Nexperia USA Inc. 74AHC157BQ,115

Overview

74AHC157BQ,115 from Nexperia is a quad 2-input CMOS multiplexer with active-low enable (E), common select input (S), and four independent 2:1 data paths (1Y–4Y). It operates from 2.0 V to 5.5 V, delivers propagation delays as low as 3.2 ns (VCC = 5 V, CL = 15 pF), supports -40 °C to +125 °C operation, and implements logic equations such as 1Y = E × (1I1 × S + 1I0 × S̅) for digital signal routing in bus arbitration and register selection.

For engineers reviewing the 74AHC157BQ,115 datasheet, 74AHC157BQ,115 pinout, 74AHC157BQ,115 application, or 74AHC157BQ,115 equivalent, key selection criteria include its CMOS-level input compatibility, DHVQFN16 thermal-enhanced package, guaranteed 125 °C operation, and use as a function generator for two-variable logic synthesis.

Technical Context

The 74AHC157BQ implements four independent 2:1 multiplexers sharing one select (S) and one active-low enable (E) control line. Each output (1Y–4Y) follows Yn = E̅ × (In1 × S + In0 × S̅), enabling simultaneous 4-bit data routing from dual sources under single-bit control.

It features Schmitt-trigger inputs for noise immunity, accepts input voltages up to 7.0 V regardless of VCC, and maintains balanced propagation delays across all channels - critical for synchronous bus switching and timing-critical logic reconstruction.

Key Specifications

Pinout & Package

DHVQFN16 (SOT763-1) package: 2.5 mm × 3.5 mm × 0.85 mm body, 16-terminal no-lead thermal-enhanced quad flat design with exposed thermal pad (non-soldered by default); optimized for high-density PCB layouts and improved thermal performance over SO16/TSSOP variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT157BQ,115, the 74AHC157BQ,115 offers superior noise immunity and 5 V-tolerant inputs but requires stricter VIH compliance. Versus SN74LVC157APWR, it trades lower static power for broader voltage and temperature coverage - critical for industrial control and automotive under-hood modules.

Availability

74AHC157BQ,115 is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive body control modules, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHC157BQ,115 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 specializing in high-performance, energy-efficient logic, analog, and discrete components - delivering scalable solutions for automotive, industrial, and consumer electronics.

The 74AHC157BQ belongs to Nexperia's AHC logic family, engineered for high-speed, low-power CMOS operation with robust noise immunity and wide supply voltage tolerance - targeting board-level signal routing and digital subsystem integration.

FAQ

What is the maximum clock frequency supported by the 74AHC157BQ,115?

The 74AHC157BQ,115 does not operate as a clocked device but as a combinational multiplexer. Its usable data rate depends on propagation delay and load capacitance: with CL = 15 pF and VCC = 5 V, tpd = 3.2 ns (typ), supporting clean signal switching up to ~150 MHz for repetitive S toggling. System-level timing must account for worst-case 8.0 ns max delay and output rise/fall times.

Can the 74AHC157BQ,115 be used with a 3.3 V supply and 5 V inputs?

Yes. The 74AHC157BQ,115 accepts input voltages up to 7.0 V independent of VCC, making it safe for 5 V-tolerant operation at VCC = 3.3 V. VIH is guaranteed ≥ 3.85 V at VCC = 5.5 V, and input clamping current remains within ±20 mA limits per JEDEC JS-001, eliminating need for external resistors in mixed-voltage interconnects.

Is the thermal pad (Pin 7) required to be soldered to ground?

No. Pin 7 is a non-electrical thermal pad per SOT763-1 specification. Nexperia states there is "no electrical or mechanical requirement to solder the pad." If soldered, it must remain floating or connect to GND - never to VCC or signal nets. Thermal performance improves with GND connection, but functional operation is unaffected if left unsoldered.

How does the enable (E) pin behave during power-up sequencing?

The E pin is active LOW and has no internal pull-up. During power-up, if E floats HIGH, all outputs (1Y–4Y) are forced LOW - a fail-safe state preventing undefined bus contention. For deterministic startup, tie E to GND via a 10 kΩ resistor or synchronize it with system reset to ensure controlled activation after VCC stabilizes above 2.0 V.