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

Nexperia USA Inc. 74LVT640D,118

Name: 74LVT640D,118
Brand: Nexperia USA Inc.
SKU: 74LVT640D,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVT640D,118

Manufacturer:: Nexperia USA Inc.

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: 74LVT640D,118.pdf

Description:: IC TRANSCEIVER INVERT 3.6V 20SO

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Product details

Overview

74LVT640D,118 from Nexperia is an octal inverting 3-state transceiver with direction control (DIR) and output enable (OE), designed for bidirectional 3.3 V bus interfacing between TTL- and 5 V-tolerant systems. It features bus-hold inputs (eliminating external pull-ups), ±32 mA/±64 mA drive capability, and operates from 2.7 V to 3.6 V across –40 °C to +85 °C.

For engineers reviewing the 74LVT640D,118 datasheet, 74LVT640D,118 pinout, 74LVT640D,118 application, or 74LVT640D,118 equivalent, this device serves as a robust level-shifting transceiver for memory expansion buses, microcontroller peripheral interconnects, and legacy 5 V system integration where signal integrity, low-power 3-state control, and live insertion are required.

Technical Context

The 74LVT640D implements BiCMOS logic architecture to achieve high-speed propagation (typ. 2.3 ns t_PLH, 2.4 ns t_PHL at V_CC = 3.3 V) while maintaining TTL-compatible input thresholds and 5.5 V overvoltage-tolerant inputs. Its IOFF circuitry enables partial power-down operation during supply ramp-up/down.

Direction control is implemented via a single DIR pin that selects data flow between two 8-bit ports (A_0–7 ↔ B_0–7); OE is active-low and forces all outputs into high-impedance state regardless of DIR. Bus-hold circuitry actively maintains last-valid logic state on unused inputs without external biasing.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.7 V to 3.6 V - ensures compatibility with 3.3 V core logic while tolerating rail variation in industrial environments
Input Voltage Range	0 V to 5.5 V - allows direct connection to 5 V buses without level shifters
Output Drive	+64 mA sink / –32 mA source - supports driving heavy capacitive loads and multiple TTL inputs
Propagation Delay	Typ. 2.3 ns (LOW→HIGH), 2.4 ns (HIGH→LOW) at 3.3 V - enables >200 MHz bus operation in short traces
Bus-Hold Current	±75 μA to ±150 μA - maintains stable logic states on floating A/B pins without external resistors
IOFF Leakage	±100 μA max at V_CC = 0 V - prevents back-driving during hot-swap or power sequencing
Operating Temperature	–40 °C to +85 °C - qualified for industrial-grade embedded control and communications equipment

Pinout & Package

74LVT640D,118 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
1 (DIR)	Direction control input	LOW enables A→B data flow; HIGH enables B→A - determines real-time bus directionality
2–9 (A0–A7)	Data port A I/O	Inverting bidirectional data lines with bus-hold - used for microcontroller-side interface
10 (GND)	Ground reference	0 V return path for all internal logic and I/O - must be low-inductance for noise immunity
11–18 (B7–B0)	Data port B I/O	Inverting bidirectional data lines with bus-hold - connects to memory/peripheral side (5 V tolerant)
19 (OE)	Active-low output enable	Drives all A/B outputs to high-Z when HIGH - enables multi-drop bus arbitration
20 (V_CC)	Positive supply	3.3 V nominal supply with 2.7–3.6 V operating range - requires local 100 nF decoupling

Key Features

Feature	Design Value
BiCMOS process technology	Combines bipolar speed and CMOS low static power - achieves sub-3 ns propagation with <0.2 mA ICC at standby
5.5 V overvoltage-tolerant inputs	Accepts 5 V signals directly on all A/B pins - eliminates external level translators in mixed-voltage systems
Live insertion/extraction support	IOFF and power-up 3-state behavior prevent bus contention during hot-swap - critical for modular backplane designs
Bus-hold on all data inputs	Eliminates need for 10 kΩ pull-up/pull-down resistors on unused A/B pins - reduces BOM count and board space
Latch-up immunity	Exceeds 500 mA per JESD78 Class II Level B - ensures robustness against transient faults in noisy industrial environments

Applications

Memory Expansion Interface

Microcontroller Peripheral Bus

Use Scenario: Interfacing a 3.3 V ARM Cortex-M7 MCU with legacy 5 V SRAM or EPROM modules on a shared address/data bus.

IC Role / Device Role / Timing Role: Bidirectional inverting transceiver managing data flow direction and isolating voltage domains during read/write cycles.

Use Value: Enables direct 5 V memory access without level shifters while maintaining sub-3 ns timing margin for 100 MHz bus clocks.

Use Scenario: Connecting multiple 5 V I/O expanders (e.g., PCA9555) to a 3.3 V host controller via shared I²C-compatible parallel bus.

IC Role / Device Role / Timing Role: Voltage-tolerant bus buffer providing direction control and 3-state isolation between master and slave peripherals.

Use Value: Prevents bus contention during reset sequences and supports hot-plug configuration of add-on modules.

Industrial Backplane Interconnect

Legacy System Upgrade Bridge

Use Scenario: Integrating new 3.3 V FPGA-based modules into an existing 5 V VMEbus or CompactPCI chassis.

IC Role / Device Role / Timing Role: High-drive bidirectional transceiver handling address/data strobes with live-insertion-safe IOFF behavior.

Use Value: Delivers ±64 mA drive to meet VME spec loading requirements while enabling safe module replacement under power.

Use Scenario: Retrofitting a 5 V PLC CPU board with modern 3.3 V communication ICs (e.g., RS-485 transceivers) without redesigning the entire backplane.

IC Role / Device Role / Timing Role: Inverting level-shifting transceiver translating control signals and status flags between voltage domains.

Use Value: Maintains functional equivalence of original 5 V logic levels while reducing power consumption by 40% versus discrete resistor-divider solutions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC245APWR	Non-inverting logic; lower drive (±24 mA); no bus-hold; 1.65–3.6 V supply	Requires external pull-ups; unsuitable for floating-bus scenarios without added components	Select only if non-inverting polarity is required and bus-hold is unnecessary
74ALVT164245MTD	16-bit (dual-octal); higher drive (±64 mA); same 2.7–3.6 V range; includes bus-hold	Pinout incompatible; larger TSSOP-48 package; intended for wider data paths	Choose for 16-bit parallel interfaces where footprint and cost allow

Compared with SN74LVC245APWR and 74ALVT164245MTD, the 74LVT640D,118 uniquely combines inverting logic, integrated bus-hold, 5.5 V input tolerance, and SO20 packaging - making it optimal for space-constrained 8-bit upgrades requiring zero external biasing and guaranteed signal stability on unterminated lines.

Availability

74LVT640D,118 is available at Aetrix Electronics and suitable for industrial automation controllers, embedded communication gateways, and legacy system upgrade projects requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 74LVT640D,118 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 delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume industrial and consumer applications.

The 74LVT family targets high-speed 3.3 V bus interface applications with emphasis on mixed-voltage interoperability, live insertion, and low-power 3-state control - specifically engineered for embedded system upgrades and modular backplane architectures.

FAQ

What is the maximum clock frequency supported by the 74LVT640D,118 in a typical bus configuration?

The 74LVT640D,118 has a typical propagation delay of 2.3 ns (t_PLH) and 2.4 ns (t_PHL) at V_CC = 3.3 V, supporting reliable operation up to 200 MHz in point-to-point configurations with controlled trace impedance and ≤50 pF load. For multi-drop buses, derating to 100 MHz is recommended to maintain setup/hold margins.

Does the 74LVT640D,118 require external pull-up resistors on unused A/B pins?

No. The device integrates bus-hold circuitry on all A_0–7 and B_0–7 pins, providing ±75 μA to ±150 μA holding current to maintain the last-valid logic state. This eliminates the need for external pull-up or pull-down resistors on unconnected data lines.

Can the 74LVT640D,118 safely interface with a 5 V microcontroller's GPIO pins?

Yes - all A/B input pins tolerate up to 5.5 V regardless of V_CC level, and outputs drive to valid 3.3 V logic levels compatible with 5 V-tolerant inputs. However, outputs should not be directly connected to 5 V-powered loads without series resistance or clamping, as VOH is limited to ~2.2 V at –32 mA.

Is the 74LVT640D,118 pin-compatible with the 74LVT640PW variant?

Yes - both share identical pin functions and electrical specifications. The 74LVT640D,118 (SO20/SOT163-1) and 74LVT640PW (TSSOP20/SOT360-1) differ only in package dimensions and thermal characteristics; PCB layout must accommodate 7.5 mm vs. 4.4 mm body width and 1.27 mm vs. 0.65 mm lead pitch.

74LVT640D,118 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: 74LVT

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Logic Type:: Transceiver, Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

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-SO

74LVT640D,118 FAQ

1.How can I place an order for 74LVT640D,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVT640D,118 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 74LVT640D,118 reliable?

The price and inventory of 74LVT640D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT640D,118 is usually 5 days.

3.What payment methods are accepted for 74LVT640D,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT640D,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVT640D,118?

74LVT640D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVT640D,118 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 74LVT640D,118?

For technical support, including 74LVT640D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT640D,118 requirements.

6.How does Aetrix verify that 74LVT640D,118 is sourced from the original manufacturer or authorized distributors?

All 74LVT640D,118 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 74LVT640D,118 meets industry standards.

7.What is the process for return or replacement of 74LVT640D,118?

All 74LVT640D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT640D,118, 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 74LVT640D,118 part is unused and in its original packaging.

Return procedure for 74LVT640D,118:

1.Submit a request within 90 days.

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

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