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Texas Instruments SN74LVC240ADW
- Part No.:
- SN74LVC240ADW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC240ADW.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
SN74LVC240ADW from Texas Instruments is an octal non-inverting 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 into 3.3V system buses) in industrial control backplanes and memory address buffering.
For engineers reviewing the SN74LVC240ADW datasheet, SN74LVC240ADW pinout, SN74LVC240ADW application, or SN74LVC240ADW equivalent, key selection considerations include its dual independent 3-state enable architecture, Ioff live-insertion support, ±50mA output drive capability, and SOIC-20 package compatibility with legacy board layouts requiring robust bus isolation and level translation.
Technical Context
The SN74LVC240ADW implements two independent 4-channel buffer banks, each controlled by a dedicated active-low output enable (OE1/OE2), allowing selective tri-state control of groups A1–A4/Y1–Y4 and A5–A8/Y5–Y8. Its CMOS input structure accepts voltages up to 5.5V regardless of VCC, enabling direct interfacing between 5V peripherals and 3.3V logic domains without external level shifters.
Each output features balanced push-pull drive with ±50mA current capability, low ground bounce (<0.8V) and undershoot (>2V) at 3.3V, and Ioff protection that disables all outputs when VCC = 0V-critical for hot-swap and partial-power-down systems. The device meets JESD17 latch-up immunity >100mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65V to 3.6V - Enables operation across 1.8V, 2.5V, and 3.3V logic domains without voltage translation. |
| Input Voltage Tolerance | Up to 5.5V - Allows safe connection of 5V signals to 3.3V-powered SN74LVC240ADW without damage or external clamping. |
| Max Propagation Delay | 6.5ns at VCC = 3.3V - Supports >100MHz digital signal redriving in high-speed bus applications. |
| Output Drive Strength | ±50mA per output - Sufficient to drive 50Ω transmission lines or multiple CMOS loads without external buffers. |
| Ioff Current | ±10μA max at VI/VO = 5.5V - Ensures zero-current leakage during power-down, preventing back-drive and bus contention. |
| Operating Temperature | –40°C to +125°C - Qualified for extended industrial and automotive under-hood environments. |
| ESD Rating (HBM) | ±2000V - Meets JEDEC JS-001 for robust handling in automated assembly and field service. |
Pinout & Package
SN74LVC240ADW uses a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm (body: 12.8mm × 7.5mm), with standard 0.050″ lead pitch and gull-wing leads compatible with IPC-7351B footprint DW_20.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low bank enable inputs - Independently disable Bank 1 (pins 2,3,4,5 → 18,17,16,15) or Bank 2 (pins 6,7,8,9 → 14,13,12,11). |
| 2,3,4,5 | A1–A4 | Bank 1 input channels - Non-inverting inputs tied to upstream logic (e.g., microcontroller address lines). |
| 6,7,8,9 | A5–A8 | Bank 2 input channels - Accept separate data/control signals, isolated from Bank 1 by independent OE control. |
| 11,12,13,14 | Y5–Y8 | Bank 1 output channels - Drive downstream loads (e.g., memory chip selects); high-impedance when OE1 = high. |
| 15,16,17,18 | Y1–Y4 | Bank 2 output channels - Provide redundant or parallel bus segments; tri-stated independently of Bank 1. |
| 10 | GND | Power return reference - Must be low-impedance connection to minimize ground bounce affecting VOL/VOLP. |
| 20 | VCC | Positive supply - Requires local 0.1μF ceramic bypass capacitor to suppress switching noise and ensure stable tpd. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal interface | 5.5V-tolerant inputs at 1.65–3.6V VCC - Eliminates need for discrete level translators when connecting 5V sensors to 3.3V MCUs. |
| Dual independent 3-state banks | Separate OE1/OE2 pins - Enables time-multiplexed bus sharing (e.g., one bank drives display interface while other handles UART expansion). |
| Ioff partial-power-down protection | Outputs disabled with VCC = 0V - Prevents back-driving powered subsystems during hot-plug insertion or firmware reset sequences. |
| Low ground bounce & undershoot | VOLP < 0.8V / VOHV > 2V at 3.3V - Reduces EMI and signal integrity issues in dense PCB layouts with shared ground planes. |
| JESD17 latch-up immunity | >100mA - Guarantees robustness against transient overcurrent events in industrial motor-control I/O modules. |
Applications
| Industrial Backplane Buffering | Memory Address Redriving |
|---|---|
Use Scenario: Isolating and strengthening address/data lines between a 3.3V FPGA and multiple 5V peripheral cards on a modular PLC backplane. IC Role / Device Role / Timing Role: Octal non-inverting buffer with dual 3-state control - provides bidirectional bus isolation and timing-critical signal regeneration without skew accumulation. Use Value: Enables reliable 100+ MHz address strobing across 15cm backplane traces while suppressing crosstalk via controlled drive strength and low tpd. |
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM chips with capacitive loading exceeding 40pF per line. IC Role / Device Role / Timing Role: High-speed redriver with ±50mA output - restores signal edge integrity degraded by trace capacitance and fanout. Use Value: Maintains setup/hold timing margins at 3.3V supply by reducing rise/fall times to <3ns and limiting VOL drift to ≤0.55V under full load. |
| Hot-Swappable I/O Module Interface | Legacy System Level Translation |
Use Scenario: Enabling safe insertion/removal of I/O expansion cards in a powered industrial controller rack without disrupting active communication buses. IC Role / Device Role / Timing Role: Ioff-enabled 3-state buffer - automatically places outputs in high-Z when card power is absent, preventing back-drive into live backplane. Use Value: Eliminates need for mechanical interlocks or sequenced power supplies, reducing system BOM cost and improving field-service uptime. |
Use Scenario: Interfacing a modern 3.3V SoC with legacy 5V-only LCD display controllers and keypad scan matrices. IC Role / Device Role / Timing Role: Voltage-tolerant buffer - accepts 5V scan pulses as inputs while sourcing 3.3V-compatible outputs to the SoC. Use Value: Avoids redesign of existing 5V display subassemblies, extending product lifecycle and reducing qualification effort for new host platforms. |
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 |
|---|---|---|---|
| SN74LVC240APW | TSSOP-20 package (6.5mm × 6.4mm); 120.3°C/W RθJA vs. 114.8°C/W for DW | Better suited for space-constrained PCBs; requires rework of land pattern and thermal relief design | Select when board area is limited and thermal margin allows higher junction temperature rise. |
| 74LVC240ADB | SSOP-20 package (7.2mm × 7.8mm); 121.7°C/W RθJA; identical electrical specs | Higher pin density than SOIC but lower creepage/clearance; not RoHS-compliant in some legacy variants | Choose only if SSOP footprint already exists in production and lead-free compliance is verified. |
Compared with SN74LVC240APW and 74LVC240ADB, the SN74LVC240ADW offers the lowest thermal resistance among common 20-pin packages and maintains full backward compatibility with legacy SOIC-20 assembly processes, making it optimal for industrial upgrades where reliability and manufacturing continuity are prioritized over miniaturization.
Availability
SN74LVC240ADW is available at Aetrix Electronics and suitable for industrial automation backplanes, memory subsystem redriving, hot-swap I/O modules, and legacy 5V-to-3.3V level translation requiring stable component supply across multi-year production cycles.
Supply support for SN74LVC240ADW 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 industrial and automotive ICs.
The SN74LVC240ADW belongs to TI's LVC (Low-Voltage CMOS) logic family, designed specifically for low-voltage, high-speed interfacing in mixed-signal systems where power efficiency, noise immunity, and voltage-domain bridging are critical.
FAQ
What is the maximum input voltage the SN74LVC240ADW can tolerate?
The SN74LVC240ADW accepts input voltages up to 5.5V regardless of VCC level (1.65V–3.6V), enabling direct connection of 5V signals without external clamping or level-shifting circuitry. This tolerance is specified in the Absolute Maximum Ratings table and validated across –40°C to +125°C operation. The SN74LVC240ADW maintains this rating even when VCC is powered down, thanks to integrated input clamp diodes.
Does the SN74LVC240ADW support hot-swap insertion?
Yes, the SN74LVC240ADW supports live insertion via its Ioff feature: when VCC = 0V, all outputs enter high-impedance state with leakage current limited to ±10μA, preventing back-drive into powered system buses. This behavior is guaranteed per JESD78 and confirmed in the Electrical Characteristics table under Ioff test conditions, making the SN74LVC240ADW suitable for modular I/O card designs requiring field-replaceable components.
What is the propagation delay of the SN74LVC240ADW at 2.5V supply?
At VCC = 2.5V and TA = 25°C, the SN74LVC240ADW exhibits a maximum propagation delay (tpd) of 7.8ns, as specified in Section 5.6 Switching Characteristics (–40°C to 85°C). This value applies to both A→Y and OE→Y transitions and is measured with 30pF load and 2.5V ±0.2V supply. The SN74LVC240ADW maintains consistent performance across temperature, with tpd increasing to 7.9ns at +125°C per Section 5.7.
Can unused inputs on the SN74LVC240ADW be left floating?
No, unused inputs on the SN74LVC240ADW must be terminated to either VCC or GND to prevent oscillation, excessive power consumption, and potential latch-up. TI's datasheet explicitly states in Section 5.3 Recommended Operating Conditions that "all unused inputs… must be held at VCC or GND." A 10kΩ pull-up or pull-down resistor is recommended for uncommitted inputs, ensuring stable logic levels without violating the ±5μA input leakage limit specified for the SN74LVC240ADW.
What is the thermal resistance (RθJA) of the SN74LVC240ADW in SOIC package?
The SN74LVC240ADW in DW (SOIC-20) package has a junction-to-ambient thermal resistance (RθJA) of 114.8°C/W, as documented in Section 5.4 Thermal Information. This value assumes standard JEDEC 2S2P test board conditions (2-layer board, 2 × 2 inch copper pours). The SN74LVC240ADW's RθJA is lower than competing TSSOP and SSOP variants, providing superior thermal performance for continuous operation in enclosed industrial enclosures.
SN74LVC240ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- 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:
- 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-SOIC
SN74LVC240ADW FAQ
1.How can I place an order for SN74LVC240ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC240ADW 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 SN74LVC240ADW reliable?
The price and inventory of SN74LVC240ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC240ADW is usually 5 days.
3.What payment methods are accepted for SN74LVC240ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC240ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC240ADW?
SN74LVC240ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC240ADW 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 SN74LVC240ADW?
For technical support, including SN74LVC240ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC240ADW requirements.
6.How does Aetrix verify that SN74LVC240ADW is sourced from the original manufacturer or authorized distributors?
All SN74LVC240ADW 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 SN74LVC240ADW meets industry standards.
7.What is the process for return or replacement of SN74LVC240ADW?
All SN74LVC240ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC240ADW, 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 SN74LVC240ADW part is unused and in its original packaging.
Return procedure for SN74LVC240ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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