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

Texas Instruments SN74LVTH240ZQNR

Name: SN74LVTH240ZQNR
Brand: Texas Instruments
SKU: SN74LVTH240ZQNR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH240ZQNR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-VFBGA

Datasheet:: SN74LVTH240ZQNR.pdf

Description:: IC BUFFER INVERT 3.6V 20BGA

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Product details

Overview

SN74LVTH240ZQNR 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 backplane interface, memory address buffering, and industrial control bus isolation.

For engineers reviewing the SN74LVTH240ZQNR datasheet, SN74LVTH240ZQNR pinout, SN74LVTH240ZQNR application, or SN74LVTH240ZQNR equivalent, key selection criteria include its 20-pin VFBGA (ZQN) package, 3.3-V supply with 5-V tolerant inputs, bus-hold functionality eliminating external resistors, and guaranteed hot-insertion support via I_off and power-up 3-state.

Technical Context

This device integrates two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. The ABT logic family delivers TTL-compatible output drive while operating from a 3.3-V supply, enabling seamless interfacing between 3.3-V logic domains and legacy 5-V systems.

Bus-hold circuitry actively maintains valid logic states on unused inputs without external pullup/pulldown resistors, reducing BOM count and layout complexity. I_off protection disables outputs during power-down to prevent current backflow, and power-up 3-state ensures high-impedance outputs during supply ramp-up-critical for live system expansion.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - supports wide-input unregulated battery operation without external regulation
Input Voltage Tolerance	−0.5 V to 7 V - enables direct connection to 5-V buses without level shifters
I_OL / I_OH	64 mA / −32 mA at V_CC = 3 V - drives heavy capacitive loads or multiple TTL inputs
t_PLH/t_PHL	0.9–4.6 ns at V_CC = 3.3 V - meets timing requirements for high-speed address/data buffering
Bus-Hold Current	±750 μA at V_CC = 3.6 V - reliably sustains logic state against noise or floating conditions
ESD Protection	2000-V HBM, 200-V MM - exceeds JEDEC standards for robust handling in manufacturing and field use
Latch-Up Immunity	>500 mA per JESD 17 - prevents destructive latch-up under transient overvoltage events

Pinout & Package

VFBGA package (ZQN), 20-pin, 2.5 mm × 3.0 mm footprint, 0.5-mm pitch, bottom-side solder balls, 1.2-mm max height. Pin 1 located at top-left corner of package marking side.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 6, 7, 8, 9	Data Inputs (1A1–1A4, 2A1–2A4)	Noninverting input terminals for two 4-bit buffer sections; accept 5-V-tolerant signals
5, 19	Output Enables (1OE, 2OE)	Active-low controls for respective 4-bit sections; tied to V_CC via pullup for safe power-up
11, 12, 13, 14, 16, 17, 18, 20	Outputs (1Y1–1Y4, 2Y1–2Y4)	3-state buffered outputs with TTL-level drive strength and bus-hold disabled
10	GND	Ground reference for logic and power return path
15	V_CC	3.3-V supply input; decoupling capacitor required within 1 cm for stable switching

Key Features

Feature	Design Value
Mixed-mode voltage tolerance	5-V input/output compatibility with 3.3-V V_CC eliminates level-shifter ICs in hybrid voltage systems
Integrated bus-hold	Eliminates need for 10-kΩ external pullup/pulldown resistors on all eight data inputs
Hot-insertion support	I_off and power-up 3-state prevent backdrive damage and bus contention during live board replacement
Low ground bounce	V_OLP < 0.8 V at V_CC = 3.3 V ensures signal integrity during simultaneous output switching
Wide supply range	Operates down to 2.7 V enables direct connection to single-cell Li-ion or alkaline battery rails

Applications

Backplane Interface Buffering	Memory Address Bus Isolation
Use Scenario: Isolating CPU address lines from peripheral expansion slots in modular industrial controllers. IC Role / Device Role / Timing Role: Noninverting octal buffer providing bidirectional 5-V-tolerant signal translation between 3.3-V processor and legacy 5-V peripherals. Use Value: Prevents bus contention during hot-swap of expansion cards using I_off and power-up 3-state behavior.	Use Scenario: Driving high-capacitance memory address lines in FPGA-based embedded systems with mixed-voltage peripherals. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer ensuring setup/hold timing margins across 100+ pF trace loads. Use Value: 64-mA sink capability and sub-5-ns propagation delay maintain timing closure at 50-MHz bus rates.
Industrial I/O Module Signal Conditioning	Legacy System Voltage Translation
Use Scenario: Interfacing microcontroller GPIOs to noisy 24-V PLC input modules via optocoupler interfaces. IC Role / Device Role / Timing Role: Input-side buffer with bus-hold maintaining defined logic state during optocoupler turn-on/off transitions. Use Value: ±750-μA bus-hold current suppresses false triggering caused by slow-rising opto output edges.	Use Scenario: Upgrading 5-V legacy instrumentation front-ends with modern 3.3-V ADCs and FPGAs. IC Role / Device Role / Timing Role: Unidirectional level translator preserving TTL logic thresholds while operating from 3.3-V rail. Use Value: −0.5 V to 7 V input range accepts legacy 5-V signals without clamping diodes or external biasing.

Backplane Interface Buffering

Memory Address Bus Isolation

Use Scenario: Isolating CPU address lines from peripheral expansion slots in modular industrial controllers.

IC Role / Device Role / Timing Role: Noninverting octal buffer providing bidirectional 5-V-tolerant signal translation between 3.3-V processor and legacy 5-V peripherals.

Use Value: Prevents bus contention during hot-swap of expansion cards using I_off and power-up 3-state behavior.

Use Scenario: Driving high-capacitance memory address lines in FPGA-based embedded systems with mixed-voltage peripherals.

IC Role / Device Role / Timing Role: Low-skew, high-drive buffer ensuring setup/hold timing margins across 100+ pF trace loads.

Use Value: 64-mA sink capability and sub-5-ns propagation delay maintain timing closure at 50-MHz bus rates.

Industrial I/O Module Signal Conditioning

Legacy System Voltage Translation

Use Scenario: Interfacing microcontroller GPIOs to noisy 24-V PLC input modules via optocoupler interfaces.

IC Role / Device Role / Timing Role: Input-side buffer with bus-hold maintaining defined logic state during optocoupler turn-on/off transitions.

Use Value: ±750-μA bus-hold current suppresses false triggering caused by slow-rising opto output edges.

Use Scenario: Upgrading 5-V legacy instrumentation front-ends with modern 3.3-V ADCs and FPGAs.

IC Role / Device Role / Timing Role: Unidirectional level translator preserving TTL logic thresholds while operating from 3.3-V rail.

Use Value: −0.5 V to 7 V input range accepts legacy 5-V signals without clamping diodes or external biasing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC240APWR	Lower drive (24 mA sink), no bus-hold, 1.65–3.6 V V_CC, no I_off	Suitable only for low-noise, fully driven buses; requires external pullups if inputs float	Select when cost and power are prioritized over hot-swap robustness and floating-input immunity
SN74AHCT240PW	5-V-only supply, higher propagation delay (7 ns), no bus-hold, no I_off	Requires 5-V rail; incompatible with 3.3-V systems unless level-shifted	Select only for pure 5-V designs where ABT-family mixed-voltage capability is unnecessary

Compared with SN74LVC240APWR and SN74AHCT240PW, the SN74LVTH240ZQNR uniquely combines 5-V input tolerance, integrated bus-hold, and I_off-enabled hot insertion in a space-constrained VFBGA package-making it the sole choice for compact, mixed-voltage, field-serviceable systems.

Availability

SN74LVTH240ZQNR is available at Aetrix Electronics and suitable for industrial control backplanes, FPGA memory interfaces, and modular instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVTH240ZQNR 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 SN74LVTH240ZQNR belongs to TI's ABT logic family, engineered specifically for mixed-voltage system interfacing-enabling reliable 3.3-V core logic to communicate with legacy 5-V buses without external level-shifting components.

FAQ

What is the maximum operating temperature range for the SN74LVTH240ZQNR?

The SN74LVTH240ZQNR is rated for operation from −40°C to +85°C ambient temperature. This commercial-grade specification aligns with its intended use in industrial embedded systems and programmable logic controllers where extended thermal stability is required but military-grade extremes are not necessary. The ZQN package's thermal resistance (θ_JA = 78°C/W) supports this range under typical PCB copper pour conditions.

Does the SN74LVTH240ZQNR require external pullup resistors on its data inputs?

No, the SN74LVTH240ZQNR does not require external pullup or pulldown resistors on its data inputs due to integrated bus-hold circuitry. Each input actively maintains its last-valid logic state with ±750 μA hold current at V_CC = 3.6 V. Using external resistors with bus-hold enabled is explicitly discouraged in the datasheet as it may cause contention or excessive current draw.

Can the SN74LVTH240ZQNR be used in hot-swap applications?

Yes, the SN74LVTH240ZQNR is explicitly designed for hot-insertion applications. Its I_off circuitry disables outputs when V_CC = 0 V, preventing damaging current backflow into powered-backplane traces. Combined with power-up 3-state, it ensures outputs remain high-impedance during power ramp-up/down-eliminating bus conflicts during live module replacement.

What is the pin 1 location and orientation for the SN74LVTH240ZQNR ZQN package?

For the SN74LVTH240ZQNR in the ZQN (VFBGA) package, pin 1 is located at the top-left corner of the package marking side, identified by a small dot or chamfered corner per JEDEC MO-220 standards. The 20-ball array is arranged in a 5×4 grid (5 rows × 4 columns), with row A containing pins 1–4, row B containing pins 5–8, and so on-matching the top-view pinout diagram in the SCBS679K datasheet.

How does the SN74LVTH240ZQNR handle 5-V input signals while operating from a 3.3-V supply?

The SN74LVTH240ZQNR handles 5-V input signals safely through its specified input voltage range of −0.5 V to 7 V, independent of V_CC. Internal input clamp diodes and ABT logic design allow direct connection to 5-V buses without external protection. Input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) remain TTL-compatible, ensuring correct logic interpretation even when V_CC = 3.3 V.

SN74LVTH240ZQNR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVTH

Package/Case:: 20-VFBGA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, 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)

SN74LVTH240ZQNR FAQ

1.How can I place an order for SN74LVTH240ZQNR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH240ZQNR 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 SN74LVTH240ZQNR reliable?

The price and inventory of SN74LVTH240ZQNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH240ZQNR is usually 5 days.

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SN74LVTH240ZQNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH240ZQNR 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 SN74LVTH240ZQNR?

For technical support, including SN74LVTH240ZQNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH240ZQNR requirements.

6.How does Aetrix verify that SN74LVTH240ZQNR is sourced from the original manufacturer or authorized distributors?

All SN74LVTH240ZQNR 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 SN74LVTH240ZQNR meets industry standards.

7.What is the process for return or replacement of SN74LVTH240ZQNR?

All SN74LVTH240ZQNR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH240ZQNR, 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 SN74LVTH240ZQNR part is unused and in its original packaging.

Return procedure for SN74LVTH240ZQNR:

1.Submit a request within 90 days.

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

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