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Texas Instruments SN74AVC1T45DBVRE4
- Part No.:
- SN74AVC1T45DBVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVC1T45DBVRE4.pdf
- Description:
- IC TRANSLATOR BIDIR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,861
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Product details
Overview
SN74AVC1T45 from Texas Instruments is a single-bit dual-supply 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, ±12mA drive at 3.3V, 4.6V I/O tolerance, and VCC isolation for robust power sequencing - deployed in low-voltage interconnects between SoCs and peripherals.
For engineers reviewing the SN74AVC1T45 datasheet, SN74AVC1T45 pinout, SN74AVC1T45 application, or SN74AVC1T45 equivalent, key selection criteria include configurable dual-rail operation, Ioff partial-power-down support, DIR-controlled directionality, high-speed translation up to 500Mbps (1.8V→3.3V), and NanoFree™ SOT-23 package compatibility with space-constrained PCB layouts.
Technical Context
The SN74AVC1T45 implements a noninverting, dual-supply architecture where A-port logic levels track VCCA and B-port levels track VCCB. Direction control (DIR) is referenced solely to VCCA, ensuring deterministic switching regardless of VCCB state.
Its VCC isolation function forces both ports into high-impedance when either VCCA or VCCB = GND, preventing backdrive during power-up/down sequences. The Ioff circuitry disables outputs during partial power-down, blocking damaging current flow between powered and unpowered system domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V each - enables universal translation across 1.2V/1.5V/1.8V/2.5V/3.3V nodes without external level-shifters |
| Max Data Rate | 500Mbps (1.8V→3.3V) - supports high-speed interfaces like UART, I²C, SPI, and GPIO expansion in portable electronics |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with legacy 3.3V or 5V systems without clamping diodes or resistors |
| Output Drive | ±12mA at 3.3V - sufficient to drive 50Ω transmission lines or multiple CMOS loads with controlled edge rates |
| Propagation Delay | 2.8ns (A→B, VCCA=3.3V, VCCB=3.3V) - ensures timing-critical bidirectional data paths meet sub-5ns budget constraints |
| ESD Protection | ±2000V HBM - meets industrial-grade ESD immunity requirements for handheld and enterprise equipment |
| Ioff Current | ±0.1µA max - guarantees negligible leakage during partial power-down, preserving battery life in always-on subsystems |
Pinout & Package
SN74AVC1T45DBVRE4 uses the DBV (SOT-23-6) package: 2.9mm × 2.8mm footprint, 6-pin surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | Power source for A-port I/O and DIR input - must be stable before asserting DIR or A signals |
| GND | Ground reference | Common return path for both supply rails; requires low-inductance connection to minimize ground bounce |
| A | Bidirectional I/O (A side) | Signal terminal referenced to VCCA; accepts 1.2–3.6V logic; tolerant to 4.6V inputs |
| B | Bidirectional I/O (B side) | Signal terminal referenced to VCCB; accepts 1.2–3.6V logic; tolerant to 4.6V inputs |
| DIR | Direction control input | Logic-level signal referenced to VCCA only - high enables A→B, low enables B→A |
| VCCB | B-port supply rail | Power source for B-port I/O - independent of VCCA, enabling asymmetric voltage translation |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.2–3.6V operation on VCCA and VCCB enables interoperability between mixed-voltage SoCs, FPGAs, and sensors |
| VCC isolation | Automatic high-Z on both ports if either VCCA or VCCB = GND - eliminates need for external power-good sequencing logic |
| Ioff partial-power-down | Blocks current backflow when one rail is unpowered - critical for hot-swap and battery-backed subsystems |
| NanoFree™ packaging | Dies-as-package construction reduces parasitic inductance and thermal resistance - improves signal integrity and power efficiency |
| 4.6V I/O tolerance | Allows direct connection to 3.3V or 5V buses without external protection - simplifies BOM and layout |
Applications
| Mobile Device Interface | Industrial Sensor Hub |
|---|---|
Use Scenario: Interfacing a 1.8V application processor GPIO bank to a 3.3V camera module in smartphones or tablets. IC Role / Device Role / Timing Role: Bidirectional level translator managing control and status signals with sub-5ns propagation delay. Use Value: Eliminates discrete resistor-divider networks while supporting 500Mbps burst-mode data handshaking. | Use Scenario: Connecting a 1.2V microcontroller ADC interface to 2.5V analog sensor outputs in factory automation nodes. IC Role / Device Role / Timing Role: Unidirectional voltage translator isolating low-power MCU domain from higher-voltage sensor domain. Use Value: Prevents cross-domain leakage via Ioff, enabling <1µA sleep current in battery-powered edge nodes. |
| Enterprise SSD Controller | Telecom Baseband FPGA |
Use Scenario: Level-shifting between a 1.5V NVMe controller and 3.3V PCIe hot-plug detection circuitry. IC Role / Device Role / Timing Role: Dual-supply transceiver providing VCC isolation during PCIe link retraining sequences. Use Value: Guarantees bus high-Z during VCCB ramp-up, avoiding contention on shared presence-detect lines. | Use Scenario: Translating JTAG debug signals between a 1.8V FPGA core and 2.5V boundary-scan test infrastructure. IC Role / Device Role / Timing Role: Low-capacitance (6pF) bidirectional translator preserving signal rise/fall times under 1ns/V slew rate. Use Value: Maintains JTAG timing margins at 25MHz clock rates without added termination or buffering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1T45DBVR | Lower max VCC range (1.65–5.5V); no VCC isolation; 32mA drive at 3.3V | Not suitable for asymmetric 1.2V/3.3V translation or partial-power-down systems | Select when higher drive strength is needed and both rails operate ≥1.65V |
| TXS0101DCKR | Auto-direction sensing (no DIR pin); lower max speed (60Mbps); integrated 10kΩ pullups | Eliminates direction-control logic but limits data rate and adds static current in high-Z state | Select for simple unidirectional GPIO expansion where DIR routing is constrained |
Compared with SN74LVC1T45DBVR and TXS0101DCKR, SN74AVC1T45DBVRE4 uniquely supports 1.2V operation, VCC isolation, and 500Mbps translation - making it the only choice for ultra-low-voltage, safety-critical power sequencing in portable and industrial designs.
Availability
SN74AVC1T45DBVRE4 is available at Aetrix Electronics and suitable for mobile device interface, industrial sensor hub, enterprise SSD controller, and telecom baseband FPGA applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74AVC1T45DBVRE4 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, with leadership in precision analog, power management, and high-performance computing.
SN74AVC1T45 belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family, engineered specifically for bidirectional voltage translation in battery-powered, space-constrained, and mixed-voltage digital systems.
FAQ
What is the minimum operating voltage for SN74AVC1T45DBVRE4 on each supply rail?
The SN74AVC1T45DBVRE4 supports VCCA and VCCB down to 1.2V independently. This 1.2V minimum enables direct interfacing with advanced ultra-low-power microcontrollers and memory devices that operate at sub-1.5V logic thresholds, unlike older LVC-family translators limited to 1.65V.
How does the VCC isolation feature work in SN74AVC1T45DBVRE4?
The VCC isolation feature in SN74AVC1T45DBVRE4 forces both A and B ports into high-impedance when either VCCA or VCCB is at GND. This prevents back-driving between powered and unpowered domains during power-up/down sequences - a critical safeguard in systems with staggered rail sequencing.
Can SN74AVC1T45DBVRE4 translate between 1.2V and 3.3V in both directions?
Yes, SN74AVC1T45DBVRE4 supports bidirectional translation between 1.2V and 3.3V. When VCCA = 1.2V and VCCB = 3.3V, it translates B→A at 240Mbps; when VCCA = 3.3V and VCCB = 1.2V, it translates A→B at the same rate - confirmed in Section 5.10 of the official datasheet.
What is the role of the DIR pin in SN74AVC1T45DBVRE4, and how is it powered?
The DIR pin in SN74AVC1T45DBVRE4 controls data direction: high enables A→B, low enables B→A. Critically, DIR is powered exclusively by VCCA - not VCCB - ensuring reliable direction control even when VCCB is unpowered or unstable during system boot.
Does SN74AVC1T45DBVRE4 support partial-power-down mode, and how is it implemented?
Yes, SN74AVC1T45DBVRE4 supports partial-power-down via its Ioff circuitry. When either VCCA or VCCB is at 0V, the Ioff feature disables all I/O outputs, limiting leakage current to ±0.1µA - protecting downstream components and preserving battery charge in always-on subsystems.
SN74AVC1T45DBVRE4 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:
- 1
- 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:
- SOT-23-6
SN74AVC1T45DBVRE4 FAQ
1.How can I place an order for SN74AVC1T45DBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC1T45DBVRE4 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 SN74AVC1T45DBVRE4 reliable?
The price and inventory of SN74AVC1T45DBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC1T45DBVRE4 is usually 5 days.
3.What payment methods are accepted for SN74AVC1T45DBVRE4?
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SN74AVC1T45DBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVC1T45DBVRE4 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 SN74AVC1T45DBVRE4?
For technical support, including SN74AVC1T45DBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC1T45DBVRE4 requirements.
6.How does Aetrix verify that SN74AVC1T45DBVRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AVC1T45DBVRE4 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 SN74AVC1T45DBVRE4 meets industry standards.
7.What is the process for return or replacement of SN74AVC1T45DBVRE4?
All SN74AVC1T45DBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC1T45DBVRE4, 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 SN74AVC1T45DBVRE4 part is unused and in its original packaging.
Return procedure for SN74AVC1T45DBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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