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Texas Instruments SN74AVC4T245BQBR
- Part No.:
- SN74AVC4T245BQBR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVC4T245BQBR.pdf
- Description:
- FOUR-BIT DUAL-SUPPLY BUS TRANSCE
- Quantity:
- Payment:
- Shipping:
Inventory:3,196
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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 in low-voltage interconnects between processors 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, VCCA-referenced DIR/OE inputs, Ioff-enabled isolation during power sequencing, and verified 380Mbps performance at 1.8V-to-3.3V translation.
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-tracked) and B-port (VCCB-tracked) operation, enabling simultaneous translation across mismatched supply domains without level-shifter ICs or external biasing.
Each channel supports asynchronous direction control: DIR = HIGH enables A→B transmission; DIR = LOW enables B→A transmission; OE = HIGH forces both ports into high-impedance state. The Ioff circuitry disables outputs when either VCCA or VCCB is at GND, preventing backflow current during partial power-down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V - Enables universal translation among 1.2V/1.5V/1.8V/2.5V/3.3V nodes without external components |
| Max Data Rate | 380Mbps (1.8V→3.3V) - Supports high-speed interfaces like SDIO, eMMC, and low-voltage parallel buses |
| I/O Voltage Tolerance | 4.6V - Allows safe interfacing with higher-voltage legacy systems or transient-tolerant designs |
| Ioff Current | ±0.1μA (max) - Ensures negligible leakage during partial power-down, critical for battery-powered sleep modes |
| ESD Protection | 8kV HBM - Meets industrial-grade robustness requirements without additional protection circuitry |
| Propagation Delay | 2.6ns (min, VCCA=3.3V→VCCB=2.5V) - Enables timing-critical applications with sub-3ns signal path latency |
| Operating Temp | –40°C to +85°C - Qualified for extended temperature industrial and automotive cabin environments |
Pinout & Package
SN74AVC4T245BQBR uses a 16-pin WQFN package (3.5mm × 2.5mm) with exposed thermal pad. Pin functions are validated per TI SCES576I Rev. FEBRUARY 2025, Figure 4-4 and Table 4-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per channel) | Referenced to VCCA; HIGH = A→B, LOW = B→A; enables true bidirectional flow without external logic |
| 1OE, 2OE | Output-enable input (per channel) | Referenced to VCCA; HIGH = high-impedance state on associated port; supports independent channel isolation |
| 1A1–2A2 | A-port I/O (4 pins) | Referenced to VCCA; accepts 1.2–3.6V logic; always active-must be driven to avoid excess ICCZ |
| 1B1–2B2 | B-port I/O (4 pins) | Referenced to VCCB; accepts 1.2–3.6V logic; electrically isolated from A-port except during data transfer |
| VCCA, VCCB | Independent power supplies | VCCA powers A-port I/Os and all control inputs; VCCB powers B-port I/Os only; no shared rail dependency |
| GND (pins 8,9) | Ground reference | Common return for both supply domains; thermal pad must be soldered for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.2–3.6V operation on A and B ports eliminates need for external level-shifting circuitry |
| VCCA-referenced controls | DIR and OE inputs tied to VCCA simplify control logic design and reduce supply dependency conflicts |
| Ioff partial-power-down | Blocks backflow current when VCCA or VCCB is unpowered-enables safe hot-plug and power-gating scenarios |
| VCC isolation | Both ports enter high-Z if either VCCA or VCCB = GND-prevents unintended signal coupling during brownout |
| 4.6V I/O tolerance | Withstands overvoltage transients beyond supply rails-reduces need for external clamping diodes |
Applications
| Mobile Processor Interconnect | Industrial Sensor Hub Interface |
|---|---|
Use Scenario: Connecting a 1.8V application processor to a 3.3V display interface IC in a handheld device. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing data flow between processor GPIO and display command bus. Use Value: Enables direct interface without discrete resistors or MOSFET translators-reducing BOM count and PCB area by >40%. | Use Scenario: Linking a 1.2V MEMS sensor array to a 2.5V microcontroller ADC input in an IIoT edge node. IC Role / Device Role / Timing Role: Level-shifting transceiver providing noise-immune digital communication while maintaining sub-10ns propagation delay. Use Value: Maintains signal integrity at 20MHz sampling rates and supports Ioff-driven low-power sleep states (<1μA system leakage). |
| Automotive Infotainment Backplane | Enterprise SSD Controller Bridge |
Use Scenario: Interfacing a 1.5V SoC to a 3.3V CAN transceiver and audio codec in a vehicle head unit. IC Role / Device Role / Timing Role: Dual-channel translator isolating mixed-voltage subsystems while supporting hot-swap-safe power sequencing. Use Value: Eliminates risk of latch-up during ignition-cycle voltage ramping-validated to JESD78 Class II (>100mA latch-up immunity). | Use Scenario: Bridging a 1.8V NVMe controller to a 3.3V PCIe switch in a high-density server SSD module. IC Role / Device Role / Timing Role: High-speed bidirectional buffer translating command/status signals with <3ns skew between lanes. Use Value: Achieves 380Mbps throughput at 1.8V→3.3V-meets PCIe Gen2 timing margins without retiming logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4T245PWR | Single-supply (1.65–3.6V), no VCCB independence; max 24mA drive; no Ioff | Limited to same-voltage-domain translation; unsuitable for partial-power-down or asymmetric rail designs | Select only when both sides operate at identical voltage and power sequencing is synchronized |
| TXB0104RGYR | Auto-direction sensing (no DIR pin); lower drive strength (±2mA); 1.2–3.6V dual-rail but no 4.6V tolerance | Eliminates DIR control wiring but adds propagation delay uncertainty; not suitable for deterministic timing paths | Prefer for simple GPIO expansion where direction changes infrequently; avoid in high-speed synchronous buses |
Compared with SN74LVC4T245PWR and TXB0104RGYR, the SN74AVC4T245 provides guaranteed dual-rail configurability, 4.6V I/O tolerance, and Ioff-enabled power sequencing-making it the only option qualified for mixed-voltage, hot-plug, and battery-sensitive designs requiring deterministic direction control.
Availability
SN74AVC4T245BQBR is available at Aetrix Electronics and suitable for mobile processor interconnect, industrial sensor hub interface, and automotive infotainment backplane applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74AVC4T245BQBR 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 ultra-low-voltage bidirectional translation in space-constrained, power-sensitive portable and 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). This allows translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. The device remains fully operational even when VCCA and VCCB differ-enabling flexible system-level voltage domain partitioning without external components. The SN74AVC4T245 is specified down to 1.2V on both rails, making it suitable for next-generation ultra-low-power designs.
How does the SN74AVC4T245 handle power sequencing during system startup or shutdown?
SN74AVC4T245 incorporates Ioff and VCC isolation features to manage power sequencing safely. When either VCCA or VCCB is at GND, both ports automatically enter high-impedance mode-preventing backflow current and signal contention. To ensure high-Z state during power-up, OE must be tied to VCCA via a pullup resistor. The SN74AVC4T245's Ioff specification (±0.1μA max) guarantees minimal leakage during partial power-down, a critical requirement for battery-backed or energy-harvesting systems where the SN74AVC4T245 maintains isolation integrity.
Can the SN74AVC4T245 translate signals at 380Mbps in all voltage combinations?
No-the 380Mbps maximum data rate applies specifically to translation from 1.8V to 3.3V. Other combinations have lower limits: <1.8V→3.3V and translations to 2.5V or 1.8V are rated at 200Mbps; to 1.5V at 150Mbps; and to 1.2V at 100Mbps. These values are measured under defined load and signal integrity conditions per TI SCES576I. The SN74AVC4T245's actual achievable speed depends on PCB layout, termination, and noise margin-so system validation at target voltage pairs is required before finalizing timing budgets for the SN74AVC4T245.
What is the purpose of the thermal pad on the SN74AVC4T245BQBR package?
The exposed thermal pad on the SN74AVC4T245BQBR (3.5mm × 2.5mm WQFN) provides a low-thermal-resistance path from the die to the PCB ground plane. With RθJC(bot) = 28.4°C/W, proper soldering of the pad significantly improves power dissipation capability-especially under sustained 380Mbps operation or elevated ambient temperatures. TI recommends connecting the pad directly to a solid internal GND plane using ≥4 thermal vias. Failure to solder the pad may cause junction temperature to exceed 125°C under full-load conditions, degrading reliability and potentially violating the SN74AVC4T245's thermal specifications.
Does the SN74AVC4T245 require external pullup or pulldown resistors on its I/O pins?
No-external resistors are not required on A or B port I/Os during normal operation, as input circuitry remains active regardless of OE/DIR state. However, TI strongly recommends tying OE to VCCA via a pullup resistor (value determined by driver sink capability) to guarantee high-impedance state during power-up/power-down. Leaving DIR or OE floating is prohibited: uncontrolled logic levels can cause excessive ICCZ current or unintended data flow. The SN74AVC4T245's design assumes all control and data pins are actively driven-never left floating-to maintain specified ICCA/ICCB leakage and switching performance.
SN74AVC4T245BQBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 2
- Channels per Circuit:
- 2
- Voltage - VCCA:
- 1.2 V ~ 3.6 V
- Voltage - VCCB:
- 1.2 V ~ 3.6 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Push-Pull, Tri-State
- Data Rate:
- 380Mbps
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WFQFN Exposed Pad
SN74AVC4T245BQBR FAQ
1.How can I place an order for SN74AVC4T245BQBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC4T245BQBR 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 SN74AVC4T245BQBR reliable?
The price and inventory of SN74AVC4T245BQBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC4T245BQBR is usually 5 days.
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SN74AVC4T245BQBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVC4T245BQBR 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 SN74AVC4T245BQBR?
For technical support, including SN74AVC4T245BQBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC4T245BQBR requirements.
6.How does Aetrix verify that SN74AVC4T245BQBR is sourced from the original manufacturer or authorized distributors?
All SN74AVC4T245BQBR 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 SN74AVC4T245BQBR meets industry standards.
7.What is the process for return or replacement of SN74AVC4T245BQBR?
All SN74AVC4T245BQBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC4T245BQBR, 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 SN74AVC4T245BQBR part is unused and in its original packaging.
Return procedure for SN74AVC4T245BQBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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