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

Texas Instruments SN74LVT244BPWE4

Name: SN74LVT244BPWE4
Brand: Texas Instruments
SKU: SN74LVT244BPWE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVT244BPWE4

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74LVT244BPWE4.pdf

Description:: IC BUF NON-INVERT 3.6V 20TSSOP

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Product details

Overview

SN74LVT244BPWE4 from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal operation between 5-V inputs and 3.3-V V_CC. It features two independent 4-bit channels, I_off support for hot insertion, 2.7–3.6-V supply range, and <0.8-V output ground bounce at 3.3 V. It is used in bus interface circuits between legacy 5-V logic and modern low-voltage systems.

For engineers reviewing the SN74LVT244BPWE4 datasheet, SN74LVT244BPWE4 pinout, SN74LVT244BPWE4 application, or SN74LVT244BPWE4 equivalent, key selection criteria include 3-state control timing (t_PZH/t_PZL ≤ 5.3 ns), hot-swap capability via I_off, TTL-compatible input thresholds, and TSSOP-20 package thermal performance (θ_JA = 83°C/W).

Technical Context

This device implements dual 4-bit noninverting buffers with separate active-low output-enable (OE) controls per group. Each channel passes A→Y when OE is low; outputs enter high-impedance state when OE is high. The ABT (Advanced BiCMOS Technology) architecture enables TTL-level input recognition while operating from a 3.3-V supply.

It supports unregulated battery operation down to 2.7 V and includes power-up 3-state circuitry to prevent bus contention during power sequencing. Latch-up immunity exceeds 100 mA per JESD 78 Class II, and ESD protection meets 2000-V HBM, 200-V MM, and 1000-V CDM standards.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - supports wide-input battery rails and tolerates supply droop without functional loss.
I_OL / I_OH	64 mA sink / −32 mA source - drives standard TTL loads and sustains robust fan-out in backplane or board-level buses.
t_PLH/t_PHL	1.1–3.5 ns at V_CC = 3.3 V - ensures sub-4-ns propagation for high-speed address/data buffering in 100-MHz-class systems.
t_PZH/t_PZL	1.1–5.3 ns at V_CC = 3.3 V - guarantees fast 3-state enable/disable for dynamic bus sharing and multiplexing.
V_IL/V_IH	0.8 V / 2.0 V - accepts standard TTL input levels directly, eliminating level-shifter components in mixed-voltage designs.
I_off	±100 μA at V_CC = 0 - blocks damaging backflow current during hot-plug events, enabling safe field-replaceable module insertion.
θ_JA	83°C/W (TSSOP-PW) - defines thermal derating limit for continuous operation at ambient up to 85°C with typical PCB copper.

Pinout & Package

TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 1.2 mm max height, 0.65 mm lead pitch, exposed pad optional (not electrically connected in this variant). Pin 1 index located at top-left corner with beveled edge marking.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Active-low output-enable control	Independent gating of each 4-bit channel; must be pulled high via resistor during power-up to ensure Hi-Z default state.
1A1–1A4, 2A1–2A4	Data inputs	Noninverting inputs for respective output groups; accept 0–5.5 V signals with clamp diodes enabled.
1Y1–1Y4, 2Y1–2Y4	3-state buffered outputs	Drive external loads only when OE is low; high-impedance otherwise - enables shared-bus arbitration.
V_CC	Power supply	3.3-V nominal supply; supports down to 2.7 V for brownout tolerance in portable applications.
GND	Ground reference	Common return path for all I/O and internal logic; requires low-inductance connection to minimize ground bounce (V_OLP < 0.8 V).

Key Features

Feature	Design Value
Mixed-mode 5-V/3.3-V interfacing	Accepts 5-V TTL inputs while powered from 3.3-V rail - eliminates discrete level shifters in legacy-to-modern system upgrades.
I_off and power-up 3-state	Prevents current backflow and bus conflicts during hot insertion or partial power cycling - critical for modular computing and telecom line cards.
Low output ground bounce	V_OLP < 0.8 V at 3.3 V/25°C - reduces noise coupling into adjacent signal lines and improves signal integrity on dense PCBs.
Latch-up immunity >100 mA	Meets JESD 78 Class II - ensures robust operation under transient overvoltage or ESD-induced latch-up conditions.
ESD protection per JESD 22	2000-V HBM, 200-V MM, 1000-V CDM - reduces need for external TVS protection in industrial control and instrumentation interfaces.

Applications

PCI Bus Interface	Memory Module Adapter
Use Scenario: Interfacing 5-V PCI slot signals to a 3.3-V FPGA-based controller in embedded computing platforms. IC Role / Device Role / Timing Role: Bidirectional buffer isolating legacy PCI address/data lines while maintaining timing compliance under 33-MHz operation. Use Value: Eliminates external level translators and reduces BOM count by leveraging native 5-V-tolerant inputs and 3.3-V drive strength.	Use Scenario: Adapting DDR SDRAM modules with 5-V presence-detect lines to a 3.3-V memory controller ASIC. IC Role / Device Role / Timing Role: Level-shifting and buffering SPD EEPROM communication and module identification signals. Use Value: Ensures reliable detection and configuration of memory modules across voltage domains without signal degradation.
Hot-Swappable Backplane	Industrial I/O Expansion Card
Use Scenario: Enabling live insertion/removal of daughter cards in telecom or test equipment backplanes. IC Role / Device Role / Timing Role: Isolating card-local data buses from the main backplane using controlled 3-state enable timing. Use Value: Prevents bus contention and power surges during hot-swap via I_off and power-up 3-state behavior.	Use Scenario: Buffering digital I/O lines between a 3.3-V microcontroller and 5-V industrial sensors/actuators. IC Role / Device Role / Timing Role: Signal conditioning and voltage-domain bridging for discrete input monitoring and relay control outputs. Use Value: Simplifies firmware design by removing software-managed level translation and improves noise immunity via strong drive capability.

PCI Bus Interface

Memory Module Adapter

Use Scenario: Interfacing 5-V PCI slot signals to a 3.3-V FPGA-based controller in embedded computing platforms.

IC Role / Device Role / Timing Role: Bidirectional buffer isolating legacy PCI address/data lines while maintaining timing compliance under 33-MHz operation.

Use Value: Eliminates external level translators and reduces BOM count by leveraging native 5-V-tolerant inputs and 3.3-V drive strength.

Use Scenario: Adapting DDR SDRAM modules with 5-V presence-detect lines to a 3.3-V memory controller ASIC.

IC Role / Device Role / Timing Role: Level-shifting and buffering SPD EEPROM communication and module identification signals.

Use Value: Ensures reliable detection and configuration of memory modules across voltage domains without signal degradation.

Hot-Swappable Backplane

Industrial I/O Expansion Card

Use Scenario: Enabling live insertion/removal of daughter cards in telecom or test equipment backplanes.

IC Role / Device Role / Timing Role: Isolating card-local data buses from the main backplane using controlled 3-state enable timing.

Use Value: Prevents bus contention and power surges during hot-swap via I_off and power-up 3-state behavior.

Use Scenario: Buffering digital I/O lines between a 3.3-V microcontroller and 5-V industrial sensors/actuators.

IC Role / Device Role / Timing Role: Signal conditioning and voltage-domain bridging for discrete input monitoring and relay control outputs.

Use Value: Simplifies firmware design by removing software-managed level translation and improves noise immunity via strong drive capability.

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 (24 mA I_OL), no I_off, 1.65–3.6-V V_CC	Not suitable for hot-swap or 5-V-tolerant input scenarios requiring backflow blocking.	Select SN74LVT244BPWE4 when 5-V input compatibility, hot-insertion, or higher drive strength is required.
74ALVC244MTCX	3.3-V only, no 5-V input tolerance, 24 mA I_OL, no I_off	Requires external level shifters for 5-V interface; lacks hot-swap safety features.	Choose SN74LVT244BPWE4 for direct TTL interfacing and field-serviceable system architectures.

Compared with SN74LVC244APWR and 74ALVC244MTCX, the SN74LVT244BPWE4 uniquely delivers 5-V-tolerant inputs, 64-mA drive, and I_off-enabled hot-swap capability - making it the only option among the three qualified for legacy bus upgrades and modular hardware maintenance.

Availability

SN74LVT244BPWE4 is available at Aetrix Electronics and suitable for PCI interface design, memory module adaptation, hot-swappable backplane development, and industrial I/O expansion requiring stable component supply and long-term manufacturability.

Supply support for SN74LVT244BPWE4 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 SN74LVT244B series belongs to TI's ABT logic family, engineered for high-speed, mixed-voltage bus interfacing in systems transitioning from 5-V to 3.3-V logic domains.

FAQ

What is the maximum input voltage rating for SN74LVT244BPWE4?

The SN74LVT244BPWE4 supports an input voltage range of −0.5 V to 7 V, enabling direct connection to 5-V TTL signals without external clamping. This specification is verified per absolute maximum ratings in the TI SCAS354J datasheet, and applies regardless of V_CC level within its 2.7–3.6-V operating range.

Does SN74LVT244BPWE4 support hot insertion?

Yes, SN74LVT244BPWE4 supports hot insertion via integrated I_off circuitry and power-up 3-state functionality. When V_CC = 0, I_off limits current flow to ±100 μA, preventing backdrive damage. During power ramp-up, outputs remain in high-impedance until V_CC stabilizes - both features are explicitly documented in the SCAS354J datasheet.

What is the thermal resistance (θ_JA) of SN74LVT244BPWE4 in its TSSOP package?

The SN74LVT244BPWE4 in TSSOP-20 (PW) package has a junction-to-ambient thermal resistance (θ_JA) of 83°C/W, measured per JESD 51-7 on a standard JEDEC high-K test board. This value assumes no thermal pad soldering; adding a thermal pad can reduce θ_JA by ~15–20°C/W depending on PCB layout.

Can SN74LVT244BPWE4 drive standard TTL loads?

Yes, SN74LVT244BPWE4 can drive standard TTL loads: its I_OL = 64 mA and I_OH = −32 mA exceed the −1.6 mA/16 mA requirements of LS-TTL. Additionally, its V_IL = 0.8 V and V_IH = 2.0 V align with TTL thresholds, allowing direct interconnection without level-shifting circuitry.

Is SN74LVT244BPWE4 pin-compatible with other packages in the SN74LVT244B family?

Yes, SN74LVT244BPWE4 shares identical pinout and function with all SN74LVT244B variants (e.g., DB, DW, NS, RGY), including matching 1OE/2OE control, A/Y signal mapping, and V_CC/GND placement. This uniformity allows drop-in replacement across SOIC, SSOP, TSSOP, and QFN packages - confirmed by TI's SCAS354J pin assignment diagrams and ordering tables.

SN74LVT244BPWE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVT

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

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-TSSOP

SN74LVT244BPWE4 FAQ

1.How can I place an order for SN74LVT244BPWE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVT244BPWE4 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 SN74LVT244BPWE4 reliable?

The price and inventory of SN74LVT244BPWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT244BPWE4 is usually 5 days.

3.What payment methods are accepted for SN74LVT244BPWE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVT244BPWE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVT244BPWE4?

SN74LVT244BPWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVT244BPWE4 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 SN74LVT244BPWE4?

For technical support, including SN74LVT244BPWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT244BPWE4 requirements.

6.How does Aetrix verify that SN74LVT244BPWE4 is sourced from the original manufacturer or authorized distributors?

All SN74LVT244BPWE4 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 SN74LVT244BPWE4 meets industry standards.

7.What is the process for return or replacement of SN74LVT244BPWE4?

All SN74LVT244BPWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT244BPWE4, 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 SN74LVT244BPWE4 part is unused and in its original packaging.

Return procedure for SN74LVT244BPWE4:

1.Submit a request within 90 days.

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

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