SN74AHCT240DBRE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74AHCT240DBRE4 is an octal buffer and line driver IC from Texas Instruments with 3-state outputs and active-low output enable, in the AHCT logic family operating at 4.5 V to 5.5 V. It delivers 8 mA output drive current and is suited for bus interfacing and signal buffering applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74AHCT240DBRE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Octal (8-channel) unidirectional buffer with 3-state outputs
- Active-low output enable control for easy bus sharing
- AHCT logic family operating at 4.5 V to 5.5 V supply
- Output sink current of 8 mA for driving bus lines
- 50 pF load capacitance rating for robust signal integrity
- 20-pin SOIC package in RoHS-compliant e4 finish
Applications
The SN74AHCT240DBRE4 is commonly used as a bus driver and address/data buffer in microprocessor and microcontroller systems, isolating high-capacitance bus lines from sensitive control logic. It serves in memory interface circuits, FPGA I/O expansion, and embedded systems where 8 logic signals require buffering at 5 V. The 3-state output feature makes it ideal for shared-bus architectures in industrial controllers and communication boards.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | AHCT/VHCT/VT |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.008A |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SSOP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.04mA |
| Prop. Delay@Nom-Sup | 9.5ns |
| Propagation Delay (tpd) | 9.5ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74AHCT240DBRE4:
suggested
suggested
suggested
Bus Driver, AHCT/VHCT/VT Series, 2-Func, 4-Bit, True Output, CMOS, PDSO20
Frequently Asked Questions
How many channels does the SN74AHCT240DBRE4 buffer, and what supply voltage does it require?
The SN74AHCT240DBRE4 provides 8 independent buffered output channels (octal) and operates from a supply voltage of 4.5 V to 5.5 V. Its active-low enable inputs allow the outputs to be placed in a high-impedance 3-state mode for bus sharing across multiple drivers.
Which bus architectures benefit from using the SN74AHCT240DBRE4 as a line driver?
The SN74AHCT240DBRE4 is well suited for address and data bus buffering in 8-bit microcontroller systems, memory modules, and FPGA I/O expansion boards. Its 8 mA sink current and 3-state outputs support up to 8 devices sharing the same bus without contention at 5 V logic levels.
Is the SN74AHCT240DBRE4 compatible with CMOS and TTL input logic levels?
Yes, the AHCT logic family in the SN74AHCT240DBRE4 accepts CMOS-level inputs (VIH ≥ 3.15 V) while outputting standard TTL-compatible voltage levels at 5 V supply. This makes it a bridge device in mixed-logic designs combining 3.3 V CMOS outputs driving 5 V TTL buses, supporting signal translation across 8 lines.
What package does the SN74AHCT240DBRE4 use and how many pins does it have?
The SN74AHCT240DBRE4 is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package, measuring approximately 12.8 mm × 7.5 mm. The SOIC-20 footprint is standard across AHCT-family octal buffers, allowing easy drop-in replacement with compatible 74AHCT240 devices.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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