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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Nexperia USA Inc. 74HCT540DB,112

Name: 74HCT540DB,112
Brand: Nexperia USA Inc.
SKU: 74HCT540DB,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HCT540DB,112

Manufacturer:: Nexperia USA Inc.

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SSOP (0.209", 5.30mm Width)

Datasheet:: 74HCT540DB,112.pdf

Description:: IC BUFFER INVERT 5.5V 20SSOP

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Product details

Overview

74HCT540DB,112 from Nexperia is an octal inverting 3-state buffer/line driver with dual output enables (OE1, OE2), TTL-compatible input thresholds, 20-pin SSOP package, and operation from 4.5 V to 5.5 V. It drives high-capacitance buses in microcontroller address/data latching, memory interfacing, and peripheral I/O expansion.

For engineers reviewing the 74HCT540DB,112 datasheet, 74HCT540DB,112 pinout, 74HCT540DB,112 application, or 74HCT540DB,112 equivalent, key selection criteria include TTL-level input compatibility, 3-state output control timing (t_en ≤ 53 ns max at −40 °C to +125 °C), inverting logic function, and SSOP20 thermal derating (10.0 mW/K above 100 °C).

Technical Context

The device implements eight identical inverting buffer circuits with independent input clamping diodes enabling overvoltage-tolerant interfacing via current-limiting resistors. Its dual active-low output enables allow selective bus partitioning without external gating logic.

Logic operation follows a strict functional table: outputs go high-impedance when either OE1 or OE2 is HIGH; otherwise, Y_n = NOT A_n. Propagation delay (A_n to Y_n) is 11–36 ns across temperature and voltage, with matched enable/disable timing (t_en/t_dis ≤ 53 ns max at V_CC = 4.5 V, −40 °C to +125 °C).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures direct compatibility with 5 V TTL and mixed-voltage systems without level shifters.
Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - Matches standard TTL logic families for seamless integration into legacy 5 V digital systems.
Output Drive	±6.0 mA at V_CC = 4.5 V - Sufficient to drive 50 pF loads with <30 ns propagation delay, supporting moderate-speed bus loading.
3-State Enable Time	t_en ≤ 53 ns (max, −40 °C to +125 °C) - Enables fast bus arbitration in real-time control applications with tight timing budgets.
Operating Temperature	−40 °C to +125 °C - Qualified for industrial and extended-temperature embedded environments without derating penalties below 100 °C.
Power Dissipation	P_tot = 500 mW (derates 10.0 mW/K above 100 °C) - Supports sustained operation in compact SSOP20 layouts with controlled PCB thermal design.
ESD Robustness	HBM > 2000 V, CDM > 1000 V - Reduces handling sensitivity and improves board-level reliability during manufacturing and field service.

Pinout & Package

74HCT540DB,112 uses the SOT339-1 (SSOP20) package: 20-pin shrink small outline, 5.3 mm body width, 0.65 mm lead pitch, and exposed pad not present. Pin 1 is marked by a beveled corner or dot.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-low 3-state enables - Either pin HIGH forces all eight outputs into high-impedance; both LOW enables inverted data pass-through.
2–9	A0–A7	Inverting data inputs - Each input drives its corresponding output with logical inversion; clamp diodes permit safe overvoltage interface.
10	GND	Ground reference - Must be low-inductance connected to system ground plane to maintain noise immunity and switching integrity.
11–18	Y7–Y0	Inverting 3-state outputs - Output order is reversed (Y7 on pin 11, Y0 on pin 18); each mirrors A_n with inversion and tri-state control.
20	V_CC	Positive supply - Requires local 100 nF ceramic decoupling within 5 mm to suppress switching noise and ensure stable operation.

Key Features

Feature	Design Value
TTL-compatible inputs	Validates direct connection to 5 V microcontrollers, FPGAs, and legacy logic without level translation circuitry.
Dual independent output enables	Allows segmented bus control - e.g., OE1 manages upper byte, OE2 manages lower byte - reducing contention risk in multi-master systems.
Input clamp diodes	Enables safe interfacing to signals up to V_CC + 0.5 V using series current-limiting resistors, simplifying mixed-voltage signal routing.
High noise immunity	CMOS input structure with >400 mV noise margin at V_CC = 5 V ensures reliable operation in electrically noisy industrial enclosures.
Latch-up immunity	Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage or hot-insertion events.

Applications

Microcontroller Bus Expansion

Memory Address Latching

Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive 8-bit parallel LCD, keypad scanner, or sensor array.

IC Role / Device Role: Inverting 3-state buffer isolating MCU pins from capacitive bus loads while enabling shared resource access.

Use Value: Prevents signal degradation on 15 cm traces with 40 pF load; t_pd ≤ 24 ns ensures timing closure at 20 MHz bus clock.

Use Scenario: Latching 8-bit address lines from an 8051-based system to static RAM or EPROM chips.

IC Role / Device Role: Inverting address driver with OE-controlled tristate to isolate address bus during data read/write cycles.

Use Value: Dual OE pins allow synchronized address hold during memory access windows; VOL ≤ 0.4 V guarantees clean low-level recognition.

Industrial I/O Module

Legacy Peripheral Interface

Use Scenario: Driving optocoupler inputs in a DIN-rail PLC I/O module with 24 V field-side isolation.

IC Role / Device Role: Level-translated buffer converting 5 V logic to current-limited 24 V interface via external resistors and clamping diodes.

Use Value: Built-in input clamps eliminate need for discrete protection diodes; VIH = 2.0 V ensures robust triggering despite supply ripple.

Use Scenario: Interfacing ISA-bus peripherals (e.g., parallel port cards) to modern embedded controllers via FPGA bridge.

IC Role / Device Role: Bidirectional bus transceiver replacement where inverting logic matches legacy protocol handshake timing.

Use Value: Matched t_en/t_dis ≤ 53 ns supports ISA's 8.33 MHz timing; SSOP20 footprint fits space-constrained adapter PCBs.

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
74HCT540PW,118	TSSOP20 package (4.4 mm width); P_tot derates at 10.0 mW/K above 100 °C - identical electrical specs but smaller footprint and higher thermal resistance.	Better suited for ultra-compact designs where board area is constrained; requires tighter layout control for thermal management.	Select when PCB real estate is critical and thermal vias can be added under the exposed pad-less TSSOP body.
SN74HCT540PWR	Texas Instruments part in TSSOP20; V_IH/V_IL thresholds match (2.0 V/0.8 V), but t_pd = 19 ns typ (vs. 13 ns typ for Nexperia) and ICC = 160 μA max at +125 °C (vs. 160 μA same).	Valid for drop-in use in non-critical timing paths; TI's qualification includes automotive AEC-Q100 Grade 3 (−40 °C to +85 °C only).	Choose if AEC-Q100 compliance is required for commercial-automotive hybrid systems, accepting minor timing margin reduction.

Compared with 74HCT540PW,118, the 74HCT540DB,112 offers wider body width (5.3 mm vs. 4.4 mm) for improved manual soldering yield and lower thermal resistance; versus SN74HCT540PWR, it provides identical industrial temperature range support and tighter propagation delay consistency across voltage and temperature extremes.

Availability

74HCT540DB,112 is available at Aetrix Electronics and suitable for industrial control panels, embedded instrumentation, and programmable logic interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT540DB,112 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 essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for industrial, automotive, and consumer markets.

The 74HCT540DB,112 belongs to Nexperia's 74HCT logic family - engineered for TTL-compatible interfacing in noise-sensitive, thermally demanding embedded systems where reliability and consistent timing behavior are critical.

FAQ

What is the maximum clock frequency supported by the 74HCT540DB,112?

The 74HCT540DB,112 is not a clocked device and has no internal clock; its usable data rate depends on propagation delay and load. With CL = 50 pF and V_CC = 4.5 V, t_pd ≤ 30 ns (max), supporting reliable operation up to approximately 16 MHz for toggling waveforms - assuming setup/hold margins and PCB trace effects are accounted for in system timing analysis.

Can OE1 and OE2 be tied together for single-enable operation?

Yes - OE1 and OE2 may be connected to a common control signal. The functional table confirms that a HIGH on either enable forces all outputs to high-impedance; tying them together preserves full 3-state functionality while reducing GPIO usage. No additional pull-up/down resistors are needed beyond standard enable logic driving requirements.

Does the 74HCT540DB,112 require external pull-up resistors on outputs?

No - outputs are actively driven HIGH or LOW when enabled, and enter true high-impedance (not weak pull-up) when disabled. External pull-ups are unnecessary unless a specific bus architecture mandates a defined idle state; in such cases, resistor values must be selected to avoid exceeding I_OH/I_OL limits during active drive.

Is the SSOP20 package (SOT339-1) RoHS and REACH compliant?

Yes - the 74HCT540DB,112 is manufactured in accordance with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Nexperia's official product change notices confirm lead-free matte tin terminations, halogen-free molding compound, and full substance declaration compliance as of Rev. 8 (August 2024).

74HCT540DB,112 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: 74HCT

Package/Case:: 20-SSOP (0.209", 5.30mm 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:: 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-SSOP

74HCT540DB,112 FAQ

1.How can I place an order for 74HCT540DB,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HCT540DB,112 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 74HCT540DB,112 reliable?

The price and inventory of 74HCT540DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT540DB,112 is usually 5 days.

3.What payment methods are accepted for 74HCT540DB,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT540DB,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74HCT540DB,112?

74HCT540DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HCT540DB,112 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 74HCT540DB,112?

For technical support, including 74HCT540DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT540DB,112 requirements.

6.How does Aetrix verify that 74HCT540DB,112 is sourced from the original manufacturer or authorized distributors?

All 74HCT540DB,112 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 74HCT540DB,112 meets industry standards.

7.What is the process for return or replacement of 74HCT540DB,112?

All 74HCT540DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT540DB,112, 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 74HCT540DB,112 part is unused and in its original packaging.

Return procedure for 74HCT540DB,112:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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