Texas Instruments SN74LVC157ANS

Overview

SN74LVC157ANS from NXP Semiconductors is a quad 2-input multiplexer IC that routes four parallel data bits from two input sources (I0/I1) to four true outputs (Y1–Y4) under control of a common select (S) and active-low enable (E). It operates from 1.65 V to 3.6 V, supports 5 V-tolerant inputs, and delivers propagation delays as low as 1.0 ns at 3.0–3.6 V - enabling use in bus selection, register-to-bus data routing, and logic function generation in industrial control and mixed-voltage digital systems.

For engineers reviewing the SN74LVC157ANS datasheet, SN74LVC157ANS pinout, SN74LVC157ANS application, or SN74LVC157ANS equivalent, key selection considerations include its 16-pin SOIC (SO16) package, −40 °C to +125 °C temperature rating, 5 V input tolerance for 3.3 V/5 V level translation, and guaranteed output skew ≤1.5 ns - critical for timing-critical data path consolidation and synchronous logic synthesis.

Technical Context

The SN74LVC157ANS implements a 4-pole, 2-position switch function using CMOS logic, with all four multiplexer channels sharing one select (S) and one enable (E) control line. Its truth table defines deterministic output behavior: when E = HIGH, all outputs force LOW; when E = LOW, outputs reflect selected inputs (nY = nI_S). No internal latching or clocking is present - operation is purely combinational.

Input voltage thresholds scale with V_CC: VIH = 0.65×V_CC (1.65–1.95 V), 1.7 V (2.3–2.7 V), or 2.0 V (2.7–3.6 V); VIL = 0.35×V_CC, 0.7 V, or 0.8 V respectively. Output drive strength is specified up to 24 mA sink/source at 3.0 V, with VOL ≤ 0.55 V and VOH ≥ V_CC − 0.2 V under defined loads.

Key Specifications

Pinout & Package

SN74LVC157ANS is supplied in a 16-lead plastic small outline package (SO16, SOT109-1) with 3.9 mm body width, 1.27 mm lead pitch, and gull-wing leads. Pin 1 index is marked by a notch or bevel on the package 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 SN74LVC157ANS, the 74LVC157AD offers identical functionality and performance in the same SO16 package, while SN74LVCH162374APAG provides registered latching and wider bus support at the cost of added timing complexity and non-combinational behavior - making it unsuitable for direct substitution.

Availability

SN74LVC157ANS is available at Aetrix Electronics and suitable for industrial bus selection, mixed-voltage level translation, digital logic function generation, and register-to-bus data routing requiring stable component supply across extended temperature ranges.

Supply support for SN74LVC157ANS 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The SN74LVC157ANS belongs to NXP's LVC logic family, designed for low-voltage, high-speed, mixed-signal interfacing in space-constrained and thermally demanding embedded systems.

FAQ

What is the maximum supply voltage for SN74LVC157ANS?

The absolute maximum supply voltage for SN74LVC157ANS is +6.5 V, but the recommended operating range is 1.65 V to 3.6 V. Operation above 3.6 V may cause excessive current draw or reliability degradation. For long-term stability and compliance with JEDEC standards, maintain V_CC within the 1.65–3.6 V window during normal operation. The SN74LVC157ANS is not rated for continuous operation at 5 V on V_CC.

Does SN74LVC157ANS support 5 V logic inputs while powered at 3.3 V?

Yes, SN74LVC157ANS features 5 V tolerant inputs, allowing it to accept 0–5.5 V logic signals even when V_CC is as low as 1.65 V. This capability is explicitly verified in the datasheet's Recommended Operating Conditions (Table 5) and Static Characteristics (Table 6), where VIH and VIL thresholds are defined up to 5.5 V input. The SN74LVC157ANS thus serves reliably as a level translator in mixed-voltage systems without external components.

What is the function of the E (enable) pin on SN74LVC157ANS?

The E pin on SN74LVC157ANS is an active-low enable input. When E is HIGH, all four outputs (1Y–4Y) are forced LOW regardless of S, I0, or I1 states - effectively disabling the multiplexer. When E is LOW, the device operates normally, routing selected inputs to outputs based on S. This feature allows global gating of data paths, such as blanking outputs during system reset or power-up sequencing. The SN74LVC157ANS uses E to provide fail-safe output control independent of the select line.

Can SN74LVC157ANS be used as a logic function generator?

Yes, SN74LVC157ANS can generate any of 16 possible two-variable Boolean functions (e.g., AND, OR, XOR, NAND) across its four outputs by fixing one input variable (e.g., S or E) and applying the other two variables to I0 and I1. Its combinational architecture and shared select logic make it suitable for implementing irregular logic patterns in glue logic or CPLD-lite applications. The SN74LVC157ANS achieves this without clocks or memory, delivering deterministic, low-latency function synthesis.

What package type is used for SN74LVC157ANS?

SN74LVC157ANS is packaged in a 16-lead plastic small outline package (SO16, SOT109-1) with 3.9 mm body width, 1.27 mm lead pitch, and gull-wing leads. This surface-mount package is RoHS-compliant, reflow-solderable, and compatible with standard SOIC footprints. The SN74LVC157ANS does not use SSOP, TSSOP, or QFN variants - only the SO16 configuration carries the "NS" suffix per NXP's ordering information.