TMUX8108RUMR - 100V 8:1 Analog Mux, 48Ohm | Texas Instruments
MPN: TMUX8108RUMR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.97 | $9.97 |
| 10 | $9.47 | $94.70 |
| 100 | $8.98 | $898.00 |
| 500 | $8.53 | $4,265.00 |
| 1,000 | $8.11 | $8,110.00 |
Drop-in alternatives for TMUX8108RUMR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TMUX8108QRUMRQ1
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
TMUX8108RUMR Maximum Ratings & Electrical Characteristics
| Function | Single 8:1 analog multiplexer |
| Maximum Supply Voltage | 100 V |
| On-Resistance (RON) | 48 ohm |
| Supply Configuration | Dual, single, or asymmetric supplies |
| Logic Compatibility | 1.8 V logic |
| Latch-Up Immunity | Yes |
| Number of Circuits | 1 |
| Configuration | 8:1 (single-ended) |
| Package | 16-WQFN (4x4 mm) |
| Mounting Type | Surface Mount |
| Product Family | TMUX810x |
TMUX8108RUMR 16-wqfn (4x4 mm) Pin Configuration Guide
Complete pinout information for TMUX8108RUMR (16-wqfn (4x4 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for TMUX8108RUMR.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TMUX8108RUMR is suitable for 6 applications: Industrial PLC Analog Input Modules, Battery Test and Formation Systems, Automated Test Equipment (ATE) Signal Routing, High-Voltage Data Acquisition Front Ends, Medical Diagnostic Instrument Signal Multiplexing, Audio and Instrumentation Signal Switching.
Industrial PLC Analog Input Modules
The TMUX8108RUMR fits PLC analog input front ends because industrial channels routinely see high common-mode voltages and transient excursions. Its 100 V supply capability and latch-up immunity allow the mux to survive miswiring and inductive kick events that destroy conventional 5 V or 36 V multiplexers. The 48 ohm flat RON keeps channel-to-channel gain error consistent, which matters when an 8-channel module shares one ADC and one gain calibration. The 1.8 V-compatible control lines connect directly to low-voltage MCU GPIOs without level shifting. Place the mux before a buffer amplifier and budget 48 ohm times input leakage as an offset term; with the low OFF leakage of the TMUX810x family this error is typically negligible, but it should be verified in the datasheet tables at your supply condition.
Recommended
Battery Test and Formation Systems
Battery formation and test equipment measures individual cells or series stacks whose voltages can reach tens of volts, well beyond standard mux ratings. The TMUX8108RUMR supports up to 100 V total supply, covering many pack architectures with headroom, and its flat 48 ohm RON across the signal range prevents voltage-dependent measurement error as cells charge and discharge. Latch-up immunity is particularly valuable in this environment because pack connection events generate spikes that exceed normal rails. The 8:1 configuration lets one precision measurement chain scan multiple channels, cutting ADC count and cost. Designers should route cell-sense lines with guard traces and verify that the datasheet leakage specification at the operating supply voltage meets the required measurement accuracy, for example 1 mV resolution on a 4 V cell.
Recommended
Automated Test Equipment (ATE) Signal Routing
In ATE and rack instruments, the TMUX8108RUMR serves as a high-voltage signal router switching stimulus or measurement lines between test points. Its 100 V rating handles backplane and device-under-test voltages that exceed conventional switch cards, while consistent analog parametric performance across the supply range ensures predictable insertion loss and settling time regardless of signal level. The 48 ohm RON must be added to the source impedance when calculating settling time into an ADC's sample capacitor; at moderate source capacitances this remains well within typical test-cycle budgets. The 16-WQFN (4x4 mm) package allows dense channel multiplexing on switch-motherboard layouts. For highest measurement integrity, follow the TI datasheet layout guidance on grounding the unused source and drain paths to reduce crosstalk between adjacent channels.
Recommended
High-Voltage Data Acquisition Front Ends
Multi-channel high-voltage monitoring systems - such as DC bus supervision, photovoltaic string monitoring, and motor-drive sensing - use the TMUX8108RUMR to share one precision conversion chain across eight sense points. The 100 V supply capability means the mux itself can sit directly in the high-voltage domain, avoiding isolation stages that would otherwise be required with low-voltage switches. Its 1.8 V logic interface integrates cleanly with modern microcontroller-based acquisition controllers. The flat RON characteristic means calibration constants remain valid across the whole input range, simplifying system-level accuracy budgets. Designers should power the mux from a rail just above the highest monitored voltage and ensure break-before-make switching behavior, specified in the TI TMUX810x datasheet timing tables, prevents momentary channel-to-channel shorting during scan transitions.
Recommended
Medical Diagnostic Instrument Signal Multiplexing
Diagnostic instruments such as impedance analyzers, electrophysiology front ends, and point-of-care analyzers often require routing multiple sensor or electrode signals into one measurement chain. The TMUX8108RUMR's consistent analog performance and low leakage preserve signal fidelity in these precision paths, while the 100 V rating provides comfortable margin and robustness for instruments with high-voltage stimulation modes, such as bioimpedance excitation. The 8:1 single-ended configuration matches multi-electrode architectures where channels are scanned sequentially. Because medical designs demand deterministic switching, designers should consult the TI TMUX810x datasheet timing specifications and add settling time between channel switch and ADC sampling. The compact 4x4 mm WQFN supports portable and handheld instrument form factors where board area is limited.
Recommended
Audio and Instrumentation Signal Switching
Professional audio test gear and precision instrumentation consoles benefit from the TMUX8108RUMR's flat RON, which avoids the signal-level-dependent distortion that curved-RON switches introduce. When used to switch audio or sensor signals between gain stages, the 48 ohm on-resistance appears in series with a high-impedance load, so the voltage division error is small and constant across the signal swing - preserving linearity and total harmonic distortion performance. The 100 V supply headroom also accommodates professional +24 dBu and higher signal levels without clipping risk at the switch itself. The 1.8 V logic interface suits modern DSP-controlled routing architectures. For lowest crosstalk, follow the TI datasheet recommendation to keep unused channels tied to a low-impedance mid-rail or ground reference rather than floating.
Recommended
Recommended Products Summary
Engineering reference data for TMUX8108RUMR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TMUX8108QRUMRQ1 | TMUX8108PWR |
|---|---|---|---|
| Package | 16-WQFN (4x4 mm, RUM) | 16-WQFN (4x4 mm, RUM) - same | TSSOP-16 - different footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Configuration | Single 8:1 (single-ended) | Single 8:1 | Single 8:1 |
| Max Supply Voltage | 100 V | 100 V | 100 V |
| On-Resistance | 48 ohm | 48 ohm | 48 ohm |
| Logic Compatibility | 1.8 V logic | 1.8 V logic | 1.8 V logic |
| Latch-Up Immunity | Yes | Yes | Yes |
| AEC-Q100 Qualification | No | Yes (automotive grade) | No |
| Drop-in on Same Footprint | N/A (reference) | Yes - pin-to-pin, same package | No - TSSOP-16 land pattern differs |
Key Differentiators
- 100 V supply capability with flat RON architecture (vs TMUX8108PWR)
- Latch-up immunity in industrial transients (vs Older high-voltage mux architectures)
- 1.8 V logic compatibility (vs Legacy high-voltage muxes requiring 3.3 V/5 V logic)
Design Notes
The TMUX8108 supports dual, single, or asymmetric supplies up to 100 V total. Configure the rails so the analog signal range at the source/drain pins always stays within the supply envelope, including transients. When using asymmetric supplies, the total supply (e.g., VDD to VSS) must not exceed the 100 V absolute maximum. Budget the 48 ohm RON against channel current to calculate series voltage drop and resulting measurement error, and verify the datasheet leakage at your exact supply configuration for offset-error budgets.
Place a 100 nF ceramic decoupling capacitor within 2-3 mm of each supply pin, plus a bulk 1-10 uF capacitor nearby. For the 16-WQFN (4x4) RUM package, connect the exposed thermal pad to a solid ground pour with an array of thermal vias - this improves both thermal relief and low-inductance grounding, which reduces switching-charge injection into neighboring channels. Keep high-voltage sense traces routed with adequate creepage/clearance per your product's safety requirements, and keep mux control lines away from analog signal paths to avoid digital coupling.
A frequent mistake is treating the TMUX8108PWR (TSSOP-16) as a drop-in for the RUM (WQFN-16) footprint - they are electrically identical but package-incompatible. Also confirm break-before-make switching delay from the TI TMUX810x datasheet timing tables before scanning multiple channels into an ADC; sampling too early causes cross-channel charge sharing. Finally, do not float unused source channels: tie them to a defined low-impedance potential to minimize crosstalk and uncontrolled leakage.
Compliance Information
Compliance status not stated in provided web data; verify on TI.com product page for TMUX8108RUMR. The automotive TMUX8108Q1 variant is AEC-Q100 qualified.
