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Nexperia USA Inc. 74HCT540PWJ
- Part No.:
- 74HCT540PWJ
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HCT540PWJ.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,084
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Product details
Overview
74HCT540PWJ from Nexperia is an octal inverting 3-state buffer/line driver IC used for bus interfacing and signal isolation in digital systems. It features dual active-low output enables (OE1, OE2), TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), ±6 mA output drive capability, and operates across -40 °C to +125 °C. It is commonly deployed in microcontroller peripheral expansion and memory address/data bus buffering.
For engineers reviewing the 74HCT540PWJ datasheet, 74HCT540PWJ pinout, 74HCT540PWJ application, or 74HCT540PWJ equivalent, key selection considerations include its TTL-level input compatibility, 3-state output control timing (ten = 35 ns max, tdis = 35 ns max at VCC = 4.5 V), propagation delay (tpd = 24 ns typ), thermal performance in TSSOP20 package, and industrial temperature range support.
Technical Context
The 74HCT540PWJ implements eight identical inverting buffer circuits with independent 3-state control via two active-low enable inputs. Its TTL-compatible inputs allow direct interfacing with legacy 5 V logic families without level translation, while CMOS output stages provide rail-to-rail swing and high noise immunity.
Each output transitions between active LOW/HIGH states and high-impedance OFF-state based on the logical AND of OE1 and OE2. Input clamp diodes permit safe overvoltage operation when current-limiting resistors are used, supporting robust I/O protection in mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible inputs, CMOS outputs; enables direct connection to 5 V microcontrollers and FPGAs |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V system rails; avoids under-voltage lockout or over-stress |
| Output Drive | ±6.0 mA at VCC = 4.5 V - sufficient to drive 50 pF loads with <30 ns propagation delay in typical bus applications |
| Propagation Delay | 24 ns typical (An → Yn, CL = 50 pF) - supports 20+ MHz bus clocking with timing margin |
| Enable/Disable Time | 35 ns max (ten/tdis, VCC = 4.5 V) - ensures clean bus release during multi-master arbitration or power sequencing |
| Operating Temperature | -40 °C to +125 °C - qualified for industrial and extended-temperature embedded control environments |
| Input Clamp Diodes | Integrated - allows safe interface to signals up to VCC + 0.5 V using external current-limiting resistors |
Pinout & Package
TSSOP20 plastic thin shrink small outline package (SOT360-1); 20-pin, 4.4 mm body width, 0.65 mm pitch; optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-state enable inputs; both must be LOW for output drivers to be active |
| 2–9 | A0–A7 | Inverting data inputs; each drives corresponding Yn output with polarity inversion |
| 10 | GND | Ground reference for all internal circuitry and I/O; requires low-impedance PCB plane |
| 11–18 | Y0–Y7 | Inverting 3-state outputs; HIGH when An = LOW and OEn = LOW; high-Z when either OE = HIGH |
| 20 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor (100 nF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V - eliminates need for external level shifters when interfacing with 5 V MCUs |
| Dual output enables | OE1 and OE2 in AND logic - enables flexible bus arbitration schemes and partial bus isolation |
| High noise immunity | Typical HNM = 1.2 V at VCC = 5 V - rejects common-mode noise in electrically noisy industrial environments |
| ESD protection | HBM > 2000 V, CDM > 1000 V - reduces risk of handling damage during assembly and field service |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage events |
Applications
| Microcontroller Bus Expansion | Memory Address Buffering |
|---|---|
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive multiple peripherals via shared parallel bus. IC Role / Device Role: Inverting 3-state buffer isolating MCU data/address lines from peripheral devices during contention. Use Value: Enables bidirectional bus sharing with precise timing control (tpd = 24 ns, ten/tdis = 35 ns max), reducing signal integrity issues in 16-bit parallel interfaces. | Use Scenario: Driving 12-bit address lines from a microprocessor to multiple SRAM chips on a shared memory bus. IC Role / Device Role: Inverting line driver providing fanout and voltage-level compatibility between MPU and memory devices. Use Value: Delivers ±6 mA drive into 50 pF loads while maintaining TTL input compatibility - eliminates need for discrete level translators in 5 V memory subsystems. |
| Industrial I/O Module | Digital Panel Controller Interface |
Use Scenario: Isolating PLC CPU outputs from relay driver arrays subject to inductive kickback and EMI. IC Role / Device Role: 3-state buffer with integrated input clamp diodes protecting against overvoltage transients. Use Value: Clamp diodes allow safe use of series current-limiting resistors - enabling robust 24 V-tolerant input interfacing without external TVS components. | Use Scenario: Interfacing an FPGA-based display controller to a 16-segment LED driver IC with strict timing requirements. IC Role / Device Role: Timing-critical inverting buffer synchronizing control signals between FPGA and LED driver. Use Value: Guaranteed 35 ns max enable/disable time ensures glitch-free state transitions during dynamic display updates at 1 kHz refresh rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT540PWR | TI part in TSSOP20; VIH/VIL thresholds identical; tpd = 25 ns max (vs. 24 ns typ for Nexperia) | Same functional behavior; slightly higher max propagation delay impacts tight-timing designs | Select when TI supply chain alignment or existing TI design reuse is prioritized |
| 74HCT540D | Nexperia SO20 (SOT163-1); same electrical specs but larger footprint (7.5 mm width vs. 4.4 mm) | Less suitable for space-constrained PCBs; better thermal dissipation (Ptot derates at 109 °C vs. 100 °C for TSSOP) | Select for manual assembly, prototyping, or thermal-heavy industrial applications where board area is not constrained |
Compared with SN74HCT540PWR, the 74HCT540PWJ offers tighter typical propagation delay and identical DC specs in a smaller TSSOP20 package; compared with 74HCT540D, it trades thermal margin for 40 % board area reduction - critical for compact industrial controllers.
Availability
74HCT540PWJ is available at Aetrix Electronics and suitable for microcontroller bus expansion, memory address buffering, and industrial I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT540PWJ 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT540PWJ belongs to Nexperia's 74HCT logic family, engineered for robust 5 V TTL-to-CMOS interfacing in industrial control and embedded systems where reliability, wide temperature operation, and ESD resilience are essential.
FAQ
What is the maximum clock frequency supported by the 74HCT540PWJ in a bus application?
The 74HCT540PWJ does not operate on a clock; it is asynchronous. Its usable data rate depends on propagation delay (24 ns typ) and enable timing (35 ns max). For reliable operation with setup/hold margins, it supports bus toggle rates up to ~15 MHz in well-terminated 50 pF loads - verified by dynamic characterization at CL = 50 pF per output.
Can the 74HCT540PWJ be used with a 3.3 V microcontroller?
No - the 74HCT540PWJ requires VCC = 4.5–5.5 V and has TTL-level inputs (VIH ≥ 2.0 V). A 3.3 V MCU cannot reliably drive its inputs high. Use 74LVC540 or 74ALVC540 for 3.3 V systems, or add level-shifting circuitry if interfacing is mandatory.
Is the 74HCT540PWJ pin-compatible with the 74HC540PW?
Yes - both share identical TSSOP20 pinout (SOT360-1), same pin functions, and compatible DC/AC specifications. However, 74HC540PW uses CMOS-level inputs (VIH = 3.15 V min at VCC = 4.5 V), so substituting it for 74HCT540PW may cause logic errors when driven by TTL or 5 V MCU outputs.
Does the 74HCT540PWJ require external pull-up or pull-down resistors on OE pins?
No - OE1 and OE2 have no internal pull resistors and must be actively driven. Leaving them floating risks undefined output states. Design practice mandates connecting OE pins to GND (to enable) or VCC (to disable) via MCU GPIO or hardwired logic - never left unconnected.
74HCT540PWJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74HCT540PWJ FAQ
1.How can I place an order for 74HCT540PWJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT540PWJ 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 74HCT540PWJ reliable?
The price and inventory of 74HCT540PWJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT540PWJ is usually 5 days.
3.What payment methods are accepted for 74HCT540PWJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT540PWJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT540PWJ?
74HCT540PWJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT540PWJ 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 74HCT540PWJ?
For technical support, including 74HCT540PWJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT540PWJ requirements.
6.How does Aetrix verify that 74HCT540PWJ is sourced from the original manufacturer or authorized distributors?
All 74HCT540PWJ 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 74HCT540PWJ meets industry standards.
7.What is the process for return or replacement of 74HCT540PWJ?
All 74HCT540PWJ units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT540PWJ, 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 74HCT540PWJ part is unused and in its original packaging.
Return procedure for 74HCT540PWJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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