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Texas Instruments SN74LVTH240DWR
- Part No.:
- SN74LVTH240DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVTH240DWR.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,090
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Product details
Overview
SN74LVTH240DWR 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 VCC. It features bus-hold on all data inputs, Ioff support for hot insertion, and operates down to 2.7 V. Used in backplane interface logic and legacy bus bridging where TTL-level compatibility and low-voltage supply coexist.
For engineers reviewing the SN74LVTH240DWR datasheet, SN74LVTH240DWR pinout, SN74LVTH240DWR application, or SN74LVTH240DWR equivalent, key selection criteria include its 20-pin SOIC (DW) package, 3.3-V VCC with 5-V tolerant inputs, ±100 µA Ioff, bus-hold functionality eliminating external resistors, and guaranteed 3-state behavior during power-up/down.
Technical Context
This device integrates two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. Logic propagation occurs only when OE is low; high OE forces outputs into high-impedance. The ABT (Advanced BiCMOS Technology) architecture enables fast switching (tPLH/tPHL ≤ 4.6 ns at VCC = 3.3 V) while maintaining robust noise immunity and latch-up resistance (>500 mA per JESD 17).
Bus-hold circuitry actively maintains valid logic states on unused inputs without pullup/pulldown resistors, reducing BOM count and layout complexity. Ioff and power-up 3-state functions ensure safe hot-insertion by disabling outputs during power transitions and preventing backflow current when powered down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and ensures stable function across wide supply variation. |
| IOL / IOH | 64 mA / −32 mA - drives heavy capacitive loads or multiple TTL inputs without external buffering. |
| tPLH/tPHL | ≤ 4.6 ns at VCC = 3.3 V - enables high-speed data transfer in 32-bit or wider parallel interfaces. |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5-V logic without level shifters in mixed-voltage systems. |
| Bus-Hold Current | ±750 µA max - reliably sustains logic state on floating inputs, eliminating need for discrete biasing components. |
| Ioff | ±100 µA - prevents damaging current flow during hot-swap events or partial system power-down. |
| VOLP | < 0.8 V at VCC = 3.3 V - minimizes ground bounce in dense PCB layouts with shared return paths. |
Pinout & Package
SN74LVTH240DWR uses a 20-pin SOIC (DW) package with 0.300-inch body width and 1.27 mm lead pitch. Pin 1 index area located at top-left corner; leads are gull-wing shaped with standard JEDEC MS-013 compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables respective 4-bit buffer sections; tied to VCC via pullup for default high-Z during power sequencing. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight buffered inputs with integrated bus-hold; tolerate 0–5.5 V regardless of VCC. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Noninverting outputs capable of sinking 64 mA or sourcing 32 mA; high-Z when OE is high. |
| VCC | Power supply | 3.3-V nominal supply; supports operation down to 2.7 V for battery-backed applications. |
| GND | Ground reference | Common return path for all signals and power; critical for minimizing VOLP and EMI in multi-driver configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | 5-V tolerant inputs with 3.3-V VCC enable seamless integration between legacy 5-V subsystems and modern low-voltage logic. |
| Integrated bus-hold | Eliminates external pullup/pulldown resistors on all eight data inputs, reducing component count and board space. |
| Hot-insertion support | Ioff and power-up 3-state prevent backdrive and bus contention during live card replacement in modular systems. |
| Low ground bounce | VOLP < 0.8 V ensures signal integrity in high-density parallel buses with simultaneous switching outputs. |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - guarantees robust operation under transient overvoltage or ESD stress conditions. |
Applications
| Backplane Interface Logic | Legacy Bus Bridging |
|---|---|
|
Use Scenario: Interfacing 32-bit ISA or PCI-X control signals between 5-V peripheral cards and 3.3-V host controller. IC Role / Device Role / Timing Role: Noninverting octal buffer providing level translation and drive strength enhancement for address/data strobes. Use Value: Eliminates need for discrete level shifters and reduces timing skew across parallel lines due to matched tPLH/tPHL. |
Use Scenario: Connecting older 5-V microcontrollers to newer 3.3-V FPGA-based I/O expanders in industrial PLC modules. IC Role / Device Role / Timing Role: Bidirectional signal conditioner enabling reliable handshake signaling despite voltage domain mismatch. Use Value: Bus-hold maintains valid logic levels during reset or firmware update gaps, preventing spurious bus activity. |
| Hot-Swappable Module Control | Low-Power Embedded Data Path |
|
Use Scenario: Enabling/disabling communication lanes in telecom line cards during field-replaceable unit (FRU) insertion. IC Role / Device Role / Timing Role: 3-state driver isolating module-specific control lines from shared backplane during insertion/removal. Use Value: Ioff and power-up 3-state guarantee zero current injection into live backplane, meeting NEBS Level 3 requirements. |
Use Scenario: Driving segmented LED displays or small LCD controllers in battery-powered handheld instruments. IC Role / Device Role / Timing Role: Low-voltage buffer supplying sufficient current to sink/display segments while operating from single-cell Li-ion supply. Use Value: 2.7–3.6 V VCC range accommodates discharge curve without regulation, extending runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC240APW | Lower drive strength (24 mA sink), no bus-hold, LVTTL-compatible (not 5-V tolerant) | Suitable only in fully 3.3-V systems without legacy interface requirements | Select when cost and power are prioritized over mixed-voltage interoperability and bus stability. |
| SN74AHCT240N | 5-V only supply (4.5–5.5 V), higher propagation delay (≤ 8 ns), no Ioff or bus-hold | Requires external pullups and cannot operate below 4.5 V | Choose only for pure 5-V environments where ABT performance advantages are unnecessary. |
Compared with SN74LVC240APW and SN74AHCT240N, the SN74LVTH240DWR uniquely combines 5-V input tolerance, bus-hold, Ioff, and 2.7-V operation-making it irreplaceable in mixed-voltage hot-swap and battery-operated legacy interface designs.
Availability
SN74LVTH240DWR is available at Aetrix Electronics and suitable for backplane interface logic, industrial PLC I/O expansion, telecom FRU control, and battery-powered embedded data path applications requiring stable component supply across extended temperature ranges (−40°C to 85°C).
Supply support for SN74LVTH240DWR 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 experience in high-reliability logic and interface solutions.
The SN74LVTH240DWR belongs to TI's ABT logic family, engineered specifically for robust mixed-voltage interfacing in industrial, telecom, and computing infrastructure where signal integrity, hot-swap safety, and supply flexibility are critical.
FAQ
What is the maximum input voltage rating for SN74LVTH240DWR?
The SN74LVTH240DWR supports input voltages up to 5.5 V regardless of VCC level, enabling direct connection to 5-V logic families without external level-shifting circuitry. This 5-V tolerance is specified across the full operating temperature range and is integral to its mixed-mode interface capability.
Does SN74LVTH240DWR require external pullup resistors on its inputs?
No, the SN74LVTH240DWR includes active bus-hold circuitry on all eight data inputs, which maintains valid logic states without external pullup or pulldown resistors. Using external resistors with bus-hold is explicitly discouraged in the datasheet as it may interfere with internal clamping behavior.
Can SN74LVTH240DWR be used in hot-swap applications?
Yes, the SN74LVTH240DWR is explicitly designed for hot-insertion use cases. Its Ioff specification (±100 µA) prevents damaging current backflow when powered down, and its power-up 3-state feature ensures outputs remain high-impedance during power sequencing-both verified per JEDEC standards.
What is the thermal resistance (θJA) of the SN74LVTH240DWR SOIC package?
The SN74LVTH240DWR in the DW (SOIC) package has a junction-to-ambient thermal resistance (θJA) of 58°C/W under standard JEDEC test conditions. This value assumes a 2-layer PCB with 1-in² copper pour and is critical for calculating junction temperature rise under sustained 64-mA output loading.
How does the bus-hold function behave during power-down?
During power-down, the bus-hold circuitry in the SN74LVTH240DWR remains functional until VCC drops below approximately 0.5 V, actively retaining the last valid logic state on each input. This behavior prevents floating inputs from inducing unintended transitions in downstream logic during brown-out or controlled shutdown sequences.
SN74LVTH240DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, 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
SN74LVTH240DWR FAQ
1.How can I place an order for SN74LVTH240DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH240DWR 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 SN74LVTH240DWR reliable?
The price and inventory of SN74LVTH240DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH240DWR is usually 5 days.
3.What payment methods are accepted for SN74LVTH240DWR?
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4.How is shipping managed for SN74LVTH240DWR?
SN74LVTH240DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH240DWR 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 SN74LVTH240DWR?
For technical support, including SN74LVTH240DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH240DWR requirements.
6.How does Aetrix verify that SN74LVTH240DWR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH240DWR 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 SN74LVTH240DWR meets industry standards.
7.What is the process for return or replacement of SN74LVTH240DWR?
All SN74LVTH240DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH240DWR, 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 SN74LVTH240DWR part is unused and in its original packaging.
Return procedure for SN74LVTH240DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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