NXP Semiconductors 74HCT4351N,112

Overview

74HCT4351N,112 from Nexperia is an 8-channel analog multiplexer/demultiplexer with latch, designed for bidirectional signal routing in mixed-signal systems. It features three select inputs (S0–S2), dual enable inputs (E1 active LOW, E2 active HIGH), latch enable (LE active LOW), eight independent I/Os (Y0–Y7), and one common I/O (Z). With ±5 V analog input range, 70 Ω typical ON-resistance at 5 V supply, and logic-level translation capability, it enables 5 V digital control of ±5 V analog signals in data acquisition and instrumentation circuits.

For engineers reviewing the 74HCT4351N,112 datasheet, 74HCT4351N,112 pinout, 74HCT4351N,112 application, or 74HCT4351N,112 equivalent, key selection considerations include its rail-to-rail analog voltage swing (VEE to VCC), latch-controlled channel selection, break-before-make switching behavior, guaranteed operation over −40 °C to +125 °C, and compatibility with standard 5 V TTL logic levels.

Technical Context

The 74HCT4351N,112 implements a high-speed Si-gate CMOS analog switch matrix with integrated address latching. Its digital control section (S0–S2, LE, E1, E2) operates from 4.5 V to 5.5 V, while analog paths (Y0–Y7, Z) support VEE = −5 V and VCC = +5 V - enabling true bipolar signal handling. The latch function allows asynchronous capture of channel addresses, decoupling control timing from analog signal integrity requirements.

Each of the eight bidirectional analog switches exhibits matched ON-resistance (ΔRON ≤ 6 Ω max between channels), low switch capacitance (5 pF per Yn, 25 pF on Z), and <−50 dB OFF-state feed-through at 1 MHz. The device complies with JEDEC Standard No. 7A and supports minimum frequency response up to 170 MHz (−3 dB) under 50 Ω/10 pF conditions.

Key Specifications

Pinout & Package

74HCT4351N,112 is supplied in a 20-pin plastic DIP (dual in-line package) with 2.54 mm pitch, compliant with JEDEC MS-001. Pin 10 is GND; pin 20 is VCC; pin 9 is VEE (negative supply); pins 3 and 14 are not connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT4351N,112, the 74HC4351N,112 offers broader supply flexibility but reduced TTL noise immunity, while the CD74HCT4051E trades latch capability and differential routing for compactness and lower cost in non-critical timing applications.

Availability

74HCT4351N,112 is available at Aetrix Electronics and suitable for industrial data acquisition, automotive sensor interfaces, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT4351N,112 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 leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP's Standard Products division in 2017 and focused on automotive, industrial, computing, and consumer markets.

The 74HCT4351N,112 belongs to Nexperia's 74HCT logic family, engineered for robust 5 V TTL-compatible analog switching in harsh environments - emphasizing latch stability, bipolar signal integrity, and extended temperature performance.

FAQ

What is the maximum allowable VCC–VEE voltage difference for the 74HCT4351N,112?

The 74HCT4351N,112 specifies a maximum VCC–VEE difference of 10.0 V. At the rated ±5 V configuration (VCC = +5 V, VEE = −5 V), this limit is met exactly. Exceeding 10 V risks permanent damage to the internal analog switches and violates Absolute Maximum Ratings per the datasheet. Derating is not permitted - operation must remain within this bound under all conditions including transients.

Does the 74HCT4351N,112 support true bidirectional analog signal flow?

Yes, the 74HCT4351N,112 supports fully bidirectional analog signal flow on all Y0–Y7 and Z terminals. Each switch conducts equally well in either direction, with symmetrical ON-resistance and capacitance. This enables flexible use cases such as routing sensor outputs to an ADC (Yn → Z) or feeding DAC outputs to multiple loads (Z → Yn), provided voltage limits (VEE ≤ VS ≤ VCC) are observed at all terminals.

Can the 74HCT4351N,112 operate with VEE tied to GND?

Yes, the 74HCT4351N,112 can operate with VEE = GND for digital multiplexing applications. In this mode, it functions as a unipolar 0–5 V analog switch with identical logic control and latch behavior. However, ON-resistance increases slightly (vs. ±5 V operation), and the device loses bipolar signal capability - making it suitable only for single-supply systems where negative voltages are absent.

What is the purpose of the two enable inputs (E1 and E2) on the 74HCT4351N,112?

E1 (active LOW) and E2 (active HIGH) provide complementary enable logic to support flexible system-level control architectures. Both must be asserted simultaneously (E1 = LOW, E2 = HIGH) for any channel to conduct. This dual-enable scheme allows hierarchical gating - for example, E2 may be held HIGH by a subsystem controller while E1 is toggled by a local sequencer - enhancing fault containment and reducing unintended channel activation.

How does the latch enable (LE) function affect timing in the 74HCT4351N,112?

The LE input controls whether the S0–S2 address lines are transparent or latched. When LE is HIGH, channel selection follows S0–S2 in real time; when LE goes LOW, the current address is captured and held regardless of subsequent S0–S2 changes. This eliminates setup/hold timing constraints between address updates and analog sampling windows - a critical advantage in synchronous data acquisition systems using the 74HCT4351N,112.