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Renesas 74FCT240CTSOG8
- Part No.:
- 74FCT240CTSOG8
- Manufacturer:
- Renesas
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74FCT240CTSOG8.pdf
- Description:
- IC BUFFER INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,135
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Product details
Overview
74FCT240CTSOG8 from Renesas Electronics is a FAST CMOS octal buffer/line driver with 3-state outputs, designed for memory and address bus driving, clock distribution, and bus-oriented transmitter/receiver applications. It features true TTL input/output compatibility (VOH = 3.3 V typ., VOL = 0.3 V typ.), high drive capability (–15 mA IOH, 64 mA IOL), and operates across industrial temperature range (–40°C to +85°C) at 5.0 V ±5%.
For engineers reviewing the 74FCT240CTSOG8 datasheet, 74FCT240CTSOG8 pinout, 74FCT240CTSOG8 application, or 74FCT240CTSOG8 equivalent, key selection criteria include 3-state enable control timing (tPZH ≤ 6.5 ns, tPHZ ≤ 5.7 ns), low input/output leakage (≤1 µA max), CMOS power efficiency, JEDEC 18 compliance, and SOIC-20 Green package suitability for high-density PCB layouts.
Technical Context
The 74FCT240CTSOG8 implements dual-rail CMOS logic with active-low 3-state enable inputs (OEA, OEB) controlling two independent 4-bit groups. Each group provides non-inverting buffered output with TTL-compatible thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and rail-to-rail output swing under load.
Its propagation delay (tPLH/tPHL ≤ 4.8 ns at CL = 50 pF, RL = 500 Ω) and fast enable/disable times (tPZH ≤ 6.5 ns, tPHZ ≤ 5.7 ns) support high-speed bus interfacing in synchronous systems. The device meets MIL-STD-883 Class B for reliability-critical industrial use and supports live insertion via power-off disable outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | 5.0 V ±5% - fixed single-rail operation compatible with legacy 5 V TTL/CMOS systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade environmental robustness |
| Output Drive | –15 mA IOH / 64 mA IOL - sufficient to drive multiple TTL loads or terminate transmission lines |
| Propagation Delay | ≤4.8 ns (tPLH/tPHL) - enables reliable operation up to ~200 MHz bus toggle rates |
| Input Leakage | ≤1 µA max - minimizes static current draw and prevents unintended logic transitions |
| 3-State Enable Timing | tPZH ≤ 6.5 ns, tPHZ ≤ 5.7 ns - ensures clean bus arbitration without contention windows |
| Input Compatibility | TTL-level VIH = 2.0 V min, VIL = 0.8 V max - interoperable with standard 5 V logic families |
Pinout & Package
74FCT240CTSOG8 is housed in a 20-pin Small Outline IC (SOIC) package with green (RoHS-compliant) finish, designated SOG in Renesas ordering nomenclature. Pin pitch is 0.050", body width 7.5 mm, and footprint compatible with JEDEC MS-013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA, OEB | Active-low 3-state enable inputs - independently control output groups OA0–OA3 and OB0–OB3 |
| 2–5, 13–16 | Dxx, Oxx | Data inputs (DA0–DA3, DB0–DB3) and buffered non-inverting outputs (OA0–OA3, OB0–OB3) |
| 10, 20 | GND, VCC | Power reference and supply - decoupling required within 1 cm of pins for noise immunity |
| 6–9, 11–14 | OA0–OA3, OB0–OB3 | Outputs - high-drive, 3-state capable; float to high-impedance when OEA/OEB = HIGH |
Key Features
| Feature | Design Value |
|---|---|
| True TTL Input/Output Compatibility | VOH = 3.3 V typ. and VOL = 0.3 V typ. at 5 V supply - eliminates level-shifting in mixed-logic systems |
| High-Drive Outputs | 64 mA sink per output - drives 10+ standard TTL loads or 50 Ω transmission lines directly |
| Live Insertion Support | Power-off disable outputs - prevents bus contention during hot-swap or board replacement |
| JEDEC 18 Compliance | Fully conforms to industry-standard timing, voltage, and interface requirements for 5 V logic devices |
| Low Quiescent Current | ICC ≤ 1 mA max - reduces system standby power in always-on industrial controllers |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
Use Scenario: Driving 16-bit address bus between microcontroller and SRAM/Flash in an industrial PLC controller. IC Role / Device Role / Timing Role: Non-inverting octal buffer with 3-state control isolates CPU from memory during DMA cycles. Use Value: High drive strength (64 mA IOL) ensures clean signal integrity across 10 cm PCB traces; tPLH ≤ 4.8 ns maintains setup/hold timing margins at 25 MHz bus speed. | Use Scenario: Distributing a 10 MHz system clock to multiple peripheral ICs on a factory automation I/O module. IC Role / Device Role / Timing Role: Low-skew, fan-out buffer with matched propagation delays across all eight outputs. Use Value: Propagation delay matching (ΔtPLH < 0.5 ns) minimizes clock skew; TTL-compatible VOH/VOL ensures reliable triggering of downstream logic. |
| Bus Transceiver Interface | Legacy Peripheral Interfacing |
Use Scenario: Bidirectional data bus isolation between FPGA and legacy ISA-style expansion slot in test equipment. IC Role / Device Role / Timing Role: Dual-group 3-state buffer enabling direction-controlled data flow without external transceivers. Use Value: Independent OEA/OEB control allows precise timing of bus turnarounds; tPHZ ≤ 5.7 ns prevents data collision during direction switching. | Use Scenario: Interfacing modern microcontroller GPIOs to legacy 5 V parallel port peripherals (e.g., printers, scanners) in medical diagnostic hardware. IC Role / Device Role / Timing Role: Level-tolerant buffer translating 3.3 V MCU outputs to full 5 V TTL swing while accepting 5 V inputs safely. Use Value: VIH = 2.0 V min and VIL = 0.8 V max guarantee detection of 3.3 V logic highs; 5 V tolerant inputs eliminate need for external clamping diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F240N | Lower drive (–15 mA IOH / 64 mA IOL same), but higher ICC (max 25 mA vs. 1 mA for 74FCT240CTSOG8); no live-insertion support | Not qualified for industrial temp range; limited to 0°C to +70°C commercial use | Select when cost is primary constraint and extended temperature or low-power operation is not required |
| 74ACT240SCX | Higher speed (tPLH ≤ 3.5 ns), but higher input capacitance (CIN = 12 pF vs. 10 pF); identical 5 V supply and SOIC-20 package | Better suited for >33 MHz clock distribution; less tolerant of long trace lengths due to higher CIN | Select when sub-4 ns propagation delay is critical and layout allows tighter impedance control |
Compared with SN74F240N and 74ACT240SCX, the 74FCT240CTSOG8 delivers optimal balance of industrial temperature rating, ultra-low quiescent current, live-insertion capability, and JEDEC 18 compliance-making it preferred for ruggedized embedded control and long-lifecycle industrial designs where reliability and power efficiency are prioritized over marginal speed gains.
Availability
74FCT240CTSOG8 is available at Aetrix Electronics and suitable for industrial PLCs, factory automation I/O modules, medical diagnostic interfaces, and legacy bus expansion systems requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle assurance.
Supply support for 74FCT240CTSOG8 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, infrastructure, and IoT applications.
The IDT FCT family-including 74FCT240CTSOG8-was developed to replace legacy TTL buffers with pin-compatible, low-power CMOS alternatives offering improved noise immunity, higher drive, and industrial/military qualification.
FAQ
What is the operating voltage range for the 74FCT240CTSOG8?
The 74FCT240CTSOG8 operates at a nominal supply voltage of 5.0 V with a tolerance of ±5%, specified for industrial temperature range (–40°C to +85°C). It is not rated for operation below 4.75 V or above 5.25 V under normal conditions, and its DC electrical characteristics-including VOH, VOL, and propagation delay-are guaranteed only within this window. Operation outside this range may result in undefined logic states or increased ICC.
Does the 74FCT240CTSOG8 support live insertion, and how is this implemented?
Yes, the 74FCT240CTSOG8 supports live insertion through its power-off disable feature: when VCC is removed or dropped below functional threshold, outputs enter high-impedance state regardless of OEA/OEB logic levels. This prevents bus contention during hot-swap events in backplane or modular industrial systems. The behavior is inherent to the internal circuit design and requires no external circuitry-verified per datasheet Section "Power off disable outputs permit 'live insertion'".
What are the absolute maximum ratings for input voltage on the 74FCT240CTSOG8?
The 74FCT240CTSOG8 specifies two absolute maximum input voltage limits: –0.5 V to +7.0 V for inputs and VCC terminals (VTERM(2)), and –0.5 V to VCC + 0.5 V for output and I/O terminals (VTERM(3)). Exceeding these values-even momentarily-may cause permanent damage. These ratings are defined in the Absolute Maximum Ratings table (page 2 of datasheet DSC-5584/8) and apply across the full industrial temperature range.
How many independent 3-state control inputs does the 74FCT240CTSOG8 have, and what do they control?
The 74FCT240CTSOG8 has two independent active-low 3-state enable inputs: OEA controls outputs OA0–OA3, and OEB controls outputs OB0–OB3. This dual-enable architecture allows selective gating of two 4-bit data paths-for example, isolating upper and lower bytes of a 16-bit bus. Both enables must be LOW for their respective outputs to drive; either HIGH forces the corresponding group into high-impedance state.
Is the 74FCT240CTSOG8 RoHS-compliant, and what does the 'G' suffix indicate in its part number?
Yes, the 74FCT240CTSOG8 is RoHS-compliant. The 'G' in SOG denotes "Green", Renesas' designation for lead-free, halogen-free, and RoHS-compliant packaging. This is confirmed in the Ordering Information section (page 6), where SOG is explicitly defined as "Small Outline IC – Green". The device meets EU RoHS Directive 2011/65/EU and related substance restrictions without exemptions.
74FCT240CTSOG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- 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-SOIC
74FCT240CTSOG8 FAQ
1.How can I place an order for 74FCT240CTSOG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT240CTSOG8 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 74FCT240CTSOG8 reliable?
The price and inventory of 74FCT240CTSOG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT240CTSOG8 is usually 5 days.
3.What payment methods are accepted for 74FCT240CTSOG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT240CTSOG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT240CTSOG8?
74FCT240CTSOG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT240CTSOG8 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 74FCT240CTSOG8?
For technical support, including 74FCT240CTSOG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT240CTSOG8 requirements.
6.How does Aetrix verify that 74FCT240CTSOG8 is sourced from the original manufacturer or authorized distributors?
All 74FCT240CTSOG8 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 74FCT240CTSOG8 meets industry standards.
7.What is the process for return or replacement of 74FCT240CTSOG8?
All 74FCT240CTSOG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT240CTSOG8, 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 74FCT240CTSOG8 part is unused and in its original packaging.
Return procedure for 74FCT240CTSOG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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