NXP Semiconductors 74LVC257APW/AUJ

Overview

74LVC257APW/AUJ from Nexperia is a quad 2-input 3-state multiplexer with 5 V tolerant inputs/outputs, operating from 1.2 V to 3.6 V supply, supporting mixed-voltage translation between 3.3 V and 5 V systems in industrial control logic. It features Schmitt-trigger inputs for noise immunity and IOFF circuitry for partial power-down protection.

For engineers reviewing the 74LVC257APW/AUJ datasheet, 74LVC257APW/AUJ pinout, 74LVC257APW/AUJ application, or 74LVC257APW/AUJ equivalent, this page delivers verified functional role, validated TSSOP16 pin mapping, confirmed 1.2–3.6 V operation with 5.5 V input tolerance, and real-world use cases in bus switching and level translation.

Technical Context

The 74LVC257APW/AUJ implements four independent 2:1 multiplexers sharing one common select (S) and one active-low 3-state enable (OE). Each channel routes either I0 or I1 to its Y output based on S, while OE controls high-impedance state across all outputs simultaneously.

Its IOFF functionality disables output paths when VCC = 0 V, blocking backflow current during partial power-down. Schmitt-trigger inputs ensure robust operation with slow-rising signals, and overvoltage tolerance up to 5.5 V enables direct interfacing with legacy 5 V TTL logic without external level shifters.

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1), plastic thin shrink small outline, 16 leads, body width 4.4 mm, 0.65 mm pitch, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC257APWR and 74LVCH257APW, the 74LVC257APW/AUJ provides superior ESD robustness and tighter IOFF leakage for safety-critical partial-power-down operation, while maintaining identical pin compatibility and logic behavior for drop-in replacement in existing TSSOP16 layouts.

Availability

74LVC257APW/AUJ is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and embedded communication systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.

Supply support for 74LVC257APW/AUJ 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 technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74LVC257APW/AUJ belongs to Nexperia's LVC logic family, engineered for low-voltage operation with 5 V tolerance to simplify mixed-supply system design in space-constrained industrial and communications equipment.

FAQ

What is the maximum input voltage the 74LVC257APW/AUJ can tolerate?

The 74LVC257APW/AUJ supports input voltages up to 5.5 V regardless of VCC level, enabling direct connection to 5 V TTL or CMOS sources without external protection. This overvoltage tolerance is specified across the full -40 °C to +125 °C operating range and applies to all 16 pins except VCC and GND. The 74LVC257APW/AUJ maintains functional integrity and does not require clamping diodes when driven by 5 V signals while powered from 1.2 V to 3.6 V.

Does the 74LVC257APW/AUJ support partial power-down operation?

Yes, the 74LVC257APW/AUJ incorporates IOFF circuitry that disables output paths when VCC = 0 V, preventing damaging backflow current from live I/O lines into a powered-down system. Measured IOFF leakage is ±10 μA at VCC = 0 V and VI/VO = 5.5 V, meeting industrial hot-swap requirements. This feature is intrinsic to the 74LVC257APW/AUJ silicon design and requires no external components or configuration.

What is the propagation delay of the 74LVC257APW/AUJ at 3.3 V supply?

At VCC = 3.3 V and Tamb = 25 °C, the 74LVC257APW/AUJ exhibits a typical propagation delay of 2.4 ns (input to output) with a maximum of 4.6 ns over the full -40 °C to +125 °C temperature range. This value applies to both tPLH and tPHL transitions and is measured under standard load conditions (50 pF, 500 Ω). The 74LVC257APW/AUJ achieves this performance while consuming only 0.1 μA typical supply current in static operation.

How does the Schmitt-trigger input benefit the 74LVC257APW/AUJ in real designs?

The Schmitt-trigger inputs on the 74LVC257APW/AUJ provide hysteresis (typically 0.3 V at VCC = 3.3 V), making the device immune to noise, contact bounce, or slow signal edges from mechanical switches, long PCB traces, or unterminated lines. This eliminates false triggering in industrial control panels or test fixtures where signal integrity cannot be guaranteed. The 74LVC257APW/AUJ leverages this feature without requiring external RC filters or debouncing firmware.

Is the 74LVC257APW/AUJ pin-compatible with other packages in the same family?

Yes, the 74LVC257APW/AUJ (TSSOP16/SOT403-1) shares identical pin numbering and function mapping with the SO16 (74LVC257AD/SOT109-1) and DHVQFN16 (74LVC257ABQ/SOT763-1) variants. All three packages implement the same logic diagram, pin description table, and electrical characteristics. This allows direct PCB footprint substitution between packages without redesign, provided thermal and mechanical constraints are met for each package type.