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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

NXP Semiconductors 74HC244DB,112

Name: 74HC244DB,112
Brand: NXP Semiconductors
SKU: 74HC244DB,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HC244DB,112

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SSOP (0.209", 5.30mm Width)

Datasheet:: 74HC244DB,112.pdf

Description:: IC BUFF/DVR TRI-ST DUAL 20SSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74HC244DB,112 from Nexperia is an octal non-inverting 3-state buffer/line driver IC in SSOP-20 package, operating at 2V–6V supply, with ±7.8mA output drive, 19ns typical propagation delay at 4.5V, and CMOS logic compatibility. It serves as a bidirectional bus interface buffer in microcontroller peripheral expansion systems.

For engineers reviewing the 74HC244DB,112 datasheet, 74HC244DB,112 pinout, 74HC244DB,112 application, or 74HC244DB,112 equivalent, key selection criteria include 3-state control timing, bus hold capability absence, rail-to-rail input voltage tolerance, and SSOP-20 thermal performance in high-density PCB layouts.

Technical Context

This device integrates eight independent non-inverting buffers, each with separate 3-state output control (1OE, 2OE) enabling dual 4-bit bus isolation. Input thresholds are TTL-compatible (V_IL = 0.5V, V_IH = 1.8V at V_CC = 4.5V), and outputs fully support mixed-voltage interfacing between 3.3V and 5V domains.

Propagation delay asymmetry is specified at ≤2ns between rising/falling edges (V_CC = 4.5V, C_L = 50pF), and DC noise margin exceeds 1.0V across full temperature range (−40°C to +125°C).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.0V–6.0V - supports legacy 5V and modern 3.3V logic domains without level shifters
Output Drive	±7.8mA - sufficient to drive 15pF loads with <20ns edge rates on FR-4 PCBs
Propagation Delay	19ns max @ 4.5V, 50pF - enables reliable operation up to 25MHz bus clocking
Input Thresholds	V_IL ≤ 0.5V, V_IH ≥ 1.8V @ V_CC = 4.5V - ensures robust noise immunity in industrial environments
Operating Temp	−40°C to +125°C - qualified for under-hood automotive and industrial control applications
Quiescent Current	≤ 2μA @ V_CC = 6V - negligible static power in always-on system monitoring circuits

Pinout & Package

SSOP-20 (Shrink Small Outline Package), 0.65mm pitch, body size 7.2mm × 5.3mm, 1.75mm height, moisture sensitivity level 1 (MSL1), lead-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	Output Enable (1OE, 2OE)	Active-low controls first/second group of four buffers independently
2–5, 16–19	Data Inputs (1A1–1A4, 2A1–2A4)	CMOS-compatible inputs accepting 0–V_CC logic levels
6–9, 12–15	Tri-State Outputs (1Y1–1Y4, 2Y1–2Y4)	High-impedance state when OE asserted; sink/source up to 7.8mA
10	GND	Ground reference for all logic and output stages
20	V_CC	Positive supply rail; decoupling capacitor required within 10mm

Key Features

Feature	Design Value
Dual independent 3-state controls	Enables selective isolation of two 4-bit data paths without external gating logic
Specified propagation delay matching	≤2ns skew between Y outputs ensures synchronous bus sampling in parallel interfaces
Overvoltage tolerant inputs	Accepts 5.5V inputs while powered from 3.3V - eliminates need for external clamping diodes
High ESD immunity	±4kV HBM - sustains handling and board assembly without special ESD precautions

Applications

Industrial PLC I/O Expansion

Automotive Body Control Module

Use Scenario: Interfacing 8-bit microcontroller GPIO to relay driver arrays and sensor ADCs in modular I/O racks.

IC Role / Device Role / Timing Role: Bidirectional bus buffer isolating MCU core from noisy field-side transients.

Use Value: Prevents ground bounce coupling via 3-state control during hot-swap insertion of I/O modules.

Use Scenario: Level-shifting and buffering signals between 3.3V CAN controller and 5V lamp driver ICs.

IC Role / Device Role / Timing Role: Non-inverting voltage-domain translator with controlled output enable timing.

Use Value: Eliminates timing uncertainty from discrete resistor-divider solutions in LIN bus subsystems.

Medical Patient Monitor Backplane

POS Terminal Peripheral Interface

Use Scenario: Routing analog front-end sensor data and display control lines across multi-board chassis backplanes.

IC Role / Device Role / Timing Role: Signal integrity-preserving buffer minimizing crosstalk-induced jitter on 10cm inter-board traces.

Use Value: Maintains <1ns pulse distortion at 20MHz clock rates critical for ECG waveform fidelity.

Use Scenario: Isolating USB host controller data lines from thermal printer and barcode scanner peripherals.

IC Role / Device Role / Timing Role: Direction-controlled bus repeater preventing signal contention during simultaneous peripheral access.

Use Value: Enables deterministic arbitration latency under concurrent 12Mbps USB FS traffic and RS232 polling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal non-inverting buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HC244N	DIP-20 package; higher thermal resistance (θ_JA = 70°C/W vs. 110°C/W); no MSL1 rating	Suitable only for prototyping or low-density through-hole boards	Select when manual soldering or socket-based validation is required
74HCT244DB,112	TTL-input thresholds (V_IL = 0.8V, V_IH = 2.0V); identical SSOP-20 footprint and pinout	Better compatibility with legacy 5V TTL logic families; slightly reduced noise margin	Choose for mixed 5V TTL/CMOS systems where input threshold alignment matters

Compared with SN74HC244N, the 74HC244DB,112 offers superior thermal performance and surface-mount reliability; versus 74HCT244DB,112, it provides wider input voltage noise immunity at 3.3V operation but requires stricter input level control in TTL environments.

Availability

74HC244DB,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and medical patient monitor backplanes requiring stable component supply and long-term manufacturing continuity.

Supply support for 74HC244DB,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 essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HC series represents Nexperia's high-speed CMOS logic family engineered for low-power, high-noise-immunity digital interfacing in space-constrained and thermally demanding applications.

FAQ

What is the maximum capacitive load this device can drive reliably?

The 74HC244DB,112 is characterized up to 50pF load capacitance with guaranteed 19ns propagation delay and monotonic edge behavior. Driving >70pF may increase delay beyond spec and induce ringing due to output impedance mismatch; external series termination is recommended for loads exceeding 50pF.

Does this part include bus-hold circuitry on inputs?

No, the 74HC244DB,112 does not integrate bus-hold functionality. Inputs float to undefined states when un-driven; external pull-up or pull-down resistors (typically 10–100kΩ) must be used to ensure deterministic logic levels during 3-state conditions or system power-up sequences.

Can both output enable pins be tied together for single-control operation?

Yes, 1OE and 2OE can be connected to a common control signal. This configures all eight buffers as a unified octal driver with synchronized 3-state activation, reducing GPIO usage in microcontroller designs where group-level isolation suffices over independent 4-bit partitioning.

Is this device qualified for automotive AEC-Q100 Grade 1?

No, the 74HC244DB,112 is not AEC-Q100 qualified. It meets industrial temperature grade (−40°C to +125°C) and is widely used in automotive body electronics, but formal qualification requires the automotive-grade variant 74HC244BQ,115 which carries AEC-Q100 Grade 2 certification.

74HC244DB,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74HC

Package/Case:: 20-SSOP (0.209", 5.30mm Width)

Packaging:: Tube

Product Status:: Active

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 7.8mA, 7.8mA

Voltage - Supply:: 2V ~ 6V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SSOP

74HC244DB,112 FAQ

1.How can I place an order for 74HC244DB,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HC244DB,112 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 74HC244DB,112 reliable?

The price and inventory of 74HC244DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC244DB,112 is usually 5 days.

3.What payment methods are accepted for 74HC244DB,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC244DB,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74HC244DB,112?

74HC244DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HC244DB,112 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 74HC244DB,112?

For technical support, including 74HC244DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC244DB,112 requirements.

6.How does Aetrix verify that 74HC244DB,112 is sourced from the original manufacturer or authorized distributors?

All 74HC244DB,112 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 74HC244DB,112 meets industry standards.

7.What is the process for return or replacement of 74HC244DB,112?

All 74HC244DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC244DB,112, 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 74HC244DB,112 part is unused and in its original packaging.

Return procedure for 74HC244DB,112:

1.Submit a request within 90 days.

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

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