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Texas Instruments SN74AVC4T245DRG4
- Part No.:
- SN74AVC4T245DRG4
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AVC4T245DRG4.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16SOIC
- Quantity:
- Payment:
- Shipping:
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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 dual-rail configurability, 3-state output control per channel, Ioff-enabled isolation during power sequencing, voltage translation directionality (A↔B), and thermal performance across SOIC/DGV/PW/RGY/RSV/BQB/DYY 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 asynchronous translation without clock domain alignment.
Directional data flow is determined by DIR state (low = B→A, high = A→B), while OE independently places each port's outputs into high-impedance mode. The Ioff circuit disables I/O paths when either VCCA or VCCB is at GND, preventing backflow current and supporting hot-insertion scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V - Enables translation between all common low-voltage nodes (1.2V, 1.5V, 1.8V, 2.5V, 3.3V) without external biasing. |
| Max Data Rate | 380Mbps (1.8V→3.3V) - Supports high-speed interfaces like memory expansion buses and FPGA-to-ASIC links. |
| I/O Voltage Tolerance | 4.6V - Allows safe interfacing with legacy 3.3V or 5V systems without clamping diodes or external protection. |
| Ioff Current | ±5μA max - Ensures negligible leakage during partial power-down, critical for battery-backed subsystems and hot-swap compliance. |
| ESD Rating | 8kV HBM - Meets industrial-grade ESD robustness requirements for board-level handling and field operation. |
| Operating Temp | –40°C to +85°C - Qualified for extended industrial temperature range applications including factory automation and telecom infrastructure. |
| Propagation Delay | 2.6ns min (VCCA=3.3V, VCCB=2.5V) - Enables timing-critical signal routing with sub-nanosecond margin in high-frequency designs. |
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). Package choice impacts thermal resistance (RθJA: 68.8°C/W for RGY vs. 163.4°C/W for DYY) and board space (RSV: 2.6mm × 1.8mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction-control input (per channel) | Referenced to VCCA; determines data flow direction (A→B or B→A) for respective 2-bit channel. |
| 1OE, 2OE | Output-enable input (per channel) | Referenced to VCCA; high = 3-state on associated port outputs, enabling bus arbitration and isolation. |
| 1A1–2A2 | A-port I/O (4 pins) | Referenced to VCCA; connect to low-voltage controller side (e.g., 1.2V/1.8V SoC I/O banks). |
| 1B1–2B2 | B-port I/O (4 pins) | Referenced to VCCB; connect to higher-voltage peripheral side (e.g., 2.5V/3.3V memory or interface ICs). |
| VCCA, VCCB | Independent supply rails | VCCA powers A-port I/Os and all control inputs; VCCB powers B-port I/Os - enables true dual-voltage operation. |
| GND | Ground reference | Two dedicated GND pins (pins 8 & 9 in SOIC) reduce ground bounce and improve noise immunity in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent VCCA/VCCB rails allow simultaneous operation at mismatched voltages (e.g., 1.2V A-side ↔ 3.3V B-side) without level-shifter ICs or resistive dividers. |
| Per-channel direction & enable control | Separate DIR and OE pins for each 2-bit section enable granular bus management - e.g., isolate one peripheral while servicing another on same transceiver. |
| Ioff-enabled partial power-down | Prevents damaging current backflow when VCCA or VCCB is unpowered, supporting safe power sequencing in multi-rail systems and hot-plug architectures. |
| VCC isolation | When either VCCA or VCCB = GND, both ports enter high-impedance state - eliminates need for external isolation logic during brownout or reset conditions. |
| 4.6V-tolerant I/Os | Allows direct connection to 3.3V or 5V legacy peripherals without external clamping, reducing BOM count and PCB area in mixed-voltage upgrades. |
Applications
| Industrial PLC I/O Modules | Automotive ADAS Sensor Fusion |
|---|---|
Use Scenario: Interfacing 1.8V microcontroller GPIOs to 3.3V analog front-end ADCs and digital isolators in programmable logic controller modules. IC Role / Device Role / Timing Role: Bidirectional level translator ensuring signal integrity across voltage domains while maintaining real-time deterministic response under EMC stress. Use Value: Eliminates discrete resistor networks and reduces layout complexity, enabling compact 2-layer PCB designs compliant with IEC 61000-4-2/4-4. | Use Scenario: Connecting 1.2V automotive SoC MIPI CSI-2 camera interfaces to 2.5V image signal processors in surround-view systems. IC Role / Device Role / Timing Role: High-speed, low-jitter voltage translator preserving pixel clock timing margins (<100ps skew) across differential pairs. Use Value: Achieves 380Mbps throughput at 1.8V→3.3V translation, meeting MIPI D-PHY v1.2 eye diagram requirements without added delay compensation. |
| Enterprise SSD Controller Interconnect | Telecom Baseband FPGAs |
Use Scenario: Bridging 1.5V NVMe controller I/Os to 3.3V PCIe switch PHYs and flash memory buffers in enterprise solid-state drives. IC Role / Device Role / Timing Role: Asynchronous bus transceiver providing glitch-free handshaking during link training and power state transitions (L0→L1). Use Value: Ioff support ensures no current leakage during L1 substates, extending drive idle power efficiency by >15% versus non-Ioff alternatives. | Use Scenario: Level-shifting between 1.8V FPGA I/O banks and 2.5V RF transceiver digital control lines (SPI, JESD204B SYNC) in 5G massive MIMO base stations. IC Role / Device Role / Timing Role: Configurable voltage translator enabling dynamic reconfiguration of control voltage domains without hardware changes. Use Value: Dual-rail flexibility allows single BOM part to support multiple FPGA I/O standards (LVCMOS18/LVCMOS25), reducing inventory SKUs by 40%. |
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), narrower VCC range (1.65–3.6V), no Ioff, 3.6V I/O tolerance only. | Suitable for cost-sensitive 3.3V↔1.8V applications where partial power-down is not required. | Select SN74LVC4T245 only if operating exclusively above 1.65V and thermal/power constraints permit higher ICCZ. |
| TXB0104 | Auto-direction sensing (no DIR pin), lower drive strength (±4mA), 3.6V I/O tolerance, no VCC isolation feature. | Better for simple push-pull data lines with known direction flow; unsuitable for bidirectional buses requiring explicit DIR control. | Choose TXB0104 for UART/SPI lines with fixed direction; avoid for PCIe/NVMe where DIR-controlled arbitration is mandatory. |
Compared with SN74LVC4T245 and TXB0104, the SN74AVC4T245 provides wider voltage range (1.2–3.6V), higher speed (380Mbps), Ioff-enabled power sequencing, and VCC isolation - making it the sole option for 1.2V system integration and safety-critical hot-swap applications.
Availability
SN74AVC4T245 is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS sensor fusion, enterprise SSD controllers, and telecom baseband FPGAs requiring stable component supply across extended temperature and mixed-voltage environments.
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, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74AVC4T245 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional translation in power-constrained, multi-rail systems such as portable instrumentation and next-gen telecom infrastructure.
FAQ
What voltage ranges does the SN74AVC4T245 support on its A and B ports?
The SN74AVC4T245 supports 1.2V to 3.6V on both VCCA (A-port supply) and VCCB (B-port supply), 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 TI datasheet SCES576I.
How does the SN74AVC4T245 handle power sequencing when VCCA or VCCB is unpowered?
The SN74AVC4T245 uses Ioff circuitry and VCC isolation to disable I/O paths when either VCCA or VCCB is at GND, preventing backflow current and placing both ports in high-impedance state. This behavior is explicitly documented in Section 7.3.3 and Table 7-1 of the SN74AVC4T245 datasheet.
What is the maximum data rate supported by the SN74AVC4T245, and under what conditions?
The SN74AVC4T245 achieves up to 380Mbps when translating from 1.8V to 3.3V, as specified in Section 1 (Features) and verified in Section 5.7–5.11 switching characteristics tables. Performance degrades to 100Mbps when translating to 1.2V due to reduced noise margin and drive strength.
Does the SN74AVC4T245 require external pull-up resistors on OE pins, and why?
Yes - to ensure high-impedance state during power-up/power-down, OE must be tied to VCCA via a pull-up resistor. The minimum value depends on the driver's current-sinking capability, as stated in Section 3 (Description) and Section 8.3 (Power Supply Recommendations) of the SN74AVC4T245 datasheet.
Which packages are available for the SN74AVC4T245, and how do they differ thermally?
The SN74AVC4T245 is offered in D (SOIC), DGV (TVSOP), PW (TSSOP), RGY (WQFN), RSV (UQFN), BQB (WQFN), and DYY (SOT) packages. Thermal resistance varies significantly: RGY has RθJA = 68.8°C/W, while DYY reaches 163.4°C/W - making RGY preferred for high-density, thermally constrained layouts.
SN74AVC4T245DRG4 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:
- Discontinued at Digi-Key
- 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
SN74AVC4T245DRG4 FAQ
1.How can I place an order for SN74AVC4T245DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC4T245DRG4 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 SN74AVC4T245DRG4 reliable?
The price and inventory of SN74AVC4T245DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC4T245DRG4 is usually 5 days.
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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 SN74AVC4T245DRG4?
For technical support, including SN74AVC4T245DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC4T245DRG4 requirements.
6.How does Aetrix verify that SN74AVC4T245DRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AVC4T245DRG4 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 SN74AVC4T245DRG4 meets industry standards.
7.What is the process for return or replacement of SN74AVC4T245DRG4?
All SN74AVC4T245DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC4T245DRG4, 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 SN74AVC4T245DRG4 part is unused and in its original packaging.
Return procedure for SN74AVC4T245DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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