Nexperia USA Inc. 74AHCT164PW,112

Overview

74AHCT164PW,112 from Nexperia is an 8-bit serial-in/parallel-out shift register with dual active-HIGH data inputs (DSA and DSB), eight CMOS-compatible parallel outputs (Q0–Q7), edge-triggered clock (CP) on LOW-to-HIGH transitions, and asynchronous master reset (MR). It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and features TTL-level input thresholds for direct interfacing with legacy logic. Used in LED matrix drivers and microcontroller GPIO expansion.

For engineers reviewing the 74AHCT164PW,112 datasheet, 74AHCT164PW,112 pinout, 74AHCT164PW,112 application, or 74AHCT164PW,112 equivalent, key selection criteria include its dual-input data enable architecture, 11.5 ns max propagation delay at 5 V/50 pF, MR-active-LOW timing behavior, and TSSOP14 package compatibility with high-density PCB layouts.

Technical Context

This device implements a synchronous 8-stage shift register with independent serial data gating: either DSA or DSB can serve as an active-HIGH enable for the other, enabling flexible data routing without external logic. The register updates on every rising edge of CP, and MR forces all Q outputs LOW asynchronously-regardless of CP state or input levels.

Input thresholds are TTL-compatible (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), ensuring robust interfacing with 5 V microcontrollers and legacy peripherals. Overvoltage-tolerant inputs (up to 5.5 V) allow safe operation in mixed-voltage systems where signal lines may exceed VCC.

Key Specifications

Pinout & Package

TSSOP14 plastic thin shrink small outline package (SOT402-1); 14-lead, 4.4 mm body width, 0.65 mm pitch; thermally enhanced for high-reliability industrial use.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHC164PW,112 and SN74HC164PWR, the 74AHCT164PW,112 uniquely balances TTL compatibility, overvoltage safety, and industrial temperature support - making it optimal for upgrading legacy 5 V systems without compromising robustness.

Availability

74AHCT164PW,112 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller GPIO expansion, industrial control bus interfaces, and legacy system logic bridging requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT164PW,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 delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial, automotive, and computing applications.

The 74AHCT series targets robust 5 V logic interfacing, emphasizing TTL compatibility, wide temperature operation, and overvoltage resilience for industrial control and legacy system upgrades.

FAQ

What is the minimum pulse width required on the CP and MR inputs?

The minimum HIGH and LOW pulse width for both CP and MR is 5.0 ns across the full operating range (VCC = 4.5 V to 5.5 V, -40 °C to +125 °C). This ensures reliable edge detection and reset assertion without metastability or partial register clearing. Pulse widths below this threshold may result in skipped clock cycles or incomplete reset behavior.

Can DSA and DSB be driven simultaneously with different logic levels?

Yes - driving DSA = HIGH and DSB = LOW enables data entry through DSA, while DSA = LOW and DSB = HIGH enables data entry through DSB. If both are HIGH, data appears on both paths (redundant); if both are LOW, no new data is latched. This dual-input structure allows hardware-selectable data routing without external logic gates.

Is the 74AHCT164PW,112 compatible with 3.3 V microcontrollers?

Yes - the device accepts 3.3 V logic levels on CP, DSA, and DSB when VCC = 5 V, due to overvoltage-tolerant inputs rated to 5.5 V. However, output levels will be 5 V, so external level-shifting is required if driving 3.3 V inputs. For full 3.3 V system compatibility, consider the 74AHC164 variant instead.

Does the MR pin require a pull-up resistor in normal operation?

Yes - MR is active LOW and internally unconnected; a 10 kΩ pull-up to VCC is recommended to prevent spurious resets from floating input. During system initialization or fault recovery, MR should be actively driven LOW for ≥5 ns to guarantee complete register clearing, per the datasheet's tWL specification.