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onsemi MC74HC240ADWR2G
- Part No.:
- MC74HC240ADWR2G
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74HC240ADWR2G.pdf
- Description:
- IC BUFFER INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,128
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Product details
Overview
MC74HC240ADWR2G from onsemi is an octal 3-state inverting buffer/line driver with two active-low output enables, operating from 2.0 V to 6.0 V, delivering ±7.8 mA output drive at 6.0 V, and supporting automotive-grade AEC-Q100 qualification for use in engine control modules and body electronics.
For engineers reviewing the MC74HC240ADWR2G datasheet, pinout, applications, or equivalent options, this device serves as a high-noise-immunity, CMOS-compatible interface between microcontrollers and memory address buses, clock distribution networks, or bus-hold systems requiring bidirectional signal conditioning with independent group enable control.
Technical Context
The MC74HC240ADWR2G implements eight independent inverting logic gates, partitioned into two groups (A and B), each controlled by its own active-low enable (Enable A on Pin 1, Enable B on Pin 19). Outputs enter high-impedance state when either enable is high, enabling bus sharing without contention.
It features silicon-gate CMOS construction with 120 FETs (30 equivalent gates), JEDEC Std. 7A compliance, and input compatibility with both standard CMOS and LSTTL (with pullup resistors). Propagation delay is 14 ns typical at VCC = 6.0 V, and transition time is 10 ns under same conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU to 5 V peripheral bus) |
| Output Drive Capability | ±7.8 mA at VCC = 6.0 V - drives 15 LSTTL loads directly without external buffers |
| Propagation Delay (A→YA) | 14 ns max at VCC = 6.0 V - enables reliable timing in 30+ MHz address/data strobe paths |
| Input Leakage Current | ±0.1 µA max at VCC = 6.0 V - ensures stable logic levels in low-power sleep modes |
| Three-State Leakage | ±0.5 µA max at VCC = 6.0 V - prevents unintended current paths during bus isolation |
| Operating Temperature | –55 °C to +125 °C - qualified for under-hood automotive environments |
| ESD Withstand | >2000 V HBM - robust handling in automated PCB assembly lines |
Pinout & Package
MC74HC240ADWR2G is housed in a SOIC-20 Wide (Case 751D) package, 12.95 mm × 7.60 mm × 2.65 mm, with 1.27 mm pitch, Pb-free, RoHS-compliant, MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Enable A / Enable B | Active-low group enables - independently disable A-group (Pins 2,4,6,8 → YA1–YA4) or B-group (Pins 11,13,15,17 → YB1–YB4) |
| 2,4,6,8 | A1–A4 Inputs | Inverted data inputs for first four outputs - match LS240 pinout for drop-in replacement in legacy designs |
| 11,13,15,17 | B1–B4 Inputs | Inverted data inputs for second four outputs - allow dual-bus isolation (e.g., address vs. control lines) |
| 18,16,14,12 | YA1–YA4 Outputs | Inverting buffered outputs for A-group - high-impedance when Enable A = high |
| 9,7,5,3 | YB1–YB4 Outputs | Inverting buffered outputs for B-group - high-impedance when Enable B = high |
| 10 | GND | Ground reference for all logic and power domains - must be low-inductance connection for noise immunity |
| 20 | VCC | Positive supply rail - decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| Octal inverting 3-state architecture | Enables dual-channel bus buffering with independent enable control - eliminates need for discrete enable logic |
| CMOS/NMOS/TTL interface compatibility | Direct connection to 3.3 V microcontrollers, 5 V peripherals, and legacy TTL without level shifters |
| AEC-Q100 qualified (−Q variant) | Validated for automotive applications including powertrain and chassis control modules per Grade 1 requirements |
| High noise immunity | Typical noise margin >1.3 V at VCC = 5 V - suppresses EMI-induced glitches in noisy engine bays |
| Pb-free, halogen-free, RoHS-compliant | Meets IPC-J-STD-020 moisture sensitivity Level 3 - suitable for lead-free reflow profiles (peak 260 °C) |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating and inverting sensor address lines between MCU and analog front-end ASIC in real-time combustion timing circuits. IC Role / Device Role / Timing Role: Octal inverting buffer with group-selectable 3-state outputs - provides glitch-free address multiplexing during mode transitions. Use Value: Enables deterministic 14 ns propagation delay and <0.5 µA leakage in high-temp environments, ensuring timing integrity across –40 °C to +125 °C operation. |
Use Scenario: Driving multiple isolated relay drivers from a single 3.3 V FPGA I/O bank in modular I/O racks. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer - converts low-drive FPGA outputs to 5 V/±7.8 mA signals compatible with industrial optocouplers. Use Value: Eliminates external pullups and discrete transistors while maintaining 15 LSTTL load capability and AEC-Q100 reliability. |
| Legacy Memory Subsystem Interface | Test Equipment Signal Conditioning |
Use Scenario: Replacing obsolete 74LS240 in vintage computer memory expansion cards requiring pin-compatible upgrade path. IC Role / Device Role / Timing Role: Drop-in LS240 functional equivalent - identical pinout, inverting logic, and dual-enable architecture. Use Value: Reduces power consumption by 90% versus LS240 (ICC = 4 µA vs. ~40 mA) while preserving board layout and firmware. |
Use Scenario: Conditioning high-speed digital stimulus signals in automated test equipment where channel isolation and fast enable/disable are critical. IC Role / Device Role / Timing Role: Dual-group 3-state gate - allows dynamic routing of test vectors to DUT pins without hardware reconfiguration. Use Value: Achieves 19 ns enable-to-output delay and <10 ns transition time, supporting 50+ MHz pattern rates with minimal skew. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC240N | SOIC-20, commercial grade (–40 °C to +85 °C), no AEC-Q100 qualification, identical electrical specs and pinout | Limited to non-automotive industrial or consumer applications; not validated for PPAP or automotive lifecycle management | Select when cost sensitivity outweighs extended temperature or automotive qualification requirements |
| MC74HC240ADTG | TSSOP-20 package (7.6 mm × 4.4 mm), same AEC-Q100 qualification, 2500-unit tape-and-reel, higher thermal resistance (150 °C/W) | Preferred for space-constrained PCBs; requires adjusted solder profile due to finer pitch (0.65 mm) | Select when board area is constrained and thermal derating is acceptable for ambient <85 °C |
Compared with SN74HC240N and MC74HC240ADTG, the MC74HC240ADWR2G uniquely combines SOIC-20 wide-body mechanical robustness, automotive qualification, and 1000-unit tape-and-reel packaging - making it optimal for production ramp of AEC-Q100-compliant modules where manufacturability and long-term supply continuity are prioritized.
Availability
MC74HC240ADWR2G is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and legacy memory subsystem upgrades requiring stable component supply, long-lifecycle support, and AEC-Q100 traceability.
Supply support for MC74HC240ADWR2G 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 MC74HC240ADWR2G belongs to onsemi's HC-series high-performance silicon-gate CMOS logic family, engineered for low-power, high-noise-immunity interfacing in mission-critical automotive and industrial control systems.
FAQ
What is the maximum operating temperature range for MC74HC240ADWR2G?
The MC74HC240ADWR2G is rated for operation from –55 °C to +125 °C and is AEC-Q100 qualified for Grade 1 automotive applications. This specification is verified per the manufacturer's Recommended Operating Conditions table and applies to the SOIC-20 Wide package under continuous bias with proper PCB thermal design.
Does MC74HC240ADWR2G support 3.3 V logic systems?
Yes, MC74HC240ADWR2G operates reliably at VCC = 3.3 V, with guaranteed VIH = 2.1 V and VIL = 0.9 V at that voltage. Its CMOS inputs interface directly with 3.3 V microcontrollers and FPGAs without level shifting, and output drive remains sufficient for driving 15 LSTTL loads even at reduced supply.
Is MC74HC240ADWR2G pin-compatible with the 74LS240?
Yes, MC74HC240ADWR2G is explicitly designed to be pinout-identical to the 74LS240, as confirmed in the datasheet's opening statement and Figure 1. Both share identical pin assignments for inputs, outputs, enables, VCC, and GND - enabling direct replacement in legacy boards without layout changes.
What is the meaning of the "−Q" suffix in MC74HC240ADWR2G−Q*?
The "−Q" suffix in MC74HC240ADWR2G−Q* denotes automotive qualification: AEC-Q100 compliance, PPAP capability, and unique site/control change requirements. While MC74HC240ADWR2G itself is the commercial-grade version, the −Q variant shares the same SOIC-20 Wide package and electrical specs but adds automotive-specific process controls and traceability.
Can MC74HC240ADWR2G drive a 50 Ω transmission line directly?
No, MC74HC240ADWR2G is not designed for 50 Ω line driving. Its output structure targets LSTTL loading (≈350 Ω), with typical output impedance >50 Ω and no controlled slew-rate or termination support. For 50 Ω systems, a dedicated line driver IC or external series termination is required to prevent reflections and overshoot.
MC74HC240ADWR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MC74HC240ADWR2G FAQ
1.How can I place an order for MC74HC240ADWR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC240ADWR2G 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 MC74HC240ADWR2G reliable?
The price and inventory of MC74HC240ADWR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC240ADWR2G is usually 5 days.
3.What payment methods are accepted for MC74HC240ADWR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC240ADWR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC240ADWR2G?
MC74HC240ADWR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC240ADWR2G 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 MC74HC240ADWR2G?
For technical support, including MC74HC240ADWR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC240ADWR2G requirements.
6.How does Aetrix verify that MC74HC240ADWR2G is sourced from the original manufacturer or authorized distributors?
All MC74HC240ADWR2G 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 MC74HC240ADWR2G meets industry standards.
7.What is the process for return or replacement of MC74HC240ADWR2G?
All MC74HC240ADWR2G units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC240ADWR2G, 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 MC74HC240ADWR2G part is unused and in its original packaging.
Return procedure for MC74HC240ADWR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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