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

NXP Semiconductors 74HCT240D-Q100,118

Name: 74HCT240D-Q100,118
Brand: NXP Semiconductors
SKU: 74HCT240D-Q100,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HCT240D-Q100,118

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74HCT240D-Q100,118.pdf

Description:: IC BUFFER INVERT 5.5V 20SO

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Product details

Overview

74HCT240D-Q100,118 from Nexperia is an automotive-qualified octal inverting 3-state buffer/line driver in SO20 (SOT163-1) package, operating from 4.5 V to 5.5 V, delivering 6 mA output drive at V_CC = 4.5 V, with propagation delay ≤20 ns (typ), and qualified to AEC-Q100 Grade 1 (−40 °C to +125 °C). It serves as a bidirectional bus interface isolator in automotive body control modules.

For engineers reviewing the 74HCT240D-Q100,118 datasheet, 74HCT240D-Q100,118 pinout, 74HCT240D-Q100,118 application, or 74HCT240D-Q100,118 equivalent, key selection criteria include 3-state enable timing (t_en ≤30 ns, t_dis ≤25 ns), input compatibility with TTL logic levels, automotive temperature range compliance, and SO20 package suitability for reflow-soldered PCBs in engine bay proximity.

Technical Context

This device implements dual independent 4-bit inverting buffers, each with dedicated active-low 3-state enable (1OE, 2OE). Outputs enter high-impedance state when respective OE is HIGH, enabling bus sharing without contention. The HCT family ensures TTL-compatible input thresholds (V_IL ≤0.8 V, V_IH ≥2.0 V at V_CC = 4.5–5.5 V) while maintaining CMOS power efficiency.

Logic operation follows standard truth table: when nOE = LOW, nYn = NOT(nAn); when nOE = HIGH, nYn = Z. Propagation delays are symmetric (t_PHL ≈ t_PLH), and transition times (t_THL/t_TLH) remain ≤12 ns under 15 pF load, supporting reliable signal integrity in 25 MHz bus environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Matches automotive 5 V rail with ±10 % tolerance; avoids level-shifting in CAN/LIN subsystem interfaces.
Input Logic Threshold	V_IH ≥2.0 V, V_IL ≤0.8 V - Ensures direct interfacing with legacy TTL outputs without pull-ups or voltage translation.
Output Drive Strength	±6 mA at V_CC = 4.5 V - Sufficient to drive 10 LSTTL loads or 50 Ω transmission lines with controlled edge rates.
Propagation Delay	9 ns (typ) at V_CC = 5.0 V, C_L = 15 pF - Enables reliable operation in 25 MHz synchronous bus clock domains.
Enable/Disable Timing	t_en ≤30 ns, t_dis ≤25 ns - Guarantees clean bus arbitration during multiplexer switching in diagnostic communication gateways.
Operating Temperature	−40 °C to +125 °C - Validated for under-hood placement per AEC-Q100 Grade 1, including thermal cycling and HTOL stress.
ESD Robustness	HBM >2000 V, CDM >1000 V - Mitigates field-induced latch-up in assembly and service environments.

Pinout & Package

SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, gull-wing leads, JEDEC MS-013 compliant. RoHS-compliant, halogen-free, lead-free finish.

Pin	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low 3-state enable inputs - Assert LOW to activate respective 4-bit buffer bank; tied HIGH to isolate bus segments.
2, 4, 6, 8	1A0–1A3	First bank data inputs - Inverted and driven to 1Y0–1Y3 when 1OE = LOW; high-impedance otherwise.
3, 5, 7, 9	2Y0–2Y3	Second bank outputs - Inverted mirror of 2A0–2A3 when 2OE = LOW; tri-stated when 2OE = HIGH.
10	GND	Digital ground reference - Must be low-inductance connection to system ground plane to maintain noise immunity.
11, 13, 15, 17	2A0–2A3	Second bank data inputs - Independent of first bank; enables dual-bus isolation in gateway ECUs.
12, 14, 16, 18	1Y0–1Y3	First bank outputs - Provide inverted buffered signals to downstream logic or display drivers.
20	V_CC	Positive supply - Requires local 100 nF ceramic decoupling capacitor placed within 5 mm of pin.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for −40 °C to +125 °C operation with HTOL, TC, ESD, and latch-up testing per automotive reliability standards.
TTL-compatible input thresholds	V_IH ≥2.0 V and V_IL ≤0.8 V at 4.5–5.5 V supply - Eliminates need for external level shifters when interfacing with legacy microcontrollers.
Low dynamic power dissipation	C_PD = 30 pF per buffer - Limits switching current in high-frequency bus applications, reducing thermal load on PCB.
Fast 3-state control	t_en/t_dis ≤30 ns - Enables sub-33 ns bus turnaround time, critical for ISO 11898-2 CAN FD arbitration phases.
High noise immunity	CMOS input structure with >40 % V_CC noise margin - Maintains logic integrity in electrically noisy engine compartments.

Applications

Automotive Body Control Module

Instrument Cluster Interface

Use Scenario: Isolating microcontroller GPIOs from multiplexed LED driver and relay control buses.

IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled signal routing between MCU and peripheral ICs.

Use Value: Prevents bus contention during firmware updates; enables hot-swap capability for modular dashboard assemblies.

Use Scenario: Driving segmented LCD backplane signals from a low-voltage MCU in a temperature-compensated gauge cluster.

IC Role / Device Role / Timing Role: Level-translating and current-boosting buffer for 5 V LCD bias generation circuitry.

Use Value: Delivers stable 6 mA sink/source per segment across −40 °C to +125 °C, ensuring consistent contrast under thermal stress.

Powertrain Diagnostic Gateway

ADAS Camera Interface Buffer

Use Scenario: Arbitrating between multiple ECUs accessing shared diagnostic test access port (TAP) signals.

IC Role / Device Role / Timing Role: Bidirectional bus isolator with sub-30 ns enable/disable latency for JTAG/SWD protocol handshaking.

Use Value: Meets ISO 13400-2 DoIP timing constraints for secure flash programming without signal reflection or skew.

Use Scenario: Conditioning MIPI CSI-2 D-PHY clock and data lanes before routing to image signal processor (ISP).

IC Role / Device Role / Timing Role: Low-skew inverting repeater for differential pair termination and fanout expansion.

Use Value: Maintains <15 ns inter-pair skew across all 8 channels, preserving pixel clock integrity up to 1.5 Gbps.

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
74HCT240PW-Q100	TSSOP20 package (4.4 mm width), 100 °C max junction derating point vs. 109 °C for SO20	Better PCB space efficiency but lower thermal mass; requires tighter reflow profile control	Select for compact layouts where board area is constrained and thermal management is via copper pour
SN74HCT240QPWRQ1	Texas Instruments variant; identical logic function but different V_OH/V_OL specs (V_OH min = 4.3 V @ I_O = −6 mA)	Slightly higher output voltage margin improves noise margin in long-trace wiring harnesses	Prefer for chassis-level wiring applications where >0.5 V noise margin is required over 2 m cable runs

Compared with 74HCT240PW-Q100, the SO20 package offers superior thermal robustness and legacy manufacturing compatibility; compared with SN74HCT240QPWRQ1, the Nexperia part provides tighter propagation delay consistency (±1 ns variation) critical for synchronized multi-channel sampling.

Availability

74HCT240D-Q100,118 is available at Aetrix Electronics and suitable for automotive body control modules, instrument cluster interfaces, and powertrain diagnostic gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT240D-Q100,118 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 optimized for automotive, industrial, and mobile markets.

The 74HCT-Q100 series targets automotive electronics with AEC-Q100 qualification, emphasizing robustness, wide temperature operation, and interoperability with legacy TTL systems in safety-critical vehicle subsystems.

FAQ

Is 74HCT240D-Q100,118 pin-compatible with standard 74LS240?

Yes - it is pin-compatible with 74LS240 and other industry-standard octal inverting buffers in SO20 package. Pin assignments for inputs (1A0–1A3, 2A0–2A3), outputs (1Y0–1Y3, 2Y0–2Y3), enables (1OE, 2OE), V_CC, and GND match exactly. No PCB redesign is needed for drop-in replacement in existing LSTTL-based designs.

What is the maximum capacitive load this device can drive reliably?

The device is characterized up to 50 pF load capacitance per output, with guaranteed t_pd ≤30 ns and t_dis ≤38 ns at C_L = 50 pF and V_CC = 4.5 V. For loads exceeding 50 pF, slew rate degrades and propagation delay increases linearly; use external series termination or buffer staging above 75 pF.

Can both output banks be enabled simultaneously without conflict?

Yes - both banks operate independently. Enabling 1OE and 2OE simultaneously drives 1Y0–1Y3 and 2Y0–2Y3 concurrently with no internal contention. This configuration is used in dual-bus transceivers where separate upstream/downstream data paths share common control logic.

Does this part support partial power-down operation?

No - the device lacks I^OFF protection. If V_CC = 0 V while inputs are driven, DC current flows through input clamps (±20 mA limit). For hot-plug or partial-power systems, add external series resistors (≥1 kΩ) on all inputs to limit clamp current during V_CC ramp-up.

74HCT240D-Q100,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74HCT

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

Packaging:: Bulk

Product Status:: Active

Logic Type:: Buffer, Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

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:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

74HCT240D-Q100,118 FAQ

1.How can I place an order for 74HCT240D-Q100,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HCT240D-Q100,118 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 74HCT240D-Q100,118 reliable?

The price and inventory of 74HCT240D-Q100,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT240D-Q100,118 is usually 5 days.

3.What payment methods are accepted for 74HCT240D-Q100,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT240D-Q100,118 transactions.

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4.How is shipping managed for 74HCT240D-Q100,118?

74HCT240D-Q100,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HCT240D-Q100,118 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 74HCT240D-Q100,118?

For technical support, including 74HCT240D-Q100,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT240D-Q100,118 requirements.

6.How does Aetrix verify that 74HCT240D-Q100,118 is sourced from the original manufacturer or authorized distributors?

All 74HCT240D-Q100,118 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 74HCT240D-Q100,118 meets industry standards.

7.What is the process for return or replacement of 74HCT240D-Q100,118?

All 74HCT240D-Q100,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT240D-Q100,118, 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 74HCT240D-Q100,118 part is unused and in its original packaging.

Return procedure for 74HCT240D-Q100,118:

1.Submit a request within 90 days.

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

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