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SN74LVC257APWR
Public Made by Adomby adom
Texas Instruments Signal Switches, Multiplexers, Decoders, TSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+52@@ -0,0 +1,52 @@+# SN74LVC257APWR++**Texas Instruments** · Signal Switches, Multiplexers, Decoders · TSSOP-16++SN74LVC257APWR from Texas Instruments, in a TSSOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | A/B | input | Select input; low selects channel A data, high selects channel B data; rated for 0 to VCC logic levels. |+| 2 | 1A | input | Multiplexer input A for output 1Y; accepts input signals from 0 to 5.5 V; input impedance 5 pF. |+| 3 | 1B | input | Multiplexer input B for output 1Y; accepts input signals from 0 to 5.5 V; input impedance 5 pF. |+| 4 | 1Y | tri_state | Tri-state multiplexer output for channel 1; VOH ≥ VCC − 0.2 V at IOH = −100 μA, VOL ≤ 0.2 V at IOL = 100 μA. |+| 5 | 2A | input | Multiplexer input A for output 2Y; accepts input signals from 0 to 5.5 V; input impedance 5 pF. |+| 6 | 2B | input | Multiplexer input B for output 2Y; accepts input signals from 0 to 5.5 V; input impedance 5 pF. |+| 7 | 2Y | tri_state | Tri-state multiplexer output for channel 2; VOH ≥ VCC − 0.2 V at IOH = −100 μA, VOL ≤ 0.2 V at IOL = 100 μA. |+| 8 | GND | power_in | Ground reference; return path for all device currents. |+| 9 | 3Y | tri_state | Tri-state multiplexer output for channel 3; VOH ≥ VCC − 0.2 V at IOH = −100 μA, VOL ≤ 0.2 V at IOL = 100 μA. |+| 10 | 3B | input | Multiplexer input B for output 3Y; accepts input signals from 0 to 5.5 V; input impedance 5 pF. |+| 11 | 3A | input | Multiplexer input A for output 3Y; accepts input signals from 0 to 5.5 V; input impedance 5 pF. |+| 12 | 4Y | tri_state | Tri-state multiplexer output for channel 4; VOH ≥ VCC − 0.2 V at IOH = −100 μA, VOL ≤ 0.2 V at IOL = 100 μA. |+| 13 | 4B | input | Multiplexer input B for output 4Y; accepts input signals from 0 to 5.5 V; input impedance 5 pF. |+| 14 | 4A | input | Multiplexer input A for output 4Y; accepts input signals from 0 to 5.5 V; input impedance 5 pF. |+| 15 | OE | input | Active-low output enable; when high, all Y outputs enter tri-state; when low, outputs driven; 0 to VCC logic levels. |+| 16 | VCC | power_in | Positive power supply voltage; operating range 1.65 V to 3.6 V; add 0.1 μF bypass capacitor per pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | TSSOP-16 |+| Category | Logic |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `SN74LVC257APWR`+- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`+- 3D model: TSSOP-16 (KiCad packages3D, STEP)+- 3D model files: `sn74lvc257apwr-etched.step` / `sn74lvc257apwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74lvc257apwr.step` / `sn74lvc257apwr.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/sn74lvc257a.pdf) (39 pp, sha256 `79a39fc53062a5a3`, retrieved 2026-09-17, tier: manufacturer)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/sn74lvc257apwr-datasheet.pdf)
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