SN74HC540PWTG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74HC540PWTG4 is an 8-channel inverting 3-state CMOS bus driver from Texas Instruments in the HC logic family. It features two active-low output enable inputs, 6 mA sink current, and operates from 2 V to 6 V supply in a 20-pin TSSOP package, ideal for inverting bus buffering in 3.3 V and 5 V digital systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC540PWTG4 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
- 8-channel inverting bus driver with 3-state outputs and dual active-low output enable control
- HC logic family: 2 V to 6 V supply compatible with 3.3 V and 5 V CMOS digital systems
- Low output sink current of 6 mA suitable for standard CMOS and moderate TTL-compatible loads
- 50 pF load capacitance support across all 8 channels for medium-distance bus driving
- 20-pin TSSOP (PW package) in tape-and-reel for automated surface-mount assembly
Applications
The SN74HC540PWTG4 is used in microcontroller output bus buffering, memory address driving with signal inversion, and logic level inversion in 3.3 V and 5 V embedded systems and industrial controllers. It is also commonly applied in PCB bus isolation, where inverting the data bus polarity is needed between subsystems, and in address demultiplexing in legacy microprocessor-based designs.
Specifications
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | HC/UH |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.006A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP20,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 25ns |
| Propagation Delay (tpd) | 188ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| 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 SN74HC540PWTG4:
Bus Driver, HC/UH Series, 1-Func, 8-Bit, Inverted Output, CMOS, PDSO20
Frequently Asked Questions
What is the difference between the SN74HC540 and the SN74HC541?
The SN74HC540 is an inverting 8-bit bus driver (outputs are logically inverted from inputs), while the SN74HC541 is the non-inverting version. Both have the same pinout and dual active-low enable configuration, making them interchangeable in PCB layouts when inversion can be accommodated in firmware.
What supply voltage range does the SN74HC540PWTG4 operate on?
The SN74HC540PWTG4 operates from 2 V to 6 V supply voltage, compatible with 3.3 V CMOS and 5 V TTL-compatible logic levels in the HC family, and guaranteed to meet all specifications across this full range at ambient temperatures from -40°C to 85°C.
How are the output enables configured on the SN74HC540PWTG4?
The SN74HC540PWTG4 has two active-low output enable pins (OE1 and OE2), both of which must be LOW to enable all 8 output channels. If either OE pin is HIGH, all outputs enter the high-impedance 3-state mode, allowing bus sharing with other drivers.
What package is the SN74HC540PWTG4 available in?
The SN74HC540PWTG4 is packaged in a 20-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, supplied in tape-and-reel. The G4 suffix confirms RoHS-compliant lead-free construction for use in environmentally regulated production.
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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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