component
74LCX257MTCX
Public Made by Adomby adom
onsemi Signal Switches, Multiplexers, Decoders, TSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdown74LCX257MTCX
onsemi · Signal Switches, Multiplexers, Decoders · TSSOP-16
74LCX257MTCX from onsemi, in a TSSOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | S | input | Common Data Select input: LOW selects the I0x inputs and HIGH selects the I1x inputs. |
| 2 | I0a | input | Data input from Source 0 for channel a, selected when S is LOW. |
| 3 | I1a | input | Data input from Source 1 for channel a, selected when S is HIGH. |
| 4 | Za | tri_state | 3-STATE multiplexer output for channel a, high impedance when OE is HIGH. |
| 5 | I0b | input | Data input from Source 0 for channel b, selected when S is LOW. |
| 6 | I1b | input | Data input from Source 1 for channel b, selected when S is HIGH. |
| 7 | Zb | tri_state | 3-STATE multiplexer output for channel b, high impedance when OE is HIGH. |
| 8 | GND | power_in | Ground pin. |
| 9 | Zd | tri_state | 3-STATE multiplexer output for channel d, high impedance when OE is HIGH. |
| 10 | I1d | input | Data input from Source 1 for channel d, selected when S is HIGH. |
| 11 | I0d | input | Data input from Source 0 for channel d, selected when S is LOW. |
| 12 | Zc | tri_state | 3-STATE multiplexer output for channel c, high impedance when OE is HIGH. |
| 13 | I1c | input | Data input from Source 1 for channel c, selected when S is HIGH. |
| 14 | I0c | input | Data input from Source 0 for channel c, selected when S is LOW. |
| 15 | OE | input | Active-low 3-STATE output enable input: a HIGH level forces the outputs to high impedance. |
| 16 | VCC | power_in | Supply voltage pin, operating range 2.0 V to 3.6 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TSSOP-16 |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
74LCX257MTCX - Footprint:
Package_SO:TSSOP-16_4.4x5mm_P0.65mm - 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files:
74lcx257mtcx-etched.step/74lcx257mtcx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);74lcx257mtcx.step/74lcx257mtcx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (11 pp, sha256
f4ca62b37784aeca, retrieved 2026-10-27, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(vision), consensusclaude-opus-5-5(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).