SN74BCT541ADWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74BCT541ADWG4 is an octal 3-state buffer and line driver with dual active-low output enables, sinking 64 mA per output in a 20-pin SOIC package. It operates from 4.5V to 5.5V and provides high-drive BiCMOS outputs compatible with TTL and CMOS logic. Available in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74BCT541ADWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8 unidirectional buffer channels with 64 mA sink current per output for driving heavy capacitive or resistive bus loads at 5V
- Dual active-low OE pins allow independent enabling of all 8 outputs or half-bus control in multiplexed data bus designs
- BiCMOS BCT-family output stage achieves TTL-compatible logic levels with CMOS low-power static consumption
- 3-state outputs prevent bus contention during data bus sharing between multiple bus masters in 8-bit and 16-bit processor systems
Applications
The SN74BCT541ADWG4 is used as an address or data bus buffer in 8-bit and 16-bit microprocessor memory systems, isolating the CPU bus from high-capacitance SRAM, Flash, and peripheral address buses. Its 64 mA sink current and 3-state outputs also suit FPGA I/O expansion designs where the FPGA drives one bus segment and the buffer drives an external 50Ω terminated backplane. Industrial control backplanes and VME bus cards use it to extend TTL-level control signals across board-to-board connectors with capacitive loads up to 50 pF.
Specifications
| YTEOL | 0 |
| Additional Feature | WITH DUAL OUTPUT ENABLE |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | BCT/FBT |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.064A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 72mA |
| Prop. Delay@Nom-Sup | 8.2ns |
| Propagation Delay (tpd) | 8.2ns |
| 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 | BICMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| 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 SN74BCT541ADWG4:
Bus Driver, BCT/FBT Series, 10-Func, 8-Bit, True Output, BICMOS, PDSO20
Frequently Asked Questions
How does the dual OE pin architecture of the SN74BCT541ADWG4 support bus multiplexing in embedded systems?
The SN74BCT541ADWG4 provides two independent active-low output enable pins (OE1 and OE2) that must both be asserted low to enable all 8 output channels. This dual-enable structure allows a system controller to gate the entire 8-bit bus in two separate logic domains — for example, one OE driven by address decode logic and the other by a read/write control signal — preventing bus contention without requiring additional AND-gate logic. Pulling either OE high forces all 8 outputs to the high-impedance 3-state condition within 13 ns propagation delay.
What drive current does each output channel of the SN74BCT541ADWG4 provide, and how does this compare to standard CMOS buffers?
Each output channel of the SN74BCT541ADWG4 sinks up to 64 mA (IOL) and sources 15 mA (IOH), versus 8 mA typical for standard 74HC-series CMOS buffers. The 64 mA sink capability allows driving a 50Ω transmission line to ground with a valid logic-low output voltage below 0.5V, supporting terminated backplane buses that 74HC logic cannot drive. The BiCMOS output stage maintains TTL-compatible VOL below 0.5V and VOH above 2.4V across the full 4.5V to 5.5V supply range and -40°C to +85°C industrial temperature range.
For a PCB revision that must fit into a 20-pin footprint, is the SN74BCT541ADWG4 compatible with the older 74BCT541 footprint?
Yes. The SN74BCT541ADWG4 uses the standard 20-pin SOIC (R-PDSO-G20) package with 1.27 mm pin pitch and 7.5 mm body width, which is pin-compatible with any legacy 74BCT541 or 74F541 device in the same 20-pin SOIC footprint. The G4 suffix in the MPN indicates a green, halogen-free packaging qualification per JESD-609 code e4, but the die pinout, electrical characteristics, and pad dimensions are identical to earlier 74BCT541 variants, allowing a drop-in board replacement without PCB layout changes.
How fast does the SN74BCT541ADWG4 propagate a logic transition for use in a 25 MHz processor address bus?
The SN74BCT541ADWG4 achieves a maximum propagation delay of 8 ns from input to output (tpd A to Y) at 5V supply and 25°C with a 50 pF load, well within the address setup time requirements of most 25 MHz bus cycles that allow 20 ns to 40 ns for bus driver propagation. The output enable propagation delay from OE assertion to active output is 13 ns maximum, compatible with a 25 MHz read cycle where chip-select-to-output-enable assert time typically exceeds 15 ns in standard memory controller state machines.
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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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