Nexperia USA Inc. 74HC251D,652

Overview

74HC251D,652 from Nexperia is an 8-input CMOS multiplexer with complementary outputs (Y and Y), 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 delay 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,652 datasheet, 74HC251D,652 pinout, 74HC251D,652 application, or 74HC251D,652 equivalent, key selection criteria include input voltage compatibility (CMOS-level), 3-state output control timing (enable/disable times ≤ 42 ns), propagation delay across supply voltages, thermal derating behavior in SO16, and functional equivalence with 74HCT251 variants in TTL-system interfacing.

Technical Context

The 74HC251D,652 implements a standard 8:1 multiplexer logic function using CMOS transistor technology, with non-inverting data path and complementary outputs. Its select inputs (S0–S2) decode binary addresses to route exactly one of eight inputs (I0–I7) to Y, while Y provides inverted output - enabling direct connection to differential receivers or logic inversion without external gates.

Output enable (OE) controls high-impedance tri-state operation on both Y and Y simultaneously, allowing bus sharing in multi-device systems. Input clamp diodes support interface to overvoltage sources when used with current-limiting resistors, and ESD protection meets HBM >2000 V and CDM >1000 V per JEDEC JS-001/JS-002.

Key Specifications

Pinout & Package

74HC251D,652 is housed in a plastic small outline package (SO16), SOT109-1, with 16 leads and 3.9 mm body width. Pin 1 is index-marked; device uses standard SOIC footprint compatible with IPC-7351B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT251D,653, the 74HC251D,652 provides superior noise immunity and wider supply flexibility; versus SN74LS251N, it reduces power by >90% and improves speed by 44%, but requires attention to input threshold compatibility in TTL-dominated systems.

Availability

74HC251D,652 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller address decoding, digital test equipment signal routing, and legacy system bus interface requiring stable component supply across extended temperature ranges.

Supply support for 74HC251D,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 semiconductor expert delivering high-performance, reliable logic, analog, and MOSFET solutions with focus on efficiency, reliability, and sustainability.

The 74HC251D,652 belongs to Nexperia's HC-series high-speed CMOS logic family, designed specifically for low-power, wide-supply digital signal routing in industrial automation, test instrumentation, and embedded control systems.

FAQ

What is the maximum clock frequency supported by the 74HC251D,652?

The 74HC251D,652 does not operate on a clock; it is a combinational logic device. Its usable data rate depends on propagation delay and system timing margins. With 14 ns typical tpd at VCC = 6.0 V and CL = 50 pF, it supports reliable switching up to approximately 35 MHz in well-designed PCB layouts with controlled trace impedance and proper decoupling.

Can the 74HC251D,652 drive a 50 Ω transmission line directly?

No. The 74HC251D,652 has ±4.0 mA output drive at VCC = 4.5 V, insufficient to properly terminate a 50 Ω line (requiring ~10 mA for 5 V swing). It must interface through a dedicated line driver or series termination resistor (e.g., 33 Ω in series with 50 Ω load) to prevent reflections and overshoot in high-speed routing.

Is the 74HC251D,652 pin-compatible with the 74HC251PW variant?

No. While both implement identical logic, the 74HC251D,652 uses SO16 (SOT109-1) package with 1.27 mm lead pitch, whereas 74HC251PW uses TSSOP16 (SOT403-1) with 0.65 mm pitch. Footprints, solder reflow profiles, and mechanical clearances differ - they are not interchangeable without PCB redesign.

Does the 74HC251D,652 support hot insertion or live swapping?

No. The device lacks powered-off protection circuitry. Inserting or removing it while VCC or inputs are energized risks latch-up or ESD damage due to uncontrolled voltage sequencing. Always power down the system before replacing the IC, and observe ESD handling protocols during assembly.