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Texas Instruments SN74AVC4T245DT
- Part No.:
- SN74AVC4T245DT
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AVC4T245DT.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,153
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Product details
Overview
SN74AVC4T245 from Texas Instruments is a 4-bit dual-supply noninverting bus transceiver enabling bidirectional voltage-level 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 is used in mixed-voltage system interconnects such as SoC-to-peripheral interfaces.
For engineers reviewing the SN74AVC4T245 datasheet, SN74AVC4T245 pinout, SN74AVC4T245 application, or SN74AVC4T245 equivalent, key selection considerations include configurable dual-rail operation, direction-control per channel, 3-state output enable timing, Ioff-enabled isolation during power sequencing, and thermal performance across SOIC, TSSOP, TVSOP, WQFN, UQFN, and SOT packages.
Technical Context
The SN74AVC4T245 implements two independent 2-bit bidirectional channels, each with dedicated DIR and OE controls referenced to VCCA. Its dual-rail architecture decouples A-port (VCCA-referenced) and B-port (VCCB-referenced) logic thresholds, enabling true asynchronous translation without clock domain alignment.
Each channel operates in three functional states: A→B (DIR=H, OE=L), B→A (DIR=L, OE=L), or high-impedance isolation (OE=H). The Ioff circuit disables outputs when either VCCA or VCCB = 0V, preventing backflow current, while VCC isolation forces both ports into high-Z if either supply is at GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage range (VCCA/VCCB) | 1.2V to 3.6V - supports interoperability across all common low-voltage logic families without external level-shifting components. |
| Max data rate | 380Mbps (1.8V→3.3V) - enables high-speed interface bridging for USB, PCIe auxiliary, or memory subsystem links. |
| I/O tolerance | 4.6V - allows safe connection to 3.3V or 5V legacy systems without clamping diodes or series resistors. |
| Ioff current | ±1μA max - ensures negligible leakage during partial power-down, critical for battery-backed or hot-swap applications. |
| ESD rating (HBM) | 8kV - meets industrial-grade robustness requirements for board-level handling and field deployment. |
| Propagation delay | 2.6ns min (VCCA=3.3V, VCCB=2.5V) - supports sub-400MHz signal integrity in synchronous data paths. |
| Operating temperature | –40°C to +85°C - qualified for extended industrial and automotive under-hood environments. |
Pinout & Package
SN74AVC4T245 is available in multiple 16-pin packages including SOIC (D), TVSOP (DGV), TSSOP (PW), WQFN (RGY, BQB), UQFN (RSV), and SOT (DYY). All variants share identical pin numbering and function mapping per TI SCES576I Rev. FEBRUARY 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per channel) | Referenced to VCCA; determines data flow direction: HIGH = A→B, LOW = B→A. |
| 1OE, 2OE | Output-enable input (per channel) | Referenced to VCCA; LOW enables outputs, HIGH places A/B ports in high-impedance state. |
| 1A1–2A2 | A-port I/O (4 pins) | Referenced to VCCA; bidirectional data lines for first and second 2-bit channels. |
| 1B1–2B2 | B-port I/O (4 pins) | Referenced to VCCB; bidirectional data lines for corresponding B-side channels. |
| VCCA, VCCB | Power supply inputs | Independent rails: VCCA powers A-port and control logic; VCCB powers B-port only. |
| GND | Ground reference | Two dedicated GND pins (pins 8 & 9 in D/DGV/PW; pins 10 & 11 in RSV) ensure low-noise return paths. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Enables simultaneous 1.2V↔3.3V, 1.8V↔2.5V, or any combination within 1.2–3.6V range without external biasing. |
| Per-channel direction & enable control | Allows independent configuration of two 2-bit lanes - e.g., one lane A→B for command, other B→A for status - reducing system-level glue logic. |
| Ioff and VCC isolation | Prevents backfeed current and forces high-Z on both ports if either VCCA or VCCB is unpowered - essential for safe hot-plug and power sequencing. |
| 4.6V-tolerant I/Os | Eliminates need for external protection when interfacing with 3.3V or 5V peripherals, simplifying PCB layout and BOM. |
| Low dynamic power consumption | CpdA/CpdB ≤15pF per transceiver - minimizes switching noise and reduces power supply filtering requirements in high-density designs. |
Applications
| Industrial PLC I/O Modules | Automotive ADAS Sensor Interfaces |
|---|---|
Use Scenario: Interfacing 1.8V FPGA-based motion controllers with 3.3V analog I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing command/status exchange between FPGA and isolated ADC/DAC modules. Use Value: Eliminates discrete level-shifters and reduces board area by 40% while supporting 200Mbps real-time sensor feedback loops. | Use Scenario: Connecting 1.2V image signal processor (ISP) to 2.5V radar preprocessing unit in camera-radar fusion ECUs. IC Role / Device Role / Timing Role: Dual-rail transceiver enabling synchronized pixel data transfer and control signaling across voltage domains. Use Value: Maintains <2.8ns propagation skew across all 4 data lines, preserving timing margins required for MIPI CSI-2–compatible parallel video streams. |
| Enterprise SSD Controller Bridges | 5G Baseband Radio Front-End |
Use Scenario: Level-shifting between 1.5V NVMe controller and 3.3V PCIe switch management interface in enterprise solid-state drives. IC Role / Device Role / Timing Role: Configurable bus transceiver handling sideband communication (SMBus, GPIO) with independent power domains. Use Value: Ioff support prevents current leakage during controller sleep states, extending idle power efficiency by >15% versus standard translators. | Use Scenario: Translating 1.8V digital baseband signals to 3.3V RF front-end control lines (PA bias, LNA enable, antenna switch) in mmWave radio units. IC Role / Device Role / Timing Role: High-speed bidirectional translator ensuring glitch-free activation of RF components during beamforming sequence transitions. Use Value: 380Mbps capability exceeds required 300Mbps control bandwidth, providing 25% timing margin for worst-case voltage droop scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4T245 | 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 systems without power sequencing requirements. | Select SN74LVC4T245 only when cost sensitivity outweighs need for partial-power-down safety and ultra-low-voltage (1.2V) compatibility. |
| TXB0104 | Auto-direction sensing (no DIR pin), lower drive strength (±4mA), no 4.6V I/O tolerance. | Best for simple push-pull data buses where direction is inherently unidirectional or detectable from data flow. | Choose TXB0104 for space-constrained designs needing automatic direction control, but avoid in mixed-voltage systems requiring 4.6V tolerance or precise timing control. |
Compared with SN74LVC4T245 and TXB0104, the SN74AVC4T245 uniquely combines 1.2V operation, 4.6V I/O tolerance, per-channel DIR/OE control, and Ioff - making it the only option qualified for dynamic, multi-rail industrial and automotive power-sequenced systems.
Availability
SN74AVC4T245 is available at Aetrix Electronics and suitable for industrial automation, automotive ADAS, enterprise storage, and 5G infrastructure applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing across all package variants (SOIC, TSSOP, TVSOP, WQFN, UQFN, SOT).
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 delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and enterprise markets.
The SN74AVC4T245 belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family, engineered specifically for robust, high-speed bidirectional voltage translation in power-sequenced, mixed-voltage embedded systems.
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 pair of standard low-voltage logic nodes - including 1.2V↔1.5V, 1.8V↔2.5V, and 1.8V↔3.3V. This full-range compatibility is confirmed in TI's SCES576I datasheet Section 5.3 Recommended Operating Conditions.
How does the SN74AVC4T245 handle power sequencing when VCCA and VCCB ramp at different times?
The SN74AVC4T245 uses Ioff and VCC isolation to safely manage asymmetric power-up: if either VCCA or VCCB is at GND, both A and B ports enter high-impedance mode, preventing back-current. OE must be tied to VCCA via a pullup resistor to ensure high-Z during ramp-up. This behavior is explicitly defined in Section 7.4 and Figure 4-1 of the SN74AVC4T245 datasheet.
Can the SN74AVC4T245 translate signals from 3.3V to 1.2V, and what is the maximum supported data rate in that configuration?
Yes, the SN74AVC4T245 supports 3.3V→1.2V translation, with a maximum data rate of 100Mbps per TI SCES576I Section 1 Features. This is verified in Table 5.11 Switching Characteristics (VCCA = 3.3V) where tPLH/tPHL remain valid down to VCCB = 1.2V, and the device maintains VOH/VOL specifications across the full voltage range.
What is the purpose of the separate DIR and OE pins for each 2-bit channel in the SN74AVC4T245?
The SN74AVC4T245 provides independent 1DIR/1OE and 2DIR/2OE pins to allow asymmetric operation: one 2-bit channel can transmit A→B while the other transmits B→A simultaneously, or one can be enabled while the other remains isolated. This eliminates need for external multiplexing and is documented in Table 7-1 Function Table and Section 7.4 Device Functional Modes.
Is the SN74AVC4T245 compatible with 5V-tolerant systems, and how is this achieved?
Yes - the SN74AVC4T245 I/Os are rated for 4.6V absolute maximum, allowing direct connection to 3.3V or 5V systems when used with current-limiting series resistors. This tolerance is specified in Section 5.1 Absolute Maximum Ratings and validated by JESD78 latch-up testing (>100mA), making it suitable for legacy interface bridging without additional protection circuitry.
SN74AVC4T245DT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-SOIC
SN74AVC4T245DT FAQ
1.How can I place an order for SN74AVC4T245DT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC4T245DT 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 SN74AVC4T245DT reliable?
The price and inventory of SN74AVC4T245DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC4T245DT is usually 5 days.
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Once your SN74AVC4T245DT 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 SN74AVC4T245DT?
For technical support, including SN74AVC4T245DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC4T245DT requirements.
6.How does Aetrix verify that SN74AVC4T245DT is sourced from the original manufacturer or authorized distributors?
All SN74AVC4T245DT 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 SN74AVC4T245DT meets industry standards.
7.What is the process for return or replacement of SN74AVC4T245DT?
All SN74AVC4T245DT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC4T245DT, 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 SN74AVC4T245DT part is unused and in its original packaging.
Return procedure for SN74AVC4T245DT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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