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

onsemi MC74LCX16240DT

Name: MC74LCX16240DT
Brand: onsemi
SKU: MC74LCX16240DT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74LCX16240DT

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 48-TFSOP (0.240", 6.10mm Width)

Datasheet:: MC74LCX16240DT.pdf

Description:: IC BUFFER INVERT 3.6V 48TSSOP

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Product details

Overview

MC74LCX16240DT from ON Semiconductor is a low-voltage CMOS 16-bit inverting buffer with 5 V-tolerant inputs/outputs, operating from 2.3 V to 3.6 V supply. It features nibble-level 3-state control (four independent OE inputs), ±24 mA output drive, and TTL/LVTTL/LVCMOS compatibility. Used for memory address driving and bus transceiver applications in mixed-voltage systems.

For engineers reviewing the MC74LCX16240DT datasheet, pinout, applications, or equivalent options, key selection factors include 5.5 V input tolerance, 2.3–3.6 V V_CC operation, 1.5 ns typical propagation delay at 3.3 V, high-impedance shutdown during power-off (I_OFF), and TSSOP-48 packaging for space-constrained PCB layouts.

Technical Context

The MC74LCX16240DT implements sixteen independent inverting buffers partitioned into four 4-bit nibbles, each controlled by its own Output Enable (OE1–OE4) input. Each nibble operates identically but electrically isolated, enabling flexible bus segmentation or partial enablement without affecting other sections.

Its 5.5 V absolute maximum input voltage rating and I_OFF specification (10 µA at V_CC = 0 V) support live insertion and mixed-voltage interfacing-e.g., connecting 3.3 V logic to legacy 5 V TTL buses while maintaining safe isolation during hot-swap events.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3 V to 3.6 V - Enables direct interface with 2.5 V and 3.3 V system rails without level shifters.
Input Voltage Max	5.5 V - Allows safe connection to 5 V TTL outputs without external clamping or translation.
Output Drive	±24 mA (sink/source at V_CC ≥ 3.0 V) - Sufficient to drive multiple LVTTL loads or terminate short stubs on parallel buses.
t_PLH/t_PHL	1.5 ns min / 5.4 ns max (V_CC = 3.3 V, C_L = 50 pF) - Supports >100 MHz bus toggle rates in high-speed address/data paths.
I_CC Quiescent	20 µA - Near-zero static current reduces standby power in battery-backed or low-power embedded systems.
I_OFF	10 µA at V_CC = 0 V - Ensures true high-impedance isolation during power-down or hot-plug, preventing backfeeding.

Pinout & Package

TSSOP-48 package (Case 1201, DT suffix), 0.5 mm pitch, 12.5 mm × 6.1 mm footprint, lead-free (Pb-free) construction per ON Semiconductor specification.

Pin/Terminal	Circuit Role	Design Meaning
OE1–OE4	Output Enable Inputs (active-low)	Each controls 4-bit nibble (D0–D3/O0–O3, etc.); LOW enables output, HIGH places outputs in high-Z state.
D0–D15	Data Inputs	Inverting inputs to corresponding buffers; accept 0–5.5 V signals regardless of V_CC.
O0–O15	3-State Outputs	Inverted, 5 V-tolerant outputs; drive strength and voltage levels scale with V_CC (2.3–3.6 V).
V_CC (Pins 7, 18, 30)	Power Supply	Three dedicated V_CC pins reduce IR drop and improve noise immunity across wide bus.
GND (Pins 4, 10, 15, 21, 27, 33, 44)	Ground Return	Seven GND pins provide low-inductance return paths for all 16 outputs and internal logic.

Key Features

Feature	Design Value
5 V-tolerant I/O	Supports direct interconnection with 5 V TTL logic without external level translators or protection diodes.
Nibble-level 3-state control	Enables selective bus arbitration-e.g., isolate memory address lines while keeping data lines active.
I_OFF protection	Guarantees <10 µA leakage when V_CC = 0 V, critical for hot-swap compliance and backpower prevention.
Low dynamic power	CPD = 20 pF enables predictable power estimation: P_dyn ≈ CPD × V_CC² × f, supporting thermal design in dense layouts.

Applications

Memory Address Driving	Backplane Bus Transceiver
Use Scenario: Driving 16-bit address bus for SRAM or Flash memory in a 3.3 V microcontroller system interfacing with 5 V peripherals. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing level-shifted, slew-controlled address signals with precise timing margins. Use Value: Eliminates need for discrete level shifters; 1.5 ns propagation delay ensures setup/hold compliance at >80 MHz bus speeds.	Use Scenario: Isolating and buffering bidirectional data lines between two 3.3 V FPGA domains sharing a common backplane. IC Role / Device Role / Timing Role: Nibble-controllable transceiver enabling partial bus partitioning and domain-specific enable sequencing. Use Value: Four independent OE inputs allow staggered enable/disable to suppress simultaneous switching noise (SSN) across 16 lines.
Hot-Swappable Module Interface	Mixed-Voltage System Interposer
Use Scenario: Buffering control signals between a mainboard (3.3 V) and hot-pluggable daughter card (5 V powered independently). IC Role / Device Role / Timing Role: Level-tolerant interface IC ensuring signal integrity and isolation during insertion/removal events. Use Value: I_OFF spec and 5.5 V VI rating prevent latch-up or damage when V_CC is unpowered during card insertion.	Use Scenario: Interfacing a 2.5 V ASIC core to a 5 V legacy peripheral bus in industrial control hardware. IC Role / Device Role / Timing Role: Voltage-agnostic buffer translating logic states while preserving timing integrity and drive capability. Use Value: ±24 mA drive at 2.5 V supports full fanout to 10 LVTTL loads; 7 pF C_IN minimizes loading on upstream drivers.

Memory Address Driving

Backplane Bus Transceiver

Use Scenario: Driving 16-bit address bus for SRAM or Flash memory in a 3.3 V microcontroller system interfacing with 5 V peripherals.

IC Role / Device Role / Timing Role: Inverting 3-state buffer providing level-shifted, slew-controlled address signals with precise timing margins.

Use Value: Eliminates need for discrete level shifters; 1.5 ns propagation delay ensures setup/hold compliance at >80 MHz bus speeds.

Use Scenario: Isolating and buffering bidirectional data lines between two 3.3 V FPGA domains sharing a common backplane.

IC Role / Device Role / Timing Role: Nibble-controllable transceiver enabling partial bus partitioning and domain-specific enable sequencing.

Use Value: Four independent OE inputs allow staggered enable/disable to suppress simultaneous switching noise (SSN) across 16 lines.

Hot-Swappable Module Interface

Mixed-Voltage System Interposer

Use Scenario: Buffering control signals between a mainboard (3.3 V) and hot-pluggable daughter card (5 V powered independently).

IC Role / Device Role / Timing Role: Level-tolerant interface IC ensuring signal integrity and isolation during insertion/removal events.

Use Value: I_OFF spec and 5.5 V VI rating prevent latch-up or damage when V_CC is unpowered during card insertion.

Use Scenario: Interfacing a 2.5 V ASIC core to a 5 V legacy peripheral bus in industrial control hardware.

IC Role / Device Role / Timing Role: Voltage-agnostic buffer translating logic states while preserving timing integrity and drive capability.

Use Value: ±24 mA drive at 2.5 V supports full fanout to 10 LVTTL loads; 7 pF C_IN minimizes loading on upstream drivers.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit inverting buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC16240ADGGR	Same 16-bit inverting 3-state architecture; 1.65–3.6 V V_CC, 5 V-tolerant I/O, but only two OE groups (not four nibbles).	Lacks independent nibble control; requires external logic for fine-grained bus segmentation.	Select when full 16-bit enable suffices and cost optimization is prioritized over nibble granularity.
74ALVC16240PW	16-bit inverting buffer, 1.65–3.6 V, 5 V-tolerant, but no I_OFF spec and higher I_CC (100 µA typical).	Not suitable for hot-swap or zero-power isolation scenarios due to undefined behavior at V_CC = 0 V.	Select only for fixed-installation systems where live insertion is not required and higher quiescent current is acceptable.

Compared with SN74LVC16240ADGGR and 74ALVC16240PW, the MC74LCX16240DT uniquely delivers four independent OE inputs for granular bus control and guaranteed I_OFF performance-making it optimal for modular, hot-pluggable, or mixed-rail embedded designs requiring deterministic isolation.

Availability

MC74LCX16240DT is available at Aetrix Electronics and suitable for memory address driving, backplane bus transceivers, hot-swappable module interfaces, and mixed-voltage system interposers requiring stable component supply and long-term industrial availability.

Supply support for MC74LCX16240DT 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

ON Semiconductor (now onsemi) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.

The MC74LCX16240DT belongs to the LCX family of low-voltage CMOS logic devices designed specifically for mixed-supply systems requiring robust 5 V tolerance, low power, and high noise immunity in space-constrained industrial and communications equipment.

FAQ

What is the maximum input voltage rating for the MC74LCX16240DT?

The MC74LCX16240DT supports a DC input voltage range of −0.5 V to +7.0 V, with a specified absolute maximum of +5.5 V for reliable 5 V TTL interface operation. This allows safe connection to 5 V logic sources without external protection circuitry, even when V_CC is at 2.3 V or 3.6 V.

Does the MC74LCX16240DT support hot-swap functionality?

Yes, the MC74LCX16240DT supports live insertion and withdrawal per its datasheet. Its I_OFF specification guarantees ≤10 µA leakage when V_CC = 0 V, and 5.5 V input tolerance prevents damage during partial power-up sequences-key requirements for hot-swap compliant backplane and modular system designs using the MC74LCX16240DT.

How many independent output enable groups does the MC74LCX16240DT have?

The MC74LCX16240DT has four independent output enable inputs (OE1–OE4), each controlling a 4-bit nibble (D0–D3/O0–O3, D4–D7/O4–O7, D8–D11/O8–O11, D12–D15/O12–O15). This nibble-level control enables selective bus arbitration and reduced simultaneous switching noise versus full 16-bit enable architectures.

What is the typical propagation delay of the MC74LCX16240DT at 3.3 V supply?

At V_CC = 3.3 V ± 0.3 V with C_L = 50 pF, the MC74LCX16240DT exhibits a minimum t_PLH/t_PHL of 1.5 ns and a maximum of 5.4 ns. This low-latency performance supports high-speed address/data bus operation up to 100+ MHz in properly terminated systems using the MC74LCX16240DT.

Is the MC74LCX16240DT pin-compatible with standard 16-bit buffer footprints?

The MC74LCX16240DT uses a TSSOP-48 package (Case 1201, DT suffix) with 0.5 mm pitch and defined pinout per Figure 1 of its datasheet. It is not pin-compatible with SOIC-48 or SSOP-48 variants; layout must follow the exact TSSOP-48 mechanical dimensions and pin mapping specified for the MC74LCX16240DT to ensure signal integrity and thermal performance.

MC74LCX16240DT Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCX

Package/Case:: 48-TFSOP (0.240", 6.10mm Width)

Packaging:: Bulk

Product Status:: Active

Logic Type:: Buffer, Inverting

Number of Elements:: 4

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 2V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

MC74LCX16240DT FAQ

1.How can I place an order for MC74LCX16240DT through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74LCX16240DT 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 MC74LCX16240DT reliable?

The price and inventory of MC74LCX16240DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX16240DT is usually 5 days.

3.What payment methods are accepted for MC74LCX16240DT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX16240DT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74LCX16240DT?

MC74LCX16240DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74LCX16240DT 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 MC74LCX16240DT?

For technical support, including MC74LCX16240DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX16240DT requirements.

6.How does Aetrix verify that MC74LCX16240DT is sourced from the original manufacturer or authorized distributors?

All MC74LCX16240DT 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 MC74LCX16240DT meets industry standards.

7.What is the process for return or replacement of MC74LCX16240DT?

All MC74LCX16240DT units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX16240DT, 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 MC74LCX16240DT part is unused and in its original packaging.

Return procedure for MC74LCX16240DT:

1.Submit a request within 90 days.

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

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