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Texas Instruments SN74AVC2T45DCUTE4
- Part No.:
- SN74AVC2T45DCUTE4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVC2T45DCUTE4.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,371
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Product details
Overview
SN74AVC2T45 from Texas Instruments is a 2-bit dual-supply bus transceiver enabling bidirectional level-shifting between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V voltage 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 serves in high-speed interconnects between heterogeneous logic domains in compact portable electronics.
For engineers reviewing the SN74AVC2T45 datasheet, SN74AVC2T45 pinout, SN74AVC2T45 application, or SN74AVC2T45 equivalent, key selection criteria include configurable dual-rail operation, DIR-controlled directionality, sub-6ns propagation delay across voltage combinations, 500Mbps max data rate (1.8V→3.3V), and NanoFree™ DCT package compatibility with space-constrained PCB layouts.
Technical Context
The SN74AVC2T45 implements a CMOS-based dual-rail architecture where A-port I/Os track VCCA and B-port I/Os track VCCB, enabling true bidirectional voltage translation without external biasing. Direction control is managed solely by the DIR input referenced to VCCA - low enables B→A transmission, high enables A→B transmission.
Its VCC isolation function forces both ports into high-impedance when either VCCA or VCCB = GND, preventing bus contention during power sequencing. The Ioff specification (±5µA max at 3.6V) ensures safe back-drive immunity during partial power-down, critical for hot-plug and multi-rail system reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Range | 1.2V to 3.6V - powers A-port I/Os and DIR input; sets A-side logic thresholds and output swing. |
| VCCB Range | 1.2V to 3.6V - powers B-port I/Os; defines B-side input thresholds and output voltage levels. |
| Max Data Rate | 500Mbps - achievable only in 1.8V→3.3V translation; confirms suitability for high-throughput inter-die or SoC-to-peripheral links. |
| tPLH/tPHL (A→B) | 2.4ns typical (VCCA=3.3V, VCCB=3.3V) - enables <417MHz clocked data transfer with timing margin. |
| I/O Overvoltage | 4.6V tolerant - allows safe interfacing with legacy 5V-tolerant systems without external clamping diodes. |
| Ioff Current | ±5µA max (TA = –40°C to 85°C) - guarantees no damaging back-current flow when one supply is off. |
| ESD Rating | ±8kV HBM - meets industrial-grade robustness requirements for handheld and server board handling. |
Pinout & Package
The SN74AVC2T45DCUTE4 uses the DCT (SSOP-8) package: 2.95mm × 2.80mm body, 0.65mm pitch, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | Supply rail A | Power source for A-port I/Os and DIR input; determines A-side logic thresholds and output voltage compliance. |
| VCCB | Supply rail B | Power source for B-port I/Os; defines B-side input switching points and output drive capability. |
| GND | Ground reference | Common return path for both supplies; required for stable noise margin and ESD current discharge. |
| A1, A2 | Bidirectional I/O (A side) | Data terminals tied to VCCA domain; direction determined by DIR state; always active inputs requiring defined logic level. |
| B1, B2 | Bidirectional I/O (B side) | Data terminals tied to VCCB domain; direction determined by DIR state; must not float to avoid CMOS leakage. |
| DIR | Direction control input | Active-high signal referenced to VCCA; low = B→A data flow, high = A→B data flow; no OE pin required. |
Key Features
| Feature | Design Value |
|---|---|
| Dual configurable supply rails | Independent VCCA and VCCB (1.2–3.6V each) enable arbitrary low-voltage node bridging without external level-shifters. |
| VCC isolation | Automatic Hi-Z on both ports if either VCCA or VCCB = GND - eliminates bus contention during asymmetric power-up/down sequences. |
| Ioff partial-power-down | Sub-5µA off-state current prevents back-driving damage when one supply is inactive - essential for hot-swap and battery-backed subsystems. |
| 4.6V I/O tolerance | Withstands transient overvoltage up to 4.6V on any I/O regardless of VCCA/VCCB - removes need for discrete protection components. |
| NanoFree™ packaging | DCT package uses die-as-package construction - reduces footprint by >30% vs. standard SSOP, improves thermal resistance (RθJA = 183.1°C/W). |
Applications
| Smartphone Baseband–PMIC Interface | Server Memory Subsystem Bridging |
|---|---|
Use Scenario: Interfacing 1.2V/1.8V application processor GPIOs with 3.3V PMIC control lines in ultra-thin smartphone designs. IC Role / Device Role / Timing Role: Bidirectional level translator managing command/response traffic between voltage-isolated domains with sub-3ns propagation delay. Use Value: Eliminates discrete resistor-divider networks and saves >1.2mm² PCB area per channel while maintaining JESD78 Class II latch-up immunity. | Use Scenario: Connecting 1.5V DDR4 memory controller signals to 3.3V thermal sensor and SPD EEPROM in enterprise servers. IC Role / Device Role / Timing Role: Asynchronous bus transceiver enabling reliable read/write access across mixed-voltage memory subsystems. Use Value: Supports 500Mbps burst transfers with guaranteed 2.4ns tPLH (3.3V→3.3V), meeting JEDEC timing margins for SMBus-compatible interfaces. |
| Notebook Display Interface Translation | Industrial IoT Sensor Hub Aggregation |
Use Scenario: Level-shifting eDP AUX CH signals between 1.8V GPU core and 2.5V display timing controller in 13" ultrabooks. IC Role / Device Role / Timing Role: Dual-channel translator operating in unidirectional mode (DIR fixed) for low-latency auxiliary channel communication. Use Value: Delivers 2.6ns typical tPLH (1.8V→2.5V) and 4.6V I/O tolerance - withstands panel cable ESD events without protection diodes. | Use Scenario: Aggregating 1.2V sensor outputs (accelerometer, humidity) to 3.3V microcontroller UART in battery-powered edge nodes. IC Role / Device Role / Timing Role: Low-quiescent translator enabling always-on sensing with Ioff <5µA during MCU sleep states. Use Value: Reduces system standby current by >10µA vs. discrete FET solutions while supporting 1.2V–3.3V translation without external bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2T45DCUR | Lower max data rate (420Mbps), higher ICCA+ICCB (20µA vs. 20µA typ but tighter spec), identical pinout and VCC range. | Marginally lower speed; suitable where 500Mbps headroom is unnecessary and cost sensitivity dominates. | Prefer SN74AVC2T45DCUTE4 for designs requiring >450Mbps or tighter static power control at 1.2V operation. |
| TXS0102DCUR | No DIR pin - auto-sensing direction; higher propagation delay (≥6.5ns); supports 1.65–5.5V VCCA/VCCB; lacks VCC isolation. | Eliminates direction control logic but adds latency; unsuitable for systems requiring strict power-sequence independence. | Choose SN74AVC2T45DCUTE4 when deterministic DIR control, VCC isolation, or sub-3ns delay is mandatory. |
Compared with SN74LVC2T45DCUR and TXS0102DCUR, the SN74AVC2T45DCUTE4 delivers the highest verified data rate (500Mbps), lowest propagation delay across all voltage pairs, and unique VCC isolation - making it optimal for high-reliability, space-constrained, multi-rail portable and server platforms.
Availability
SN74AVC2T45DCUTE4 is available at Aetrix Electronics and suitable for smartphone baseband interfaces, server memory subsystems, notebook display links, and industrial sensor hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74AVC2T45DCUTE4 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 personal electronics markets.
The SN74AVC2T45 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional level translation in space- and power-constrained portable and computing systems.
FAQ
What voltage ranges does the SN74AVC2T45DCUTE4 support on its VCCA and VCCB supplies?
The SN74AVC2T45DCUTE4 supports 1.2V to 3.6V independently on both VCCA and VCCB. This allows translation between any pair of standard low-voltage nodes - including 1.2V↔1.5V, 1.2V↔1.8V, 1.8V↔2.5V, 1.8V↔3.3V, and 2.5V↔3.3V - without external components. Operation outside this range violates absolute maximum ratings and may cause permanent damage to the SN74AVC2T45DCUTE4.
How does the DIR pin control data direction in the SN74AVC2T45DCUTE4?
The DIR pin is a single active-high control input referenced to VCCA. When DIR = LOW (≤0.35×VCCA), the B-port drivers are enabled and A-port drivers are in high-impedance - enabling data flow from B to A. When DIR = HIGH (≥0.65×VCCA), the A-port drivers are enabled and B-port drivers go Hi-Z - enabling data flow from A to B. The SN74AVC2T45DCUTE4 has no OE pin; direction is exclusively controlled by DIR, and both A and B ports remain input-active at all times.
Does the SN74AVC2T45DCUTE4 support partial power-down, and how is it implemented?
Yes, the SN74AVC2T45DCUTE4 fully supports partial power-down via its Ioff specification. When either VCCA or VCCB is at 0V while the other remains powered, the Ioff circuitry disables all outputs, limiting off-state current to ±5µA max over temperature. This prevents damaging back-current flow through the device - a critical feature for hot-plug interfaces and battery-backed subsystems where supply sequencing is uncontrolled. The SN74AVC2T45DCUTE4 maintains this behavior across its full operating temperature range (–40°C to +85°C).
What is the maximum data rate supported by the SN74AVC2T45DCUTE4, and under what conditions?
The SN74AVC2T45DCUTE4 achieves a maximum data rate of 500Mbps, specified only for 1.8V→3.3V level-shifting. Other combinations yield lower rates: 320Mbps for <1.8V→3.3V or level-shifting to 2.5V/1.8V, 280Mbps to 1.5V, and 240Mbps to 1.2V. These values reflect guaranteed AC performance under recommended operating conditions - not theoretical limits. Real-world throughput of the SN74AVC2T45DCUTE4 depends on PCB layout, load capacitance, and signal integrity; design validation is required for >300Mbps operation.
Is the SN74AVC2T45DCUTE4 pin-compatible with other 2-bit transceivers in TI's portfolio?
Yes, the SN74AVC2T45DCUTE4 in the DCT (SSOP-8) package shares identical pinout and footprint with SN74LVC2T45DCUR, SN74LVCH2T45DCUR, and SN74AVCH2T45DCUR. All use the same 8-pin SM8 configuration: VCCA–A1–A2–GND–DIR–B2–B1–VCCB. This enables drop-in replacement within the same package variant, provided voltage, speed, and Ioff requirements are met. However, the SN74AVC2T45DCUTE4 is not pin-compatible with TXS0102DCUR (different pin mapping) or devices in DCU/VSSOP or YZP/DSBGA packages.
SN74AVC2T45DCUTE4 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)
SN74AVC2T45DCUTE4 FAQ
1.How can I place an order for SN74AVC2T45DCUTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC2T45DCUTE4 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 SN74AVC2T45DCUTE4 reliable?
The price and inventory of SN74AVC2T45DCUTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC2T45DCUTE4 is usually 5 days.
3.What payment methods are accepted for SN74AVC2T45DCUTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVC2T45DCUTE4 transactions.
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4.How is shipping managed for SN74AVC2T45DCUTE4?
SN74AVC2T45DCUTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVC2T45DCUTE4 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 SN74AVC2T45DCUTE4?
For technical support, including SN74AVC2T45DCUTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC2T45DCUTE4 requirements.
6.How does Aetrix verify that SN74AVC2T45DCUTE4 is sourced from the original manufacturer or authorized distributors?
All SN74AVC2T45DCUTE4 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 SN74AVC2T45DCUTE4 meets industry standards.
7.What is the process for return or replacement of SN74AVC2T45DCUTE4?
All SN74AVC2T45DCUTE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC2T45DCUTE4, 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 SN74AVC2T45DCUTE4 part is unused and in its original packaging.
Return procedure for SN74AVC2T45DCUTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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