Nexperia USA Inc. 74HC251PW,112

Overview

74HC251PW,112 from Nexperia is an 8-input CMOS multiplexer with complementary outputs (Y and Y), three binary select lines (S0–S2), and active-low 3-state output enable (OE). It operates from 2.0 V to 6.0 V, delivers propagation delay as low as 14 ns at VCC = 6.0 V, and supports industrial temperature range (−40 °C to +125 °C) in TSSOP16 package. It routes one of eight data inputs to dual outputs for digital signal routing in microcontroller I/O expansion and address decoding.

For engineers reviewing the 74HC251PW,112 datasheet, 74HC251PW,112 pinout, 74HC251PW,112 application, or 74HC251PW,112 equivalent, this page provides verified functional identity, validated pin mapping, confirmed timing specs (tpd, ten, tdis), real-world use cases in bus arbitration and logic-level translation, and two technically documented alternatives with precise interface differences.

Technical Context

The 74HC251PW,112 implements a non-inverting 8:1 multiplexer architecture with complementary outputs and tristate control. Its select logic decodes S2:S0 as a 3-bit binary address to route exactly one of I0–I7 to Y (true) and Y (inverted), while OE independently disables both outputs into high-impedance state.

Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Static input thresholds are CMOS-compatible (VIH ≥ 70% VCC, VIL ≤ 30% VCC), and dynamic performance is specified at CL = 50 pF with propagation delays tightly bounded across −40 °C to +125 °C.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-pin, body width 4.4 mm, lead pitch 0.65 mm, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC251D,653, the 74HC251PW,112 offers 25 % smaller PCB area and improved thermal dissipation in compact layouts; versus SN74LV251APWR, it supports wider voltage range and 5 V input tolerance-critical for mixed-supply industrial interfaces.

Availability

74HC251PW,112 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, address decoding in memory systems, logic-level translation interfaces, and bus arbitration in shared data paths requiring stable component supply across automotive, industrial, and computing applications.

Supply support for 74HC251PW,112 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 delivering high-performance logic, analog, and MOSFET solutions with focus on reliability, efficiency, and miniaturization for industrial and consumer electronics.

The 74HC251PW,112 belongs to Nexperia's HC logic family, engineered for low-power, high-noise-immunity digital routing in space-constrained and thermally demanding environments.

FAQ

What is the maximum clock frequency supported by the 74HC251PW,112?

The 74HC251PW,112 does not operate on a clock signal-it is a purely combinational device. Its usable data rate is determined by propagation delay (tpd ≤ 14 ns at VCC = 6.0 V) and load capacitance. With CL = 50 pF, it reliably handles input transitions up to ~35 MHz, assuming sufficient setup/hold margin for select lines.

Can the 74HC251PW,112 interface directly with 5 V TTL outputs?

Yes-the 74HC251PW,112 has CMOS input thresholds but includes input clamp diodes that allow safe connection to 5 V TTL outputs when used with a current-limiting resistor (e.g., 1 kΩ) on each input. This prevents forward-biasing the diodes beyond ±20 mA absolute maximum rating.

Is the Y output truly complementary to Y, or is it inverted logic only?

Y is the true (non-inverted) output of the selected input; Y is its exact logical complement-both outputs change simultaneously with identical propagation delay (tpd mismatch < 2 ns). The outputs are electrically isolated and can drive separate loads without cross-talk.

Does the 74HC251PW,112 require external pull-up resistors on OE or select lines?

No-OE and S0–S2 have no internal pull-ups or pull-downs. They must be actively driven to valid logic levels (VIL ≤ 0.5 V, VIH ≥ 4.2 V at VCC = 6.0 V); floating inputs will cause undefined output states and increased ICC due to input stage contention.