NXP Semiconductors 74HC4051D/AUJ

Overview

74HC4051D/AUJ from Nexperia is an 8-channel analog multiplexer/demultiplexer (SP8T) with CMOS logic compatibility, ±5 V analog signal handling capability, 80 Ω typical ON resistance at 4.5 V supply, active-low enable input (E), and operation across -40 °C to +125 °C. It routes analog or digital signals in data acquisition systems requiring channel selection via three binary address lines (S0–S2).

For engineers reviewing the 74HC4051D/AUJ datasheet, 74HC4051D/AUJ pinout, 74HC4051D/AUJ application, or 74HC4051D/AUJ equivalent, this device supports bidirectional analog switching, logic-level translation between 5 V digital control and ±5 V analog domains, and low-noise signal routing in mixed-signal embedded designs.

Technical Context

The 74HC4051D/AUJ implements a single-pole octal-throw analog switch architecture with integrated 1-of-8 decoder driving eight independent Yn terminals and one common Z terminal. Its enable (E) input disables all channels when HIGH, while clamp diodes on all inputs allow safe interfacing to voltages beyond VCC using current-limiting resistors.

It operates with dual supplies (VCC and VEE), supporting rail-to-rail analog voltage ranges from -5 V to +5 V relative to GND. The device exhibits typical 'break-before-make' switching behavior and complies with JEDEC standards JESD8C (2.7–3.6 V) and JESD7A (2.0–6.0 V).

Key Specifications

Pinout & Package

74HC4051D/AUJ is supplied in SO16 (SOT109-1) package: plastic small outline, 16-pin, 3.9 mm body width, surface-mount.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Compared with 74HC4051D/AUJ, 74HCT4051D offers identical analog routing capability with TTL-input compatibility, while ADG708BRUZ delivers superior analog fidelity and integration but requires redesign of address/control logic and cannot replace 74HC4051D/AUJ without layout or firmware changes.

Availability

74HC4051D/AUJ is available at Aetrix Electronics and suitable for industrial automation, automotive diagnostics, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC4051D/AUJ 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

The 74HC4051D/AUJ belongs to Nexperia's HC logic family, engineered for low-power, high-noise-immunity analog signal routing in mixed-signal systems operating across wide voltage and temperature ranges.

FAQ

What is the maximum analog signal voltage range supported by the 74HC4051D/AUJ?

The 74HC4051D/AUJ supports analog signal voltages from -5 V to +5 V relative to GND when operated with dual supplies (VCC = +5 V, VEE = -5 V). With single-supply configuration (VEE = GND), the valid analog range is 0 V to VCC, where VCC may be set from 2.0 V to 10.0 V per datasheet specifications.

Does the 74HC4051D/AUJ require external pull-up or pull-down resistors on its select lines (S0–S2)?

No, the 74HC4051D/AUJ does not require external pull-up or pull-down resistors on S0–S2 because its CMOS inputs have negligible leakage current (±0.1 μA typical at 25 °C) and defined VIH/VIL thresholds. However, floating select lines must be avoided in practice - stable logic levels should be driven directly from a microcontroller or latch to prevent undefined channel selection.

Can the 74HC4051D/AUJ be used with a single 3.3 V supply for interfacing with modern MCU GPIOs?

Yes, the 74HC4051D/AUJ operates with VCC = 3.3 V and VEE = GND, supporting analog signals from 0 V to 3.3 V. Its VIH threshold is 2.1 V (min) at VCC = 3.3 V, fully compatible with 3.3 V CMOS logic outputs. For bidirectional analog signals exceeding 3.3 V, dual-supply operation (e.g., VCC = 5 V, VEE = -5 V) is required.

How does the enable (E) pin function in the 74HC4051D/AUJ, and what happens to signal integrity when E is HIGH?

The E pin is active LOW: when E = HIGH, all internal analog switches are fully OFF, resulting in isolation >50 dB between Z and all Yn terminals at 1 MHz. OFF-state leakage remains below ±0.4 μA (typical), ensuring minimal signal bleed-through and preserving signal integrity during channel deselection or power-save modes.

Is the 74HC4051D/AUJ pin-compatible with other packages like TSSOP16 or DHVQFN16 variants of the same part number?

Yes, the 74HC4051D/AUJ (SO16/SOT109-1) shares identical pin numbering and electrical functionality with 74HC4051PW (TSSOP16), 74HC4051BQ (DHVQFN16), and 74HC4051BZ (DHXQFN16). All variants implement the same 16-pin assignment per Table 2 of the datasheet, enabling direct PCB footprint substitution where thermal and mechanical constraints permit.