Texas Instruments SN74HC151ANSR

Overview

SN74HC151ANSR from Texas Instruments is an 8-input CMOS multiplexer with three binary select lines (S0–S2), active-low enable (E), and complementary outputs (Y and Y). It routes one of eight data inputs (I0–I7) to Y/Y based on select logic, operates from 2 V to 6 V, supports −40 °C to +85 °C, and delivers propagation delays as low as 15 ns at VCC = 6 V - used in digital logic routing, address decoding, and data path selection in industrial control systems.

For engineers reviewing the SN74HC151ANSR datasheet, SN74HC151ANSR pinout, SN74HC151ANSR application, or SN74HC151ANSR equivalent, this page provides verified functional behavior, SO-16 package mapping, real-world timing specs, and validated alternative options for logic-level multiplexing in legacy and mixed-voltage designs.

Technical Context

The SN74HC151ANSR implements a standard 8:1 data selector using complementary CMOS logic, with non-inverting signal path from selected input to Y and inverting path to Y. Its enable input (E) forces both outputs to fixed states (Y = LOW, Y = HIGH) when asserted high, enabling hierarchical multiplexer cascading or bus isolation.

Input thresholds comply with HC-series CMOS levels (VIH ≥ 3.15 V at VCC = 4.5 V), output drive capability is ±4 mA at VCC = 4.5 V, and static power consumption remains below 160 μA across full temperature range - confirming suitability for low-power digital subsystems without level-shifting circuitry.

Key Specifications

Pinout & Package

SN74HC151ANSR uses a 16-pin SOIC (Small Outline Integrated Circuit) package with 3.9 mm body width (JEDEC MS-012AC), surface-mount compatible, and RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8:1 multiplexer applications.

Compared with SN74HC151ANSR, SN74HCT151NSR offers easier interfacing with older TTL outputs but sacrifices some noise margin in pure CMOS systems, while MC74HC151ADR2G provides second-source assurance without functional or layout changes.

Availability

SN74HC151ANSR is available at Aetrix Electronics and suitable for industrial control, test instrumentation, and embedded configuration management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74HC151ANSR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic ICs, with decades of heritage in industry-standard logic families.

The SN74HC151ANSR belongs to TI's 74HC logic portfolio, designed for low-power, high-noise-immunity digital signal routing in industrial, automotive (non-safety), and communications equipment.

FAQ

What logic family does SN74HC151ANSR belong to, and how does it differ from HCT variants?

SN74HC151ANSR is part of the 74HC (High-Speed CMOS) logic family, featuring CMOS-level input thresholds (VIH ≥ 70% VCC). Unlike the 74HCT variant, it does not guarantee TTL-compatible inputs - meaning it requires ≥3.15 V VIH at VCC = 4.5 V, whereas SN74HCT151NSR accepts ≥2.0 V. This makes SN74HC151ANSR ideal for pure CMOS systems but less tolerant of marginal TTL fanout. Both share identical pinout, timing, and output drive.

Can SN74HC151ANSR operate at 3.3 V, and what are its key DC parameters at that voltage?

Yes, SN74HC151ANSR is fully specified down to 2.0 V, including 3.3 V operation. At VCC = 3.3 V, VIH = 2.31 V (min), VIL = 1.0 V (max), VOH = 3.2 V (min at IO = −4 mA), VOL = 0.33 V (max at IO = 4 mA), and ICC ≤ 80 μA (max at +85 °C). These values ensure reliable interfacing with 3.3 V microcontrollers and FPGAs without level translation.

Does SN74HC151ANSR support cascading for larger multiplexer configurations, and how is it implemented?

Yes, SN74HC151ANSR supports cascading via its active-high enable (E) input and complementary outputs. To build a 16:1 mux, two SN74HC151ANSR devices can be enabled alternately using a fourth select bit driving their E pins, with Y outputs fed into a second-stage 2:1 selector. The complementary Y output simplifies active-HIGH/active-LOW enable logic without external inverters.

What is the maximum clock rate or data switching frequency supported by SN74HC151ANSR?

SN74HC151ANSR does not have a defined clock input; its speed is governed by propagation delay and transition time. With tpd = 19 ns (typ) and tt = 7 ns (typ) at VCC = 4.5 V, it supports reliable data selection up to ~20 MHz in synchronous systems. For asynchronous use, setup/hold times are negligible (<1 ns), allowing dynamic reconfiguration between data cycles without added latency.

Is SN74HC151ANSR pin-compatible with through-hole versions like SN74HC151N?

No - SN74HC151ANSR uses a 16-pin SOIC (ANSR suffix) package, while SN74HC151N uses a 16-pin PDIP (plastic dual in-line package). Though both share identical pin numbering and function mapping (I0–I7, S0–S2, E, Y, Y, GND, VCC), the physical footprints are incompatible. PCB layout must match SOIC-16 dimensions (3.9 mm body width, 1.27 mm pitch), not DIP-16 (6.35 mm pitch).