component
SN74HCT240NSR
Public Made by Adomby adom
Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-20-208mil. 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
markdownSN74HCT240NSR
Texas Instruments · Buffers, Drivers, Receivers, Transceivers · SOIC-20-208mil
SN74HCT240NSR from Texas Instruments, in a SOIC-20-208mil. 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 | 1OE | input | Output Enable 1 input (active low); controls tri-state outputs of section 1 buffers (1Y1-1Y4). |
| 2 | 1A1 | input | Input A1 for section 1 buffer; inverted output appears on 1Y1 when 1OE is low. |
| 3 | 2Y4 | tri_state | Tri-state output Y4 for section 2; drives inverted version of input 2A4 when 2OE is low, otherwise high impedance. |
| 4 | 1A2 | input | Input A2 for section 1 buffer; inverted output appears on 1Y2 when 1OE is low. |
| 5 | 2Y3 | tri_state | Tri-state output Y3 for section 2; drives inverted version of input 2A3 when 2OE is low, otherwise high impedance. |
| 6 | 1A3 | input | Input A3 for section 1 buffer; inverted output appears on 1Y3 when 1OE is low. |
| 7 | 2Y2 | tri_state | Tri-state output Y2 for section 2; drives inverted version of input 2A2 when 2OE is low, otherwise high impedance. |
| 8 | 1A4 | input | Input A4 for section 1 buffer; inverted output appears on 1Y4 when 1OE is low. |
| 9 | 2Y1 | tri_state | Tri-state output Y1 for section 2; drives inverted version of input 2A1 when 2OE is low, otherwise high impedance. |
| 10 | GND | power_in | Ground reference pin. |
| 11 | 2A1 | input | Input A1 for section 2 buffer; inverted output appears on 2Y1 when 2OE is low. |
| 12 | 1Y4 | tri_state | Tri-state output Y4 for section 1; drives inverted version of input 1A4 when 1OE is low, otherwise high impedance. |
| 13 | 2A2 | input | Input A2 for section 2 buffer; inverted output appears on 2Y2 when 2OE is low. |
| 14 | 1Y3 | tri_state | Tri-state output Y3 for section 1; drives inverted version of input 1A3 when 1OE is low, otherwise high impedance. |
| 15 | 2A3 | input | Input A3 for section 2 buffer; inverted output appears on 2Y3 when 2OE is low. |
| 16 | 1Y2 | tri_state | Tri-state output Y2 for section 1; drives inverted version of input 1A2 when 1OE is low, otherwise high impedance. |
| 17 | 2A4 | input | Input A4 for section 2 buffer; inverted output appears on 2Y4 when 2OE is low. |
| 18 | 1Y1 | tri_state | Tri-state output Y1 for section 1; drives inverted version of input 1A1 when 1OE is low, otherwise high impedance. |
| 19 | 2OE | input | Output Enable 2 input (active low); controls tri-state outputs of section 2 buffers (2Y1-2Y4). |
| 20 | VCC | power_in | Positive power supply pin; nominal 5V with operating range 4.5V to 5.5V per section 4.2. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-20-208mil |
| Category | Logic |
| Pins | 20 |
CAD (KiCad official)
- Symbol:
SN74HCT240NSR - Footprint:
Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm - 3D model: SOIC-20-208mil (KiCad packages3D, STEP)
- 3D model files:
sn74hct240nsr-etched.step/sn74hct240nsr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74hct240nsr.step/sn74hct240nsr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (30 pp, sha256
898d3fff8f0abec6, retrieved 2026-09-27, 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 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).