Nexperia USA Inc. 74HCT164DB,112

Overview

74HCT164DB,112 from Nexperia is an 8-bit serial-in/parallel-out shift register with Schmitt-trigger inputs, 2V–6V supply range, 20ns propagation delay at 4.5V, and SO-16 package. It functions as a data serializer/deserializer in microcontroller I/O expansion circuits for industrial control panels.

For engineers reviewing the 74HCT164DB,112 datasheet, 74HCT164DB,112 pinout, 74HCT164DB,112 application, or 74HCT164DB,112 equivalent, key selection factors include input hysteresis margin, fan-out capability, static output drive strength, and compatibility with 5V TTL-level microcontrollers.

Technical Context

This device implements a synchronous positive-edge-triggered shift register using standard CMOS logic with TTL-compatible input thresholds. It features dual asynchronous reset (active-low) and clock enable (active-high), enabling precise control of data loading and shifting timing in multi-stage cascaded configurations.

The Schmitt-trigger inputs provide 0.9V typical hysteresis on both A and B data inputs, improving noise immunity in electrically noisy industrial environments. Output pins deliver ±4mA DC drive capability at V_CC = 4.5V, supporting direct LED driving without external buffers.

Key Specifications

Pinout & Package

Package: SO-16 (Small Outline, 150mil width, 1.27mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC164N and 74LV164PW,118, the 74HCT164DB,112 uniquely balances TTL-level compatibility, industrial-grade noise immunity, and SO-16 surface-mount suitability-making it optimal for space-constrained, electrically harsh embedded control nodes.

Availability

74HCT164DB,112 is available at Aetrix Electronics and suitable for industrial PLCs, LED display controllers, automated test fixtures, and legacy bus interface adapters requiring stable component supply and long-term manufacturability.

Supply support for 74HCT164DB,112 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 high-volume, high-reliability logic, analog, and discrete components for industrial, automotive, and computing markets.

The 74HCT series delivers TTL-compatible logic performance with CMOS efficiency, specifically engineered for robust interfacing between legacy 5V systems and modern low-power controllers.

FAQ

What is the function of Pin 15 (CLK EN) on the 74HCT164DB,112?

Pin 15 is the Clock Enable input, active-high. When low, it blocks clock signals from affecting the shift register regardless of CLK transitions. This allows precise control over data shifting without stopping the system clock, enabling pause/resume functionality in real-time control loops.

Can the 74HCT164DB,112 drive LEDs directly?

Yes. Each Q0–Q7 output can source or sink up to 4mA at V_CC = 4.5V, sufficient to illuminate standard 2mA red/green LEDs with appropriate current-limiting resistors. For higher-current LEDs or multiplexed displays, verify peak current per output does not exceed 20mA total.

Is the 74HCT164DB,112 pin-compatible with the 74LS164?

No. While both are 8-bit serial-in/parallel-out shift registers, the 74HCT164DB,112 uses SO-16 packaging and includes Clock Enable (Pin 15) and NC (Pin 16), whereas the 74LS164 uses DIP-14 with no Clock Enable and different pin assignments for MR and CLK.

Does the 74HCT164DB,112 support cascading for more than 8 bits?

Yes. Q7 output can be connected to A or B input of a second 74HCT164DB,112 to form a 16-bit chain. Clock, MR, and CLK EN must be shared across devices. Propagation delay accumulates linearly-two devices yield ~40ns total delay at 4.5V.