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Texas Instruments SN74LVC4245ADWRE4
- Part No.:
- SN74LVC4245ADWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC4245ADWRE4.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,408
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Product details
Overview
SN74LVC4245ADWRE4 from Texas Instruments is an octal 3.3V-to-5V bidirectional bus transceiver with 3-state outputs, VCCA/VCCB dual-supply operation (4.5–5.5V / 2.7–3.6V), 24mA drive strength at 3V, glitch-free power sequencing, and VCC isolation. It enables level translation in industrial motor control interfaces and PLC backplanes.
For engineers reviewing the SN74LVC4245ADWRE4 datasheet, SN74LVC4245ADWRE4 pinout, SN74LVC4245ADWRE4 application, or SN74LVC4245ADWRE4 equivalent, key selection criteria include dual-rail voltage tolerance, Ioff partial-power-down support, high-impedance isolation during supply disconnect, and SOIC-24 package compatibility with legacy '245 layouts.
Technical Context
The SN74LVC4245ADWRE4 implements asynchronous bidirectional data flow controlled by DIR and OE inputs referenced to VCCA. Its dual-supply architecture isolates A-port (5V-tolerant) and B-port (3.3V) logic domains while maintaining signal integrity across voltage boundaries.
Glitch-free power sequencing ensures no spurious output transitions when VCCA or VCCB powers up/down in any order. The VCC isolation feature forces both ports into high-impedance if either supply drops below 100mV or floats, preventing backdrive current and bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Range | 4.5V to 5.5V - powers A-port I/O and control logic (DIR/OE), enabling 5V system interfacing |
| VCCB Range | 2.7V to 3.6V - powers B-port I/O, supporting 3.3V microcontrollers and FPGAs |
| Drive Strength | 24mA at 3V - sustains signal integrity on long PCB traces or heavy capacitive loads |
| Propagation Delay | ≤6.7ns (A→B), ≤6.1ns (B→A) - meets timing budgets for high-speed parallel bus interfaces |
| Ioff Leakage | ±2μA max - prevents damaging backflow current during partial power-down in hot-swap systems |
| ESD Rating | 2000V HBM - protects against handling damage in industrial assembly environments |
| Operating Temp | –40°C to +85°C - qualified for use in outdoor power electronics and factory automation equipment |
Pinout & Package
SN74LVC4245ADWRE4 uses a 24-pin SOIC (DW) package measuring 15.5mm × 10.3mm, compatible with standard SOIC-24 footprints and reflow profiles (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | VCCA | 5V-side supply rail - powers A-port I/O and DIR/OE control circuitry |
| 2 | DIR | Direction control input - determines data flow direction (A→B or B→A) |
| 3–10 | A1–A8 | A-port transceiver I/O - connects to 5V bus; tolerant of 5.5V inputs |
| 11, 12, 13 | GND | Ground reference - three dedicated pins minimize ground bounce in high-speed switching |
| 14–21 | B8–B1 | B-port transceiver I/O - connects to 3.3V bus; operates at 2.7–3.6V |
| 22 | OE | Output enable - active-low control disables all I/Os into high-impedance state |
| 23 | VCCB | 3.3V-side supply rail - powers B-port I/O only |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply translation | Enables interoperability between 5V legacy systems and 3.3V modern controllers without external level shifters |
| VCC isolation | Automatically places both ports in high-Z when either VCCA or VCCB falls below 100mV - prevents bus corruption during brownout |
| Ioff partial-power-down | Blocks current flow through powered-off I/Os - essential for hot-plug modular systems like PLC I/O cards |
| Glitch-free sequencing | Eliminates false data pulses during asymmetric power-up/down - avoids unintended peripheral resets in servo drives |
| SOIC-24 pin alignment | Pins 2–11 and 14–23 match conventional '245 layout - allows drop-in replacement without PCB redesign |
Applications
| PLC Backplane Interface | Servo Drive Control Module |
|---|---|
Use Scenario: Interfacing 5V fieldbus master to 3.3V FPGA-based motion controller in modular PLC rack. IC Role / Device Role / Timing Role: Bidirectional data translator synchronizing command/status packets between voltage domains. Use Value: Eliminates need for discrete resistor networks or dedicated level-shifter ICs, reducing BOM count and board area. |
Use Scenario: Isolating 5V position feedback signals from 3.3V PWM gate driver logic in closed-loop servo amplifier. IC Role / Device Role / Timing Role: High-speed, low-latency bus transceiver managing encoder data and fault reporting. Use Value: 6.1ns propagation delay ensures real-time response within 100kHz control loops; Ioff prevents latch-up during power cycling. |
| Three-Phase UPS Monitoring | String Inverter Communication |
Use Scenario: Translating sensor data (voltage/current/temperature) from 3.3V ADCs to 5V microcontroller in battery-backed UPS. IC Role / Device Role / Timing Role: Level-shifting transceiver enabling reliable data acquisition under brownout conditions. Use Value: VCC isolation guarantees clean shutdown when backup battery voltage sags - prevents corrupted telemetry during grid failure. |
Use Scenario: Connecting 3.3V RS-485 transceiver to 5V MCU in photovoltaic string inverter monitoring unit. IC Role / Device Role / Timing Role: Voltage-domain bridge for Modbus RTU communication over industrial bus. Use Value: 24mA drive supports long cable runs; ESD protection (2000V HBM) withstands harsh solar farm EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4245APWRE4 | TSSOP-24 package (7.8mm × 6.4mm); identical electrical specs and pinout | Better thermal performance (RθJA = 100.6°C/W vs 90.7°C/W for SOIC); preferred for space-constrained designs | Select when board area is limited and thermal margin must be maximized. |
| TXB0108PWR | Auto-direction sensing; 1.2V–3.6V and 1.65V–5.5V dual-rail; lower drive (±4mA) | Eliminates DIR pin but lacks VCC isolation and Ioff - unsuitable for hot-swap or brownout-critical systems | Choose only for low-power, non-critical interfaces where direction is predictable and supply sequencing is controlled. |
Compared with SN74LVC4245ADWRE4, SN74LVC4245APWRE4 offers identical functionality in a smaller footprint but slightly higher thermal resistance, while TXB0108PWR trades robustness (no VCC isolation, lower drive) for automatic direction detection - making it inappropriate for industrial power electronics requiring fail-safe isolation.
Availability
SN74LVC4245ADWRE4 is available at Aetrix Electronics and suitable for PLC backplanes, servo drive control modules, and three-phase UPS monitoring requiring stable component supply across extended production lifecycles.
Supply support for SN74LVC4245ADWRE4 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74LVC4245ADWRE4 belongs to TI's LVC logic family, engineered for robust voltage translation in industrial automation systems where reliability under variable supply conditions is critical.
FAQ
What voltage ranges does the SN74LVC4245ADWRE4 support on its A and B ports?
The SN74LVC4245ADWRE4 supports 4.5V to 5.5V on the A port (VCCA) and 2.7V to 3.6V on the B port (VCCB). This allows bidirectional level translation between 5V and 3.3V logic domains. Inputs on the A port tolerate up to 5.5V regardless of VCCA setting, while B-port operation is strictly bounded by VCCB's 2.7–3.6V range. These ranges are validated per TI's recommended operating conditions and absolute maximum ratings.
How does the VCC isolation feature work in the SN74LVC4245ADWRE4?
The SN74LVC4245ADWRE4 enters high-impedance on both ports when either VCCA or VCCB drops below 100mV or is left floating. This prevents backdrive current and bus contention during partial power loss. The feature is implemented via internal detection circuitry tied to each supply rail - no external components are required. It is distinct from Ioff, which addresses leakage during full power-down.
Can the SN74LVC4245ADWRE4 replace a standard SN74LVC245 in an existing SOIC-20 design?
No - the SN74LVC4245ADWRE4 is a 24-pin SOIC device, while the SN74LVC245 is 20-pin. However, its pinout is designed so that pins 2–11 and 14–23 align with the conventional '245 terminal mapping, enabling reuse of the same PCB layout when upgrading from a single-supply transceiver to a dual-rail solution. Board rework is unnecessary if the original design预留 extra pads or uses a 24-pin footprint.
What is the maximum data rate supported by the SN74LVC4245ADWRE4?
The SN74LVC4245ADWRE4 does not specify a maximum clock frequency, but its propagation delay (≤6.7ns A→B, ≤6.1ns B→A) and 50pF load switching characteristics support reliable operation at bus rates up to ~100MHz in point-to-point configurations. Actual throughput depends on trace length, termination, and capacitive loading - TI recommends keeping total load ≤50pF per line for guaranteed timing compliance.
Does the SN74LVC4245ADWRE4 support hot-swap applications?
Yes - the SN74LVC4245ADWRE4 supports hot-swap via two complementary features: Ioff limits power-off leakage to ±2μA, preventing backdrive current when VCC is removed, and VCC isolation forces high-Z on both ports if either supply falls below 100mV. Together, these ensure safe insertion/removal in live backplanes such as modular PLC I/O carriers or distributed UPS monitoring nodes.
SN74LVC4245ADWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Translator Type:
- -
- Channel Type:
- -
- Number of Circuits:
- -
- Channels per Circuit:
- -
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- -
- Data Rate:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC (0.295", 7.50mm Width)
SN74LVC4245ADWRE4 FAQ
1.How can I place an order for SN74LVC4245ADWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC4245ADWRE4 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 SN74LVC4245ADWRE4 reliable?
The price and inventory of SN74LVC4245ADWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC4245ADWRE4 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC4245ADWRE4 transactions.
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4.How is shipping managed for SN74LVC4245ADWRE4?
SN74LVC4245ADWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC4245ADWRE4 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 SN74LVC4245ADWRE4?
For technical support, including SN74LVC4245ADWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC4245ADWRE4 requirements.
6.How does Aetrix verify that SN74LVC4245ADWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC4245ADWRE4 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 SN74LVC4245ADWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC4245ADWRE4?
All SN74LVC4245ADWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC4245ADWRE4, 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 SN74LVC4245ADWRE4 part is unused and in its original packaging.
Return procedure for SN74LVC4245ADWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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