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onsemi MC74LCX245MG
- Part No.:
- MC74LCX245MG
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74LCX245MG.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOEIAJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,103
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Product details
Overview
MC74LCX245MG from onsemi is a non-inverting octal transceiver operating from 1.65 V to 5.5 V, featuring 5 V-tolerant inputs/outputs, 24 mA output drive at 3.0 V, bidirectional data flow controlled by T/R input, and 3-state outputs enabled by OE. It serves in memory address driving and TTL-level bus interfacing where voltage translation and bus isolation are required.
For engineers reviewing the MC74LCX245MG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, directional control logic, 5 V tolerance behavior, thermal resistance (99 °C/W for WQFN20), and real-world use cases in mixed-voltage system interconnects.
Technical Context
The MC74LCX245MG implements a dual-bus, bi-directional transceiver architecture with separate A and B port banks (A0–A7, B0–B7), direction controlled by active-HIGH T/R and 3-state enable via active-HIGH OE. Its IOFF specification ensures high-impedance state when VCC = 0 V, supporting live insertion.
It operates across −55 °C to +125 °C, supports LVTTL/LVCMOS logic families, and maintains <10 µA quiescent supply current in all three logic states - active HIGH, active LOW, and high-Z - minimizing system power draw during idle or tri-state conditions.
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 without level shifters |
| IOH/IOL Drive | ±24 mA at VCC = 3.0 V - sufficient to drive multiple TTL loads or terminate short PCB traces |
| tPLH/tPHL Max | 7.0 ns at VCC = 3.0–3.6 V - supports >100 MHz bus operation with tight timing margins |
| VI Absolute Max | −0.5 V to +6.5 V - allows safe connection to 5 V sources even when VCC ≤ 4.5 V |
| IOFF Leakage | ≤10 µA at VI = 5.5 V - prevents back-powering or signal corruption during power-down sequences |
| Capacitance | CIN = 7 pF, CI/O = 8 pF - low input loading preserves signal integrity on high-speed buses |
| Thermal Resistance | JA = 99 °C/W (WQFN20) - enables stable operation at full load in compact industrial enclosures |
Pinout & Package
MC74LCX245MG is packaged in a 20-pin QFN (2.5 mm × 4.5 mm, case 485AA), with exposed thermal pad, Pb-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A0–A7 Inputs/Outputs | Side A bidirectional I/O bank; driven by or drives external logic depending on T/R state |
| 9 | GND | Ground reference for all internal circuitry and I/O buffers |
| 10, 11, 12, 13, 14, 15, 16, 17 | B0–B7 Inputs/Outputs | Side B bidirectional I/O bank; mirrors A-side behavior under T/R control |
| 18 | VCC | Primary power supply for core logic and I/O drivers; must be decoupled locally |
| 19 | OE | Active-HIGH output enable; forces both A and B ports into high-impedance when HIGH |
| 20 | T/R | Active-HIGH transmit/receive control; HIGH routes A→B, LOW routes B→A |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-tolerant I/O | Enables direct interface with legacy 5 V TTL systems while powered from 1.8 V or 2.5 V rails |
| IOFF protection | Guarantees high-impedance I/O when VCC = 0 V, preventing back-current during hot-swap or partial power-down |
| 24 mA balanced drive | Supports fan-out of ≥10 LVTTL loads or termination of stubbed bus segments without external drivers |
| Sub-10 µA static ICC | Reduces standby power in battery-backed or always-on embedded controllers by >99% vs. standard CMOS transceivers |
| Latchup immunity | Exceeds 100 mA per JEDEC JESD78 - ensures robustness against transient overvoltage or ESD-induced latchup |
Applications
| Memory Address Bus Interface | Industrial PLC Backplane Interconnect |
|---|---|
Use Scenario: Isolating and translating address signals between a 3.3 V microcontroller and 5 V SRAM or EPROM. IC Role / Device Role / Timing Role: Bidirectional address transceiver enabling safe, low-skew propagation of 8-bit address lines across voltage domains. Use Value: Eliminates need for discrete level shifters while maintaining <7 ns propagation delay and 5 V tolerance on all pins. | Use Scenario: Connecting modular I/O cards to a central 2.5 V FPGA controller in a DIN-rail mounted PLC chassis. IC Role / Device Role / Timing Role: Voltage-agile bus transceiver managing data exchange between mixed-supply modules with live-insertion capability. Use Value: IOFF support prevents backfeeding during card hot-swap; ±24 mA drive sustains signal integrity across 15 cm backplane traces. |
| Automotive Body Control Module | Medical Diagnostic Equipment Data Link |
Use Scenario: Interfacing a 1.8 V CAN controller MCU with 5 V sensor interface ASICs in AEC-Q100 qualified designs. IC Role / Device Role / Timing Role: Robust, automotive-grade transceiver providing bidirectional data path with ESD >2000 V HBM and extended temperature range. Use Value: Qualified to AEC-Q100 Grade 1 (−40 °C to +125 °C); eliminates risk of bus contention during power sequencing mismatches. | Use Scenario: Buffering high-reliability serial data between a 3.3 V ARM processor and legacy 5 V diagnostic peripherals (e.g., ECG front-end ASICs). IC Role / Device Role / Timing Role: Low-noise, low-leakage transceiver ensuring data integrity in safety-critical signal paths with strict EMC requirements. Use Value: Near-zero static current (<10 µA) minimizes self-heating in sealed enclosures; 8 pF CI/O reduces radiated emissions at 10–50 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower max VCC (3.6 V), no 5 V tolerance - requires external clamping for 5 V inputs | Suitable only in pure 3.3 V or lower systems; not viable for 5 V-tolerant mixed-voltage designs | Select when cost is primary and all connected logic remains ≤3.6 V; avoid if interfacing 5 V peripherals |
| 74ALVC245MTCX | Higher speed (tPD = 2.8 ns typ), same 5 V tolerance, but higher ICC (20 µA typical vs. <10 µA) | Better for high-frequency bus arbitration; less optimal for ultra-low-power battery systems | Prefer for timing-critical applications where sub-3 ns propagation outweighs quiescent current penalty |
Compared with SN74LVC245APWR and 74ALVC245MTCX, MC74LCX245MG uniquely balances 5 V tolerance, <10 µA static current, and −55 °C to +125 °C operation - making it optimal for industrial and automotive bus isolation where voltage flexibility and power efficiency are jointly critical.
Availability
MC74LCX245MG is available at Aetrix Electronics and suitable for memory address driving, industrial backplane interconnect, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MC74LCX245MG 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, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74LCX245MG belongs to the LCX low-voltage CMOS logic family, designed specifically for mixed-voltage system interfacing with emphasis on 5 V tolerance, low power, and robustness in harsh environments.
FAQ
What is the maximum supply voltage for MC74LCX245MG?
The MC74LCX245MG supports a DC supply voltage (VCC) up to +5.5 V, with absolute maximum rating of +6.5 V. Operation above 5.5 V is outside recommended conditions and may compromise reliability. The device is rated for continuous operation from 1.65 V to 5.5 V, enabling compatibility with 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains - a key design advantage of the MC74LCX245MG.
Does MC74LCX245MG support live insertion?
Yes, MC74LCX245MG supports live insertion and withdrawal due to its IOFF specification, which guarantees high-impedance I/O states when VCC = 0 V. This prevents back-current flow and bus contention during hot-plug events. The feature is explicitly documented in the datasheet and validated across temperature ranges - a critical capability for the MC74LCX245MG in modular industrial and telecom systems.
What is the output drive strength of MC74LCX245MG at 3.0 V?
At VCC = 3.0 V, the MC74LCX245MG delivers ±24 mA output sink/source current per pin, measured under specified test conditions (IOH = −24 mA, IOL = 24 mA). This balanced drive supports fan-out to multiple LVTTL loads and maintains signal integrity on moderately loaded PCB traces - a confirmed performance metric for the MC74LCX245MG across its full operating temperature range.
Is MC74LCX245MG compatible with 5 V TTL logic inputs?
Yes, MC74LCX245MG has 5 V-tolerant inputs and outputs, meaning it can safely accept 5 V logic signals even when VCC is as low as 1.65 V (e.g., 2.5 V or 3.3 V). The VI absolute maximum rating is +6.5 V, and the datasheet specifies safe operation with 5 V TTL interfaces - a defining feature of the MC74LCX245MG that eliminates external level-shifting components.
What package type is used for MC74LCX245MG?
MC74LCX245MG uses a 20-pin QFN package measuring 2.5 mm × 4.5 mm (case 485AA), with exposed thermal pad, Pb-free finish, and moisture sensitivity level 1. This compact, thermally efficient package is optimized for space-constrained industrial and automotive PCB layouts - the exact mechanical configuration confirmed for the MC74LCX245MG in onsemi's official package drawings and ordering information.
MC74LCX245MG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- 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:
- SOEIAJ-20
MC74LCX245MG FAQ
1.How can I place an order for MC74LCX245MG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX245MG 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 MC74LCX245MG reliable?
The price and inventory of MC74LCX245MG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX245MG is usually 5 days.
3.What payment methods are accepted for MC74LCX245MG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX245MG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74LCX245MG?
MC74LCX245MG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX245MG 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 MC74LCX245MG?
For technical support, including MC74LCX245MG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX245MG requirements.
6.How does Aetrix verify that MC74LCX245MG is sourced from the original manufacturer or authorized distributors?
All MC74LCX245MG 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 MC74LCX245MG meets industry standards.
7.What is the process for return or replacement of MC74LCX245MG?
All MC74LCX245MG units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX245MG, 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 MC74LCX245MG part is unused and in its original packaging.
Return procedure for MC74LCX245MG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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