Texas Instruments SN74HC151N

Overview

SN74HC151N from Texas Instruments is an 8-line to 1-line CMOS data selector/multiplexer in a 16-pin PDIP 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 Boolean-function generation and parallel-to-serial conversion in digital logic systems.

For engineers reviewing the SN74HC151N datasheet, SN74HC151N pinout, SN74HC151N application, or SN74HC151N equivalent, this page delivers verified functional modes, validated timing characteristics, confirmed package dimensions (19.31 mm × 6.35 mm), and real-world multiplexer use cases for embedded control and signal routing design.

Technical Context

The SN74HC151N implements full binary decoding across three select inputs (A, B, C) to route one of eight data inputs (D0–D7) to the standard (Y) and inverted (W) outputs. Strobe (G) enables selection only when low; high G forces Y = L and W = H - a hardwired enable/disable control path.

Its CMOS architecture ensures rail-to-rail input compatibility, low static current (≤1 μA), and TTL-compatible output drive (up to 10 LSTTL loads). Switching performance is specified at CL = 50 pF, with tpd = 25 ns (min) / 62 ns (max) at 6 V and 25°C.

Key Specifications

Pinout & Package

SN74HC151N uses a 16-pin Plastic Dual In-line Package (PDIP) with nominal body size 19.31 mm × 6.35 mm and 2.54-mm lead pitch. Pin 1 is located at the left end of the top row, identified by a notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LS151N, SN74HC151N enables lower-power, wider-voltage operation but requires careful handling of unused inputs; compared with CD74HC151E, it offers identical functionality with Texas Instruments-specific quality and traceability documentation.

Availability

SN74HC151N is available at Aetrix Electronics and suitable for industrial control logic, microcontroller peripheral expansion, digital function generation, and legacy system interface adapter applications requiring stable component supply and long-term production continuity.

Supply support for SN74HC151N 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 90 years of innovation in industrial, automotive, and consumer electronics.

The SN74HC151N belongs to TI's 74HC high-speed CMOS logic family, designed for low-power, wide-supply-voltage digital signal routing and combinational logic implementation in cost-sensitive and thermally constrained applications.

FAQ

What is the function of the strobe (G) input on the SN74HC151N?

The strobe (G) input on the SN74HC151N is an active-low enable control. When G is high, both outputs are forced to fixed states: Y = low and W = high, regardless of select or data inputs. Only when G is low does the device perform normal 8-to-1 multiplexing. This allows precise timing control and hierarchical cascading in larger logic systems.

Can SN74HC151N operate reliably at 3.3 V supply voltage?

Yes, SN74HC151N operates reliably at 3.3 V. Its specified supply range is 2 V to 6 V, and all recommended operating conditions-including VIH (≥2.31 V), VOL (≤0.1 V), and tpd (≤49 ns)-are guaranteed across this range. At 3.3 V, it delivers full logic compatibility with 3.3 V microcontrollers and FPGAs without level-shifting circuitry.

Does SN74HC151N require external pull-up or pull-down resistors on its select inputs?

No, SN74HC151N does not require external pull-up or pull-down resistors on A, B, or C inputs - provided they are actively driven. However, TI mandates that all unused inputs be tied to VCC or GND to prevent floating states. Leaving select lines unconnected risks undefined output behavior and increased ICC due to input stage oscillation.

How does the dual-output (Y and W) capability of SN74HC151N benefit circuit design?

The dual-output (Y and W) capability of SN74HC151N provides both true and complemented versions of the selected data simultaneously. This eliminates the need for external inverters in applications like parity generation, multiplexer-based ALUs, or differential signaling interfaces - reducing component count, propagation delay, and board area while improving timing predictability.

Is SN74HC151N RoHS compliant and lead-free?

Yes, SN74HC151N is RoHS compliant and features lead-free (Pb-free) terminations with NiPdAu or matte tin (NIPDAU) plating, as confirmed in TI's official packaging addendum. The part marking "SN74HC151N" appears on the package body, and its PDIP package meets JEDEC standards for lead-free reflow compatibility.