TMUX8108 - 100V Flat RON 8:1 MUX | Texas Instruments
MPN: TMUX8108 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.47 | $1,235.00 |
| 1,000 | $2.19 | $2,190.00 |
TMUX8108 Overview
An analog multiplexer is a device that routes one of several input signals to a common output based on digital control signals. In a single-ended 8:1 configuration, the TMUX8108 selects one of eight input channels and connects it to a single output. This functionality is essential in data acquisition systems, test equipment, and industrial automation where multiple sensors or signals need to be sampled sequentially by a single ADC or measurement circuit. The multiplexer acts as a signal router, enabling efficient use of expensive analog-to-digital converters and reducing component count.
Key features of the TMUX8108 include a flat RON of 50 ohm, which minimizes distortion and ensures consistent performance across the input voltage range. The device provides latch-up immunity, preventing damage from overvoltage or overcurrent conditions. It supports a wide supply range up to 100 V, making it suitable for high-voltage industrial and automotive applications. The logic inputs are compatible with 1.8 V, 3.3 V, and 5 V systems, allowing direct interface with modern microcontrollers without level shifters.
Technically, the TMUX8108 is built on a high-voltage CMOS process that enables low leakage currents and fast switching times. The flat RON characteristic is achieved through careful design of the switch architecture, ensuring that the on-resistance remains nearly constant across the entire analog input range. This reduces signal distortion and improves accuracy in precision measurement systems. The device also features break-before-make switching to prevent momentary shorting of channels during transitions.
Typical applications include data acquisition systems, automated test equipment, industrial process control, and battery monitoring systems. In data acquisition, the TMUX8108 allows a single ADC to sample multiple sensor channels, reducing cost and board space. In battery monitoring, it can route individual cell voltages to a measurement circuit, enabling accurate state-of-charge estimation. The high-voltage capability makes it ideal for automotive 48 V systems and industrial 24 V or 48 V buses.
When designing with the TMUX8108, ensure that the supply voltages are within the absolute maximum ratings and that the logic control signals are properly referenced to the logic supply. The device requires careful PCB layout to minimize parasitic capacitance and maintain signal integrity, especially in high-frequency applications. Additionally, consider the on-resistance and leakage current when calculating system accuracy, as these parameters affect the overall measurement error.
Drop-in alternatives for TMUX8108 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TMUX8108 (same form factor and footprint) — differing in Configuration, On-Resistance (RON), Package, Supply Configuration.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TMUX8108PWR
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →TMUX8109PWR
⚡ Same Package📋 Reference alternative (not in catalog)
MUX80X-Q1
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.2 / Unit
View Datasheet →ADG5208
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX14778
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TMUX8108 Specifications
| Configuration | Single 8:1 |
| Maximum Supply Voltage | 100 V |
| On-Resistance (RON) | 50 ohm |
| Flat RON | Yes |
| Latch-Up Immunity | Yes |
| Logic Level Support | 1.8 V, 3.3 V, 5 V |
| Logic Input Voltage Range | Up to 48 V |
| Supply Configuration | Dual, Single, or Asymmetric |
| Package | 16-TSSOP |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
TMUX8108 Pin Configuration
| Pin 1 | S1 — Source input 1 |
| Pin 2 | S2 — Source input 2 |
| Pin 3 | S3 — Source input 3 |
| Pin 4 | S4 — Source input 4 |
| Pin 5 | S5 — Source input 5 |
| Pin 6 | S6 — Source input 6 |
| Pin 7 | S7 — Source input 7 |
| Pin 8 | S8 — Source input 8 |
| Pin 9 | D — Drain output |
| Pin 10 | EN — Enable (active high) |
| Pin 11 | A0 — Address input 0 |
| Pin 12 | A1 — Address input 1 |
| Pin 13 | A2 — Address input 2 |
| Pin 14 | VSS — Negative supply |
| Pin 15 | VDD — Positive supply |
| Pin 16 | GND — Ground |
Typical Applications
TMUX8108 is suitable for 6 applications: Data Acquisition Systems, Automated Test Equipment, Industrial Process Control, Battery Monitoring Systems, Automotive Electronics, Medical Instrumentation.
Data Acquisition Systems
The TMUX8108 enables a single ADC to sample multiple sensor channels in high-voltage data acquisition systems. Its 100-V supply capability and flat 50-ohm RON ensure accurate signal routing with minimal distortion. The device supports 1.8-V logic, allowing direct interface with low-power microcontrollers. In a typical system, the multiplexer sequentially connects each sensor to the ADC, reducing component count and cost. The latch-up immunity protects against overvoltage transients, enhancing system reliability in industrial environments.
Recommended
Automated Test Equipment
In automated test equipment (ATE), the TMUX8108 routes multiple test signals to a single measurement instrument. Its high-voltage rating (100 V) allows testing of power electronics and automotive modules. The flat RON ensures consistent signal integrity across the test range, critical for accurate measurements. The device's fast switching and break-before-make action prevent channel crosstalk. With support for 1.8-V logic, it integrates seamlessly with FPGA-based test controllers. The 16-TSSOP package saves board space in dense ATE designs.
Recommended
Industrial Process Control
The TMUX8108 is ideal for industrial process control systems that monitor multiple analog signals from sensors such as temperature, pressure, and flow. Its 100-V supply capability accommodates 24-V and 48-V industrial buses. The flat RON minimizes measurement error, ensuring accurate process monitoring. The device's latch-up immunity provides robustness against electrical noise and transients common in factory environments. With 1.8-V logic support, it can be directly controlled by modern PLCs and microcontrollers. The 16-TSSOP package is suitable for compact control modules.
Recommended
Battery Monitoring Systems
The TMUX8108 is well-suited for battery monitoring systems in electric vehicles and energy storage. Its 100-V rating allows it to handle individual cell voltages in high-voltage battery packs. The flat RON ensures accurate voltage measurement across the cell range, critical for state-of-charge estimation. The device supports bidirectional signals, enabling both voltage and temperature sensing. With latch-up immunity, it withstands transient conditions during charging and discharging. The 1.8-V logic interface simplifies connection to battery management ICs.
Recommended
Automotive Electronics
In automotive applications, the TMUX8108 can route signals from various sensors to an ECU's ADC. Its 100-V rating is suitable for 48-V mild-hybrid systems. The device's flat RON and low leakage ensure accurate sensor readings, essential for engine control and safety systems. Latch-up immunity provides reliability in harsh automotive environments. The 1.8-V logic support allows direct connection to automotive microcontrollers. The 16-TSSOP package is compact for space-constrained ECUs. For automotive-grade requirements, consider the MUX80X-Q1 variant.
Recommended
Medical Instrumentation
The TMUX8108 is used in medical instrumentation for routing multiple biosignals to a single ADC. Its high-voltage rating is not typically needed, but the flat RON and low leakage ensure accurate signal acquisition. The device's low distortion is critical for ECG, EEG, and other diagnostic equipment. Latch-up immunity enhances patient safety by preventing damage from electrostatic discharge. The 1.8-V logic support allows integration with low-power medical processors. The 16-TSSOP package is suitable for portable medical devices.
Recommended
Recommended Products Summary
Engineering reference data for TMUX8108 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TMUX8108PWR | TMUX8109PWR | MUX80X-Q1 | ADG5208 | MAX14778 |
|---|---|---|---|---|---|---|
| Package | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Maxim Integrated |
| Configuration | Single 8:1 | Single 8:1 | Dual 4:1 | Single 8:1 | Single 8:1 | Single 8:1 |
| Maximum Supply Voltage | 100 V | 100 V | 100 V | 100 V | 33 V | 36 V |
| On-Resistance | 50 ohm | 50 ohm | 50 ohm | 50 ohm | 10 ohm | 10 ohm |
| Logic Level Support | 1.8V, 3.3V, 5V | 1.8V, 3.3V, 5V | 1.8V, 3.3V, 5V | 1.8V, 3.3V, 5V | 2.3V to 5.5V | 1.8V to 5.5V |
| Latch-Up Immunity | Yes | Yes | Yes | Yes | No | No |
| Automotive Grade | No | No | No | Yes (AEC-Q100) | No | No |
Key Differentiators
- 100-V supply capability (vs ADG5208)
- Latch-up immunity (vs MAX14778)
- Flat RON of 50 ohm (vs ADG5208)
Design Notes
The TMUX8108 supports dual supplies up to 100 V. Ensure that the VDD and VSS pins are properly decoupled with 0.1 uF ceramic capacitors placed close to the pins. For asymmetric supplies, verify that the absolute maximum ratings are not exceeded. The device can operate with a single supply, but the logic inputs must be referenced to the appropriate supply rail.
For high-voltage applications, maintain adequate spacing between traces to prevent arcing. Use a solid ground plane to minimize noise. Place the TMUX8108 close to the ADC or load to reduce parasitic capacitance. For high-frequency signals, consider using controlled impedance traces and minimize via count.
Do not exceed the maximum supply voltage of 100 V. Ensure that the logic control signals do not exceed the specified range (up to 48 V). When using the device in multiplexing applications, verify that the break-before-make timing is sufficient to prevent channel crosstalk. Also, consider the on-resistance and leakage current when calculating system accuracy.
Compliance Information
RoHS compliant per TI product page. AEC-Q100 not applicable for standard version; automotive grade available in MUX80X-Q1.
