Nexperia USA Inc. 74AHC257PW,118

Overview

74AHC257PW,118 from Nexperia is a quad 2-input CMOS multiplexer with 3-state outputs, designed for data routing in mixed-voltage digital systems. It features overvoltage-tolerant inputs (up to 5.5 V), Schmitt-trigger inputs for noise immunity, non-inverting data path, and operates across 2.0 V–5.5 V supply range. Used in bus interface logic, address/data selection, and signal routing in industrial control and instrumentation.

For engineers reviewing the 74AHC257PW,118 datasheet, 74AHC257PW,118 pinout, 74AHC257PW,118 application, or 74AHC257PW,118 equivalent, key selection criteria include its 3-state output enable timing (t_en/t_dis ≤ 12.5 ns at V_CC = 5.5 V), input voltage compatibility (CMOS-level), and TSSOP16 package suitability for high-density PCB layouts.

Technical Context

The device implements four independent 2:1 multiplexers sharing a common select line (S) and a single active-low output enable (OE). Each channel routes either I0 or I1 to Y based on S state, with outputs entering high-impedance when OE is HIGH. All inputs exhibit Schmitt-trigger action, ensuring robust switching under slow or noisy signal edges.

It supports dual-voltage translation: inputs tolerate up to 5.5 V regardless of V_CC, enabling interfacing between 3.3 V logic and 5 V peripherals. The non-inverting architecture preserves signal polarity, and propagation delays are balanced across channels (t_pd ≤ 7.5 ns at V_CC = 5.5 V, CL = 15 pF).

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; RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input multiplexer applications.

Compared with 74AHCT257PW,118, the AHC version offers superior noise immunity and wider supply flexibility but requires CMOS-level inputs; versus SN74LVC257PWR, it trades lower voltage operation for robust 5.5 V tolerance and faster switching at 5 V - critical for mixed-supply industrial backplanes.

Availability

74AHC257PW,118 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded computing requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.

Supply support for 74AHC257PW,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 delivering high-performance, reliable components for automotive, industrial, and consumer applications, with leadership in logic, MOSFETs, and ESD protection.

This device belongs to Nexperia's AHC logic family - engineered for high-speed, low-power data routing in mixed-voltage digital systems where signal integrity and supply flexibility are critical.

FAQ

What is the maximum clock frequency supported by the 74AHC257PW,118 for data routing?

The device does not operate on a clock; it is combinational logic. Its usable data rate depends on propagation delay and load capacitance. With t_pd ≤ 7.5 ns (V_CC = 5.5 V, CL = 15 pF), it supports clean signal routing up to ~100 MHz in well-terminated, low-capacitance paths. System-level timing must account for board trace delays and fanout.

Can the 74AHC257PW,118 safely interface a 3.3 V microcontroller with a 5 V peripheral bus?

Yes. Its inputs tolerate up to 5.5 V regardless of V_CC, so 5 V peripheral signals can drive the I0/I1/S/OE pins directly when V_CC = 3.3 V. Outputs swing rail-to-rail (0 V to 3.3 V), so level-shifting is required if the peripheral needs 5 V logic levels - the device itself does not translate output voltage.

Is the 74AHC257PW,118 pin-compatible with the older 74HC257?

Yes - identical pinout and function across SO16 and TSSOP16 packages. However, the AHC version offers improved parameters: lower propagation delay (7.5 ns vs. 15 ns typical), wider V_CC range (2.0–5.5 V vs. 2.0–6.0 V), and enhanced ESD ratings (HBM >2000 V vs. >200 V). No layout change is needed for drop-in replacement.

Does the 74AHC257PW,118 require external pull-up or pull-down resistors on unused inputs?

No. All inputs feature Schmitt-trigger action with defined thresholds and internal biasing. Unused inputs may be tied to V_CC or GND without risk of floating states or excessive current draw. However, tying to a valid logic level is still recommended to prevent unintended switching from noise.