Texas Instruments SN74HC151PW

Overview

SN74HC151PW from Texas Instruments is a 8-line to 1-line data selector/multiplexer in TSSOP-16 package, operating from 2 V to 6 V, with typical propagation delay of 13 ns at 5 V, ±6-mA output drive, and low 80-μA max ICC. It performs Boolean-function generation and parallel-to-serial conversion in digital logic control subsystems.

For engineers reviewing the SN74HC151PW datasheet, SN74HC151PW pinout, SN74HC151PW application, or SN74HC151PW equivalent, this page delivers verified electrical specs, functional mode mapping, real-world use cases, and validated alternative options for industrial control, test equipment, and embedded logic design.

Technical Context

The SN74HC151PW 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), with strobe (G) enabling active-low operation. Its CMOS architecture ensures rail-to-rail logic compatibility and low static current.

Functional behavior is defined by a deterministic truth table: when G = L, Y mirrors the selected Dn input and W provides its complement; when G = H, Y = L and W = H regardless of select or data states. All inputs tolerate slow transitions per TI SCBA004 guidance.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm body, 1.2 mm max height), lead pitch 0.65 mm, RoHS-compliant NiPdAu/Sn finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC151PW, SN74LV151APWR offers faster switching in 3.3-V domains but sacrifices 5-V tolerance, while CD74HC151M96 provides identical functionality in a more manufacturable SOIC package-both require no logic redesign but differ in physical integration and voltage margin trade-offs.

Availability

SN74HC151PW is available at Aetrix Electronics and suitable for industrial control logic, test equipment signal routing, embedded system bus expansion, and digital logic prototyping requiring stable component supply and long-term sourcing continuity.

Supply support for SN74HC151PW 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 solutions, with over 50 years of innovation in high-reliability digital ICs.

The SN74HC151PW belongs to TI's 74HC logic family, designed for robust, low-power, pin-compatible replacements of legacy TTL in industrial, automotive, and communications infrastructure applications.

FAQ

What is the maximum clock frequency supported by SN74HC151PW?

The SN74HC151PW is a combinational logic device with no internal clock; its usable data rate depends on propagation delay and system timing margins. With typical tpd = 13 ns at 5 V, it supports reliable operation in digital paths where setup/hold times allow ≥30-MHz toggle rates on select and data lines. Always verify timing against worst-case tpd (62 ns at 6 V, CL = 150 pF) in critical paths.

Can SN74HC151PW operate at 3.3 V?

Yes, SN74HC151PW operates across 2 V to 6 V, including 3.3 V nominal supply. At VCC = 3.3 V, VIH = 2.31 V min and VIL = 0.99 V max ensure compatibility with standard 3.3-V CMOS logic families. Propagation delay increases to ~18 ns typical, and output drive reduces to ±4.5 mA, remaining sufficient for LVTTL or 74LVC interface loads.

What happens to outputs Y and W when the strobe input G is high?

When G is high, SN74HC151PW forces Y low and W high regardless of A, B, C, or D0–D7 states. This hardwired disable state isolates downstream logic and provides predictable default output behavior during reset, power-up, or bus arbitration-no floating outputs or metastability risk.

Is SN74HC151PW pin-compatible with other 74HC151 variants?

Yes, SN74HC151PW shares identical pinout with all 16-pin packages (SOIC-D, PDIP-N, SOP-NS, TSSOP-PW) per TI SCLS110F datasheet. Pin numbers 1–16 map identically across these variants, enabling drop-in replacement where board layout accommodates TSSOP thermal and soldering requirements.

Does SN74HC151PW require external pull-up or pull-down resistors on unused inputs?

Yes, all unused inputs-including A, B, C, D0–D7, and G-must be tied to VCC or GND per TI SCBA004. Floating CMOS inputs cause increased ICC, noise susceptibility, and potential oscillation. For example, tie unneeded D inputs to GND if inactive low, or to VCC if default high is required in function table.