SN74BCT540ANS Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74BCT540ANS is an octal bus buffer and line driver with 3-state outputs and inverting logic in an SOP package. Key specs: 8 inverting buffers, BCT-family BiCMOS technology, 3-state output enable, 20-pin SOIC. Available from stock worldwide.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- SN74BCT540ANS Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74BCT540ANS?
- Octal inverting 3-state buffer with 8 output channels for high-drive bus expansion
- BCT BiCMOS technology provides TTL-compatible inputs with CMOS-speed switching for fast data bus applications
- Active-low output enable control simplifies bidirectional bus arbitration and isolating bus segments
- 20-pin SOP (small-outline) package balances lead count and board area for compact logic designs
- Wide operating temperature range suitable for industrial and commercial bus driver applications
What is SN74BCT540ANS used for?
The SN74BCT540ANS serves as an octal inverting bus buffer in microprocessor data bus expansion circuits, memory interfaces, and backplane drivers where high-drive 3-state outputs are needed to fan out signals across multiple loads. It is also used in industrial PLC I/O modules and communications equipment where BCT BiCMOS technology provides the TTL input compatibility and CMOS-level drive strength needed for reliable bus operation at standard logic voltages.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the SN74BCT540ANS datasheet?
SN74BCT540ANS Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74BCT540ANS?
Compatible alternatives and drop-in replacements for SN74BCT540ANS:
Bus Driver, BCT/FBT Series, 8-Func, 8-Bit, Inverted Output, BICMOS, PDSO20
Frequently Asked Questions
How many buffer channels does SN74BCT540ANS provide, and what output type does each use?
The SN74BCT540ANS contains 8 inverting buffer channels, each with a 3-state output that can be driven high, low, or placed in a high-impedance state. The 3-state outputs are controlled by an active-low output enable pin, allowing the device to be disconnected from the bus without signal contention when multiple drivers share the same 8-bit data bus.
For a high-speed memory interface board, what switching advantage does the BCT technology in SN74BCT540ANS offer?
The SN74BCT540ANS uses BiCMOS BCT technology, which combines bipolar transistor output drive with CMOS logic for TTL-compatible input thresholds and faster propagation delays than standard CMOS buffers. This makes it suitable for memory address and data bus buffering at clock frequencies where standard 74LS or 74HC parts would introduce excessive propagation delay in a 20-pin SOIC package.
In a multi-master bus design, how does the 3-state output of SN74BCT540ANS prevent bus conflicts?
Each of the 8 outputs on the SN74BCT540ANS can be independently tri-stated via the active-low output enable, putting all 8 outputs simultaneously into high-impedance mode. This prevents current contention when two bus masters attempt to drive the same shared bus simultaneously, making the SN74BCT540ANS a standard choice for arbitrated 8-bit data buses in microprocessor and FPGA systems.
What package does SN74BCT540ANS use, and is it suitable for automated SMT assembly?
The SN74BCT540ANS is housed in a 20-pin SOP (small-outline package) which is fully compatible with standard SMT pick-and-place and reflow soldering assembly processes. The SOIC body dimensions comply with JEDEC standards, making it interchangeable with other 20-pin SOP logic devices and supportable by most SMT assembly equipment without tooling changes.
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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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