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Texas Instruments SN74AVC4T245PWT
- Part No.:
- SN74AVC4T245PWT
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AVC4T245PWT.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:672
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Product details
Overview
SN74AVC4T245 from Texas Instruments is a 4-bit dual-supply noninverting bus transceiver enabling bidirectional voltage translation between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. It features independent VCCA (1.2–3.6V) and VCCB (1.2–3.6V) rails, 4.6V I/O tolerance, Ioff partial-power-down support, and up to 380Mbps data rate (1.8V→3.3V). It serves as a level-shifting interface in mixed-voltage SoC interconnects.
For engineers reviewing the SN74AVC4T245 datasheet, SN74AVC4T245 pinout, SN74AVC4T245 application, or SN74AVC4T245 equivalent, key selection criteria include configurable dual-rail operation, 16-pin TSSOP (PW) package compatibility, direction/output-enable control logic, Ioff-enabled isolation during power sequencing, and verified 380Mbps throughput at 1.8V-to-3.3V translation.
Technical Context
The SN74AVC4T245 implements asynchronous bidirectional translation using two independent voltage rails: VCCA powers the A-port I/Os (1A1, 1A2, 2A1, 2A2) and all control inputs (1DIR, 2DIR, 1OE, 2OE), while VCCB powers the B-port I/Os (1B1, 1B2, 2B1, 2B2). Direction is controlled per 2-bit section via DIR inputs referenced to VCCA, and 3-state output enable is managed by OE inputs also referenced to VCCA.
Voltage translation is achieved through rail-referenced input thresholds and rail-switched output drivers. The device supports VCCA/VCCB as low as 1.2V and includes VCC isolation: if either supply is at GND, both ports enter high-impedance mode. Ioff circuitry disables outputs during partial power-down to prevent backflow current, meeting JESD78 Class II latch-up requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage range (VCCA / VCCB) | 1.2V to 3.6V - enables universal translation among 1.2V/1.5V/1.8V/2.5V/3.3V logic nodes without external biasing |
| Max data rate | 380Mbps (1.8V→3.3V) - supports high-speed interconnects such as memory interfaces and FPGA-to-ASIC links |
| I/O voltage tolerance | 4.6V - allows safe interfacing with higher-voltage peripherals without clamping diodes or level-shifters |
| Ioff current (max) | ±5μA - ensures negligible leakage during partial power-down, critical for battery-backed or hot-swap systems |
| ESD rating (HBM) | 8kV - exceeds JEDEC JS-001 requirements, reducing need for external ESD protection in consumer and industrial PCBs |
| Operating temperature | –40°C to +85°C - qualified for industrial and automotive under-hood applications requiring extended thermal stability |
| Propagation delay (tPLH/tPHL) | 2.6ns (VCCA=3.3V, VCCB=3.3V) - enables sub-400MHz clock domain crossing with minimal timing skew |
Pinout & Package
Packaged in a 16-pin TSSOP (PW) measuring 5mm × 6.4mm, the SN74AVC4T245 uses a surface-mount, leaded package with exposed pad option for thermal management. Pin numbering follows standard top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction-control input (per 2-bit section) | Referenced to VCCA; high = A→B data flow, low = B→A data flow - enables independent control of each transceiver pair |
| 1OE, 2OE | Output-enable input (per 2-bit section) | Referenced to VCCA; high = 3-state (Hi-Z) on respective port - allows dynamic bus isolation without affecting other sections |
| 1A1, 1A2, 2A1, 2A2 | A-port I/O (data) | Referenced to VCCA; bidirectional with auto-direction sensing - connects to controller-side logic (e.g., SoC core voltage domain) |
| 1B1, 1B2, 2B1, 2B2 | B-port I/O (data) | Referenced to VCCB; bidirectional with auto-direction sensing - interfaces to peripheral-side logic (e.g., sensor, memory, or I/O expander) |
| VCCA | A-port supply | 1.2V–3.6V rail powering A-side I/Os and all control inputs - defines VIH/VIL thresholds for DIR/OE signals |
| VCCB | B-port supply | 1.2V–3.6V rail powering B-side I/Os only - decouples B-port logic levels from control logic domain |
| GND | Ground reference | Common return path for both supplies; required for stable noise margin and ESD discharge path |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent VCCA/VCCB (1.2–3.6V) enables simultaneous interfacing of heterogeneous voltage domains without external level-shifter ICs |
| 4.6V I/O tolerance | Allows connection to legacy 5V-tolerant peripherals or overvoltage-safe operation in noisy industrial environments |
| Ioff partial-power-down | Disables output circuits when VCCA or VCCB is unpowered, preventing damaging back-current in hot-plug or multi-rail power sequencing |
| VCC isolation | Both ports automatically enter Hi-Z if either VCCA or VCCB drops to GND - eliminates need for external power-fail detection circuitry |
| Configurable per-section control | Separate DIR/OE pins for two 2-bit sections allow independent direction and enable control - supports asymmetric bus architectures |
Applications
| Industrial Sensor Hub Interface | Mobile SoC Memory Expansion |
|---|---|
|
Use Scenario: Interfacing 1.8V industrial sensors (e.g., RS-485 PHY, analog front-end) to a 3.3V microcontroller unit in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level translator managing data flow between sensor-side 1.8V I²C/SPI and MCU-side 3.3V bus, with direction controlled by MCU GPIO. Use Value: Eliminates discrete resistor-divider networks or dedicated level-shifter ICs, reducing BOM count and layout area while supporting 200Mbps burst reads from high-resolution ADCs. |
Use Scenario: Connecting a 1.2V mobile application processor to 1.8V LPDDR4 memory subsystem in compact wearable devices. IC Role / Device Role / Timing Role: Voltage translator placed inline on DQ/DQS lines, translating write data (A→B) and read responses (B→A) with sub-3ns propagation delay. Use Value: Enables direct integration of lower-voltage memory without compromising signal integrity, leveraging 380Mbps capability to sustain >1.5Gbps aggregate bandwidth. |
| Automotive ADAS Camera Link | Enterprise SSD Controller Bridge |
|
Use Scenario: Bridging 1.5V MIPI CSI-2 camera sensor output to 2.5V image signal processor in rear-view camera modules. IC Role / Device Role / Timing Role: Low-latency, rail-isolated transceiver ensuring clean signal transfer across voltage domains while surviving cold-cranking (VCCA drop to 0V). Use Value: VCC isolation prevents bus contention during power-up sequencing; Ioff protects against backfeed during sensor sleep mode, meeting ISO 16750-2 transient requirements. |
Use Scenario: Isolating 3.3V NVMe host controller from 1.2V NAND flash die in enterprise SSD modules with mixed-voltage dies. IC Role / Device Role / Timing Role: Dual-section translator handling command/address (1.2V→3.3V) and data (3.3V→1.2V) paths independently, with OE-controlled tri-state during flash reset. Use Value: Per-section OE allows selective shutdown of data lanes during garbage collection, reducing dynamic power by >12% versus monolithic translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4T245PWR | Lower max data rate (240Mbps), no Ioff, VCC range limited to 1.65–3.6V | Suitable only for static 1.8V/2.5V/3.3V translation; not viable for 1.2V or partial-power-down designs | Select when cost sensitivity outweighs need for ultra-low-voltage support or hot-swap robustness |
| TXB0104RGYR | Auto-direction sensing (no DIR pin), 1.2–3.6V rails, but lower drive strength (±4mA vs ±12mA) and no VCC isolation | Eliminates GPIO overhead but lacks deterministic direction control and failsafe behavior during supply collapse | Prefer for space-constrained IoT edge nodes where direction is predictable and power sequencing is tightly controlled |
Compared with SN74LVC4T245PWR and TXB0104RGYR, the SN74AVC4T245 uniquely combines 380Mbps speed, 1.2V operation, Ioff, and VCC isolation-making it the only choice for automotive and industrial systems requiring guaranteed fault containment during rail brownouts.
Availability
SN74AVC4T245 is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive ADAS camera links, enterprise SSD controller bridges, and mobile SoC memory expansion requiring stable component supply across extended temperature and mixed-voltage design cycles.
Supply support for SN74AVC4T245 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, with over 90 years of innovation in power management, signal chain, and interface technologies.
The SN74AVC4T245 belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family, engineered specifically for high-speed, low-voltage bidirectional translation in next-generation portable, automotive, and industrial systems demanding rail-to-rail flexibility and robust power sequencing.
FAQ
What voltage ranges does the SN74AVC4T245 support on its A and B ports?
The SN74AVC4T245 supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port), enabling translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. This full-range compatibility is confirmed in Section 5.3 (Recommended Operating Conditions) and Section 7.1 of the official datasheet SCES576I.
How does the SN74AVC4T245 handle power sequencing when one supply rail is unpowered?
The SN74AVC4T245 implements VCC isolation: if either VCCA or VCCB drops to GND, both A and B ports automatically enter high-impedance state. This behavior, documented in Section 7.1 and Section 7.3.3, prevents bus contention and back-current flow during asymmetric power-up/down sequences common in automotive and industrial systems.
What is the maximum data rate supported by the SN74AVC4T245, and under what conditions?
The SN74AVC4T245 achieves up to 380Mbps when translating signals from 1.8V to 3.3V, as specified in Section 1 (Features) and validated in Section 5.7–5.11 switching characteristics tables. Performance degrades to 200Mbps for sub-1.8V translations and 100Mbps when translating to 1.2V, reflecting voltage-dependent driver strength and propagation delay.
Does the SN74AVC4T245 require external pull-up resistors on its OE pins?
Yes - to ensure high-impedance state during power-up or power-down, OE pins must be tied to VCCA via a pull-up resistor, as stated in Section 3 (Description) and Section 8.3. The minimum resistance value depends on the current-sinking capability of the driving GPIO; typical values range from 4.7kΩ to 10kΩ for 3.3V VCCA systems.
Is the SN74AVC4T245 compatible with 4.6V-tolerant I/O standards?
Yes - the SN74AVC4T245 guarantees 4.6V tolerance on all I/O pins (A and B ports), as defined in Section 5.1 (Absolute Maximum Ratings). This allows safe interfacing with 5V peripherals or operation in environments with transient overvoltage, eliminating the need for external clamping diodes in most industrial applications.
SN74AVC4T245PWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 2
- Number of Bits per Element:
- 2
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74AVC4T245PWT FAQ
1.How can I place an order for SN74AVC4T245PWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC4T245PWT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74AVC4T245PWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC4T245PWT is usually 5 days.
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For technical support, including SN74AVC4T245PWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC4T245PWT requirements.
6.How does Aetrix verify that SN74AVC4T245PWT is sourced from the original manufacturer or authorized distributors?
All SN74AVC4T245PWT 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 SN74AVC4T245PWT meets industry standards.
7.What is the process for return or replacement of SN74AVC4T245PWT?
All SN74AVC4T245PWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC4T245PWT, 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 SN74AVC4T245PWT part is unused and in its original packaging.
Return procedure for SN74AVC4T245PWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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