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Renesas 74FCT3245AQG8
- Part No.:
- 74FCT3245AQG8
- Manufacturer:
- Renesas
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74FCT3245AQG8.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,471
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Product details
Overview
74FCT3245AQG8 from Renesas Electronics (formerly IDT) is a 3.3V CMOS octal bidirectional transceiver with industrial temperature range (–40°C to +85°C), 7 ns max propagation delay, ±60 mA output drive, and QSOP-20 green package. It enables asynchronous bus communication between two 8-bit data paths using DIR and OE control pins.
For engineers reviewing the 74FCT3245AQG8 datasheet, 74FCT3245AQG8 pinout, 74FCT3245AQG8 application, or 74FCT3245AQG8 equivalent, key selection criteria include bidirectional data flow control, rail-to-rail output swing for noise margin, 3.3V supply tolerance (2.7V–3.6V), low static power (0.4 μW typ.), and industrial-grade reliability.
Technical Context
The 74FCT3245AQG8 implements dual-bus isolation via active-low OE and unidirectional DIR control, supporting A→B or B→A data transfer while disabling both ports in high-impedance state. Its hysteresis-equipped inputs improve noise immunity, and integrated series current-limiting resistors reduce ground bounce and undershoot.
Designed for 3.3V systems with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), it delivers VOH ≥ 2.4 V at –8 mA and VOL ≤ 0.4 V at 24 mA, meeting industrial bus interface requirements without external termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports wide 3.3V system tolerance including brown-out conditions |
| Propagation Delay | 7 ns max (tPLH/tPHL) - ensures sub-140 MHz bus timing margin for synchronous interfaces |
| Output Drive | ±60 mA - drives standard TTL loads and short stubs without external buffers |
| Input Hysteresis | 150 mV - rejects noise on control lines (DIR/OE) in electrically noisy environments |
| Static ICC | 0.4 μW typical - enables ultra-low-power standby in battery-backed or energy-sensitive systems |
| Operating Temp | –40°C to +85°C - qualified for industrial automation, motor control, and outdoor embedded applications |
| ESD Rating | >2000 V HBM - withstands handling and board-level ESD events per MIL-STD-883 |
Pinout & Package
74FCT3245AQG8 is housed in a 20-pin Quarter-size Small Outline Package (QSOP-20), RoHS-compliant and green (lead-free). Dimensions: 7.2 mm × 5.3 mm × 1.75 mm, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low Output Enable | Disables both A and B ports to high-impedance when HIGH; overrides DIR |
| 2 (DIR) | Direction Control | LOW = B→A data flow; HIGH = A→B data flow; only active when OE = LOW |
| 3–10 (A1–A8) | Side-A I/O Terminals | Bidirectional pins tied to Bus A; driven by B-side when DIR = LOW and OE = LOW |
| 11 (GND) | Ground Reference | Primary return path for all digital logic and output currents |
| 12–19 (B1–B8) | Side-B I/O Terminals | Bidirectional pins tied to Bus B; driven by A-side when DIR = HIGH and OE = LOW |
| 20 (VCC) | Power Supply | 3.3V supply input with decoupling capacitor recommended near pin |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | VOH ≥ VCC–0.2 V and VOL ≤ 0.4 V - maximizes noise margin in mixed-voltage or long-trace bus designs |
| Integrated current-limiting resistors | Reduces ground bounce and output overshoot - eliminates need for discrete series termination on PCB |
| Hysteresis on all inputs | 150 mV threshold window - prevents chatter on DIR/OE during slow-rising control signals |
| Low dynamic power consumption | ICCD = 60 μA/MHz - minimizes switching-related supply current in high-frequency data transfers |
| Industrial temperature qualification | Tested across –40°C to +85°C - ensures reliable operation in factory-floor PLCs and outdoor telecom equipment |
Applications
| Industrial PLC Backplane Interface | Legacy ISA Bus Extension |
|---|---|
Use Scenario: Interfacing a modern 3.3V microcontroller unit to an older 5V ISA bus segment in retrofit industrial controllers. IC Role / Device Role / Timing Role: Level-shifting bidirectional transceiver isolating voltage domains while preserving signal integrity and timing alignment. Use Value: Enables direct connection without external level shifters; 7 ns delay preserves ISA timing budgets under worst-case VCC and temperature. | Use Scenario: Adding isolated memory-mapped I/O expansion to a legacy PC/104 stack operating at 3.3V. IC Role / Device Role / Timing Role: Octal bidirectional data path controller managing read/write handshaking between host and peripheral modules. Use Value: OE and DIR pins allow precise cycle-by-cycle direction control; hysteresis prevents metastability during bus arbitration transitions. |
| Motor Drive Controller Data Hub | Automated Test Equipment (ATE) Signal Matrix |
Use Scenario: Aggregating sensor feedback and command signals across multiple isolated motor driver boards in a servo cabinet. IC Role / Device Role / Timing Role: Bidirectional bus repeater buffering and isolating differential encoder and PWM signals between subsystems. Use Value: ±60 mA drive strength sustains signal integrity over 15 cm ribbon cables; industrial temp rating matches drive enclosure ambient. | Use Scenario: Configurable signal routing matrix in modular ATE platforms requiring fast reconfiguration of DUT I/O paths. IC Role / Device Role / Timing Role: Reconfigurable 8-bit data switch enabling dynamic test pattern injection and response capture across multiple DUT pins. Use Value: Sub-10 ns enable/disable times support <100 ns test vector switching; low ICCZ enables dense channel packing without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower drive (±24 mA), wider VCC range (1.65–3.6 V), no hysteresis on controls | Suitable for portable low-voltage systems but lacks noise immunity for industrial control lines | Select when cost and 1.8V compatibility outweigh industrial noise robustness needs |
| 74ALVC245MTCX | Same 3.3V operation, ±24 mA drive, no integrated current limiting, higher ICC | Used in commercial-grade instrumentation where ground bounce is less critical | Prefer when footprint compatibility matters more than EMI suppression or drive strength |
Compared with SN74LVC245APWR and 74ALVC245MTCX, the 74FCT3245AQG8 provides superior noise immunity (hysteresis), stronger drive (±60 mA), and built-in current limiting-making it optimal for electrically harsh industrial backplanes where signal integrity and reliability are non-negotiable.
Availability
74FCT3245AQG8 is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, motor drive controller data hubs, and automated test equipment signal matrices requiring stable component supply across extended temperature and voltage ranges.
Supply support for 74FCT3245AQG8 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 connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The 74FCT3245AQG8 belongs to Renesas' legacy IDT logic portfolio, engineered specifically for robust, low-latency bidirectional bus interfacing in industrial control and automation systems requiring guaranteed performance across full temperature and supply ranges.
FAQ
What is the maximum clock/data rate supported by the 74FCT3245AQG8?
The 74FCT3245AQG8 does not operate synchronously and has no internal clock. Its 7 ns maximum propagation delay supports data rates up to ~140 MHz in point-to-point or short-bus configurations, assuming clean signal edges and proper termination. Real-world throughput depends on system-level timing margins, bus loading, and control signal setup/hold times-not a fixed clock frequency.
Does the 74FCT3245AQG8 support mixed-voltage operation between 3.3V and 5V buses?
The 74FCT3245AQG8 operates exclusively at 3.3V (2.7–3.6V) and is not 5V-tolerant on inputs or outputs. Direct connection to 5V buses risks damage. For 3.3V↔5V translation, external level-shifting circuitry or a dedicated voltage-tolerant transceiver such as the TXB0108 must be used alongside the 74FCT3245AQG8.
Can the 74FCT3245AQG8 be used with OE and DIR tied permanently to logic levels?
Yes - OE and DIR can be hardwired to GND (for always-enabled, A→B direction) or VCC (for always-high-Z or fixed B→A direction), provided pull-up/pull-down resistors meet VIH/VIL thresholds. However, doing so forfeits dynamic direction control and disables the high-impedance isolation feature, reducing flexibility in multi-master or shared-bus architectures.
What is the purpose of the hysteresis on the DIR and OE inputs of the 74FCT3245AQG8?
The 150 mV input hysteresis on DIR and OE prevents metastability and false triggering caused by slow-rising or noisy control signals-common in industrial environments with long traces, relay-driven logic, or shared ground returns. This ensures clean, glitch-free bus direction and enable transitions even with marginal slew rates, improving system-level reliability without external Schmitt triggers.
Is the 74FCT3245AQG8 pin-compatible with earlier 74FCT245 variants?
No - the 74FCT3245AQG8 uses a 20-pin QSOP package with specific pinout (e.g., GND at pin 11, VCC at pin 20), whereas legacy 74FCT245 variants commonly use 20-pin SOIC or 24-pin packages with different pin assignments. Always verify pin mapping against the official 74FCT3245AQG8 datasheet before PCB layout or replacement.
74FCT3245AQG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm 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:
- 8mA, 24mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QSOP
74FCT3245AQG8 FAQ
1.How can I place an order for 74FCT3245AQG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT3245AQG8 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 74FCT3245AQG8 reliable?
The price and inventory of 74FCT3245AQG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT3245AQG8 is usually 5 days.
3.What payment methods are accepted for 74FCT3245AQG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT3245AQG8 transactions.
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4.How is shipping managed for 74FCT3245AQG8?
74FCT3245AQG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT3245AQG8 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 74FCT3245AQG8?
For technical support, including 74FCT3245AQG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT3245AQG8 requirements.
6.How does Aetrix verify that 74FCT3245AQG8 is sourced from the original manufacturer or authorized distributors?
All 74FCT3245AQG8 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 74FCT3245AQG8 meets industry standards.
7.What is the process for return or replacement of 74FCT3245AQG8?
All 74FCT3245AQG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT3245AQG8, 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 74FCT3245AQG8 part is unused and in its original packaging.
Return procedure for 74FCT3245AQG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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