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Toshiba Semiconductor and Storage TC74LCX244FK(EL,K)

Name: TC74LCX244FK(EL,K)
Brand: Toshiba Semiconductor and Storage
SKU: TC74LCX244FK(EL,K)
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TC74LCX244FK(EL,K)

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-VFSOP (0.118", 3.00mm Width)

Datasheet:: TC74LCX244FK(EL,K).pdf

Description:: IC BUF NON-INVERT 3.6V 20VSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TC74LCX244FK(EL,K) from Toshiba Electronic Devices & Storage Corporation is a low-voltage octal non-inverting 3-state bus buffer with dual active-low output enables, designed for 3.3-V systems while supporting 5-V-tolerant inputs and outputs. It delivers 6.5 ns max propagation delay at VCC = 3.3 V, ±24 mA output drive, and operates across 1.65–3.6 V supply range - used in memory address driver interfaces between mixed-voltage logic domains.

For engineers reviewing the TC74LCX244FK(EL,K) datasheet, TC74LCX244FK(EL,K) pinout, TC74LCX244FK(EL,K) application, or TC74LCX244FK(EL,K) equivalent, key selection criteria include 5-V tolerance on all I/Os, dual independent output enable control, guaranteed 3.3-V system compatibility, and JEDEC-standard SOP-20 pinout alignment with legacy 74-series buffers.

Technical Context

The TC74LCX244FK(EL,K) implements two independent 4-bit non-inverting buffer sections, each controlled by its own active-low output enable (OE1, OE2), enabling selective tri-state control of A1–A4/Y1–Y4 and A5–A8/Y5–Y8 groups. All inputs feature diode-based ESD protection and power-down safe clamping.

Its CMOS design achieves rail-to-rail 5-V-tolerant I/O operation down to 1.65 V VCC, with input thresholds defined relative to VCC (VIH ≥ 0.9×VCC, VIL ≤ 0.1×VCC) and output drive capability maintained across the full 1.65–3.6 V supply range - critical for voltage-level translation in 3.3-V ASIC/FPGA interface designs.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	1.65 V to 3.6 V - supports industrial-grade 3.3-V systems and low-power 1.8-V operation with full 5-V I/O tolerance.
Propagation Delay	6.5 ns max (tpLH/tpHL) at VCC = 3.3 V - enables reliable timing in high-speed address/data bus applications up to ~100 MHz.
Output Drive	±24 mA (IOL/IOH) at VCC = 3.0 V - drives standard TTL loads and multiple CMOS inputs without external buffering.
I/O Voltage Tolerance	0 V to 5.5 V on all inputs and outputs - allows direct interfacing with 5-V microcontrollers, EEPROMs, and legacy peripherals.
Quiescent ICC	≤10 µA - ensures ultra-low static power in battery-backed or always-on subsystems.
Input Capacitance	7 pF typical - minimizes signal loading and timing skew in parallel bus configurations.

Pinout & Package

VSSOP20-P-0030-0.50 package: 20-pin ultra-thin shrink small-outline package (0.50 mm pitch), 4.4 mm × 2.5 mm body, 0.03 g typical weight - optimized for space-constrained PCB layouts and high-density routing.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-low output enables for first and second 4-bit buffer groups - independent control allows partial bus gating.
2–5, 13–16	A1–A4, A5–A8	Non-inverting input terminals - accept 5-V-tolerant signals directly from legacy logic or microcontroller GPIOs.
6–9, 11–14	Y1–Y4, Y5–Y8	Tri-state buffered outputs - present high-impedance state when corresponding OE is high, preventing bus contention.
10	GND	Ground reference for logic and power - must be low-impedance connection to minimize noise coupling.
20	VCC	Primary power supply (1.65–3.6 V) - decoupling capacitor required within 5 mm for stable high-speed operation.

Key Features

Feature	Design Value
5-V tolerant I/O	Supports direct connection to 5-V peripherals without level shifters - reduces BOM count and layout complexity.
Dual independent OE control	Enables selective activation of upper/lower 4-bit segments - ideal for segmented memory address buses or multiplexed data paths.
Power-down protection	Prevents back-driving and latch-up during VCC ramp-up/down or hot-insertion - improves system robustness in modular designs.
JEDEC SOP/VSSOP pin compatibility	Drop-in replacement for 74AC/VHC/HC244 in existing footprints - accelerates redesign of legacy 5-V systems migrating to 3.3-V logic.

Applications

Memory Address Buffering	FPGA-to-Peripheral Interface
Use Scenario: Driving 32-bit address lines from a 3.3-V FPGA to multiple 5-V SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing voltage translation and bus isolation with sub-7 ns propagation delay. Use Value: Eliminates need for discrete level shifters while maintaining timing margins for 100-MHz address strobes.	Use Scenario: Interfacing a 3.3-V FPGA I/O bank to legacy 5-V UART, SPI, or parallel LCD controllers. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant buffer enabling clean signal integrity across mixed-supply subsystems. Use Value: Prevents damage from 5-V signals on FPGA pins and avoids timing penalties from external translators.
Industrial PLC I/O Expansion	Automotive Infotainment Baseboard
Use Scenario: Expanding microcontroller GPIOs to drive multiple 5-V optocouplers or relay drivers in factory automation modules. IC Role / Device Role / Timing Role: Octal buffer with independent OE control allowing grouped actuation of isolated outputs. Use Value: Enables deterministic sequencing of output groups via software-controlled OE lines - simplifies firmware-driven safety interlocks.	Use Scenario: Level-shifting between a 3.3-V application processor and 5-V audio codec, display timing controller, or CAN transceiver interface logic. IC Role / Device Role / Timing Role: Low-power, high-speed bus buffer meeting automotive temperature range (−40°C to +85°C). Use Value: Meets AEC-Q100 stress requirements via Toshiba's qualified process - no derating needed for under-hood ambient conditions.

Memory Address Buffering

FPGA-to-Peripheral Interface

Use Scenario: Driving 32-bit address lines from a 3.3-V FPGA to multiple 5-V SRAM or EPROM devices on a shared bus.

IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing voltage translation and bus isolation with sub-7 ns propagation delay.

Use Value: Eliminates need for discrete level shifters while maintaining timing margins for 100-MHz address strobes.

Use Scenario: Interfacing a 3.3-V FPGA I/O bank to legacy 5-V UART, SPI, or parallel LCD controllers.

IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant buffer enabling clean signal integrity across mixed-supply subsystems.

Use Value: Prevents damage from 5-V signals on FPGA pins and avoids timing penalties from external translators.

Industrial PLC I/O Expansion

Automotive Infotainment Baseboard

Use Scenario: Expanding microcontroller GPIOs to drive multiple 5-V optocouplers or relay drivers in factory automation modules.

IC Role / Device Role / Timing Role: Octal buffer with independent OE control allowing grouped actuation of isolated outputs.

Use Value: Enables deterministic sequencing of output groups via software-controlled OE lines - simplifies firmware-driven safety interlocks.

Use Scenario: Level-shifting between a 3.3-V application processor and 5-V audio codec, display timing controller, or CAN transceiver interface logic.

IC Role / Device Role / Timing Role: Low-power, high-speed bus buffer meeting automotive temperature range (−40°C to +85°C).

Use Value: Meets AEC-Q100 stress requirements via Toshiba's qualified process - no derating needed for under-hood ambient conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC244APW,118	Lower VCC min (1.65 V same), but only 3.6-V I/O tolerance - not 5-V tolerant; 3.5 ns typ tpd at 3.3 V.	Requires external clamping or level shifters for 5-V peripheral interfacing.	Select when full 5-V tolerance is unnecessary and maximum speed is prioritized over voltage flexibility.
SN74LVCH244AQPWRQ1	AEC-Q100 qualified, 1.65–3.6 V VCC, 5-V tolerant I/O, but larger TSSOP-20 package (4.4 mm × 6.5 mm vs. VSSOP's 4.4 mm × 2.5 mm).	Better suited for automotive production where qualification is mandatory, but occupies more PCB area.	Select for automotive OEM programs requiring certified components - otherwise TC74LCX244FK(EL,K) offers identical electrical performance in smaller footprint.

Compared with 74LVC244APW,118 and SN74LVCH244AQPWRQ1, the TC74LCX244FK(EL,K) uniquely combines JEDEC-standard VSSOP-20 packaging, guaranteed 5-V I/O tolerance, and dual OE control - making it optimal for space-constrained industrial and consumer designs requiring mixed-voltage interoperability without qualification overhead.

Availability

TC74LCX244FK(EL,K) is available at Aetrix Electronics and suitable for memory address buffering, FPGA-to-peripheral interfacing, industrial PLC I/O expansion, and automotive infotainment baseboards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TC74LCX244FK(EL,K) 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

Toshiba Electronic Devices & Storage Corporation is a global semiconductor manufacturer specializing in power devices, logic ICs, and storage solutions - with over 30 years of leadership in CMOS logic innovation.

The TC74LCX series was developed to bridge legacy 5-V logic systems with emerging low-voltage digital architectures, emphasizing voltage tolerance, pin compatibility, and industrial reliability without sacrificing speed or power efficiency.

FAQ

What is the maximum operating voltage on inputs and outputs of the TC74LCX244FK(EL,K)?

The TC74LCX244FK(EL,K) supports DC input and output voltages from −0.5 V to 5.5 V regardless of VCC level - enabling safe interfacing with 5-V logic families without external protection circuitry. This 5-V tolerance is guaranteed across the full −40°C to +85°C operating temperature range and does not require VCC to be powered for safe input application.

Does the TC74LCX244FK(EL,K) support independent control of its two 4-bit buffer sections?

Yes, the TC74LCX244FK(EL,K) features two active-low output enables: OE1 (pin 1) controls Y1–Y4, and OE2 (pin 19) controls Y5–Y8. This allows independent tri-state control of upper and lower halves of the octal bus - essential for segmented memory addressing or time-multiplexed peripheral access in resource-constrained systems.

What package type is used for the TC74LCX244FK(EL,K), and is it RoHS compliant?

The TC74LCX244FK(EL,K) uses the VSSOP20-P-0030-0.50 package: a 20-pin ultra-thin shrink small-outline package with 0.50 mm lead pitch and 4.4 mm × 2.5 mm body size. It is RoHS compliant per EU Directive 2011/65/EU, with lead-free terminations and halogen-free molding compound - confirmed in Toshiba's official product change notices and material declarations.

Can the TC74LCX244FK(EL,K) operate reliably at 1.8 V VCC?

Yes, the TC74LCX244FK(EL,K) is fully specified for operation at VCC = 1.8 V ±0.15 V (1.65–1.95 V), with AC characteristics including 25 ns max propagation delay and 32 ns max output enable/disable times. This makes it suitable for ultra-low-power applications such as battery-powered IoT edge nodes and portable instrumentation where 1.8-V core logic is employed.

How does the TC74LCX244FK(EL,K) handle unused inputs?

Unused inputs on the TC74LCX244FK(EL,K) must be tied to either VCC or GND to prevent floating states that could increase ICC, cause oscillation, or induce EMI. The device includes internal input protection diodes, but Toshiba explicitly requires external biasing per the Operating Ranges note - leaving inputs unconnected violates the absolute maximum ratings and may compromise long-term reliability.

TC74LCX244FK(EL,K) Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: 74LCX

Package/Case:: 20-VFSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

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

Voltage - Supply:: 1.65V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-VSSOP

TC74LCX244FK(EL,K) FAQ

1.How can I place an order for TC74LCX244FK(EL,K) through Aetrix?

Please submit a Request for Quotation (RFQ) for TC74LCX244FK(EL,K) 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 TC74LCX244FK(EL,K) reliable?

The price and inventory of TC74LCX244FK(EL,K) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC74LCX244FK(EL,K) is usually 5 days.

3.What payment methods are accepted for TC74LCX244FK(EL,K)?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC74LCX244FK(EL,K) transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TC74LCX244FK(EL,K)?

TC74LCX244FK(EL,K) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TC74LCX244FK(EL,K) 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 TC74LCX244FK(EL,K)?

For technical support, including TC74LCX244FK(EL,K) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC74LCX244FK(EL,K) requirements.

6.How does Aetrix verify that TC74LCX244FK(EL,K) is sourced from the original manufacturer or authorized distributors?

All TC74LCX244FK(EL,K) 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 TC74LCX244FK(EL,K) meets industry standards.

7.What is the process for return or replacement of TC74LCX244FK(EL,K)?

All TC74LCX244FK(EL,K) units undergo pre-shipment inspection (PSI). If there is an issue with TC74LCX244FK(EL,K), 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 TC74LCX244FK(EL,K) part is unused and in its original packaging.

Return procedure for TC74LCX244FK(EL,K):

1.Submit a request within 90 days.

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

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