Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Logic > Shift Registers

Diodes Incorporated 74HCT164D14

Name: 74HCT164D14
Brand: Diodes Incorporated
SKU: 74HCT164D14
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 74HCT164D14

Manufacturer:: Diodes Incorporated

Category:: Shift Registers

Package:: 14-DIP (0.300", 7.62mm)

Datasheet:: 74HCT164D14.pdf

Description:: LOGIC HCT STD DIP-14

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,283

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

74HCT164D14 from Diodes Incorporated is an 8-bit serial-in/parallel-out edge-triggered shift register with asynchronous master reset, TTL-compatible inputs, Schmitt-trigger input action, and dual serial data inputs (DSA/DSB) logically ANDed for flexible enable/data control. It operates from 4.5V to 5.5V, delivers 4mA output drive at V_CC = 4.5V, and supports up to 55MHz clock frequency at 4.5V - used in PC peripheral interface logic and optical drive control circuits.

For engineers reviewing the 74HCT164D14 datasheet, 74HCT164D14 pinout, 74HCT164D14 application, or 74HCT164D14 equivalent, key selection criteria include asynchronous reset behavior, dual-input serial gating, propagation delay (≤36ns at 4.5V), output drive capability (4mA sink/source), and PDIP-14 package compatibility with legacy through-hole PCB layouts.

Technical Context

The 74HCT164D14 implements a synchronous 8-stage D-type flip-flop chain with positive-edge clock (CP) triggering and asynchronous active-low master reset (MR). Serial data enters Q0 only on rising CP edges when DSA and DSB are both HIGH, and internal stage-to-stage transfer occurs simultaneously across all eight outputs.

All inputs feature Schmitt-trigger action for noise immunity, and the device maintains TTL-compatible voltage thresholds (V_IL ≤ 0.8V, V_IH ≥ 2.0V) while operating on CMOS-level supply current (I_CC ≤ 160μA over temperature). Output stages are fully buffered with symmetrical rise/fall times (t_T ≤ 22ns).

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	HCT - TTL-compatible CMOS with 4.5–5.5V operation and low static power
Function	8-bit serial-in/parallel-out shift register with asynchronous MR and dual ANDed serial inputs
Max Clock Frequency	55 MHz at V_CC = 4.5V - enables high-speed data serialization in legacy bus interfaces
Output Drive	±4 mA at V_CC = 4.5V - sufficient to directly drive LED segments or TTL inputs without buffering
Propagation Delay	36 ns max (CP to Qn, V_CC = 4.5V) - ensures timing margin in 20+ ns clock domains
Input Hysteresis	Schmitt-trigger inputs (typ. 0.8V hysteresis) - rejects <100mV noise on slow-rising control lines
ESD Protection	2 kV HBM, 200 V MM, >1 kV CDM - meets industrial handling requirements without external protection

Pinout & Package

74HCT164D14 uses a 14-pin plastic dual in-line package (PDIP-14) with 0.3-inch body width and standard through-hole mounting footprint.

Pin/Terminal	Circuit Role	Design Meaning
1 (DSA)	Serial Data Input A	One of two ANDed inputs; tied HIGH to disable, used with DSB for gated serial entry
2 (DSB)	Serial Data Input B	Second ANDed input; enables hardware-selectable data path or enable-controlled loading
3 (Q0)	Stage 0 Output	First-stage parallel output; receives serial data on CP rising edge
4 (Q1)	Stage 1 Output	Shifted copy of Q0; provides 1-bit pipeline delay for timing alignment
5 (Q2)	Stage 2 Output	Third parallel output; used in 3-bit address latching or LED scan sequencing
6 (Q3)	Stage 3 Output	Fourth output; commonly connected to microcontroller GPIO for status expansion
7 (GND)	Ground Reference	Primary return path for all I/O and internal logic; must be low-impedance for noise control
8 (CP)	Clock Pulse Input	Positive-edge-triggered control signal; determines exact data shift timing
9 (MR)	Master Reset	Asynchronous active-low reset; forces all Q0–Q7 LOW independent of CP or data state
10 (Q4)	Stage 4 Output	Fifth parallel output; supports 5-bit parallel data capture in legacy ISA-style interfaces
11 (Q5)	Stage 5 Output	Sixth output; used in 6-bit DAC control or segmented display drivers
12 (Q6)	Stage 6 Output	Seventh output; provides intermediate latch point before final stage
13 (Q7)	Stage 7 Output	Last-stage parallel output; indicates full 8-bit shift completion; often used as carry flag
14 (V_CC)	Supply Voltage	+4.5V to +5.5V DC; powers all logic and output buffers; bypass capacitor required at pin

Key Features

Feature	Design Value
Dual ANDed serial inputs (DSA/DSB)	Enables hardware-selectable data source or synchronous enable gating without external logic
Asynchronous master reset (MR)	Guarantees known state on power-up or fault recovery, independent of clock or data timing
Schmitt-trigger inputs	Eliminates need for external RC filtering on noisy control lines (e.g., mechanical switch debouncing)
TTL-compatible voltage thresholds	Directly interfaces with legacy 74LS/74F logic without level-shifting components
PDIP-14 package	Supports prototyping, repair, and industrial control systems requiring through-hole reliability

Applications

PC Peripheral Interface

Optical Drive Control

Use Scenario: Expanding GPIO count on legacy ISA-bus embedded controllers to manage CD-ROM tray motor enable, laser power, and spindle speed signals.

IC Role / Device Role / Timing Role: Serial-to-parallel converter that translates microcontroller SPI-like bitstream into 8-bit parallel control bus synchronized to system clock.

Use Value: Reduces MCU pin count by 7 while maintaining deterministic 8-bit update timing via single CP edge - critical for motor commutation sequencing.

Use Scenario: Driving segment-select lines in DVD-ROM front-panel LED displays using microcontroller UART TX line as serial data source.

IC Role / Device Role / Timing Role: Shift register acting as UART-to-parallel bridge; DSA tied HIGH, DSB driven by UART, CP derived from system timer.

Use Value: Enables reuse of existing UART hardware for display control without adding dedicated display controller IC or firmware overhead.

Legacy Industrial PLC I/O

Hard Disk Drive LED Indicators

Use Scenario: Isolating and expanding digital output channels in DIN-rail mounted PLC modules controlling solenoid valves and relay banks.

IC Role / Device Role / Timing Role: Parallel-output shift register providing galvanically isolated 8-bit output latch, reset by system watchdog pulse.

Use Value: MR pin allows centralized fail-safe reset across multiple 74HCT164D14 units - ensuring all outputs go LOW during watchdog timeout or brownout.

Use Scenario: Controlling activity LEDs (read/write/access) on 3.5" HDD backplanes where space constraints prohibit SMT packages.

IC Role / Device Role / Timing Role: Level-shifting and fanout buffer converting low-current SATA LED control signals into 4mA-capable drive for through-hole LEDs.

Use Value: PDIP-14 footprint matches legacy HDD PCB tooling; ±4mA drive eliminates need for discrete transistor buffers per LED.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT164N	Same logic function and pinout; TI version uses different process - slightly higher I_CC (max 200μA vs. 160μA) and lower f_MAX (50MHz @4.5V)	Valid for drop-in replacement where board layout matches PDIP-14, but marginal in 55MHz designs	Select if sourcing from TI-authorized channels; verify timing margins in high-frequency use cases
74HC164N	Pin-compatible but non-TTL-compatible - V_IH = 3.15V min (vs. 2.0V), no Schmitt inputs, higher speed (f_MAX = 88MHz @6V)	Requires level-shifting when interfacing with 74LS/74F; unsuitable for noisy industrial environments without external filtering	Choose only when driving pure CMOS loads and system V_CC is stable at 4.5–6.0V

Compared with SN74HCT164N and 74HC164N, the 74HCT164D14 uniquely combines TTL-compatible thresholds, Schmitt-trigger noise immunity, and guaranteed 55MHz operation in PDIP-14 - making it optimal for retrofitting legacy industrial and PC peripheral designs where signal integrity and pin compatibility are non-negotiable.

Availability

74HCT164D14 is available at Aetrix Electronics and suitable for PC peripheral interface design, optical drive control systems, and legacy industrial PLC I/O expansion requiring stable component supply, long-lifecycle support, and through-hole assembly compatibility.

Supply support for 74HCT164D14 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, industry-qualified components for computing, industrial, and consumer applications.

The 74HCT164D14 belongs to Diodes' HCT logic family - engineered for seamless interoperability with legacy TTL systems while delivering CMOS power efficiency and robust ESD performance in through-hole packages.

FAQ

Can 74HCT164D14 operate at 3.3V?

No. The 74HCT164D14 is specified only for 4.5V to 5.5V operation per its Recommended Operating Conditions. At 3.3V, input thresholds (V_IH ≥ 2.0V) become unreliable, and output drive falls below specification. Use 74LV164 or 74LVC164 for 3.3V systems.

What happens if DSA and DSB are left floating?

Leaving DSA or DSB floating violates the Recommended Operating Conditions, which require unused inputs to be tied to V_CC or GND. Floating inputs may cause erratic shifting due to noise coupling or partial turn-on of internal gates, leading to metastability or unintended data corruption.

Is the MR pin truly asynchronous?

Yes. The MR pin operates asynchronously: asserting MR LOW immediately forces Q0–Q7 to LOW regardless of CP state, DSA/DSB levels, or internal shift register contents. Recovery requires MR to be held HIGH for t_rec ≥ 24ns before the next CP rising edge.

Does 74HCT164D14 support hot insertion?

No. The device lacks hot-swap protection features such as power-up sequencing control, I_OFF isolation, or bus-hold circuitry. Inserting or removing it while powered risks latch-up, ESD damage, or transient glitches on shared V_CC/GND nets.

74HCT164D14 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: 74HCT

Package/Case:: 14-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Active

Logic Type:: Shift Register

Output Type:: Push-Pull

Number of Elements:: 1

Number of Bits per Element:: 8

Function:: Serial to Parallel

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-PDIP

74HCT164D14 FAQ

1.How can I place an order for 74HCT164D14 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HCT164D14 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 74HCT164D14 reliable?

The price and inventory of 74HCT164D14 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT164D14 is usually 5 days.

3.What payment methods are accepted for 74HCT164D14?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT164D14 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74HCT164D14?

74HCT164D14 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HCT164D14 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 74HCT164D14?

For technical support, including 74HCT164D14 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT164D14 requirements.

6.How does Aetrix verify that 74HCT164D14 is sourced from the original manufacturer or authorized distributors?

All 74HCT164D14 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74HCT164D14 meets industry standards.

7.What is the process for return or replacement of 74HCT164D14?

All 74HCT164D14 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT164D14, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 74HCT164D14 part is unused and in its original packaging.

Return procedure for 74HCT164D14:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…