Nexperia USA Inc. 74HCT251PW,118

Overview

74HCT251PW,118 from Nexperia is an 8-input TTL-compatible multiplexer with complementary outputs (Y and Y), 3-state output enable (OE), and three binary select inputs (S0–S2). It operates from 4.5 V to 5.5 V, delivers propagation delay as low as 19 ns at VCC = 5 V/CL = 15 pF, and supports industrial temperature range (−40 °C to +125 °C). It is used in digital logic routing, data selector circuits, and bus interface control in embedded controllers.

For engineers reviewing the 74HCT251PW,118 datasheet, 74HCT251PW,118 pinout, 74HCT251PW,118 application, or 74HCT251PW,118 equivalent, this page provides verified functional identity, validated TSSOP16 pin mapping, confirmed static/dynamic electrical behavior, and real-world use context - all derived from Nexperia's official Rev. 7 product data sheet (March 2024).

Technical Context

The 74HCT251PW,118 implements a single-pole, 8-throw analog-style digital multiplexer using CMOS technology with TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V). Its non-inverting data path routes one of eight inputs (I0–I7) to complementary outputs based on S0–S2 address bits, while OE controls high-impedance tri-state output behavior.

It features input clamp diodes enabling safe interfacing to voltages exceeding VCC, meets JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V) standards, and provides ESD robustness per HBM (>2000 V) and CDM (>1000 V). Latch-up immunity exceeds 100 mA per JESD78 Class II Level B.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1); 16-pin surface-mount; body width 4.4 mm; lead pitch 0.65 mm; moisture sensitivity level (MSL) 1 per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-input multiplexer applications.

Compared with 74HC251PW,118 and SN74LS251DR, the 74HCT251PW,118 uniquely balances TTL input compatibility, 19 ns speed, −40 °C to +125 °C operation, and 46 pF dynamic power - making it optimal for modern embedded systems requiring robust 5 V logic integration without translation overhead.

Availability

74HCT251PW,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, microcontroller peripheral multiplexing, and digital test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT251PW,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on essential efficiency-enhancing components - including logic, discrete, and MOSFET devices - serving automotive, industrial, computing, and consumer markets with high-volume, high-reliability solutions.

The 74HCT251PW,118 belongs to Nexperia's 74HCT logic family, engineered specifically for seamless 5 V TTL-to-CMOS interfacing in space-constrained, thermally demanding applications where speed, power, and ruggedness are co-optimized.

FAQ

Is the 74HCT251PW,118 pin-compatible with the 74HC251PW,118?

Yes - both share identical TSSOP16 (SOT403-1) pinout, including I0–I7, S0–S2, OE, Y, Y, VCC, and GND assignments. The only functional difference lies in input threshold levels: 74HCT251 accepts TTL-compatible inputs (VIH ≥ 2.0 V), while 74HC251 requires CMOS-level inputs (VIH ≥ 3.15 V at VCC = 4.5 V). No PCB redesign is needed for substitution.

What is the maximum clock frequency supported for reliable multiplexing?

The device does not operate on a clock; it is combinational logic. However, its 19 ns typical propagation delay (In → Y) at VCC = 5 V and CL = 15 pF supports reliable data routing in systems with signal periods ≥ 38 ns - corresponding to a maximum effective switching rate of ~26 MHz in worst-case timing paths with setup/hold margins.

Can OE be left unconnected in always-enabled applications?

No - OE must be actively driven LOW for normal operation. Leaving OE floating risks undefined output states due to noise susceptibility. For permanent enable, tie OE directly to GND via a low-impedance connection; do not rely on pull-down resistors alone in noisy environments.

Does the 74HCT251PW,118 support hot-swap or live-insertion?

No - it lacks dedicated hot-swap protection circuitry. While input clamp diodes permit limited overvoltage tolerance, applying VCC before GND or sequencing OE before supply stabilization may cause latch-up or transient glitches. Power sequencing per manufacturer guidelines (GND first, then VCC, then control signals) is mandatory.