Analog multiplexers · 8:1 CMOS switches selected by digital address lines, on-resistance, leakage current and charge injection, supply and signal range, break-before-make switching, logic thresholds and fail-safe inputs
An analog multiplexer is a set of electronic switches that connects one of multiple analog inputs to a single output, chosen by digital address (select) inputs; the CMOS parts cited here pass signals in both directions, so they can also demultiplex. Ask three things first: what signal voltage range and supply the switches must handle, how much on-resistance, leakage and charge injection the measurement can tolerate, and what logic levels and channel count the controller needs.
CMOS analog multiplexers and multiplexer/demultiplexers (for example 4:1, 8:1, 16:1 and dual configurations) for data acquisition, test equipment and industrial analog input modules. Single analog switches sold as such, digital data selectors, RF switches and multiplexer arrays inside data-acquisition ICs are outside this page except where compared.
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TI's TMUX1108 is a precision CMOS 8:1 multiplexer for a supply of 1.08–5.5 V or ±2.5 V, passing bidirectional analog and digital signals from GND to VDD on its source and drain pins; its logic inputs have 1.8 V-compatible thresholds for TTL and CMOS logic, fail-safe logic lets control voltages be applied before the supply, it switches break-before-make, operates from −40 to +125 °C, draws about 8 nA supply current and comes in a 16-pin TSSOP or a 2.6 × 1.8 mm QFN. [1] Nexperia's 74HC4051/74HCT4051 is a single-pole, eight-throw analog switch for 8:1 multiplexer or demultiplexer use with three select inputs and an enable input; it handles analog inputs from −5 to +5 V, includes logic level translation so 5 V logic can control ±5 V analog signals, has input clamp diodes and built-in break-before-make (typ.), and is specified from −40 to +85 °C and −40 to +125 °C. [2]
Editorial note: if your signals swing below ground, choose a part with a negative supply or a dual-supply rating, such as the 74HC4051's VEE pin or the TMUX1108's ±2.5 V mode, and keep signals within the supply rails.
Give the supplier the number of channels and configuration, signal voltage range and source impedance, supply rails, logic voltage, on-resistance and its flatness, leakage, charge injection, bandwidth, switching and settling time, break-before-make need, fault or overvoltage protection, ESD rating, package and temperature range.
02
The TMUX1108 lists 2.5 Ω on-resistance, 3 pA leakage current and 1 pC charge injection, and TI notes that low on and off leakage and low charge injection suit high-precision measurement. [1] The 74HC4051 lists on-resistance of 80 Ω (typ.) at VCC − VEE = 4.5 V, 70 Ω (typ.) at 6.0 V and 60 Ω (typ.) at 9.0 V. [2]
Editorial calculation: an 80 Ω switch driving a 1 MΩ input forms a divider with an error of about 80 / (1,000,000 + 80) ≈ 0.008%, but the same switch into a 1 kΩ load would lose about 7%. A 1 pC charge injection into a 1 nF hold capacitance makes a step of 1 pC / 1 nF = 1 mV. Load and capacitance values are assumed examples; check the data sheet's on-resistance across the signal range.
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Types include low-voltage precision multiplexers with very low leakage and charge injection, and general-purpose 74HC-family multiplexer/demultiplexers that can switch bipolar signals with a negative supply. [1] [2]
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Vishay's product page for the DG408 and DG409 describes 8-channel and dual 4-channel high-performance CMOS analog multiplexers and lists an on-resistance RDS(on) of 100 Ω, charge injection Q of 20 pC and transition time tTRANS of 160 ns, for data acquisition systems, audio signal routing and ATE systems. [3] Set beside the TMUX1108's 2.5 Ω and 1 pC, these figures show why a quotation should state the on-resistance, charge injection and transition time your channels can accept, not only the channel count. [1]
Editorial calculation: 20 pC injected into an assumed 1 nF hold capacitance gives a step of 20 pC / 1 nF = 20 mV, twenty times the 1 mV from 1 pC; a 100 Ω switch driving an assumed 1 MΩ input gives a divider error of about 100 / (1,000,000 + 100) ≈ 0.01%. The product page gives headline values only, so ask for the full data sheet's test conditions (supply, signal level and temperature) for each figure. [3]
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Renesas' datasheet for the HI-506, HI-507, HI-508 and HI-509 (FN3142 Rev 10.00, June 2016) covers a single 16-channel, an 8-channel differential, a single 8-channel and a 4-channel differential CMOS multiplexer. Each includes the analog switch array, a channel-select decoder, an internal +5 V reference that sets logic thresholds of at least 2.4 V for a 1 and at most 0.8 V for a 0 so TTL and CMOS logic connect without pull-ups, and an enable input for selecting one device when two or more are used. The datasheet lists an on-resistance of 180 Ω, an analog signal range of ±15 V, a 250 ns access time, a maximum supply of 44 V and break-before-make switching. Dielectric-isolation processing removes latch-up and lowers substrate leakage and parasitic capacitance; each digital input has a 200 Ω series resistor and diode clamps to the supplies. The parts are drop-in replacements for DG506A/DG507A and DG508A/DG509A types, are offered in grades from −55 to +125 °C, −40 to +85 °C and 0 to +75 °C, and Renesas recommends its HI-546 to HI-549 family where inputs may be overvoltaged. [4]
Editorial calculation: a 180 Ω switch into a 1 MΩ input gives about 0.018% error, but into a 1 kΩ load about 15%, so this class of part belongs in front of a buffer or high-impedance ADC input. Its ±15 V range covers industrial ±10 V sensor signals that a 5.5 V or ±2.5 V precision part cannot pass. Ask the supplier for on-resistance at your signal voltage and temperature, whether the part is a pin-compatible replacement for an older DG-series device, and its behaviour when inputs exceed the supplies. [4] [1]
| Parameter | HI-508 family | TMUX1108 |
|---|---|---|
| Signal range | ±15 V [4] | GND to VDD, 1.08–5.5 V or ±2.5 V [1] |
| On-resistance | 180 Ω [4] | 2.5 Ω [1] |
| Maximum supply | 44 V [4] | 5.5 V [1] |
| Switching | 250 ns access; break-before-make [4] | — |
| Logic thresholds | ≥2.4 V high; ≤0.8 V low [4] | 1.8 V logic [1] |
| Temperature grades | −55 to +125 °C; −40 to +85 °C; 0 to +75 °C [4] | −40 to +125 °C [1] |
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The logic interface row is where the two cited parts differ: 1.8 V thresholds on the TMUX1108, built-in level translation on the 74HC4051. [1] [2]
| Function | Role | Fix in the order |
|---|---|---|
| Switch array | Connects one input to the output. [1] [2] | Channels; Ron. |
| Select / address inputs | Choose the channel. [2] | Logic levels. |
| Enable input | Turns all switches off. [2] | Enable behaviour. |
| Logic interface | 1.8 V thresholds; level translation. [1] [2] | Logic voltage. |
| Protection | Clamp diodes; ESD; fail-safe logic. [1] [2] | Fault handling. |
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Leakage and charge injection have a single published example each, from the TMUX1108; ask for both at your temperature and signal range, since the other cited parts are quoted here only for on-resistance and range. [1]
| Field | What it means and published values | Ask the supplier for |
|---|---|---|
| Configuration | Example: 8:1. [1] [2] | Channels; dual or single. |
| Supply / signal range | Examples: 1.08–5.5 V or ±2.5 V; −5 to +5 V; ±15 V (44 V max supply). [1] [2] [4] | Range for your signals. |
| On-resistance | Examples: 2.5 Ω; 60–80 Ω (typ.); 180 Ω (±15 V part). [1] [2] [4] | Ron and flatness. |
| Leakage | Example: 3 pA. [1] | At temperature. |
| Charge injection | Example: 1 pC. [1] | Over signal range. |
| Temperature | Examples: −40 to +125 °C. [1] [2] | Grade. |
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Paste it into your enquiry below or into an email to a maker, then replace every bracket.
Channels: [count; configuration] Signals: [range; source impedance; bandwidth] Supply: [rails; logic level] Errors: [Ron; leakage; charge injection] Timing: [switching; settling] Package: [type; temperature]
Shanghai Awinic Technology Co., Ltd. lists analog switches and multiplexers in its signal-chain range, with part numbers such as the 2-channel 1:2 AW35321 and 4-channel 1:2 AWS35344.
Lists analog switches and multiplexers in its signal-chain range, including the 2-channel 1:2 AW35321 and 4-channel 1:2 AWS35344.
Product scope checked 2026-10-12
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It connects one of multiple analog inputs to one output under digital select control; the 74HC4051, for example, is an 8:1 multiplexer/demultiplexer. [2]
TI points to low leakage and low charge injection; the TMUX1108 lists 3 pA and 1 pC with 2.5 Ω on-resistance. [1]
With a negative supply: the 74HC4051 handles −5 to +5 V analog inputs. [2]
Vishay's DG408/DG409 product page lists a 160 ns transition time, with 100 Ω on-resistance and 20 pC charge injection. [3]
Dual-supply parts do: one 8- and 16-channel CMOS family lists a ±15 V signal range, 44 V maximum supply, 180 Ω on-resistance and 250 ns access time. [4]
Sources checked 2026-10-12. Texas Instruments and Nexperia are semiconductor makers describing their own multiplexers; their figures are examples, not limits for other parts.
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