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

Nexperia USA Inc. 74VHCT244BQ,115

Name: 74VHCT244BQ,115
Brand: Nexperia USA Inc.
SKU: 74VHCT244BQ,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHCT244BQ,115

Manufacturer:: Nexperia USA Inc.

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-VFQFN Exposed Pad

Datasheet:: 74VHCT244BQ,115.pdf

Description:: IC BUF NON-INVERT 5.5V 20DHVQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74VHCT244BQ,115 from Nexperia is an octal non-inverting 3-state buffer/line driver in DHVQFN20 package, operating at 4.5 V to 5.5 V supply with TTL-compatible inputs, 3.5 ns typical propagation delay (CL = 15 pF), ±8 mA output drive, and -40 °C to +125 °C temperature range - used for bidirectional bus interfacing in industrial control backplanes.

For engineers reviewing the 74VHCT244BQ,115 datasheet, 74VHCT244BQ,115 pinout, 74VHCT244BQ,115 application, or 74VHCT244BQ,115 equivalent, key selection considerations include TTL-level input compatibility, 20-terminal thermal-enhanced QFN footprint, 3-state enable timing (t_en ≤ 9.5 ns), and industrial-grade thermal derating (12.9 mW/K above 111 °C).

Technical Context

The 74VHCT244BQ,115 implements two independent 4-bit non-inverting buffer groups (1A0–1A3 / 2A0–2A3 → 1Y0–1Y3 / 2Y0–2Y3), each controlled by dedicated active-low output enable inputs (1OE, 2OE). Its TTL-input threshold (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V at V_CC = 4.5–5.5 V) ensures direct compatibility with legacy 5 V logic families without level translation.

Internal Schmitt-trigger action on all inputs improves noise immunity, while balanced propagation delays (t_PLH ≈ t_PHL) and low output capacitance (C_O = 4.0 pF) support clean signal integrity in high-speed parallel bus applications up to 100 MHz under 15 pF load.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - supports standard 5 V systems with 10% tolerance margin
Input Logic Type	TTL-compatible - accepts 0.8 V max LOW and 2.0 V min HIGH thresholds, eliminating external level shifters
Propagation Delay	3.5 ns (typ) at V_CC = 5 V, CL = 15 pF - enables sub-100 MHz bus operation with timing margin
Output Drive	±8 mA - sufficient to drive 50 Ω transmission lines or 10 LSTTL loads directly
Operating Temperature	-40 °C to +125 °C - qualified for extended industrial and under-hood embedded environments
Power Dissipation	500 mW max at T_amb ≤ 111 °C; derates 12.9 mW/K above - matches thermal performance of DHVQFN20 package
ESD Protection	HBM > 2000 V, CDM > 1000 V - meets IEC 61000-4-2 Level 2 for board-level robustness

Pinout & Package

DHVQFN20 (SOT764-1) package: 2.5 mm × 4.5 mm × 0.85 mm body, 20-terminal no-lead quad flat design with exposed thermal pad (non-soldered by default); optimized for high-density PCB layouts and improved thermal resistance (R_θJA ≈ 78 K/W).

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low enable inputs - independently disable Group 1 (pins 2,4,6,8 → 18,16,14,12) or Group 2 (pins 17,15,13,11 → 3,5,7,9)
2, 4, 6, 8	1A0–1A3	Group 1 data inputs - routed to outputs 1Y0–1Y3 when 1OE = LOW
17, 15, 13, 11	2A0–2A3	Group 2 data inputs - routed to outputs 2Y0–2Y3 when 2OE = LOW
18, 16, 14, 12	1Y0–1Y3	Group 1 buffered outputs - high-impedance when 1OE = HIGH
3, 5, 7, 9	2Y0–2Y3	Group 2 buffered outputs - high-impedance when 2OE = HIGH
10	GND	Ground reference - 0 V return path for all internal circuitry and I/O
20	V_CC	Positive supply - powers CMOS core and output drivers; decoupling required within 3 mm

Key Features

Feature	Design Value
Schmitt-trigger inputs	Improves noise immunity on slow-rising or noisy control signals (e.g., mechanical switch interfaces)
TTL-compatible input thresholds	Eliminates need for external level-shifting when interfacing with 74LS/74F logic families
Balanced t_PLH/t_PHL	Ensures symmetrical rise/fall timing across all 8 outputs - critical for synchronous bus timing closure
Thermal-enhanced DHVQFN20	Reduces junction-to-ambient thermal resistance by ~35% vs. SO20, enabling higher sustained drive current
Industrial temperature range	Validated operation from -40 °C to +125 °C - suitable for programmable logic controllers and motor drives

Applications

Industrial Backplane Interface

Legacy System Bus Extension

Use Scenario: Isolating and driving a 5 V parallel address/data bus between a microcontroller and multiple peripheral modules in a DIN-rail mounted PLC rack.

IC Role / Device Role / Timing Role: Octal 3-state buffer providing direction-controlled signal isolation and fanout amplification with precise enable timing.

Use Value: Enables hot-swappable module insertion without bus contention; t_dis ≤ 11.5 ns prevents glitches during state transitions.

Use Scenario: Extending the data bus of a vintage 8051-based instrumentation system to add new ADC/DAC daughterboards while preserving signal integrity.

IC Role / Device Role / Timing Role: TTL-input compatible line driver translating between original 74LS logic levels and modern peripherals.

Use Value: Eliminates discrete resistor networks or dedicated level translators; VIH/VIL specs match 74LS output swing exactly.

Motor Control I/O Expansion

Test Equipment Signal Conditioning

Use Scenario: Buffering digital control signals (enable, direction, step) from an FPGA to multiple stepper motor driver ICs in a CNC motion controller.

IC Role / Device Role / Timing Role: High-current (±8 mA) non-inverting buffer ensuring fast edge delivery to gate drivers despite PCB trace capacitance.

Use Value: Reduces signal rise time degradation over 10 cm traces; C_O = 4.0 pF minimizes capacitive loading on source FPGA pins.

Use Scenario: Driving multiple DUT interface channels in automated test equipment where signal fidelity and channel isolation are critical.

IC Role / Device Role / Timing Role: 3-state-enabled bus transceiver allowing shared test head resources across 8 independent measurement paths.

Use Value: Independent OE control per group permits selective channel activation; low ICC (≤80 μA) reduces system power budget impact.

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
SN74HCT244PWR	Same TTL input thresholds and 20-pin TSSOP package, but lower max t_pd (3.2 ns typ), higher ICC (100 μA max), and narrower temp range (-40 °C to +85 °C)	Preferred for commercial-grade, space-constrained designs requiring minimal propagation delay	Select when ambient temperature stays below 85 °C and PCB area favors TSSOP over QFN
74VHC244BQ,115	CMOS-input version (VIH ≥ 3.85 V at V_CC = 5.5 V); otherwise identical pinout, timing, and package	Required for mixed-voltage systems where upstream logic uses CMOS-level signaling (e.g., 3.3 V MCU driving 5 V bus)	Choose only when interfacing with CMOS-output sources - not interchangeable with 74VHCT244BQ,115 in TTL-driven systems

Compared with SN74HCT244PWR, the 74VHCT244BQ,115 offers extended temperature capability (+125 °C) and lower quiescent current, while the 74VHC244BQ,115 variant provides strict CMOS input compatibility - making the 74VHCT244BQ,115 optimal for ruggedized 5 V industrial bus interfaces demanding both reliability and TTL interoperability.

Availability

74VHCT244BQ,115 is available at Aetrix Electronics and suitable for industrial backplane interfaces, motor control I/O expansion, legacy system bus extension, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for 74VHCT244BQ,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 logic, analog, and MOSFET solutions, with manufacturing rooted in process innovation and automotive-grade quality systems.

The 74VHCT244BQ,115 belongs to Nexperia's VHCT logic family - engineered specifically for seamless integration between TTL and CMOS systems in industrial and infrastructure applications requiring robust 5 V operation.

FAQ

What is the maximum clock frequency supported by the 74VHCT244BQ,115 in a bus application?

The 74VHCT244BQ,115 does not operate as a clocked device but as a combinatorial buffer. Its usable frequency limit is determined by propagation delay and load capacitance: with t_pd ≤ 9.5 ns (max, CL = 50 pF) and balanced edges, it reliably supports parallel bus data rates up to 50 MHz (20 ns period) while maintaining setup/hold margins. Higher frequencies require careful PCB layout to minimize trace inductance and crosstalk.

Can the thermal pad on the DHVQFN20 package be soldered to improve thermal performance?

Yes - the exposed thermal pad (terminal 1 index area) may be soldered to a PCB copper pour, but must remain electrically floating or connected to GND per Nexperia's recommendation. Soldering improves thermal resistance by ~25%, lowering junction temperature by up to 15 °C at full 500 mW dissipation. A 4×4 array of 0.3 mm thermal vias to inner ground planes is recommended for optimal conduction.

How does the 74VHCT244BQ,115 handle input voltages exceeding V_CC?

All inputs accept voltages up to 7.0 V regardless of V_CC level, per Absolute Maximum Ratings. This allows safe interfacing with 5 V signals even when V_CC is powered down (0 V), preventing back-powering of upstream logic. Input clamping current is limited to ±20 mA, so external series resistors are advised if sustained overvoltage > 5.5 V is expected.

Is the 74VHCT244BQ,115 pin-compatible with the 74VHC244BQ,115?

Yes - both share identical DHVQFN20 (SOT764-1) pinout, package dimensions, and electrical connections. However, their input voltage thresholds differ: 74VHCT244BQ,115 accepts TTL levels (V_IL ≤ 0.8 V), while 74VHC244BQ,115 requires CMOS levels (V_IL ≤ 1.65 V at V_CC = 5.5 V). Swapping them without verifying source logic family risks incorrect logic interpretation.

74VHCT244BQ,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: 74VHCT

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:: 8mA, 8mA

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-DHVQFN (4.5x2.5)

74VHCT244BQ,115 FAQ

1.How can I place an order for 74VHCT244BQ,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHCT244BQ,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 74VHCT244BQ,115 reliable?

The price and inventory of 74VHCT244BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT244BQ,115 is usually 5 days.

3.What payment methods are accepted for 74VHCT244BQ,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT244BQ,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHCT244BQ,115?

74VHCT244BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHCT244BQ,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 74VHCT244BQ,115?

For technical support, including 74VHCT244BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT244BQ,115 requirements.

6.How does Aetrix verify that 74VHCT244BQ,115 is sourced from the original manufacturer or authorized distributors?

All 74VHCT244BQ,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 74VHCT244BQ,115 meets industry standards.

7.What is the process for return or replacement of 74VHCT244BQ,115?

All 74VHCT244BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT244BQ,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 74VHCT244BQ,115 part is unused and in its original packaging.

Return procedure for 74VHCT244BQ,115:

1.Submit a request within 90 days.

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

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