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SN74AHC244PWR
Public Unreviewedby Ray
Texas Instruments Buffer/Driver/Transceiver, TSSOP-20. Datasheet-verified pinout, 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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Contents
README
markdownSN74AHC244PWR
Texas Instruments · Buffer/Driver/Transceiver · TSSOP-20
SN74AHC244PWR from Texas Instruments, in a TSSOP-20. 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 | 1OE | input | Active-low output enable for the 1Y1-1Y4 bank. When high, the 1Y outputs are in the high-impedance (Hi-Z) state. |
| 2 | 1A1 | input | Channel-1 buffer input 1. Drives 1Y1 output when 1OE is asserted low. |
| 3 | 2Y4 | tri_state | Channel-2 buffer output 4. Non-inverting drive of 2A4; Hi-Z when 2OE is high. |
| 4 | 1A2 | input | Channel-1 buffer input 2. Drives 1Y2 output when 1OE is asserted low. |
| 5 | 2Y3 | tri_state | Channel-2 buffer output 3. Non-inverting drive of 2A3; Hi-Z when 2OE is high. |
| 6 | 1A3 | input | Channel-1 buffer input 3. Drives 1Y3 output when 1OE is asserted low. |
| 7 | 2Y2 | tri_state | Channel-2 buffer output 2. Non-inverting drive of 2A2; Hi-Z when 2OE is high. |
| 8 | 1A4 | input | Channel-1 buffer input 4. Drives 1Y4 output when 1OE is asserted low. |
| 9 | 2Y1 | tri_state | Channel-2 buffer output 1. Non-inverting drive of 2A1; Hi-Z when 2OE is high. |
| 10 | GND | power_in | Ground reference (0 V) for the device. |
| 11 | 2A1 | input | Channel-2 buffer input 1. Drives 2Y1 output when 2OE is asserted low. |
| 12 | 1Y4 | tri_state | Channel-1 buffer output 4. Non-inverting drive of 1A4; Hi-Z when 1OE is high. |
| 13 | 2A2 | input | Channel-2 buffer input 2. Drives 2Y2 output when 2OE is asserted low. |
| 14 | 1Y3 | tri_state | Channel-1 buffer output 3. Non-inverting drive of 1A3; Hi-Z when 1OE is high. |
| 15 | 2A3 | input | Channel-2 buffer input 3. Drives 2Y3 output when 2OE is asserted low. |
| 16 | 1Y2 | tri_state | Channel-1 buffer output 2. Non-inverting drive of 1A2; Hi-Z when 1OE is high. |
| 17 | 2A4 | input | Channel-2 buffer input 4. Drives 2Y4 output when 2OE is asserted low. |
| 18 | 1Y1 | tri_state | Channel-1 buffer output 1. Non-inverting drive of 1A1; Hi-Z when 1OE is high. |
| 19 | 2OE | input | Active-low output enable for the 2Y1-2Y4 bank. When high, the 2Y outputs are in the high-impedance (Hi-Z) state. |
| 20 | VCC | power_in | Positive supply input. Operating range 2 V to 5.5 V; absolute maximum 7 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-20 |
| Category | Logic |
| Pins | 20 |
Ordering variants
Same part, different packaging or reel option.
SN74AHC244PWRSN74AHC244PWRDBSN74AHC244PWRDBRSN74AHC244PWRDWSN74AHC244PWRDWRSN74AHC244PWRNSN74AHC244PWRNESN74AHC244PWRNSSN74AHC244PWRNSRSN74AHC244PWRDGVSN74AHC244PWRDGVRSN74AHC244PWRDGSSN74AHC244PWRDGSRSN74AHC244PWRRKSSN74AHC244PWRRKSRSN74AHC244PWRJSN74AHC244PWRJTSN74AHC244PWRWSN74AHC244PWRFK
CAD (KiCad official)
- Symbol:
SN74AHC244PWR - Footprint:
Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm - 3D model: TSSOP-20 (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
sn74ahc244pwr.step |
267 KB | You want the bare part, or you mark your own boards. |
sn74ahc244pwr-etched.step |
2.8 MB | You want the part with SN74AHC244PWR already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 734 faces against 327 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (47 pp, sha256
62f9320050d2fc60, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).