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

Nexperia USA Inc. 74HC7540D,112

Name: 74HC7540D,112
Brand: Nexperia USA Inc.
SKU: 74HC7540D,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HC7540D,112

Manufacturer:: Nexperia USA Inc.

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74HC7540D,112.pdf

Description:: IC BUFFER INVERT 6V 20SO

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Product details

Overview

74HC7540D,112 from Nexperia is an 8-bit inverting Schmitt-trigger buffer/line driver with dual 3-state output enables (OE1, OE2), CMOS-level inputs, and SO20 package. It operates from 2.0 V to 6.0 V, delivers ±35 mA output drive, features 0.5 V hysteresis at 6.0 V supply, and supports industrial temperature range (−40 °C to +125 °C) for noise-immune signal conditioning in bus interface circuits.

For engineers reviewing the 74HC7540D,112 datasheet, 74HC7540D,112 pinout, 74HC7540D,112 application, or 74HC7540D,112 equivalent, key selection criteria include Schmitt-trigger input hysteresis (4.2 V VT+ / 1.8 V VT− at VCC = 6.0 V), dual active-low output enables, propagation delay of 11 ns (VCC = 6.0 V, CL = 50 pF), 3.5 pF input capacitance, and compliance with JEDEC JESD7A and JESD8C standards.

Technical Context

This device implements a dual-enable 3-state octal inverter architecture with Schmitt-trigger inputs that convert slow-rising/falling signals into clean digital transitions. Its two independent output enable inputs (OE1 and OE2) allow hierarchical bus control-both must be LOW for valid outputs; either HIGH forces all eight Yn outputs into high-impedance state.

The input stage includes clamp diodes enabling safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Transfer characteristics are defined by voltage thresholds VT+ (4.2 V) and VT− (1.8 V) at 6.0 V supply, yielding 2.4 V hysteresis-critical for rejecting analog noise on shared PCB traces or long cables.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.0 V to 6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V logic driving 5 V bus)
Output Drive Current	±35 mA - sufficient to directly drive multiple TTL loads or terminate unterminated transmission lines
Propagation Delay	11 ns (VCC = 6.0 V, CL = 50 pF) - enables reliable operation in 45 MHz digital systems
Schmitt Input Hysteresis	2.4 V (VT+ = 4.2 V, VT− = 1.8 V at VCC = 6.0 V) - rejects up to 2.4 V peak-to-peak noise without false triggering
Input Capacitance	3.5 pF - minimizes capacitive loading on upstream drivers and preserves signal edge integrity
Operating Temperature	−40 °C to +125 °C - qualified for under-hood automotive modules and industrial motor controllers
ESD Protection	HBM > 2000 V, CDM > 1000 V - withstands handling and board-level ESD events without latch-up

Pinout & Package

74HC7540D,112 uses the SOT163-1 (SO20) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE1)	Output Enable 1	Active-LOW control: drives all Yn outputs to high-Z when HIGH; must be LOW with OE2 for functional output
2–9 (A0–A7)	Data Inputs	Inverting Schmitt-trigger inputs accepting slow or noisy signals; clamp diodes permit overvoltage tolerance
10 (GND)	Ground Reference	0 V return path for all internal circuitry and output current sinking
11–18 (Y0–Y7)	Inverting Outputs	3-state buffered inversions of A0–A7; each capable of sourcing/sinking ±35 mA
19 (OE2)	Output Enable 2	Second active-LOW enable: both OE1 and OE2 must be LOW for valid outputs; provides redundancy or partitioned control
20 (VCC)	Supply Voltage	Primary power rail (2.0–6.0 V); powers internal logic and output stages; bypass capacitor required

Key Features

Feature	Design Value
Dual independent output enables	OE1 and OE2 provide fault-tolerant or segmented bus control-either HIGH disables all outputs
Schmitt-trigger input hysteresis	2.4 V window at 6.0 V supply ensures robust immunity to ground bounce and crosstalk on shared PCB traces
CMOS-level input compatibility	Accepts full-rail input voltages (0 V to VCC) with sub-μA leakage-interoperable with HC/HCT/AC families
High-noise-immunity design	Latch-up immunity >100 mA per JESD78 Class II Level B prevents destructive failure during transient overvoltage events
Wide temperature qualification	Specified from −40 °C to +125 °C-validates performance in engine control units and industrial PLC backplanes

Applications

Industrial Bus Interface

Automotive Sensor Signal Conditioning

Use Scenario: Isolating and strengthening signals between microcontroller GPIO and noisy 24 V CAN/LIN transceiver buses.

IC Role / Device Role / Timing Role: Inverting Schmitt buffer with 3-state control acts as bidirectional level-shifting repeater and noise filter on shared data lines.

Use Value: 2.4 V hysteresis suppresses EMI-induced glitches on long harness runs; ±35 mA drive sustains signal integrity across 100 cm PCB traces.

Use Scenario: Cleaning slow-rising analog sensor outputs (e.g., thermistor divider, potentiometer wiper) before ADC sampling.

IC Role / Device Role / Timing Role: Converts sluggish analog edges into sharp digital transitions for precise timing-critical edge detection in engine timing modules.

Use Value: VT+ = 4.2 V / VT− = 1.8 V thresholds ensure consistent switching despite supply ripple; 11 ns delay enables sub-100 ns timing resolution.

Programmable Logic I/O Expansion

Legacy System Bus Buffering

Use Scenario: Extending FPGA or CPLD I/O count to drive high-capacitance address/data buses in retro-computing or test equipment.

IC Role / Device Role / Timing Role: Octal inverting buffer with dual OE pins provides configurable direction control and bus contention prevention.

Use Value: Dual OE inputs allow hierarchical enable sequencing-prevents bus conflicts during hot-swap or partial reconfiguration events.

Use Scenario: Interfacing modern low-power MCUs to legacy 5 V parallel peripherals (e.g., dot-matrix displays, EPROM programmers).

IC Role / Device Role / Timing Role: Level-translating line driver with Schmitt inputs tolerates marginal rise times from aging TTL devices.

Use Value: Clamp diodes + current-limiting resistors enable safe 5.5 V input tolerance; 35 mA sink capability drives 10 LSTTL loads directly.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74HCT7540D,112	TTL-compatible inputs (VIH = 2.0 V min), identical SO20 package and pinout	Better interoperability with legacy 5 V TTL systems; slightly higher ICC at 5.5 V	Select when interfacing with standard TTL outputs or where input threshold consistency across mixed logic families is critical
SN74LVCH16244ADGGR	16-bit non-inverting, dual 8-bit bus hold, 3.3 V only, TSSOP48 package	Higher channel count, integrated bus-hold resistors, no Schmitt inputs	Choose for 3.3 V-only systems requiring higher density and passive input stabilization-but not for noise-prone analog-edge conditioning

Compared with 74HCT7540D,112, the original 74HC7540D,112 offers superior noise margin in mixed-signal environments due to its wider Schmitt hysteresis; versus SN74LVCH16244ADGGR, it provides deterministic edge regeneration for slow signals but lacks bus-hold functionality and operates across a broader voltage range.

Availability

74HC7540D,112 is available at Aetrix Electronics and suitable for industrial bus interface, automotive sensor signal conditioning, programmable logic I/O expansion, and legacy system bus buffering requiring stable component supply across extended temperature ranges.

Supply support for 74HC7540D,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 delivering high-performance, reliable discrete, logic, and MOSFET solutions optimized for efficiency and miniaturization in high-volume applications.

The 74HC7540D,112 belongs to Nexperia's HC logic family-designed specifically for noise-immune digital interfacing in industrial automation, automotive subsystems, and legacy system upgrades where signal integrity and wide supply flexibility are essential.

FAQ

What is the minimum supply voltage for guaranteed operation of 74HC7540D,112?

The 74HC7540D,112 is fully specified down to 2.0 V supply voltage per JEDEC JESD7A. At this level, VIH remains ≥1.9 V and VOL ≤0.26 V with 6.0 mA load, ensuring reliable logic-level translation in battery-powered or low-voltage embedded systems.

Can OE1 and OE2 be tied together for simplified control?

Yes-OE1 and OE2 may be connected to a single control signal. The functional table confirms that either OE being HIGH forces all outputs to high-impedance; tying them reduces external routing while preserving full 3-state behavior and fault tolerance.

Does 74HC7540D,112 support hot insertion into live backplanes?

No-while the device includes input clamp diodes and high ESD ratings, it lacks explicit hot-swap protection circuitry such as slew-rate limiting or power-on reset. Live insertion requires external current limiting and sequencing controls per system-level safety requirements.

How does the Schmitt trigger improve performance in motor control feedback paths?

In motor control, encoder or hall-effect sensor outputs often exhibit slow edges and EMI-induced ringing. The 74HC7540D,112's 2.4 V hysteresis eliminates multiple transitions caused by noise, ensuring one clean edge per mechanical event-critical for accurate RPM calculation and commutation timing.

74HC7540D,112 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: 74HC

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

74HC7540D,112 FAQ

1.How can I place an order for 74HC7540D,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HC7540D,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 74HC7540D,112 reliable?

The price and inventory of 74HC7540D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC7540D,112 is usually 5 days.

3.What payment methods are accepted for 74HC7540D,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC7540D,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74HC7540D,112?

74HC7540D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HC7540D,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 74HC7540D,112?

For technical support, including 74HC7540D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC7540D,112 requirements.

6.How does Aetrix verify that 74HC7540D,112 is sourced from the original manufacturer or authorized distributors?

All 74HC7540D,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 74HC7540D,112 meets industry standards.

7.What is the process for return or replacement of 74HC7540D,112?

All 74HC7540D,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC7540D,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 74HC7540D,112 part is unused and in its original packaging.

Return procedure for 74HC7540D,112:

1.Submit a request within 90 days.

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

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