Nexperia USA Inc. 74HC251D,653

Overview

74HC251D,653 from Nexperia is an 8-input CMOS multiplexer with complementary outputs (Y and Y̅), three binary select lines (S0–S2), and active-low 3-state output enable (OE). It operates from 2.0 V to 6.0 V, delivers propagation delays as low as 14 ns at VCC = 6.0 V, and supports industrial temperature range (−40 °C to +125 °C) in SO16 package. It routes one of eight data inputs to dual outputs for digital signal routing in microcontroller I/O expansion and address decoding.

For engineers reviewing the 74HC251D,653 datasheet, 74HC251D,653 pinout, 74HC251D,653 application, or 74HC251D,653 equivalent, key selection criteria include supply voltage compatibility (2.0–6.0 V), 3-state output control timing (enable/disable < 36 ns), input logic level type (CMOS), thermal derating behavior (12.4 mW/K above 110 °C), and SO16 mechanical footprint alignment with JEDEC MS-012.

Technical Context

The 74HC251D,653 implements a non-inverting 8:1 data selector using standard CMOS logic gates, with independent high-impedance control via OE. Its functional truth table defines deterministic output selection based on S2:S0 binary code and enables/disables both Y and Y̅ simultaneously.

Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Static characteristics guarantee VIH ≥ 3.15 V and VIL ≤ 1.35 V at VCC = 4.5 V, while dynamic performance includes tpd = 14–51 ns depending on supply and load conditions.

Key Specifications

Pinout & Package

74HC251D,653 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width, compliant with JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC251D,653, the 74HCT251D,653 eases integration into mixed-logic systems with TTL sources, while SN74HC251N trades surface-mount efficiency for mechanical flexibility-neither offers improved speed or lower power, making the original optimal for new high-density designs.

Availability

74HC251D,653 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC251D,653 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 logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HC251D,653 belongs to Nexperia's high-speed CMOS logic family, engineered for robust signal integrity, low static power, and seamless interoperability in mixed-voltage digital systems.

FAQ

What is the maximum clock frequency supported by the 74HC251D,653?

The 74HC251D,653 does not operate on a clock; it is a combinational multiplexer. Its usable switching rate depends on propagation delay and load capacitance. With CL = 50 pF and VCC = 6.0 V, tpd = 14 ns limits practical toggle rates to ≤ 35 MHz for reliable data routing, assuming sufficient setup/hold margins on select inputs.

Can the 74HC251D,653 drive a 50 pF capacitive load directly?

Yes. The datasheet specifies dynamic characteristics (tpd, tt) explicitly at CL = 50 pF. Output drive capability is rated for IO = ±25 mA, and typical transition time is 6–19 ns under this load. For sustained operation, ensure PCB trace impedance and decoupling meet layout guidelines to avoid ringing or overshoot.

Is the 74HC251D,653 pin-compatible with the 74LS251?

No. While both are 8-input multiplexers, the 74LS251 uses different pin assignments: its Y and Y̅ outputs are on pins 5 and 6 (same as 74HC251D), but its OE is on pin 13 (vs. pin 7), and select inputs occupy pins 10–12 (vs. 9–11). Direct replacement requires PCB redesign or adapter circuitry.

Does the 74HC251D,653 support hot insertion?

No. The device lacks explicit hot-swap protection features such as power-on reset, slew-rate controlled I/O, or back-drive immunity. Applying VCC while signals are present may violate absolute maximum ratings (e.g., VI > VCC + 0.5 V), risking latch-up or ESD damage. Power sequencing must follow VCC-before-signals protocol.