Nexperia USA Inc. 74AHCT164D,118

Overview

74AHCT164D,118 from Nexperia is an 8-bit serial-in/parallel-out shift register with TTL-compatible inputs, dual serial data inputs (DSA and DSB), eight buffered parallel outputs (Q0–Q7), master reset (MR) active LOW, and edge-triggered clock (CP) on LOW-to-HIGH transitions. It operates from 4.5 V to 5.5 V and is rated for -40 °C to +125 °C, enabling use in industrial control logic and LED matrix drivers.

For engineers reviewing the 74AHCT164D,118 datasheet, 74AHCT164D,118 pinout, 74AHCT164D,118 application, or 74AHCT164D,118 equivalent, key selection factors include its TTL-level input compatibility, 5.5 V overvoltage-tolerant inputs, 11.5 ns max propagation delay at 5 V/50 pF, SO14 package footprint, and MR-synchronized asynchronous clear function.

Technical Context

This device implements a synchronous 8-stage shift register using positive-edge-triggered D-type flip-flops. Data enters serially via either DSA or DSB-each serving as an active-HIGH enable for the other-and shifts into Q0 on each CP rising edge. The MR input asynchronously forces all outputs LOW independent of CP or data state.

Input Schmitt-trigger action provides high noise immunity, while overvoltage tolerance up to 5.5 V allows interoperability across mixed-voltage domains. Its CMOS construction ensures low static power consumption (<80 μA at 5.5 V), and dynamic performance is characterized by 85 MHz max frequency at 5 V/50 pF load.

Key Specifications

Pinout & Package

74AHCT164D,118 is supplied in a 14-lead SOIC (SO14) package per SOT108-1, with 3.9 mm body width, gull-wing leads, and standard JEDEC MS-012 outline. Pin 1 is marked by a bevelled corner or notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit serial-in/parallel-out shift register applications.

Compared with SN74HC164N and 74LV164PW, the 74AHCT164D,118 uniquely combines TTL-level input compatibility, +125 °C qualification, and 85 MHz operation - making it optimal for industrial control systems requiring robust, drop-in replacement of legacy 74LS164 without redesign.

Availability

74AHCT164D,118 is available at Aetrix Electronics and suitable for industrial control logic, LED matrix drivers, and microcontroller I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT164D,118 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 leading semiconductor manufacturer headquartered in Nijmegen, Netherlands, specializing in high-performance logic, analog, and discrete components for industrial, automotive, and consumer applications.

The 74AHCT series is designed specifically for TTL-to-CMOS bridging in industrial and legacy-system upgrade applications, emphasizing robustness, wide temperature operation, and pin-for-pin compatibility with standard 74-series logic.

FAQ

What is the maximum clock frequency supported by the 74AHCT164D,118?

The 74AHCT164D,118 supports a maximum clock frequency of 85 MHz at VCC = 5.5 V with a 50 pF load, as specified in Table 7 of the datasheet. This value assumes proper PCB layout, decoupling, and signal integrity - actual achievable frequency may be lower under heavy capacitive loading or marginal rise times.

Can DSA and DSB be used simultaneously for data input?

No - DSA and DSB are mutually enabling inputs: only one may be HIGH to allow data entry through the other. When both are HIGH, no data is loaded; when both are LOW, the register holds its state. This architecture prevents bus contention and enables selective serial data gating.

Is the 74AHCT164D,118 pin-compatible with the 74LS164?

Yes - the 74AHCT164D,118 uses the same SO14 pinout and functional mapping as the 74LS164, including identical DSA, DSB, CP, MR, Q0–Q7, VCC, and GND assignments. Its TTL-compatible inputs and 5 V operation make it a direct, improved-reliability replacement.

Does the master reset (MR) affect the clock input behavior?

No - MR is asynchronous and independent of CP. When MR is LOW, all outputs (Q0–Q7) are forced LOW immediately, regardless of CP state or timing. CP remains fully functional during MR assertion, and the register resumes normal operation on the next valid CP edge after MR returns HIGH.