supplies up to 100 V total across VDD and VSS. Estimate: if configured with ±50 V dual rails, the analog signal range must stay within those rails; any signal excursion beyond the supply pins risks conduction through internal protection structures and possible device damage. Power the device from a clean, decoupled supply with at least 100 nF ceramic capacitance directly at VDD/VSS, and sequence supplies so the analog inputs are never energized before the rails are established.
The flat 50 ohm RON is a key accuracy asset, but it is still in series with your signal. Estimated settling time after a channel switch is governed by RON times the source and load capacitance; with a high-impedance sensor and an ADC input of 10 pF, the RC time constant is roughly 0.6 us, so allow several time constants of acquisition time for 16-bit settling. For high-impedance sources, buffer the drain pin with a precision op-amp to isolate the switch capacitance from the converter.
Place the 100 nF VDD decoupling capacitor within 2 mm of the supply pins and use a solid ground plane. Keep the analog source traces (S1-S8) away from the fast digital address lines (A0-A2) to prevent crosstalk-induced glitching during channel transitions; break-before-make switching helps, but layout crosstalk can still couple switching transients into adjacent channels. Guard high-impedance nodes with ground rings to control leakage and crosstalk on precision measurement paths.
Do not exceed 48 V on the logic input pins even though the device tolerates logic up to that level - driving logic pins from a bus without series protection invites damage during transients. Also remember that TMUX8108 is single-ended 8:1; designers needing differential routing should use TMUX8109 instead, since the two parts are not functionally interchangeable despite sharing the family name and package.
合規資訊
RoHS compliance per standard TI product offering; TMUX8108PWR-Q1 variant available for AEC-Q100 automotive requirements. REACH and halogen-free status not stated in provided data.
