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onsemi 74LVT245WMX
- Part No.:
- 74LVT245WMX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LVT245WMX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,278
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Product details
Overview
74LVT245WMX from ON Semiconductor is a low-voltage octal bidirectional transceiver with 3-STATE inputs/outputs, designed for bus interface between 3.3V logic and 5V TTL systems. It features 20-pin SOIC packaging, ±32mA/64mA output drive capability, and operates across –40°C to +85°C. Used in motherboard I/O expansion and industrial backplane data routing.
For engineers reviewing the 74LVT245WMX datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional bus direction control (T/R), output enable (OE) timing, 3.3V supply compatibility with 5V-tolerant I/O, and SOIC-20 mechanical fit in legacy PCB layouts.
Technical Context
The 74LVT245WMX implements eight non-inverting bidirectional buffers with independent Transmit/Receive (T/R) polarity control and global Output Enable (OE) that places both A and B ports into high-impedance state when asserted HIGH. Direction flow is strictly determined by T/R: active-HIGH enables A→B, active-LOW enables B→A.
It uses advanced BiCMOS fabrication to achieve ABT-class speed (tPLH/tPHL ≤ 3.6 ns at VCC = 3.3V) while maintaining low power dissipation (ICCZ = 0.19 mA in 3-STATE). Input voltage tolerance extends to 5.5V, enabling safe interfacing with 5V peripherals without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 2.7V–3.6V - Ensures stable operation in 3.3V rail systems with ±0.3V margin. |
| Input Voltage Range (VI) | 0–5.5V - Supports direct connection to 5V TTL buses without external clamping. |
| Output Drive (IOL/IOH) | 64mA sink / –32mA source - Drives heavy capacitive loads or multiple CMOS inputs on shared bus lines. |
| Propagation Delay (tPLH/tPHL) | ≤3.6 ns @ CL = 50 pF - Enables reliable 200+ MHz bus operation in high-speed digital backplanes. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control and communications equipment. |
| 3-STATE Disable Time (tPHZ/tPLZ) | ≤6.5 ns - Minimizes bus contention during direction switching in real-time data transfer protocols. |
| Input Capacitance (CIN) | 4 pF - Reduces signal loading on upstream drivers, preserving edge integrity in multi-drop configurations. |
Pinout & Package
74LVT245WMX is housed in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide package (M20B), with standard 1.27 mm pitch and 13.00 mm × 7.60 mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH global disable: forces all A/B ports into high-impedance state to isolate bus segments. |
| 2–9 (A0–A7) | Side A Bidirectional I/O | Connects to local 3.3V domain; functions as input or 3-STATE output depending on T/R state. |
| 10 (GND) | Ground Reference | Common return path for all internal logic and I/O current; requires low-inductance PCB connection. |
| 11–18 (B0–B7) | Side B Bidirectional I/O | Interfaces to 5V-tolerant external bus; supports live insertion/extraction due to power-up/down high-Z behavior. |
| 19 (T/R) | Transmit/Receive Control | Direction selector: HIGH routes A→B, LOW routes B→A; asynchronous with respect to clock. |
| 20 (VCC) | Power Supply | 3.3V nominal supply; decoupling capacitor (0.1 µF) required within 5 mm of pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus interface | Enables single-device replacement of dual unidirectional transceivers, reducing component count and PCB area in space-constrained designs. |
| 5V-tolerant I/O with 3.3V VCC | Eliminates need for external level-shifting circuitry when bridging legacy 5V peripherals to modern low-voltage controllers. |
| Live insertion/extraction support | Allows hot-swap capability in modular backplane systems without risk of bus contention or latch-up during module replacement. |
| Power-up/down high-impedance | Prevents glitch-induced bus corruption during power sequencing, critical for reliable boot and reset behavior in embedded systems. |
| Latch-up immunity >500mA | Ensures robustness against transient overvoltage events and ESD-induced latch-up in industrial environments. |
Applications
| Industrial Backplane Interface | Embedded Controller I/O Expansion |
|---|---|
Use Scenario: Interfacing a 3.3V ARM-based controller to legacy 5V ISA-style peripheral cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing address/data bus arbitration between domains with independent OE and T/R control. Use Value: Eliminates discrete level shifters and reduces BOM cost by 30% while maintaining full 8-bit parallel throughput at 25 MHz. |
Use Scenario: Adding GPIO expansion to an FPGA-based motor control board where FPGA I/O banks operate at 3.3V but sensors require 5V signaling. IC Role / Device Role / Timing Role: Level-translating buffer providing direction-controlled data flow between FPGA and external 5V sensor hub. Use Value: Enables deterministic timing via sub-4ns propagation delay and eliminates timing skew across all 8 channels. |
| Telecom Line Card Data Routing | Test Equipment Signal Conditioning |
Use Scenario: Isolating and routing control signals between 3.3V management MCU and 5V line interface units (LIUs) in carrier-grade access switches. IC Role / Device Role / Timing Role: Bus isolator with fast 3-STATE enable/disable (≤7.1 ns) to prevent metastability during dynamic reconfiguration. Use Value: Guarantees <10 ns bus turnaround time, meeting ITU-T G.703 framing alignment requirements. |
Use Scenario: Buffering and direction-switching test patterns between 3.3V pattern generator and 5V DUT in automated test equipment (ATE) fixtures. IC Role / Device Role / Timing Role: Reconfigurable signal path element supporting both stimulus injection and response capture modes via T/R pin. Use Value: Reduces fixture complexity by replacing two separate unidirectional drivers with one device, cutting fixture wiring by 40%. |
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 drive strength (±24mA), 1.65–3.6V VCC range, no 5V-tolerant inputs - requires external clamping for 5V interfaces. | Suitable only for pure 3.3V↔3.3V or 3.3V↔2.5V translation; not drop-in for 5V-tolerant use cases. | Select when system operates entirely below 3.6V and 5V peripherals are absent. |
| 74LVTH245WMX | Includes bushold inputs (eliminates pull-ups on unused pins); otherwise identical pinout, timing, and electrical specs. | Preferred in high-density layouts where board space prohibits external pull-up resistors on idle data lines. | Choose when unused A/B inputs must be held without external components - same SOIC-20 footprint and PCB layout. |
Compared with SN74LVC245APWR and 74LVTH245WMX, the 74LVT245WMX uniquely balances 5V-tolerant I/O, high drive strength, and industrial temperature range in a legacy-compatible SOIC package - making it the only option among the three qualified for mixed-voltage backplane designs requiring robust 5V interface capability without redesign.
Availability
74LVT245WMX is available at Aetrix Electronics and suitable for industrial backplane interface, embedded controller I/O expansion, telecom line card data routing, and test equipment signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for 74LVT245WMX 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 is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and custom devices for automotive, industrial, cloud computing, and consumer markets.
The 74LVT245WMX belongs to ON Semiconductor's legacy logic portfolio inherited from Fairchild, engineered specifically for voltage-level bridging in mixed-supply digital systems where reliability, bus integrity, and industrial temperature operation are critical.
FAQ
What is the maximum data rate supported by the 74LVT245WMX in a typical bus configuration?
The 74LVT245WMX supports reliable operation up to 200+ MHz in well-terminated, low-capacitance bus environments. Its guaranteed propagation delay of ≤3.6 ns (at CL = 50 pF) and output-to-output skew ≤1.0 ns ensure deterministic timing for high-speed parallel data transfers. Actual achievable data rate depends on PCB layout, termination, and load capacitance - validation with the 74LVT245WMX in the target system is required before final design sign-off.
Does the 74LVT245WMX require external pull-up resistors on unused inputs?
No, the 74LVT245WMX does not include bushold circuitry - unlike the pin-compatible 74LVTH245WMX. Unused inputs must be actively driven HIGH or LOW, or terminated with external pull-up/pull-down resistors to prevent floating states. This is confirmed in the datasheet's "Features" section, which explicitly lists bushold as exclusive to the LVTH variant.
Can the 74LVT245WMX safely interface a 3.3V microcontroller with a 5V EEPROM without additional components?
Yes, the 74LVT245WMX can directly interface a 3.3V microcontroller with a 5V EEPROM because its inputs tolerate up to 5.5V and outputs swing rail-to-rail within the 3.3V domain. The 74LVT245WMX's 5V-tolerant I/O eliminates level shifters, provided the EEPROM's input thresholds align with the 74LVT245WMX's VOH/VOL specifications (e.g., VOH ≥ 2.0V at IOL = 24mA).
What is the thermal performance of the 74LVT245WMX in continuous operation at 85°C ambient?
The 74LVT245WMX is rated for continuous operation from –40°C to +85°C ambient, with junction temperature limits defined by power dissipation and package thermal resistance. At maximum IOL = 64mA per output and full 8-bit activity, typical power dissipation remains below 120 mW - well within the SOIC-20 package's thermal capability. No derating is required at 85°C ambient per the datasheet's Recommended Operating Conditions table.
Is the 74LVT245WMX pin-compatible with the 74LVTH245WMX?
Yes, the 74LVT245WMX and 74LVTH245WMX share identical pinout, package (SOIC-20), and all AC/DC electrical specifications except for input behavior: the LVTH version includes bushold, while the LVT version does not. They are mechanically and electrically interchangeable in PCB layouts, though firmware or hardware must ensure unused inputs on the 74LVT245WMX are properly terminated.
74LVT245WMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74LVT245WMX FAQ
1.How can I place an order for 74LVT245WMX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT245WMX 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 74LVT245WMX reliable?
The price and inventory of 74LVT245WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT245WMX is usually 5 days.
3.What payment methods are accepted for 74LVT245WMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT245WMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT245WMX?
74LVT245WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT245WMX 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 74LVT245WMX?
For technical support, including 74LVT245WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT245WMX requirements.
6.How does Aetrix verify that 74LVT245WMX is sourced from the original manufacturer or authorized distributors?
All 74LVT245WMX 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 74LVT245WMX meets industry standards.
7.What is the process for return or replacement of 74LVT245WMX?
All 74LVT245WMX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT245WMX, 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 74LVT245WMX part is unused and in its original packaging.
Return procedure for 74LVT245WMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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