component
SN74HC257PWR
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.
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
markdownSN74HC257PWR
Texas Instruments · Signal Switches, Multiplexers, Decoders · TSSOP-16
SN74HC257PWR from Texas Instruments, 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 | A/B | input | Active-low-referenced address/select input common to all four multiplexers; selects data source A (low) or B (high) for the Y outputs. |
| 2 | 1A | input | Data input A for multiplexer channel 1, selected when A/B select input is low. |
| 3 | 1B | input | Data input B for multiplexer channel 1, selected when A/B select input is high. |
| 4 | 1Y | tri_state | 3-state non-inverted output of multiplexer channel 1; driven to high-impedance when G is high, otherwise outputs the selected A or B data with up to ±6-mA drive at 5 V. |
| 5 | 2A | input | Data input A for multiplexer channel 2, selected when A/B select input is low. |
| 6 | 2B | input | Data input B for multiplexer channel 2, selected when A/B select input is high. |
| 7 | 2Y | tri_state | 3-state non-inverted output of multiplexer channel 2; driven to high-impedance when G is high, otherwise outputs the selected A or B data with up to ±6-mA drive at 5 V. |
| 8 | GND | power_in | Ground reference supply pin for the device. |
| 9 | 3Y | tri_state | 3-state non-inverted output of multiplexer channel 3; driven to high-impedance when G is high, otherwise outputs the selected A or B data with up to ±6-mA drive at 5 V. |
| 10 | 3B | input | Data input B for multiplexer channel 3, selected when A/B select input is high. |
| 11 | 3A | input | Data input A for multiplexer channel 3, selected when A/B select input is low. |
| 12 | 4Y | tri_state | 3-state non-inverted output of multiplexer channel 4; driven to high-impedance when G is high, otherwise outputs the selected A or B data with up to ±6-mA drive at 5 V. |
| 13 | 4B | input | Data input B for multiplexer channel 4, selected when A/B select input is high. |
| 14 | 4A | input | Data input A for multiplexer channel 4, selected when A/B select input is low. |
| 15 | G | input | Active-low output-enable/strobe input; a high level forces all four Y outputs into the high-impedance state, and it should be tied to VCC through a pull-up resistor during power-up/down. |
| 16 | VCC | power_in | Positive supply voltage pin, operating over a range of 2 V to 6 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-16 |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
SN74HC257PWR - Footprint:
Package_SO:TSSOP-16_4.4x5mm_P0.65mm - 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files:
sn74hc257pwr-etched.step/sn74hc257pwr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74hc257pwr.step/sn74hc257pwr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (29 pp, sha256
d8caefbacd746d02, retrieved 2026-09-24, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-sonnet-5(text+vision), consensusclaude-opus-4-8(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).