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onsemi MC74LCX240DWR2
- Part No.:
- MC74LCX240DWR2
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74LCX240DWR2.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,386
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Product details
Overview
MC74LCX240DWR2 from onsemi is a low-voltage CMOS octal inverting buffer with 3-state outputs, designed for 1.65–5.5 V operation and featuring 5 V-tolerant inputs/outputs, ±24 mA output drive at 3 V, and 10 µA quiescent supply current in all logic states. It serves as a bus interface and memory address driver in mixed-voltage systems.
For engineers reviewing the MC74LCX240DWR2 datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V tolerance in 3.3 V domains, fast propagation delay (≤6.5 ns at 3.3 V), high-impedance TTL-compatible inputs, and SOIC-20 WB package compatibility with legacy board layouts.
Technical Context
The MC74LCX240DWR2 implements dual 4-bit inverting buffers (1Dn→1On and 2Dn→2On) with independent 3-state control via two OE inputs (1OE and 2OE). Each output pair supports bidirectional bus isolation with guaranteed high-impedance state when OE is HIGH.
Its IOFF specification ensures <10 µA power-off leakage when VCC = 0 V, enabling live insertion in hot-swap systems. The device meets LVTTL and LVCMOS logic thresholds across its full 1.65–5.5 V supply range and sustains >2000 V HBM ESD robustness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 5.5 V - enables direct interfacing between 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without level shifters |
| Input Voltage Tolerance | −0.5 V to +6.5 V - allows safe connection to 5 V TTL outputs while powered from 3.3 V or lower supplies |
| Output Drive (3 V) | ±24 mA - sufficient to drive 50 Ω transmission lines or multiple LVTTL loads without external buffering |
| Propagation Delay | 6.5 ns max at 3.3 V - supports >100 MHz bus toggle rates in address/data path applications |
| Quiescent ICC | 10 µA - reduces system standby power in battery-backed or energy-sensitive embedded controllers |
| IOFF Leakage | 10 µA max at VCC = 0 V - prevents back-powering of unpowered rails during hot-plug events |
| ESD Rating (HBM) | >2000 V - exceeds JEDEC JESD22-A114-A requirements for industrial-grade reliability |
Pinout & Package
MC74LCX240DWR2 is housed in a 20-pin SOIC-20 Wide Body (Case 751D) package with 1.27 mm pitch, 12.8 mm × 7.5 mm footprint, and 2.65 mm max height - compatible with standard SOIC-20 reflow profiles and legacy PCB footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Output Enable (1OE, 2OE) | Active-Low controls enable/disable for respective 4-bit buffer banks; HIGH forces outputs into high-impedance state |
| 2, 4, 6, 8, 17, 15, 13, 11 | Data Inputs (1D0–1D3, 2D0–2D3) | Inverting inputs driving corresponding outputs; TTL-compatible thresholds reduce loading on upstream drivers |
| 18, 16, 14, 12, 3, 5, 7, 9 | 3-State Outputs (1O0–1O3, 2O0–2O3) | Inverted buffered outputs with 24 mA sink/source capability; tri-stated when OE = HIGH |
| 10 | GND | Ground reference for all I/O and internal circuitry; must be connected to system ground plane |
| 20 | VCC | Primary power supply input; decoupling capacitor (0.1 µF) required within 5 mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-Tolerant I/O | Enables seamless integration into mixed-voltage systems where 3.3 V MCUs interface with 5 V peripherals or legacy buses |
| Live Insertion Support | IOFF specification guarantees <10 µA leakage at VCC = 0 V, allowing safe hot-plug into powered backplanes |
| Balanced Output Drive | ±24 mA at 3 V ensures matched rise/fall times and reduced signal skew across all eight outputs |
| Ultra-Low Static Current | 10 µA ICC in all three logic states minimizes quiescent power in always-on subsystems like watchdog or reset logic |
| Latchup Immunity | Exceeds 100 mA per JEDEC JESD78 - eliminates risk of destructive latchup in noisy industrial environments |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a 3.3 V microcontroller to a 5 V SRAM or Flash memory array. IC Role / Device Role / Timing Role: Inverting octal buffer providing voltage-level translation and fanout amplification while maintaining timing integrity. Use Value: Eliminates need for discrete level shifters; 6.5 ns propagation delay preserves setup/hold margins at 25 MHz bus clock rates. |
Use Scenario: Isolating PLC I/O modules from a central 3.3 V controller using a shared 5 V backplane data bus. IC Role / Device Role / Timing Role: Bidirectional bus transceiver buffer with independent OE control per 4-bit lane for selective module communication. Use Value: 5 V-tolerant I/O withstands backplane noise transients; tri-state capability prevents bus contention during module hot-swap. |
| Low-Power Sensor Hub | Legacy Peripheral Adapter |
|
Use Scenario: Aggregating digital sensor outputs (e.g., temperature, pressure) onto a low-voltage MCU bus while minimizing sleep-mode current draw. IC Role / Device Role / Timing Role: Low-quiescent-current buffer isolating sensors from MCU I/O pins during deep-sleep states. Use Value: 10 µA ICC extends battery life in wireless sensor nodes; IOFF prevents reverse current flow when MCU is powered down. |
Use Scenario: Connecting modern 1.8 V/3.3 V SoCs to legacy ISA or PC/104 peripherals requiring 5 V logic levels. IC Role / Device Role / Timing Role: Voltage-tolerant interface buffer enabling backward compatibility without redesigning host PCB. Use Value: Single-chip solution replaces discrete resistor-divider networks; SOIC-20 WB footprint matches existing adapter board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC240APWR | Lower max supply (3.6 V), no 5 V tolerance - requires external clamping for 5 V inputs | Restricted to ≤3.6 V systems; unsuitable for direct 5 V bus interfacing | Select when operating exclusively in 1.65–3.6 V domains and cost sensitivity outweighs voltage flexibility |
| 74ALVC240MTCX | Higher speed (4.2 ns typ at 3.3 V), same 5 V tolerance, but higher ICC (20 µA quiescent) | Better for high-frequency bus arbitration; less optimal for ultra-low-power sleep modes | Prefer when sub-5 ns propagation is critical and 10 µA quiescent current is not mandatory |
Compared with SN74LVC240APWR and 74ALVC240MTCX, MC74LCX240DWR2 uniquely balances 5 V tolerance, 10 µA quiescent current, and SOIC-20 WB packaging - making it optimal for mixed-voltage industrial adapters where power efficiency and legacy compatibility coexist.
Availability
MC74LCX240DWR2 is available at Aetrix Electronics and suitable for memory address buffering, industrial bus interfacing, and low-power sensor hub applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC74LCX240DWR2 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74LCX240DWR2 belongs to onsemi's LCX low-voltage CMOS logic family, engineered for mixed-supply system interfacing with emphasis on voltage tolerance, low static power, and robustness in harsh environments.
FAQ
What is the maximum supply voltage rating for MC74LCX240DWR2?
The MC74LCX240DWR2 supports a DC supply voltage (VCC) range of −0.5 V to +6.5 V, with recommended operation from 1.65 V to 5.5 V. This extended absolute maximum rating ensures robustness against transient overvoltage events on the VCC rail, while the 5.5 V upper limit aligns with standard 5 V system design margins. The MC74LCX240DWR2 remains functional and reliable across this full range when operated within its specified thermal and current limits.
Does MC74LCX240DWR2 support hot-plug operation?
Yes, MC74LCX240DWR2 supports live insertion and withdrawal due to its IOFF specification, which guarantees high-impedance behavior and <10 µA leakage current when VCC = 0 V. This feature prevents back-driving of unpowered supply rails and avoids damaging current paths during hot-swap events in modular backplane systems. The MC74LCX240DWR2 is explicitly characterized for this behavior in its datasheet under "Features" and "Maximum Ratings" sections.
What is the output drive capability of MC74LCX240DWR2 at 3.3 V?
At VCC = 3.3 V, MC74LCX240DWR2 delivers ±24 mA output sink and source current - verified across temperature (−40 °C to +125 °C) and process corners. This balanced drive strength ensures clean signal edges into typical 50 Ω transmission lines or up to 10 LVTTL loads, directly supporting high-speed bus signaling without external buffering. The MC74LCX240DWR2 maintains this performance while consuming only 10 µA quiescent current.
Can MC74LCX240DWR2 interface directly with 5 V TTL logic?
Yes, MC74LCX240DWR2 features 5 V-tolerant inputs and outputs, meaning it can accept 0–5.5 V input signals and drive 5 V logic levels while powered from as low as 1.65 V. Its VIH/VIL thresholds scale with VCC, and its output VOH/VOL meet TTL specifications across the full supply range. This capability allows MC74LCX240DWR2 to serve as a direct bridge between 3.3 V microcontrollers and legacy 5 V peripherals without external level-shifting components.
What package type is used for MC74LCX240DWR2?
MC74LCX240DWR2 uses the SOIC-20 Wide Body (SOIC-20 WB) package, also designated Case 751D, with 1.27 mm lead pitch, 12.8 mm × 7.5 mm body dimensions, and Pb-free (RoHS-compliant) finish. This package is pin-compatible with industry-standard SOIC-20 footprints and supports conventional reflow soldering processes. The MC74LCX240DWR2 marking "LCX240" appears on the top surface, consistent with onsemi's generic SOIC-20 WB marking convention.
MC74LCX240DWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MC74LCX240DWR2 FAQ
1.How can I place an order for MC74LCX240DWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX240DWR2 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 MC74LCX240DWR2 reliable?
The price and inventory of MC74LCX240DWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX240DWR2 is usually 5 days.
3.What payment methods are accepted for MC74LCX240DWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX240DWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74LCX240DWR2?
MC74LCX240DWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX240DWR2 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 MC74LCX240DWR2?
For technical support, including MC74LCX240DWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX240DWR2 requirements.
6.How does Aetrix verify that MC74LCX240DWR2 is sourced from the original manufacturer or authorized distributors?
All MC74LCX240DWR2 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 MC74LCX240DWR2 meets industry standards.
7.What is the process for return or replacement of MC74LCX240DWR2?
All MC74LCX240DWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX240DWR2, 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 MC74LCX240DWR2 part is unused and in its original packaging.
Return procedure for MC74LCX240DWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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