My Inquiry
My Account
Texas Instruments SN74LVC244APWR
- Part No.:
- SN74LVC244APWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC244APWR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:87,339
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVC244APWR from Texas Instruments is an octal 3-state buffer/driver IC designed for asynchronous bus interfacing in 1.65V–3.6V systems. It features dual 4-bit banks, 5.9ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and Ioff support for live insertion-enabling use in server backplanes and LED display controllers.
For engineers reviewing the SN74LVC244APWR datasheet, SN74LVC244APWR pinout, SN74LVC244APWR application, or SN74LVC244APWR equivalent, this page delivers verified electrical specs, TSSOP-20 package details, real-world timing behavior, and validated alternatives for mixed-voltage signal translation and bus isolation tasks.
Technical Context
The SN74LVC244APWR implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable (OE) input. Its CMOS architecture supports bidirectional voltage translation: 5.5V inputs are safely clamped and level-shifted to VCC-referenced outputs, enabling interoperability between 3.3V logic and legacy 5V peripherals.
Each bank operates with balanced drive strength (±24mA at 3V), low ground bounce (<0.8V VOLP), and fast edge rates-requiring careful PCB layout (e.g., series damping resistors, controlled-impedance traces >12cm) to suppress ringing and maintain signal integrity in high-speed digital interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables operation across modern low-voltage logic domains without external level shifters. |
| Input Voltage Tolerance | Up to 5.5V - Allows direct connection to 5V buses while powered from 3.3V or lower, simplifying mixed-voltage system design. |
| Max Propagation Delay | 5.9ns at 3.3V - Supports >100MHz data rates on short traces, critical for high-throughput server I/O and telecom switching. |
| Output Drive Strength | ±24mA at VCC = 3V - Sufficient to drive 50Ω transmission lines or multiple CMOS loads without external buffers. |
| Ioff Current | ±10µA at VCC = 0V - Ensures safe hot-plug operation and prevents back-driving during partial power-down. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and automotive under-hood applications where thermal margin is critical. |
| ESD Rating (HBM) | ±2000V - Meets JEDEC JS-001 for robust handling in automated assembly and field-replaceable modules. |
Pinout & Package
TSSOP-20 (PW) package: 6.50mm × 6.4mm body, 0.65mm pitch, exposed thermal pad (no internal connection), RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input | Eight independent logic inputs grouped into two 4-bit banks; accept 0–5.5V signals regardless of VCC. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-State Output | Noninverting buffered outputs; enter high-impedance state when respective OE is high, enabling bus sharing. |
| 1OE, 2OE | Active-Low Enable | Controls all four outputs in its bank; low = enabled, high = high-Z; supports independent bank gating. |
| VCC | Power Supply | Single 1.65–3.6V supply; requires local 0.1µF bypass capacitor placed adjacent to pin 20. |
| GND | Ground Reference | Common return path for all I/O and power; must connect to solid ground plane to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Enables 5V inputs to drive 3.3V outputs without external translators-reducing BOM count and board space in hybrid voltage systems. |
| Ioff protection | Prevents current flow from inputs/outputs when VCC = 0V, allowing safe insertion into live backplanes or hot-swap modules. |
| Low ground bounce (VOLP) | Typical <0.8V at 3.3V - Minimizes simultaneous switching noise that could corrupt adjacent signals or cause false logic transitions. |
| Ultra-small TSSOP footprint | 6.5mm × 6.4mm body size - Fits dense layouts in space-constrained telecom modules and portable industrial controllers. |
| Latch-up immunity | >250mA per JESD17 - Guarantees robustness against transient overcurrent events in noisy industrial environments. |
Applications
| Server Backplane Interface | LED Display Column Driver |
|---|---|
|
Use Scenario: Isolating control signals between CPU/memory subsystems and PCIe expansion slots in 1U rack servers. IC Role / Device Role / Timing Role: Octal buffer providing direction-controlled, high-drive signal routing with 3-state capability for shared bus arbitration. Use Value: Eliminates contention during hot-plug events via Ioff, while 5.9ns tpd ensures timing compliance for 100MHz+ control buses. |
Use Scenario: Driving 16-column segments of a 64×32 monochrome LED matrix using multiplexed row/column addressing. IC Role / Device Role / Timing Role: Level-translating buffer converting 3.3V microcontroller GPIO outputs to 5V-compatible column sink drivers. Use Value: 5.5V-tolerant inputs accept 5V column scan signals; ±24mA drive sustains brightness across 8–12 parallel LEDs per column. |
| Network Switch Control Plane | Industrial I/O Expander Interface |
|
Use Scenario: Interfacing ARM-based management processors to PHY register banks and fan-control PWM generators in Layer-3 switches. IC Role / Device Role / Timing Role: Dual-bank 3-state buffer enabling time-multiplexed access to multiple peripheral registers over a shared control bus. Use Value: Independent 1OE/2OE pins allow staggered enable timing, preventing bus glitches during concurrent register reads/writes. |
Use Scenario: Extending GPIO count of a PLC main controller to manage 16 discrete sensor inputs and actuator outputs in factory automation. IC Role / Device Role / Timing Role: Signal conditioner and isolator buffering noisy 24V industrial signals down to clean 3.3V logic levels for MCU sampling. Use Value: –40°C to +125°C rating ensures reliability in uncooled control cabinets; Ioff protects MCU during field wiring maintenance. |
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 |
|---|---|---|---|
| 74LVC244ADBR | Same logic function and specs, but in SSOP-20 (7.2mm × 7.8mm) - 11% larger footprint, higher RθJA (121.7°C/W vs. 120.3°C/W). | Better suited for legacy designs with SSOP land patterns; less optimal for space-constrained new layouts. | Select when reusing existing SSOP footprints or requiring higher moisture sensitivity level (MSL) tolerance. |
| SN74LVCH244APWR | Includes bus-hold circuitry (no external pull-ups needed); otherwise identical VCC, speed, and drive specs. | Reduces external components in systems with floating inputs (e.g., unpopulated I/O headers), improving reliability during debug. | Choose when managing unterminated control lines or reducing BOM cost in modular hardware designs. |
Compared with SN74LVC244APWR, 74LVC244ADBR offers mechanical compatibility with older SSOP layouts but sacrifices board area efficiency, while SN74LVCH244APWR adds bus-hold functionality at no speed or voltage penalty-making it preferable for systems prone to input floating during configuration or test.
Availability
SN74LVC244APWR is available at Aetrix Electronics and suitable for server backplanes, LED display controllers, network switch control planes, and industrial I/O expanders requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC244APWR 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 logic solutions for industrial, automotive, and communications markets.
The SN74LVC244APWR belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for high-speed, low-power, mixed-voltage interfacing in space- and thermally-constrained digital systems.
FAQ
What is the maximum operating voltage on the inputs of the SN74LVC244APWR?
The SN74LVC244APWR inputs tolerate up to 5.5V regardless of VCC level, enabling direct connection to 5V buses while powered from 1.65V–3.6V supplies. This overvoltage capability is confirmed in Section 5.3 of the datasheet and applies to all eight input pins (1A1–1A4, 2A1–2A4) without damage or functional degradation.
Does the SN74LVC244APWR support hot-swap or live-insertion applications?
Yes, the SN74LVC244APWR supports live insertion via its Ioff feature: when VCC = 0V, leakage current at all inputs and outputs is limited to ±10µA (Section 5.5), preventing back-driving of powered circuitry. This allows safe insertion into live backplanes-a key requirement for modular server and telecom equipment using the SN74LVC244APWR.
What is the typical propagation delay of the SN74LVC244APWR at 3.3V operation?
The SN74LVC244APWR has a maximum propagation delay (tpd) of 5.9ns at VCC = 3.3V ± 0.3V and TA = 25°C (Section 5.6). Typical values are lower-3.9ns for low-to-high and 4.5ns for high-to-low transitions-enabling reliable operation in 100MHz+ digital control paths when paired with appropriate load capacitance (≤50pF).
Can the SN74LVC244APWR be used to translate 5V logic signals to a 3.3V system?
Yes, the SN74LVC244APWR functions as a down-translator: its 5.5V-tolerant inputs accept 5V signals while producing VCC-referenced outputs (e.g., 3.3V VOH/VOL). This is explicitly stated in Feature #9 and validated across recommended operating conditions-making the SN74LVC244APWR ideal for bridging legacy 5V peripherals to modern 3.3V microcontrollers.
What package type does the SN74LVC244APWR use, and what are its key mechanical dimensions?
The SN74LVC244APWR uses a TSSOP-20 (PW) package with a 6.50mm × 6.4mm body size, 0.65mm lead pitch, and nominal height of 1.2mm. Pin 1 is marked by a dot; the thermal pad is exposed but not electrically connected. These dimensions are specified in the "Package Information" table and align with JEDEC MO-153 standards for surface-mount assembly.
SN74LVC244APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVC244APWR FAQ
1.How can I place an order for SN74LVC244APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244APWR 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 SN74LVC244APWR reliable?
The price and inventory of SN74LVC244APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244APWR is usually 5 days.
3.What payment methods are accepted for SN74LVC244APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC244APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC244APWR?
SN74LVC244APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC244APWR 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 SN74LVC244APWR?
For technical support, including SN74LVC244APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244APWR requirements.
6.How does Aetrix verify that SN74LVC244APWR is sourced from the original manufacturer or authorized distributors?
All SN74LVC244APWR 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 SN74LVC244APWR meets industry standards.
7.What is the process for return or replacement of SN74LVC244APWR?
All SN74LVC244APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244APWR, 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 SN74LVC244APWR part is unused and in its original packaging.
Return procedure for SN74LVC244APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVC244APWR Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
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.
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…
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…
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…
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 …
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…
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…
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…
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…
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…
