SN74LVC240A - Octal Buffer/Driver with 3-State Outputs | TI
MPN: SN74LVC240A β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.45 | $0.45 |
| 10 | $0.38 | $3.80 |
| 100 | $0.29 | $29.00 |
| 500 | $0.24 | $120.00 |
| 1,000 | $0.19 | $190.00 |
Drop-in alternatives for SN74LVC240A β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74LVC240APW
β Drop-Inπ Reference alternative (not in catalog)
SN74LVC240ADWR
β Drop-Inπ Reference alternative (not in catalog)
SN74LVC240ANSR
β Drop-Inπ Reference alternative (not in catalog)
SN74LVC244APWR
β‘ Same Packageβ In Stock
$0.18 / Unit
View Datasheet β74LVC240AD
β Drop-Inπ Reference alternative (not in catalog)
MC74LVC240ADWG
β Drop-Inπ Reference alternative (not in catalog)
SN74LVC240A Maximum Ratings & Electrical Characteristics
| Number of Channels | 8 |
| Supply Voltage Range | 1.65 V to 3.6 V |
| Input Voltage Tolerance | 5.5 V |
| Propagation Delay (tpd) | 3.3 ns typical at 3.3 V |
| Output Type | 3-State |
| Logic Family | LVC |
| Output Current | [DATA_NEEDED: Output current] |
| Operating Temperature Range | -40Β°C to 85Β°C |
| Package Type | SOIC-20, TSSOP-20, SSOP-20 |
| Mounting Type | Surface Mount |
| Number of Elements | 2 |
| Bits per Element | 4 |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| MSL Level | [DATA_NEEDED: MSL level] |
SN74LVC240A Pin Configuration
| Pin 1 | 1OE β Output enable for bank 1 (active low) |
| Pin 2 | 1A0 β Input for channel 0 of bank 1 |
| Pin 3 | 1Y0 β Output for channel 0 of bank 1 |
| Pin 4 | 1A1 β Input for channel 1 of bank 1 |
| Pin 5 | 1Y1 β Output for channel 1 of bank 1 |
| Pin 6 | 1A2 β Input for channel 2 of bank 1 |
| Pin 7 | 1Y2 β Output for channel 2 of bank 1 |
| Pin 8 | 1A3 β Input for channel 3 of bank 1 |
| Pin 9 | 1Y3 β Output for channel 3 of bank 1 |
| Pin 10 | GND β Ground |
| Pin 11 | 2Y3 β Output for channel 3 of bank 2 |
| Pin 12 | 2A3 β Input for channel 3 of bank 2 |
| Pin 13 | 2Y2 β Output for channel 2 of bank 2 |
| Pin 14 | 2A2 β Input for channel 2 of bank 2 |
| Pin 15 | 2Y1 β Output for channel 1 of bank 2 |
| Pin 16 | 2A1 β Input for channel 1 of bank 2 |
| Pin 17 | 2Y0 β Output for channel 0 of bank 2 |
| Pin 18 | 2A0 β Input for channel 0 of bank 2 |
| Pin 19 | 2OE β Output enable for bank 2 (active low) |
| Pin 20 | VCC β Power supply |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SN74LVC240A is suitable for 6 applications: Memory Address Drivers, Clock Distribution, Bus-Oriented Receivers/Transmitters, Signal Buffering in Mixed-Voltage Systems, Test and Measurement Equipment, Industrial Control Systems.
Memory Address Drivers
The SN74LVC240A is designed to drive memory address lines with its 3-state outputs and high drive capability. Its low propagation delay of 3.3 ns ensures fast address setup times, while the 3-state outputs allow multiple memory banks to share the same address bus without contention. The device operates at 1.65V to 3.6V, making it compatible with modern low-voltage memory interfaces. The inverting outputs can be used to generate complementary address signals if needed. The 50pF load capability is sufficient for short PCB traces to memory devices. This application benefits from the device's high noise immunity and low power consumption, ensuring reliable operation in dense memory systems.
Recommended
Clock Distribution
In clock distribution, the SN74LVC240A buffers clock signals to multiple loads while maintaining signal integrity. Its 3.3ns propagation delay is consistent across channels, minimizing clock skew. The 3-state outputs allow disabling unused clock branches to save power. The device supports 1.65V to 3.6V operation, matching common logic levels. The 5.5V input tolerance allows interfacing with legacy 5V clock sources. The low output ground bounce (VOLP) ensures clean clock edges, reducing jitter. This makes it suitable for distributing clocks in FPGA-based systems, microprocessors, and communication equipment.
Recommended
Bus-Oriented Receivers/Transmitters
The SN74LVC240A is ideal for bus-oriented receivers and transmitters due to its 3-state outputs and high drive capability. It can isolate bus segments when disabled, preventing data corruption. The device operates at 1.65V to 3.6V, making it compatible with various bus voltage levels. Its 5.5V input tolerance allows connection to 5V buses without level shifters. The fast propagation delay supports high-speed data transfer. The two banks of four drivers each with independent enable pins provide flexible bus control. This application is common in industrial control, telecommunications, and computer systems.
Recommended
Signal Buffering in Mixed-Voltage Systems
The SN74LVC240A buffers signals between 3.3V and 5V logic domains thanks to its 5.5V input tolerance. It can drive 5V loads while operating from a 3.3V supply, simplifying level translation. The inverting outputs can be used to invert logic levels if required. The device's low power consumption is beneficial in battery-powered mixed-voltage systems. Its 3-state outputs allow multiple sources to share a bus. This application is common in interfacing sensors, microcontrollers, and legacy peripherals. The 50pF load capability is adequate for short interconnections.
Recommended
Test and Measurement Equipment
In test and measurement equipment, the SN74LVC240A provides buffering for control signals and data buses. Its fast propagation delay ensures accurate timing in automated test systems. The 3-state outputs allow multiple instruments to share a common bus. The device's wide operating voltage range supports various logic levels used in test equipment. The low output noise (VOLP) maintains signal integrity in sensitive measurements. The compact SOIC-20 package fits space-constrained designs. This application benefits from the device's reliability and long-term availability.
Recommended
Industrial Control Systems
The SN74LVC240A is used in industrial control systems for buffering control signals between PLCs, sensors, and actuators. Its 3-state outputs allow safe bus sharing in multi-drop configurations. The device operates over -40Β°C to 85Β°C, suitable for industrial environments. The 5.5V input tolerance enables interfacing with 24V logic levels through resistors. The fast propagation delay supports real-time control loops. The low power consumption reduces heat in enclosed cabinets. This application requires high reliability, which the SN74LVC240A provides with its robust CMOS design.
Recommended
Recommended Products Summary
Engineering reference data for SN74LVC240A β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74LVC240APW | SN74LVC240ADWR | SN74LVC244APWR | 74LVC240AD | MC74LVC240ADWG |
|---|---|---|---|---|---|---|
| Package | SOIC-20, TSSOP-20, SSOP-20 | TSSOP-20 | SOIC-20 | TSSOP-20 | SOIC-20 | SOIC-20 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors | onsemi |
| Output Type | Inverting | Inverting | Inverting | Non-inverting | Inverting | Inverting |
| Supply Voltage Range | 1.65V to 3.6V | 1.65V to 3.6V | 1.65V to 3.6V | 1.65V to 3.6V | 1.65V to 3.6V | 1.65V to 3.6V |
| Input Voltage Tolerance | 5.5V | 5.5V | 5.5V | 5.5V | 5.5V | 5.5V |
| Propagation Delay (tpd) | 3.3ns typical | 3.3ns typical | 3.3ns typical | 3.3ns typical | 3.3ns typical | 3.3ns typical |
| Number of Channels | 8 | 8 | 8 | 8 | 8 | 8 |
| Operating Temperature Range | -40Β°C to 85Β°C | -40Β°C to 85Β°C | -40Β°C to 85Β°C | -40Β°C to 85Β°C | -40Β°C to 85Β°C | -40Β°C to 85Β°C |
Key Differentiators
- Inverting outputs (vs SN74LVC244APWR)
- 5.5V input tolerance (vs 74LVC240AD)
- Wide supply range (vs MC74LVC240ADWG)
Design Notes
Place decoupling capacitors (0.1uF and 10uF) close to the VCC pin to minimize power supply noise. Ensure a solid ground plane for return currents. Keep traces short to reduce parasitic inductance and maintain signal integrity.
Do not exceed the maximum capacitive load of 50pF on outputs to meet datasheet specifications. Larger loads may cause timing violations. Also, ensure that the output enable pins are properly pulled up or down to avoid floating outputs.
The SN74LVC240A has low power consumption, but in high-speed switching applications, ensure adequate airflow or copper area for heat dissipation. The SOIC-20 package has a thermal resistance of approximately 100Β°C/W; keep junction temperature below 125Β°C.
Compliance Information
RoHS compliant per TI product page. AEC-Q100 not applicable for standard version.
