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Texas Instruments SN74LVTH244ADWG4
- Part No.:
- SN74LVTH244ADWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVTH244ADWG4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,347
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Product details
Overview
SN74LVTH244ADWG4 from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal operation (5-V inputs/outputs with 3.3-V VCC). It features bus-hold on all data inputs, Ioff and power-up 3-state for hot insertion, and supports unregulated battery operation down to 2.7 V. Used in legacy 5-V system interfacing, backplane drivers, and industrial control I/O expansion.
For engineers reviewing the SN74LVTH244ADWG4 datasheet, SN74LVTH244ADWG4 pinout, SN74LVTH244ADWG4 application, or SN74LVTH244ADWG4 equivalent, key selection criteria include 3-state timing (tPZH/tPZL ≤ 5.3 ns), output drive strength (IOL = 64 mA), bus-hold current (±750 µA), thermal resistance (θJA = 58°C/W), and SOIC-20 package compatibility with legacy PCB layouts.
Technical Context
The SN74LVTH244ADWG4 implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. Its ABT (Advanced BiCMOS Technology) architecture enables TTL-level input compatibility while operating at 3.3-V VCC, supporting bidirectional voltage translation between 3.3-V logic domains and 5-V legacy buses.
Internal bus-hold circuitry actively maintains valid logic states on floating A-inputs without external resistors, and Ioff protection disables outputs during power-down to prevent backflow current. Power-up 3-state ensures outputs remain high-impedance until VCC stabilizes, eliminating bus contention during system boot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports wide-input unregulated battery supply; no external regulator required for portable systems. |
| IOL / IOH | 64 mA / −32 mA - drives heavy capacitive loads (e.g., >50 pF traces) without signal degradation in backplane applications. |
| tPZH, tPZL | ≤ 5.3 ns / ≤ 4.9 ns - fast 3-state enable/disable minimizes bus turnaround time in shared-data-path systems. |
| Bus-Hold Current | ±750 µA - actively holds unused inputs at valid logic levels; eliminates need for 10-kΩ pullup/pulldown resistors on control lines. |
| θJA | 58°C/W - SOIC-20 package enables reliable operation up to 85°C ambient without forced airflow in industrial enclosures. |
| VIL/VIH | 0.8 V / 2.0 V - TTL-compatible input thresholds ensure robust noise margin when interfacing with 5-V microcontrollers or FPGAs. |
| VOHP | < 0.8 V - low output ground bounce reduces EMI and prevents false triggering in adjacent high-speed logic. |
Pinout & Package
SN74LVTH244ADWG4 uses a 20-pin SOIC (DW) package with 7.5-mm body width, 12.83-mm length, and 2.65-mm height. Pin 1 index area located at top-left corner; pin 1 marked by beveled edge or dot. RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables respective 4-bit buffer group; tied to VCC via pullup resistor for safe power-up high-impedance state. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for two independent 4-bit channels; each has integrated bus-hold circuitry. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive external bus or load; high-impedance when OE = high; sink/source up to 64 mA/−32 mA. |
| VCC | Power supply | 3.3-V nominal supply; accepts 2.7–3.6 V range; decoupling capacitor required at pin 10 per layout guidelines. |
| GND | Ground reference | Signal and power return; must be connected to low-impedance ground plane to minimize ground bounce (VOLP < 0.8 V). |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode interface | Accepts 5-V TTL inputs and drives 5-V loads while powered from 3.3-V rail - eliminates level-shifters in 5-V/3.3-V hybrid systems. |
| Hot-insertion support | Ioff and power-up 3-state prevent backfeed current and bus conflicts during live board replacement in telecom or server backplanes. |
| Integrated bus-hold | Eliminates external pullup/pulldown resistors on all eight data inputs - reduces BOM count and PCB area in space-constrained modules. |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - withstands transient overvoltage events in industrial motor-control I/O interfaces. |
| ESD robustness | 2000-V HBM and 200-V MM per JESD 22 - survives handling and assembly without additional protection circuitry. |
Applications
| Industrial PLC I/O Expansion | Legacy Microcontroller Bus Interface |
|---|---|
Use Scenario: Adding digital input/output capability to programmable logic controllers using 5-V field sensors and actuators. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer isolating 3.3-V FPGA control logic from 5-V industrial bus; enables hot-swap of I/O modules. Use Value: Eliminates discrete level shifters and pull resistors, reducing component count by ≥12 parts per channel while maintaining 5.3-ns bus turnaround. |
Use Scenario: Interfacing modern 3.3-V ARM-based MCU peripherals to legacy 5-V parallel memory or display controllers. IC Role / Device Role / Timing Role: Noninverting octal driver translating MCU GPIO signals to 5-V bus standards with sub-4-ns propagation delay. Use Value: Maintains full 5-V noise margin (VIL = 0.8 V, VIH = 2.0 V) while delivering 64-mA sink current for LED segment drivers or relay coils. |
| Backplane Data Distribution | Test Equipment Signal Conditioning |
Use Scenario: Driving long, unterminated backplane traces in modular instrumentation chassis with multiple 5-V daughter cards. IC Role / Device Role / Timing Role: High-drive 3-state buffer enabling multi-drop bus arbitration; OE pins synchronized to master clock for glitch-free switching. Use Value: 64-mA output current sustains signal integrity across 15-cm FR-4 traces loaded with 50-pF capacitance per slot, verified per CL = 50 pF test condition. |
Use Scenario: Isolating DUT signals from automated test equipment (ATE) controller logic during functional testing of 5-V ASICs. IC Role / Device Role / Timing Role: Input-protection and output-isolation buffer with Ioff disabled during power-off to prevent damage from floating ATE pins. Use Value: Prevents backfeed current into powered-down DUTs; bus-hold maintains known state on open inputs during test sequence transitions. |
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 IOL), no bus-hold, 1.65–3.6 V VCC; lacks Ioff and hot-insertion support. | Suitable only for low-capacitance, fully powered 3.3-V-only systems; requires external pull resistors. | Select when cost sensitivity outweighs robustness requirements and bus-hold is unnecessary. |
| SN74AHCT244N | 5-V only VCC (4.5–5.5 V); higher propagation delay (tPLH = 8 ns); no 3.3-V compatibility. | Restricted to pure 5-V designs; cannot interface 3.3-V logic without external level shifting. | Choose only for legacy 5-V-only boards where SN74LVTH244ADWG4's mixed-voltage capability is unused. |
Compared with SN74LVC244APWR and SN74AHCT244N, the SN74LVTH244ADWG4 uniquely combines 3.3-V operation, 5-V input tolerance, bus-hold, and hot-insertion - making it irreplaceable in mixed-voltage industrial I/O where reliability and design simplification are critical.
Availability
SN74LVTH244ADWG4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy microcontroller bus interfacing, and backplane data distribution requiring stable component supply across extended product lifecycles.
Supply support for SN74LVTH244ADWG4 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 over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVTH244ADWG4 belongs to TI's 3.3-V ABT logic family, engineered for seamless interoperability between emerging low-voltage logic and legacy 5-V systems - targeting industrial control, test equipment, and infrastructure applications demanding robust mixed-signal interfacing.
FAQ
What is the maximum operating temperature for SN74LVTH244ADWG4?
The SN74LVTH244ADWG4 is rated for operation from −40°C to +85°C ambient temperature. Its SOIC-20 package exhibits a thermal resistance θJA of 58°C/W, enabling reliable performance in enclosed industrial enclosures without forced cooling when power dissipation remains below 150 mW.
Does SN74LVTH244ADWG4 require external pullup resistors on its data inputs?
No. The SN74LVTH244ADWG4 integrates active bus-hold circuitry on all eight data inputs (1A1–1A4, 2A1–2A4), which maintains valid logic states on floating inputs without external pullup or pulldown resistors - reducing BOM cost and PCB real estate.
Can SN74LVTH244ADWG4 safely interface a 3.3-V FPGA to a 5-V parallel bus?
Yes. The SN74LVTH244ADWG4 supports mixed-mode operation: its inputs tolerate 5-V signals while powered from 3.3 V, and its outputs drive 5-V logic levels. This eliminates external level shifters when connecting 3.3-V FPGAs to legacy 5-V memory or peripheral buses.
What is the purpose of the Ioff feature in SN74LVTH244ADWG4?
The Ioff circuitry in SN74LVTH244ADWG4 disables outputs when VCC = 0 V, preventing damaging current backflow from live 5-V buses into a powered-down system - a critical requirement for hot-pluggable modules in telecom and server backplanes.
How does SN74LVTH244ADWG4 handle power-up sequencing in systems with multiple voltage rails?
The SN74LVTH244ADWG4 incorporates power-up 3-state logic that forces outputs into high-impedance until VCC reaches a valid level, preventing bus contention during power ramp-up. OE pins should be pulled to VCC via ≥10-kΩ resistor to ensure safe default state.
SN74LVTH244ADWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SOIC
SN74LVTH244ADWG4 FAQ
1.How can I place an order for SN74LVTH244ADWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH244ADWG4 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 SN74LVTH244ADWG4 reliable?
The price and inventory of SN74LVTH244ADWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH244ADWG4 is usually 5 days.
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SN74LVTH244ADWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH244ADWG4 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 SN74LVTH244ADWG4?
For technical support, including SN74LVTH244ADWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH244ADWG4 requirements.
6.How does Aetrix verify that SN74LVTH244ADWG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVTH244ADWG4 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 SN74LVTH244ADWG4 meets industry standards.
7.What is the process for return or replacement of SN74LVTH244ADWG4?
All SN74LVTH244ADWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH244ADWG4, 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 SN74LVTH244ADWG4 part is unused and in its original packaging.
Return procedure for SN74LVTH244ADWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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