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Texas Instruments SN74AVC2T45DCUTG4
- Part No.:
- SN74AVC2T45DCUTG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVC2T45DCUTG4.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AVC2T45 from Texas Instruments is a 2-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V domains. It features independent VCCA (1.2–3.6V) and VCCB (1.2–3.6V) rails, 4.6V I/O overvoltage tolerance, Ioff partial-power-down support, and VCC isolation. It is used in high-density mobile and computing interconnects where asynchronous data routing across mismatched voltage nodes is required.
For engineers reviewing the SN74AVC2T45 datasheet, SN74AVC2T45 pinout, SN74AVC2T45 application, or SN74AVC2T45 equivalent, this page delivers verified electrical parameters, directional control behavior, thermal metrics for VSSOP-8 packaging, real-world level-shifting use cases, and validated alternative parts with documented functional and application differences.
Technical Context
The SN74AVC2T45 implements a dual-rail CMOS transceiver architecture with DIR-controlled signal directionality: logic LOW on DIR enables B→A data flow; HIGH enables A→B. Both A and B ports remain input-active regardless of DIR state, requiring defined logic levels to prevent leakage.
VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = 0V, while Ioff limits back-current during partial power-down. Propagation delays range from 2.1 ns (A→B, VCCA=3.3V/VCCB=2.5V) to 3.4 ns (B→A, VCCA=1.2V/VCCB=1.2V), supporting up to 500 Mbps (1.8V→3.3V) data rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA / VCCB) | 1.2V to 3.6V each - enables universal bidirectional translation among 1.2V/1.5V/1.8V/2.5V/3.3V logic domains |
| Max Data Rate | 500 Mbps - achievable only in 1.8V→3.3V level-shifting configuration; drops to 240 Mbps at 1.2V output |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with higher-voltage systems without external clamping |
| Ioff Current | ±5 µA max - guarantees safe partial-power-down operation with no damaging back-current |
| Propagation Delay (A→B) | 2.1 ns min (VCCA=3.3V/VCCB=2.5V) - supports high-speed synchronous and asynchronous bus bridging |
| ESD Rating (HBM) | ±8000 V - meets industrial-grade robustness requirements for handheld and server applications |
| Operating Temperature | –40°C to +85°C - qualified for commercial and extended-temperature embedded systems |
Pinout & Package
SN74AVC2T45DCUTG4 uses the DCU package: 8-pin VSSOP (2.30 mm × 2.00 mm), part of Texas Instruments' NanoFree™ die-as-package technology.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | Power supply for A-side I/Os | Defines logic thresholds and output swing for A1/A2; powers DIR input |
| A1 (Pin 2) | Bidirectional data port A | Transmits from A bus to B bus when DIR = HIGH; receives from B bus when DIR = LOW |
| A2 (Pin 3) | Bidirectional data port A | Functionally identical to A1; supports 2-bit parallel translation |
| GND (Pin 4) | Reference ground | Common return path for both supply domains; required for stable CMOS switching |
| DIR (Pin 5) | Direction control input | Referenced to VCCA; LOW = B→A, HIGH = A→B; no OE pin - direction is sole enable mechanism |
| B2 (Pin 6) | Bidirectional data port B | Transmits from B bus to A bus when DIR = LOW; receives from A bus when DIR = HIGH |
| B1 (Pin 7) | Bidirectional data port B | Functionally identical to B2; completes 2-bit channel |
| VCCB (Pin 8) | Power supply for B-side I/Os | Defines logic thresholds and output swing for B1/B2; independent of VCCA |
Key Features
| Feature | Design Value |
|---|---|
| Dual configurable supply rails | Enables simultaneous connection to two independent voltage domains (e.g., 1.8V SoC core ↔ 3.3V peripheral bus) |
| VCC isolation | Forces both A and B ports into high-Z if either VCCA or VCCB collapses to GND - prevents bus contention during power sequencing |
| Ioff partial-power-down support | Blocks current flow between powered and unpowered rails, eliminating risk of back-driving or latch-up in mixed-power systems |
| 4.6V I/O tolerance | Allows direct interface to legacy 3.3V or 5V-tolerant peripherals without external level-shifters or resistive dividers |
| NanoFree™ packaging | Die-scale VSSOP footprint (2.30 × 2.00 mm) reduces PCB area and parasitic inductance for high-speed signal integrity |
Applications
| Mobile Baseband Interface | Server Memory Subsystem |
|---|---|
|
Use Scenario: Interfacing a 1.2V application processor I²C bus to a 1.8V PMIC or sensor hub. IC Role / Device Role / Timing Role: Bidirectional level shifter managing clock/data lines with sub-3ns propagation delay and no added timing skew. Use Value: Eliminates need for discrete MOSFET-based translators, reducing BOM count and layout complexity in space-constrained smartphones. |
Use Scenario: Bridging DDR4 memory controller (1.2V) to SPD EEPROM (2.5V) in enterprise servers. IC Role / Device Role / Timing Role: Asynchronous bus transceiver translating SMBus signals with guaranteed 4.6V I/O tolerance and Ioff protection during hot-plug events. Use Value: Ensures reliable SPD read/write during memory module insertion/removal without system reset or rail sequencing dependency. |
| Desktop Platform I/O Expansion | Industrial Edge Controller |
|
Use Scenario: Connecting a 3.3V PCIe switch control interface to a 1.5V FPGA configuration manager. IC Role / Device Role / Timing Role: Dual-bit directional translator handling GPIO and status signals with VCC isolation preventing false asserts during FPGA power-up. Use Value: Enables clean power sequencing across heterogeneous silicon, avoiding boot failures caused by floating or contested control lines. |
Use Scenario: Isolating 2.5V industrial Ethernet PHY registers from a 1.8V microcontroller's SPI interface. IC Role / Device Role / Timing Role: Level-shifting transceiver operating across –40°C to +85°C with ±8 kV HBM ESD protection for harsh environments. Use Value: Delivers field-reliable communication without external TVS diodes or voltage translators, simplifying certification for industrial EMC standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0102RGTR | Auto-direction sensing (no DIR pin); lower drive strength (±8 mA vs ±12 mA); 1.65–5.5V supply range | Eliminates direction-control logic but adds capacitive loading and slower edge rates; unsuitable for deterministic timing-critical paths | Select when system lacks dedicated DIR control lines and can tolerate ~2× higher propagation delay (typ. 5.2 ns) |
| SN74LVC2T45DCUR | Single-supply only (VCC = 1.65–5.5V); no VCC isolation; 5.5V-tolerant I/Os; lower ESD rating (±2 kV HBM) | Requires shared rail - cannot translate between isolated domains; lacks Ioff and VCC isolation for partial-power-down safety | Select only for cost-sensitive, single-rail designs where domain separation and power sequencing are not required |
Compared with TXB0102RGTR and SN74LVC2T45DCUR, SN74AVC2T45DCUTG4 uniquely supports true dual-rail isolation, deterministic DIR-controlled directionality, and industrial-grade ESD robustness - making it the only choice for safety-critical, mixed-voltage, and hot-plug-capable systems.
Availability
SN74AVC2T45DCUTG4 is available at Aetrix Electronics and suitable for smartphone baseband interfaces, server memory subsystems, and desktop I/O expansion requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SN74AVC2T45DCUTG4 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, with over 90 years of innovation in precision analog, power management, and interface ICs.
The SN74AVC2T45 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, designed specifically for ultra-low-voltage bidirectional level translation in portable, high-density, and energy-efficient systems.
FAQ
What voltage ranges does the SN74AVC2T45DCUTG4 support on its VCCA and VCCB rails?
The SN74AVC2T45DCUTG4 supports independent supply voltages from 1.2V to 3.6V on both VCCA and VCCB. This enables translation between any pair of standard low-voltage domains - including 1.2V↔1.5V, 1.2V↔1.8V, 1.8V↔2.5V, and 1.8V↔3.3V - without external components. The device maintains full functionality and specified timing across the entire range.
How does the DIR pin control data direction in the SN74AVC2T45DCUTG4?
In the SN74AVC2T45DCUTG4, the DIR pin is referenced to VCCA. When DIR = LOW (≤0.35×VCCA), the B-port outputs drive the A bus (B→A mode). When DIR = HIGH (≥0.65×VCCA), the A-port outputs drive the B bus (A→B mode). There is no output-enable (OE) pin - direction control is the sole activation mechanism, and both ports remain input-active at all times.
Does the SN74AVC2T45DCUTG4 support partial-power-down operation?
Yes, the SN74AVC2T45DCUTG4 fully supports partial-power-down via its Ioff specification: when either VCCA or VCCB is at 0V, the Ioff circuitry limits off-state current to ±5 µA maximum, preventing damaging back-current flow between powered and unpowered rails. This feature is critical for hot-swap and dynamic power-gating applications.
What is the maximum data rate achievable with the SN74AVC2T45DCUTG4?
The maximum data rate for SN74AVC2T45DCUTG4 is 500 Mbps - specifically achievable in 1.8V-to-3.3V level-shifting configurations. Rates decrease with lower output voltages: 320 Mbps for <1.8V-to-3.3V or 1.8V-to-2.5V, 280 Mbps for 1.5V output, and 240 Mbps for 1.2V output. These values reflect guaranteed timing under recommended operating conditions.
Is the SN74AVC2T45DCUTG4 pin-compatible with other 2-bit transceivers in TI's portfolio?
No, the SN74AVC2T45DCUTG4 is not pin-compatible with alternatives like TXB0102 or SN74LVC2T45. Its VSSOP-8 (DCU) pinout assigns VCCA to Pin 1, GND to Pin 4, DIR to Pin 5, and VCCB to Pin 8 - a layout optimized for dual-rail decoupling and signal integrity. Substituting requires PCB redesign due to differing power, control, and I/O pin assignments.
SN74AVC2T45DCUTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- 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:
- Tri-State, Non-Inverted
- Data Rate:
- 500Mbps
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFSOP (0.091", 2.30mm Width)
SN74AVC2T45DCUTG4 FAQ
1.How can I place an order for SN74AVC2T45DCUTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC2T45DCUTG4 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 SN74AVC2T45DCUTG4 reliable?
The price and inventory of SN74AVC2T45DCUTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC2T45DCUTG4 is usually 5 days.
3.What payment methods are accepted for SN74AVC2T45DCUTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVC2T45DCUTG4 transactions.
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4.How is shipping managed for SN74AVC2T45DCUTG4?
SN74AVC2T45DCUTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVC2T45DCUTG4 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 SN74AVC2T45DCUTG4?
For technical support, including SN74AVC2T45DCUTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC2T45DCUTG4 requirements.
6.How does Aetrix verify that SN74AVC2T45DCUTG4 is sourced from the original manufacturer or authorized distributors?
All SN74AVC2T45DCUTG4 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 SN74AVC2T45DCUTG4 meets industry standards.
7.What is the process for return or replacement of SN74AVC2T45DCUTG4?
All SN74AVC2T45DCUTG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC2T45DCUTG4, 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 SN74AVC2T45DCUTG4 part is unused and in its original packaging.
Return procedure for SN74AVC2T45DCUTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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