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Texas Instruments SN74LVC240APWG4
- Part No.:
- SN74LVC240APWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC240APWG4.pdf
- Description:
- IC BUFFER INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC240APWG4 from Texas Instruments is an octal noninverting buffer/driver with dual 3-state output banks, operating from 1.65V to 3.6V supply, supporting 5.5V-tolerant inputs, delivering ≤6.5ns propagation delay at 3.3V, and enabling mixed-mode signal interfacing (e.g., 5V logic driving 3.3V bus). It is used in digital signal redriving, transmission line termination, and controller reset hold applications.
For engineers reviewing the SN74LVC240APWG4 datasheet, SN74LVC240APWG4 pinout, SN74LVC240APWG4 application, or SN74LVC240APWG4 equivalent, key selection criteria include VCC range compatibility, 3-state bank control timing, Ioff-enabled live insertion, ground bounce (VOLP < 0.8V) and undershoot (VOHV > 2V) performance at 3.3V, and TSSOP-20 package thermal metrics.
Technical Context
The SN74LVC240APWG4 implements two independent 4-channel banks (Bank 1: pins 1A1–1A4/1Y1–1Y4; Bank 2: pins 2A1–2A4/2Y1–2Y4), each controlled by a dedicated active-low output enable (1OE, 2OE). Its CMOS architecture supports rail-to-rail output swing (0–VCC) with balanced sourcing/sinking capability (±24mA at 3V) and Schmitt-trigger–free standard CMOS inputs.
It features Ioff circuitry that disables all outputs when VCC = 0V, preventing back-drive current and enabling partial-power-down operation. Input voltage tolerance up to 5.5V allows direct interfacing with 5V systems while powered from 3.3V or lower, without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables single-supply operation across 1.8V, 2.5V, and 3.3V logic domains. |
| Input Voltage Tolerance | Up to 5.5V - Permits direct connection to 5V signals without external clamping or translation. |
| Max Propagation Delay | 6.5ns at VCC = 3.3V - Supports ≥150MHz signal redriving in short-trace digital interconnects. |
| Output Drive Strength | ±24mA at VCC = 3V - Sufficient to drive 50Ω transmission lines or multiple CMOS loads (≤10pF). |
| Ioff Current | ±10μA max at VI/VO = 5.5V - Ensures safe live insertion and hot-swap capability in backplane systems. |
| Ground Bounce (VOLP) | <0.8V at VCC = 3.3V - Reduces noise coupling into shared ground planes during simultaneous switching. |
| ESD Rating (HBM) | ±2000V - Meets industrial-grade ESD robustness per ANSI/ESDA/JEDEC JS-001. |
Pinout & Package
Packaged in a 20-pin TSSOP (PW), the SN74LVC240APWG4 measures 6.5mm × 6.4mm (including pins) with a 6.5mm × 4.4mm body footprint and 0.65mm lead pitch. The exposed thermal pad (RKS variant only) is not present in PW; no thermal pad connection required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE (Pin 1) | Bank 1 Output Enable (active low) | Controls Y1–Y4 high-impedance state; must be pulled high via resistor during power-up to prevent bus contention. |
| 2OE (Pin 19) | Bank 2 Output Enable (active low) | Independent control of Y5–Y8; enables selective bus isolation without affecting Bank 1 signals. |
| 1A1–1A4 (Pins 2,3,4,7) | Bank 1 Input Channels | Noninverting inputs for outputs Y1–Y4; accept 0–5.5V logic levels regardless of VCC. |
| 2A1–2A4 (Pins 11,13,16,17) | Bank 2 Input Channels | Noninverting inputs for outputs Y5–Y8; electrically isolated from Bank 1 for dual-bus routing. |
| 1Y1–1Y4 (Pins 18,17,16,15) | Bank 1 Output Channels | 3-state buffered outputs; high-impedance when 1OE = high; drive strength matches input logic family. |
| 2Y1–2Y4 (Pins 9,12,14,15) | Bank 2 Output Channels | 3-state buffered outputs; pin 15 (2Y4) shares node with 1Y4 - requires careful net assignment. |
| VCC (Pin 20) | Positive Supply | Primary power rail; bypass with 0.1μF capacitor placed adjacent to pin for stable switching noise suppression. |
| GND (Pin 10) | Ground Reference | Common return path for all I/O and supply currents; must connect to solid ground plane for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal interface | 5V-tolerant inputs with 3.3V VCC allow direct bridging between legacy 5V peripherals and modern low-voltage controllers. |
| Dual independent 3-state banks | Separate OE control per 4-channel bank enables selective bus arbitration and avoids full-bus shutdown during partial reconfiguration. |
| Ioff partial-power-down protection | Outputs enter high-Z when VCC = 0V, eliminating back-drive current and enabling safe hot-plug operation in modular systems. |
| Low ground bounce & undershoot | VOLP < 0.8V and VOHV > 2V at 3.3V reduce signal integrity degradation during high-speed switching on shared PCB ground planes. |
| High-speed CMOS architecture | 6.5ns tpd at 3.3V supports clean edge delivery into ≤50pF loads, meeting setup/hold timing for FPGA I/O and microcontroller peripherals. |
Applications
| LED Indicator Driving | Digital Signal Redriving |
|---|---|
|
Use Scenario: Driving multiple discrete LEDs from a low-current MCU GPIO port with current limiting resistors. IC Role / Device Role / Timing Role: Noninverting buffer providing current gain and voltage-level translation (e.g., 3.3V MCU → 5V LED anode). Use Value: Eliminates need for discrete transistors; 24mA per channel supports common LED configurations without external drivers. |
Use Scenario: Reconditioning degraded clock or data signals traversing long PCB traces (>10 cm) between SoC and peripheral ICs. IC Role / Device Role / Timing Role: Redriver restoring signal amplitude, slew rate, and noise margin before receiver input. Use Value: 6.5ns tpd and low VOLP ensure timing budget compliance; 5.5V input tolerance accommodates overshoot on legacy buses. |
| Transmission Line Driving | Controller Reset Hold |
|
Use Scenario: Driving 50Ω coaxial or PCB microstrip lines in industrial communication modules (e.g., RS-485 PHY interface). IC Role / Device Role / Timing Role: Impedance-matched source driver with series-damping resistor support (per TI layout guidelines). Use Value: ±24mA drive strength sustains signal integrity over 12cm traces; balanced output reduces EMI radiation. |
Use Scenario: Holding a system reset line in asserted state during processor boot sequence or firmware update. IC Role / Device Role / Timing Role: 3-state buffer isolating reset generator from downstream logic until initialization completes. Use Value: Dual OE pins allow independent release of CPU vs. peripheral reset domains; Ioff prevents leakage during power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC240ADW | SOIC-20 package (12.8mm × 10.3mm); higher RθJA (114.8°C/W) than PW's 120.3°C/W; same electrical specs. | Better suited for through-hole prototyping or legacy board designs requiring SOIC footprint. | Select when mechanical compatibility with existing SOIC layouts is required; verify thermal derating at full load. |
| SN74LVCH240A | Includes bus-hold circuitry on all inputs; identical VCC range and drive strength; slightly higher tpd (7.5ns @ 3.3V). | Eliminates need for external pull-up/down resistors on unused or floating inputs in unpopulated systems. | Prefer for systems with undriven control lines or intermittent signal sources where input stability is critical. |
Compared with SN74LVC240ADW and SN74LVCH240A, the SN74LVC240APWG4 offers the smallest PCB footprint (TSSOP-20), optimal thermal resistance for dense surface-mount layouts, and pure standard CMOS inputs-making it ideal for space-constrained, high-density digital interfaces where external biasing is already implemented.
Availability
SN74LVC240APWG4 is available at Aetrix Electronics and suitable for industrial control backplanes, automotive body electronics modules, and embedded computing I/O expansion requiring stable component supply, long-term lifecycle assurance, and consistent TSSOP-20 packaging.
Supply support for SN74LVC240APWG4 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 decades of expertise in high-reliability logic families and industrial-grade qualification.
The SN74LVC240APWG4 belongs to the LVC (Low-Voltage CMOS) logic family, designed specifically for low-voltage, high-speed digital interfacing in battery-powered, space-constrained, and mixed-voltage systems.
FAQ
What is the maximum input voltage the SN74LVC240APWG4 can tolerate?
The SN74LVC240APWG4 accepts input voltages up to 5.5V regardless of VCC level, enabling direct interfacing with 5V logic families while operating from 1.65V–3.6V supplies. This overvoltage tolerance is specified in the Absolute Maximum Ratings table and verified across temperature ranges; exceeding 5.5V risks permanent damage per JESD78 limits.
Does the SN74LVC240APWG4 support hot-swap or live-insertion applications?
Yes, the SN74LVC240APWG4 supports live insertion via its Ioff feature: when VCC = 0V, all outputs enter high-impedance mode with leakage ≤±10μA, preventing back-drive current into powered subsystems. This behavior is characterized per JEDEC JESD78 and validated across –40°C to 125°C, making SN74LVC240APWG4 suitable for modular backplane and hot-plug card designs.
What is the recommended bypass capacitor for the SN74LVC240APWG4?
A 0.1μF ceramic capacitor is recommended directly between VCC (Pin 20) and GND (Pin 10) for the SN74LVC240APWG4, placed as close as possible to the pins with minimal trace length. For enhanced noise suppression across frequencies, TI recommends paralleling with a 1μF capacitor. Layout guidelines specify wide traces and short ground return paths to minimize impedance and maintain signal integrity during fast switching.
Can both output banks of the SN74LVC240APWG4 be enabled simultaneously?
Yes, both Bank 1 (controlled by 1OE) and Bank 2 (controlled by 2OE) can be enabled simultaneously by holding both OE pins low. The device's functional table confirms that any input combination with OE = L results in Y = A. However, simultaneous enable must respect total current limits: combined output current must not exceed ±100mA (sum of all sourcing/sinking channels), and VCC/GND supply current must remain within ±100mA absolute maximum ratings.
Is the SN74LVC240APWG4 pin-compatible with older SN74LVC240A variants?
Yes, the SN74LVC240APWG4 shares identical pinout, function mapping, and electrical specifications with all SN74LVC240A variants (e.g., DW, NS, DGS), including the original SN74LVC240A. The "G4" suffix denotes RoHS-compliant packaging and tape-and-reel delivery per TI's standard ordering conventions; no functional or timing differences exist between G4 and non-G4 versions of the same package type.
SN74LVC240APWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, 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
SN74LVC240APWG4 FAQ
1.How can I place an order for SN74LVC240APWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC240APWG4 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 SN74LVC240APWG4 reliable?
The price and inventory of SN74LVC240APWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC240APWG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC240APWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC240APWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC240APWG4?
SN74LVC240APWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC240APWG4 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 SN74LVC240APWG4?
For technical support, including SN74LVC240APWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC240APWG4 requirements.
6.How does Aetrix verify that SN74LVC240APWG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC240APWG4 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 SN74LVC240APWG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC240APWG4?
All SN74LVC240APWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC240APWG4, 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 SN74LVC240APWG4 part is unused and in its original packaging.
Return procedure for SN74LVC240APWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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