Nexperia USA Inc. 74AHC257D,118

Overview

74AHC257D,118 from Nexperia is a quad 2-input CMOS multiplexer with 3-state outputs, overvoltage-tolerant inputs (up to 5.5 V), non-inverting data path, and Schmitt-trigger inputs. It operates across 2.0 V–5.5 V supply range and supports mixed-voltage translation in digital logic interfaces such as bus arbitration and signal routing in industrial control systems.

For engineers reviewing the 74AHC257D,118 datasheet, 74AHC257D,118 pinout, 74AHC257D,118 application, or 74AHC257D,118 equivalent, key selection criteria include its 3-state output enable timing (tdis ≤ 9.5 ns at VCC = 5.5 V), input overvoltage tolerance, rail-to-rail CMOS logic compatibility, and SO16 package thermal performance up to +125 °C ambient.

Technical Context

This 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. The Schmitt-trigger inputs provide noise immunity for slow or noisy control signals.

Its overvoltage-tolerant inputs allow interfacing between 3.3 V logic domains and 5 V buses without level shifters. The 3-state outputs support bidirectional bus architectures, and propagation delays are balanced across channels (tpd ≤ 7.5 ns at VCC = 5.5 V, CL = 15 pF).

Key Specifications

Pinout & Package

74AHC257D,118 is supplied in SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, gull-wing leads, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHC257D,118, the 74AHCT257D,118 offers guaranteed TTL input compatibility at 5 V but sacrifices 3.3 V system flexibility, while SN74LVC257APW reduces supply headroom and overvoltage safety to achieve lower static power and smaller footprint-making each alternative optimal only within distinct voltage and legacy interface constraints.

Availability

74AHC257D,118 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and embedded bus management requiring stable component supply across extended temperature ranges and mixed-voltage environments.

Supply support for 74AHC257D,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 logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume applications.

The 74AHC257D,118 belongs to Nexperia's advanced high-speed CMOS logic family, engineered for robust mixed-signal interfacing in industrial, computing, and communications infrastructure where voltage translation and timing precision are critical.

FAQ

Can 74AHC257D,118 operate reliably at 2.0 V supply?

Yes. The device is fully specified down to 2.0 V supply, with guaranteed VIH/VIL thresholds, propagation delays (tpd ≤ 12.0 ns at CL = 15 pF), and output drive (VOH ≥ 1.5 V at IO = −50 μA) across the full −40 °C to +125 °C range. This enables use in ultra-low-power battery-backed systems.

What is the maximum capacitive load supported on each output?

Each output drives up to 50 pF load capacitance while maintaining specified timing (tpd ≤ 7.5 ns at VCC = 5.5 V) and voltage levels (VOH ≥ 3.70 V, VOL ≤ 0.55 V). Exceeding 50 pF increases propagation delay nonlinearly and may degrade noise margins due to increased rise/fall times.

Does 74AHC257D,118 require external pull-up or pull-down resistors on unused inputs?

No. All inputs feature Schmitt-trigger action with defined VIH/VIL thresholds and <0.1 μA leakage current. Floating inputs are electrically unstable and must be tied to VCC or GND; however, no external resistors are needed for noise immunity-the internal hysteresis provides sufficient rejection.

How does overvoltage tolerance function when VCC = 3.3 V?

Inputs tolerate up to 5.5 V regardless of VCC value. When VCC = 3.3 V, internal protection circuitry clamps input currents below 20 mA (per IEC 60134), allowing safe connection to 5 V buses. No external components are required, and logic thresholds remain referenced to the actual VCC level.