My Inquiry
My Account
onsemi MC74LCX244DWG
- Part No.:
- MC74LCX244DWG
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74LCX244DWG.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,552
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC74LCX244DWG 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 5.5 V absolute input voltage rating, and supports live insertion/withdrawal. It is used in memory address driving and TTL-level bus transceiver applications.
For engineers reviewing the MC74LCX244DWG datasheet, pinout, applications, or equivalent options, key selection considerations include 5 V tolerance on 1.65–5.5 V operation, 24 mA balanced sink/source capability, 7.3 ns max propagation delay at 5 V, IOFF protection at VCC = 0 V, and SOIC-20 WB package compatibility.
Technical Context
The MC74LCX244DWG implements dual 4-bit non-inverting buffers with independent 3-state control via two OE inputs (1OE, 2OE). Each buffer group drives four outputs (1O0–1O3, 2O0–2O3) from corresponding inputs (1D0–1D3, 2D0–2D3), with TTL-compatible thresholds and LVTTL/LVCMOS logic level interoperability.
Its 5 V-tolerant I/O architecture enables safe interfacing with legacy 5 V systems while powered from sub-3.3 V rails. The IOFF specification ensures high-impedance isolation when VCC = 0 V, supporting hot-swap functionality without back-powering or latch-up risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 5.5 V - Enables direct interface with 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without level shifters. |
| Input Voltage Max | 5.5 V - Allows safe connection to 5 V TTL outputs even when device is powered at 1.65 V. |
| Output Drive | ±24 mA - Sufficient for driving multiple TTL loads or moderate-capacitance buses without external buffering. |
| Propagation Delay | 5.9 ns max at 4.5–5.5 V - Supports high-speed address/data bus timing in memory and peripheral interfaces. |
| IOFF Leakage | 10 µA max at VCC = 0 V - Guarantees true high-impedance state during power-down or hot-insertion scenarios. |
| Quiescent ICC | 10 µA max - Minimizes standby power in battery-sensitive or always-on embedded systems. |
| ESD HBM | >2000 V - Provides robust handling margin during board assembly and field service. |
Pinout & Package
MC74LCX244DWG is housed in a 20-pin SOIC Wide Body (SOIC-20 WB, Case 751D) package with standard 1.27 mm pitch and 7.5 mm body width. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enable inputs controlling respective 4-bit buffer groups; HIGH disables outputs into high-Z. |
| 2, 4, 6, 8, 17, 15, 13, 11 | 1D0–1D3, 2D0–2D3 | Eight data inputs - grouped as two independent 4-bit channels for parallel bus segmentation. |
| 18, 16, 14, 12, 3, 5, 7, 9 | 1O0–1O3, 2O0–2O3 | Eight 3-state non-inverting outputs - each mirrors its corresponding input when OE is LOW. |
| 10 | GND | Ground reference for all logic and I/O circuits; must be low-impedance for noise immunity. |
| 20 | VCC | Primary power supply pin - accepts 1.65–5.5 V; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-Tolerant I/O | Enables mixed-voltage system integration without external level translators - critical for upgrading legacy 5 V buses to lower-power logic. |
| Live Insertion Support | IOFF and high-impedance tri-state behavior prevent bus contention and back-driving during hot-plug operations in modular backplane systems. |
| 24 mA Balanced Drive | Eliminates need for external drivers in memory address latching or microcontroller GPIO expansion where fan-out exceeds 10 LSTTL loads. |
| Near-Zero Static Current | 10 µA ICC reduces quiescent power to negligible levels - essential for always-on IoT edge nodes and portable instrumentation. |
| Latchup Immunity | Exceeds 500 mA per JEDEC JESD78 - ensures robustness against transient overvoltage events in industrial control environments. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a 3.3 V microcontroller to a 5 V SRAM or EPROM. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing level-tolerant, low-skew address signal amplification with tri-state isolation during bus arbitration. Use Value: Eliminates discrete level shifters while maintaining <7 ns propagation delay and preventing bus contention during memory read/write cycles. |
Use Scenario: Isolating and buffering control signals between a 1.8 V FPGA and 5 V PLC I/O modules. IC Role / Device Role / Timing Role: Dual-group 3-state buffer enabling bidirectional signal routing with independent enable control per channel. Use Value: Supports hot-swappable I/O card insertion via IOFF protection and withstands 5 V transients without damage or latchup. |
| Low-Power Peripheral Interface | Embedded System GPIO Expansion |
|
Use Scenario: Expanding GPIO count of an ARM Cortex-M0+ MCU operating at 1.8 V to drive 5 V sensors and actuators. IC Role / Device Role / Timing Role: Voltage-tolerant buffer translating logic states across supply domains while sourcing/sinking up to 24 mA per pin. Use Value: Reduces BOM cost and PCB area versus discrete MOSFET-based level shifters, with guaranteed 5.5 V input safety margin. |
Use Scenario: Adding eight additional push-pull outputs to a space-constrained medical device controller using 2.5 V logic. IC Role / Device Role / Timing Role: Octal non-inverting driver with ultra-low 10 µA quiescent current, enabling always-on status indication without battery drain. Use Value: Delivers full 24 mA drive capability at 2.5 V while consuming less than 25 µW static power - ideal for battery-backed diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower 1.65–3.6 V VCC range; no 5 V tolerance - requires external clamping or level shifting for 5 V inputs. | Best suited for pure 3.3 V or lower systems; not drop-in for mixed 5 V/3.3 V buses. | Select when operating exclusively below 3.6 V and cost sensitivity outweighs 5 V interface flexibility. |
| 74ALVC244MTCX | Higher speed (4.2 ns typ propagation), same 1.65–3.6 V range, no 5 V tolerance; higher ICC in active state. | Preferred for high-frequency data paths where timing margin is critical and 5 V signals are absent. | Choose for sub-5 ns timing-critical applications in 3.3 V-only designs where power efficiency is secondary. |
Compared with SN74LVC244APWR and 74ALVC244MTCX, the MC74LCX244DWG uniquely supports direct 5 V input interfacing at any VCC ≥1.65 V, making it the only option among the three that eliminates external protection circuitry in mixed-voltage industrial and legacy upgrade scenarios.
Availability
MC74LCX244DWG is available at Aetrix Electronics and suitable for memory address buffering, industrial bus transceivers, and low-power peripheral interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MC74LCX244DWG 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT markets.
The MC74LCX244DWG belongs to the LCX family of low-voltage CMOS logic devices designed specifically for mixed-supply-system interfacing, emphasizing 5 V tolerance, live insertion, and ultra-low static power in space-constrained embedded applications.
FAQ
What is the maximum input voltage rating for MC74LCX244DWG?
The MC74LCX244DWG supports a DC input voltage (VI) of −0.5 V to +6.5 V, with a guaranteed safe operating range up to +5.5 V under normal conditions. This 5 V tolerance allows direct connection to 5 V TTL outputs even when powered from 1.65 V, eliminating the need for external level-shifting components in mixed-voltage designs.
Does MC74LCX244DWG support hot-swap operation?
Yes, MC74LCX244DWG supports live insertion and withdrawal due to its IOFF specification, which guarantees high-impedance outputs when VCC = 0 V. This prevents back-powering or bus contention during hot-plug events in modular backplanes or field-replaceable units, meeting industrial reliability requirements without additional circuitry.
What is the output drive strength of MC74LCX244DWG at 3.3 V supply?
At VCC = 3.3 V, the MC74LCX244DWG delivers a minimum output sink current of 24 mA and source current of 22 mA (per output), as specified in the DC Electrical Characteristics table. This balanced drive capability ensures reliable interfacing with up to 10 LSTTL loads or moderate PCB trace capacitance in address/data bus applications.
Is MC74LCX244DWG RoHS compliant and lead-free?
Yes, MC74LCX244DWG is RoHS compliant, Pb-free, halogen-free, and BFR-free, as confirmed in the datasheet's Features section and ordering information. The "G" suffix in the part number explicitly denotes the lead-free package, and the SOIC-20 WB (Case 751D) meets JEDEC standards for green manufacturing and reflow compatibility.
What package type is used for MC74LCX244DWG?
MC74LCX244DWG 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 surface-mount compatibility. This package is optimized for automated assembly and provides thermal resistance (θJA) of 96 °C/W on standard FR4 PCBs.
MC74LCX244DWG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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-SOIC
MC74LCX244DWG FAQ
1.How can I place an order for MC74LCX244DWG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX244DWG 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 MC74LCX244DWG reliable?
The price and inventory of MC74LCX244DWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX244DWG is usually 5 days.
3.What payment methods are accepted for MC74LCX244DWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX244DWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74LCX244DWG?
MC74LCX244DWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX244DWG 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 MC74LCX244DWG?
For technical support, including MC74LCX244DWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX244DWG requirements.
6.How does Aetrix verify that MC74LCX244DWG is sourced from the original manufacturer or authorized distributors?
All MC74LCX244DWG 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 MC74LCX244DWG meets industry standards.
7.What is the process for return or replacement of MC74LCX244DWG?
All MC74LCX244DWG units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX244DWG, 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 MC74LCX244DWG part is unused and in its original packaging.
Return procedure for MC74LCX244DWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC74LCX244DWG Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
