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Texas Instruments SN74LVC4245APWRG4
- Part No.:
- SN74LVC4245APWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC4245APWRG4.pdf
- Description:
- IC TRANSLATOR BIDIR 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,563
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Product details
Overview
SN74LVC4245APWRG4 from Texas Instruments is an octal 3.3V-to-5V bidirectional bus transceiver with 3-state outputs, VCCA=4.5–5.5V and VCCB=2.7–3.6V supply rails, 24mA drive strength at 3V, glitch-free power sequencing, and VCC isolation for industrial bus interfacing in PLCs and servo drives.
For engineers reviewing the SN74LVC4245APWRG4 datasheet, SN74LVC4245APWRG4 pinout, SN74LVC4245APWRG4 application, or SN74LVC4245APWRG4 equivalent, key selection considerations include dual-rail voltage translation capability, Ioff partial-power-down support, high-impedance isolation during supply disconnect, and compatibility with legacy SN74LVC4245 layouts via shared pin mapping (pins 2–11 & 14–23).
Technical Context
The SN74LVC4245APWRG4 implements asynchronous bidirectional data flow between A (5V) and B (3.3V) buses using DIR-controlled direction and OE-gated 3-state output enable. Control logic (DIR, OE) is powered exclusively by VCCA, ensuring deterministic behavior during mixed-rail power-up sequences.
Its VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB falls below 100mV or floats, preventing backdrive current. The Ioff circuitry limits power-off leakage to ±2μA per port, enabling safe partial-power-down operation in modular systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Range | 4.5V to 5.5V - powers A-port I/O and control logic, enabling direct interface with 5V TTL/CMOS systems |
| VCCB Range | 2.7V to 3.6V - powers B-port I/O, supporting 3.3V LVTTL and low-voltage microcontrollers |
| Drive Strength | 24mA at 3V - sustains signal integrity across longer PCB traces and heavier capacitive loads without external buffers |
| Propagation Delay | 1ns to 6.7ns - ensures sub-7ns timing margins for 100MHz+ data transfer in synchronous bus applications |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including motor drives and outdoor HVAC units |
| Ioff Leakage | ±2μA max - prevents damaging back-current during hot-swap or partial system power-down |
| ESD Rating | 2000V HBM - meets industrial immunity requirements without additional protection circuitry |
Pinout & Package
TSSOP-24 package (PW), 7.8mm × 6.4mm body size, 0.65mm lead pitch, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCCA | 5V-side supply rail - powers A-port I/O and DIR/OE control circuitry |
| 2 | DIR | Direction control input - high = A→B data flow; low = B→A data flow |
| 3–10 | A1–A8 | A-port bidirectional I/O - connects to 5V bus; voltage-tolerant up to 6V |
| 11,12,13 | GND | Ground reference - three dedicated pins minimize ground bounce in high-speed switching |
| 14–21 | B8–B1 | B-port bidirectional I/O - connects to 3.3V bus; voltage-tolerant up to 4.6V |
| 22 | OE | Output enable input - active-low; disables all I/Os into high-impedance state |
| 23,24 | VCCB | 3.3V-side supply rail - powers B-port I/O only; independent of VCCA sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply translation | Enables interoperability between 5V legacy controllers and 3.3V peripherals without level-shifter ICs or resistive networks |
| VCC isolation | Automatically places both A and B ports in high-Z when either VCCA or VCCB drops below 100mV - eliminates need for external supervisor circuits |
| Ioff partial-power-down | Blocks reverse current flow during system sleep or module removal, protecting powered subsystems from backfeed damage |
| Glitch-free sequencing | Allows VCCA and VCCB to power up/down in any order - prevents false data bits or spurious resets on connected devices |
| Pin-compatible layout | Shares data-path pin positions (2–11, 14–23) with standard SN74LVC4245 - enables drop-in upgrade without PCB redesign |
Applications
| PLC & DCS Backplane Interface | Servo Drive Power Stage Control |
|---|---|
|
Use Scenario: Isolating 5V CPU bus from 3.3V FPGA-based motion control logic in modular industrial controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge translating command/status signals between voltage domains while maintaining strict timing alignment. Use Value: Eliminates timing skew from discrete level shifters and reduces board space by consolidating eight channels in one TSSOP-24 package. |
Use Scenario: Interfacing 5V microcontroller PWM outputs to 3.3V gate driver ICs in motor inverter modules. IC Role / Device Role / Timing Role: Direction-controlled transceiver routing real-time fault feedback and enable signals with sub-7ns propagation delay. Use Value: Prevents shoot-through risk during power sequencing via VCC isolation, and supports hot-swap maintenance via Ioff protection. |
| Three-Phase UPS Communication Module | Air Conditioner Outdoor Unit Controller |
|
Use Scenario: Linking 5V master MCU to 3.3V isolated RS-485 transceivers and sensor ADCs in uninterruptible power supplies. IC Role / Device Role / Timing Role: Voltage-translating bus buffer handling UART, SPI, and status lines with simultaneous 3-state control. Use Value: Ensures reliable communication under brownout conditions via glitch-free sequencing and maintains ESD robustness (2000V HBM) in noisy AC environments. |
Use Scenario: Connecting 5V HVAC system controller to 3.3V temperature/humidity sensors and fan drivers in outdoor condenser units. IC Role / Device Role / Timing Role: Bidirectional I/O translator managing sensor readback and actuator commands across voltage domains. Use Value: Enables extended temperature operation (–40°C to +85°C) and withstands thermal cycling without parameter drift or latch-up (exceeds 250mA JESD17). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4245ADBR | SSOP-24 package (8.2mm × 7.8mm); identical electrical specs and pinout | Higher profile and larger footprint - suitable where TSSOP thermal performance is insufficient | Select for improved heat dissipation in high-density layouts or where SSOP is preferred for legacy assembly lines |
| TXB0108PWR | Auto-direction sensing; 1.2V–3.6V and 1.65V–5.5V rails; lower drive (4mA) | No DIR/OE pins - unsuitable for synchronous, controlled-direction protocols like parallel bus handshaking | Choose only for simple push-pull I²C/SPI translation; avoid where explicit direction control or 24mA drive is required |
Compared with SN74LVC4245ADBR, the SN74LVC4245APWRG4 offers smaller footprint and better thermal resistance (RθJA = 100.6°C/W vs 90.7°C/W in DB), while TXB0108PWR lacks deterministic direction control and cannot replace SN74LVC4245APWRG4 in legacy '245-based designs requiring DIR/OE signaling.
Availability
SN74LVC4245APWRG4 is available at Aetrix Electronics and suitable for industrial automation, motor control, and power electronics applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SN74LVC4245APWRG4 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.
The SN74LVC4245APWRG4 belongs to TI's LVC logic family, engineered for robust voltage-level translation in mixed-supply systems where reliability, sequencing tolerance, and interoperability between legacy and modern voltage domains are critical.
FAQ
What voltage rails does the SN74LVC4245APWRG4 support?
The SN74LVC4245APWRG4 supports VCCA = 4.5V to 5.5V for the A port and VCCB = 2.7V to 3.6V for the B port. This allows bidirectional translation between 5V and 3.3V logic domains. Inputs on each port tolerate overvoltage up to 6V (A port) or 4.6V (B port), enhancing system robustness against transient excursions. The SN74LVC4245APWRG4 requires no external biasing or pull-ups to operate within these ranges.
How does the SN74LVC4245APWRG4 handle power supply sequencing?
The SN74LVC4245APWRG4 features glitch-free power supply sequencing: VCCA and VCCB may be powered on or off in any order without causing erroneous output transitions. This prevents false data bits or spurious resets in downstream peripherals. Additionally, its VCC isolation function forces all I/Os into high-impedance if either supply drops below 100mV or floats - a key safety mechanism during hot-swap or brownout events in the SN74LVC4245APWRG4.
Can the SN74LVC4245APWRG4 replace the original SN74LVC4245 in existing designs?
Yes - the SN74LVC4245APWRG4 uses the same pin mapping for data paths (pins 2–11 and 14–23) as the standard SN74LVC4245, enabling direct layout reuse without PCB modification. It retains identical DIR/OE control logic, 3-state behavior, and timing characteristics. The SN74LVC4245APWRG4 adds enhanced features including Ioff, VCC isolation, and tighter ESD ratings, making it a functional and pin-compatible upgrade path.
What is the maximum drive strength of the SN74LVC4245APWRG4?
The SN74LVC4245APWRG4 delivers ±24mA output drive at VCCB = 3V and ±24mA at VCCA = 5V, enabling reliable signal transmission across longer PCB traces and higher capacitive loads (e.g., >50pF). This high drive strength eliminates the need for external buffer stages in industrial backplane and motor control interfaces, directly supporting the SN74LVC4245APWRG4's role in noise-immune, high-reliability systems.
Does the SN74LVC4245APWRG4 support partial-power-down operation?
Yes - the SN74LVC4245APWRG4 integrates Ioff circuitry that limits power-off leakage current to ±2μA per port when either VCCA or VCCB is unpowered. This prevents damaging back-current flow into powered subsystems during standby, maintenance, or modular hot-swap operations. The SN74LVC4245APWRG4 meets JESD78 requirements for partial-power-down functionality, making it suitable for energy-conscious industrial architectures.
SN74LVC4245APWRG4 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-TSSOP (0.173", 4.40mm Width)
SN74LVC4245APWRG4 FAQ
1.How can I place an order for SN74LVC4245APWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC4245APWRG4 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 SN74LVC4245APWRG4 reliable?
The price and inventory of SN74LVC4245APWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC4245APWRG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC4245APWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC4245APWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC4245APWRG4?
SN74LVC4245APWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC4245APWRG4 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 SN74LVC4245APWRG4?
For technical support, including SN74LVC4245APWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC4245APWRG4 requirements.
6.How does Aetrix verify that SN74LVC4245APWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC4245APWRG4 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 SN74LVC4245APWRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC4245APWRG4?
All SN74LVC4245APWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC4245APWRG4, 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 SN74LVC4245APWRG4 part is unused and in its original packaging.
Return procedure for SN74LVC4245APWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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