# SN74HCS266QPWRQ1

**Texas Instruments** · Logic Gates · TSSOP-14

SN74HCS266QPWRQ1 from Texas Instruments, in a TSSOP-14. 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 | 1A | input | Channel 1, Input A of the first XNOR gate, a Schmitt-trigger input. |
| 2 | 1B | input | Channel 1, Input B of the first XNOR gate, a Schmitt-trigger input. |
| 3 | 1Y | output | Channel 1, Output Y of the first XNOR gate, an open-drain output. |
| 4 | 2Y | output | Channel 2, Output Y of the second XNOR gate, an open-drain output. |
| 5 | 2A | input | Channel 2, Input A of the second XNOR gate, a Schmitt-trigger input. |
| 6 | 2B | input | Channel 2, Input B of the second XNOR gate, a Schmitt-trigger input. |
| 7 | GND | power_in | Ground reference for the device. |
| 8 | 3A | input | Channel 3, Input A of the third XNOR gate, a Schmitt-trigger input. |
| 9 | 3B | input | Channel 3, Input B of the third XNOR gate, a Schmitt-trigger input. |
| 10 | 3Y | output | Channel 3, Output Y of the third XNOR gate, an open-drain output. |
| 11 | 4Y | output | Channel 4, Output Y of the fourth XNOR gate, an open-drain output. |
| 12 | 4A | input | Channel 4, Input A of the fourth XNOR gate, a Schmitt-trigger input. |
| 13 | 4B | input | Channel 4, Input B of the fourth XNOR gate, a Schmitt-trigger input. |
| 14 | VCC | power_in | Positive supply, specified at 2V to 6V in the recommended operating conditions. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-14 |
| Category | Logic |
| Pins | 14 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | 2 | 5 | 6 | V |  | 4 |
| Ambient temperature | TA | -40 |  | 125 | °C |  | 4 |
| Input voltage | VI | 0 |  |  | V | Maximum printed as VCC | 4 |
| Output voltage | VO | 0 |  |  | V | Maximum printed as VCC | 4 |
| Supply voltage | VCC | -0.5 |  | 7 | V |  | 4 |
| Input clamp current | IIK | -20 |  | 20 | mA | VI < -0.5V or VI > VCC + 0.5V | 4 |
| Output clamp current | IOK | -20 |  | 20 | mA | VI < -0.5V or VI > VCC + 0.5V | 4 |
| Continuous output current | IO | -35 |  | 35 | mA | VO = 0 to VCC | 4 |
| Continuous current through VCC or GND |  | -70 |  | 70 | mA |  | 4 |
| Junction temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Junction-to-ambient thermal resistance (PW TSSOP) | RθJA |  | 151.7 |  | °C/W |  | 4 |
| Junction-to-case (top) thermal resistance (PW TSSOP) | RθJC(top) |  | 79.4 |  | °C/W |  | 4 |
| Junction-to-board thermal resistance (PW TSSOP) | RθJB |  | 94.7 |  | °C/W |  | 4 |
| Junction-to-top characterization parameter (PW TSSOP) | ΨJT |  | 25.2 |  | °C/W |  | 4 |
| Junction-to-board characterization parameter (PW TSSOP) | ΨJB |  | 94.1 |  | °C/W |  | 4 |
| Positive switching threshold | VT+ | 1.13 | 1.26 | 1.37 | V | VCC = 2V | 5 |
| Positive switching threshold | VT+ | 2.31 | 2.47 | 2.66 | V | VCC = 4.5V | 5 |
| Positive switching threshold | VT+ | 2.99 | 3.18 | 3.44 | V | VCC = 6V | 5 |
| Negative switching threshold | VT- | 0.55 | 0.62 | 0.71 | V | VCC = 2V | 5 |
| Negative switching threshold | VT- | 1.21 | 1.36 | 1.5 | V | VCC = 4.5V | 5 |
| Negative switching threshold | VT- | 1.56 | 1.79 | 1.99 | V | VCC = 6V | 5 |
| Hysteresis | ΔVT | 0.54 | 0.64 | 0.71 | V | VCC = 2V | 5 |
| Hysteresis | ΔVT | 0.94 | 1.11 | 1.27 | V | VCC = 4.5V | 5 |
| Hysteresis | ΔVT | 1.2 | 1.38 | 1.57 | V | VCC = 6V | 5 |
| High-level output voltage | VOH | 4 | 4.3 |  | V | IOH = -6mA, VCC = 4.5V | 5 |
| High-level output voltage | VOH | 5.4 | 5.75 |  | V | IOH = -7.8mA, VCC = 6V | 5 |
| Low-level output voltage | VOL |  | 0.002 | 0.1 | V | IOL = 20µA, VCC = 2V to 6V | 5 |
| Low-level output voltage | VOL |  | 0.18 | 0.3 | V | IOL = 4mA, VCC = 4.5V | 5 |
| Low-level output voltage | VOL |  | 0.22 | 0.33 | V | IOL = 7.8mA, VCC = 6V | 5 |
| Input leakage current | II | -1000 | 100 | 1000 | nA | VI = VCC or 0, VCC = 6V | 5 |
| Supply current | ICC |  | 0.1 | 2 | µA | VI = VCC or 0, IO = 0, VCC = 6V | 5 |
| Propagation delay A or B to Y | tpd |  | 14 | 40 | ns | CL = 50pF, VCC = 2V | 6 |
| Propagation delay A or B to Y | tpd |  | 6 | 17 | ns | CL = 50pF, VCC = 4.5V | 6 |
| Propagation delay A or B to Y | tpd |  | 5 | 16 | ns | CL = 50pF, VCC = 6V | 6 |
| Transition time | tt |  | 9 | 16 | ns | CL = 50pF, VCC = 2V | 6 |
| Transition time | tt |  | 5 | 9 | ns | CL = 50pF, VCC = 4.5V | 6 |
| Transition time | tt |  | 4 | 8 | ns | CL = 50pF, VCC = 6V | 6 |

## CAD (KiCad official)

- Symbol: `SN74HCS266QPWRQ1`
- Footprint: `Package_SO:TSSOP-14_4.4x5mm_P0.65mm`
- 3D model: TSSOP-14 (KiCad packages3D, STEP)
- 3D model files: `sn74hcs266qpwrq1-etched.step` / `sn74hcs266qpwrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74hcs266qpwrq1.step` / `sn74hcs266qpwrq1.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/sn74hcs266-q1) (26 pp, sha256 `897619857e6ceeb1`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-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).

[Datasheet PDF](docs/sn74hcs266qpwrq1-datasheet.pdf)