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Texas Instruments SN74LVT240ADW
- Part No.:
- SN74LVT240ADW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVT240ADW.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:561
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Product details
Overview
SN74LVT240ADW from Texas Instruments is an octal buffer/line driver IC with dual 4-bit noninverting outputs, designed for 3.3-V VCC operation while supporting 5-V TTL-level inputs and outputs. It features Ioff and power-up 3-state for hot insertion, operates down to 2.7 V, and delivers tPLH/tPHL ≤ 3.8 ns at 3.3 V - used in mixed-voltage bus interface and backplane driver applications.
For engineers reviewing the SN74LVT240ADW datasheet, SN74LVT240ADW pinout, SN74LVT240ADW application, or SN74LVT240ADW equivalent, key selection criteria include its 20-pin SOIC (DW) package, 64 mA sink capability, ±100 µA Ioff specification, support for unregulated battery operation, and compatibility with 5-V signal environments interfacing to 3.3-V logic systems.
Technical Context
The SN74LVT240ADW implements two independent 4-bit noninverting buffer sections, each controlled by a dedicated output-enable (OE) input. Its LVT (Low-Voltage TTL) architecture enables bidirectional voltage translation: 5-V-tolerant inputs with 3.3-V VCC supply, and 5-V-compatible output swing under load.
It integrates Ioff circuitry that disables outputs when VCC = 0 V, preventing current backflow during hot insertion, and power-up 3-state logic that forces high-impedance outputs when VCC is below 1.5 V - eliminating bus contention during power sequencing in modular systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated Li-ion or buck-regulated 3.3-V rails without external regulation |
| IOL / IOH | 64 mA sink / −32 mA source - drives standard TTL loads and short PCB traces without buffering |
| tPLH / tPHL | ≤3.8 ns at VCC = 3.3 V - enables >200 MHz data rates in point-to-point or lightly loaded bus topologies |
| Ioff | ±100 µA at VCC = 0 - blocks damaging back-current during live card insertion into powered backplanes |
| VIL / VIH | 0.8 V / 2.0 V - compatible with 5-V CMOS/TTL logic thresholds while powered from 3.3-V supply |
| VOH / VOL | ≥2.4 V / ≤0.5 V at IOL = 24 mA - ensures noise margin >0.4 V in 3.3-V LVT systems |
| θJA (DW) | 58°C/W - allows continuous 100 mW dissipation at TA = 85°C in standard SOIC PCB layout |
Pinout & Package
SN74LVT240ADW uses a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for respective 4-bit sections - tie high via pullup for default disable during power ramp |
| 2–5, 13–16 | 1A1–1A4, 2A1–2A4 | Data inputs - 5-V tolerant; accept TTL/CMOS levels regardless of VCC state |
| 6–9, 11–14 | 1Y1–1Y4, 2Y1–2Y4 | Noninverting buffered outputs - drive 50-pF loads with <4 ns propagation delay |
| 10 | GND | Ground reference - must be low-inductance connection to minimize ground bounce (VOLP < 0.8 V) |
| 20 | VCC | 3.3-V supply input - requires local 0.1 µF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V input/output voltage tolerance with 3.3-V VCC - eliminates level-shifters in 3.3/5-V interconnects |
| Hot-insertion support | Ioff + power-up 3-state - prevents bus conflicts and backfeed damage when inserting cards into live backplanes |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V - maintains signal integrity in high-speed, multi-driver bus environments |
| Latch-up immunity | Exceeds 100 mA per JESD 78 Class II - ensures robustness in noisy industrial or automotive ECU designs |
| ESD protection | 2000-V HBM, 200-V MM, 1000-V CDM - reduces field failure risk in manual handling and assembly |
Applications
| Backplane Bus Interface | Modular I/O Expansion |
|---|---|
Use Scenario: Interfacing 5-V legacy peripheral modules to a 3.3-V FPGA-based controller backplane. IC Role / Device Role / Timing Role: Octal noninverting buffer isolating and translating control/data lines between voltage domains. Use Value: Eliminates discrete level shifters; supports hot-plug insertion without system reset or bus lockup. | Use Scenario: Adding isolated digital I/O banks to a programmable logic carrier board using plug-in mezzanine cards. IC Role / Device Role / Timing Role: Direction-controlled line driver enabling bidirectional data flow on shared 8-bit parallel buses. Use Value: Ioff prevents current leakage when cards are removed; tPHL < 4 ns preserves timing margins at 100+ MHz clock rates. |
| Industrial PLC Baseboard | Test Equipment Signal Conditioning |
Use Scenario: Driving opto-isolator inputs and relay drivers from a 3.3-V microcontroller in a DIN-rail mounted PLC. IC Role / Device Role / Timing Role: High-current buffer amplifying MCU GPIO outputs to meet 5-V industrial logic thresholds. Use Value: 64 mA sink capability directly drives 10-mA optocoupler LEDs; latch-up immunity withstands field ESD events. | Use Scenario: Conditioning DUT signals in automated test equipment where 5-V DUTs connect to 3.3-V digitizer ASICs. IC Role / Device Role / Timing Role: Input-tolerant buffer isolating and retiming asynchronous control strobes and status flags. Use Value: 5-V input tolerance avoids clamping diodes; VOLP < 0.8 V ensures clean low-state definition for sensitive comparators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH240ADW | Higher drive strength (IOL = 12 mA typ), lower ICC (0.1 mA disabled), but no Ioff or power-up 3-state | Lacks hot-insertion support; unsuitable for live-backplane systems | Prefer SN74LVT240ADW where card insertion occurs under power |
| 74ALVC240PW | 3.3-V only I/O (no 5-V tolerance), smaller TSSOP-20 package, lower θJA (83°C/W) | Requires external level shifters for 5-V interfaces; better for space-constrained 3.3-V-only designs | Choose SN74LVT240ADW when interfacing to legacy 5-V peripherals |
Compared with SN74LVTH240ADW and 74ALVC240PW, SN74LVT240ADW uniquely combines 5-V input tolerance, Ioff-enabled hot insertion, and SOIC-20 manufacturability - making it the only option among the three qualified for mixed-voltage modular backplane systems requiring zero-bus-conflict insertion.
Availability
SN74LVT240ADW is available at Aetrix Electronics and suitable for industrial PLC baseboards, modular test equipment, backplane bus interfaces, and hot-pluggable I/O expansion systems requiring stable component supply across extended product lifecycles.
Supply support for SN74LVT240ADW 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade performance.
The SN74LVT240ADW belongs to TI's LVT logic family, engineered specifically for mixed-voltage system interfacing - bridging 5-V legacy infrastructure with modern 3.3-V digital controllers in industrial, telecom, and instrumentation applications.
FAQ
What is the maximum operating temperature range for SN74LVT240ADW?
The SN74LVT240ADW is specified for operation from −40°C to +85°C ambient temperature. This industrial temperature range is validated across all electrical parameters including propagation delay, output drive, and Ioff behavior - ensuring reliable performance in factory automation, outdoor telecom, and motor control environments where thermal cycling occurs.
Does SN74LVT240ADW support true 5-V input tolerance?
Yes, SN74LVT240ADW supports input voltages up to 5.5 V independent of VCC, verified per absolute maximum ratings and recommended operating conditions. This allows direct connection to 5-V TTL/CMOS sources without external clamping or level-shifting circuitry - a core feature confirmed in the SCBS134K datasheet Section 6.2.
Can SN74LVT240ADW be used in hot-swap applications?
Yes, SN74LVT240ADW is explicitly designed for hot insertion, featuring both Ioff circuitry (blocking current when VCC = 0 V) and power-up 3-state logic (forcing high-Z outputs during VCC ramp). These functions are tested per JEDEC standards and documented in the device description and absolute maximum ratings table of the SN74LVT240ADW datasheet.
What is the recommended pullup resistor value for OE pins on SN74LVT240ADW?
The minimum pullup resistor value for OE pins on SN74LVT240ADW is determined by the current-sinking capability of the driving source. Per the datasheet, when VCC is above 1.5 V, OE should be tied to VCC through a pullup; typical values range from 4.7 kΩ to 10 kΩ for standard logic drivers - ensuring fast disable while limiting quiescent current to <100 µA.
Is SN74LVT240ADW pin-compatible with other 20-pin octal buffers like SN74LS240?
No, SN74LVT240ADW is not pin-compatible with SN74LS240. While both are 20-pin octal buffers, SN74LS240 uses a different pinout (e.g., GND at Pin 10 vs. Pin 10 on SN74LVT240ADW), different logic polarity (inverting vs. noninverting), and incompatible voltage domains. Direct replacement requires PCB redesign - confirmed by comparing logic diagrams and pin tables in their respective datasheets.
SN74LVT240ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
SN74LVT240ADW FAQ
1.How can I place an order for SN74LVT240ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT240ADW 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 SN74LVT240ADW reliable?
The price and inventory of SN74LVT240ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT240ADW is usually 5 days.
3.What payment methods are accepted for SN74LVT240ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVT240ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVT240ADW?
SN74LVT240ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT240ADW 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 SN74LVT240ADW?
For technical support, including SN74LVT240ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT240ADW requirements.
6.How does Aetrix verify that SN74LVT240ADW is sourced from the original manufacturer or authorized distributors?
All SN74LVT240ADW 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 SN74LVT240ADW meets industry standards.
7.What is the process for return or replacement of SN74LVT240ADW?
All SN74LVT240ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT240ADW, 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 SN74LVT240ADW part is unused and in its original packaging.
Return procedure for SN74LVT240ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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