Nexperia USA Inc. 74HC251DB-Q100J

Overview

74HC251DB-Q100 from Nexperia is an automotive-grade 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, supports -40 °C to +125 °C ambient range, and delivers propagation delay as low as 14 ns at VCC = 6.0 V - used in vehicle body control modules for signal routing between sensor banks and microcontroller ADC inputs.

For engineers reviewing the 74HC251DB-Q100 datasheet, 74HC251DB-Q100 pinout, 74HC251DB-Q100 application, or 74HC251DB-Q100 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, dual complementary outputs, input clamping diodes enabling overvoltage-tolerant interfacing, and SO16-compatible SSOP16 package footprint.

Technical Context

This device implements a single-pole, eight-throw analog/digital signal selector using standard HC logic thresholds. Its non-inverting data path ensures logic-level fidelity across all eight inputs, while OE-controlled high-impedance outputs allow bus sharing in multi-device systems without external isolation.

The internal architecture includes input clamp diodes for ±20 mA transient current handling, latch-up immunity exceeding 100 mA per JESD78 Class II Level B, and ESD protection rated at >2000 V HBM and >1000 V CDM - critical for under-hood automotive environments subject to load dump and electrostatic discharge events.

Key Specifications

Pinout & Package

74HC251DB-Q100 uses SOT338-1 (SSOP16), a 16-pin shrink small outline package with 0.65 mm lead pitch and 4.4 mm body width - pin-compatible with SO16 and TSSOP16 footprints but offering higher density mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC251D-Q100, the DB variant offers 30 % smaller area and finer pitch for high-density automotive PCBs; versus 74HCT251PW-Q100, it provides superior noise margin in 3.3 V domains but requires level translation for pure TTL interfaces.

Availability

74HC251DB-Q100 is available at Aetrix Electronics and suitable for automotive body control, instrument cluster, ADAS calibration, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC251DB-Q100 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 logic, analog, and MOSFET solutions optimized for automotive, industrial, and consumer applications with emphasis on reliability and energy efficiency.

The 74HC251-Q100 series belongs to Nexperia's automotive-qualified logic portfolio, engineered specifically for signal routing in harsh-environment electronic control units where AEC-Q100 compliance and thermal robustness are mandatory.

FAQ

What is the maximum clock frequency supported by 74HC251DB-Q100?

The device does not operate on a clock; it is combinational logic. Maximum data switching rate is governed by propagation delay and transition time: at VCC = 6.0 V and CL = 50 pF, tpd = 14–43 ns and tt = 6–19 ns, supporting reliable operation up to ~20 MHz for repetitive input changes with clean edges.

Can 74HC251DB-Q100 interface directly with 3.3 V microcontrollers?

Yes. With VCC = 3.3 V, VIH = 2.31 V (min) and VIL = 1.09 V (max) per datasheet Table 6, providing 0.99 V noise margin for 3.3 V logic. Outputs swing rail-to-rail, ensuring compatible VOH/VOL levels for downstream 3.3 V receivers.

Does 74HC251DB-Q100 support hot insertion or live swapping?

No. The device lacks hot-swap protection circuitry. Applying VCC before GND or connecting inputs while unpowered may forward-bias internal clamp diodes, risking latch-up or parametric shift. Power sequencing per JEDEC JESD8-12 must be observed.

How does the complementary output (Y) improve system reliability?

Y provides inverted logic of Y, enabling real-time parity checking or XOR-based fault detection. In safety-critical applications like EPS, comparing Y and Y with an external XOR gate detects stuck-at faults or output driver failures within one propagation delay cycle.