# 74LCX126FT

**TOSHIBA** · Buffers, Drivers, Receivers, Transceivers · TSSOP-14

74LCX126FT from TOSHIBA, 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 | 1OE | input | 3-state control input for buffer 1, where low places 1Y in high impedance and high enables the output, with a 5-V tolerant input. |
| 2 | 1A | input | Data input of buffer 1 with 5-V tolerant input protection; unused inputs must be tied to VCC or GND. |
| 3 | 1Y | tri_state | 3-state output of buffer 1 that follows 1A when 1OE is high and is high impedance when 1OE is low, with |IOH|/IOL of 24 mA (min) at VCC = 3.0 V. |
| 4 | 2OE | input | 3-state control input for buffer 2, where low places 2Y in high impedance and high enables the output, with a 5-V tolerant input. |
| 5 | 2A | input | Data input of buffer 2 with 5-V tolerant input protection; unused inputs must be tied to VCC or GND. |
| 6 | 2Y | tri_state | 3-state output of buffer 2 that follows 2A when 2OE is high and is high impedance when 2OE is low, with |IOH|/IOL of 24 mA (min) at VCC = 3.0 V. |
| 7 | GND | power_in | Ground pin (0 V reference) for the device. |
| 8 | 3Y | tri_state | 3-state output of buffer 3 that follows 3A when 3OE is high and is high impedance when 3OE is low, with |IOH|/IOL of 24 mA (min) at VCC = 3.0 V. |
| 9 | 3A | input | Data input of buffer 3 with 5-V tolerant input protection; unused inputs must be tied to VCC or GND. |
| 10 | 3OE | input | 3-state control input for buffer 3, where low places 3Y in high impedance and high enables the output, with a 5-V tolerant input. |
| 11 | 4Y | tri_state | 3-state output of buffer 4 that follows 4A when 4OE is high and is high impedance when 4OE is low, with |IOH|/IOL of 24 mA (min) at VCC = 3.0 V. |
| 12 | 4A | input | Data input of buffer 4 with 5-V tolerant input protection; unused inputs must be tied to VCC or GND. |
| 13 | 4OE | input | 3-state control input for buffer 4, where low places 4Y in high impedance and high enables the output, with a 5-V tolerant input. |
| 14 | VCC | power_in | Positive supply pin with an operating range of 1.65 to 3.6 V and an absolute maximum of -0.5 to 6.5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TOSHIBA |
| 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 | -0.5 |  | 6.5 | V |  | 3 |
| Input voltage | VIN | -0.5 |  | 6.5 | V |  | 3 |
| Output voltage | VOUT | -0.5 |  | 6.5 | V | Note 3: VOUT < GND, VOUT > VCC | 3 |
| Input diode current | IIK | -50 |  |  | mA |  | 3 |
| Output diode current | IOK | -50 |  | 50 | mA |  | 3 |
| Output current | IOUT | -50 |  | 50 | mA |  | 3 |
| Power dissipation | PD |  |  | 180 | mW | Ta = -40 to 85 (Note 4) | 3 |
| VCC/ground current | ICC/IGND | -100 |  | 100 | mA |  | 3 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 3 |
| Supply voltage | VCC | 1.65 |  | 3.6 | V |  | 3 |
| Input voltage | VIN | 0 |  | 5.5 | V |  | 3 |
| Output voltage (OFF state) | VOUT | 0 |  | 5.5 | V | Note 2: Output in OFF state | 3 |
| Output current | IOH,IOL | -24 |  | 24 | mA | VCC = 3.0 to 3.6 V (Note 4) | 3 |
| Output current | IOH,IOL | -12 |  | 12 | mA | VCC = 2.7 to 3.0 V (Note 5) | 3 |
| Operating temperature | Topr | -40 |  | 125 | °C |  | 3 |
| Input rise and fall times | dt/dv | 0 |  | 10 | ns/V | VIN = 0.8 to 2.0 V, VCC = 3.0 V (Note 6) | 3 |
| High-level input voltage | VIH | 2 |  |  | V | VCC = 2.7 to 3.6 V, Ta = -40 to 85 | 4 |
| High-level input voltage | VIH | 1.7 |  |  | V | VCC = 2.3 to 2.7 V, Ta = -40 to 85 | 4 |
| Low-level input voltage | VIL |  |  | 0.8 | V | VCC = 2.7 to 3.6 V, Ta = -40 to 85 | 4 |
| Low-level input voltage | VIL |  |  | 0.7 | V | VCC = 2.3 to 2.7 V, Ta = -40 to 85 | 4 |
| Propagation delay time | tPLH,tPHL |  |  | 6 | ns | VCC = 3.3 ± 0.3 V, Ta = -40 to 85 | 5 |
| Input capacitance | CIN |  | 78 |  | pF | fIN = 10 MHz, VCC = 3.3 V, Ta = 25 °C | 6 |
| Output capacitance | COUT |  | 25 |  | pF | VCC = 3.3 V, Ta = 25 °C | 6 |
| Quiet output maximum dynamic VOL | VOLP |  | 0.8 |  | V | VCC = 3.3 V, VIH = 3.3 V, VIL = 0 V, Ta = 25 °C, tr = tf = 2.5 ns, CL = 50 pF, RL = 500 Ω | 4 |

## CAD (KiCad official)

- Symbol: `74LCX126FT`
- Footprint: `Package_SO:TSSOP-14_4.4x5mm_P0.65mm`
- 3D model: TSSOP-14 (KiCad packages3D, STEP)
- 3D model files: `74lcx126ft-etched.step` / `74lcx126ft-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74lcx126ft.step` / `74lcx126ft.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TOSHIBA datasheet](docs/74lcx126ft-datasheet.pdf) (10 pp, sha256 `354ccea9eaebb209`, retrieved 2026-10-17, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/74lcx126ft-datasheet.pdf)