Texas Instruments SN74HC151PWT

Overview

SN74HC151PWT 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, delivering 13 ns typical propagation delay at 5 V, ±6 mA output drive, and 80 μA max ICC. It performs binary decoding to route one of eight digital inputs (D0–D7) to the non-inverted output (Y) or inverted output (W), with active-low strobe (G) enabling selection - used in digital logic routing, Boolean function generation, and parallel-to-serial conversion.

For engineers reviewing the SN74HC151PWT datasheet, SN74HC151PWT pinout, SN74HC151PWT application, or SN74HC151PWT equivalent, this page provides verified functional mode definitions, confirmed switching characteristics at 50 pF load, validated TSSOP-16 mechanical dimensions, and real-world design implications of its dual-output (Y/W), strobe-controlled enable architecture.

Technical Context

The SN74HC151PWT implements full binary decoding across three select inputs (A, B, C) to choose among eight data sources, with the strobe (G) input forcing Y = LOW and W = HIGH when HIGH - making it a true enable-gated multiplexer. Its CMOS architecture ensures rail-to-rail logic swing, low static current (≤1 μA), and compatibility with LSTTL loads.

Switching behavior is characterized under CL = 50 pF: tpd from select inputs (A/B/C) to Y/W is 25 ns (typ) at VCC = 6 V, while propagation from any D input to Y/W is 20 ns (typ) at same condition; G-to-output tpd is 13 ns (typ). Input transition time limits (400 ns max at VCC = 6 V) ensure reliable timing margin in synchronous systems.

Key Specifications

Pinout & Package

TSSOP-16 package (PW), body size 5.00 mm × 4.40 mm, 1.2 mm max height, 0.65 mm lead pitch, 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 SN74HC151PWT, SN74HCT151PWR adds TTL input threshold compatibility at no cost to pinout or timing, while 74LVC151APW,118 trades 5 V operation for sub-2 V capability and faster 3.3 V switching - making SN74HC151PWT the optimal balance of voltage flexibility, drive strength, and industrial temperature support.

Availability

SN74HC151PWT is available at Aetrix Electronics and suitable for industrial control logic, microcontroller peripheral expansion, digital test equipment, and legacy system interfacing requiring stable component supply and long-term lifecycle assurance.

Supply support for SN74HC151PWT 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 electronic components.

The SN74HC151PWT belongs to TI's 74HC high-speed CMOS logic family, designed for low-power, wide-supply digital signal routing in industrial, automotive, and communications systems where noise immunity and predictable timing are critical.

FAQ

What is the function of the strobe (G) pin on the SN74HC151PWT?

The strobe (G) pin on the SN74HC151PWT is an active-low enable input. When G is LOW, the device decodes inputs A, B, C to route the selected D0–D7 signal to outputs Y and W. When G is HIGH, Y is forced LOW and W is forced HIGH regardless of select or data inputs - enabling hardware-level data gating and bus arbitration in the SN74HC151PWT.

Does the SN74HC151PWT support 3.3 V operation?

Yes, the SN74HC151PWT fully supports 3.3 V operation within its specified 2 V to 6 V supply range. At VCC = 3.3 V, it delivers ≥4.9 mA output drive, <1 μA input leakage, and typical tpd of 30 ns (A/B/C to Y/W) with CL = 50 pF - making it suitable for mixed-voltage systems interfacing with 3.3 V microcontrollers while maintaining compatibility with 5 V peripherals.

Can the SN74HC151PWT replace a 74LS151 in an existing design?

The SN74HC151PWT can replace a 74LS151 in most cases, but requires verification of input voltage thresholds and loading. Unlike 74LS151, the SN74HC151PWT has CMOS inputs (VIH ≈ 0.7×VCC), so 5 V TTL outputs will interface reliably, but 3.3 V microcontroller outputs may need pull-up resistors at VCC = 5 V. Its lower ICC and higher noise margin improve reliability, but layout must accommodate TSSOP-16 footprint instead of PDIP.

What is the maximum capacitive load the SN74HC151PWT can drive reliably?

The SN74HC151PWT is characterized for CL = 50 pF and CL = 150 pF loads in its datasheet. At CL = 150 pF and VCC = 6 V, tpd increases to 59 ns (max) from A/B/C to Y/W. For reliable timing closure beyond 150 pF, external buffer amplification is recommended - the SN74HC151PWT itself does not specify derating beyond 150 pF, and excessive load capacitance degrades edge rate and increases ground bounce.

Is the SN74HC151PWT pin-compatible with other TSSOP-16 multiplexers like the SN74HC251PWR?

No, the SN74HC151PWT is not pin-compatible with SN74HC251PWR. While both are TSSOP-16 8:1 multiplexers, SN74HC251PWR features complementary enable (active-HIGH E) and different pin assignments: E occupies pin 1 (not G), and outputs Y/W are on pins 5 and 6 (vs. pins 14 and 13 on SN74HC151PWT). Direct replacement requires PCB redesign - the SN74HC151PWT uses dedicated G, A, B, C, D0–D7, Y, W, VCC, GND layout per TI's SCLS110F pin diagram.