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Toshiba Semiconductor and Storage 74VHCT245AFT
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- Part No.:
- 74VHCT245AFT
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHCT245AFT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:12,963
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Product details
Overview
74VHCT245AFT from Toshiba Electronic Devices & Storage Corporation is an advanced high-speed CMOS octal bus transceiver with TTL-compatible inputs, 5 V supply operation (4.5–5.5 V), 4.9 ns typical propagation delay, and AEC-Q100 qualified automotive-grade reliability. It enables bidirectional data flow between two 8-bit buses under DIR control and supports 3.3 V ↔ 5 V level translation in isolated bus systems.
For engineers reviewing the 74VHCT245AFT datasheet, 74VHCT245AFT pinout, 74VHCT245AFT application, or 74VHCT245AFT equivalent, key selection criteria include its -40 °C to +125 °C operating range, 0.1 µA max 3-state leakage, power-down protection on all I/Os, and TSSOP20B package compatibility with legacy 74-series 245 logic.
Technical Context
The 74VHCT245AFT implements a dual-bus, direction-controlled transceiver architecture using silicon-gate C2MOS technology. Its DIR input selects data flow direction (A→B or B→A), while the active-low G input enables or disables both bus ports into high-impedance states.
It features balanced tPLH/tPHL propagation delays (≈4.9 ns typ.), low-noise output switching (VOLP ≤ 1.5 V), and robust voltage tolerance: inputs/outputs withstand 0–5.5 V independent of VCC, enabling safe interfacing across mismatched supply domains including battery-backup scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - Ensures stable operation across industrial and automotive 5 V rails with ±10% tolerance. |
| Propagation Delay | 4.9 ns (typ.) at VCC = 5.0 V - Enables high-throughput data transfer in timing-critical bus interfaces. |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood automotive and extended industrial environments. |
| I/O Voltage Range | 0–5.5 V - Allows safe connection to 3.3 V logic without level shifters and prevents damage during supply sequencing. |
| Quiescent Current | 4.0 µA (max) at 25 °C - Minimizes standby power in always-on embedded systems. |
| TTL Input Compatibility | VIL ≤ 0.8 V, VIH ≥ 2.0 V - Directly interfaces with legacy 5 V TTL outputs without pull-up resistors. |
| 3-State Leakage | 0.1 µA (max) - Maintains bus integrity during isolation, critical for multi-drop shared-bus architectures. |
Pinout & Package
TSSOP20B (Thin Shrink Small Outline Package, 20-pin, 0.65 mm pitch, 6.5 × 4.4 mm footprint, 0.071 g typical weight).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (G) | Active-low Output Enable | Drives both A and B ports into high-impedance when HIGH; required for bus arbitration and isolation. |
| 2–9 (A0–A7) | Bus A Data Inputs/Outputs | 8-bit bidirectional port; direction determined by DIR; tolerates 0–5.5 V regardless of VCC state. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and I/O current; must be low-impedance for noise immunity. |
| 11–18 (B0–B7) | Bus B Data Inputs/Outputs | 8-bit bidirectional port mirrored to A-side; electrically identical and symmetrical in timing and drive strength. |
| 19 (DIR) | Direction Control Input | LOW: A→B data flow; HIGH: B→A data flow; latched internally, no metastability risk at valid edges. |
| 20 (VCC) | Positive Supply | 5 V nominal supply; powers internal logic and output drivers; decoupling capacitor required per datasheet layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Rev. H qualified | Validated for automotive applications including engine control, body electronics, and infotainment gateways. |
| Power-down protection | Prevents latch-up and back-drive damage when VCC = 0 V but I/O pins are driven externally (e.g., hot-swap, backup power). |
| Pin/function compatible with 74ACT/HCT/AHCT245 | Enables drop-in replacement in existing designs without PCB or firmware changes; maintains identical truth table and timing behavior. |
| Balanced propagation delays (tPLH ≈ tPHL) | Reduces skew-induced setup/hold violations in synchronous bus transfers and simplifies timing margin analysis. |
| Low dynamic noise (VOLP ≤ 1.5 V) | Minimizes ground bounce and crosstalk in dense PCB layouts with multiple parallel transceivers. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Backplane Interface |
|---|---|
|
Use Scenario: Isolating CAN/LIN microcontroller I/O from high-noise 12 V chassis bus lines while translating between 3.3 V MCU logic and 5 V sensor interface levels. IC Role / Device Role / Timing Role: Bidirectional level-shifting bus transceiver managing data exchange between MCU and external peripheral clusters via DIR-controlled direction switching. Use Value: Eliminates need for discrete level shifters and reduces component count; AEC-Q100 qualification ensures reliability over full vehicle lifetime. |
Use Scenario: Connecting modular I/O expansion cards to a central controller in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Octal bus isolator enabling hot-swappable module detection and data routing between controller and field I/O banks. Use Value: High-impedance disable (via G) prevents bus contention during card insertion/removal; wide temperature range supports uncooled cabinet operation. |
| Medical Diagnostic Imaging Subsystem | Test Equipment Digital Pattern Generator |
|
Use Scenario: Interfacing FPGA-based image processing core (3.3 V I/O) with legacy 5 V analog front-end ASICs in ultrasound or MRI signal chain modules. IC Role / Device Role / Timing Role: Synchronous bidirectional data bridge synchronizing pixel data streams between domains with precise edge-aligned timing. Use Value: 4.9 ns propagation delay and matched tPLH/tPHL ensure sub-10 ns timing alignment critical for real-time image reconstruction pipelines. |
Use Scenario: Driving multiple DUT (device-under-test) pins simultaneously from a pattern memory in automated test equipment with strict timing margins. IC Role / Device Role / Timing Role: High-speed bus driver/receiver providing controlled slew rate and low skew across eight parallel test channels. Use Value: Low VOLP (≤1.5 V) and 0.1 µA off-state leakage prevent false triggering and maintain signal fidelity at 100+ MHz test frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74VHCT245PW | Same VHCT family, identical AC/DC specs, same TSSOP-20 package, but manufactured by Texas Instruments; not AEC-Q100 qualified. | Lacks automotive qualification; suitable for commercial/industrial use only; requires revalidation for automotive deployment. | Select when AEC-Q100 compliance is unnecessary and TI supply chain preference applies. |
| 74LVC245AT20 | Lower VCC range (1.65–5.5 V), higher max speed (2.3 ns typ.), but only rated to +85 °C; lacks power-down protection and I/O voltage tolerance beyond VCC. | Not suitable for automotive or extended-temp industrial use; cannot safely interface 5.5 V signals when VCC = 3.3 V. | Select only for cost-sensitive consumer applications requiring wider voltage flexibility below 5 V and ambient temperatures ≤85 °C. |
Compared with SN74VHCT245PW and 74LVC245AT20, the 74VHCT245AFT uniquely combines AEC-Q100 qualification, 125 °C operation, and 0–5.5 V I/O tolerance-making it the sole choice for safety-critical automotive and harsh-environment industrial bus isolation where reliability and voltage robustness are non-negotiable.
Availability
74VHCT245AFT is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC backplanes, medical imaging subsystems, and test equipment digital pattern generators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74VHCT245AFT 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 components for automotive, industrial, and computing applications, with emphasis on quality, longevity, and functional safety.
The 74VHCT245AFT belongs to Toshiba's VHCT logic family, engineered specifically for high-speed, low-power, automotive-grade bus interfacing where robustness against supply mismatch, thermal stress, and ESD is mandatory.
FAQ
What is the maximum operating temperature range for the 74VHCT245AFT?
The 74VHCT245AFT is rated for continuous operation from -40 °C to +125 °C, meeting AEC-Q100 Grade 1 requirements. This range is validated across all electrical parameters including propagation delay, leakage current, and output drive strength, making it suitable for under-hood automotive and high-ambient industrial environments where standard commercial logic would fail.
Does the 74VHCT245AFT support 3.3 V to 5 V level translation?
Yes, the 74VHCT245AFT supports bidirectional level translation between 3.3 V and 5 V systems. Its inputs accept TTL-compatible thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and its I/O pins tolerate 0–5.5 V regardless of VCC, enabling safe connection to 3.3 V logic while powered from 5 V - a key feature confirmed in the Functional Description and Absolute Maximum Ratings sections of the datasheet.
Is the 74VHCT245AFT pin-compatible with other 74-series 245 transceivers?
Yes, the 74VHCT245AFT is pin- and function-compatible with industry-standard 74ACT, 74HCT, and 74AHCT245 devices in the same TSSOP20B package. The Truth Table, Pin Assignment, and Features sections explicitly confirm identical pinout, logic behavior, and timing characteristics - enabling direct substitution without PCB or firmware modification.
What protection features does the 74VHCT245AFT include for system-level robustness?
The 74VHCT245AFT includes power-down protection on all inputs and outputs, allowing 0–5.5 V to be applied to any pin even when VCC = 0 V - preventing latch-up or damage during hot-swap, battery backup, or supply sequencing events. It also provides balanced tPLH/tPHL delays and low dynamic noise (VOLP ≤ 1.5 V) to reduce ground bounce and timing skew in dense layouts.
Can the 74VHCT245AFT be used in a system where VCC is 3.3 V?
No - the 74VHCT245AFT is specified only for VCC = 4.5–5.5 V operation. Its DC and AC characteristics, including VOH, VOL, propagation delay, and input thresholds, are guaranteed exclusively within that range. Using 3.3 V violates the Operating Ranges specification and risks incorrect logic levels, excessive delay, or functional failure; for 3.3 V systems, consider the 74LVC245A instead.
74VHCT245AFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- 74VHCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74VHCT245AFT FAQ
1.How can I place an order for 74VHCT245AFT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT245AFT 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 74VHCT245AFT reliable?
The price and inventory of 74VHCT245AFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT245AFT is usually 5 days.
3.What payment methods are accepted for 74VHCT245AFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT245AFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT245AFT?
74VHCT245AFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT245AFT 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 74VHCT245AFT?
For technical support, including 74VHCT245AFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT245AFT requirements.
6.How does Aetrix verify that 74VHCT245AFT is sourced from the original manufacturer or authorized distributors?
All 74VHCT245AFT 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 74VHCT245AFT meets industry standards.
7.What is the process for return or replacement of 74VHCT245AFT?
All 74VHCT245AFT units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT245AFT, 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 74VHCT245AFT part is unused and in its original packaging.
Return procedure for 74VHCT245AFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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