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

Nexperia USA Inc. 74HC540D,653

Name: 74HC540D,653
Brand: Nexperia USA Inc.
SKU: 74HC540D,653
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HC540D,653

Manufacturer:: Nexperia USA Inc.

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: 74HC540D,653.pdf

Description:: IC BUFFER INVERT 6V 20SO

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Product details

Overview

74HC540D,653 from Nexperia is an octal inverting 3-state buffer/line driver in SO20 (SOT163-1) package, operating from 2.0 V to 6.0 V supply, featuring dual active-low output enables (OE1, OE2), CMOS-level inputs, and ±35 mA output drive capability. It serves as a bidirectional bus interface or address/data line driver in microcontroller peripheral expansion, memory interfacing, and industrial control I/O buffering.

For engineers reviewing the 74HC540D,653 datasheet, 74HC540D,653 pinout, 74HC540D,653 application, or 74HC540D,653 equivalent, key selection considerations include its inverting logic behavior, dual enable architecture for independent group control, -40 °C to +125 °C temperature rating, 3-state timing (t_en = 15 ns typ @ V_CC = 6.0 V), and compatibility with HC-logic voltage thresholds.

Technical Context

This device implements eight identical inverting buffer circuits, each with high-impedance (Z) output control via two independent active-low enables. Its input clamp diodes allow safe interfacing to voltages exceeding V_CC when used with current-limiting resistors.

The logic function follows a strict truth table: outputs Y_n = NOT A_n only when both OE1 and OE2 are LOW; otherwise all outputs enter high-impedance state. Static parameters include VIH ≥ 4.2 V (V_CC = 6.0 V), VOL ≤ 0.26 V (IO = 7.8 mA), and ICC ≤ 160 μA over full temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Inverting octal buffer with 3-state outputs - enables bidirectional bus isolation and signal polarity inversion in one stage.
Supply Voltage Range	2.0 V to 6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU to 5 V peripheral).
Output Drive	±35 mA per output - sufficient to directly drive LEDs, relays, or TTL loads without external amplification.
Propagation Delay	9 ns typical (V_CC = 6.0 V, CL = 50 pF) - ensures timing-critical data path integrity in high-speed digital systems.
Enable Timing	t_en = 15 ns, t_dis = 18 ns (V_CC = 6.0 V) - allows precise, low-jitter bus arbitration and hot-swap control.
Operating Temperature	-40 °C to +125 °C - qualified for under-hood automotive, industrial PLC, and power supply monitoring applications.
ESD Rating	HBM > 2000 V, CDM > 1000 V - provides robust handling margin during PCB assembly and field service.

Pinout & Package

74HC540D,653 uses the SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, with standard JEDEC pin 1 index marking and gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-low output enable inputs - both must be LOW for functional output; independent control enables split-bus partitioning.
2–9	A0–A7	Inverting data inputs - accept CMOS-level signals; internal clamp diodes permit overvoltage-safe interfacing.
10	GND	Ground reference - dedicated low-inductance return path for all internal logic and output switching currents.
11–18	Y0–Y7	Inverting 3-state outputs - drive external loads or buses; high-impedance state eliminates contention during multiplexing.
20	V_CC	Positive supply - powers all internal logic and output stages; decoupling capacitor required within 10 mm.

Key Features

Feature	Design Value
Wide V_CC range (2.0–6.0 V)	Enables direct interoperability between 2.5 V, 3.3 V, and 5 V logic domains without level shifters.
Dual independent output enables	Permits selective activation of two 4-bit groups (Y0–Y3 / Y4–Y7), simplifying segmented bus management.
Input clamp diodes	Allows safe connection to signals up to V_CC + 0.5 V using series resistors - critical for legacy system retrofits.
High noise immunity	VIH/VIL margins exceed 30% of V_CC across full voltage range - suppresses false triggering in electrically noisy environments.
Latch-up immunity	Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage events.

Applications

Microcontroller I/O Expansion

Memory Address/Data Buffering

Use Scenario: Expanding GPIO count on an ARM Cortex-M4 MCU to drive 8-channel LED indicators and push-button inputs.

IC Role / Device Role / Timing Role: Inverting buffer isolates MCU pins from load transients; 3-state enables shared bus access with other peripherals.

Use Value: Eliminates need for discrete MOSFETs or additional logic gates while maintaining signal integrity at 20 MHz toggle rates.

Use Scenario: Isolating Z80 CPU address lines from EPROM and RAM chips on a retro-computing motherboard.

IC Role / Device Role / Timing Role: Acts as unidirectional address latch driver with controlled enable timing to meet memory setup/hold windows.

Use Value: Reduces address skew across 8-bit bus by <1 ns versus discrete resistor-transistor buffers.

Industrial PLC Input Conditioning

Test Equipment Signal Routing

Use Scenario: Conditioning 24 V DC sensor inputs into a 3.3 V FPGA-based controller via optocoupler outputs.

IC Role / Device Role / Timing Role: Provides level translation and current limiting; dual OE supports modular I/O module enable/disable.

Use Value: Clamp diodes tolerate 28 V transients without external protection; 125 °C rating supports enclosure mounting near power supplies.

Use Scenario: Multiplexing DUT signals between multiple measurement instruments in automated test equipment.

IC Role / Device Role / Timing Role: Functions as a low-latency, low-crosstalk signal switch with sub-20 ns enable/disable transitions.

Use Value: 3-state isolation prevents backfeeding between instruments; propagation delay variation <1 ns ensures phase coherence.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal inverting buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74HCT540D,653	TTL-compatible inputs (VIH = 2.0 V min); identical pinout and timing.	Better suited for mixed 5 V TTL/CMOS systems where input thresholds must match legacy logic families.	Select when interfacing with 74LS or 74ALS devices without level shifters.
SN74HC540PWR	TSSOP20 package (SOT360-1); same electrical specs but 4.4 mm body width and finer pitch.	Preferred for space-constrained PCBs; thermal resistance higher than SO20, limiting max continuous current.	Choose for high-density layouts where board area is constrained and thermal derating is managed.

Compared with 74HC540D,653, the 74HCT540D,653 offers lower input threshold compatibility at no timing or drive trade-off, while SN74HC540PWR trades package size for slightly reduced thermal performance - both retain identical logic functionality and pin mapping.

Availability

74HC540D,653 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, industrial PLC input conditioning, and memory address/data buffering requiring stable component supply across extended temperature ranges.

Supply support for 74HC540D,653 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 delivering high-performance, reliable logic, analog, and discrete components with focus on efficiency and sustainability.

The 74HC540 belongs to Nexperia's high-speed CMOS logic family, engineered for robust operation in industrial automation, automotive subsystems, and consumer electronics where noise immunity and wide supply tolerance are essential.

FAQ

What is the maximum clock frequency supported by 74HC540D,653?

The 74HC540D,653 is not a clocked device-it has no internal clock and operates asynchronously. Its usable data rate is determined by propagation delay (9 ns typ @ 6.0 V) and transition time (4 ns typ), supporting clean signal edges up to ~50 MHz in well-terminated 50 pF loads. System-level timing depends on layout, loading, and enable sequencing.

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

Yes-OE1 and OE2 may be connected to a common control signal. This reduces enable pin count and simplifies driving circuitry. The functional behavior remains identical to asserting both enables simultaneously, with no timing or electrical penalty. Internal logic requires both to be LOW for output activation.

Does 74HC540D,653 support hot-swap insertion?

It supports controlled hot-swap when powered sequencing and enable timing are managed: V_CC must be stable before applying inputs or enabling outputs; OE pins should remain HIGH until power settles. The input clamp diodes and 20 mA clamping current limit mitigate damage from floating inputs during insertion.

How does the 74HC540D,653 differ from the 74HC240?

The 74HC540D,653 contains eight inverting buffers with dual enables; the 74HC240 has eight inverting buffers with a single active-low enable. Pinouts differ: 74HC240 uses separate OE pins per 4-bit group (1, 19), while 74HC540 uses OE1/OE2 (1, 19) for combined control. Electrical specs are otherwise nearly identical.

74HC540D,653 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: 74HC

Package/Case:: 20-SOIC (0.295", 7.50mm 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:: 7.8mA, 7.8mA

Voltage - Supply:: 2V ~ 6V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

74HC540D,653 FAQ

1.How can I place an order for 74HC540D,653 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HC540D,653 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 74HC540D,653 reliable?

The price and inventory of 74HC540D,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC540D,653 is usually 5 days.

3.What payment methods are accepted for 74HC540D,653?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC540D,653 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74HC540D,653?

74HC540D,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HC540D,653 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 74HC540D,653?

For technical support, including 74HC540D,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC540D,653 requirements.

6.How does Aetrix verify that 74HC540D,653 is sourced from the original manufacturer or authorized distributors?

All 74HC540D,653 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 74HC540D,653 meets industry standards.

7.What is the process for return or replacement of 74HC540D,653?

All 74HC540D,653 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC540D,653, 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 74HC540D,653 part is unused and in its original packaging.

Return procedure for 74HC540D,653:

1.Submit a request within 90 days.

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

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