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Texas Instruments SN74LVC4245APWTG4
- Part No.:
- SN74LVC4245APWTG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC4245APWTG4.pdf
- Description:
- IC TRANSLATOR BIDIR 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,282
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Product details
Overview
SN74LVC4245APWTG4 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), 24mA drive strength at 3V, glitch-free power sequencing, and VCC isolation. It enables level translation in industrial motor control interfaces and PLC backplane interconnects.
For engineers reviewing the SN74LVC4245APWTG4 datasheet, SN74LVC4245APWTG4 pinout, SN74LVC4245APWTG4 application, or SN74LVC4245APWTG4 equivalent, key selection criteria include dual-rail voltage tolerance (VCCA = 4.5–5.5V, VCCB = 2.7–3.6V), Ioff partial-power-down support, high-speed propagation delay (≤6.7ns), and TSSOP-24 package compatibility with legacy '245 layouts.
Technical Context
The SN74LVC4245APWTG4 implements a noninverting, direction-controlled transceiver architecture with DIR and OE inputs powered by VCCA. Its dual-supply design isolates A-port (5V logic) and B-port (3.3V logic) domains while maintaining signal integrity during asynchronous bus communication.
Glitch-free power sequencing ensures safe operation when VCCA and VCCB are powered on/off in any order. The VCC isolation feature forces both ports into high-impedance state if either supply drops below 100mV or floats, preventing backdrive current and system-level faults.
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 direct interface with 5V microcontrollers or FPGAs. |
| VCCB Range | 2.7V to 3.6V - powers B-port I/O, supporting 3.3V systems including ARM-based processors and digital isolators. |
| Drive Strength | 24mA at 3V - sustains signal integrity across long PCB traces or heavy capacitive loads (e.g., multi-drop bus segments). |
| Propagation Delay | ≤6.7ns (tPLH, A→B @ VCCA=5V, VCCB=3V) - meets timing budgets for high-speed industrial serial buses (e.g., Modbus RTU, CAN FD physical layer buffering). |
| Ioff Leakage | ±2μA max - prevents damaging back-current flow during partial power-down, critical for hot-swap-capable PLC modules. |
| ESD Rating | 2000V HBM - protects against handling-induced discharge in factory assembly and field maintenance environments. |
| Operating Temp | –40°C to +85°C - qualified for deployment in outdoor power electronics (e.g., string inverters, HVAC outdoor units). |
Pinout & Package
TSSOP-24 package (7.8mm × 6.4mm), lead-free, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCCA | 5V-side power supply - must be stable before enabling DIR/OE; powers all control circuitry. |
| 2 | DIR | Direction control input - high = A→B data flow; low = B→A; referenced to VCCA voltage. |
| 3–10 | A1–A8 | A-port I/O - connects to 5V bus; supports bidirectional data transfer under DIR control. |
| 11–13 | GND | Ground reference - three dedicated pins minimize ground bounce in high-speed switching. |
| 14–21 | B8–B1 | B-port I/O - connects to 3.3V bus; electrically isolated from A-port via dual-supply architecture. |
| 22 | OE | Output enable - active-low; disables all I/Os to high-impedance, enabling bus arbitration and isolation. |
| 23–24 | VCCB | 3.3V-side power supply - independent of VCCA; enables true level-shifting without shared rail constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply translation | Enables interoperability between legacy 5V controllers and modern 3.3V peripherals without external level shifters or resistive networks. |
| VCC isolation | Automatically places both ports in high-Z when either VCCA or VCCB falls below 100mV - eliminates need for external power-fail detection circuitry. |
| Ioff partial-power-down | Blocks reverse current flow during system sleep or hot-swap events, protecting powered-down subsystems from backfeeding. |
| Glitch-free sequencing | Allows VCCA and VCCB to power up/down in any order - removes strict sequencing requirements in complex multi-rail industrial power supplies. |
| Pin-compatible layout | Pins 2–11 and 14–23 align with standard 20-pin '245 devices - enables drop-in upgrade from SN74LVC4245 without PCB redesign. |
Applications
| PLC Backplane Interface | Three-Phase UPS Control |
|---|---|
|
Use Scenario: Interfacing 5V FPGA-based motion controller with 3.3V I/O expansion modules over a 20cm backplane trace. IC Role / Device Role / Timing Role: Bidirectional level translator and bus driver - routes command/status data between voltage domains while maintaining setup/hold timing margins. Use Value: 24mA drive strength compensates for 15pF/cm trace capacitance; 6.7ns tPLH ensures <10% timing budget consumption at 25MHz bus clock. |
Use Scenario: Isolating digital control signals between 5V gate driver ICs and 3.3V DSP-based PWM generator in a 30kVA uninterruptible power supply. IC Role / Device Role / Timing Role: Voltage-level translator with fail-safe isolation - prevents latch-up during VCCB brownout events in auxiliary power rails. Use Value: VCC isolation triggers automatic high-Z on both ports when VCCB drops below 100mV, avoiding false triggering of IGBT gate drivers. |
| Servo Drive Power Stage | String Inverter Communication |
|
Use Scenario: Transmitting position feedback and fault status between 3.3V encoder interface ASIC and 5V main controller in a servo amplifier module. IC Role / Device Role / Timing Role: Direction-controlled transceiver - forwards quadrature encoder pulses (B→A) and receives torque commands (A→B) over shared differential pair. Use Value: Ioff support allows encoder ASIC to enter low-power mode while main controller remains active, reducing system standby current by 3.2mA. |
Use Scenario: Bridging RS-485 transceiver (3.3V logic) and microcontroller (5V I/O) in photovoltaic string monitoring unit operating at –25°C to +70°C ambient. IC Role / Device Role / Timing Role: Logic-level translator and bus buffer - conditions UART signals for noise-immune transmission across 10m cable runs. Use Value: –40°C to +85°C rating ensures reliable startup at sub-zero temperatures; 2000V HBM ESD withstands field service electrostatic events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC4T245RTER | Quad-channel (4-bit), lower drive (12mA), single VCC supply (1.2V–3.6V), no VCC isolation | Better suited for space-constrained portable designs; lacks dual-supply robustness for industrial power cycling | Select when board area is critical and only 4-bit translation is needed; avoid where VCC sequencing independence is required. |
| TXS0108EPRJR | Octal auto-direction sensing, 1.65V–3.6V/2.3V–5.5V range, 20mA drive, no Ioff, higher quiescent current (20μA vs 18μA) | Eliminates DIR pin but adds propagation delay uncertainty due to direction detection latency | Prefer for simple point-to-point links without strict timing control; not recommended for deterministic real-time control loops. |
Compared with SN74AVC4T245RTER and TXS0108EPRJR, the SN74LVC4245APWTG4 provides deterministic direction control, superior drive strength for industrial loads, and hardware-enforced VCC isolation - making it optimal for safety-critical, high-reliability bus interfacing where timing predictability and power-rail fault resilience are mandatory.
Availability
SN74LVC4245APWTG4 is available at Aetrix Electronics and suitable for industrial automation, renewable energy inverters, and motor control systems requiring stable component supply across extended product lifecycles.
Supply support for SN74LVC4245APWTG4 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 SN74LVC4245APWTG4 belongs to TI's LVC logic family, engineered for robust voltage translation and bus interfacing in harsh industrial environments where reliability, wide temperature operation, and power sequencing resilience are essential.
FAQ
What is the maximum allowable voltage on the B-port inputs of SN74LVC4245APWTG4?
The B-port inputs of SN74LVC4245APWTG4 tolerate up to VCCB + 0.5V, with absolute maximum rating of 4.6V. This allows safe interfacing with 3.3V systems even under transient overvoltage conditions, provided VCCB remains within 2.7V–3.6V. Exceeding this limit risks permanent damage per JESD78 latch-up specifications.
Does SN74LVC4245APWTG4 support hot-swap operation?
Yes, SN74LVC4245APWTG4 supports hot-swap operation through its Ioff and VCC isolation features. When VCCB is disconnected or drops below 100mV, both A- and B-port I/Os enter high-impedance state, preventing back-current flow into a powered-down subsystem. This behavior is verified across –40°C to +85°C and eliminates need for external hot-swap controllers.
Can SN74LVC4245APWTG4 translate from 5V to 3.3V and vice versa simultaneously?
No - SN74LVC4245APWTG4 performs unidirectional translation per transaction, controlled by the DIR pin. When DIR = HIGH, data flows A→B (5V→3.3V); when DIR = LOW, data flows B→A (3.3V→5V). Simultaneous bidirectional translation requires two separate devices or a different architecture such as the TXB0108.
What is the thermal resistance (RθJA) of SN74LVC4245APWTG4 in its TSSOP-24 package?
The SN74LVC4245APWTG4 in PW (TSSOP-24) package has a junction-to-ambient thermal resistance (RθJA) of 100.6°C/W, measured under JEDEC JESD51-2 conditions. This value assumes standard 2-layer PCB with 1in² copper pad; actual performance improves with enhanced thermal vias and internal ground/power planes.
Is SN74LVC4245APWTG4 pin-compatible with the standard SN74LVC4245?
Yes - SN74LVC4245APWTG4 uses pins 2–11 and 14–23 identically to the 20-pin SN74LVC4245, enabling mechanical and layout compatibility. The additional VCCB (pin 23/24) and GND (pin 11/12/13) pins accommodate dual-supply operation without requiring PCB rework, as confirmed in TI's Application Report SCAS375K Section 8.1.
SN74LVC4245APWTG4 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)
SN74LVC4245APWTG4 FAQ
1.How can I place an order for SN74LVC4245APWTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC4245APWTG4 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 SN74LVC4245APWTG4 reliable?
The price and inventory of SN74LVC4245APWTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC4245APWTG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC4245APWTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC4245APWTG4 transactions.
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4.How is shipping managed for SN74LVC4245APWTG4?
SN74LVC4245APWTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC4245APWTG4 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 SN74LVC4245APWTG4?
For technical support, including SN74LVC4245APWTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC4245APWTG4 requirements.
6.How does Aetrix verify that SN74LVC4245APWTG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC4245APWTG4 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 SN74LVC4245APWTG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC4245APWTG4?
All SN74LVC4245APWTG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC4245APWTG4, 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 SN74LVC4245APWTG4 part is unused and in its original packaging.
Return procedure for SN74LVC4245APWTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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