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

Nexperia USA Inc. 74HC244BQ,115

Name: 74HC244BQ,115
Brand: Nexperia USA Inc.
SKU: 74HC244BQ,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HC244BQ,115

Manufacturer:: Nexperia USA Inc.

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-VFQFN Exposed Pad

Datasheet:: 74HC244BQ,115.pdf

Description:: IC BUF NON-INVERT 6V 20DHVQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74HC244BQ,115 from Nexperia is an octal non-inverting 3-state buffer/line driver in DHVQFN20 package, operating from 2.0 V to 6.0 V supply, featuring dual independent output enables (1OE, 2OE), CMOS-level input compatibility, and −40 °C to +125 °C temperature range. It serves as bidirectional bus interface or address/data line driver in microcontroller peripheral expansion systems.

For engineers reviewing the 74HC244BQ,115 datasheet, 74HC244BQ,115 pinout, 74HC244BQ,115 application, or 74HC244BQ,115 equivalent, key selection criteria include 3-state timing (t_en = 10 ns typ @ V_CC = 6.0 V), input clamp diode support for overvoltage-tolerant interfacing, dual enable control per 4-bit group, and thermal-enhanced QFN packaging for high-density PCB layouts.

Technical Context

This device implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low output enable (1OE for Y0–Y3, 2OE for Y4–Y7). Inputs accept CMOS logic levels and include internal clamp diodes enabling safe interfacing with signals exceeding V_CC when used with current-limiting resistors.

Output behavior follows strict 3-state logic: outputs enter high-impedance OFF-state when corresponding nOE is HIGH; otherwise, outputs replicate inputs with non-inverting polarity. Propagation delay is 9 ns typical (V_CC = 6.0 V, C_L = 15 pF), and disable/enable times are matched at 10–11 ns typical under same conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage range	2.0 V to 6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU to 5 V peripheral bus)
Propagation delay (t_pd)	9 ns typical @ V_CC = 6.0 V, C_L = 15 pF - enables reliable operation in 50 MHz+ digital buses
Enable/disable time (t_en/t_dis)	10 ns typical @ V_CC = 6.0 V - ensures precise 3-state control timing for bus arbitration
Output drive strength	±35 mA DC output current - sufficient to drive multiple TTL loads or 15 pF transmission lines
Input clamp diode rating	±20 mA clamping current - allows safe interface to voltages up to V_CC + 0.5 V using external series resistors
Operating temperature	−40 °C to +125 °C - qualified for industrial and extended-temperature embedded control applications
Power dissipation (P_tot)	500 mW max @ T_amb ≤ 111 °C (DHVQFN20) - thermal enhancement supports sustained bus activity

Pinout & Package

DHVQFN20 (SOT764-1) package: 2.5 × 4.5 × 0.85 mm body, 20-terminal no-lead quad flat design with exposed thermal pad (GND-connected recommended); pin 1 index marked on top surface; terminal 1 is 1Y3.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output enables - independently control impedance state of first/second 4-bit output group
2, 4, 6, 8	1A0–1A3	Data inputs for first buffer section - routed to outputs 1Y0–1Y3 when 1OE = LOW
3, 5, 7, 9	2Y0–2Y3	Outputs for second buffer section - driven by inputs 2A0–2A3 when 2OE = LOW
10	GND	Ground reference - also serves as thermal pad anchor; must be connected to PCB ground plane
11, 13, 15, 17	2A0–2A3	Data inputs for second buffer section - routed to outputs 2Y0–2Y3 when 2OE = LOW
12, 14, 16, 18	1Y0–1Y3	Outputs for first buffer section - driven by inputs 1A0–1A3 when 1OE = LOW
20	V_CC	Positive supply - decoupling capacitor (100 nF) required within 3 mm of this pin

Key Features

Feature	Design Value
Dual independent 4-bit 3-state control	Enables selective bus isolation - e.g., isolate memory vs. I/O peripherals without full bus shutdown
CMOS input compatibility (74HC)	VIH = 3.15 V min @ VCC = 4.5 V - ensures robust noise margin in 3.3 V systems with 100 mV noise floor
Input clamp diodes	Supports overvoltage-tolerant interface - permits direct connection to 5 V signals via 1 kΩ series resistor
JEDEC-compliant ESD protection	HBM > 2000 V, CDM > 1000 V - meets industrial handling requirements without additional protection circuitry
Thermal-enhanced DHVQFN20	12.9 mW/K derating above 111 °C - sustains 500 mW power at ambient up to 111 °C before derating begins

Applications

Industrial PLC I/O Expansion

Microcontroller Address Bus Buffering

Use Scenario: Isolating and driving 8-bit parallel I/O ports between ARM Cortex-M4 controller and field-side relay modules.

IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing level-shifted, slew-controlled signal routing with independent group enables for port partitioning.

Use Value: Enables hot-swap-safe I/O reconfiguration via 1OE/2OE sequencing while maintaining <10 ns timing alignment across all 8 outputs.

Use Scenario: Driving 8-bit address lines from an FPGA to multiple memory-mapped peripherals in a compact edge-computing module.

IC Role / Device Role / Timing Role: Low-skew octal buffer ensuring simultaneous valid address assertion across 8 lines with matched t_pd (±1 ns variation).

Use Value: Eliminates address skew-induced setup violations in 25 MHz memory access cycles, verified by 9 ns typical propagation delay.

Legacy Parallel Printer Interface

Test Equipment Signal Conditioning

Use Scenario: Interfacing a modern SoC's GPIO bank to a Centronics-compatible printer port requiring 5 V tolerant, high-drive capability.

IC Role / Device Role / Timing Role: Voltage-level translating buffer with ±35 mA drive per output and input clamp diodes for legacy 5 V signal compatibility.

Use Value: Removes need for discrete level shifters or series resistors - direct connection possible using internal clamps and 5 V V_CC.

Use Scenario: Conditioning and isolating 8-channel digital stimulus signals in automated test equipment with shared backplane routing.

IC Role / Device Role / Timing Role: 3-state bus driver enabling dynamic channel assignment and preventing signal contention during multi-site testing.

Use Value: Dual OE pins allow real-time reconfiguration of 4-channel subsets without disrupting other channels - critical for parallel DUT testing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74HCT244BQ,115	TTL-compatible inputs (VIH = 2.0 V min @ V_CC = 5 V); identical pinout and timing	Required when interfacing 5 V TTL logic families or legacy microcontrollers with TTL output thresholds	Select for mixed-logic systems where source drivers lack CMOS-level swing but require same buffering function
SN74LVC244APWR	Lower V_CC range (1.65–3.6 V); 3.3 V only; 24 mA drive; smaller TSSOP20 package	Suitable for low-voltage portable electronics; not compatible with 5 V buses or industrial temperature range	Choose only for cost-sensitive 3.3 V-only designs where −40 °C to +125 °C operation is unnecessary

Compared with 74HC244BQ,115, the 74HCT244BQ,115 offers identical form-factor and timing but enables seamless integration into legacy 5 V TTL environments, whereas SN74LVC244APWR reduces board space and power at the expense of voltage flexibility and extended temperature qualification.

Availability

74HC244BQ,115 is available at Aetrix Electronics and suitable for industrial automation controllers, embedded test instrumentation, and high-reliability data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC244BQ,115 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 specializing in high-performance, energy-efficient logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HC244BQ,115 belongs to Nexperia's industry-standard 74HC logic family, designed specifically for robust, low-power bus interfacing in harsh-environment embedded systems demanding wide voltage operation and extended temperature reliability.

FAQ

What is the maximum clock frequency supported by the 74HC244BQ,115?

The 74HC244BQ,115 is not a clocked device and has no inherent clock frequency limit. Its usable data rate depends on propagation delay (9 ns typical @ 6 V) and load capacitance. For 15 pF loads, it reliably supports bus toggle rates up to 50 MHz, assuming clean edges and proper termination.

Can 74HC244BQ,115 drive a 50 Ω transmission line directly?

No - its ±35 mA DC output drive is insufficient for direct 50 Ω line driving. It requires external series termination (e.g., 33 Ω resistor) or a dedicated line driver IC. The device is intended for point-to-point or multidrop bus loading up to 15 pF, not RF impedance matching.

Is the thermal pad (pin 10) required to be soldered to GND?

Per datasheet SOT764-1 specification, the exposed pad is not electrically required to be connected, but thermal performance mandates connection to a PCB ground plane. If soldered, it must remain floating or tied to GND - never left unconnected or biased to another potential.

Does 74HC244BQ,115 support hot insertion or live bus swapping?

Yes - its input clamp diodes and 3-state architecture support hot insertion when used with current-limiting resistors on inputs and controlled OE sequencing. However, V_CC must be stable before asserting signals; no built-in hot-swap charge control is provided.

74HC244BQ,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: 74HC

Package/Case:: 20-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

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-DHVQFN (4.5x2.5)

74HC244BQ,115 FAQ

1.How can I place an order for 74HC244BQ,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HC244BQ,115 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 74HC244BQ,115 reliable?

The price and inventory of 74HC244BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC244BQ,115 is usually 5 days.

3.What payment methods are accepted for 74HC244BQ,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC244BQ,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74HC244BQ,115?

74HC244BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HC244BQ,115 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 74HC244BQ,115?

For technical support, including 74HC244BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC244BQ,115 requirements.

6.How does Aetrix verify that 74HC244BQ,115 is sourced from the original manufacturer or authorized distributors?

All 74HC244BQ,115 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 74HC244BQ,115 meets industry standards.

7.What is the process for return or replacement of 74HC244BQ,115?

All 74HC244BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC244BQ,115, 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 74HC244BQ,115 part is unused and in its original packaging.

Return procedure for 74HC244BQ,115:

1.Submit a request within 90 days.

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

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