Nexperia USA Inc. 74HCT157BQ-Q100,11

Overview

74HCT157BQ-Q100 from Nexperia is an automotive-qualified quad 2-input multiplexer IC with TTL-compatible inputs, 16-terminal DHVQFN package, -40 °C to +125 °C operating range, and active-low enable (E) controlling four independent non-inverting data paths. It selects between two input sources per channel (1I0/1I1 → 1Y, etc.) and is used in vehicle body control modules for signal routing between sensor banks and microcontroller ADCs.

For engineers reviewing the 74HCT157BQ-Q100 datasheet, 74HCT157BQ-Q100 pinout, 74HCT157BQ-Q100 application, or 74HCT157BQ-Q100 equivalent, key selection considerations include TTL-level input compatibility, AEC-Q100 Grade 1 qualification, propagation delay under 41 ns at 4.5 V, DHVQFN thermal performance, and enable-controlled output disable behavior.

Technical Context

This device implements four independent 2:1 multiplexers sharing a common select (S) and active-low enable (E) control line. Each channel routes either I0 or I1 to its Y output based on S state, while E=HIGH forces all outputs LOW regardless of S or inputs.

It operates across 4.5 V to 5.5 V supply, supports CMOS-level output drive (±4 mA), features input clamp diodes enabling overvoltage-tolerant interfacing, and meets JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V) standards - with TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) ensuring compatibility with legacy 5 V logic families.

Key Specifications

Pinout & Package

DHVQFN16 package (SOT763-1): 2.5 × 3.5 × 0.85 mm body, side-wettable flanks for AOI, no leads, 16 copper terminals. Thermal pad (terminal 1 index area) is electrically isolated unless connected to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input multiplexer applications.

Compared with 74HC157BQ-Q100, this part offers TTL input compatibility critical for legacy automotive systems, while SN74LV4052AQPWRQ1 trades digital precision for analog flexibility - making 74HCT157BQ-Q100 optimal for deterministic, low-skew digital signal routing in safety-critical control domains.

Availability

74HCT157BQ-Q100 is available at Aetrix Electronics and suitable for automotive body control modules, instrument cluster electronics, engine management systems, and ADAS subsystems requiring stable component supply with AEC-Q100 compliance and extended temperature support.

Supply support for 74HCT157BQ-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 focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions optimized for automotive, industrial, and consumer applications.

The 74HCT157-Q100 series belongs to Nexperia's automotive-qualified logic portfolio, designed specifically for robust signal routing in harsh-temperature, high-reliability vehicle subsystems where pin-compatible upgrade paths and long-term supply stability are mandatory.

FAQ

Is the thermal pad (terminal 1 index area) electrically connected to GND?

No. The thermal pad in the DHVQFN16 package (SOT763-1) is not electrically connected to any internal node. Per the datasheet, it has no electrical or mechanical requirement to be soldered. If soldered, it must remain floating or be explicitly connected to GND - never left as a floating metal island that could cause parasitic coupling or thermal stress.

Can 74HCT157BQ-Q100 operate at 3.3 V supply?

No. The 74HCT157BQ-Q100 is specified only for 4.5 V to 5.5 V operation per Table 5. At 3.3 V, VIH and VIL thresholds become undefined, output drive degrades below specification, and timing parameters (e.g., tpd) are not guaranteed. For 3.3 V systems, use the 74LVC157 or 74AUP1G157 families instead.

What happens to outputs when E is HIGH and S toggles?

When E is HIGH, all four outputs (1Y–4Y) are forced LOW regardless of S state or input values. S transitions have no effect on outputs during enable disable - the device does not enter high-impedance; it actively drives LOW. This behavior is confirmed in Table 3 (Function table) and Section 6.

Does this part support hot insertion or live swapping?

No. The 74HCT157BQ-Q100 lacks hot-swap protection features such as power-up reset, Ioff partial power-down, or bus-hold. Applying VCC before GND, or inserting while powered, risks latch-up or ESD damage due to uncontrolled voltage sequencing. Always follow proper power-rail ramping and static-safe handling procedures.