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Renesas 74FCT245ATPYG8
- Part No.:
- 74FCT245ATPYG8
- Manufacturer:
- Renesas
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74FCT245ATPYG8.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
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Product details
Overview
74FCT245ATPYG8 from Renesas Electronics is a FAST CMOS octal bidirectional transceiver with TTL-compatible inputs/outputs, 5V supply operation, ±1µA max input leakage, -15mA IOH / 64mA IOL drive strength, and industrial temperature range (-40°C to +85°C). It enables asynchronous two-way data bus communication in backplane and board-level interconnect applications.
For engineers reviewing the 74FCT245ATPYG8 datasheet, 74FCT245ATPYG8 pinout, 74FCT245ATPYG8 application, or 74FCT245ATPYG8 equivalent, key selection criteria include direction control (T/R), 3-state output enable (OE), high-drive capability for bus loading, and SOIC-20/TSSOP-20 package compatibility with legacy 74-series footprints.
Technical Context
The 74FCT245ATPYG8 implements an asynchronous bidirectional data path controlled by separate T/R (transmit/receive) and OE (output enable) inputs. Its dual-metal CMOS process ensures true TTL voltage compatibility (VIH = 2V min, VIL = 0.8V max) while delivering rail-to-rail output swing (VOH = 2.4V min at -6mA, VOL = 0.55V max at 48mA).
Propagation delay is guaranteed ≤4.1 ns (CL = 50pF, RL = 500Ω), with output enable/disable times ≤5.8 ns and ≤4.8 ns respectively. The device supports live insertion via power-off disable outputs and meets JEDEC Std. 18 and MIL-STD-883 Class B requirements when ordered in military-grade variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5.0V ±5% - fixed single-rail operation compatible with legacy 5V TTL/CMOS systems |
| Input Leakage | ≤±1 µA max - ensures minimal bus loading and signal integrity in high-density interconnects |
| Output Drive | -15mA IOH / +64mA IOL - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| Propagation Delay | ≤4.1 ns (A↔B) - supports >200 MHz data rates in point-to-point or stubbed bus topologies |
| Operating Temp | -40°C to +85°C - qualified for industrial environments including factory automation and telecom infrastructure |
| Package | TSSOP-20 (PYG20) - 0.65mm pitch, 6.5mm × 4.4mm footprint, RoHS-compliant green finish |
| Logic Family | FCT - FAST CMOS with TTL input thresholds and CMOS power efficiency (ICC ≤ 1 mA quiescent) |
Pinout & Package
74FCT245ATPYG8 is packaged in a 20-pin Thin Shrink Small Outline Package (TSSOP-20, suffix PYG), pin-compatible with industry-standard SOIC-20 and SSOP-20 footprints. The package features gull-wing leads, moisture sensitivity level (MSL) 1, and is rated for reflow per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-Low Output Enable | Drives all A and B ports into high-Z when HIGH; enables bidirectional flow when LOW |
| 2–9 (A0–A7) | Side-A I/O Ports | Tri-stateable inputs/outputs; connected to local bus or microcontroller data lines |
| 10 (GND) | Ground Reference | Primary return path for logic and output current; requires low-inductance PCB connection |
| 11–18 (B0–B7) | Side-B I/O Ports | Tri-stateable inputs/outputs; interfaces to peripheral bus, memory, or FPGA I/O banks |
| 19 (T/R) | Transmit/Receive Control | HIGH = A→B data flow; LOW = B→A data flow; asynchronous with respect to clock domains |
| 20 (VCC) | Power Supply | +5V supply input; requires local 0.1µF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Input Thresholds | VIH = 2.0V min, VIL = 0.8V max - interoperates directly with 74LS, 74ALS, and microcontroller GPIO without level shifters |
| High-Drive Outputs | 64mA sink capability - drives up to 20 standard TTL loads or long PCB traces with minimal signal degradation |
| Live Insertion Support | Outputs enter high-Z when VCC = 0V - allows hot-plug replacement in modular backplane systems without bus contention |
| Low Power Consumption | ICC ≤ 1 mA at static conditions - reduces thermal load in dense board layouts and extends system-level power budget |
| JEDEC Std. 18 Compliance | Validated against industry-standard AC/DC timing and interface requirements - simplifies qualification for industrial OEM designs |
Applications
| Industrial Backplane Interconnect | Microcontroller Bus Expansion |
|---|---|
Use Scenario: Bidirectional data transfer between CPU module and I/O carrier board in modular PLC chassis. IC Role / Device Role / Timing Role: Level-shifting transceiver isolating control and data buses while maintaining timing integrity across slots. Use Value: Enables deterministic 8-bit parallel communication with <4.1 ns propagation delay and no external pull-ups required. | Use Scenario: Extending 8-bit data bus from an MCU with limited GPIO to external peripherals like ADCs, DACs, or display drivers. IC Role / Device Role / Timing Role: Direction-controlled buffer managing data flow between MCU port and peripheral bus under software control. Use Value: Eliminates need for discrete MOSFET switches or dual unidirectional buffers, reducing BOM count and layout area. |
| Legacy System Upgrade Interface | Test Equipment Signal Routing |
Use Scenario: Interfacing modern 3.3V FPGA I/O banks to legacy 5V TTL subsystems in avionics test fixtures. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional translator preserving signal polarity and timing margins during mixed-voltage upgrades. Use Value: Supports direct connection without external resistors or clamping diodes due to 5V-tolerant inputs and 5V outputs. | Use Scenario: Reconfigurable signal routing matrix in automated test equipment where DUT I/O must be dynamically connected to stimulus or measurement channels. IC Role / Device Role / Timing Role: Electrically isolated bidirectional switch enabling flexible path assignment under firmware control. Use Value: Provides 8 independent, direction-controllable paths with <6 ns enable/disable latency for rapid test sequence changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F245N | Lower drive (IOH = -15mA, IOL = 64mA same), higher ICC (2 mA typ), no live-insertion support | Limited to non-hot-swap systems; lacks power-off high-Z guarantee | Select when cost is primary and live insertion is not required |
| 74LVC245APW | 3.3V-only supply, lower VOH (2.4V min), smaller TSSOP-20 package (4.4mm × 2.5mm) | Requires level translation for 5V systems; unsuitable for direct 5V bus interfacing | Select only for 3.3V-native designs with strict space constraints |
Compared with SN74F245N and 74LVC245APW, the 74FCT245ATPYG8 uniquely combines 5V operation, live-insertion capability, and industrial temperature rating - making it the preferred choice for ruggedized backplane and upgrade-interface applications where reliability and voltage compatibility are critical.
Availability
74FCT245ATPYG8 is available at Aetrix Electronics and suitable for industrial backplane interconnect, microcontroller bus expansion, and legacy system upgrade interface applications requiring stable component supply and long-term lifecycle support.
Supply support for 74FCT245ATPYG8 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
Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and infrastructure markets.
The 74FCT245ATPYG8 belongs to Renesas' legacy FCT logic family, designed specifically for robust, high-speed 5V bus interfacing in mission-critical industrial and military systems where reliability, timing precision, and mixed-voltage interoperability are essential.
FAQ
What is the operating voltage range for the 74FCT245ATPYG8?
The 74FCT245ATPYG8 operates at a nominal supply voltage of 5.0V ±5%, with absolute maximum ratings from –0.5V to +7.0V on input pins and –0.5V to VCC+0.5V on I/O terminals. It is not rated for 3.3V operation, and applying 3.3V to VCC will result in undefined logic behavior and potential functional failure. The 74FCT245ATPYG8 must be powered from a regulated 5V source to meet its specified VOH, VOL, and timing parameters.
Does the 74FCT245ATPYG8 support live insertion, and how is this implemented?
Yes, the 74FCT245ATPYG8 supports live insertion through its power-off disable feature: when VCC = 0V, all outputs enter a high-impedance state regardless of OE or T/R logic levels. This prevents bus contention during hot-swap events in modular chassis systems. The behavior is inherent to the FCT process design and does not require external circuitry. This functionality is verified per MIL-STD-883 Class B test methods and is guaranteed across the full industrial temperature range for the 74FCT245ATPYG8.
What are the timing differences between the 74FCT245ATPYG8 and the base 74FCT245T variant?
The 74FCT245ATPYG8 ('AT' speed grade) offers improved timing over the standard 'T' variant: propagation delay is reduced from ≤4.6 ns to ≤4.1 ns, and output enable/disable times improve from ≤6.2 ns / ≤5.0 ns to ≤5.8 ns / ≤4.8 ns respectively. These gains stem from tighter process control and characterization at the 'AT' grade level. All other electrical and functional specifications - including pinout, voltage thresholds, drive strength, and package - remain identical between the 74FCT245ATPYG8 and 74FCT245TPYG8.
Can the 74FCT245ATPYG8 be used in a 3.3V system?
No, the 74FCT245ATPYG8 is not designed for 3.3V operation. Its internal circuitry, input thresholds, and output drive characteristics are optimized for 5.0V ±5% supply. Applying 3.3V to VCC results in insufficient noise margin (VIH specification requires ≥2.0V, but VOL rises above 0.55V), degraded propagation delay, and possible metastability on T/R and OE control lines. For 3.3V systems, Renesas recommends the 74LVC245A series - but those parts are not drop-in replacements for the 74FCT245ATPYG8 due to different voltage domains and pin-compatible limitations.
What package type does the 'PYG8' suffix indicate for the 74FCT245ATPYG8?
The 'PYG8' suffix denotes a 20-pin Thin Shrink Small Outline Package (TSSOP-20) with green (RoHS-compliant) finish and tape-and-reel packaging ('8' = reel quantity). The PYG package has a 0.65mm lead pitch, 6.5mm × 4.4mm body size, and gull-wing leads compatible with standard SMT reflow profiles. It is functionally and pinout-identical to the SOIC-20 (PSG20) and SSOP-20 (PYG20) variants of the 74FCT245AT, differing only in physical dimensions and thermal performance.
74FCT245ATPYG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74FCT245ATPYG8 FAQ
1.How can I place an order for 74FCT245ATPYG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT245ATPYG8 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 74FCT245ATPYG8 reliable?
The price and inventory of 74FCT245ATPYG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT245ATPYG8 is usually 5 days.
3.What payment methods are accepted for 74FCT245ATPYG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT245ATPYG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT245ATPYG8?
74FCT245ATPYG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT245ATPYG8 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 74FCT245ATPYG8?
For technical support, including 74FCT245ATPYG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT245ATPYG8 requirements.
6.How does Aetrix verify that 74FCT245ATPYG8 is sourced from the original manufacturer or authorized distributors?
All 74FCT245ATPYG8 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 74FCT245ATPYG8 meets industry standards.
7.What is the process for return or replacement of 74FCT245ATPYG8?
All 74FCT245ATPYG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT245ATPYG8, 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 74FCT245ATPYG8 part is unused and in its original packaging.
Return procedure for 74FCT245ATPYG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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