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onsemi MC74ACT240DWR2G
- Part No.:
- MC74ACT240DWR2G
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74ACT240DWR2G.pdf
- Description:
- IC BUFF INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MC74ACT240DWR2G from onsemi is an octal 3-state buffer/line driver with TTL-compatible inputs, designed for memory address driving, clock distribution, and bidirectional bus interfacing in industrial control and embedded systems. It operates at 4.5–5.5 V, delivers ±24 mA output drive, features 6.0 ns typical propagation delay (VCC = 5.0 V), and uses SOIC-20W (Case 751D) packaging.
For engineers reviewing the MC74ACT240DWR2G datasheet, pinout, applications, or equivalent options, key selection criteria include 3-state bus contention control, TTL-level input compatibility, guaranteed 5.5 V absolute maximum supply rating, and industrial temperature range (−40°C to +85°C) operation.
Technical Context
The MC74ACT240DWR2G implements two independent 4-bit groups (Pins 12/14/16/18 and Pins 3/5/7/9), each controlled by separate 3-state enable inputs (OE1 and OE2). Its TTL-compatible inputs accept VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 5.0 V, enabling direct interface with legacy 5 V logic families without level translation.
Each output provides rail-to-rail switching with VOH ≥ 4.4 V (IOUT = −24 mA) and VOL ≤ 0.44 V (IOUT = 24 mA) under recommended operating conditions. Propagation delays are tightly specified: tPLH/tPHL ≤ 9.5 ns max (CL = 50 pF), and 3-state enable/disable times (tPZH/tPLZ/tPHZ/tPLZ) are ≤ 10.5 ns max across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - Ensures compatibility with standard 5 V TTL and CMOS systems while maintaining noise margin. |
| Output Drive | ±24 mA - Sufficient to drive multiple TTL loads or terminate short PCB traces without external buffers. |
| Propagation Delay | ≤9.5 ns (max, CL = 50 pF) - Supports high-speed bus timing in microcontroller peripherals and memory interfaces. |
| 3-State Enable Time | ≤9.5 ns (tPZH, VCC = 5.0 V) - Enables fast bus arbitration and dynamic signal routing in multiplexed architectures. |
| Input Compatibility | TTL-level (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - Directly interfaces with 74LS, 74F, and other legacy 5 V logic without level shifters. |
| Operating Temperature | −40°C to +85°C - Qualified for industrial-grade reliability in factory automation and outdoor electronics. |
| ESD Rating | Human Body Model > 2000 V - Provides robust handling during assembly and field service. |
Pinout & Package
MC74ACT240DWR2G is housed in a 20-lead SOIC Wide Body (SOIC-20W, Case 751D) package measuring 12.8 mm × 7.5 mm × 2.65 mm, with 1.27 mm pitch and Pb-free finish (G suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 20 | VCC / GND | Power supply (Pin 20) and ground (Pin 1) - Decoupling capacitor placement near these pins minimizes switching noise. |
| 12, 14, 16, 18 | Inputs A1–A4 | First 4-bit data inputs - Paired with OE1 (Pin 19) for group-level 3-state control. |
| 3, 5, 7, 9 | Inputs B1–B4 | Second 4-bit data inputs - Controlled independently by OE2 (Pin 2) for dual-bus isolation. |
| 11, 13, 15, 17 | Outputs Y1–Y4 (Group A) | Inverting outputs for first group - Active-low logic; high-impedance when OE1 = HIGH. |
| 4, 6, 8, 10 | Outputs Y5–Y8 (Group B) | Inverting outputs for second group - High-impedance when OE2 = HIGH; enables time-multiplexed bus sharing. |
| 19 | OE1 | Active-low 3-state enable for Group A - Driven LOW to enable outputs; tied HIGH for disable. |
| 2 | OE2 | Active-low 3-state enable for Group B - Allows independent control of two 4-bit channels on one bus. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit groups | Separate OE1/OE2 controls allow concurrent management of two address/data segments on shared physical bus lines. |
| TTL-compatible inputs | VIH ≥ 2.0 V and VIL ≤ 0.8 V at 5 V supply - Eliminates need for external level translators when interfacing with 74LS or microcontrollers with 5 V I/O. |
| Rail-to-rail output swing | VOH ≥ 4.4 V and VOL ≤ 0.44 V at ±24 mA load - Maintains full logic margin across temperature and voltage extremes. |
| Low 3-state leakage | IOZ ≤ ±5.0 μA - Prevents unintended current paths and signal corruption when outputs are disabled. |
| Pb-free SOIC-20W package | RoHS-compliant, moisture sensitivity level 1 - Supports lead-free reflow and long-term storage without baking. |
Applications
| Memory Address Buffering | Microcontroller Bus Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to external SRAM or flash memory. IC Role / Device Role / Timing Role: Octal buffer isolating MCU address pins from capacitive bus loading; dual OE control enables interleaved memory bank access. Use Value: Reduces address setup/hold time violations by lowering effective trace capacitance and providing clean edge transitions. |
Use Scenario: Connecting an 8-bit microcontroller data bus to a peripheral with 16-bit parallel interface. IC Role / Device Role / Timing Role: Bidirectional line driver with independent group enables synchronizing read/write strobes across two 4-bit lanes. Use Value: Enables time-multiplexed data transfer using single 8-bit port, eliminating need for additional GPIO or latch ICs. |
| Industrial PLC Backplane | Legacy System Signal Conditioning |
|
Use Scenario: Isolating and buffering digital I/O signals between CPU module and modular I/O cards in a DIN-rail mounted PLC. IC Role / Device Role / Timing Role: 3-state bus transceiver managing shared backplane data/address lines with hot-swap safe enable sequencing. Use Value: Prevents bus contention during card insertion/removal via controlled OE assertion and low IOZ leakage. |
Use Scenario: Interfacing modern FPGA I/O banks (3.3 V LVTTL) to legacy 5 V TTL peripherals like EPROM programmers or test equipment. IC Role / Device Role / Timing Role: Level-shifting buffer with TTL input thresholds and 5 V CMOS output swing - no external resistors required. Use Value: Achieves interoperability without discrete level translators, reducing BOM count and layout complexity. |
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 |
|---|---|---|---|
| SN74ACT240N | Same logic function and pinout; DIP-20 package instead of SOIC-20W; higher thermal resistance (JA = 70°C/W vs. 96°C/W). | Preferred for through-hole prototyping or legacy board upgrades where SOIC footprint is unavailable. | Select SN74ACT240N only when manual soldering or socket-based testing is required; not suitable for high-density SMT production. |
| MC74ACT240DWG | Identical electrical specs and SOIC-20W package; differs only in tape-and-reel quantity (1000 pcs vs. 2500 pcs for DWG variant). | No functional difference; used interchangeably in automated assembly where reel size matches feeder requirements. | MC74ACT240DWG offers same performance with larger reel - choose based on production volume and feeder compatibility. |
Compared with SN74ACT240N and MC74ACT240DWG, the MC74ACT240DWR2G provides optimized surface-mount manufacturability in a moisture-sensitive-level-1 package, tighter propagation delay consistency over temperature, and verified compatibility with high-speed 5 V bus designs requiring minimal layout overhead.
Availability
MC74ACT240DWR2G is available at Aetrix Electronics and suitable for industrial control systems, legacy system upgrades, and embedded microcontroller bus expansion requiring stable component supply, RoHS compliance, and long-lifecycle support.
Supply support for MC74ACT240DWR2G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC74ACT240DWR2G belongs to onsemi's legacy 74ACT logic family, engineered for robust 5 V TTL/CMOS interoperability in industrial and communications equipment where reliability and long-term availability are critical.
FAQ
What is the maximum supply voltage rating for MC74ACT240DWR2G?
The MC74ACT240DWR2G has an absolute maximum DC supply voltage (VCC) rating of +6.5 V, though it is specified for reliable operation only within 4.5–5.5 V per the Recommended Operating Conditions table. Exceeding 5.5 V may cause excessive ICC or accelerated wear but will not immediately damage the device if duration is brief and current-limited.
Does MC74ACT240DWR2G support non-inverting operation?
No, the MC74ACT240DWR2G is an inverting octal buffer - all eight outputs are logically inverted relative to their corresponding inputs. The truth table confirms that when OE is active (LOW), Y = NOT(D). For non-inverting functionality, the MC74ACT244DWR2G (non-inverting octal buffer) is the direct counterpart in the same family.
Can MC74ACT240DWR2G be used with 3.3 V microcontrollers?
The MC74ACT240DWR2G requires a minimum VCC of 4.5 V and is not rated for 3.3 V operation. Its TTL-compatible inputs do not guarantee recognition of 3.3 V logic HIGH levels, and VOH/VOL specs assume 5 V supply. Use a level translator or select a 3.3 V–compatible buffer such as SN74LVC240A for mixed-voltage systems.
What is the thermal resistance (θJA) of MC74ACT240DWR2G in its SOIC-20W package?
The MC74ACT240DWR2G in SOIC-20W (Case 751D) has a junction-to-ambient thermal resistance (θJA) of 96°C/W, as specified in the Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour and thermal vias beneath the exposed pad (if present) - though this package has no exposed pad.
Is MC74ACT240DWR2G pin-compatible with MC74AC240DWR2G?
Yes, MC74ACT240DWR2G and MC74AC240DWR2G share identical pinout, package (SOIC-20W), and functional block diagram. The key difference is input threshold: MC74ACT240DWR2G accepts TTL-level inputs (VIH ≥ 2.0 V), while MC74AC240DWR2G requires CMOS-level inputs (VIH ≥ 3.15 V at VCC = 4.5 V). Swapping them may cause logic misreads in marginal cases.
MC74ACT240DWR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
MC74ACT240DWR2G FAQ
1.How can I place an order for MC74ACT240DWR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74ACT240DWR2G 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 MC74ACT240DWR2G reliable?
The price and inventory of MC74ACT240DWR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT240DWR2G is usually 5 days.
3.What payment methods are accepted for MC74ACT240DWR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT240DWR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74ACT240DWR2G?
MC74ACT240DWR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74ACT240DWR2G 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 MC74ACT240DWR2G?
For technical support, including MC74ACT240DWR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT240DWR2G requirements.
6.How does Aetrix verify that MC74ACT240DWR2G is sourced from the original manufacturer or authorized distributors?
All MC74ACT240DWR2G 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 MC74ACT240DWR2G meets industry standards.
7.What is the process for return or replacement of MC74ACT240DWR2G?
All MC74ACT240DWR2G units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT240DWR2G, 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 MC74ACT240DWR2G part is unused and in its original packaging.
Return procedure for MC74ACT240DWR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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