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Renesas 74FCT245CTPYG8
- Part No.:
- 74FCT245CTPYG8
- Manufacturer:
- Renesas
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74FCT245CTPYG8.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,974
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Product details
Overview
74FCT245CTPYG8 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 or board-level interconnect applications.
For engineers reviewing the 74FCT245CTPYG8 datasheet, 74FCT245CTPYG8 pinout, 74FCT245CTPYG8 application, or 74FCT245CTPYG8 equivalent, key selection criteria include direction control (T/R), 3-state output enable (OE), high-drive capability for bus loading, and SOIC-20 package compatibility with legacy 74-series layouts.
Technical Context
The 74FCT245CTPYG8 implements an asynchronous bidirectional data path between two 8-bit buses using a single T/R control signal to determine flow direction (A→B on T/R = HIGH; B→A on T/R = LOW). Its OE input operates active-low to place both A and B ports in high-impedance state independently of direction.
Designed in advanced dual-metal CMOS, it delivers true TTL voltage compatibility (VOH = 3.3V typ., VOL = 0.3V typ.) while meeting JEDEC Std. 18 and MIL-STD-883 Class B requirements. Propagation delay is 1.5–4.1 ns (A↔B) under CL = 50pF, RL = 500Ω conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5.0V ±5% - fixed single-rail operation; no dual-supply or level-shifting capability |
| IOH / IOL | -15mA / +64mA - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| tPLH / tPHL | 1.5–4.1 ns - supports >200 MHz bus toggle rates in point-to-point configurations |
| VIH / VIL | 2.0V min / 0.8V max - fully compatible with standard TTL logic thresholds |
| Input Leakage | ≤±1 µA max - ensures stable bus hold during high-Z states and low power standby |
| Operating Temp | -40°C to +85°C - qualified for industrial environments including factory automation and telecom infrastructure |
| CIN / COUT | 6–10 pF / 8–12 pF - low capacitance minimizes signal distortion and timing skew across all 16 I/Os |
Pinout & Package
74FCT245CTPYG8 is packaged in a 20-pin Small Outline IC (SOIC-20), pin-compatible with industry-standard 74-series transceivers. The body width is 7.5 mm, lead pitch is 1.27 mm, and it complies with JEDEC MS-013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low Output Enable | Disables both A and B ports simultaneously into high-Z; required for bus arbitration |
| 2 (T/R) | Transmit/Receive Control | HIGH = A→B data flow; LOW = B→A; asynchronous, no clock dependency |
| 3–10 (A0–A7) | Side-A Bidirectional I/O | Connects to local bus; driven or sensed depending on T/R and OE state |
| 11 (GND) | Ground Reference | Primary return path for all I/O and supply currents; must be low-impedance |
| 12–19 (B0–B7) | Side-B Bidirectional I/O | Connects to remote bus; directionally coupled to A-side via T/R logic |
| 20 (VCC) | Power Supply | 5V rail only; decoupling capacitor (0.1 µF) required within 10 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| True TTL Input/Output Compatibility | VOH ≥ 2.4V at -6mA and VOL ≤ 0.55V at +48mA ensure interoperability with legacy 74LS/74ALS systems |
| High-Drive Outputs | 64mA sink capability eliminates need for external bus drivers in multi-drop industrial backplanes |
| Live Insertion Support | Power-off disable behavior prevents bus contention when hot-plugging daughterboards or modules |
| Low Quiescent Current | ICC ≤ 1 mA at VCC = 5V enables use in power-constrained industrial controllers with extended sleep modes |
| MIL-STD-883 Qualified Option | Same die available in CERDIP/LCC for military-aerospace programs requiring Class B screening |
Applications
| Industrial Backplane Interconnect | Legacy System Bus Extension |
|---|---|
Use Scenario: Connecting CPU and peripheral modules across a 16-layer PCB backplane with 15 cm trace lengths and 30 pF net capacitance. IC Role / Device Role / Timing Role: Bidirectional data bridge synchronizing asynchronous address/data transfers between isolated subsystems. Use Value: 4.1 ns max propagation delay and 64mA drive maintain signal integrity without repeaters at 25 MHz bus clock. | Use Scenario: Upgrading a 1980s PLC mainframe by adding modern I/O cards while retaining original 74LS-based motherboard. IC Role / Device Role / Timing Role: Level- and drive-compatible interface translating between LS-TTL logic levels and newer CMOS peripherals. Use Value: VOH/VOL specs match 74LS thresholds exactly, enabling drop-in replacement without redesigning pull-up networks or timing margins. |
| Modular Test Equipment | Factory Automation Controller |
Use Scenario: Reconfigurable instrument chassis where modules are hot-swapped during calibration sequences. IC Role / Device Role / Timing Role: Isolation buffer enabling safe insertion/removal of measurement modules without disrupting master controller bus. Use Value: Power-off disable outputs prevent bus contention and latch-up during live insertion events per MIL-STD-883 requirement. | Use Scenario: Distributed I/O rack communicating with central motion controller over 2 m ribbon cable harnesses. IC Role / Device Role / Timing Role: Robust bus repeater driving long stubs and multiple slave nodes in noisy factory EMI environments. Use Value: -15mA/64mA drive strength sustains valid logic levels across 50 cm daisy-chained cables with 40 pF/m capacitance. |
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 | Faster propagation (2.5 ns typ.), higher ICC (3 mA max), no industrial temp rating - rated only to 70°C | Limited to commercial-grade systems; unsuitable for extended thermal environments | Select when speed is critical and ambient stays below 70°C; verify layout for higher supply noise |
| 74LCX245MTCX | 3.3V-only supply, lower drive (±24mA), 5V-tolerant inputs - not pin-compatible with 74FCT245CTPYG8 | Requires level-shifting for 5V bus integration; incompatible with direct 5V replacement | Choose for mixed-voltage systems where 3.3V core logic interfaces to 5V peripherals via translation |
Compared with SN74F245N and 74LCX245MTCX, the 74FCT245CTPYG8 uniquely balances industrial temperature operation, 5V TTL compatibility, and high sink current - making it the only option among the three qualified for uncontrolled-ambient factory control panels.
Availability
74FCT245CTPYG8 is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy system bus extension, and modular test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74FCT245CTPYG8 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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT applications.
The IDT FCT family - including the 74FCT245CTPYG8 - was developed to replace legacy 74LS logic with CMOS efficiency while preserving pinout, voltage thresholds, and timing behavior for seamless industrial system upgrades.
FAQ
What is the operating voltage range for the 74FCT245CTPYG8?
The 74FCT245CTPYG8 operates strictly at VCC = 5.0V ±5%, with absolute maximum terminal voltage of –0.5V to +7.0V on inputs and –0.5V to VCC+0.5V on outputs. It does not support 3.3V or dual-supply operation. This fixed 5V requirement ensures consistent TTL-compatible output swing and drive strength across its industrial temperature range.
Does the 74FCT245CTPYG8 support live insertion in backplane systems?
Yes, the 74FCT245CTPYG8 supports live insertion due to its power-off disable feature: when VCC is removed, outputs enter high-impedance state automatically, preventing bus contention. This behavior is verified per MIL-STD-883 Class B and is critical for hot-swap capable industrial chassis and modular instrumentation using the 74FCT245CTPYG8.
What is the maximum capacitive load the 74FCT245CTPYG8 can drive reliably?
The 74FCT245CTPYG8 is characterized up to CL = 50 pF in switching tests, with guaranteed tPLH/tPHL performance within 1.5–4.1 ns. Its 64mA IOL allows driving heavier loads - up to ~80 pF with marginal timing margin - but for robust 25 MHz bus operation, design to ≤50 pF per node using the 74FCT245CTPYG8's specified load condition.
Is the 74FCT245CTPYG8 pin-compatible with older 74LS245 devices?
Yes, the 74FCT245CTPYG8 uses identical SOIC-20 pinout and functional mapping as 74LS245, including OE (pin 1), T/R (pin 2), A0–A7 (pins 3–10), GND (pin 11), B0–B7 (pins 12–19), and VCC (pin 20). This mechanical and logical compatibility enables direct replacement in legacy designs without PCB modification.
How does the 74FCT245CTPYG8 handle input hysteresis and noise immunity?
The 74FCT245CTPYG8 provides 200 mV typical input hysteresis (VH), enhancing noise rejection on control lines like OE and T/R in electrically noisy industrial settings. This hysteresis is inherent to its FCT process and does not require external components - a key reliability factor distinguishing the 74FCT245CTPYG8 from non-hysteresis CMOS variants.
74FCT245CTPYG8 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
74FCT245CTPYG8 FAQ
1.How can I place an order for 74FCT245CTPYG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT245CTPYG8 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 74FCT245CTPYG8 reliable?
The price and inventory of 74FCT245CTPYG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT245CTPYG8 is usually 5 days.
3.What payment methods are accepted for 74FCT245CTPYG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT245CTPYG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT245CTPYG8?
74FCT245CTPYG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT245CTPYG8 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 74FCT245CTPYG8?
For technical support, including 74FCT245CTPYG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT245CTPYG8 requirements.
6.How does Aetrix verify that 74FCT245CTPYG8 is sourced from the original manufacturer or authorized distributors?
All 74FCT245CTPYG8 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 74FCT245CTPYG8 meets industry standards.
7.What is the process for return or replacement of 74FCT245CTPYG8?
All 74FCT245CTPYG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT245CTPYG8, 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 74FCT245CTPYG8 part is unused and in its original packaging.
Return procedure for 74FCT245CTPYG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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