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onsemi MC74LCX244DTR2
- Part No.:
- MC74LCX244DTR2
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC74LCX244DTR2.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,109
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Product details
Overview
MC74LCX244DTR2 from onsemi is a low-voltage CMOS octal non-inverting 3-state buffer with 5 V-tolerant inputs and outputs, operating from 1.65 V to 5.5 V supply. It delivers ±24 mA output drive, features IOFF protection at VCC = 0 V, and supports live insertion in bus-oriented systems such as memory address driving and TTL-level data buses.
For engineers reviewing the MC74LCX244DTR2 datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V tolerance on all I/Os, 7.3 ns max propagation delay at 5 V, 20-pin TSSOP package, and AEC-Q100 qualification for automotive use.
Technical Context
The MC74LCX244DTR2 implements dual 4-bit non-inverting buffers with independent 3-state control via two OE inputs (1OE, 2OE), enabling selective bus isolation. Its input structure guarantees high-impedance TTL-compatible loading and 5.5 V absolute maximum input voltage rating.
Output stage design provides balanced ±24 mA sink/source capability across 1.65–5.5 V VCC, with near-zero static ICC (10 µA) in all logic states and guaranteed high-impedance (Z) output when OE is HIGH. The device meets IOFF specification for back-drive safety during power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 5.5 V - Enables interoperability between 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains |
| Input Voltage Max | −0.5 V to +6.5 V - Supports safe interfacing with legacy 5 V TTL without level shifters |
| Output Drive | ±24 mA - Sufficient to drive 50 Ω transmission lines or multiple LVTTL/LVCMOS loads |
| Propagation Delay | 5.9 ns max at VCC = 4.5–5.5 V - Enables reliable operation in high-speed address/data bus applications |
| IOFF Leakage | 10 µA max at VCC = 0 V - Prevents back-powering or signal corruption during hot-swap events |
| ESD Rating | >2000 V HBM - Provides robust handling margin in manufacturing and field service environments |
| Operating Temp | −55 °C to +125 °C - Qualified for extended industrial and automotive under-hood applications |
Pinout & Package
TSSOP-20 package (Case 948E), 0.65 mm pitch, 6.5 mm × 4.4 mm body, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-Low Output Enable controls first/second 4-bit buffer group independently |
| 2, 4, 6, 8 | 1D0–1D3 | Data inputs for first buffer group - 5 V tolerant, high-impedance when not driven |
| 18, 16, 14, 12 | 1O0–1O3 | Non-inverting 3-state outputs for first group - driven LOW/HIGH or placed in Z-state per OE |
| 17, 15, 13, 11 | 2D0–2D3 | Data inputs for second buffer group - identical electrical specs to 1Dn pins |
| 3, 5, 7, 9 | 2O0–2O3 | Non-inverting 3-state outputs for second group - fully isolated from first group |
| 10 | GND | Ground reference for all internal circuitry and I/O stages |
| 20 | VCC | Single supply rail powering both buffer sections and OE logic |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-Tolerant I/O | Enables direct connection to 5 V microcontrollers or peripherals without external level translators |
| Live Insertion Support | IOFF and high-impedance inputs prevent bus contention during hot-plug operations in modular systems |
| Low Static Power | 10 µA ICC in all three logic states reduces system standby current and thermal load |
| Latchup Immunity | >500 mA latchup current rating ensures robustness against transient-induced parasitic thyristor activation |
| AEC-Q100 Qualified | Validated for automotive applications including engine control units and body electronics modules |
Applications
| Memory Address Driving | Industrial Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address bus from a low-voltage microcontroller to external SRAM or flash memory. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing level translation and fanout amplification while maintaining timing integrity. Use Value: Eliminates need for discrete level-shifting components and reduces propagation delay skew across address lines to ≤1.0 ns. |
Use Scenario: Isolating PLC I/O module data paths between 3.3 V FPGA and legacy 5 V sensor/actuator interfaces. IC Role / Device Role / Timing Role: Bidirectional bus buffer with independent OE control enabling time-multiplexed read/write arbitration. Use Value: Prevents ground loop noise coupling and allows safe hot-swap of I/O cards without disrupting master controller operation. |
| Automotive Body Control | Test Equipment Signal Conditioning |
Use Scenario: Interfacing 1.8 V CAN controller MCU to 5 V dashboard display driver ICs in AEC-Q100-compliant vehicle platforms. IC Role / Device Role / Timing Role: Voltage-tolerant signal repeater ensuring glitch-free communication during battery brownout conditions. Use Value: Maintains functional safety by guaranteeing no false transitions during VCC ramp-up/down sequences per ISO 16750-2. |
Use Scenario: Buffering digital stimulus signals from arbitrary waveform generator to DUT input pins in automated test fixtures. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer isolating source impedance and minimizing signal reflection on long PCB traces. Use Value: Reduces measurement uncertainty by limiting output-to-output skew to ≤1.0 ns and dynamic ground bounce to ≤0.8 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower max VCC (3.6 V), no 5 V tolerance - requires external clamping for 5 V inputs | Suitable only for pure 3.3 V or lower systems; not qualified for automotive temperature range | Select when cost sensitivity outweighs 5 V interface requirement and AEC-Q100 is unnecessary |
| 74ALVC244MTCX | Same 5 V tolerance and 24 mA drive, but only rated to +85 °C ambient - lacks extended temp validation | Applicable in commercial-grade instrumentation but not under-hood automotive or industrial control cabinets | Choose for space-constrained TSSOP-20 designs where extended temperature operation is not required |
Compared with SN74LVC244APWR and 74ALVC244MTCX, the MC74LCX244DTR2 uniquely combines full 5 V I/O tolerance, −55 °C to +125 °C operation, and AEC-Q100 qualification in a single TSSOP-20 package - making it the only option for automotive-grade bus buffering where voltage interoperability and environmental ruggedness are mandatory.
Availability
MC74LCX244DTR2 is available at Aetrix Electronics and suitable for automotive body control modules, industrial programmable logic controllers, memory subsystems, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC74LCX244DTR2 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74LCX244DTR2 belongs to the LCX family of low-voltage CMOS logic devices designed specifically for mixed-voltage system interfacing, emphasizing 5 V tolerance, live-insertion safety, and extended temperature reliability in mission-critical embedded systems.
FAQ
What is the maximum supply voltage for MC74LCX244DTR2?
The MC74LCX244DTR2 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. Absolute maximum rating of +6.5 V ensures margin against transient overvoltage events, but sustained operation above 5.5 V is not specified and may impact reliability or parametric performance of the MC74LCX244DTR2.
Does MC74LCX244DTR2 support hot-swap or live insertion?
Yes, the MC74LCX244DTR2 supports live insertion and withdrawal due to its IOFF specification, which guarantees high-impedance I/O states when VCC = 0 V, and its 5 V-tolerant inputs that remain safe even when powered down. This behavior is verified per datasheet Section "Features" and Maximum Ratings table, making the MC74LCX244DTR2 suitable for modular backplane and hot-pluggable card applications.
What package type is used for MC74LCX244DTR2?
The MC74LCX244DTR2 uses the TSSOP-20 package (Case 948E), a 20-pin thin shrink small outline package with 0.65 mm pitch, 6.5 mm × 4.4 mm body size, and exposed pad variant not applicable. This package is Pb-free, RoHS compliant, and moisture sensitivity level (MSL) 1 - indicating unlimited floor life at standard conditions per JEDEC J-STD-020.
Is MC74LCX244DTR2 qualified for automotive applications?
Yes, the MC74LCX244DTR2 is AEC-Q100 qualified and PPAP capable, as confirmed by the "−Q" suffix in the ordering part number MC74LCX244DTR2G-Q* and explicitly stated in the datasheet Features section. It operates across −55 °C to +125 °C and meets automotive reliability requirements including latchup immunity (>500 mA) and ESD robustness (>2000 V HBM), making it suitable for engine control, body electronics, and ADAS subsystems.
What is the output drive strength of MC74LCX244DTR2 at 3.3 V supply?
At VCC = 3.3 V, the MC74LCX244DTR2 delivers a minimum output sink current of 24 mA (IOL) and a minimum output source current of 24 mA (IOH), as specified in the DC Electrical Characteristics table under "VOH" and "VOL" parameters. This balanced drive enables termination of 50 Ω transmission lines and fanout to up to 10 LVTTL loads without signal degradation - a key performance attribute of the MC74LCX244DTR2.
MC74LCX244DTR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-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 ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
MC74LCX244DTR2 FAQ
1.How can I place an order for MC74LCX244DTR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX244DTR2 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 MC74LCX244DTR2 reliable?
The price and inventory of MC74LCX244DTR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX244DTR2 is usually 5 days.
3.What payment methods are accepted for MC74LCX244DTR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX244DTR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74LCX244DTR2?
MC74LCX244DTR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX244DTR2 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 MC74LCX244DTR2?
For technical support, including MC74LCX244DTR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX244DTR2 requirements.
6.How does Aetrix verify that MC74LCX244DTR2 is sourced from the original manufacturer or authorized distributors?
All MC74LCX244DTR2 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 MC74LCX244DTR2 meets industry standards.
7.What is the process for return or replacement of MC74LCX244DTR2?
All MC74LCX244DTR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX244DTR2, 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 MC74LCX244DTR2 part is unused and in its original packaging.
Return procedure for MC74LCX244DTR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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