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Texas Instruments SN74AHC540PW
- Part No.:
- SN74AHC540PW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC540PW.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
SN74AHC540PW from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for bus line driving and memory address register buffering in 2V–5.5V systems. It features dual active-low output-enable inputs (OE1, OE2), 20-pin TSSOP packaging, ±25mA output drive per channel, and supports down-translation with 5.5V-tolerant inputs.
For engineers reviewing the SN74AHC540PW datasheet, SN74AHC540PW pinout, SN74AHC540PW application, or SN74AHC540PW equivalent, this page delivers verified electrical specs, thermal metrics, switching timing at 3.3V/5V, 3-state control behavior, and real-world layout guidance for high-density PCBs.
Technical Context
The SN74AHC540PW implements eight independent noninverting buffers, each with a two-input AND gate controlling 3-state output enable-OE1 and OE2 must both be low to activate outputs. Its CMOS AHC logic family ensures balanced rise/fall times and low dynamic power consumption.
Input voltage tolerance up to 5.5V enables interfacing with higher-voltage logic while operating at VCC = 2V–5.5V; propagation delays range from 3.7ns (5V, CL=15pF) to 9.5ns (3.3V, CL=50pF), with guaranteed operation from –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - Enables single-supply operation across legacy 3.3V and modern mixed-voltage systems. |
| Output Drive | ±25 mA per output - Sufficient to drive standard TTL loads and moderate-capacitance buses without external buffering. |
| Propagation Delay | 3.7 ns (5V, CL=15pF) - Supports high-speed data transfer in memory and peripheral interfaces up to ~100 MHz. |
| Input Voltage Tolerance | Up to 5.5 V - Allows direct connection to 5V logic signals even when VCC = 3.3V or 2.5V (level translation). |
| ESD Rating | ±2000 V HBM - Meets industrial handling requirements without additional protection circuitry. |
| Operating Temperature | –40°C to +125°C - Qualified for extended-temperature industrial and computing environments. |
| Power Dissipation Cap. | 12 pF (typical) - Low internal capacitance minimizes dynamic power draw in high-frequency toggle applications. |
Pinout & Package
TSSOP-20 package (6.50 mm × 4.40 mm body size), surface-mount, lead-free (NIPDAU), moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-state enable inputs - Both must be low to assert outputs; either high places all eight Y outputs in high-Z. |
| 2–9 | A1–A8 | Buffer input terminals - Noninverting logic inputs accepting 0–5.5V; internally tied to corresponding Y outputs. |
| 10 | GND | Ground reference - Must be connected to system ground plane for stable noise margin and thermal performance. |
| 11–18 | Y8–Y1 | Buffer output terminals - Provide inverted logic state relative to A inputs only when enabled; otherwise high-impedance. |
| 20 | VCC | Positive supply rail - Requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin for EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | Operates from 2V to 5.5V - Eliminates need for separate voltage translators in multi-rail systems. |
| 5.5V-Tolerant Inputs | Accepts 5V logic signals at any valid VCC - Enables seamless interface between 5V peripherals and 3.3V/2.5V controllers. |
| Low-Drive Output Architecture | Controlled edge rates minimize overshoot/undershoot - Reduces signal integrity issues on unterminated traces and light loads. |
| Thermal Performance | RθJA = 116.8°C/W (TSSOP) - Enables reliable operation in compact enclosures without forced air cooling. |
| Bus-Friendly Layout | Inputs and outputs on opposite package sides - Simplifies layer routing and reduces crosstalk in dense PCB layouts. |
Applications
| Server Memory Interfaces | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Driving address lines between CPU and DDR3/DDR4 memory modules in rack-mounted servers. IC Role / Device Role / Timing Role: Noninverting buffer isolating processor address bus from memory controller; provides current gain and 3-state isolation during refresh cycles. Use Value: Prevents bus contention during memory arbitration; 3.7ns delay at 5V ensures timing compliance with JEDEC tAA specifications. |
Use Scenario: Expanding digital input/output capacity in programmable logic controller backplanes with mixed-voltage field devices. IC Role / Device Role / Timing Role: Level-translating buffer between 3.3V FPGA I/O banks and 5V sensor/actuator interfaces. Use Value: 5.5V-tolerant inputs eliminate external level shifters; ±25mA drive supports direct connection to optocoupler inputs and relay drivers. |
| Network Switch Control Planes | Medical Diagnostic Equipment Backplanes |
Use Scenario: Isolating configuration registers and status lines between management MCU and multi-port Ethernet PHYs. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling shared control bus access among multiple PHYs via OE-controlled 3-state arbitration. Use Value: Dual OE pins allow independent enable/disable of two four-channel groups - simplifies hierarchical bus arbitration without external logic. |
Use Scenario: Interfacing microcontroller GPIOs to analog front-end modules and display controllers in portable ultrasound and ECG units. IC Role / Device Role / Timing Role: Address/data latch buffer for SPI/I²C peripheral expansion; provides ESD-hardened signal path per IEC 61000-4-2 Level 4. Use Value: ±2000V HBM rating meets medical EMC immunity requirements; low 12pF Cpd minimizes loading on sensitive analog measurement paths. |
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 |
|---|---|---|---|
| SN74LVC541APW | Lower VCC range (1.65V–3.6V); 24mA drive; 3.3V-only optimized; no 5.5V input tolerance. | Suitable only for pure 3.3V systems; cannot accept 5V inputs without clamping or external protection. | Select when operating exclusively at 3.3V and lower power consumption is prioritized over voltage flexibility. |
| 74AHC244PW | Same AHC family, identical 2V–5.5V range and 5.5V-tolerant inputs; differs in enable architecture (single OE vs dual OE). | Lacks independent OE1/OE2 grouping - all eight outputs share one enable, reducing bus segmentation capability. | Choose when simplified control logic suffices and dual-group 3-state arbitration is unnecessary. |
Compared with SN74LVC541APW and 74AHC244PW, the SN74AHC540PW uniquely combines dual independent output-enable control, full 5.5V input tolerance, and industrial temperature range - making it optimal for mixed-voltage bus arbitration where group-level isolation and legacy interface compatibility are required.
Availability
SN74AHC540PW is available at Aetrix Electronics and suitable for server memory interfaces, industrial PLC I/O expansion, and network switch control planes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC540PW 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHC540PW belongs to TI's AHC logic family, engineered for low-power, high-noise-immunity digital interfacing in space-constrained, thermally demanding applications such as computing infrastructure and factory automation.
FAQ
What is the maximum output current per pin for SN74AHC540PW?
The SN74AHC540PW supports ±25 mA continuous output current per Y pin under recommended operating conditions. This rating applies individually to each of the eight outputs and is validated across the full –40°C to +125°C temperature range. Exceeding this limit risks parametric shift or long-term reliability degradation; total device current (summed across all outputs) must not exceed ±75 mA.
Does SN74AHC540PW support 5V logic inputs when powered at 3.3V?
Yes, SN74AHC540PW accepts input voltages up to 5.5 V regardless of VCC setting - including when VCC = 3.3 V. This 5V-tolerant input capability enables direct interfacing with legacy 5V peripherals without external level-shifting circuitry, a key design advantage confirmed in Section 7.3 of the official datasheet.
How does the dual output-enable architecture of SN74AHC540PW improve bus design?
The SN74AHC540PW features two independent active-low output-enable inputs (OE1 and OE2), allowing eight outputs to be split into two groups of four. This enables selective 3-state control - for example, isolating upper/lower address bytes or separating control/data lanes - reducing bus contention and simplifying arbitration logic compared to single-OE alternatives like 74AHC244PW.
What is the typical propagation delay of SN74AHC540PW at 5V supply?
At VCC = 5 V ± 0.5 V and CL = 15 pF, the SN74AHC540PW exhibits a typical propagation delay (tPLH/tPHL) of 3.7 ns, with a maximum of 7 ns over temperature. This value is measured from A input to corresponding Y output and is critical for timing closure in high-speed memory and peripheral interfaces.
Is SN74AHC540PW RoHS compliant and what is its moisture sensitivity level?
Yes, SN74AHC540PW is RoHS compliant (lead-free NIPDAU finish) and rated MSL Level-1 (unlimited floor life) per JEDEC J-STD-020, with peak reflow temperature of 260°C. This allows standard SMT assembly without dry-packaging or baking requirements, streamlining manufacturing for high-volume industrial and computing applications.
SN74AHC540PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
SN74AHC540PW FAQ
1.How can I place an order for SN74AHC540PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC540PW 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 SN74AHC540PW reliable?
The price and inventory of SN74AHC540PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC540PW is usually 5 days.
3.What payment methods are accepted for SN74AHC540PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC540PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC540PW?
SN74AHC540PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC540PW 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 SN74AHC540PW?
For technical support, including SN74AHC540PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC540PW requirements.
6.How does Aetrix verify that SN74AHC540PW is sourced from the original manufacturer or authorized distributors?
All SN74AHC540PW 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 SN74AHC540PW meets industry standards.
7.What is the process for return or replacement of SN74AHC540PW?
All SN74AHC540PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC540PW, 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 SN74AHC540PW part is unused and in its original packaging.
Return procedure for SN74AHC540PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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