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Texas Instruments SN74AVC4T245DRE4
- Part No.:
- SN74AVC4T245DRE4
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AVC4T245DRE4.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 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) logic levels, enabling asynchronous translation without clocking or direction latching.
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 is at GND, preventing backflow current and supporting hot-swap and partial-power-down modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 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 level-shifting components. |
| Max Data Rate | 380Mbps (1.8V→3.3V) - Supports high-speed interfaces like SDIO, eMMC, and low-voltage parallel buses in mobile SoC designs. |
| I/O Voltage Tolerance | 4.6V - Allows safe interfacing with higher-voltage legacy signals while powered from sub-2V supplies. |
| Ioff Current | ±1μA max - Ensures negligible leakage during partial power-down, critical for battery-powered systems with dynamic rail gating. |
| ESD Rating | 8kV HBM - Meets industrial and consumer ESD robustness requirements without external protection diodes. |
| Propagation Delay | 2.6ns typical (VCCA=3.3V, VCCB=3.3V) - Enables timing-critical applications with tight setup/hold margins. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial temperature operation in embedded and automotive infotainment subsystems. |
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). This entry corresponds to the D (SOIC-16) variant: 9.9mm × 6mm body, standard through-hole or surface-mount compatible footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction-control input (per channel) | Referenced to VCCA; sets data flow direction: HIGH = A→B, LOW = B→A. |
| 1OE, 2OE | Output-enable input (per channel) | Referenced to VCCA; LOW enables outputs, HIGH places both A/B ports in high-Z state. |
| 1A1, 1A2, 2A1, 2A2 | A-port I/Os | Bi-directional data lines referenced to VCCA; tolerate up to 4.6V regardless of VCCA level. |
| 1B1, 1B2, 2B1, 2B2 | B-port I/Os | Bi-directional data lines referenced to VCCB; tolerate up to 4.6V regardless of VCCB level. |
| VCCA | A-port supply | Powers A-side I/Os and all control inputs (DIR/OE); defines VIH/VIL thresholds for control pins. |
| VCCB | B-port supply | Powers B-side I/Os only; independent of VCCA, enabling true dual-voltage domain operation. |
| GND | Ground reference | Common return for both power domains; required for proper Ioff and ESD clamp functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 2-bit channels | Enables concurrent, asymmetric voltage translation (e.g., 1.2V↔3.3V on Channel 1, 1.8V↔2.5V on Channel 2) without cross-talk or shared control constraints. |
| VCCA-referenced control inputs | DIR and OE thresholds scale with VCCA, eliminating need for external level shifters on control lines when interfacing with diverse host controllers. |
| Ioff-enabled partial power-down | Prevents damaging back-current when VCCA or VCCB is unpowered, simplifying power sequencing in multi-rail systems and extending battery life in always-on subsystems. |
| VCC isolation | Automatically forces both ports into high-Z if either VCCA or VCCB is at GND - critical for hot-plug and fail-safe isolation in modular hardware designs. |
| 4.6V-tolerant I/Os | Permits direct connection to 3.3V or 5V legacy signals while operating from 1.2V supplies, reducing BOM count and PCB area in mixed-voltage systems. |
Applications
| Mobile Processor Interfacing | Industrial Sensor Hub |
|---|---|
Use Scenario: Connecting a 1.2V application processor to a 3.3V display interface or camera module. IC Role / Device Role / Timing Role: Bidirectional level translator managing data, clock, and control signals between mismatched voltage domains with sub-3ns propagation delay. Use Value: Eliminates discrete resistor-based translators or dedicated level-shifter ICs, reducing component count and signal integrity risk in space-constrained handheld PCBs. | Use Scenario: Aggregating 1.8V I²C sensors and 2.5V analog front-ends into a 3.3V microcontroller-based gateway. IC Role / Device Role / Timing Role: Voltage-domain bridge enabling synchronous sensor readout and configuration writes across three distinct supply rails. Use Value: Maintains I²C timing compliance (400kHz fast-mode) while supporting hot-insertion of sensor nodes via Ioff and VCC isolation. |
| Enterprise SSD Controller | Telecom Baseband Interface |
Use Scenario: Translating command/status signals between a 1.5V NVMe controller and 1.8V NAND flash packages. IC Role / Device Role / Timing Role: High-speed, low-skew bidirectional translator handling address, command, and status lines with guaranteed 380Mbps capability. Use Value: Enables use of lower-power 1.5V controllers without sacrificing NAND interface speed or requiring complex multi-stage translation schemes. | Use Scenario: Interfacing a 2.5V FPGA baseband processor with 3.3V RF transceiver ICs in small-cell infrastructure. IC Role / Device Role / Timing Role: Robust, ESD-hardened translator for GPIO, reset, and interrupt lines in thermally demanding outdoor environments. Use Value: Delivers 8kV HBM ESD protection and –40°C to +85°C operation without derating, reducing field failure rates in uncontrolled ambient deployments. |
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, 5.5V-tolerant I/Os | Not suitable for <1.65V systems or partial-power-down designs; requires external pullups for 1.2V/1.5V hosts | Select when cost sensitivity outweighs ultra-low-voltage support and Ioff is unnecessary. |
| TXB0104 | Auto-direction sensing (no DIR pin), lower drive strength (±2mA), supports 1.2V–3.3V but not 3.6V, no 4.6V tolerance | Eliminates direction control logic but adds propagation delay uncertainty; unsuitable for deterministic full-duplex protocols | Select for simple uni-directional or auto-sensed I²C/SPI where DIR pin overhead must be avoided. |
Compared with SN74LVC4T245 and TXB0104, the SN74AVC4T245 uniquely supports 1.2V operation with Ioff, 4.6V I/O tolerance, and 380Mbps throughput-making it the only option for high-speed, ultra-low-voltage, and power-gated system designs requiring deterministic direction control.
Availability
SN74AVC4T245 is available at Aetrix Electronics and suitable for mobile processor interfacing, industrial sensor hubs, enterprise SSD controllers, and telecom baseband interfaces requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
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-power bidirectional voltage translation in battery-operated and multi-rail 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 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) of the official datasheet, with validated operation down to 1.2V on both rails.
How does the SN74AVC4T245 handle power sequencing when one supply is off?
The SN74AVC4T245 uses Ioff circuitry to disable outputs when either VCCA or VCCB is at GND, preventing damaging back-current flow. Its VCC isolation feature automatically places both A and B ports in high-impedance state if either supply is unpowered - a behavior explicitly documented in Section 7.4 and Figure 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 200Mbps for sub-1.8V translations and 100Mbps when translating to 1.2V - all values are measured under defined load and voltage conditions per JEDEC standards.
Is the SN74AVC4T245 pin-compatible with other TI 4-bit transceivers like the SN74LVC4T245?
No, the SN74AVC4T245 is not pin-compatible with SN74LVC4T245. While both are 16-pin devices, the SN74AVC4T245 uses a dual-channel architecture with separate DIR/OE pins per channel (1DIR/2DIR, 1OE/2OE), whereas SN74LVC4T245 uses single DIR/OE for all four bits. Pin functions and placement differ - see Figures 4-1 through 4-5 in the SN74AVC4T245 datasheet for exact mapping.
Does the SN74AVC4T245 require external pull-up resistors on its control inputs?
The SN74AVC4T245 does not require external pull-ups on DIR or OE for basic operation, as its inputs are CMOS with rail-to-rail thresholds referenced to VCCA. However, to ensure high-impedance state during power-up/power-down, TI recommends tying OE to VCCA via a pull-up resistor - minimum value determined by the driver's sink capability, as detailed in Section 8.3 of the SN74AVC4T245 datasheet.
SN74AVC4T245DRE4 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
SN74AVC4T245DRE4 FAQ
1.How can I place an order for SN74AVC4T245DRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC4T245DRE4 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 SN74AVC4T245DRE4 reliable?
The price and inventory of SN74AVC4T245DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC4T245DRE4 is usually 5 days.
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SN74AVC4T245DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVC4T245DRE4 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 SN74AVC4T245DRE4?
For technical support, including SN74AVC4T245DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC4T245DRE4 requirements.
6.How does Aetrix verify that SN74AVC4T245DRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AVC4T245DRE4 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 SN74AVC4T245DRE4 meets industry standards.
7.What is the process for return or replacement of SN74AVC4T245DRE4?
All SN74AVC4T245DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC4T245DRE4, 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 SN74AVC4T245DRE4 part is unused and in its original packaging.
Return procedure for SN74AVC4T245DRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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