74HC245PW

@@ -0,0 +1,61 @@+# 74HC245PW++**Nexperia** · Buffer/Driver/Transceiver · TSSOP-20++74HC245PW from Nexperia, 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 | DIR | input | Direction control input. LOW routes data from Bn (input) to An (output); HIGH routes data from An (input) to Bn (output). CMOS-level input; VIH >= 0.7*VCC (74HC). |+| 2 | A0 | tri_state | Bidirectional data pin, port A bit 0. Acts as input when DIR=HIGH and as 3-state output when DIR=LOW (with OE=LOW). High-impedance when OE=HIGH. |+| 3 | A1 | tri_state | Bidirectional data pin, port A bit 1. Direction set by DIR; enabled by OE (active LOW). |+| 4 | A2 | tri_state | Bidirectional data pin, port A bit 2. Direction set by DIR; enabled by OE (active LOW). |+| 5 | A3 | tri_state | Bidirectional data pin, port A bit 3. Direction set by DIR; enabled by OE (active LOW). |+| 6 | A4 | tri_state | Bidirectional data pin, port A bit 4. Direction set by DIR; enabled by OE (active LOW). |+| 7 | A5 | tri_state | Bidirectional data pin, port A bit 5. Direction set by DIR; enabled by OE (active LOW). |+| 8 | A6 | tri_state | Bidirectional data pin, port A bit 6. Direction set by DIR; enabled by OE (active LOW). |+| 9 | A7 | tri_state | Bidirectional data pin, port A bit 7. Direction set by DIR; enabled by OE (active LOW). |+| 10 | GND | power_in | Ground reference (0 V). Absolute max ground current IGND = -70 mA. |+| 11 | B7 | tri_state | Bidirectional data pin, port B bit 7. Direction set by DIR (HIGH: An->Bn output, LOW: Bn input); enabled by OE (active LOW). |+| 12 | B6 | tri_state | Bidirectional data pin, port B bit 6. Direction set by DIR; enabled by OE (active LOW). |+| 13 | B5 | tri_state | Bidirectional data pin, port B bit 5. Direction set by DIR; enabled by OE (active LOW). |+| 14 | B4 | tri_state | Bidirectional data pin, port B bit 4. Direction set by DIR; enabled by OE (active LOW). |+| 15 | B3 | tri_state | Bidirectional data pin, port B bit 3. Direction set by DIR; enabled by OE (active LOW). |+| 16 | B2 | tri_state | Bidirectional data pin, port B bit 2. Direction set by DIR; enabled by OE (active LOW). |+| 17 | B1 | tri_state | Bidirectional data pin, port B bit 1. Direction set by DIR; enabled by OE (active LOW). |+| 18 | B0 | tri_state | Bidirectional data pin, port B bit 0. Direction set by DIR; enabled by OE (active LOW). |+| 19 | OE | input | Output enable, active LOW. LOW enables the transceiver (direction per DIR); HIGH forces both A and B ports to high-impedance OFF-state. |+| 20 | VCC | power_in | Positive supply voltage. 74HC245: 2.0 V to 6.0 V (recommended); absolute max 7 V. Recommended 4.5-5.5 V for 74HCT variant. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Nexperia |+| Package | TSSOP-20 |+| Category | Logic |+| Pins | 20 |++## Ordering variants++- `74HC245PWPW`+- `74HC245PWD`+- `74HC245PWBQ`++## CAD (KiCad official)++- Symbol: `74HC245PW`+- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`+- 3D model: TSSOP-20 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/74HC245PW.pdf) (15 pp, sha256 `ff2562c806a0fc87`, 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).++[Datasheet PDF](docs/74hc245pw-datasheet.pdf)

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