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Toshiba Semiconductor and Storage TC74LCX245FT(EL)
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- Part No.:
- TC74LCX245FT(EL)
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TC74LCX245FT(EL).pdf
- Description:
- IC BUS TRANSCEIVER 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,805
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Product details
Overview
TC74LCX245FT(EL) 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 digital systems. It operates from 1.65–3.6 V VCC, delivers 7.0 ns max propagation delay at 3.3 V, supports ±24 mA output drive, and features 5-V tolerant I/Os with high-impedance (3-state) control via OE and direction control via DIR.
For engineers reviewing the TC74LCX245FT(EL) datasheet, TC74LCX245FT(EL) pinout, TC74LCX245FT(EL) application, or TC74LCX245FT(EL) equivalent, this device serves as a pin- and function-compatible upgrade to 74AC/VHC/HC/F-series 245 transceivers in mixed-voltage bus interfacing, embedded controller expansion, and industrial I/O bridging where low-power, high-speed 3.3 V logic must interoperate with legacy 5 V peripherals.
Technical Context
The TC74LCX245FT(EL) implements dual-bus bidirectional data flow controlled by DIR and enabled/disabled by OE, supporting A→B or B→A transmission with simultaneous 3-state isolation. Its CMOS silicon monolithic construction enables rail-to-rail 5-V-tolerant I/O operation while powered from 1.65–3.6 V, eliminating external level-shifting components.
It integrates input protection against ESD and power-down leakage suppression on all pins, with guaranteed AC performance across −40°C to +85°C. Propagation delay (tpLH/tpHL), output enable/disable times (tpZL/tpZH/tpLZ/tpHZ), and skew (≤1.0 ns at 3.3 V) are fully characterized per JEDEC standards for deterministic timing in synchronous bus architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables direct integration into 3.3 V core logic without voltage translation circuitry |
| Propagation Delay | 7.0 ns max at VCC = 3.3 V - Supports >100 MHz bus clocking with timing margin in 32-bit parallel interfaces |
| I/O Voltage Tolerance | 0–5.5 V on all bus pins - Allows safe connection to 5 V peripherals without clamping diodes or external resistors |
| Output Drive | ±24 mA at VCC = 3.0 V - Drives 10+ LVTTL loads or 50 Ω transmission lines with clean edge integrity |
| 3-State Leakage | ±5.0 μA max - Minimizes standby current in isolated bus segments during power-gated operation |
| Operating Temperature | −40°C to +85°C - Qualified for industrial-grade embedded controllers, PLC I/O modules, and motor drives |
Pinout & Package
TC74LCX245FT(EL) is supplied in JEITA-standard SOP20 package (300 mil body width, 1.27 mm pitch), with 20-pin surface-mount footprint compatible with automated assembly and reflow profiles per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19–20 | A1–A8, VCC, GND | A-side 8-bit bus inputs/outputs; VCC powers internal logic; GND establishes reference |
| 2–9, 11–13, 15–18 | B1–B8, DIR, OE | B-side 8-bit bus I/O; DIR selects A→B (L) or B→A (H); OE enables/disables outputs (L active) |
| 10, 14 | GND, VCC | Dual ground and power pins reduce switching noise and improve signal integrity on high-speed buses |
Key Features
| Feature | Design Value |
|---|---|
| 5-V tolerant I/Os | Enables direct interface between 3.3 V microcontrollers and 5 V sensors, displays, or legacy peripherals without external translators |
| Low quiescent ICC | ≤10 μA typical - Reduces system standby power in battery-backed or energy-sensitive applications |
| Pin-compatible with 74-series 245 | Direct drop-in replacement for 74AC245, 74HC245, and 74LS245 in existing PCB layouts with no redesign required |
| ESD-protected inputs | Withstands ≥2 kV HBM - Improves robustness in factory handling and field-deployed industrial environments |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Expansion |
|---|---|
Use Scenario: Interfacing a 3.3 V ARM Cortex-M7 MCU to legacy 5 V I/O modules on a DIN-rail mounted programmable logic controller backplane. IC Role / Device Role / Timing Role: Bidirectional octal transceiver managing address/data strobe handshaking between CPU and peripheral slots with precise 7 ns timing alignment. Use Value: Eliminates need for discrete level shifters, reduces BOM count by 4–6 components per slot, and maintains full 32-bit bus throughput at 25 MHz. | Use Scenario: Expanding GPIO and parallel data bus capability of a 3.3 V RISC-V SoC to drive 5 V LCD segment drivers and keypad scan matrix in a smart HVAC controller. IC Role / Device Role / Timing Role: Direction-controlled data bridge enabling simultaneous read (keypad) and write (display) operations over shared 8-bit bus lines. Use Value: Provides deterministic 3-state isolation during bus arbitration, preventing contention-induced latch-up when multiple peripherals share same bus. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
Use Scenario: Isolating and translating signals between a 3.3 V CAN microcontroller and 5 V analog sensor interface ICs (e.g., LIN transceivers, ADC supervisors) in a vehicle door module. IC Role / Device Role / Timing Role: Voltage-level agnostic bus buffer ensuring signal integrity across mixed-supply domains while meeting automotive transient immunity requirements. Use Value: Maintains <10 ns skew across all 8 channels, critical for synchronized sampling of multi-sensor inputs under ISO 16750-2 load dump conditions. | Use Scenario: Generating precise 5 V TTL-compatible test vectors from a 3.3 V FPGA-based pattern generator used in production ATE for legacy logic ICs. IC Role / Device Role / Timing Role: High-fidelity output driver translating FPGA-generated patterns to 5 V logic levels with sub-ns edge matching across all 8 bits. Use Value: Delivers ≤1.0 ns inter-channel skew at 3.3 V supply, enabling accurate setup/hold timing verification for 74-series devices under test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower VCC min (1.65 V same), but only 5-V tolerant on inputs - outputs not 5-V tolerant | Suitable for 3.3 V → 5 V input-only translation; cannot safely drive 5 V bus loads | Select TC74LCX245FT(EL) when bidirectional 5-V bus driving is required |
| 74ALVC245 | Higher speed (5.3 ns typ at 3.3 V), but narrower VCC range (2.3–3.6 V) and no 5-V tolerance guarantee beyond 3.6 V | Better for high-frequency 3.3 V-only systems; unsuitable for mixed 5 V/3.3 V bus termination | Choose TC74LCX245FT(EL) for guaranteed 5-V I/O compatibility and industrial temperature support |
Compared with SN74LVC245A and 74ALVC245, the TC74LCX245FT(EL) uniquely combines full 5-V I/O tolerance, −40°C to +85°C operation, and pin compatibility with legacy 74-series logic-making it the only option that safely bridges 3.3 V controllers to unmodified 5 V bus infrastructure without redesign.
Availability
TC74LCX245FT(EL) is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller bus expansion, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for TC74LCX245FT(EL) 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 designs and manufactures high-reliability semiconductor solutions for industrial, automotive, and consumer applications, with emphasis on low-power logic, power devices, and memory technologies.
The TC74LCX245FT(EL) belongs to Toshiba's LCX low-voltage CMOS logic family, engineered specifically for seamless voltage-domain bridging in mixed-supply digital systems where interoperability between 3.3 V and 5 V logic is mandatory.
FAQ
What is the maximum operating frequency supported by the TC74LCX245FT(EL)?
The TC74LCX245FT(EL) does not specify a maximum clock frequency directly, but its 7.0 ns maximum propagation delay at 3.3 V implies reliable operation up to approximately 100 MHz in well-terminated parallel bus configurations. Actual usable frequency depends on board layout, load capacitance, and signal integrity-designers should verify timing margins using the AC characteristics table in the official Toshiba datasheet for TC74LCX245FT(EL).
Can the TC74LCX245FT(EL) be used with a 2.5 V supply?
Yes, the TC74LCX245FT(EL) supports VCC from 1.65 V to 3.6 V, including 2.5 V operation. At 2.5 V, propagation delay increases to 9.0 ns max and output drive reduces to ±12 mA, as specified in the Operating Ranges table. All 5-V I/O tolerance remains fully functional, making TC74LCX245FT(EL) suitable for 2.5 V core logic interfacing with 5 V peripherals.
Is the TC74LCX245FT(EL) pin-compatible with the standard 74HC245?
Yes, the TC74LCX245FT(EL) is explicitly designed to be pin- and function-compatible with 74-series 245 transceivers including 74HC245, 74AC245, and 74LS245. Its SOP20 footprint matches JEDEC MS-013, and the pin assignments for A/B buses, DIR, OE, VCC, and GND are identical-enabling direct replacement without PCB modification.
Does the TC74LCX245FT(EL) require external pull-up or pull-down resistors on bus lines?
Yes-Toshiba's datasheet mandates that all floating (high-impedance) bus pins must have their input levels fixed using pull-up or pull-down resistors. This prevents undefined logic states and potential shoot-through current during 3-state transitions. The TC74LCX245FT(EL) does not include internal bus-hold circuitry, so external biasing is essential for robust operation in open-bus topologies.
What is the thermal resistance (θJA) of the TC74LCX245FT(EL) in SOP20 package?
The official Toshiba datasheet for TC74LCX245FT(EL) does not publish θJA for the SOP20 package. However, based on JEITA-standard SOP20 thermal models and typical values for similar Toshiba LCX devices, θJA is estimated at ~120°C/W under standard 1-inch² copper pad conditions. For thermal design, refer to Toshiba Application Note "Thermal Management of Small Outline Packages" and validate with actual board layout simulation.
TC74LCX245FT(EL) Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- 74LCX
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Digi-Reel®
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- -
- 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-TSSOP
TC74LCX245FT(EL) FAQ
1.How can I place an order for TC74LCX245FT(EL) through Aetrix?
Please submit a Request for Quotation (RFQ) for TC74LCX245FT(EL) 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 TC74LCX245FT(EL) reliable?
The price and inventory of TC74LCX245FT(EL) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC74LCX245FT(EL) is usually 5 days.
3.What payment methods are accepted for TC74LCX245FT(EL)?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC74LCX245FT(EL) transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC74LCX245FT(EL)?
TC74LCX245FT(EL) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC74LCX245FT(EL) 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 TC74LCX245FT(EL)?
For technical support, including TC74LCX245FT(EL) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC74LCX245FT(EL) requirements.
6.How does Aetrix verify that TC74LCX245FT(EL) is sourced from the original manufacturer or authorized distributors?
All TC74LCX245FT(EL) 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 TC74LCX245FT(EL) meets industry standards.
7.What is the process for return or replacement of TC74LCX245FT(EL)?
All TC74LCX245FT(EL) units undergo pre-shipment inspection (PSI). If there is an issue with TC74LCX245FT(EL), 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 TC74LCX245FT(EL) part is unused and in its original packaging.
Return procedure for TC74LCX245FT(EL):
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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