Texas Instruments SN74HC151DRG4

Overview

SN74HC151DRG4 from Texas Instruments is an 8-line to 1-line CMOS data selector/multiplexer in SOIC-16 package, operating from 2 V to 6 V, 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 SN74HC151DRG4 datasheet, SN74HC151DRG4 pinout, SN74HC151DRG4 application, or SN74HC151DRG4 equivalent, this page provides verified functional modes, switching characteristics at 50 pF/150 pF loads, absolute maximum ratings, thermal metrics for SOIC-D, and confirmed pin mapping per TI SCLS110F Rev F.

Technical Context

The SN74HC151DRG4 implements full binary decoding using three select lines (A, B, C) to choose among eight data inputs (D0–D7). Its dual outputs - Y (true) and W (inverted) - are simultaneously valid only when strobe (G) is low; G high forces Y = L and W = H regardless of selects or data.

It operates within −40°C to +85°C ambient temperature, supports 50 pF and 150 pF capacitive loads, and exhibits input transition time limits of 400 ns (VCC = 6 V), 500 ns (4.5 V), and 1000 ns (2 V). All unused inputs must be tied to VCC or GND to prevent floating states and undefined logic behavior.

Key Specifications

Pinout & Package

SN74HC151DRG4 uses a 16-pin SOIC (D) package with nominal body size 9.90 mm × 3.90 mm and 1.27 mm lead pitch. Pin 1 is located at the top-left corner with notch or index mark orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC251DR and 74LVX151M, SN74HC151DRG4 offers broader voltage flexibility (2–6 V), proven industrial temperature support, and simpler enable architecture - making it optimal for general-purpose logic routing where three-state control or ultra-low-voltage operation is unnecessary.

Availability

SN74HC151DRG4 is available at Aetrix Electronics and suitable for industrial control logic, digital test equipment, programmable logic interfaces, and legacy system bus expansion requiring stable component supply and long-term manufacturability.

Supply support for SN74HC151DRG4 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 ICs, with over 50 years of innovation in high-reliability digital logic families.

The SN74HC151DRG4 belongs to TI's 74HC high-speed CMOS logic series, designed for low-power, wide-supply-voltage digital interfacing and combinational logic implementation in industrial, instrumentation, and computing systems.

FAQ

What is the function of the strobe (G) pin on the SN74HC151DRG4?

The strobe (G) pin on the SN74HC151DRG4 is an active-low enable input. When G is low, the device decodes A/B/C inputs to pass the selected D0–D7 signal to Y and W outputs. When G is high, Y is forced low and W is forced high regardless of select or data inputs - enabling cascading, gating, or priority override in logic designs. This behavior is explicitly defined in the function table of TI's SCLS110F datasheet.

Can SN74HC151DRG4 operate reliably at 3.3 V supply voltage?

Yes, SN74HC151DRG4 operates reliably at 3.3 V supply voltage. Its recommended operating range is 2 V to 6 V, and electrical characteristics including VIH (≥2.31 V), VIL (≤1.09 V), and tpd (≤22 ns) are fully specified at VCC = 3.3 V per TI SCLS110F Rev F. The device maintains ±4 mA output drive and <1 μA input leakage at this voltage, making it suitable for mixed-signal 3.3 V systems.

Does SN74HC151DRG4 require external pull-up or pull-down resistors on its inputs?

No, SN74HC151DRG4 does not require external pull-up or pull-down resistors on its inputs when actively driven, but all unused inputs must be intentionally tied to VCC or GND to prevent floating states. TI's datasheet mandates this in Section 5.2 to avoid undefined logic behavior, increased ICC, or oscillation - especially critical for A, B, C, G, and any unconnected Dx lines in partial-use configurations.

What is the maximum capacitive load SN74HC151DRG4 can drive while maintaining specified timing?

SN74HC151DRG4 is characterized for CL = 50 pF and CL = 150 pF loads per TI SCLS110F Rev F. At VCC = 5 V and TA = 25°C, tpd remains within specification (max 62 ns) up to 150 pF. Driving loads beyond 150 pF increases propagation delay nonlinearly and may violate setup/hold margins in synchronous systems - external buffering is recommended for >200 pF traces or fan-out >10 LSTTL.

Is SN74HC151DRG4 pin-compatible with other 74HC-series 8-to-1 multiplexers?

Yes, SN74HC151DRG4 is pin-compatible with SN74HC251DR and SN74HC151N in the same SOIC-16 (D) or PDIP-16 (N) packages. All share identical pin assignments for VCC, GND, A/B/C, D0–D7, Y, W, and G. However, SN74HC251DR adds an OE pin (pin 15) and relocates VCC to pin 16, so direct substitution requires board-level verification - SN74HC151DRG4 matches the base SN74HC151 pinout exactly.