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Texas Instruments SN74AVC4T245DR
- Part No.:
- SN74AVC4T245DR
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AVC4T245DR.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,246
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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 is used in low-voltage interconnects between SoCs and peripherals in portable electronics.
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/TSSOP/WQFN 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 level shifting without clock or timing constraints.
Each channel operates in three functional states: A→B transmission (DIR=H, OE=L), B→A transmission (DIR=L, OE=L), or full high-impedance isolation (OE=H). The Ioff circuit disables outputs when either VCCA or VCCB is at 0V, preventing backflow current and supporting hot-insertion scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage range (VCCA/VCCB) | 1.2V to 3.6V - enables translation across 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 interface bridging for USB PHY, memory expansion, 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 level-shifter buffers. |
| Ioff current | ±5μA max - ensures negligible leakage during partial power-down, critical for battery-powered system sleep modes. |
| ESD rating (HBM) | 8kV - meets industrial-grade robustness requirements for handheld and field-deployable equipment. |
| Operating temperature | –40°C to +85°C - qualified for extended industrial ambient operation without derating. |
| Propagation delay (tPLH/tPHL) | 2.6ns typical (VCCA=3.3V, VCCB=2.5V) - enables sub-400MHz signal integrity in synchronous data paths. |
Pinout & Package
SN74AVC4T245 is available in multiple 16-pin packages including SOIC (D), TSSOP (PW), TVSOP (DGV), WQFN (RGY/BQB), UQFN (RSV), and SOT (DYY). All variants share identical pin numbering and function mapping per TI SCES576I Rev. I.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per channel) | Referenced to VCCA; sets data flow direction: DIR=H → A→B, DIR=L → B→A. |
| 1OE, 2OE | Output-enable input (per channel) | Referenced to VCCA; OE=H places corresponding port outputs in high-impedance state. |
| 1A1–2A2 | A-port I/O (4 pins) | Bi-directional signals referenced to VCCA; tolerate up to 4.6V regardless of VCCA setting. |
| 1B1–2B2 | B-port I/O (4 pins) | Bi-directional signals referenced to VCCB; tolerate up to 4.6V regardless of VCCB setting. |
| VCCA | A-port supply | Powers A-port I/Os and control inputs (DIR/OE); defines VIH/VIL thresholds for control pins. |
| VCCB | B-port supply | Powers B-port I/Os only; independent of VCCA, enabling asymmetric voltage translation. |
| GND | Ground reference | Common return for both power domains; no internal isolation - requires shared ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 2-bit channels | Enables concurrent A↔B and A↔B translation with separate DIR/OE control - eliminates need for two discrete transceivers in multi-bus systems. |
| VCCA-referenced control logic | DIR and OE thresholds scale with VCCA, ensuring reliable control activation even when VCCA ≠ VCCB - removes level-shifter dependency for control signals. |
| Ioff-enabled partial power-down | Prevents damaging back-current when VCCA or VCCB is unpowered - simplifies power sequencing in multi-rail systems with staggered supply ramps. |
| VCC isolation behavior | Both ports enter high-Z if either VCCA or VCCB = GND - provides fail-safe isolation during brown-out or hot-swap events. |
| 4.6V-tolerant I/Os | Allows direct connection to 3.3V or 5V buses without external protection - reduces BOM count and PCB area in mixed-voltage designs. |
Applications
| Mobile SoC Interfacing | Industrial Sensor Hub |
|---|---|
Use Scenario: Connecting a 1.8V application processor to a 3.3V camera module or display interface in smartphones or tablets. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing data and control lines (e.g., I²C, GPIO, parallel video) between mismatched voltage domains. Use Value: Eliminates need for separate level shifters per signal line while maintaining 380Mbps throughput for high-resolution image streaming. | Use Scenario: Aggregating 1.2V/1.5V MEMS sensors and 2.5V analog front-ends into a 3.3V microcontroller-based sensor node. IC Role / Device Role / Timing Role: Voltage-translating I/O bridge enabling simultaneous read/write access to heterogeneous sensor interfaces under single MCU control. Use Value: Supports hot-plug capability via Ioff and withstands 8kV HBM ESD - critical for field-deployable industrial gateways. |
| FPGA I/O Expansion | Enterprise SSD Controller Interface |
Use Scenario: Extending FPGA I/O banks to drive 1.2V DDR3L memory and 1.8V PCIe SerDes retimers on the same board. IC Role / Device Role / Timing Role: Configurable dual-rail transceiver providing isolated, direction-controlled data paths between FPGA and peripheral ICs. Use Value: Enables per-channel OE control to prevent bus contention during configuration updates - improves system reliability during firmware upgrades. | Use Scenario: Bridging a 1.5V NVMe controller ASIC to 3.3V power management ICs and thermal sensors in enterprise SSD modules. IC Role / Device Role / Timing Role: High-speed bidirectional translator handling command/status handshaking and telemetry data across voltage domains. Use Value: Delivers <3ns propagation delay and 4.6V I/O tolerance - ensures signal integrity and interoperability with legacy PMICs in compact M.2 form factors. |
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 support. | Suitable only for 1.8V/2.5V/3.3V translation; not viable for 1.2V/1.5V systems or partial-power-down use cases. | Select when cost sensitivity outweighs need for ultra-low-voltage support or Ioff safety. |
| TXB0104 | Auto-direction sensing (no DIR pin), lower drive strength (±8mA), higher ICCZ (20μA vs. 5μA). | Eliminates DIR control wiring but introduces timing uncertainty on direction transitions; less suitable for deterministic bidirectional protocols like SPI or parallel bus. | Select for simple push-pull GPIO translation where direction changes infrequently and layout simplicity is prioritized. |
Compared with SN74LVC4T245 and TXB0104, the SN74AVC4T245 uniquely supports 1.2V operation, offers the highest data rate (380Mbps), includes Ioff for robust power sequencing, and provides explicit DIR control for deterministic bidirectional communication - making it optimal for high-performance, multi-voltage embedded systems.
Availability
SN74AVC4T245 is available at Aetrix Electronics and suitable for mobile device design, industrial sensor aggregation, FPGA I/O expansion, and enterprise SSD controller interfacing requiring stable component supply and long-term production continuity.
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 company delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.
The SN74AVC4T245 belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family, engineered specifically for high-speed, low-voltage bidirectional level translation in space-constrained, power-sensitive applications.
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). This enables translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. The device remains fully operational at the minimum 1.2V supply, unlike older LVC-family transceivers that require ≥1.65V.
How does the SN74AVC4T245 handle power sequencing when VCCA and VCCB ramp at different times?
The SN74AVC4T245 uses Ioff circuitry to disable outputs when either VCCA or VCCB is at 0V, preventing backflow current. Its VCC isolation feature forces both ports into high-impedance state if either supply is grounded. To ensure safe startup, tie OE to VCCA via a pullup resistor so outputs remain disabled until both supplies stabilize.
Can the SN74AVC4T245 translate between 1.2V and 3.3V, and what is its maximum data rate in that configuration?
Yes, the SN74AVC4T245 supports 1.2V ↔ 3.3V translation. Its maximum data rate in this configuration is 100Mbps, as specified in the datasheet's switching characteristics tables (Section 5.7–5.11). Performance degrades at lower VCCA due to reduced drive strength and increased propagation delay.
Is the SN74AVC4T245 compatible with 5V systems?
The SN74AVC4T245 I/Os are rated for 4.6V absolute maximum, making them tolerant of 3.3V systems but not directly compatible with 5V logic. Applying 5V to any I/O pin exceeds the absolute maximum rating and risks permanent damage. For 5V interfacing, a dedicated 5V-tolerant translator such as the SN74AVC8T245 is required.
Does the SN74AVC4T245 require external pull-up or pull-down resistors on its DIR and OE pins?
DIR and OE inputs are CMOS-compatible and do not require external biasing for static operation. However, to ensure defined logic states during power-up/power-down, TI recommends tying OE to VCCA through a pullup resistor (value determined by driver sink capability) to force high-impedance mode until supplies are stable. DIR may be driven directly from a VCCA-referenced controller.
SN74AVC4T245DR 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
SN74AVC4T245DR FAQ
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7.What is the process for return or replacement of SN74AVC4T245DR?
All SN74AVC4T245DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC4T245DR, 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 SN74AVC4T245DR part is unused and in its original packaging.
Return procedure for SN74AVC4T245DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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