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

NXP Semiconductors 74LVT640PW,112

Name: 74LVT640PW,112
Brand: NXP Semiconductors
SKU: 74LVT640PW,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVT640PW,112

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: 74LVT640PW,112.pdf

Description:: IC TRANSCEIVER 8BIT INV 20TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:1,409

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Product details

Overview

74LVT640PW,112 from Nexperia is an octal inverting 3-state transceiver with direction control (DIR) and active-low output enable (OE), operating at 3.3 V supply (2.7–3.6 V). It provides bidirectional data flow between two 8-bit buses (A0–A7 and B0–B7), supports 5 V-tolerant inputs, delivers ±32 mA/±64 mA drive capability, and features bus-hold inputs to eliminate external pull-ups - used in backplane interface, memory expansion, and mixed-voltage system interconnects.

For engineers reviewing the 74LVT640PW,112 datasheet, 74LVT640PW,112 pinout, 74LVT640PW,112 application, or 74LVT640PW,112 equivalent, key selection criteria include its 3.3 V BiCMOS logic compatibility, 5 V input tolerance, 3-state timing (tPZH ≤ 5.3 ns), bus-hold functionality, and TSSOP20 package suitability for high-density PCB layouts.

Technical Context

The 74LVT640PW implements a dual-bus, inverting transceiver architecture with independent DIR and OE controls: DIR selects data flow direction (A→B or B→A), while OE disables all outputs into high-impedance state. Its BiCMOS process enables TTL-level interfacing and 5 V input overvoltage tolerance without clamping diodes.

It incorporates IOFF circuitry for partial power-down operation and bus-hold inputs (IBHL = 75–150 μA, IBHH = −75 to −150 μA) that actively retain last-valid logic state on unused pins - eliminating need for external biasing and improving noise immunity in floating-bus scenarios.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.7 V to 3.6 V - ensures stable operation across industrial-grade 3.3 V rails with ±0.3 V margin.
Input Voltage Range	0 V to 5.5 V - allows direct connection to 5 V logic systems without level-shifting circuitry.
Output Drive	+64 mA sink / −32 mA source - supports driving heavy capacitive loads and multiple TTL inputs.
Propagation Delay	tPLH/tPHL ≤ 3.7 ns @ VCC = 3.3 V - enables reliable operation in high-speed address/data bus applications up to ~100 MHz.
Bus-Hold Current	IBHL = 75–150 μA, IBHH = −75 to −150 μA - maintains defined logic state on unconnected inputs without external resistors.
Operating Temperature	−40 °C to +85 °C - qualified for industrial ambient environments without derating.
ESD Protection	≥2000 V HBM, ≥200 V MM - meets robustness requirements for board handling and system integration.

Pinout & Package

TSSOP20 plastic thin shrink small outline package (SOT360-1), 20-pin, 4.4 mm body width, 0.65 mm pitch, lead-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1	DIR	Direction control input: HIGH enables A→B data flow; LOW enables B→A (inverting transceiver).
2	VCC	Main supply pin (2.7–3.6 V); decoupling capacitor required near this pin for noise suppression.
3–10	A0–A7	First 8-bit bidirectional data port; bus-hold enabled by default to prevent floating states.
11–18	B0–B7	Second 8-bit bidirectional data port; electrically identical to A-side with same bus-hold behavior.
19	OE	Active-low output enable: LOW enables transceiver; HIGH forces all A/B pins into high-impedance state.
20	GND	Ground reference (0 V); must be low-inductance connection to minimize switching noise.

Key Features

Feature	Design Value
5 V-tolerant inputs	Accepts 0–5.5 V signals while powered from 3.3 V - enables seamless interfacing with legacy 5 V subsystems.
IOFF partial power-down	Prevents current backflow when VCC = 0 V and I/O pins are driven - critical for live insertion/extraction.
Bus-hold inputs	Actively retains last logic state on unused A/B pins - eliminates external pull-up/pull-down resistors and saves PCB space.
Power-up 3-state	Outputs remain in high-impedance state until VCC stabilizes - prevents bus contention during power sequencing.
Latch-up immunity	Exceeds 500 mA per JESD78 Class II Level B - ensures reliability under transient overvoltage or ESD stress.

Applications

Backplane Interconnect

Memory Expansion Interface

Use Scenario: Bidirectional data transfer between CPU and peripheral cards across a shared 8-bit backplane bus.

IC Role / Device Role / Timing Role: Octal transceiver managing direction-controlled data routing with sub-4 ns propagation delay to maintain setup/hold timing margins.

Use Value: Eliminates need for discrete direction logic and level shifters while supporting hot-plug-capable bus arbitration via IOFF and OE control.

Use Scenario: Extending address/data bus between microcontroller and parallel SRAM or Flash memory modules.

IC Role / Device Role / Timing Role: Inverting buffer isolating memory bus segments with 3-state control synchronized to memory read/write strobes.

Use Value: Bus-hold inputs prevent undefined states during memory access gaps; 64 mA sink drive ensures fast SRAM write cycles.

Mixed-Voltage System Bridge

Industrial Control I/O Expansion

Use Scenario: Connecting 3.3 V FPGA I/O banks to legacy 5 V sensor/actuator interfaces in factory automation equipment.

IC Role / Device Role / Timing Role: Voltage-tolerant transceiver enabling safe signal translation without external voltage translators.

Use Value: 5.5 V input tolerance and 3.3 V core logic reduce BOM count and improve signal integrity versus discrete solutions.

Use Scenario: Adding isolated 8-bit parallel I/O to PLC main controller via DIN-rail-mounted expansion module.

IC Role / Device Role / Timing Role: Robust bus interface with latch-up immunity and extended temperature range for harsh industrial environments.

Use Value: −40 °C to +85 °C rating and 2000 V HBM ESD protection ensure long-term reliability in electrically noisy control cabinets.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC640AT20	Lower drive (±24 mA), no bus-hold, 1.65–3.6 V supply - LVC series uses CMOS only, not BiCMOS.	Not suitable for 5 V-tolerant interfaces or high-current bus loading; requires external pull-ups.	Select only if lower power and cost outweigh need for 5 V tolerance and bus-hold.
SN74LVC8T245RHLR	Non-inverting, higher drive (±32 mA), 1.65–3.6 V, integrated auto-direction sensing - no DIR pin required.	Eliminates direction-control logic but lacks bus-hold and 5 V tolerance; requires level-shifted control signals.	Prefer for compact, direction-agnostic designs where 5 V compatibility is not needed.

Compared with 74LVT640PW,112, the 74LVC640AT20 sacrifices 5 V tolerance and bus-hold for lower static power, while SN74LVC8T245RHLR trades DIR pin simplicity for automatic direction detection - making the 74LVT640PW optimal for deterministic, mixed-voltage, high-drive bus bridging.

Availability

74LVT640PW,112 is available at Aetrix Electronics and suitable for backplane interconnect, memory expansion interface, and mixed-voltage system bridge applications requiring stable component supply, long-lifecycle support, and industrial temperature compliance.

Supply support for 74LVT640PW,112 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 focused on high-volume, high-reliability logic, analog, and MOSFET components - spun off from Philips and now part of Wingtech Group.

The 74LVT family targets high-speed, 3.3 V industrial and telecom infrastructure applications requiring 5 V tolerance, robust ESD performance, and precise timing control - optimized for bus buffering and voltage-domain bridging.

FAQ

Is 74LVT640PW,112 compatible with 5 V logic systems?

Yes - its inputs tolerate up to 5.5 V regardless of VCC (2.7–3.6 V), enabling direct connection to 5 V outputs without level shifters. Outputs swing rail-to-rail within the 3.3 V domain and are not 5 V tolerant in drive mode, so external clamping or isolation is required if driving 5 V inputs.

What is the function of the DIR pin, and how does it interact with OE?

DIR controls data direction: HIGH enables A→B transfer, LOW enables B→A. OE overrides DIR - when OE is HIGH, all outputs go high-impedance regardless of DIR state. This allows independent bus isolation and direction control, essential for multi-master arbitration and hot-swap operation.

Does 74LVT640PW,112 require external pull-up resistors on unused inputs?

No - it integrates bus-hold circuitry on all A and B pins (IBHL = 75–150 μA, IBHH = −75 to −150 μA), which actively retains the last valid logic state. This eliminates external pull-ups, reduces component count, and improves noise immunity on unterminated bus lines.

Can 74LVT640PW,112 be used in hot-swap applications?

Yes - its IOFF circuitry blocks current flow when VCC = 0 V, and its power-up 3-state behavior prevents bus contention during insertion. Combined with 2000 V HBM ESD rating and live-insertion qualification, it supports safe hot-plug operation in modular backplane systems.

74LVT640PW,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: *

Package/Case:: -

Packaging:: Tube

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

74LVT640PW,112 FAQ

1.How can I place an order for 74LVT640PW,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVT640PW,112 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 74LVT640PW,112 reliable?

The price and inventory of 74LVT640PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT640PW,112 is usually 5 days.

3.What payment methods are accepted for 74LVT640PW,112?

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Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVT640PW,112?

74LVT640PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVT640PW,112 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 74LVT640PW,112?

For technical support, including 74LVT640PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT640PW,112 requirements.

6.How does Aetrix verify that 74LVT640PW,112 is sourced from the original manufacturer or authorized distributors?

All 74LVT640PW,112 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 74LVT640PW,112 meets industry standards.

7.What is the process for return or replacement of 74LVT640PW,112?

All 74LVT640PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT640PW,112, 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 74LVT640PW,112 part is unused and in its original packaging.

Return procedure for 74LVT640PW,112:

1.Submit a request within 90 days.

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

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