Nexperia USA Inc. 74AHC257D,112

Overview

74AHC257D,112 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 multiplexing, signal selection, and level translation between 3.3 V and 5 V logic domains.

For engineers reviewing the 74AHC257D,112 datasheet, 74AHC257D,112 pinout, 74AHC257D,112 application, or 74AHC257D,112 equivalent, key selection criteria include propagation delay (≤7.5 ns at VCC = 5.5 V, CL = 50 pF), 3-state enable timing (ten ≤12.5 ns), input voltage compatibility (CMOS-level), and SO16 package thermal performance (Ptot = 500 mW at Tamb ≤110 °C).

Technical Context

The device implements four independent 2:1 multiplexers sharing a common select (S) and output-enable (OE) control. Each channel routes either I0 or I1 to its Y output based on S, with outputs entering high-impedance state when OE is HIGH. The Schmitt-trigger inputs ensure robust switching in noisy environments.

Its overvoltage tolerance allows direct interfacing with 5 V signals while powered from 3.3 V supplies - enabling seamless translation without external level shifters. All static and dynamic parameters are fully specified across -40 °C to +125 °C, supporting industrial and extended-temperature applications.

Key Specifications

Pinout & Package

74AHC257D,112 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT257D,112, the AHC variant offers superior noise immunity and wider supply flexibility but requires CMOS-level drivers; versus SN74LVC257APWR, it trades speed for robustness in mixed-voltage environments and maintains SO16 compatibility for legacy footprint reuse.

Availability

74AHC257D,112 is available at Aetrix Electronics and suitable for industrial automation, test equipment design, and embedded system interface development requiring stable component supply across extended temperature ranges and mixed-voltage operation.

Supply support for 74AHC257D,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, reliable logic, discrete, and MOSFET solutions optimized for efficiency-critical applications.

The 74AHC series targets high-speed, low-power digital interface functions in industrial, computing, and communications systems - emphasizing robustness, wide supply range, and interoperability across voltage domains.

FAQ

Can 74AHC257D,112 operate with VCC = 2.5 V while accepting 5 V inputs?

Yes. Its overvoltage-tolerant inputs allow VI up to 5.5 V independent of VCC, enabling safe operation at 2.5 V supply while interfacing with 5 V sensors or controllers. No external clamping is needed, and all DC specifications (VIH/VIL, VOH/VOL) remain valid per Table 5 and Table 6.

What is the maximum clock frequency supported for reliable data switching?

While not a clocked device, the 74AHC257D,112 supports data rates up to ~100 MHz in practice: with tpd ≤7.5 ns and ten/tdis ≤12.5 ns, it meets setup/hold timing for 10 ns period signals when used with proper PCB layout (controlled impedance, minimized stubs, and local decoupling).

Is the SO16 package RoHS-compliant and lead-free?

Yes. The SOT109-1 package used for 74AHC257D,112 is RoHS-compliant and lead-free per Nexperia's product compliance documentation (document ID: "74AHC_AHCT257" Rev. 4, March 2024), with JEDEC-standard Pb-free terminations and halogen-free molding compound.

How does the Schmitt-trigger input improve noise immunity compared to standard CMOS inputs?

Schmitt-trigger inputs provide hysteresis (~0.5 V typical), meaning the threshold for rising-edge detection (VIH) is significantly higher than for falling-edge detection (VIL). This prevents multiple toggles from slow-rising or noisy signals - critical in long-trace industrial wiring or unshielded sensor interfaces where EMI-induced glitches exceed 100 mV.