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74LCX257FT

Public Made by Adom

by adom

TOSHIBA Signal Switches, Multiplexers, Decoders, TSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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74LCX257FT

TOSHIBA · Signal Switches, Multiplexers, Decoders · TSSOP-16

74LCX257FT from TOSHIBA, in a TSSOP-16. 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 SELECT input Common select input: low enables the A data inputs, high enables the B data inputs.
2 1A input Channel 1 data input A, routed to 1Y when SELECT is low; 5-V tolerant.
3 1B input Channel 1 data input B, routed to 1Y when SELECT is high; 5-V tolerant.
4 1Y tri_state Channel 1 3-state output, high impedance when OE is high;
5 2A input Channel 2 data input A, routed to 2Y when SELECT is low; 5-V tolerant.
6 2B input Channel 2 data input B, routed to 2Y when SELECT is high; 5-V tolerant.
7 2Y tri_state Channel 2 3-state output, high impedance when OE is high;
8 GND power_in Ground (0 V) supply pin.
9 3Y tri_state Channel 3 3-state output, high impedance when OE is high;
10 3B input Channel 3 data input B, routed to 3Y when SELECT is high; 5-V tolerant.
11 3A input Channel 3 data input A, routed to 3Y when SELECT is low; 5-V tolerant.
12 4Y tri_state Channel 4 3-state output, high impedance when OE is high;
13 4B input Channel 4 data input B, routed to 4Y when SELECT is high; 5-V tolerant.
14 4A input Channel 4 data input A, routed to 4Y when SELECT is low; 5-V tolerant.
15 OE input Active-low output enable; when high the outputs are held in high impedance.
16 VCC power_in Supply voltage, operating range 1.65 to 3.6 V (absolute maximum -0.5 to 6.5 V).

Key specifications

Parameter Value
Manufacturer TOSHIBA
Package TSSOP-16
Category Logic
Pins 16

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 4
Input voltage VIN -0.5 6.5 V 4
Output voltage VOUT -0.5 6.5 V Note 1: output in OFF state 4
Output voltage VOUT -0.5 V Note 2: high or low state; upper limit printed as VCC + 0.5 V 4
Input diode current IIK -50 mA 4
Output diode current IOK -50 50 mA Note 3: VOUT < GND, VOUT > VCC 4
Output current IOUT -50 50 mA Note 2: high or low state 4
Power dissipation PD 180 mW Note 4: Ta = -40 to 85 °C; derate -3.25 mW/°C from 85 to 125 °C to 50 mW 4
VCC/ground current ICC/IGND -100 100 mA 4
Storage temperature Tstg -65 150 °C 4
Supply voltage VCC 1.65 3.6 V 4
Supply voltage (data retention) VCC 1.5 V Data retention only (Note 1) 4
Output voltage VOUT 0 5.5 V Note 2: output in OFF state 4
Output voltage VOUT 0 V Note 3: high or low state; upper limit printed as VCC 4
Output current IOH,IOL -24 24 mA VCC = 3.0 to 3.6 V (Note 4) 4
Output current IOH,IOL -12 12 mA VCC = 2.7 to 3.0 V (Note 5) 4
Operating temperature Topr -40 125 °C 4
Input rise and fall times dt/dv 0 10 ns/V VIN = 0.8 to 2.0 V, VCC = 3.0 V (Note 6) 4
High-level input voltage VIH 1.7 V VCC = 2.3 to 2.7 V; Ta = -40 to 85 °C 5
High-level input voltage VIH 2 V VCC = 2.7 to 3.6 V; Ta = -40 to 85 °C 5
Low-level input voltage VIL 0.7 V VCC = 2.3 to 2.7 V; Ta = -40 to 85 °C 5
Low-level input voltage VIL 0.8 V VCC = 2.7 to 3.6 V; Ta = -40 to 85 °C 5
High-level output voltage VOH 1.05 V IOH = -4 mA; VCC = 1.65 V; Ta = -40 to 85 °C 5
High-level output voltage VOH 1.7 V IOH = -8 mA; VCC = 2.3 V; Ta = -40 to 85 °C 5
High-level output voltage VOH 2.2 V IOH = -12 mA; VCC = 2.7 V; Ta = -40 to 85 °C 5
High-level output voltage VOH 2.4 V IOH = -18 mA; VCC = 3.0 V; Ta = -40 to 85 °C 5
Low-level output voltage VOL 0.2 V IOL = 100 µA; VCC = 1.65 to 3.6 V; Ta = -40 to 85 °C 5
Low-level output voltage VOL 0.45 V IOL = 4 mA; VCC = 1.65 V; Ta = -40 to 85 °C 5
Low-level output voltage VOL 0.7 V IOL = 8 mA; VCC = 2.3 V; Ta = -40 to 85 °C 5
Low-level output voltage VOL 0.4 V IOL = 12 mA; VCC = 2.7 V; Ta = -40 to 85 °C 5
Low-level output voltage VOL 0.55 V IOL = 24 mA; VCC = 3.0 V; Ta = -40 to 85 °C 5
Input leakage current IIN -5 5 µA VIN = 0 to 5.5 V; VCC = 1.65 to 3.6 V; Ta = -40 to 85 °C 5
Quiescent supply current (per input) ∆ICC 500 µA VIH = VCC - 0.6 V (per 1 input); VCC = 2.7 to 3.6 V; Ta = -40 to 85 °C 5
High-level input voltage VIH 1.7 V VCC = 2.3 to 2.7 V; Ta = -40 to 125 °C 6
High-level input voltage VIH 2 V VCC = 2.7 to 3.6 V; Ta = -40 to 125 °C 6
Low-level input voltage VIL 0.7 V VCC = 2.3 to 2.7 V; Ta = -40 to 125 °C 6
Low-level input voltage VIL 0.8 V VCC = 2.7 to 3.6 V; Ta = -40 to 125 °C 6
High-level output voltage VOH 0.9 V IOH = -4 mA; VCC = 1.65 V; Ta = -40 to 125 °C 6
High-level output voltage VOH 1.55 V IOH = -8 mA; VCC = 2.3 V; Ta = -40 to 125 °C 6
High-level output voltage VOH 2 V IOH = -12 mA; VCC = 2.7 V; Ta = -40 to 125 °C 6
High-level output voltage VOH 2.2 V IOH = -18 mA; VCC = 3.0 V; Ta = -40 to 125 °C 6
Low-level output voltage VOL 0.2 V IOL = 100 µA; VCC = 1.65 to 3.6 V; Ta = -40 to 125 °C 6
Low-level output voltage VOL 0.65 V IOL = 4 mA; VCC = 1.65 V; Ta = -40 to 125 °C 6
Low-level output voltage VOL 0.9 V IOL = 8 mA; VCC = 2.3 V; Ta = -40 to 125 °C 6
Low-level output voltage VOL 0.6 V IOL = 12 mA; VCC = 2.7 V; Ta = -40 to 125 °C 6
Low-level output voltage VOL 0.75 V IOL = 24 mA; VCC = 3.0 V; Ta = -40 to 125 °C 6
Input leakage current IIN -20 20 µA VIN = 0 to 5.5 V; VCC = 1.65 to 3.6 V; Ta = -40 to 125 °C 6
Quiescent supply current (per input) ∆ICC 5 mA VIH = VCC - 0.6 V (per 1 input); VCC = 2.7 to 3.6 V; Ta = -40 to 125 °C 6
Propagation delay time (A,B - Y) tPLH,tPHL 6 ns VCC = 3.3 ± 0.3 V; Ta = -40 to 85 °C; Fig. 12.8.1, Table 12.8.1 5
Propagation delay time (SELECT - Y) tPLH,tPHL 7 ns VCC = 3.3 ± 0.3 V; Ta = -40 to 85 °C; Fig. 12.8.1, Table 12.8.1 5
Output enable time tPZL,tPZH 7 ns VCC = 3.3 ± 0.3 V; Ta = -40 to 85 °C; Fig. 12.8.2, Table 12.8.1 5
Output disable time tPLZ,tPHZ 5.5 ns VCC = 3.3 ± 0.3 V; Ta = -40 to 85 °C; Fig. 12.8.2, Table 12.8.1 5
Propagation delay time (A,B - Y) tPLH,tPHL 7 ns VCC = 3.3 ± 0.3 V; Ta = -40 to 125 °C; Fig. 12.8.1, Table 12.8.1 7
Propagation delay time (SELECT - Y) tPLH,tPHL 8 ns VCC = 3.3 ± 0.3 V; Ta = -40 to 125 °C; Fig. 12.8.1, Table 12.8.1 7
Output enable time tPZL,tPZH 8 ns VCC = 3.3 ± 0.3 V; Ta = -40 to 125 °C; Fig. 12.8.2, Table 12.8.1 7
Output disable time tPLZ,tPHZ 6 ns VCC = 3.3 ± 0.3 V; Ta = -40 to 125 °C; Fig. 12.8.2, Table 12.8.1 7

CAD (KiCad official)

  • Symbol: 74LCX257FT
  • Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
  • 3D model: TSSOP-16 (KiCad packages3D, STEP)
  • 3D model files: 74lcx257ft-etched.step / 74lcx257ft-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 74lcx257ft.step / 74lcx257ft.glb are the bare package body.

Provenance

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

  • Datasheet: TOSHIBA datasheet (11 pp, sha256 1d247549b87461cf, retrieved 2026-10-18, 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