TMUX1208

@@ -0,0 +1,59 @@+# TMUX1208++**Texas Instruments** · Analog multiplexer · TSSOP-16++Routes one of eight analog inputs (S1-S8) to a single common pin (D) under a 3-bit address, a modern precision replacement for the classic 4051. It runs on a single 1.8 to 5.5 V rail or a dual supply down to VSS for bipolar signals, with low on-resistance, low leakage, and fast switching that keeps signal error small. An EN pin disconnects all channels. Good for multiplexing sensor and ADC front ends where the older CMOS muxes leak or distort.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | A0 | input | Address line 0. Controls the switch configuration (which Sx channel connects to D) per the truth table. 1.8 V logic compatible; VIH ≥ 1.49 V, VIL ≤ 0.87 V at VDD = 5 V. |+| 2 | EN | input | Active-high enable input. When low, all switches are turned off; when high, the A[2:0] address inputs determine which channel is on. Fail-safe logic tolerates control voltages before VDD is applied. |+| 3 | VSS | power_in | Negative power supply. Tie to GND for single-supply operation, or to a negative rail for bipolar signal switching. |+| 4 | S1 | bidirectional | Source pin 1. Bidirectional analog/digital switch terminal; can be input or output. Signal range: GND to VDD; RON ≈ 5 Ω typical at VDD = 5 V. |+| 5 | S2 | bidirectional | Source pin 2. Bidirectional analog/digital switch terminal; can be input or output. Signal range: GND to VDD; RON ≈ 5 Ω typical at VDD = 5 V. |+| 6 | S3 | bidirectional | Source pin 3. Bidirectional analog/digital switch terminal; can be input or output. Signal range: GND to VDD; RON ≈ 5 Ω typical at VDD = 5 V. |+| 7 | S4 | bidirectional | Source pin 4. Bidirectional analog/digital switch terminal; can be input or output. Signal range: GND to VDD; RON ≈ 5 Ω typical at VDD = 5 V. |+| 8 | D | bidirectional | Common drain pin. Bidirectional analog/digital terminal that connects to the selected Sx source per the A[2:0]/EN inputs. Signal range: GND to VDD. |+| 9 | S8 | bidirectional | Source pin 8. Bidirectional analog/digital switch terminal; can be input or output. Signal range: GND to VDD; RON ≈ 5 Ω typical at VDD = 5 V. |+| 10 | S7 | bidirectional | Source pin 7. Bidirectional analog/digital switch terminal; can be input or output. Signal range: GND to VDD; RON ≈ 5 Ω typical at VDD = 5 V. |+| 11 | S6 | bidirectional | Source pin 6. Bidirectional analog/digital switch terminal; can be input or output. Signal range: GND to VDD; RON ≈ 5 Ω typical at VDD = 5 V. |+| 12 | S5 | bidirectional | Source pin 5. Bidirectional analog/digital switch terminal; can be input or output. Signal range: GND to VDD; RON ≈ 5 Ω typical at VDD = 5 V. |+| 13 | VDD | power_in | Positive power supply, 1.08 V to 5.5 V. Connect a 0.1 µF to 10 µF decoupling capacitor between VDD and GND close to the pin. |+| 14 | GND | power_in | Ground (0 V) reference for the device. |+| 15 | A2 | input | Address line 2. Controls the switch configuration per the truth table. 1.8 V logic compatible. |+| 16 | A1 | input | Address line 1. Controls the switch configuration per the truth table. 1.8 V logic compatible. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 8:1 analog multiplexer |+| Channels | 8 (S1-S8) to 1 (D) |+| Address | 3-bit (A0-A2) + EN |+| Supply | 1.8-5.5 V single or +/-2.75 V dual |+| Leakage | Low (pA range) |+| Switching | Break-before-make |+| Package | TSSOP-16 |++## Ordering variants++- `TMUX1208PWR (TSSOP-16)`+- `TMUX1208RSVR (UQFN-16)`++## CAD (KiCad official)++- Symbol: `Analog_Switch:TMUX1208PW (KiCad official)`+- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`+- 3D model: TSSOP-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/tmux1208.pdf) (37 pp, sha256 `c2683e83f693c8d9`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/tmux1208-datasheet.pdf)

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