Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Texas Instruments SN74ALVCH244NSR

Name: SN74ALVCH244NSR
Brand: Texas Instruments
SKU: SN74ALVCH244NSR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SN74ALVCH244NSR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: SN74ALVCH244NSR.pdf

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

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,173

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SN74ALVCH244NSR from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It features two independent 4-bit channels, bus-hold circuitry on all data inputs, ±24-mA output drive at 3.3 V, and a maximum propagation delay of 2.8 ns - enabling reliable signal buffering in low-voltage digital buses such as memory address/data lines or microcontroller I/O expansion.

For engineers reviewing the SN74ALVCH244NSR datasheet, SN74ALVCH244NSR pinout, SN74ALVCH244NSR application, or SN74ALVCH244NSR equivalent, key selection criteria include its dual 4-bit 3-state architecture, bus-hold input stabilization (eliminating external resistors), 20-pin TSSOP package, and compatibility with mixed-voltage system interfacing across 1.65–3.6 V domains.

Technical Context

The SN74ALVCH244NSR implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable (OE) input. Its bus-hold circuitry actively maintains valid logic states on undriven A-inputs without external pullup/pulldown resistors - reducing BOM count and layout complexity.

Each channel supports high-speed operation up to 3.6 V with guaranteed t_pd ≤ 2.8 ns at 3.3 V and robust ±24-mA drive capability. The device meets JESD 17 latch-up immunity (>250 mA) and exceeds JESD 22 ESD ratings (2000-V HBM, 200-V MM), making it suitable for industrial and embedded environments with transient noise exposure.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 3.6 V - enables interoperability between 1.8-V, 2.5-V, and 3.3-V logic domains without level shifters.
t_pd Max	2.8 ns at 3.3 V - ensures sub-3-ns signal propagation for high-throughput data path buffering.
I_OH/I_OL	±24 mA at 3 V - drives heavy capacitive loads or multiple CMOS inputs without signal degradation.
Bus-Hold Current	±45 µA at 2.3 V - actively holds floating inputs at valid logic levels, eliminating need for external biasing.
Input Voltage Range	−0.5 V to V_CC + 0.5 V - supports hot-insertion and overvoltage-tolerant input handling.
θ_JA	60 °C/W (NS package) - enables thermal management in compact PCB layouts with moderate airflow.
Operating Temp	−40°C to +85°C - qualified for industrial temperature range operation without derating.

Pinout & Package

SN74ALVCH244NSR is housed in a 20-pin TSSOP (PW) package, 6.5 mm × 4.4 mm footprint, 1.2 mm max height, with 0.65 mm lead pitch and exposed pad not present. Pin 1 is located at top-left corner with index area marking.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Output-enable control inputs	Active-low enables respective 4-bit buffer group; tie to V_CC via pullup for power-up high-Z safety.
1A1–1A4, 2A1–2A4	Data inputs	Eight buffered input signals, each with integrated bus-hold to prevent floating states.
1Y1–1Y4, 2Y1–2Y4	3-state outputs	Eight noninverting outputs; high-impedance when OE = high, driven low/high when OE = low.
V_CC	Power supply	Single 1.65–3.6 V supply; decoupling capacitor required near pin for noise suppression.
GND	Ground reference	Dedicated ground pin (Pin 10); must be connected to low-impedance system ground plane.

Key Features

Feature	Design Value
Bus-hold circuitry	Eliminates external pullup/pulldown resistors on all eight A-inputs, reducing component count and board space.
Wide V_CC range	Operates from 1.65 V to 3.6 V, supporting direct interface between 1.8-V FPGAs and 3.3-V peripherals.
High-output drive	±24-mA drive strength at 3 V allows fanout to ≥10 LVTTL loads or driving 50-pF traces at >100 MHz.
Low propagation delay	2.8 ns max t_pd at 3.3 V enables use in timing-critical applications like memory address latching or clock distribution buffers.
ESD & latch-up robustness	2000-V HBM / 200-V MM ESD rating and >250-mA JESD 17 latch-up immunity ensure reliability in manufacturing and field environments.

Applications

Memory Interface Buffering	Microcontroller I/O Expansion
Use Scenario: Isolating and driving address/data lines between a 3.3-V microcontroller and 1.8-V SRAM or flash memory. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing voltage-level compatible signal translation and load isolation. Use Value: Enables mixed-voltage memory access without discrete level shifters while maintaining <2.8-ns timing integrity.	Use Scenario: Expanding GPIO count on an ARM Cortex-M4 MCU with limited native I/O pins. IC Role / Device Role / Timing Role: Octal buffer with independent OE controls acting as programmable I/O port extender. Use Value: Adds eight bidirectional, bus-hold-protected I/O lines with minimal firmware overhead and no external bias components.
Industrial Bus Signal Conditioning	FPGA Configuration Interface
Use Scenario: Driving long PCB traces carrying parallel control signals in PLC backplane modules. IC Role / Device Role / Timing Role: High-drive buffer mitigating capacitive loading and signal integrity loss on 10+ cm traces. Use Value: ±24-mA output current sustains clean edges across 50-pF loads, reducing jitter and setup/hold violations.	Use Scenario: Buffering configuration data lines (e.g., CCLK, DIN) between FPGA and external SPI flash during boot. IC Role / Device Role / Timing Role: 3-state driver isolating flash I/O from FPGA pins during reconfiguration or sleep modes. Use Value: Prevents contention during partial reconfiguration and eliminates need for external tri-state logic or resistors.

Memory Interface Buffering

Microcontroller I/O Expansion

Use Scenario: Isolating and driving address/data lines between a 3.3-V microcontroller and 1.8-V SRAM or flash memory.

IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing voltage-level compatible signal translation and load isolation.

Use Value: Enables mixed-voltage memory access without discrete level shifters while maintaining <2.8-ns timing integrity.

Use Scenario: Expanding GPIO count on an ARM Cortex-M4 MCU with limited native I/O pins.

IC Role / Device Role / Timing Role: Octal buffer with independent OE controls acting as programmable I/O port extender.

Use Value: Adds eight bidirectional, bus-hold-protected I/O lines with minimal firmware overhead and no external bias components.

Industrial Bus Signal Conditioning

FPGA Configuration Interface

Use Scenario: Driving long PCB traces carrying parallel control signals in PLC backplane modules.

IC Role / Device Role / Timing Role: High-drive buffer mitigating capacitive loading and signal integrity loss on 10+ cm traces.

Use Value: ±24-mA output current sustains clean edges across 50-pF loads, reducing jitter and setup/hold violations.

Use Scenario: Buffering configuration data lines (e.g., CCLK, DIN) between FPGA and external SPI flash during boot.

IC Role / Device Role / Timing Role: 3-state driver isolating flash I/O from FPGA pins during reconfiguration or sleep modes.

Use Value: Prevents contention during partial reconfiguration and eliminates need for external tri-state logic or resistors.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC244APWR	Lower drive (±24 mA only at 3.3 V; drops to ±12 mA at 2.5 V), no bus-hold, identical 20-pin TSSOP package.	Requires external pullups for unused inputs; less robust in noisy or floating-input scenarios.	Select when cost sensitivity outweighs bus-hold requirement and system operates strictly at 3.3 V.
74AVCH244TTR	Same bus-hold and V_CC range, but rated for −40°C to +125°C and offered in 20-pin TSSOP with different marking (74AVCH244).	Suitable for automotive under-hood applications where extended temperature tolerance is mandatory.	Choose for AEC-Q100-compliant designs requiring wider thermal margin beyond industrial grade.

Compared with SN74ALVCH244NSR, SN74LVC244APWR lacks bus-hold and offers reduced drive below 3.3 V, while 74AVCH244TTR extends temperature range to +125°C but shares identical functional behavior and pinout - making it a drop-in upgrade for harsh-environment deployments.

Availability

SN74ALVCH244NSR is available at Aetrix Electronics and suitable for industrial control systems, FPGA configuration interfaces, and low-voltage memory subsystems requiring stable component supply, consistent parametric performance, and long-term manufacturability assurance.

Supply support for SN74ALVCH244NSR 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 specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in logic IC design and industrial-grade qualification.

The SN74ALVCH244NSR belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for high-speed, low-power, mixed-voltage interfacing in space-constrained industrial and communications equipment.

FAQ

What is the recommended power supply decoupling for SN74ALVCH244NSR?

A 0.1-µF ceramic capacitor placed within 3 mm of the V_CC pin (Pin 20) and GND (Pin 10) is required for stable operation. For systems with high-frequency switching noise, add a 4.7-µF bulk capacitor nearby. This prevents supply droop during simultaneous output transitions and ensures consistent t_pd and noise immunity in the SN74ALVCH244NSR.

Does SN74ALVCH244NSR support hot-swap or live-insertion?

Yes - the SN74ALVCH244NSR supports hot-swap operation due to its −0.5 V to V_CC + 0.5 V input voltage rating and bus-hold circuitry. However, OE pins must be held high (via pullup) before V_CC ramps to ensure outputs remain in high-impedance state during power-up, preventing bus contention in the SN74ALVCH244NSR.

Can SN74ALVCH244NSR drive 50-Ω transmission lines directly?

No - the SN74ALVCH244NSR is not designed as a line driver for 50-Ω impedance matching. Its ±24-mA drive targets CMOS/TTL loads, not RF transmission lines. For 50-Ω traces, use a dedicated line driver (e.g., SN65LVDS1) or add series termination. Relying on SN74ALVCH244NSR alone risks overshoot, ringing, and timing violations.

How does bus-hold functionality affect input leakage in SN74ALVCH244NSR?

Bus-hold adds ±45 µA (at 2.3 V) holding current to each A-input, which is intentional and specified in the datasheet. This current is not leakage but active clamping - it ensures stable logic levels without external resistors. Total quiescent current remains low (<10 µA ICC), so SN74ALVCH244NSR power impact is negligible in standby mode.

Is SN74ALVCH244NSR pin-compatible with older SN74LVCH244 variants?

Yes - SN74ALVCH244NSR shares identical pinout, function table, and package dimensions with SN74LVCH244 and SN74LVC244 devices in TSSOP-20 (PW). However, ALVCH offers improved speed (2.8 ns vs. 3.9 ns) and stronger drive (±24 mA vs. ±24 mA at 3.3 V, but better at lower V_CC), making SN74ALVCH244NSR a performance-enhanced drop-in replacement.

SN74ALVCH244NSR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ALVCH

Package/Case:: 20-SOIC (0.209", 5.30mm Width)

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:: 24mA, 24mA

Voltage - Supply:: 1.65V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

SN74ALVCH244NSR FAQ

1.How can I place an order for SN74ALVCH244NSR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ALVCH244NSR 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 SN74ALVCH244NSR reliable?

The price and inventory of SN74ALVCH244NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH244NSR is usually 5 days.

3.What payment methods are accepted for SN74ALVCH244NSR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH244NSR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ALVCH244NSR?

SN74ALVCH244NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ALVCH244NSR 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 SN74ALVCH244NSR?

For technical support, including SN74ALVCH244NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH244NSR requirements.

6.How does Aetrix verify that SN74ALVCH244NSR is sourced from the original manufacturer or authorized distributors?

All SN74ALVCH244NSR 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 SN74ALVCH244NSR meets industry standards.

7.What is the process for return or replacement of SN74ALVCH244NSR?

All SN74ALVCH244NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH244NSR, 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 SN74ALVCH244NSR part is unused and in its original packaging.

Return procedure for SN74ALVCH244NSR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…