SN74AHCT540DWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74AHCT540DWG4 is an octal inverting 3-state buffer and line driver in 20-pin SOIC package from Texas Instruments AHCT family. Supports 5 V CMOS inputs, 50 pF load capacitance, and dual active-low output enables. From $0.45 in stock worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74AHCT540DWG4 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
What are the key features of SN74AHCT540DWG4?
- 8-channel inverting 3-state buffer with dual active-low output enables allows shared bus architectures with independent bank control
- AHCT technology accepts 5 V CMOS-level inputs while driving TTL-compatible outputs at high speed for mixed 3.3 V/5 V system interfaces
- 20-pin SOIC package with 50 pF rated load capacitance maintains signal integrity on backplane and data bus lines at standard clock frequencies
What is SN74AHCT540DWG4 used for?
SN74AHCT540DWG4 is used as a bus interface buffer in microprocessor data bus isolation, memory expansion, and address demultiplexing circuits requiring 8-channel 3-state driving capability. It is well-suited for industrial control boards and embedded systems where 5 V CMOS signals must be buffered and inverted across PCB segments with controlled impedance lines.
What are the specifications of SN74AHCT540DWG4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | WITH DUAL OUTPUT ENABLE |
| 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 | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | INVERTED |
| 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) | 0.04mA |
| Prop. Delay@Nom-Sup | 10ns |
| Propagation Delay (tpd) | 10ns |
| 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 | 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 |
Where can I find the SN74AHCT540DWG4 datasheet?
SN74AHCT540DWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74AHCT540DWG4?
Compatible alternatives and drop-in replacements for SN74AHCT540DWG4:
Bus Driver, AHCT/VHCT/VT Series, 8-Func, 8-Bit, Inverted Output, CMOS, PDSO20
Bus Driver, AHCT/VHCT/VT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20
Bus Driver, AHCT/VHCT/VT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20
Frequently Asked Questions
What logic family is SN74AHCT540DWG4 and what voltage levels does it accept and drive?
SN74AHCT540DWG4 belongs to the AHCT family, accepting 5 V CMOS input levels while producing TTL-compatible output levels. It operates from a 4.5 V to 5.5 V supply and can drive lines loaded up to 50 pF, making it ideal for interfacing 5 V CMOS logic to TTL or mixed-voltage bus architectures.
How do the dual output-enable pins on SN74AHCT540DWG4 simplify bus management in multi-master designs?
SN74AHCT540DWG4 provides two independent active-low output enable inputs (OE1 and OE2), both of which must be low for outputs to be active. In an 8-bit bidirectional bus with multiple bus masters, this dual-enable scheme allows bus arbitration logic to disable all 8 outputs simultaneously with a single active-low signal per bank, preventing bus contention.
Is SN74AHCT540DWG4 a suitable replacement for 74HC540 in a 5 V legacy system?
SN74AHCT540DWG4 is pin-compatible with 74HC540 in the 20-pin SOIC package and adds improved input threshold compatibility for 5 V CMOS signals. Switching from 74HC540 to AHCT540 preserves inverting 3-state buffer behavior while improving noise margin at CMOS input thresholds on 5 V rails in legacy industrial and consumer systems.
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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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