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onsemi 74LCX245WM
- Part No.:
- 74LCX245WM
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LCX245WM.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,068
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Product details
Overview
74LCX245WM from ON Semiconductor (formerly Fairchild) is a low-voltage bidirectional transceiver IC designed for bus interface between 2.3V–3.6V logic domains and 5V signal environments. It features 8-bit non-inverting data flow, 3-STATE outputs controlled by OE and T/R inputs, 7.0ns max propagation delay at VCC = 3.3V, ±24mA output drive at 3.0V, and 5V-tolerant I/O. It is used in mixed-voltage motherboard data buses and peripheral interconnects.
For engineers reviewing the 74LCX245WM datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional voltage translation capability, 20-pin SOIC package compatibility, 3.3V system integration with legacy 5V peripherals, and high-impedance power-down behavior during live insertion.
Technical Context
The 74LCX245WM implements dual-directional bus buffering using CMOS technology optimized for low-voltage operation while maintaining 5V tolerance on all I/O pins. Its direction control (T/R) and output enable (OE) inputs operate independently to configure data flow path and output state.
It supports live insertion/withdrawal via power-down high-impedance mode when OE is asserted, and includes internal circuitry to suppress noise and EMI. Latch-up performance exceeds 500mA, and ESD robustness meets >2000V HBM and >200V MM standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - Enables direct use in 2.5V and 3.3V systems without level-shifting circuitry. |
| Propagation Delay | 7.0ns max at VCC = 3.3V - Supports high-speed data transfer up to ~140MHz bus timing margin. |
| I/O Voltage Tolerance | 0V to 5.5V - Allows safe interfacing with 5V TTL/CMOS signals without external clamping diodes. |
| Output Drive | ±24mA at VCC = 3.0V - Sufficient to drive standard 50Ω transmission lines or multiple CMOS loads. |
| Quiescent ICC | 10µA max - Minimizes standby power in battery-backed or low-power embedded subsystems. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade operation in harsh ambient environments. |
| Input Leakage | ±5.0µA max - Ensures stable logic levels even with high-impedance pull-ups or floating unused inputs. |
Pinout & Package
74LCX245WM is housed in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide package (M20B). The body dimensions are 12.60mm × 7.60mm × 2.65mm max, with 1.27mm lead pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-low global control: asserts high-impedance on both A and B ports when HIGH. |
| 2–9 (A0–A7) | Side A I/O Terminals | Bidirectional data lines - function as inputs or 3-STATE outputs depending on T/R and OE states. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output current; must be low-inductance connection. |
| 11–18 (B0–B7) | Side B I/O Terminals | Bidirectional data lines - mirror A-side behavior; direction determined by T/R input. |
| 19 (T/R) | Transmit/Receive Control | Direction selector: LOW routes B→A, HIGH routes A→B; valid only when OE is LOW. |
| 20 (VCC) | Power Supply | Single 2.3–3.6V supply for core logic and I/O drivers; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Enables seamless integration between 3.3V microcontrollers and legacy 5V peripherals without external translators. |
| Live insertion support | Guaranteed high-impedance state during power-up/down when OE tied to VCC via pull-up resistor. |
| Low dynamic power | 25pF power dissipation capacitance at 10MHz ensures minimal switching current in high-frequency bus applications. |
| High noise immunity | Proprietary EMI reduction circuitry and 0.7V/2.0V input thresholds provide robust operation in electrically noisy industrial enclosures. |
| Latch-up immunity | Exceeds 500mA per JEDEC JESD78, eliminating risk of destructive latch-up during voltage transients or hot-plug events. |
Applications
| Industrial PLC Backplane Interface | Embedded System Memory Expansion Bus |
|---|---|
Use Scenario: Connecting a 3.3V ARM-based CPU module to a legacy 5V I/O expansion backplane with parallel address/data lines. IC Role / Device Role: Bidirectional voltage-translating bus transceiver enabling data exchange across voltage domains without signal degradation. Use Value: Eliminates need for discrete level shifters or dual-supply buffers, reducing BOM count and PCB area by 30% versus discrete solutions. |
Use Scenario: Extending SRAM or Flash memory bus from a 2.5V SoC to external 3.3V memory modules in portable medical devices. IC Role / Device Role: Direction-controlled bus repeater that isolates memory controller timing from load capacitance of extended traces. Use Value: Maintains signal integrity at 20MHz sustained read/write rates while supporting hot-swap capability during field firmware updates. |
| Automotive Infotainment Display Link | Test Equipment Digital Pattern Generator |
Use Scenario: Interfacing a 3.3V FPGA video controller to a 5V LVDS transmitter IC in an automotive head-unit display subsystem. IC Role / Device Role: Level-shifting transceiver handling bi-directional configuration and status signals between domains. Use Value: Provides ESD-hardened (2000V HBM) and temperature-stable (–40°C to +85°C) operation required for under-dash deployment. |
Use Scenario: Driving multiple DUT (device-under-test) inputs simultaneously from a single pattern generator channel in automated test fixtures. IC Role / Device Role: Fan-out buffer with configurable direction and 3-STATE disable for test vector sequencing and isolation. Use Value: Enables precise timing control with 7ns propagation delay and sub-nanosecond skew, critical for <10ns setup/hold compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower VCC range (1.65–3.6V); 3.6ns tPD at 3.3V; no 5V tolerance on inputs - requires external clamping for 5V signals. | Suitable only in fully 3.3V-only systems; not drop-in for 5V-tolerant designs. | Select when full 5V I/O tolerance is unnecessary and faster propagation is prioritized over mixed-voltage interoperability. |
| 74ALVC245MTCX | Wider VCC range (1.65–3.6V); 2.9ns tPD at 3.3V; 5V-tolerant inputs only (not outputs); higher ICC (20µA). | Accepts 5V inputs but cannot drive 5V loads - limits use to unidirectional or receiver-only roles in mixed-voltage paths. | Choose when cost-sensitive designs require faster speed and partial 5V compatibility, but full bidirectional 5V drive is not needed. |
Compared with SN74LVC245APWR and 74ALVC245MTCX, the 74LCX245WM uniquely delivers full 5V tolerance on both inputs and outputs within its 2.3–3.6V supply range - making it the only option among the three qualified for true bidirectional 5V↔3.3V bus bridging without external protection components.
Availability
74LCX245WM is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded memory expansion buses, automotive infotainment interfaces, and automated test equipment requiring stable component supply across multi-year production cycles.
Supply support for 74LCX245WM 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
ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and sensor solutions for industrial, automotive, and consumer markets.
The 74LCX245WM belongs to the LCX family of low-voltage, high-speed CMOS logic devices engineered specifically for mixed-voltage system interfacing where 5V legacy compatibility and 3.3V/2.5V core logic coexist.
FAQ
What is the maximum operating frequency supported by the 74LCX245WM?
The 74LCX245WM does not specify a maximum clock frequency directly, but its 7.0ns maximum propagation delay at VCC = 3.3V implies usable data rates up to approximately 140MHz for single-cycle bus transfers. Actual achievable frequency depends on trace length, loading, and system timing margins. For reliable operation, designers should validate timing closure using the AC electrical characteristics table in the official 74LCX245WM datasheet.
Can the 74LCX245WM be used with a 2.5V supply voltage?
Yes, the 74LCX245WM is fully specified for operation at 2.5V (within the 2.3V–3.6V VCC range). At VCC = 2.5V, it delivers 8mA output drive, maintains 5V-tolerant I/O, and exhibits 8.4ns max propagation delay with CL = 30pF. All DC and AC parameters in the datasheet include 2.5V operating conditions, confirming robust functionality at this voltage.
Is the 74LCX245WM pin-compatible with other 74-series transceivers like the 74LS245?
No, the 74LCX245WM is not pin-compatible with bipolar 74LS245 due to differing pin assignments - notably, the 74LCX245WM uses pin 1 for OE and pin 19 for T/R, whereas 74LS245 uses pin 1 for GND and pin 19 for VCC. Additionally, the 74LCX245WM operates at lower voltage and has different drive strength and timing. Direct replacement requires PCB layout revision.
Does the 74LCX245WM require external pull-up resistors on OE or T/R inputs?
OE must be pulled up to VCC through a resistor during power-up/down to ensure high-impedance state; minimum value depends on driver strength but typically 4.7kΩ–10kΩ suffices. T/R has no such requirement and may be driven directly from logic outputs. Unused A/B pins must be terminated to VCC or GND - floating inputs are prohibited per datasheet Note 5.
What package type is used for the 74LCX245WM, and is it RoHS-compliant?
The 74LCX245WM uses a 20-lead SOIC package (JEDEC MS-013, 0.300" wide, M20B) with gull-wing leads. It is lead-free and RoHS-compliant per JEDEC J-STD-020B, with matte tin lead finish and halogen-free molding compound. The package drawing identifier is MKT-M20BREV3, and land pattern recommendation is SOIC127P1030X265-20L.
74LCX245WM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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 ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74LCX245WM FAQ
1.How can I place an order for 74LCX245WM through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX245WM 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 74LCX245WM reliable?
The price and inventory of 74LCX245WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX245WM is usually 5 days.
3.What payment methods are accepted for 74LCX245WM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX245WM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX245WM?
74LCX245WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX245WM 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 74LCX245WM?
For technical support, including 74LCX245WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX245WM requirements.
6.How does Aetrix verify that 74LCX245WM is sourced from the original manufacturer or authorized distributors?
All 74LCX245WM 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 74LCX245WM meets industry standards.
7.What is the process for return or replacement of 74LCX245WM?
All 74LCX245WM units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX245WM, 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 74LCX245WM part is unused and in its original packaging.
Return procedure for 74LCX245WM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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