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Texas Instruments SN74LVTH244AZQNR

Name: SN74LVTH244AZQNR
Brand: Texas Instruments
SKU: SN74LVTH244AZQNR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH244AZQNR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-VFBGA

Datasheet:: SN74LVTH244AZQNR.pdf

Description:: IC BUFFER NON-INVERT 3.6V 20BGA

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Product details

Overview

SN74LVTH244AZQNR from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal operation (5-V inputs/outputs with 3.3-V V_CC). It features bus-hold on all data inputs, I_off and power-up 3-state for hot insertion, and supports unregulated battery operation down to 2.7 V. Used in industrial backplane interfaces and legacy 5-V system bridging.

For engineers reviewing the SN74LVTH244AZQNR datasheet, SN74LVTH244AZQNR pinout, SN74LVTH244AZQNR application, or SN74LVTH244AZQNR equivalent, key selection criteria include its 20-pin VFBGA (ZQN) package, ±100 µA I_off current at V_CC = 0 V, 0.55 V typical V_OL at I_OL = 64 mA, and bus-hold input stabilization eliminating external resistors.

Technical Context

The SN74LVTH244AZQNR implements two independent 4-bit noninverting buffer sections, each with dedicated output-enable (OE) control-1OE for Y1–Y4 and 2OE for Y1'–Y4'. Its ABT (Advanced BiCMOS Technology) architecture delivers TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2 V) while operating from a 2.7–3.6 V supply.

It integrates active bus-hold circuitry (±750 µA hold current at V_CC = 3.6 V) and I_off protection that disables outputs during power-down to prevent backflow. Propagation delays are specified at t_PLH/t_PHL ≤ 3.8 ns (V_CC = 3.3 V, CL = 50 pF), with enable/disable times ≤ 5.8 ns.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - supports wide-input unregulated battery rails without LDO dependency
I_OL (max)	64 mA - drives heavy capacitive loads or multiple TTL inputs directly
V_OL (typ)	0.55 V at I_OL = 64 mA - ensures robust low-level noise margin in noisy industrial environments
t_PLH/t_PHL	≤3.8 ns - enables high-speed data buffering in 25-MHz+ parallel bus applications
I_off	±100 µA at V_CC = 0 V - prevents damaging current flow during hot-swap or partial-power-down sequences
Bus-Hold Current	±750 µA - actively holds floating inputs at valid logic levels without pullup/pulldown resistors
ESD Rating	2000-V HBM - meets industrial-grade ESD immunity requirements per JESD22-A114

Pinout & Package

VFBGA-20 (ZQN) package: 3.5 mm × 4.5 mm, 0.5 mm pitch, exposed thermal pad, RoHS-compliant NiPdAu finish, MSL Level-3 (260°C peak reflow).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 6, 7, 8, 9	Data Inputs (1A1–1A4, 2A1–2A4)	Accept 5-V-tolerant TTL-level signals; bus-hold enabled by default
5, 19	Output Enables (1OE, 2OE)	Active-low controls; must be pulled up to V_CC for safe power-up 3-state behavior
11, 12, 13, 14, 16, 17, 18, 20	3-State Outputs (1Y1–1Y4, 2Y1–2Y4)	Drive 5-V buses with 3.3-V V_CC; high-Z state prevents contention during reset
10	GND	Ground reference for all I/O and internal logic; connects to PCB thermal pad
15	V_CC	3.3-V supply input; decoupling capacitor required within 1 cm of pin

Key Features

Feature	Design Value
Mixed-mode 5-V/3.3-V interface	Accepts 5-V inputs and drives 5-V loads while powered from 3.3 V - eliminates level-shifter ICs in legacy upgrades
Integrated bus-hold	Eliminates need for 10-kΩ external pullup/pulldown resistors on unused data lines - reduces BOM count and board space
Hot-insertion support	I_off + power-up 3-state prevents backdrive and bus contention when inserted into live backplanes
Low ground bounce (V_OLP)	<0.8 V at V_CC = 3.3 V - maintains signal integrity in high-speed switching with multiple outputs active
Latch-up immunity	>500 mA per JESD17 - ensures reliability in harsh electrical environments including industrial motor controls

Applications

Industrial Backplane Interface	Legacy System Bus Bridging
Use Scenario: Interfacing a 3.3-V microcontroller to a 5-V ISA-style backplane carrying address/data/control signals. IC Role / Device Role / Timing Role: Octal noninverting buffer with independent OE control isolates voltage domains and enables selective bus segment activation. Use Value: Eliminates discrete level shifters and pull resistors; supports hot-plug maintenance without system shutdown.	Use Scenario: Upgrading aging test equipment with modern 3.3-V FPGAs while retaining existing 5-V peripheral modules. IC Role / Device Role / Timing Role: Bidirectional signal conditioner translating logic levels between mismatched voltage domains on shared data bus. Use Value: Maintains full timing compatibility (≤3.8 ns propagation delay) and eliminates redesign of legacy PCB layouts.
Automated Test Equipment (ATE) Fixture	Programmable Logic Controller (PLC) I/O Module
Use Scenario: Driving multiple DUT (device-under-test) inputs simultaneously from a single FPGA I/O bank in production test handlers. IC Role / Device Role / Timing Role: High-current (64 mA) buffer ensuring fast edge rates and stable logic levels across long fixture traces. Use Value: Guarantees signal fidelity at 25 MHz+ scan rates; bus-hold prevents floating inputs during test sequence gaps.	Use Scenario: Isolating field-side 5-V sensor/actuator signals from a 3.3-V controller ASIC in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Robust interface IC with I_off protection and >500 mA latch-up immunity for industrial EMC resilience. Use Value: Survives repetitive ESD events and ground potential differences without latch-up or parametric drift.

Industrial Backplane Interface

Legacy System Bus Bridging

Use Scenario: Interfacing a 3.3-V microcontroller to a 5-V ISA-style backplane carrying address/data/control signals.

IC Role / Device Role / Timing Role: Octal noninverting buffer with independent OE control isolates voltage domains and enables selective bus segment activation.

Use Value: Eliminates discrete level shifters and pull resistors; supports hot-plug maintenance without system shutdown.

Use Scenario: Upgrading aging test equipment with modern 3.3-V FPGAs while retaining existing 5-V peripheral modules.

IC Role / Device Role / Timing Role: Bidirectional signal conditioner translating logic levels between mismatched voltage domains on shared data bus.

Use Value: Maintains full timing compatibility (≤3.8 ns propagation delay) and eliminates redesign of legacy PCB layouts.

Automated Test Equipment (ATE) Fixture

Programmable Logic Controller (PLC) I/O Module

Use Scenario: Driving multiple DUT (device-under-test) inputs simultaneously from a single FPGA I/O bank in production test handlers.

IC Role / Device Role / Timing Role: High-current (64 mA) buffer ensuring fast edge rates and stable logic levels across long fixture traces.

Use Value: Guarantees signal fidelity at 25 MHz+ scan rates; bus-hold prevents floating inputs during test sequence gaps.

Use Scenario: Isolating field-side 5-V sensor/actuator signals from a 3.3-V controller ASIC in DIN-rail mounted PLC modules.

IC Role / Device Role / Timing Role: Robust interface IC with I_off protection and >500 mA latch-up immunity for industrial EMC resilience.

Use Value: Survives repetitive ESD events and ground potential differences without latch-up or parametric drift.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC244APWR	Lower drive strength (24 mA I_OL), no bus-hold, 1.65–3.6 V V_CC	Not suitable for direct 5-V bus driving or floating-input scenarios without external resistors	Select only if interfacing strictly within 3.3-V systems and cost is primary constraint
SN74ALVC244PWR	Higher speed (t_PD ≤ 2.8 ns), 1.65–3.6 V V_CC, no I_off or bus-hold	Lacks hot-insertion and floating-input handling - requires careful power sequencing and external biasing	Prefer for high-speed 3.3-V-only designs where layout allows strict control of input states

Compared with SN74LVC244APWR and SN74ALVC244PWR, the SN74LVTH244AZQNR uniquely combines 5-V-tolerant I/O, integrated bus-hold, and I_off-enabled hot-swap capability - making it the only choice for retrofitting legacy 5-V infrastructure with modern low-voltage controllers.

Availability

SN74LVTH244AZQNR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus bridging, automated test equipment fixtures, and programmable logic controller I/O modules requiring stable component supply across extended product lifecycles.

Supply support for SN74LVTH244AZQNR 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

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74LVTH244A family was engineered specifically for mixed-voltage system integration - enabling seamless interoperability between legacy 5-V logic and emerging 3.3-V digital subsystems without external level-shifting components.

FAQ

What is the maximum operating temperature range for the SN74LVTH244AZQNR?

The SN74LVTH244AZQNR is rated for operation from −40°C to +85°C ambient temperature. This commercial-grade temperature range aligns with standard industrial electronics requirements and is validated per TI's production testing protocol for the ZQN package variant. The device's thermal resistance (θ_JA = 78°C/W) and exposed thermal pad design support reliable operation under continuous load at the upper limit.

Does the SN74LVTH244AZQNR require external pullup resistors on its OE pins?

Yes - to ensure the outputs remain in high-impedance state during power-up and power-down, both 1OE and 2OE pins must be tied to V_CC through external pullup resistors. The minimum resistor value depends on the driver's current-sinking capability; TI recommends ≥10 kΩ for typical applications. The SN74LVTH244AZQNR itself does not integrate internal OE pullups.

Can the SN74LVTH244AZQNR safely interface with 5-V microcontrollers?

Yes - the SN74LVTH244AZQNR supports mixed-mode operation: its inputs tolerate 5-V signals even when V_CC = 3.3 V, and its outputs drive 5-V logic-high levels (VOH ≥ 2 V at I_OH = −32 mA). This allows direct connection to legacy 5-V microcontrollers without external level shifters, provided the 5-V device's output low voltage remains ≤0.8 V.

What is the purpose of the exposed thermal pad on the SN74LVTH244AZQNR (ZQN) package?

The exposed thermal pad on the SN74LVTH244AZQNR serves dual mechanical and thermal functions: it enhances solder joint reliability by increasing surface area and improves heat dissipation from the die to the PCB. TI specifies that the pad must be soldered to a solid copper pour connected to GND for optimal performance. Failure to connect it may result in elevated junction temperatures and reduced long-term reliability under sustained 64-mA output loading.

How does bus-hold functionality work on the SN74LVTH244AZQNR, and when should it be disabled?

Bus-hold on the SN74LVTH244AZQNR uses internal feedback circuitry to maintain the last-valid logic state on unused or floating data inputs, drawing ±750 µA at V_CC = 3.6 V. It cannot be disabled - it is always active. TI explicitly advises against using external pullup/pulldown resistors with bus-hold enabled, as they conflict and may cause excessive current draw or metastability.

SN74LVTH244AZQNR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVTH

Package/Case:: 20-VFBGA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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:: 32mA, 64mA

Voltage - Supply:: 2.7V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-BGA MICROSTAR JUNIOR (4x3)

SN74LVTH244AZQNR FAQ

1.How can I place an order for SN74LVTH244AZQNR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH244AZQNR 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 SN74LVTH244AZQNR reliable?

The price and inventory of SN74LVTH244AZQNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH244AZQNR is usually 5 days.

3.What payment methods are accepted for SN74LVTH244AZQNR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH244AZQNR transactions.

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4.How is shipping managed for SN74LVTH244AZQNR?

SN74LVTH244AZQNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH244AZQNR 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 SN74LVTH244AZQNR?

For technical support, including SN74LVTH244AZQNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH244AZQNR requirements.

6.How does Aetrix verify that SN74LVTH244AZQNR is sourced from the original manufacturer or authorized distributors?

All SN74LVTH244AZQNR 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 SN74LVTH244AZQNR meets industry standards.

7.What is the process for return or replacement of SN74LVTH244AZQNR?

All SN74LVTH244AZQNR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH244AZQNR, 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 SN74LVTH244AZQNR part is unused and in its original packaging.

Return procedure for SN74LVTH244AZQNR:

1.Submit a request within 90 days.

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

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