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SN74AHCT540DWR
Public Made by Adomby adom
Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-20-300mil. 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
markdownSN74AHCT540DWR
Texas Instruments · Buffers, Drivers, Receivers, Transceivers · SOIC-20-300mil
SN74AHCT540DWR from Texas Instruments, in a SOIC-20-300mil. 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 | OE1 | input | Active-low Output Enable 1 input (0-5.5V logic); high level forces all Y outputs to high-impedance state |
| 2 | A1 | input | A1 input for buffer/driver channel 1; TTL-compatible (VIL ≤ 0.8V, VIH ≥ 2V) at VCC = 4.5-5.5V |
| 3 | A2 | input | A2 input for buffer/driver channel 2; TTL-compatible (VIL ≤ 0.8V, VIH ≥ 2V) at VCC = 4.5-5.5V |
| 4 | A3 | input | A3 input for buffer/driver channel 3; TTL-compatible (VIL ≤ 0.8V, VIH ≥ 2V) at VCC = 4.5-5.5V |
| 5 | A4 | input | A4 input for buffer/driver channel 4; TTL-compatible (VIL ≤ 0.8V, VIH ≥ 2V) at VCC = 4.5-5.5V |
| 6 | A5 | input | A5 input for buffer/driver channel 5; TTL-compatible (VIL ≤ 0.8V, VIH ≥ 2V) at VCC = 4.5-5.5V |
| 7 | A6 | input | A6 input for buffer/driver channel 6; TTL-compatible (VIL ≤ 0.8V, VIH ≥ 2V) at VCC = 4.5-5.5V |
| 8 | A7 | input | A7 input for buffer/driver channel 7; TTL-compatible (VIL ≤ 0.8V, VIH ≥ 2V) at VCC = 4.5-5.5V |
| 9 | A8 | input | A8 input for buffer/driver channel 8; TTL-compatible (VIL ≤ 0.8V, VIH ≥ 2V) at VCC = 4.5-5.5V |
| 10 | GND | power_in | Ground (0V logic reference); supports continuous current up to 75 mA |
| 11 | Y8 | tri_state | Y8 tri-state inverted output for channel 8; outputs inverted A8 data (IOL = 8 mA, IOH = −8 mA) when enabled by OE1 or OE2 low, high-impedance otherwise |
| 12 | Y7 | tri_state | Y7 tri-state inverted output for channel 7; outputs inverted A7 data (IOL = 8 mA, IOH = −8 mA) when enabled by OE1 or OE2 low, high-impedance otherwise |
| 13 | Y6 | tri_state | Y6 tri-state inverted output for channel 6; outputs inverted A6 data (IOL = 8 mA, IOH = −8 mA) when enabled by OE1 or OE2 low, high-impedance otherwise |
| 14 | Y5 | tri_state | Y5 tri-state inverted output for channel 5; outputs inverted A5 data (IOL = 8 mA, IOH = −8 mA) when enabled by OE1 or OE2 low, high-impedance otherwise |
| 15 | Y4 | tri_state | Y4 tri-state inverted output for channel 4; outputs inverted A4 data (IOL = 8 mA, IOH = −8 mA) when enabled by OE1 or OE2 low, high-impedance otherwise |
| 16 | Y3 | tri_state | Y3 tri-state inverted output for channel 3; outputs inverted A3 data (IOL = 8 mA, IOH = −8 mA) when enabled by OE1 or OE2 low, high-impedance otherwise |
| 17 | Y2 | tri_state | Y2 tri-state inverted output for channel 2; outputs inverted A2 data (IOL = 8 mA, IOH = −8 mA) when enabled by OE1 or OE2 low, high-impedance otherwise |
| 18 | Y1 | tri_state | Y1 tri-state inverted output for channel 1; outputs inverted A1 data (IOL = 8 mA, IOH = −8 mA) when enabled by OE1 or OE2 low, high-impedance otherwise |
| 19 | OE2 | input | Active-low Output Enable 2 input (0-5.5V logic); high level forces all Y outputs to high-impedance state |
| 20 | VCC | power_in | Positive power supply; recommended operating range 4.5 V to 5.5 V; supports continuous current up to 75 mA |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-20-300mil |
| Category | Logic |
| Pins | 20 |
CAD (KiCad official)
- Symbol:
SN74AHCT540DWR - Footprint:
Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm - 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
- 3D model files:
sn74ahct540dwr-etched.step/sn74ahct540dwr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74ahct540dwr.step/sn74ahct540dwr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (36 pp, sha256
98777c156119ae97, retrieved 2026-10-05, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).