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onsemi 74LVT245WM
- Part No.:
- 74LVT245WM
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LVT245WM.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,084
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Product details
Overview
74LVT245WM from ON Semiconductor is a low-voltage octal bidirectional transceiver with 3-STATE inputs/outputs, designed for bus-oriented applications between 3.3V and 5V systems. It features 20-pin SOIC (JEDEC MS-013) packaging, ±32mA/64mA output drive capability, and operates across –40°C to +85°C. Its T/R control pin enables direction selection, while OE disables both A and B ports into high-impedance state - used in memory expansion interfaces and mixed-voltage microcontroller buses.
For engineers reviewing the 74LVT245WM datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional 3.3V-to-5V level translation, 3-STATE bus isolation timing (tPZH ≤ 7.1 ns), bushold-free input behavior, and SOIC-20 mechanical compatibility with legacy LVT logic families.
Technical Context
The 74LVT245WM implements eight non-inverting bidirectional buffers with independent Transmit/Receive (T/R) control and Output Enable (OE) logic. Direction flow is determined solely by T/R: active-HIGH enables A→B data transfer; active-LOW enables B→A. OE HIGH forces both A and B ports into high-impedance, decoupling the bus without glitches during power-up/down.
It uses advanced BiCMOS technology to achieve ABT-class speed at 3.3V supply while maintaining TTL-compatible input thresholds (VIH = 2.0V min, VIL = 0.8V max) and 5V-tolerant I/O (VI up to 7.0V). Unlike the LVTH245 variant, it lacks bushold circuitry - requiring external pull-up/pull-down on unused inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - ensures stable operation in 3.3V systems with ±10% rail tolerance. |
| IOH / IOL | –32mA / +64mA - supports driving heavy capacitive loads and multiple TTL inputs on shared buses. |
| tPLH / tPHL | 1.2ns to 4.0ns - guarantees sub-5ns propagation delay for high-speed address/data bus buffering. |
| VIH / VIL | 2.0V / 0.8V - enables reliable interfacing with 5V CMOS/TTL outputs while powered from 3.3V. |
| VI Absolute Max | –0.5V to +7.0V - allows safe connection to 5V signals without level-shifting circuitry. |
| ICCZ (3-STATE) | 0.19mA - minimizes quiescent current when transceiver is disabled, critical for low-power standby modes. |
| ESD HBM | >2000V - provides robust handling during board assembly and field service without additional protection. |
Pinout & Package
74LVT245WM is housed in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide package (M20B), with standard 1.27mm pitch and gull-wing leads. Pin 1 is marked by a notch or dot; device is lead-free per JEDEC J-STD-020B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH control: asserts high-impedance on both A and B ports simultaneously. |
| 2–9 (A0–A7) | Side A I/O Terminals | Bidirectional data lines connected to local 3.3V bus; internally buffered with 3-STATE drivers. |
| 10 (GND) | Ground Reference | Primary ground return path for all internal logic and output drivers. |
| 11–18 (B0–B7) | Side B I/O Terminals | Bidirectional data lines connected to external 5V bus; tolerate 5V inputs while sourcing/sinking at 3.3V levels. |
| 19 (T/R) | Transmit/Receive Control | Active-HIGH selects A→B direction; active-LOW selects B→A - no internal latching. |
| 20 (VCC) | Supply Voltage | 3.3V nominal supply; must be decoupled locally with 0.1µF ceramic capacitor near pin 20. |
Key Features
| Feature | Design Value |
|---|---|
| 3.3V/5V Mixed-Voltage Interface | Enables direct connection between 3.3V microcontrollers and legacy 5V peripherals without external level shifters. |
| Glitch-Free Power Sequencing | Power-up/down high-impedance behavior prevents bus contention during system reset or brown-out conditions. |
| Live Insertion Support | Allows hot-plug replacement in backplane or modular systems without disrupting adjacent bus operation. |
| High Drive Strength | 64mA sink capability supports fan-out to ≥10 standard TTL loads, reducing need for buffer staging. |
| Latch-Up Immunity | Exceeds 500mA latch-up immunity per JEDEC JESD78, ensuring reliability in noisy industrial environments. |
Applications
| Memory Expansion Interface | Microcontroller Bus Bridge |
|---|---|
|
Use Scenario: Interfacing a 3.3V ARM Cortex-M4 MCU with a 5V SRAM module on a shared data/address bus. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing direction-controlled data flow between CPU and memory, synchronized to WR/RD strobes. Use Value: Eliminates discrete level shifters and reduces PCB layer count by enabling direct 3.3V↔5V signal translation with <4ns propagation delay. |
Use Scenario: Connecting a 3.3V FPGA configuration interface to legacy 5V peripheral controllers (e.g., UART, SPI flash). IC Role / Device Role / Timing Role: Level-translating transceiver isolating FPGA I/O banks from 5V logic domains during configuration and runtime. Use Value: Prevents damage from 5V overvoltage on FPGA pins while maintaining full-speed bidirectional communication at 25MHz clock rates. |
| Industrial Backplane Data Link | Test Equipment Signal Routing |
|
Use Scenario: Bidirectional data routing across a 20-slot Eurocard backplane where modules operate at mixed 3.3V/5V supplies. IC Role / Device Role / Timing Role: Hot-swappable bus transceiver providing direction-controlled data coupling between slot-specific buses. Use Value: Supports live insertion/extraction of cards without bus lockup, leveraging high-impedance disable and ESD-hardened I/O. |
Use Scenario: Automated test equipment (ATE) switching digital stimulus/response paths between DUT and instrument channels. IC Role / Device Role / Timing Role: Reconfigurable signal path controller using OE and T/R to route test vectors bidirectionally through shared probe cabling. Use Value: Reduces relay count and switching latency by replacing electromechanical relays with sub-5ns solid-state bus gating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVTH245WM | Includes bushold inputs; eliminates need for external pull-ups on unused A/B pins. | Preferred in systems with floating or intermittently driven I/O lines where input stability is critical. | Select when input noise immunity and reduced external components outweigh minor cost increase. |
| SN74LVC245APWR | Lower drive (±24mA), 1.65–3.6V VCC range, no 5V-tolerant inputs - requires external level shifting for 5V interfaces. | Suitable only for pure 3.3V or dual-supply 3.3V/2.5V systems; not drop-in compatible for 5V-tolerant use cases. | Choose only if interfacing exclusively with 3.3V logic and lower power consumption is prioritized over 5V compatibility. |
Compared with 74LVT245WM, the 74LVTH245WM adds bushold for input stability but shares identical timing, drive strength, and 5V-tolerance; the SN74LVC245APWR offers lower power and smaller TSSOP packaging but sacrifices 5V interface capability and drive performance - making it unsuitable for mixed-voltage bus bridging.
Availability
74LVT245WM is available at Aetrix Electronics and suitable for memory expansion interfaces, microcontroller bus bridges, industrial backplane data links, and automated test equipment signal routing requiring stable component supply and long-term industrial lifecycle support.
Supply support for 74LVT245WM 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, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.
The 74LVT245WM belongs to ON Semiconductor's legacy LVT logic family - engineered for high-speed, low-voltage bidirectional bus interfacing in mixed-signal systems where 3.3V logic must interoperate with 5V legacy peripherals.
FAQ
What is the maximum operating temperature range for the 74LVT245WM?
The 74LVT245WM is rated for free-air operating temperatures from –40°C to +85°C, making it suitable for industrial-grade applications including factory automation controllers and outdoor communications equipment. This range is validated across all electrical parameters in the datasheet, including propagation delay, output drive, and leakage current specifications.
Does the 74LVT245WM support 5V-tolerant inputs while operating at 3.3V supply?
Yes, the 74LVT245WM supports DC input voltages up to +7.0V regardless of VCC level, enabling direct connection to 5V logic outputs without external clamping or level-shifting circuitry. This 5V tolerance applies to all A and B port pins, as well as OE and T/R control inputs - confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables.
How does the 74LVT245WM differ from the 74LVTH245WM variant?
The 74LVT245WM lacks bushold circuitry on its data inputs, requiring external pull-up or pull-down resistors on unused A/B pins to prevent floating states. In contrast, the 74LVTH245WM integrates bushold inputs that actively retain the last valid logic state, eliminating external biasing components - otherwise, both share identical pinout, timing, drive strength, and 5V-tolerance specifications.
What is the typical propagation delay of the 74LVT245WM at 3.3V supply?
At VCC = 3.3V ± 0.3V and CL = 50 pF, the 74LVT245WM exhibits guaranteed maximum propagation delays of 3.6 ns (tPLH) and 3.5 ns (tPHL) across the full operating temperature range (–40°C to +85°C). These values are measured under standard load conditions and reflect worst-case performance for timing-critical bus designs.
Is the 74LVT245WM pin-compatible with older 74-series transceivers like the 74LS245?
No, the 74LVT245WM is not pin-compatible with the 74LS245 due to differing pin assignments: OE is on pin 1 (not pin 19), and T/R is on pin 19 (not pin 1). While both are 20-pin SOIC devices with identical footprint dimensions, their functional pin mapping differs - requiring PCB layout revision for replacement. The 74LVT245WM follows LVT-family pinout conventions, not LS-family.
74LVT245WM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 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
74LVT245WM FAQ
1.How can I place an order for 74LVT245WM through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT245WM 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 74LVT245WM reliable?
The price and inventory of 74LVT245WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT245WM is usually 5 days.
3.What payment methods are accepted for 74LVT245WM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT245WM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT245WM?
74LVT245WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT245WM 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 74LVT245WM?
For technical support, including 74LVT245WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT245WM requirements.
6.How does Aetrix verify that 74LVT245WM is sourced from the original manufacturer or authorized distributors?
All 74LVT245WM 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 74LVT245WM meets industry standards.
7.What is the process for return or replacement of 74LVT245WM?
All 74LVT245WM units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT245WM, 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 74LVT245WM part is unused and in its original packaging.
Return procedure for 74LVT245WM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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