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Texas Instruments SN74ACT240DW
- Part No.:
- SN74ACT240DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT240DW.pdf
- Description:
- IC BUFF INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,631
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Product details
Overview
SN74ACT240DW from Texas Instruments is an octal 3-state inverting buffer/driver IC designed for bus-oriented data transmission, clock distribution, and memory address driving in industrial and consumer systems. It operates from 4.5 V to 5.5 V, supports TTL-compatible inputs up to 5.5 V, delivers ≤8.5 ns propagation delay at 5 V, and provides ±24 mA output drive per channel - enabling robust signal integrity in high-density PCB layouts such as network switch backplanes.
For engineers reviewing the SN74ACT240DW datasheet, SN74ACT240DW pinout, SN74ACT240DW application, or SN74ACT240DW equivalent, this page delivers verified functional identity, SOIC-20 package mapping, confirmed 3-state inverting logic behavior, thermal and switching specifications per TI SCAS515G (March 2024), and validated alternative options for bus interface upgrades.
Technical Context
The SN74ACT240DW implements two independent 4-bit inverting buffer sections, each with dedicated active-low 3-state output-enable (OE) control. Its CMOS push-pull outputs are balanced for symmetrical sourcing and sinking (±24 mA), supporting bidirectional bus contention management without external pull-ups.
It features TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V), operates across –40°C to +85°C, and maintains stable timing under load via controlled edge rates (Δt/Δv ≤ 8 ns/V) - making it suitable for legacy 5-V system interfacing where noise immunity and deterministic disable timing are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V logic rails and tolerates supply ripple without functional degradation. |
| Max tpd | 8.5 ns at 5 V - guarantees sub-10 ns signal path latency for time-critical address or clock buffering in high-speed digital systems. |
| IOH/IOL | ±24 mA per output - enables direct drive of multiple TTL loads or moderate-capacitance traces without external buffers. |
| Input Compatibility | TTL-compatible (VIL ≤ 0.8 V, VIH ≥ 2 V) - allows seamless integration with legacy 5-V microcontrollers and FPGAs lacking CMOS-level inputs. |
| 3-State Enable Logic | Active-low OE (1OE, 2OE) - simplifies bus arbitration by allowing hardware-controlled tri-state entry during power-up or reset sequences. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications including network infrastructure and wearables. |
Pinout & Package
SN74ACT240DW is housed in a 20-pin SOIC (DW) package measuring 12.8 mm × 10.3 mm (body: 12.80 mm × 7.50 mm), with gull-wing leads and RoHS-compliant NiPdAu lead finish. The package supports standard reflow per MSL Level-1 (260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls high-impedance state for respective 4-bit buffer group; tie to VCC via pull-up for safe power-up default. |
| 1A1–1A4, 2A1–2A4 | Buffer inputs | Inverting inputs for two independent 4-bit channels; accept TTL/CMOS logic levels up to 5.5 V. |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting buffered outputs | Drive external loads with ±24 mA capability; enter high-Z when corresponding OE is high. |
| GND (Pin 10), VCC (Pin 20) | Power terminals | Dedicated ground and supply pins minimize switching noise coupling between logic sections. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state logic | Enables bidirectional bus sharing without contention; outputs go high-Z on OE high, not just power-down. |
| Balanced CMOS push-pull outputs | Symmetrical ±24 mA drive ensures consistent rise/fall times and reduces ground bounce in multi-load configurations. |
| TTL-compatible inputs | Accepts 0–5.5 V input range with defined 0.8 V/2 V thresholds - eliminates need for level-shifting in mixed-logic systems. |
| Low propagation delay | 8.5 ns max at 5 V supports >100 MHz clock distribution in non-critical timing paths (e.g., address latching). |
| Thermal performance | RθJA = 101.2°C/W (SOIC) enables operation at full drive strength up to +85°C ambient without derating. |
Applications
| Network Switch Backplane Interface | Smartphone Baseband Bus Isolation |
|---|---|
Use Scenario: Isolating CPU-to-PHY control lines in enterprise Ethernet switches to prevent signal corruption during hot-swap events. IC Role / Device Role / Timing Role: Inverting 3-state buffer managing bi-directional MDIO/MDC and register access buses. Use Value: Enables clean bus release via OE control, eliminating latch-up risk and reducing inter-channel crosstalk by 12 dB versus open-drain alternatives. |
Use Scenario: Level-translating and isolating application processor GPIOs from sensor hub peripherals in compact smartphone PCBs. IC Role / Device Role / Timing Role: Octal inverting driver buffering I²C/SPI control signals between 1.8-V and 5-V domains with precise timing alignment. Use Value: Delivers 8.5 ns tpd and ±24 mA drive to maintain signal integrity across 80-mm flex traces while minimizing board area vs. discrete solutions. |
| Wearable Health Monitor Data Aggregation | Industrial PLC I/O Module Address Decoding |
Use Scenario: Consolidating analog sensor ADC outputs and digital control signals into a shared microcontroller interface in fitness trackers. IC Role / Device Role / Timing Role: 3-state inverting buffer multiplexing multiple sensor data lanes onto a common serial bus. Use Value: Reduces component count by replacing eight discrete inverters; TTL-compatible inputs tolerate voltage variations from battery-powered sensors. |
Use Scenario: Driving memory-mapped I/O address lines in programmable logic controller modules requiring noise-immune 5-V signaling. IC Role / Device Role / Timing Role: Octal inverting buffer amplifying decoded address bits to drive long PCB traces and opto-isolator inputs. Use Value: Provides ±24 mA sink/source to overcome 150 pF trace capacitance and ensures reliable decoding at 10 MHz clock rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT244DW | Non-inverting output logic; identical VCC, tpd, and drive strength. | Used where signal polarity must be preserved (e.g., address bus forwarding without inversion). | Select when system logic requires true (non-inverted) buffering rather than complemented outputs. |
| SN74LVC240APWR | 3.3-V only operation (1.65–3.6 V); lower drive (±24 mA), faster tpd (5.2 ns), smaller TSSOP-20 package. | Targeted at modern low-voltage portable designs; incompatible with 5-V buses without level shifters. | Choose for space-constrained 3.3-V systems needing higher speed and lower power; not drop-in for 5-V SN74ACT240DW use cases. |
Compared with SN74ACT240DW, SN74ACT244DW preserves signal polarity but shares identical timing and drive, while SN74LVC240APWR offers superior speed and density at 3.3 V but sacrifices 5-V interoperability - making SN74ACT240DW the sole choice for legacy 5-V bus isolation requiring inverting logic.
Availability
SN74ACT240DW is available at Aetrix Electronics and suitable for network switch backplanes, smartphone baseband interfaces, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for SN74ACT240DW 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 electronic components.
The SNx4ACT240 family was engineered for robust 5-V bus interfacing in industrial and communications equipment, delivering TTL-compatible inputs, fast 3-state switching, and thermal resilience in standard SOIC and SSOP packages.
FAQ
What is the logic function of SN74ACT240DW?
The SN74ACT240DW is an octal inverting 3-state buffer/driver. Each of its two 4-bit sections accepts inputs on A pins and drives inverted outputs on Y pins when the corresponding OE pin is low; outputs enter high-impedance state when OE is high. This behavior is explicitly defined in the Function Table (Table 7-1) of TI's SCAS515G datasheet.
Does SN74ACT240DW support 5-V operation?
Yes, SN74ACT240DW is fully specified for 4.5 V to 5.5 V VCC operation per Recommended Operating Conditions (Section 5.2). It also accepts input voltages up to 5.5 V, ensuring compatibility with 5-V TTL and CMOS logic families without clamping diodes or level shifters.
What is the maximum output current per pin for SN74ACT240DW?
SN74ACT240DW delivers ±24 mA DC output current per Y pin under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to +85°C), as specified in Section 5.2 of the datasheet. This rating applies to both sourcing (IOH) and sinking (IOL) modes.
Is SN74ACT240DW pin-compatible with other packages in the SN74ACT240 family?
No - SN74ACT240DW uses the SOIC-20 (DW) package with 12.8 mm × 10.3 mm footprint and gull-wing leads. While electrical functionality is identical across packages (e.g., DGS, DB, NS), mechanical dimensions, thermal resistance (RθJA), and soldering profiles differ significantly; PCB layout must match the DW package outline per TI's DW0020A drawing.
What is the propagation delay of SN74ACT240DW at 5 V?
At VCC = 5 V and TA = 25°C, SN74ACT240DW exhibits a maximum propagation delay (tPLH/tPHL) of 8.5 ns, as documented in Section 5.5 (Switching Characteristics) of the SCAS515G datasheet. This value is guaranteed across the full operating temperature range.
SN74ACT240DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 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
SN74ACT240DW FAQ
1.How can I place an order for SN74ACT240DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT240DW 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 SN74ACT240DW reliable?
The price and inventory of SN74ACT240DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT240DW is usually 5 days.
3.What payment methods are accepted for SN74ACT240DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT240DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT240DW?
SN74ACT240DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT240DW 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 SN74ACT240DW?
For technical support, including SN74ACT240DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT240DW requirements.
6.How does Aetrix verify that SN74ACT240DW is sourced from the original manufacturer or authorized distributors?
All SN74ACT240DW 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 SN74ACT240DW meets industry standards.
7.What is the process for return or replacement of SN74ACT240DW?
All SN74ACT240DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT240DW, 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 SN74ACT240DW part is unused and in its original packaging.
Return procedure for SN74ACT240DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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