Nexperia USA Inc. 74LVC257AD,118

Overview

74LVC257AD,118 from Nexperia is a quad 2-input 3-state multiplexer IC 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, featuring Schmitt-trigger inputs for noise immunity and IOFF partial power-down protection. It is used in digital logic routing, bus arbitration, and level-shifting applications in industrial control and embedded interface subsystems.

For engineers reviewing the 74LVC257AD,118 datasheet, 74LVC257AD,118 pinout, 74LVC257AD,118 application, or 74LVC257AD,118 equivalent, key selection criteria include 5 V tolerance on all I/O pins, guaranteed operation down to 1.2 V VCC, IOFF-enabled power-down isolation, propagation delay ≤6.4 ns at 3.3 V, and SO16 (SOT109-1) package compatibility with legacy PCB footprints.

Technical Context

This device implements four independent 2:1 multiplexers sharing a common select (S) and active-low output enable (OE) control. Each channel routes either of two inputs (nI0/nI1) to its corresponding 3-state output (nY), with outputs entering high-impedance state when OE is HIGH.

The IOFF circuit ensures bidirectional isolation during power-down by disabling outputs when VCC = 0 V, preventing backflow current even if input/output pins are driven at 5.5 V. Schmitt-trigger inputs provide hysteresis (typ. 0.3 V at 3.3 V), enabling robust operation with slow-rising signals from mechanical switches or legacy logic.

Key Specifications

Pinout & Package

74LVC257AD,118 uses the SO16 plastic small outline package (SOT109-1), 16-pin, 3.9 mm body width, with standard 1.27 mm lead pitch and gull-wing leads. Pin 1 marked by index notch; pin numbering follows 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 SN74LVC257APWR, the 74LVC257AD,118 offers legacy SO16 compatibility and simpler thermal management on standard FR-4; compared with 74LVC157AD,118, it provides native alignment with common active-LOW bus enable architectures, avoiding gate-level inversion.

Availability

74LVC257AD,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, digital audio switching matrices, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVC257AD,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 miniaturization in industrial, automotive, and consumer applications.

The 74LVC series targets low-voltage, mixed-signal interface applications requiring robust voltage translation, low static/dynamic power, and extended temperature operation - designed specifically for next-generation embedded controllers and sensor hubs.

FAQ

Can 74LVC257AD,118 operate with VCC = 1.2 V while driving 5 V-tolerant loads?

Yes. At VCC = 1.2 V, the device maintains full 5.5 V input/output tolerance and meets all static specifications including VIH/VIL thresholds scaled to 0.9 × VCC (min 1.08 V) and VOL ≤0.12 V at 100 μA. Propagation delay increases to 16 ns, but functionality remains intact for low-speed control routing.

What is the maximum capacitive load the outputs can drive while maintaining specified tpd?

The datasheet specifies timing with CL = 50 pF (for VCC ≥2.7 V). Output drive capability is rated for 50 Ω transmission lines at 85 °C, implying stable operation into ≤50 pF loads with ≤6.4 ns tpd. For heavier loads (>75 pF), tpd increases nonlinearly; design margin requires empirical validation at target frequency and temperature.

Does IOFF protection work when only one supply rail (e.g., VCC) is powered down?

Yes. IOFF activates whenever VCC = 0 V, regardless of input/output voltage levels. With VI or VO = 5.5 V and VCC = 0 V, IOFF limits backflow current to ±20 μA maximum, satisfying JEDEC JESD78 Class II latch-up immunity and preventing damage to upstream 5 V drivers.

Is the SO16 package (SOT109-1) RoHS-compliant and lead-free?

Yes. The 74LVC257AD,118 in SO16 packaging conforms to RoHS Directive 2011/65/EU and is fully lead-free, with matte tin (Sn) termination finish and halogen-free molding compound, verified per Nexperia's material declarations and IPC-J-STD-020 moisture sensitivity level 1 rating.