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Texas Instruments SN74LVCC4245ANS
- Part No.:
- SN74LVCC4245ANS
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVCC4245ANS.pdf
- Description:
- IC BUS TRANSCEIVER 8BIT 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:10,370
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Product details
Overview
SN74LVCC4245ANS from Texas Instruments is an octal dual-supply bus transceiver enabling bidirectional voltage-level translation between 5V (A port, VCCA = 4.5–5.5V) and 3.3V/5V (B port, VCCB = 2.7–5.5V), with 24mA drive strength at 3V, 3-state outputs controlled by DIR/OE, and robust glitch-free power sequencing. It serves in industrial motor control interfaces where mixed-voltage bus isolation and high-drive signal integrity are critical.
For engineers reviewing the SN74LVCC4245ANS datasheet, SN74LVCC4245ANS pinout, SN74LVCC4245ANS application, or SN74LVCC4245ANS equivalent, key selection criteria include dual-rail Ioff protection, VCC isolation behavior (<100mV trigger), direction-controlled data flow, and compatibility with legacy SN74LVC4245 layouts in servo drive and UPS systems.
Technical Context
The SN74LVCC4245ANS implements asynchronous, noninverting bidirectional data transfer using separate VCCA (5V domain) and VCCB (configurable 2.7–5.5V domain) rails. Its DIR input selects A→B or B→A direction, while OE (referenced to VCCA) enables/disables all outputs into high-impedance state.
Glitch-free power sequencing ensures safe operation during arbitrary VCCA/VCCB ramp-up/down order, and VCC isolation forces both ports into high-Z if either supply drops below 100mV or floats - a critical feature for partial-power-down in PLC and string inverter applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Range | 4.5V to 5.5V - powers A port and control logic (DIR/OE), ensuring TTL-compatible interface with 5V microcontrollers. |
| VCCB Range | 2.7V to 5.5V - configures B port output voltage level, enabling seamless 3.3V↔5V translation without external level shifters. |
| Drive Strength | ±24mA at 3V VCCB - supports heavy capacitive loads (e.g., long PCB traces in servo drive modules) without signal degradation. |
| Ioff Protection | ±2µA max leakage when VCCA = 0V - prevents backflow current during partial power-down, protecting upstream 5V logic. |
| Propagation Delay | 1ns to 7.4ns (CL = 50pF) - guarantees sub-10ns timing margins for real-time industrial communication buses. |
| Operating Temp | –40°C to +85°C - qualified for outdoor unit environments like air conditioner condenser control boards. |
| ESD Rating | 2000V HBM - meets industrial immunity requirements for field-deployed automation equipment. |
Pinout & Package
SN74LVCC4245ANS is supplied in NS (SOP-24) package, 15.0mm × 7.8mm body size with 1.27mm pitch, suitable for automated SMT assembly in industrial control PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply rail | Powers A-side I/O and DIR/OE control logic; must be stable 4.5–5.5V for correct 5V bus interfacing. |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A; referenced to VCCA, enabling direct connection to 5V MCU GPIO. |
| A1–A8 (Pins 3–10) | A-port bidirectional I/O | Connect to 5V data bus; tolerate up to VCCA+0.5V input, supporting hot-swap-safe interfacing. |
| GND (Pins 11–13) | Ground reference | Three dedicated GND pins minimize ground bounce in high-speed 8-bit parallel transfers. |
| B8–B1 (Pins 14–21) | B-port bidirectional I/O | Interface with 3.3V/5V peripherals; output voltage tracks VCCB, eliminating need for external translators. |
| OE (Pin 22) | Output enable (active-low) | Assert low to enable transceiver; high disables all I/Os into high-Z, isolating A/B buses during reset or fault. |
| NC (Pin 23) | No connect | Internally unconnected; must remain floating or grounded per layout guidelines - no routing required. |
| VCCB (Pin 24) | B-port supply rail | Sets B-port output swing; decoupling near this pin is critical for clean 3.3V translation in noise-sensitive comms modules. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail translation | Enables interoperability between legacy 5V controllers and modern 3.3V peripherals without discrete resistors or additional ICs. |
| VCC isolation | Automatically places both A and B ports in high-impedance state if either VCCA or VCCB falls below 100mV - prevents bus contention during brownout. |
| Glitch-free sequencing | Eliminates false transitions during power-up/down of VCCA and VCCB in any order, avoiding spurious resets in PLC I/O modules. |
| 24mA drive at 3V | Drives 50Ω transmission lines or >100pF loads directly, reducing need for external buffers in servo drive feedback paths. |
| Ioff partial-power-down | Limits back-current to ±2µA when VCCA = 0V, allowing safe hot-insertion into live 5V backplanes. |
Applications
| PLC Digital I/O Module | Servo Drive Power Stage Interface |
|---|---|
|
Use Scenario: Isolating 5V FPGA-based motion controller from 3.3V position encoder and current-sense ADC signals. IC Role / Device Role / Timing Role: Bidirectional level translator managing command (5V→3.3V) and feedback (3.3V→5V) paths with sub-10ns propagation delay. Use Value: Eliminates timing skew between control and feedback loops, maintaining closed-loop stability at 20kHz PWM frequencies. |
Use Scenario: Interfacing 5V microcontroller GPIO to isolated gate drivers and analog front-end ICs operating at 3.3V in motor power stage PCB. IC Role / Device Role / Timing Role: Voltage-translating bus buffer with Ioff and VCC isolation, enabling safe power sequencing during driver enable/disable cycles. Use Value: Prevents latch-up during gate driver power-up by forcing high-Z on B-port until VCCB stabilizes, protecting MOSFETs from shoot-through. |
| String Inverter Communication Hub | Air Conditioner Outdoor Unit Control |
|
Use Scenario: Connecting 5V RS-485 transceiver and microcontroller to 3.3V energy metering IC and temperature sensors in solar inverter junction box. IC Role / Device Role / Timing Role: Dual-supply transceiver handling bidirectional SPI/I²C traffic with configurable VCCB for mixed-voltage sensor networks. Use Value: Reduces BOM count by replacing two single-direction translators, lowering thermal stress in confined outdoor enclosures. |
Use Scenario: Bridging 5V HVAC system controller to 3.3V fan speed regulators, refrigerant pressure sensors, and Wi-Fi module in outdoor condenser unit. IC Role / Device Role / Timing Role: Robust level shifter with –40°C to +85°C rating and 2000V HBM ESD protection for harsh environmental operation. Use Value: Ensures reliable UART/SPI communication despite voltage fluctuations during compressor startup surges and ambient temperature swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4245ANSR | Single-supply (3.3V only); no VCCB configurability; 24mA drive at 3.3V; lacks VCC isolation and glitch-free sequencing. | Suitable only for uniform 3.3V systems; cannot translate 5V↔3.3V without external circuitry. | Select when cost is primary and voltage domains are identical; avoid for mixed-rail designs requiring isolation. |
| TXB0108PWR | Auto-direction sensing; 1.2–3.6V and 1.65–5.5V rails; lower drive (±2mA); no Ioff or VCC isolation. | Used in low-power portable devices; unsuitable for industrial noise/EMI environments due to weaker drive and no HBM rating. | Choose for battery-powered IoT nodes; reject for servo drives or inverters needing 24mA drive and 2000V HBM. |
Compared with SN74LVCC4245ANS, SN74LVC4245ANSR lacks dual-rail flexibility and fails under partial power-down, while TXB0108PWR offers auto-direction but sacrifices industrial-grade drive strength, ESD resilience, and deterministic isolation - making SN74LVCC4245ANS the sole choice for safety-critical, mixed-voltage industrial control.
Availability
SN74LVCC4245ANS is available at Aetrix Electronics and suitable for PLC digital I/O modules, servo drive power stage interfaces, and string inverter communication hubs requiring stable component supply across extended temperature and mixed-voltage conditions.
Supply support for SN74LVCC4245ANS 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, with over 50 years of industrial-grade IC design heritage.
The SN74LVCC4245ANS belongs to TI's LVCC logic family, engineered specifically for robust voltage translation in industrial automation, motor control, and renewable energy systems where reliability under partial power-down and mixed-rail operation is mandatory.
FAQ
What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of SN74LVCC4245ANS?
The SN74LVCC4245ANS supports VCCA from 4.5V to 5.5V and VCCB from 2.7V to 5.5V independently; therefore, the maximum differential is 2.8V (e.g., VCCA = 4.5V, VCCB = 2.7V). Operation remains valid across this full range, provided both supplies meet their respective minimums and are properly decoupled. The device does not require VCCA and VCCB to be equal or within a fixed delta.
Does SN74LVCC4245ANS support hot-swapping or live insertion into a powered system?
Yes, SN74LVCC4245ANS supports hot-swapping via its Ioff protection feature: when VCCA = 0V, input/output leakage is limited to ±2µA, preventing damaging back-current into live 5V buses. However, VCCB must be powered before applying signals to B-port pins to avoid violating absolute maximum ratings on B-side I/Os.
Can SN74LVCC4245ANS replace SN74LVC4245ANSR on the same PCB footprint?
Yes - SN74LVCC4245ANS uses identical NS (SOP-24) packaging and pinout as SN74LVC4245ANSR, enabling drop-in replacement. All signal and power pins (A1–A8, B1–B8, DIR, OE, VCCA, VCCB, GND) align exactly; only the internal dual-rail architecture differs, adding translation capability without layout changes.
What happens to the outputs of SN74LVCC4245ANS when VCCA is powered but VCCB is disconnected?
When VCCB is disconnected (i.e., <100mV or floating) while VCCA is powered, the SN74LVCC4245ANS activates its VCC isolation feature: both A-port and B-port outputs enter high-impedance state regardless of DIR or OE logic levels. This prevents bus contention and protects downstream 3.3V peripherals from undefined voltage states.
Is SN74LVCC4245ANS compatible with 5V-tolerant 3.3V microcontrollers such as STM32H7 series?
Yes - SN74LVCC4245ANS B-port inputs accept voltages up to VCCB + 0.5V, and with VCCB = 3.3V, they tolerate 3.8V inputs. When interfacing with 5V-tolerant STM32H7 GPIOs (rated to 5V), the SN74LVCC4245ANS A-port safely receives 5V signals and translates them to 3.3V levels on the B-port, matching the MCU's input thresholds.
SN74LVCC4245ANS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCC
- Package/Case:
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -
- Supplier Device Package:
- -
SN74LVCC4245ANS FAQ
1.How can I place an order for SN74LVCC4245ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCC4245ANS 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 SN74LVCC4245ANS reliable?
The price and inventory of SN74LVCC4245ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCC4245ANS is usually 5 days.
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SN74LVCC4245ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCC4245ANS 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 SN74LVCC4245ANS?
For technical support, including SN74LVCC4245ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCC4245ANS requirements.
6.How does Aetrix verify that SN74LVCC4245ANS is sourced from the original manufacturer or authorized distributors?
All SN74LVCC4245ANS 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 SN74LVCC4245ANS meets industry standards.
7.What is the process for return or replacement of SN74LVCC4245ANS?
All SN74LVCC4245ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCC4245ANS, 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 SN74LVCC4245ANS part is unused and in its original packaging.
Return procedure for SN74LVCC4245ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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