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Texas Instruments SN74ACT240DWRE4
- Part No.:
- SN74ACT240DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT240DWRE4.pdf
- Description:
- IC BUFF INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,352
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Product details
Overview
SN74ACT240DWRE4 from Texas Instruments is an octal 3-state inverting buffer/driver IC designed for bus-oriented applications including memory address driving, clock distribution, and data transmission. It operates at 4.5V–5.5V VCC, delivers ≤8.5ns propagation delay at 5V, supports TTL-compatible inputs up to 5.5V, and features dual independent output-enable controls for flexible bus management in industrial and communications systems.
For engineers reviewing the SN74ACT240DWRE4 datasheet, SN74ACT240DWRE4 pinout, SN74ACT240DWRE4 application, or SN74ACT240DWRE4 equivalent, key selection criteria include its 20-pin SOIC (DW) package, dual 4-bit inverted buffer architecture with separate OE pins, guaranteed 24mA drive strength per output, and operation across –40°C to +85°C ambient temperature.
Technical Context
The SN74ACT240DWRE4 implements two independent 4-bit inverting buffer sections, each with dedicated output-enable (OE) control-1OE for Y1–Y4 outputs and 2OE for Y1'–Y4' (labeled as 1Y1–1Y4 and 2Y1–2Y4 in pinout). Each section inverts input signals (A→Y), enabling bidirectional bus isolation when combined with complementary drivers.
Its balanced CMOS push-pull outputs provide symmetrical sourcing and sinking capability (±24mA at VCC = 5V), supporting fast edge rates into light loads while requiring careful PCB routing to suppress ringing. The device maintains high-impedance outputs when either OE is high, allowing safe bus sharing without contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures compatibility with standard 5V logic rails and tolerates supply variation without functional degradation. |
| Max Propagation Delay | 8.5ns at 5V - Enables reliable operation in high-speed digital interfaces up to ~115MHz clock domains (tpd < 8.5ns). |
| Output Drive Strength | ±24mA per output - Sustains robust signal integrity across typical PCB trace loads and multiple TTL/CMOS inputs. |
| Input Voltage Tolerance | Up to 5.5V - Allows interfacing with overvoltage-tolerant peripherals or mixed-voltage subsystems without level-shifting. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded systems including network switches and wearables. |
| Logic Function | Inverting 3-state buffer (A→Y, OE active-low) - Provides controlled signal inversion and bus release via independent enable controls. |
Pinout & Package
SN74ACT240DWRE4 uses a 20-pin SOIC (DW) package measuring 12.8mm × 10.3mm (body: 12.80mm × 7.50mm), RoHS-compliant with NIPDAU lead finish and moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Active-low output enable 1 | Controls Y1–Y4 (pins 18,16,14,12); low = enabled/inverted pass-through, high = high-Z. |
| 2OE | Active-low output enable 2 | Controls Y1'–Y4' (pins 3,5,7,9); independent of 1OE for dual-bus arbitration. |
| 1A1–1A4 | Input group 1 | Pins 2,4,6,8 - Inverted to corresponding Y outputs (1Y1–1Y4) when 1OE is low. |
| 2A1–2A4 | Input group 2 | Pins 11,13,15,17 - Inverted to corresponding Y outputs (2Y1–2Y4) when 2OE is low. |
| 1Y1–1Y4 | Output group 1 | Pins 18,16,14,12 - Inverted copies of 1A1–1A4, enabled by 1OE. |
| 2Y1–2Y4 | Output group 2 | Pins 3,5,7,9 - Inverted copies of 2A1–2A4, enabled by 2OE. |
| VCC (Pin 20) | Power supply | 5V nominal supply; must be decoupled locally to maintain switching noise immunity. |
| GND (Pin 10) | Ground reference | Common return path for all I/O and internal circuitry; requires low-inductance connection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit buffers | Enables simultaneous control of two 4-bit buses (e.g., address/data separation) using separate OE pins. |
| TTL-compatible inputs | Accepts standard TTL voltage thresholds (VIL ≤ 0.8V, VIH ≥ 2V) while operating on 5V CMOS supply. |
| High-speed performance | 8.5ns max tPLH/tPHL at 5V ensures timing margin in 20+ MHz synchronous bus designs. |
| Robust output drive | ±24mA per output supports fan-out to ≥10 standard TTL loads or direct connection to unterminated traces. |
| Wide operating temperature | –40°C to +85°C range meets industrial environmental requirements without derating. |
Applications
| Memory Address Buffering | Industrial Network Switch Interface |
|---|---|
Use Scenario: Driving multiplexed address lines between microcontroller and SRAM/Flash in space-constrained industrial controllers. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating CPU address bus from memory during DMA cycles; OE synchronized to memory enable. Use Value: Prevents bus contention during memory access arbitration while maintaining sub-10ns address setup/hold timing. | Use Scenario: Level-shifting and buffering control signals (e.g., MDIO, reset, LED indicators) between switch ASIC and external PHY modules. IC Role / Device Role / Timing Role: Bidirectional signal conditioner translating between 3.3V ASIC I/O and 5V legacy PHY logic levels. Use Value: Eliminates need for discrete level shifters; ±24mA drive ensures reliable signaling across noisy backplane environments. |
| Wearable Health Sensor Hub | Smartphone Peripheral Expansion |
Use Scenario: Managing shared I²C/SPI bus among multiple biometric sensors (ECG, SpO₂, accelerometer) in compact wearable form factors. IC Role / Device Role / Timing Role: Bus isolator enabling dynamic sensor activation/deactivation without disrupting ongoing communication on main controller bus. Use Value: Reduces system power by disabling unused sensor paths; 8.5ns delay preserves real-time sampling synchronization. | Use Scenario: Expanding GPIO count for camera module control, flash LED sequencing, and auxiliary button inputs in smartphone baseband subsystems. IC Role / Device Role / Timing Role: General-purpose logic buffer providing additional drive strength and noise immunity for low-voltage peripheral control lines. Use Value: Compensates for capacitive loading from flex-cable interconnects; TTL-compatible inputs simplify integration with existing baseband logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT240DWR | Same die, identical electrical specs, SOIC-20 package, but non-E4 suffix (standard RoHS, no green marking). | No functional difference; E4 denotes TI's enhanced flow (green mold compound, tighter parametric screening). | Select SN74ACT240DWRE4 for extended reliability validation in long-lifecycle industrial deployments. |
| 74ACT240SCX | Functionally identical logic, but manufactured by ON Semiconductor; 20-pin SOIC, ±24mA drive, 8.5ns tpd. | Same pinout and DC specs; minor variations in AC characteristics (e.g., tPZH = 9.5ns vs. 10ns) within datasheet limits. | Choose 74ACT240SCX for multi-source procurement strategy where second-source qualification is required. |
Compared with SN74ACT240DWR, SN74ACT240DWRE4 offers enhanced process consistency and environmental compliance, while 74ACT240SCX provides a validated alternate source with identical system-level integration behavior in bus buffering applications.
Availability
SN74ACT240DWRE4 is available at Aetrix Electronics and suitable for industrial network switches, wearable health sensor hubs, and smartphone peripheral expansion requiring stable component supply and long-term production continuity.
Supply support for SN74ACT240DWRE4 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 90 years of innovation in high-reliability components.
The SNx4ACT240 family was engineered to deliver high-speed, low-power 3-state buffering for memory, clock, and bus interface applications in industrial, communications, and portable electronics.
FAQ
What is the function of the 1OE and 2OE pins on the SN74ACT240DWRE4?
The SN74ACT240DWRE4 has two independent output-enable inputs: 1OE (pin 1) controls the first four outputs (1Y1–1Y4), and 2OE (pin 19) controls the second four outputs (2Y1–2Y4). Both are active-low - when low, the respective outputs invert and drive their A-input signals; when high, those outputs enter high-impedance state. This enables selective bus isolation without affecting other channels.
Does the SN74ACT240DWRE4 support 3.3V logic inputs?
Yes, the SN74ACT240DWRE4 accepts TTL-compatible inputs up to 5.5V, meaning it reliably interprets 3.3V logic-high signals as valid high-level inputs (VIH = 2.0V min). However, it requires a 4.5V–5.5V VCC supply and does not operate natively at 3.3V - level translation is needed for full 3.3V system integration.
What is the maximum output current rating per pin for SN74ACT240DWRE4?
The SN74ACT240DWRE4 is rated for ±24mA DC output current per pin under recommended operating conditions (VCC = 4.5V–5.5V, TA = –40°C to +85°C). Absolute maximum ratings allow ±50mA short-duration pulses, but sustained operation above ±24mA risks thermal overstress and is not guaranteed per datasheet specifications.
Can SN74ACT240DWRE4 be used in place of SN74LS240?
While both are octal 3-state inverting buffers, SN74ACT240DWRE4 is not a direct drop-in replacement for SN74LS240 due to differences in supply voltage (5V only vs. 4.5–5.5V), output drive (±24mA vs. ±15mA), and speed (8.5ns vs. 25ns). Interchange requires verification of timing margins, load capacitance, and power rail compatibility in the target design.
What package type and dimensions does SN74ACT240DWRE4 use?
SN74ACT240DWRE4 uses a 20-pin SOIC (DW) package with body dimensions of 12.80mm × 7.50mm and overall footprint of 12.8mm × 10.3mm. It features gull-wing leads, RoHS-compliant NIPDAU plating, and moisture sensitivity level 1 (MSL-1), suitable for standard surface-mount assembly processes.
SN74ACT240DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ACT240DWRE4 FAQ
1.How can I place an order for SN74ACT240DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT240DWRE4 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 SN74ACT240DWRE4 reliable?
The price and inventory of SN74ACT240DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT240DWRE4 is usually 5 days.
3.What payment methods are accepted for SN74ACT240DWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT240DWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT240DWRE4?
SN74ACT240DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT240DWRE4 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 SN74ACT240DWRE4?
For technical support, including SN74ACT240DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT240DWRE4 requirements.
6.How does Aetrix verify that SN74ACT240DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT240DWRE4 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 SN74ACT240DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT240DWRE4?
All SN74ACT240DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT240DWRE4, 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 SN74ACT240DWRE4 part is unused and in its original packaging.
Return procedure for SN74ACT240DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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