Texas Instruments SN74HC151PWR

Overview

SN74HC151PWR from Texas Instruments is an 8-line to 1-line CMOS data selector/multiplexer in a 16-pin TSSOP package, operating from 2 V to 6 V supply, with typical propagation delay of 43 ns at 6 V, ±6-mA output drive capability, and low 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 active-low strobe G, used in digital logic routing, Boolean function generation, and parallel-to-serial conversion.

For engineers reviewing the SN74HC151PWR datasheet, SN74HC151PWR pinout, SN74HC151PWR application, or SN74HC151PWR equivalent, this page delivers verified functional behavior, validated timing specs at 2/4.5/6 V, confirmed TSSOP-16 mechanical dimensions, and real-world substitution guidance for logic multiplexing tasks in industrial control, test equipment, and embedded interface design.

Technical Context

The SN74HC151PWR implements full binary decoding logic to route one of eight input signals to the non-inverted output Y and inverted output W. Its strobe (G) input enables or disables all data paths: G = LOW enables selection; G = HIGH forces Y = LOW and W = HIGH regardless of address inputs.

It operates across the full HC family voltage range (2–6 V), supports standard CMOS input thresholds, and delivers rail-to-rail output swing with ±6-mA drive strength at 5 V. Switching performance is characterized at CL = 50 pF and CL = 150 pF, with propagation delays specified per input-to-output path (e.g., address-to-Y, data-to-Y, G-to-Y).

Key Specifications

Pinout & Package

TSSOP-16 package (PW), 5.00 mm × 4.40 mm nominal body size, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NiPdAu/Sn lead finish, MSL Level-1 (260 °C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC251PWR and 74LVX151MTR, the SN74HC151PWR provides the broadest supply voltage range and widest temperature rating, making it the preferred choice for general-purpose, mixed-voltage, and industrial-grade multiplexing where tri-state control or ultra-low propagation delay are not mandatory.

Availability

SN74HC151PWR is available at Aetrix Electronics and suitable for industrial PLC I/O multiplexing, digital test equipment signal routing, embedded configuration register access, and legacy bus interface logic translation requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.

Supply support for SN74HC151PWR 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 high-reliability components for industrial, automotive, and communications markets.

The SN74HC151PWR belongs to TI's 74HC high-speed CMOS logic family, designed for low-power, wide-voltage-range digital signal routing in industrial control, instrumentation, and legacy system upgrades where compatibility, stability, and ease of integration are critical.

FAQ

What is the maximum clock or data rate supported by SN74HC151PWR?

The SN74HC151PWR is a combinational logic device-not a clocked sequential circuit-so it does not have a "clock rate." Its usable data switching frequency depends on propagation delay and system timing margins. With a typical tpd of 43 ns at 6 V (CL = 50 pF), it supports reliable data selection up to approximately 10 MHz in well-designed synchronous systems. For higher-frequency routing, verify setup/hold times relative to the controlling address and strobe edges in your specific layout.

Can SN74HC151PWR operate at 3.3 V and interface directly with 5 V logic?

Yes, SN74HC151PWR operates reliably from 2 V to 6 V, including 3.3 V. Its outputs swing rail-to-rail and meet 5 V TTL input thresholds (VOH ≥ 2.4 V, VOL ≤ 0.4 V at VCC = 3.3 V), enabling direct connection to 5 V LSTTL or 74HCT inputs. However, driving SN74HC151PWR inputs from 5 V logic requires current-limiting resistors or level-shifting, as absolute max input voltage is VCC + 0.5 V.

What happens to outputs Y and W when the strobe (G) input is left unconnected?

An unconnected G input floats near mid-supply due to CMOS input impedance, causing undefined output states and potential high ICC. Per TI's SCBA004 guidance, all unused inputs-including G-must be tied to VCC or GND. For SN74HC151PWR, connect G to GND to enable normal multiplexing, or to VCC to force Y = LOW and W = HIGH as a static disable state.

Is SN74HC151PWR pin-compatible with SN74HC151N (PDIP) and SN74HC151DR (SOIC)?

Yes, SN74HC151PWR shares identical pin numbering, signal assignment, and logic function with SN74HC151N (16-pin PDIP) and SN74HC151DR (16-pin SOIC). The only differences are package dimensions and thermal characteristics. This allows direct footprint substitution during prototyping or redesign-provided PCB layout accommodates the smaller TSSOP-16 outline (5.00 mm × 4.40 mm vs. 19.31 mm × 6.35 mm for PDIP).

Does SN74HC151PWR require external pull-up or pull-down resistors on address inputs A, B, C?

No-SN74HC151PWR has no internal pull resistors, but external biasing is only needed if address lines float during operation. In most microcontroller-driven applications, A/B/C are actively driven GPIOs and require no resistors. If generated by open-collector sources or subject to noise, add 10-kΩ pull-downs (for active-HIGH addressing) or pull-ups (for active-LOW), ensuring VIH/VIL thresholds are met per the 5.2 Recommended Operating Conditions table in the SN74HC151PWR datasheet.