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Texas Instruments SN74AHC540PWRG4
- Part No.:
- SN74AHC540PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC540PWRG4.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,675
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Product details
Overview
SN74AHC540PWRG4 from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for bus line driving and memory address register buffering in digital systems. It operates from 2 V to 5.5 V, supports 25 mA per output, features dual active-low output-enable inputs (OE1/OE2), and delivers typical propagation delays of 3.7 ns at 5 V (CL = 15 pF). It is widely deployed in PC, server, and network switch backplane interfaces.
For engineers reviewing the SN74AHC540PWRG4 datasheet, SN74AHC540PWRG4 pinout, SN74AHC540PWRG4 application, or SN74AHC540PWRG4 equivalent, key selection criteria include its dual 3-state control architecture, 20-pin TSSOP package, ±2000-V HBM ESD rating, and compatibility with mixed-voltage logic translation (inputs tolerate up to 5.5 V at any valid VCC).
Technical Context
The SN74AHC540PWRG4 implements eight independent noninverting buffer channels, each with a two-input AND gate controlling 3-state output enable-OE1 and OE2 must both be low for outputs Y1–Y8 to drive; either high forces all outputs into high-impedance. Its CMOS AHC logic family ensures balanced rise/fall times and low dynamic power consumption.
Input overvoltage tolerance (up to 5.5 V) enables level-shifting from higher-voltage domains into 3.3-V or 2.5-V systems without external circuitry. The device's layout-optimized pinout-inputs on one side (pins 1–9), outputs on the opposite side (pins 11–18)-reduces PCB trace crosstalk and simplifies routing in dense bus architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports single-supply operation across 2.5-V, 3.3-V, and 5-V logic domains |
| IOL/IOH | ±8 mA at 5 V - sufficient drive strength for TTL/CMOS loads without external buffers |
| tPLH/tPHL | 3.7 ns max at 5 V, CL = 15 pF - enables reliable timing in sub-100-MHz parallel bus applications |
| ESD Rating (HBM) | ±2000 V - meets industrial handling requirements without additional protection circuitry |
| Input Voltage Tolerance | Up to 5.5 V regardless of VCC - allows safe interfacing with 5-V legacy peripherals in lower-VCC systems |
| Quiescent Current (ICC) | 40 µA max at 5.5 V - minimizes standby power in battery-backed or energy-sensitive designs |
| Thermal Resistance (RθJA) | 116.8 °C/W (TSSOP) - defines maximum power dissipation limit under natural convection cooling |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, thin-profile surface-mount construction optimized for automated assembly and space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-state enable inputs - both must be low to activate outputs; used for bus arbitration or channel grouping |
| 2–9 | A1–A8 | Buffer input terminals - accept logic signals from microcontrollers, FPGAs, or memory controllers |
| 11–18 | Y1–Y8 | Noninverting buffered outputs - drive bus lines, address latches, or peripheral I/O with controlled edge rates |
| 10 | GND | Ground reference - must be low-impedance connection to minimize noise coupling and ensure stable logic thresholds |
| 20 | VCC | Power supply - requires local 0.1-µF ceramic bypass capacitor placed within 2 mm of the pin |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–5.5 V) | Enables interoperability across legacy 5-V and modern low-voltage systems without level shifters |
| Dual independent OE control | Allows partitioning of the eight outputs into two groups (e.g., upper/lower byte) for selective bus isolation |
| Input overvoltage tolerance | Eliminates need for external clamping diodes when interfacing 5-V sensors or switches to 3.3-V hosts |
| Low drive strength (±8 mA) | Reduces output ringing and EMI on unterminated or lightly loaded traces, improving signal integrity |
| High-impedance state leakage (IOZ) | ±2.5 µA max - ensures minimal current draw and voltage perturbation during bus contention or hot-swap events |
Applications
| Server Memory Buffering | PC Peripheral Bus Interface |
|---|---|
Use Scenario: Driving DDR address/control lines between CPU and memory modules in enterprise servers. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates memory controller outputs during refresh cycles and enables multi-drop address bus sharing. Use Value: Dual OE inputs allow synchronized gating of upper/lower address bytes, reducing timing skew and enabling clean bus turnaround. |
Use Scenario: Interfacing USB host controller GPIOs to legacy ISA-style expansion slots in desktop motherboards. IC Role / Device Role / Timing Role: Level-translating buffer translating 3.3-V host logic to 5-V slot signaling while providing bus contention protection. Use Value: 5.5-V-tolerant inputs eliminate external level shifters; low-drive outputs suppress ringing on long, unterminated backplane traces. |
| Network Switch Backplane Driver | Industrial PLC I/O Expansion |
Use Scenario: Buffering control signals (e.g., chip select, write enable) across modular switch fabric cards. IC Role / Device Role / Timing Role: Octal driver with fast 3.7-ns propagation ensures setup/hold compliance across distributed clock domains in multi-board systems. Use Value: TSSOP-20 footprint supports high-density routing; ±2000-V HBM rating withstands field-replacement electrostatic events. |
Use Scenario: Isolating programmable logic controller (PLC) CPU data bus from remote I/O module address decoders. IC Role / Device Role / Timing Role: 3-state buffer enables time-multiplexed access to shared address/data resources across multiple I/O banks. Use Value: Dual OE pins permit independent enable/disable of I/O groupings, supporting flexible scan-based diagnostics and hot-swap reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC541APWR | Lower VCC range (1.65–3.6 V); 24 mA drive; faster tPD (2.5 ns @ 3.3 V) | Optimized for 3.3-V-only systems; not suitable for 5-V tolerant interfaces | Select when operating exclusively at 3.3 V and requiring higher drive or lower propagation delay. |
| 74AC540MTCX | Wider VCC (2–6 V); higher drive (±24 mA); no input overvoltage tolerance beyond VCC | Better for high-speed 5-V buses but lacks 5.5-V input tolerance for mixed-voltage translation | Choose for legacy 5-V designs where input overvoltage safety is not required and higher fanout is needed. |
Compared with SN74LVC541APWR and 74AC540MTCX, the SN74AHC540PWRG4 uniquely balances 5.5-V input tolerance, moderate drive strength for signal integrity, and dual-OE flexibility-making it optimal for mixed-voltage, space-constrained, and ESD-prone industrial and computing interfaces.
Availability
SN74AHC540PWRG4 is available at Aetrix Electronics and suitable for server backplanes, PC motherboard I/O expansion, and network switch control plane applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74AHC540PWRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-reliability interface IC design and manufacturing.
The SN74AHC540PWRG4 belongs to TI's AHC logic family-engineered for low-power, high-speed bus interface applications in computing, communications, and industrial control systems where voltage flexibility and signal integrity are critical.
FAQ
What is the function of OE1 and OE2 on the SN74AHC540PWRG4?
The SN74AHC540PWRG4 uses two active-low output-enable inputs (OE1 and OE2) that form a two-input AND gate controlling all eight outputs. Both OE1 and OE2 must be low for Y1–Y8 to drive their respective inputs (A1–A8); if either is high, all outputs enter high-impedance state. This enables grouped bus control-for example, using OE1 for upper-byte and OE2 for lower-byte isolation in memory systems.
Does the SN74AHC540PWRG4 support 5-V input signals when powered at 3.3 V?
Yes-the SN74AHC540PWRG4 inputs are overvoltage tolerant up to 5.5 V regardless of VCC. When powered at 3.3 V, it safely accepts 5-V logic signals without damage or level-shifting circuitry, making it ideal for interfacing legacy 5-V peripherals to modern 3.3-V microcontrollers or FPGAs.
What is the maximum output current per pin for the SN74AHC540PWRG4?
The SN74AHC540PWRG4 supports ±8 mA per output at VCC = 5 V, and ±4 mA at VCC = 3.3 V. Total continuous output current must not exceed ±75 mA across all pins. Exceeding these limits risks thermal overstress or parametric shift, especially in sustained drive conditions.
Can the SN74AHC540PWRG4 be used in automotive applications?
The standard SN74AHC540PWRG4 is a catalog-grade device rated for –40°C to +125°C operation but is not AEC-Q100 qualified. For automotive use, TI offers the pin-compatible SN74AHC540QDRQ1-a qualified variant with enhanced reliability testing, extended temperature validation, and automotive-specific traceability and documentation.
What package type does SN74AHC540PWRG4 use, and what are its key mechanical dimensions?
The SN74AHC540PWRG4 uses a 20-pin TSSOP (PW) package with nominal dimensions of 6.50 mm × 4.40 mm and 0.65 mm lead pitch. Its thin profile (1.2 mm max height) supports high-density PCB layouts and automated SMT assembly, and it carries a JEDEC-standard Level-1 moisture sensitivity rating for unlimited floor life at ambient conditions.
SN74AHC540PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHC540PWRG4 FAQ
1.How can I place an order for SN74AHC540PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC540PWRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74AHC540PWRG4 reliable?
The price and inventory of SN74AHC540PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC540PWRG4 is usually 5 days.
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SN74AHC540PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC540PWRG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74AHC540PWRG4?
For technical support, including SN74AHC540PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC540PWRG4 requirements.
6.How does Aetrix verify that SN74AHC540PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC540PWRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74AHC540PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHC540PWRG4?
All SN74AHC540PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC540PWRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74AHC540PWRG4 part is unused and in its original packaging.
Return procedure for SN74AHC540PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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