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Texas Instruments SN74LVC4245APWG4
- Part No.:
- SN74LVC4245APWG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC4245APWG4.pdf
- Description:
- IC TRANSLATOR BIDIR 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,676
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Product details
Overview
SN74LVC4245APWG4 from Texas Instruments is an octal 3.3V-to-5V bidirectional bus transceiver with 3-state outputs, VCCA/VCCB dual-supply architecture (5.5V/3.6V max), 24mA drive strength at 3V, and robust power sequencing. It enables asynchronous data exchange between mixed-voltage systems in industrial motor control and power electronics interfaces.
For engineers reviewing the SN74LVC4245APWG4 datasheet, SN74LVC4245APWG4 pinout, SN74LVC4245APWG4 application, or SN74LVC4245APWG4 equivalent, key selection criteria include its dual-rail voltage translation capability, Ioff partial-power-down support, VCC isolation behavior, and compatibility with legacy SN74LVC4245 layouts via pin-compatible data path mapping (pins 2–11 and 14–23).
Technical Context
The SN74LVC4245APWG4 implements a noninverting, direction-controlled transceiver architecture with DIR and OE inputs powered exclusively by VCCA. Its dual-supply design isolates A-port logic (5V-tolerant) from B-port logic (3.3V-only), enabling true bidirectional level shifting without external components.
Glitch-free power sequencing ensures safe operation during asymmetric VCCA/VCCB ramp-up/down, while VCC isolation forces both ports into high-impedance when either supply drops below 100mV or floats. The device supports partial-power-down via Ioff, limiting backflow current to ±2μA per I/O when powered off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Range | 4.5V to 5.5V - powers A-port I/Os and control logic (DIR/OE), enabling direct interface with 5V microcontrollers or legacy buses |
| VCCB Range | 2.7V to 3.6V - powers B-port I/Os only, optimized for 3.3V FPGA, DSP, or ARM-based subsystems |
| Drive Strength | 24mA at 3V - sustains signal integrity across long PCB traces or heavy capacitive loads (e.g., multi-drop bus segments) |
| Propagation Delay | 1ns to 6.7ns - ensures timing compliance in high-speed digital interfaces up to ~100MHz with 50pF load |
| Ioff Leakage | ±2μA max - prevents damaging back-current during hot-swap or partial system shutdown in modular power systems |
| ESD Rating | 2000V HBM - meets industrial IEC 61000-4-2 immunity requirements without external protection diodes |
| Operating Temp | –40°C to +85°C - qualified for use in outdoor power electronics, servo drives, and industrial PLC environments |
Pinout & Package
SN74LVC4245APWG4 uses a 24-pin SOIC (DW) package measuring 15.5mm × 10.3mm, with GND on pins 11, 12, and 13 for low-inductance return paths. Pin functions are validated per TI SCAS375K Rev K (May 2026).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | Power supply for A port and control logic | Must be stable before DIR/OE assertion; powers all A-side I/Os and direction/output-enable circuitry |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A data flow; referenced to VCCA, not VCCB |
| A1–A8 (Pins 3–10) | A-port transceiver I/Os | 5V-tolerant bidirectional data lines; accept 0–5.5V inputs, drive 0–VCCA outputs |
| GND (Pins 11,12,13) | Ground reference | Three dedicated ground pins reduce ground bounce in high-speed switching applications |
| B8–B1 (Pins 14–21) | B-port transceiver I/Os | 3.3V-only bidirectional data lines; operate within 0–VCCB range, require VCCB = 2.7–3.6V |
| OE (Pin 22) | Output enable input | Low = active transceiver; High = all I/Os tri-stated; referenced to VCCA |
| VCCB (Pins 23,24) | Power supply for B port | Dual VCCB pins improve current delivery and reduce IR drop across B-port I/Os |
Key Features
| Feature | Design Value |
|---|---|
| Asymmetric voltage translation | Enables direct interconnection of 5V MCU peripherals with 3.3V FPGAs without external level shifters or resistors |
| VCC isolation | Automatically disables both ports when either VCCA or VCCB falls below 100mV - critical for safe hot-swap in modular UPS or string inverters |
| Ioff partial-power-down | Prevents back-driving of powered-down subsystems in PLC backplanes where only one side of the bus remains active |
| Glitch-free power sequencing | Eliminates false data pulses during staggered power-up of 5V control logic and 3.3V signal processing rails |
| Pin-compatible layout migration | Shares data-path pin mapping (pins 2–11, 14–23) with standard SN74LVC4245, enabling reuse of existing PCB footprints |
Applications
| Industrial Servo Drive Interface | Three-Phase UPS Data Concentrator |
|---|---|
Use Scenario: Isolating 5V microcontroller command signals from 3.3V gate driver ICs in motor power stages. IC Role / Device Role / Timing Role: Bidirectional bus transceiver translating PWM enable, fault feedback, and status registers between voltage domains. Use Value: Eliminates need for discrete level-shifting components while maintaining <6.7ns propagation delay for real-time fault response. |
Use Scenario: Aggregating sensor data and control commands across multiple 3.3V monitoring ICs to a central 5V management MCU in uninterruptible power supplies. IC Role / Device Role / Timing Role: Octal transceiver managing isolated communication bus between battery management units and main controller. Use Value: Supports 24mA drive to overcome trace capacitance in large-format UPS chassis, ensuring reliable data capture at 10MHz+ rates. |
| PLC Analog I/O Module Backplane | Air Conditioner Outdoor Unit Controller |
Use Scenario: Interfacing 3.3V ADC/DAC modules with 5V PLC CPU backplane in distributed control systems. IC Role / Device Role / Timing Role: Direction-controlled transceiver routing configuration registers and sampled data across mixed-voltage backplane slots. Use Value: Ioff and VCC isolation prevent cross-rail leakage during module hot-swap, meeting IEC 61131-2 functional safety requirements. |
Use Scenario: Connecting 3.3V environmental sensors and fan controllers to 5V main system MCU in outdoor HVAC units. IC Role / Device Role / Timing Role: Level-shifting transceiver handling temperature, pressure, and compressor status signals. Use Value: –40°C to +85°C rating and 2000V HBM ESD withstand ensure reliability in uncontrolled ambient conditions without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC4245ZQER | Lower VCCB min (1.2V), higher speed (tPD < 3.5ns), but reduced drive (12mA @ 1.8V) | Better suited for ultra-low-voltage SoC interfaces (1.2V/1.8V), not optimal for 3.3V→5V industrial loads requiring 24mA | Select SN74LVC4245APWG4 when interfacing legacy 5V logic with modern 3.3V peripherals under heavy capacitive loading |
| TXB0108PWR | Auto-direction sensing, single-supply (1.2V–3.6V), no DIR pin; lower drive (4mA @ 3.3V) | Designed for point-to-point I²C/SPI links, not multi-drop bus architectures requiring explicit direction control | Choose SN74LVC4245APWG4 for applications needing deterministic DIR-driven data flow and higher output current in shared-bus topologies |
Compared with SN74AVC4245ZQER and TXB0108PWR, SN74LVC4245APWG4 delivers superior drive strength and deterministic direction control for industrial bus systems, while maintaining backward compatibility with SN74LVC4245 layouts-making it the preferred choice for retrofitting 3.3V/5V interoperability into existing designs.
Availability
SN74LVC4245APWG4 is available at Aetrix Electronics and suitable for industrial servo drives, three-phase UPS systems, and PLC analog I/O modules requiring stable component supply across extended production lifecycles.
Supply support for SN74LVC4245APWG4 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 technologies for industrial, automotive, and communications markets.
SN74LVC4245APWG4 belongs to TI's LVC logic family, engineered specifically for robust voltage translation in mixed-signal industrial control systems where reliability under asymmetric power sequencing and partial-power-down conditions is critical.
FAQ
What is the maximum allowable voltage on the A-port I/O pins of SN74LVC4245APWG4?
The A-port I/O pins of SN74LVC4245APWG4 tolerate up to VCCA + 0.5V, with absolute maximum rating of 6.5V. When VCCA = 5.5V, inputs may safely reach 6.0V - enabling direct connection to 5V TTL or CMOS buses without clamping diodes. This specification is verified per TI SCAS375K Section 5.1.
Does SN74LVC4245APWG4 support hot-swap operation between powered and unpowered voltage domains?
Yes. SN74LVC4245APWG4 supports hot-swap via its VCC isolation feature: if either VCCA or VCCB drops below 100mV or floats, all I/Os enter high-impedance state. Combined with Ioff leakage ≤±2μA, this prevents back-current damage during live insertion of modules in PLC or UPS backplanes.
Can SN74LVC4245APWG4 replace SN74LVC4245 in an existing PCB layout?
Yes - SN74LVC4245APWG4 uses identical SOIC-24 (DW) packaging and shares the same data-path pin mapping (pins 2–11 and 14–23) as SN74LVC4245. No PCB re-layout is required; only VCCB must be added to pins 23/24, and VCCA routed to pin 1 instead of the legacy single-VCC net.
What is the purpose of the dual VCCB pins (23 and 24) on SN74LVC4245APWG4?
The dual VCCB pins on SN74LVC4245APWG4 reduce impedance in the B-port power delivery network, minimizing voltage droop during simultaneous switching of all eight 3.3V I/Os. This improves noise margin and signal integrity in high-current applications like servo drive feedback loops or multi-sensor data concentrators.
How does SN74LVC4245APWG4 handle power supply sequencing during system startup?
SN74LVC4245APWG4 guarantees glitch-free operation regardless of VCCA/VCCB ramp order due to internal power-on reset and isolation circuitry. If VCCA powers up before VCCB, outputs remain high-Z until VCCB stabilizes above 100mV - preventing false logic transitions that could corrupt downstream 3.3V peripherals during boot.
SN74LVC4245APWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- Packaging:
- Tube
- 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-TSSOP (0.173", 4.40mm Width)
SN74LVC4245APWG4 FAQ
1.How can I place an order for SN74LVC4245APWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC4245APWG4 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 SN74LVC4245APWG4 reliable?
The price and inventory of SN74LVC4245APWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC4245APWG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC4245APWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC4245APWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC4245APWG4?
SN74LVC4245APWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC4245APWG4 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 SN74LVC4245APWG4?
For technical support, including SN74LVC4245APWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC4245APWG4 requirements.
6.How does Aetrix verify that SN74LVC4245APWG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC4245APWG4 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 SN74LVC4245APWG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC4245APWG4?
All SN74LVC4245APWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC4245APWG4, 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 SN74LVC4245APWG4 part is unused and in its original packaging.
Return procedure for SN74LVC4245APWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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