NXP Semiconductors 74HC4351N,652

Overview

74HC4351N,652 from Nexperia is an 8-channel analog multiplexer/demultiplexer with latch, designed for bidirectional signal routing in mixed-signal systems. It features ±5 V analog input range, 80 Ω typical ON-resistance at 4.5 V supply, and dual enable inputs (E1 active LOW, E2 active HIGH) for flexible channel control. It supports logic-level translation between 5 V digital control and ±5 V analog signals in data acquisition front-ends.

For engineers reviewing the 74HC4351N,652 datasheet, 74HC4351N,652 pinout, 74HC4351N,652 application, or 74HC4351N,652 equivalent, key selection criteria include guaranteed turn-ON time ≤35 ns (HCT), latch-enable timing (tW ≥25 ns), rail-to-rail analog swing (VEE to VCC), break-before-make switching behavior, and compatibility with HC/HCT logic families across −40 °C to +125 °C.

Technical Context

The 74HC4351N,652 implements a high-speed Si-gate CMOS analog switch matrix with address latching via LE (active LOW). Its three select lines (S0–S2) determine one of eight Yn–Z paths, while E1/E2 jointly gate conduction - only when E1 = LOW and E2 = HIGH does any channel conduct.

It operates with independent supply domains: digital control (VCC/GND, 2.0–10.0 V for HC) and analog path (Y0–Y7/Z spanning VEE to VCC, where |VCC−VEE| ≤10.0 V). The device exhibits built-in break-before-make timing and supports both analog and digital multiplexing modes depending on VEE connection (GND for digital, negative rail for bipolar analog).

Key Specifications

Pinout & Package

DIP-20 plastic package (JEDEC MS-001), 20-pin dual in-line through-hole mounting. Pin 10 = GND, Pin 20 = VCC, Pin 9 = VEE, Pin 11 = LE (latch enable, active LOW), Pins 12/13/15 = S0/S1/S2, Pins 1/2/5/6/16/17/18/19 = Y0–Y7, Pin 4 = Z (common I/O), Pins 7/8 = E1/E2, Pins 3/14 = n.c.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC4351N,652, the 74HCT4351N,652 offers improved noise immunity with TTL thresholds but identical analog performance, while the CD74HC4351E delivers identical functionality in a smaller footprint at the cost of mechanical robustness and hand-soldering feasibility.

Availability

74HC4351N,652 is available at Aetrix Electronics and suitable for industrial data acquisition, automotive sensor interfaces, and test equipment requiring stable component supply with long-term lifecycle support.

Supply support for 74HC4351N,652 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 high-performance discrete, logic, and power MOSFET semiconductors, spun off from NXP's Standard Products division in 2017 and focused on automotive, industrial, and computing markets.

The 74HC4351N,652 belongs to Nexperia's 74HC/HCT logic family, engineered for robust analog signal routing in mixed-signal systems where reliability, wide supply tolerance, and precise timing control are essential.

FAQ

What is the maximum allowable VCC−VEE voltage for the 74HC4351N,652?

The absolute maximum VCC−VEE voltage for the 74HC4351N,652 is 10.0 V, as specified in the Ratings table. Exceeding this limit risks permanent damage to the internal analog switches. For reliable operation, the recommended operating condition specifies VCC−VEE up to 10.0 V, with typical use cases at ±4.5 V (9.0 V total) or ±5.0 V (10.0 V total) - always ensure VEE remains ≤ VCC and both stay within their respective absolute max ratings relative to GND.

Can the 74HC4351N,652 operate with VEE tied to GND?

Yes, the 74HC4351N,652 can operate with VEE tied to GND, effectively configuring it as a unipolar 0 V to VCC analog switch - commonly used for digital multiplexing. In this mode, the analog inputs/outputs (Y0–Y7 and Z) swing from 0 V to VCC, matching standard CMOS logic levels. All timing, ON-resistance, and leakage specifications remain valid, though the device loses bipolar signal capability.

Does the 74HC4351N,652 support simultaneous switching of multiple channels?

No, the 74HC4351N,652 selects exactly one channel (Y0–Y7) to connect to Z at any time, as defined by the S0–S2 address and enabled by E1/E2 states. It does not support parallel or simultaneous conduction of multiple Yn paths. Attempting to assert conflicting addresses or violating the enable conditions results in all switches being OFF - the architecture enforces strict single-channel selection per cycle.

What is the purpose of the "n.c." pins (3 and 14) on the 74HC4351N,652?

Pins 3 and 14 of the 74HC4351N,652 are designated "not connected" (n.c.) - they have no internal bond wire or circuit connection and must remain unconnected in the PCB layout. These pins exist for mechanical symmetry and package compatibility within the DIP-20 footprint family and serve no electrical function. Soldering or routing to them may cause mechanical stress or unintended parasitic coupling.

How does the latch enable (LE) input affect timing in the 74HC4351N,652?

The LE input controls whether the S0–S2 address lines are transparent or latched: when LE is HIGH, Yn–Z routing follows real-time S0–S2 changes; when LE goes LOW, the current address is captured and held regardless of subsequent S0–S2 transitions. This enables glitch-free channel selection during bus arbitration or slow microcontroller updates - the 74HC4351N,652 requires a minimum 25 ns LE HIGH pulse width to guarantee reliable latching at VCC = 4.5 V.