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Texas Instruments SN74LVC244APWRG4
- Part No.:
- SN74LVC244APWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC244APWRG4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,056
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Product details
Overview
SN74LVC244APWRG4 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-used in server backplanes and LED display column drivers.
For engineers reviewing the SN74LVC244APWRG4 datasheet, SN74LVC244APWRG4 pinout, SN74LVC244APWRG4 application, or SN74LVC244APWRG4 equivalent, this page delivers verified electrical specs, TSSOP-20 package details, real-world timing behavior, and validated alternative options for industrial and telecom signal buffering.
Technical Context
The SN74LVC244APWRG4 implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable (OE) input. Its CMOS architecture supports mixed-mode signaling: 5.5V inputs are safely translated down to VCC-level outputs without level-shifting circuitry.
Each bank operates with balanced drive strength (±24mA at 3.0V), exhibits low ground bounce (<0.8V VOLP) and undershoot (>2V VOHV), and enters high-impedance state when OE is high-enabling bus sharing and hot-swap capability via Ioff protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables direct integration into 1.8V/2.5V/3.3V logic domains without external regulators. |
| Input Voltage Tolerance | Up to 5.5V - Allows connection to legacy 5V peripherals without external clamping or translation. |
| Max Propagation Delay | 5.9ns at 3.3V - Supports >100MHz data rates on short PCB traces with minimal skew between channels. |
| Output Drive Strength | ±24mA at 3.0V - Sustains robust signal integrity driving 50pF loads across 12cm traces per TI layout guidelines. |
| Operating Temperature | –40°C to +125°C - Qualified for under-hood automotive modules and industrial motor driver control boards. |
| Ioff Current | ±10µA at 5.5V - Prevents back-driving and leakage during partial power-down, enabling safe live insertion. |
| ESD Rating | ±2000V HBM - Meets JEDEC JS-001 for handling in standard assembly environments without special ESD controls. |
Pinout & Package
TSSOP-20 (PW) package: 6.50mm × 6.4mm body, 0.65mm pitch, exposed thermal pad (non-electrical), RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input (8 total) | CMOS-compatible digital inputs; accept 0–5.5V regardless of VCC; require termination to VCC/GND if unused. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-State Output (8 total) | Noninverting buffered outputs; enter high-Z when corresponding OE is high; drive ±24mA at 3V. |
| 1OE, 2OE | Active-Low Enable (2) | Independent bank control: low = enabled (buffer active), high = disabled (high-impedance output). |
| VCC | Power Supply | 1.65–3.6V core supply; requires local 0.1µF bypass capacitor placed adjacent to pin 20. |
| GND | Ground Reference | Common return path for all signals and power; must connect to solid ground plane beneath thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface | 5.5V-tolerant inputs enable direct connection to 5V controllers while operating from 3.3V VCC-no external level shifters needed. |
| Live-insertion support | Ioff circuitry disables all outputs when VCC = 0V, preventing back-drive damage during hot-plug operations in modular systems. |
| Low-noise switching | Typical VOLP < 0.8V and VOHV > 2V at 3.3V reduce ground bounce and signal undershoot, improving signal integrity on shared buses. |
| Ultra-fast propagation | 5.9ns tpd at 3.3V enables reliable operation in high-speed address/data latching applications up to 100MHz clock domains. |
| Thermal efficiency | RθJA = 120.3°C/W (TSSOP) allows sustained 500mW operation up to +125°C ambient-validated for fanless industrial enclosures. |
Applications
| Server Backplane Buffering | LED Display Column Driver |
|---|---|
|
Use Scenario: Isolating CPU memory bus from expansion slot logic in rack-mounted servers. IC Role / Device Role / Timing Role: Octal buffer providing bidirectional signal isolation and drive boost for 12cm trace lengths. Use Value: Eliminates need for discrete pull-ups and reduces signal reflections via matched 24mA drive strength. |
Use Scenario: Driving 8 parallel LED column lines in outdoor signage with 16×32 pixel matrices. IC Role / Device Role / Timing Role: Noninverting current sink/source buffer enabling simultaneous column activation with tight timing alignment. Use Value: Delivers consistent 24mA per channel at 3.3V, ensuring uniform LED brightness without external transistors. |
| Network Switch ASIC Interface | Industrial I/O Expander |
|
Use Scenario: Interfacing 10G Ethernet PHY registers to management microcontroller over shared I²C/SPI bus. IC Role / Device Role / Timing Role: 3-state bus buffer enabling time-multiplexed access to multiple PHY configuration ports. Use Value: Dual OE pins allow independent arbitration of two PHY banks, reducing firmware complexity vs. single-bank alternatives. |
Use Scenario: Extending GPIO count on PLC mainboard for sensor/actuator control in factory automation cabinets. IC Role / Device Role / Timing Role: General-purpose digital buffer isolating MCU I/O from noisy 24V field wiring. Use Value: 5.5V input tolerance accepts direct connection to optocoupler outputs, eliminating level-shifter ICs. |
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 |
|---|---|---|---|
| SN74LVCH244A | Includes bus-hold circuitry on all inputs; slightly higher ICC (max 40µA vs. 10µA); same VCC range and drive strength. | Preferred where unused inputs may float (e.g., unpopulated I/O headers); adds ~0.5ns tpd penalty. | Select SN74LVCH244A only if bus-hold functionality is required to eliminate external pull resistors. |
| 74LVC244B | Same pinout and DC specs; improved ESD rating (±4000V HBM); identical AC performance and thermal metrics. | Better suited for high-ESD environments (e.g., handheld test equipment); no layout change required. | Choose 74LVC244B when enhanced ESD robustness is critical and TI's SN74LVC244APWRG4 long-term availability is uncertain. |
Compared with SN74LVC244APWRG4, SN74LVCH244A adds bus-hold but increases propagation delay, while 74LVC244B offers superior ESD immunity without altering timing or layout-making it a drop-in reliability upgrade where available.
Availability
SN74LVC244APWRG4 is available at Aetrix Electronics and suitable for server backplanes, LED display drivers, and industrial I/O expanders requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SN74LVC244APWRG4 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 with over 50 years of innovation in high-reliability interface ICs.
The SN74LVC244APWRG4 belongs to TI's LVC logic family, engineered for low-voltage, high-speed bus buffering in space-constrained industrial and telecom infrastructure where mixed-voltage interoperability and thermal resilience are critical.
FAQ
What is the maximum input voltage the SN74LVC244APWRG4 can tolerate?
The SN74LVC244APWRG4 accepts input voltages up to 5.5V regardless of VCC level, enabling direct interfacing with 5V logic while operating from 1.65V–3.6V supplies. This overvoltage tolerance is specified in the Recommended Operating Conditions table and does not require external clamping diodes. The absolute maximum rating is 6.5V, but sustained operation above 5.5V risks reliability degradation.
Does the SN74LVC244APWRG4 support hot-swap or live insertion?
Yes, the SN74LVC244APWRG4 supports live insertion via its Ioff feature: when VCC = 0V, all outputs enter high-impedance state and leakage current is limited to ±10µA at 5.5V. This prevents back-driving of powered subsystems during board replacement in modular systems like telecom line cards or server blades-verified per JESD78 latch-up and JEDEC JESD22-A114E testing.
What is the recommended bypass capacitor for SN74LVC244APWRG4?
A 0.1µF ceramic capacitor is recommended for SN74LVC244APWRG4, placed as close as possible to pin 20 (VCC) with a low-inductance path to pin 10 (GND). TI's layout guidelines specify mounting directly adjacent to the TSSOP-20 package with wide traces and connection to an unbroken ground plane. Parallel use of 1µF improves low-frequency noise rejection but does not replace the mandatory 0.1µF high-frequency decoupling.
Can SN74LVC244APWRG4 drive 50pF loads at 100MHz?
SN74LVC244APWRG4 can drive 50pF loads with acceptable signal integrity up to 100MHz, provided trace length is ≤12cm and damping resistors are used per TI's Application Report SCAS414AG. At 3.3V, its 5.9ns tpd and ±24mA drive ensure clean edges; however, simulations show overshoot exceeds 10% without source termination-so Rd = 22Ω near the output is advised for full-speed operation.
Is SN74LVC244APWRG4 pin-compatible with older SN74LVC244A variants?
Yes, SN74LVC244APWRG4 is fully pin-compatible with all SN74LVC244A variants in TSSOP-20 (PW) packaging-including SN74LVC244APW and SN74LVC244APWR. The "G4" suffix denotes green (lead-free) RoHS compliance and does not affect pinout, timing, or electrical behavior. Mechanical dimensions, thermal pad layout, and solder reflow profiles remain identical across these orderable part numbers.
SN74LVC244APWRG4 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:
- 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:
- 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
SN74LVC244APWRG4 FAQ
1.How can I place an order for SN74LVC244APWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244APWRG4 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 SN74LVC244APWRG4 reliable?
The price and inventory of SN74LVC244APWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244APWRG4 is usually 5 days.
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SN74LVC244APWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC244APWRG4 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 SN74LVC244APWRG4?
For technical support, including SN74LVC244APWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244APWRG4 requirements.
6.How does Aetrix verify that SN74LVC244APWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC244APWRG4 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 SN74LVC244APWRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC244APWRG4?
All SN74LVC244APWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244APWRG4, 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 SN74LVC244APWRG4 part is unused and in its original packaging.
Return procedure for SN74LVC244APWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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