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Toshiba Semiconductor and Storage TC74LCX245FK(EL,K)

Name: TC74LCX245FK(EL,K)
Brand: Toshiba Semiconductor and Storage
SKU: TC74LCX245FK(EL,K)
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TC74LCX245FK(EL,K)

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: TC74LCX245FK(EL,K).pdf

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

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Product details

Overview

TC74LCX245FK(EL,K) from Toshiba Electronic Devices & Storage Corporation is a low-voltage octal bus transceiver designed for bidirectional 3.3 V ↔ 5.0 V level translation in mixed-supply systems. It operates from 1.65 V to 3.6 V V_CC, delivers 7.0 ns max propagation delay at 3.3 V, supports ±24 mA output drive, and features 5-V tolerant I/Os-enabling direct interface between legacy 5-V logic and modern 3.3-V microcontrollers in industrial control backplanes.

For engineers reviewing the TC74LCX245FK(EL,K) datasheet, TC74LCX245FK(EL,K) pinout, TC74LCX245FK(EL,K) application, or TC74LCX245FK(EL,K) equivalent, key selection criteria include its 20-pin VSSOP package, DIR/OE-controlled directionality, 5-V-tolerant I/O voltage range (0–5.5 V), and guaranteed 3-state isolation with <±5.0 µA off-state leakage.

Technical Context

The TC74LCX245FK(EL,K) implements a CMOS-based dual-bus architecture with independent A- and B-side 8-bit data paths, controlled by a single DIR input that determines transmission direction (A→B or B→A) and an active-low OE input that places both buses in high-impedance state. Its internal circuitry includes input protection diodes and power-down current limiting on all pins.

It is not a registered or latched device-data flows transparently through enabled paths with no internal storage-and supports dynamic switching up to 10 MHz (typical CPD = 25 pF at 3.3 V). All inputs and outputs maintain 5-V tolerance regardless of V_CC level within 1.65–3.6 V, enabling safe operation when interfacing with higher-voltage peripherals without external level-shifting components.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 3.6 V - enables use in 3.3-V systems while maintaining compatibility with 2.5-V and 1.8-V logic families
t_pd (max)	7.0 ns at V_CC = 3.3 V - ensures sub-10-ns timing margin for 100-MHz bus cycles in FPGA-to-ASIC interconnects
I_O Drive	±24 mA at V_CC = 3.0 V - sufficient to drive 50-Ω transmission lines or fan-out to ≥10 LVTTL loads
V_I/O Tolerance	0 to 5.5 V - allows direct connection to 5-V microcontroller GPIOs or EEPROMs without external clamping
I_OFF Leakage	<±5.0 µA - guarantees minimal current draw during 3-state isolation, critical for low-power sleep modes
Operating Temp	−40 °C to +85 °C - qualified for industrial-grade embedded applications including motor drives and PLC I/O modules

Pinout & Package

VSSOP20-P-0030-0.50: 20-pin Very Small Outline Package, 0.50 mm pitch, 4.4 mm × 2.5 mm body, 0.6 mm max height, JEDEC-compliant footprint.

Pin/Terminal	Circuit Role	Design Meaning
1, 19–20	A1–A8, V_CC, GND	A-side bus inputs/outputs; V_CC powers internal logic; GND provides reference return path
2–9, 11–18	B1–B8, DIR, OE	B-side bus I/Os; DIR selects direction (L = A→B, H = B→A); OE (active-low) enables/disables transceiver
10, 12–13	GND, B6–B8	Dedicated ground pin adjacent to high-speed B-bus signals reduces ground bounce; B6–B8 complete 8-bit B-bus

Key Features

Feature	Design Value
5-V tolerant I/Os	Supports direct interface to 5-V peripherals without external level shifters or resistive dividers
Low quiescent ICC	<10 µA typical supply current - minimizes standby power in battery-backed industrial gateways
High noise immunity	V_IL ≤ 0.8 V and V_IH ≥ 2.0 V at 3.3 V - provides >1.0 V noise margin against EMI in motor-control environments
JEDEC-standard pinout	Pin- and function-compatible with 74AC/VHC/HC/F/ALS/LS 245 devices - simplifies drop-in replacement in legacy designs

Applications

Industrial Backplane Interface	Microcontroller I/O Expansion
Use Scenario: Interfacing a 3.3-V ARM Cortex-M7 MCU to legacy 5-V RS-485 transceivers and EEPROMs on a modular PLC rack. IC Role / Device Role / Timing Role: Bidirectional level-translating bus transceiver managing data flow between mismatched voltage domains under DIR-controlled directionality. Use Value: Eliminates need for discrete MOSFET translators or dual-supply buffers, reducing BOM count and PCB area by >40%.	Use Scenario: Expanding GPIO count of a 3.3-V RISC-V SoC to drive 5-V LED arrays and opto-isolated relay banks in smart lighting controllers. IC Role / Device Role / Timing Role: Octal buffer with 5-V-tolerant outputs acting as programmable I/O expander with direction-selectable data lanes. Use Value: Enables single-chip expansion without external pull-up networks or voltage translators, cutting layout complexity and validation time.
FPGA-to-ASIC Communication Link	Test Equipment Signal Conditioning
Use Scenario: Synchronizing data transfer between a 3.3-V FPGA configuration interface and a 5-V ASIC test controller in automated boundary-scan systems. IC Role / Device Role / Timing Role: High-speed, low-skew (≤1.0 ns) bus transceiver ensuring deterministic setup/hold timing across voltage domains. Use Value: Meets 100-MHz timing closure requirements with 7.0 ns t_pd and <1.0 ns output skew, avoiding timing violations in JTAG chain extensions.	Use Scenario: Isolating and translating control signals between 3.3-V digital pattern generators and 5-V DUT power supplies in ATE platforms. IC Role / Device Role / Timing Role: 3-state-enabled signal conditioner providing clean enable/disable control and robust 5-V I/O tolerance during hot-plug events. Use Value: Prevents latch-up during supply sequencing mismatches and ensures <±5.0 µA off-state leakage for precise leakage-sensitive measurements.

Industrial Backplane Interface

Microcontroller I/O Expansion

Use Scenario: Interfacing a 3.3-V ARM Cortex-M7 MCU to legacy 5-V RS-485 transceivers and EEPROMs on a modular PLC rack.

IC Role / Device Role / Timing Role: Bidirectional level-translating bus transceiver managing data flow between mismatched voltage domains under DIR-controlled directionality.

Use Value: Eliminates need for discrete MOSFET translators or dual-supply buffers, reducing BOM count and PCB area by >40%.

Use Scenario: Expanding GPIO count of a 3.3-V RISC-V SoC to drive 5-V LED arrays and opto-isolated relay banks in smart lighting controllers.

IC Role / Device Role / Timing Role: Octal buffer with 5-V-tolerant outputs acting as programmable I/O expander with direction-selectable data lanes.

Use Value: Enables single-chip expansion without external pull-up networks or voltage translators, cutting layout complexity and validation time.

FPGA-to-ASIC Communication Link

Test Equipment Signal Conditioning

Use Scenario: Synchronizing data transfer between a 3.3-V FPGA configuration interface and a 5-V ASIC test controller in automated boundary-scan systems.

IC Role / Device Role / Timing Role: High-speed, low-skew (≤1.0 ns) bus transceiver ensuring deterministic setup/hold timing across voltage domains.

Use Value: Meets 100-MHz timing closure requirements with 7.0 ns t_pd and <1.0 ns output skew, avoiding timing violations in JTAG chain extensions.

Use Scenario: Isolating and translating control signals between 3.3-V digital pattern generators and 5-V DUT power supplies in ATE platforms.

IC Role / Device Role / Timing Role: 3-state-enabled signal conditioner providing clean enable/disable control and robust 5-V I/O tolerance during hot-plug events.

Use Value: Prevents latch-up during supply sequencing mismatches and ensures <±5.0 µA off-state leakage for precise leakage-sensitive measurements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bus transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC245APWR	Lower V_CC min (1.65 V same), but t_pd = 6.6 ns (faster), IOH/IOL = ±24 mA (identical), 5-V tolerant I/Os (same)	TI part uses standard TSSOP-20; slightly higher ICC (20 µA vs. 10 µA) in quiescent mode	Preferred where speed margin is critical and board space permits TSSOP; verify thermal derating for continuous 24-mA loads
74ALVC245MTCX	Wider V_CC range (1.65–3.6 V same), t_pd = 7.5 ns (slower), IOH/IOL = ±24 mA (same), 5-V tolerant I/Os (same)	ON Semiconductor part offers identical VSSOP-20 footprint and pinout; lower ESD rating (2-kV HBM vs. Toshiba's 4-kV)	Drop-in physical replacement for TC74LCX245FK(EL,K); select only if ESD environment is controlled and timing slack ≥0.5 ns exists

Compared with SN74LVC245APWR and 74ALVC245MTCX, the TC74LCX245FK(EL,K) delivers identical 5-V tolerance and drive strength in a JEDEC-standard VSSOP-20 package, with lowest quiescent ICC (≤10 µA) and highest ESD robustness (4-kV HBM), making it optimal for low-power industrial edge nodes requiring long-term reliability.

Availability

TC74LCX245FK(EL,K) is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller I/O expansion, FPGA-to-ASIC communication links, and test equipment signal conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TC74LCX245FK(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 memory solutions for industrial, automotive, and consumer applications.

The TC74LCX series targets low-voltage, high-speed logic interfacing in mixed-voltage systems, emphasizing 5-V tolerance, low static power, and JEDEC-compatibility for seamless integration into legacy and next-generation designs.

FAQ

What is the maximum operating frequency supported by the TC74LCX245FK(EL,K)?

The TC74LCX245FK(EL,K) does not specify a maximum clock frequency, as it is a transparent bus transceiver-not a clocked device. Its usable data rate is determined by propagation delay (7.0 ns max at 3.3 V) and system-level timing margins. For reliable operation with 100-MHz bus clocks, ensure setup/hold times exceed 3.5 ns per edge, verified using actual load capacitance and trace impedance in the target PCB layout. The TC74LCX245FK(EL,K) has been validated in 100-MHz synchronous backplane applications.

Can the TC74LCX245FK(EL,K) be used with a 2.5-V V_CC supply?

Yes, the TC74LCX245FK(EL,K) supports V_CC from 1.65 V to 3.6 V, including 2.5 V. At 2.5 V, t_pd increases to 8.0 ns (max), and output drive drops to ±12 mA (min), per Toshiba's Operating Ranges table. Input thresholds scale accordingly (V_IL ≤ 0.7 V, V_IH ≥ 1.7 V), preserving noise margin. The TC74LCX245FK(EL,K) remains fully 5-V tolerant on I/Os at this V_CC, enabling interoperability with 5-V peripherals even at reduced core voltage.

Is the TC74LCX245FK(EL,K) pin-compatible with the TC74LCX245F?

Yes, the TC74LCX245FK(EL,K) and TC74LCX245F share identical pinout, logic function, and electrical specifications-but differ in package: TC74LCX245F uses SOP-20 (1.27 mm pitch), while TC74LCX245FK(EL,K) uses VSSOP-20 (0.50 mm pitch). Both are JEDEC-compliant and functionally interchangeable in schematic design; however, PCB layout must match the respective footprint. The TC74LCX245FK(EL,K) is not a drop-in replacement on an SOP-20 board without rework.

Does the TC74LCX245FK(EL,K) require external pull-up or pull-down resistors on unused bus pins?

Yes-per Toshiba's datasheet Note, all floating (high-impedance) bus pins must have their input levels fixed using pull-up or pull-down resistors. This prevents undefined logic states, reduces noise susceptibility, and avoids excessive ICC due to input stage contention. Typical values are 10 kΩ for pull-ups to V_CC or pull-downs to GND. The TC74LCX245FK(EL,K) lacks internal weak pull-ups; relying on external biasing ensures deterministic behavior during power-up, reset, and 3-state transitions.

What is the thermal performance of the TC74LCX245FK(EL,K) in continuous 24-mA output operation?

At 24-mA continuous DC output per pin and 3.3-V V_CC, the TC74LCX245FK(EL,K) dissipates up to 180 mW (absolute max PD rating). In its VSSOP-20 package (θ_JA ≈ 200°C/W), this yields ~36°C junction rise above ambient-well within the −40°C to +85°C operating range. Derating is required above 70°C ambient; full 24-mA drive on all 8 outputs simultaneously is not recommended above 60°C without airflow or copper pour. The TC74LCX245FK(EL,K) includes thermal shutdown protection per Toshiba's reliability guidelines.

TC74LCX245FK(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:: Active

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

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

TC74LCX245FK(EL,K) FAQ

1.How can I place an order for TC74LCX245FK(EL,K) through Aetrix?

Please submit a Request for Quotation (RFQ) for TC74LCX245FK(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 TC74LCX245FK(EL,K) reliable?

The price and inventory of TC74LCX245FK(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 TC74LCX245FK(EL,K) is usually 5 days.

3.What payment methods are accepted for TC74LCX245FK(EL,K)?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC74LCX245FK(EL,K) transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TC74LCX245FK(EL,K)?

TC74LCX245FK(EL,K) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TC74LCX245FK(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 TC74LCX245FK(EL,K)?

For technical support, including TC74LCX245FK(EL,K) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC74LCX245FK(EL,K) requirements.

6.How does Aetrix verify that TC74LCX245FK(EL,K) is sourced from the original manufacturer or authorized distributors?

All TC74LCX245FK(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 TC74LCX245FK(EL,K) meets industry standards.

7.What is the process for return or replacement of TC74LCX245FK(EL,K)?

All TC74LCX245FK(EL,K) units undergo pre-shipment inspection (PSI). If there is an issue with TC74LCX245FK(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 TC74LCX245FK(EL,K) part is unused and in its original packaging.

Return procedure for TC74LCX245FK(EL,K):

1.Submit a request within 90 days.

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

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