Texas Instruments SN74HC151NSR

Overview

SN74HC151NSR from Texas Instruments is an 8-line to 1-line CMOS data selector/multiplexer in a 16-pin SOP (NS) package, operating from 2 V to 6 V, with typical propagation delay of 13 ns at 5 V, ±6-mA output drive, and 80-μA max ICC. It performs binary decoding to select one of eight data inputs (D0–D7) under control of address lines A/B/C and strobe (G), used in digital logic systems for Boolean function generation and parallel-to-serial conversion.

For engineers reviewing the SN74HC151NSR datasheet, SN74HC151NSR pinout, SN74HC151NSR application, or SN74HC151NSR equivalent, this page delivers verified electrical specs, functional modes, package dimensions, real-world use cases, and validated alternative parts - all grounded in TI's SCLS110F production datasheet and orderable packaging data.

Technical Context

The SN74HC151NSR implements full binary decoding across three select inputs (A, B, C) to route one of eight data inputs (D0–D7) to the non-inverted output (Y) and inverted output (W). The strobe (G) input enables or disables the multiplexer: G = LOW enables selection; G = HIGH forces Y = LOW and W = HIGH regardless of select or data states.

It operates within standard HC logic voltage thresholds (VIH = 3.15 V min at VCC = 4.5 V; VIL = 1.35 V max), supports 50-pF load switching, and features low input current (≤1 μA) and high noise immunity due to CMOS input structure. All unused inputs must be tied to VCC or GND to prevent floating-induced malfunction.

Key Specifications

Pinout & Package

SOP (NS) package, 16-pin, body size 6.20 mm × 5.30 mm, 2.00 mm max height, 1.27 mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1 (260 °C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC251DR, SN74HC151NSR lacks tristate but simplifies design with fixed push-pull outputs; compared with CD74HC151M96, it uses SOP-NS packaging for 30% smaller board area while maintaining identical logic behavior and industrial temperature rating.

Availability

SN74HC151NSR is available at Aetrix Electronics and suitable for industrial control logic, digital test equipment, legacy system interface, and embedded serial conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74HC151NSR 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 delivering analog, embedded processing, and logic solutions with over 50 years of process and reliability expertise.

The SN74HC151NSR belongs to TI's 74HC logic family, designed for high-speed, low-power, pin-compatible upgrades to legacy TTL in industrial, automotive, and communications systems.

FAQ

What is the maximum clock frequency supported by SN74HC151NSR?

The SN74HC151NSR does not operate on a clock signal-it is asynchronous. Its usable data rate is governed by propagation delay: at VCC = 5 V and CL = 50 pF, tpd = 13 ns typical, supporting reliable switching up to ~30 MHz in well-designed layouts. Maximum toggle rate depends on input transition times and load capacitance, not internal clocking.

Does SN74HC151NSR require external pull-up or pull-down resistors on its inputs?

No-SN74HC151NSR has CMOS inputs with negligible leakage (≤1 μA), so inputs must be actively driven to valid logic levels. Floating inputs are prohibited and will cause unpredictable output behavior. Unused inputs must be tied to VCC or GND; external resistors are unnecessary unless implementing wired-OR or specific biasing in mixed-signal interfaces.

Can SN74HC151NSR operate at 3.3 V supply voltage?

Yes. SN74HC151NSR is fully specified from 2 V to 6 V, including 3.3 V. At VCC = 3.3 V, VIH = 2.31 V min and VIL = 0.99 V max per datasheet Section 5.2, ensuring compatibility with standard 3.3-V CMOS and microcontroller I/Os without level translation.

What is the meaning of the 'NS' in SN74HC151NSR?

The 'NS' denotes the SOP (Small Outline Package) variant with 16 pins and 1.27-mm lead pitch. Per TI's packaging nomenclature and the Package Option Addendum, SN74HC151NSR uses the NS package (body size 6.20 mm × 5.30 mm), distinct from SOIC (D), PDIP (N), or TSSOP (PW) variants.

How does the strobe (G) input affect SN74HC151NSR output behavior?

When G = HIGH, SN74HC151NSR forces Y = LOW and W = HIGH regardless of A/B/C or D0–D7 states-effectively disabling data routing. When G = LOW, normal multiplexing occurs: Y outputs the selected D-input (D0–D7) and W outputs its inverse. This enables synchronous gating of data streams in state-machine designs.