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Texas Instruments SN74AVC1T45DRLR
- Part No.:
- SN74AVC1T45DRLR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVC1T45DRLR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL SOT5X3
- Quantity:
- Payment:
- Shipping:
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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 domains with ±12mA drive at 3.3V, 4.6V I/O tolerance, and VCC isolation. It serves as a level-shifting interface in mixed-voltage SoC interconnects, FPGA-to-peripheral links, and low-power sensor hubs.
For engineers reviewing the SN74AVC1T45 datasheet, SN74AVC1T45 pinout, SN74AVC1T45 application, or SN74AVC1T45 equivalent, key selection criteria include configurable dual-rail operation (VCCA/VCCB = 1.2V–3.6V), 500Mbps max data rate (1.8V→3.3V), Ioff partial-power-down support, DIR-controlled directionality, and NanoFree™ SOT-5X3 package compatibility.
Technical Context
The SN74AVC1T45 implements asynchronous bidirectional translation via a DIR-controlled noninverting transceiver architecture: high DIR enables A→B transmission; low DIR enables B→A transmission. Both A and B ports feature independent supply rails (VCCA and VCCB), each supporting 1.2V–3.6V, with input circuits referenced to their respective VCC.
VCC isolation ensures both ports enter high-impedance state if either VCCA or VCCB is grounded. Ioff circuitry disables outputs during partial power-down to prevent backflow current, while 4.6V-tolerant I/Os allow safe interfacing with higher-voltage systems without external protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA / VCCB) | 1.2V to 3.6V per rail - enables translation across all common low-voltage nodes (1.2V/1.5V/1.8V/2.5V/3.3V) without level-shifters. |
| Max Data Rate | 500Mbps (1.8V→3.3V) - supports high-speed interfaces like SDIO, I²C fast-mode+, and low-latency sensor data links. |
| I/O Voltage Tolerance | ±4.6V - allows safe connection to 5V-tolerant buses or legacy peripherals without clamping diodes. |
| Output Drive Strength | ±12mA at 3.3V - sufficient to drive 50Ω transmission lines or multiple CMOS loads with controlled edge rates. |
| Propagation Delay (tPLH/tPHL) | 2.8ns typical (A→B, VCCA=3.3V, VCCB=3.3V) - ensures sub-3ns timing for real-time control loops and synchronous data capture. |
| ESD Protection | ±2000V HBM, ±1000V CDM - meets industrial-grade robustness requirements for handheld and field-deployable equipment. |
| Ioff Current | ±0.1µA max - guarantees negligible leakage during system sleep states, critical for battery-powered IoT endpoints. |
Pinout & Package
SN74AVC1T45 is packaged in the Texas Instruments NanoFree™ DRL (SOT-5X3, 6-pin) package measuring 1.6mm × 1.6mm - die-as-package construction minimizes parasitic inductance and footprint for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | Power supply for A port and DIR input | References A-port I/O thresholds and DIR logic levels; must be stable before signal assertion. |
| GND | Common ground reference | Single ground plane required; no separate analog/digital GND - simplifies PCB layout. |
| A | Bidirectional I/O referenced to VCCA | Connects to 1.2V–3.6V source domain; accepts weak pull-up/down to avoid floating states. |
| B | Bidirectional I/O referenced to VCCB | Connects to 1.2V–3.6V sink domain; voltage-tolerant design eliminates need for external clamps. |
| DIR | Direction control input (active-high) | Logic level referenced to VCCA; controls data flow path (A→B when HIGH, B→A when LOW). |
| VCCB | Power supply for B port | Independent of VCCA - enables true dual-rail operation and voltage domain isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail supply | VCCA and VCCB independently set from 1.2V to 3.6V - eliminates need for external regulators or LDOs in multi-voltage systems. |
| VCC isolation | Both ports auto-enter high-Z if either VCCA or VCCB = GND - prevents bus contention during power sequencing or fault conditions. |
| Ioff partial-power-down support | Outputs disabled with <±0.1µA leakage when VCCA or VCCB = 0V - essential for zero-power retention in battery-backed subsystems. |
| NanoFree™ packaging | DRL (SOT-5X3) package uses bare die as package - reduces thermal resistance (RθJA = 236.2°C/W) and board area by >40% vs. SOT-23. |
| 4.6V I/O tolerance | Withstands overvoltage on A/B pins up to 4.6V regardless of VCCA/VCCB - enables direct interface with 5V logic without level-shifter ICs. |
Applications
| Mobile Sensor Hub Interface | Industrial PLC I/O Module |
|---|---|
Use Scenario: Interfacing a 1.8V MEMS sensor array to a 3.3V microcontroller ADC input in a wearable health monitor. IC Role / Device Role / Timing Role: Bidirectional voltage translator handling SPI clock/data lines with DIR toggled per command sequence. Use Value: Eliminates discrete resistor-divider networks; maintains 500Mbps timing margin for burst-mode sensor streaming at 10kHz sample rate. |
Use Scenario: Connecting a 2.5V FPGA configuration interface to 3.3V industrial Ethernet PHY registers. IC Role / Device Role / Timing Role: Unidirectional level shifter (fixed DIR) translating JTAG TCK/TMS signals with sub-3ns propagation delay. Use Value: Ensures setup/hold compliance across voltage domains; 4.6V tolerance prevents latch-up during ESD events on factory-floor wiring. |
| Automotive Body Control Unit | Enterprise SSD Controller Link |
Use Scenario: Isolating 1.2V automotive MCU GPIOs from 1.8V CAN transceiver status lines in a door module. IC Role / Device Role / Timing Role: Dual-rail translator with VCC isolation ensuring safe shutdown when VCCA drops during ignition cycle. Use Value: Prevents backfeed into MCU during brownout; Ioff leakage <0.1µA extends battery reserve time during vehicle sleep mode. |
Use Scenario: Bridging 1.5V NVMe controller signals to 3.3V PCIe switch management I²C bus in enterprise storage arrays. IC Role / Device Role / Timing Role: High-speed bidirectional translator supporting 1MHz I²C fast-mode+ with DIR synchronized to firmware polling cycles. Use Value: Enables hot-plug detection without protocol stalls; 500Mbps headroom accommodates future 3.4MHz I³C migration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0101DGSR | Auto-direction sensing (no DIR pin); lower drive (±4mA); 1.65V–5.5V range | Suitable for I²C/SMBus where direction is data-driven; not for DIR-controlled protocols like SPI | Select when eliminating control logic overhead is prioritized over precise timing control. |
| SN74LVC1T45DBVR | Single-supply (VCC only); 1.65V–5.5V range; no VCC isolation; 3.3V max I/O tolerance | Limited to same-voltage-domain translation; lacks partial-power-down and overvoltage robustness | Choose only for cost-sensitive, single-rail designs where 4.6V tolerance and Ioff are unnecessary. |
Compared with TXB0101DGSR and SN74LVC1T45DBVR, SN74AVC1T45 uniquely delivers DIR-controlled bidirectionality with 4.6V I/O tolerance, VCC isolation, and Ioff - making it the sole option for safety-critical, mixed-rail, or high-reliability level-shifting where deterministic control and fault resilience are mandatory.
Availability
SN74AVC1T45 is available at Aetrix Electronics and suitable for mobile sensor hubs, industrial PLC I/O modules, automotive body control units, and enterprise SSD controller links requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74AVC1T45 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 specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and interface solutions.
SN74AVC1T45 belongs to the AVC (Advanced Very-low-voltage CMOS) logic family, designed specifically for ultra-low-voltage bidirectional level translation in space- and power-constrained portable and industrial systems.
FAQ
What is the maximum supported data rate for SN74AVC1T45 in a 1.8V-to-3.3V translation scenario?
The SN74AVC1T45 supports up to 500Mbps when translating signals from 1.8V to 3.3V, as specified in the official Texas Instruments datasheet SCES530L. This performance is validated under recommended operating conditions with matched load capacitance and proper signal integrity layout. The SN74AVC1T45 achieves this using optimized internal driver strength and low-propagation-delay architecture.
Does SN74AVC1T45 require external pull-up resistors on the A or B ports?
No, SN74AVC1T45 does not require external pull-up resistors on A or B ports. Its input circuits include weak internal pulldowns to prevent floating states when external signals are undefined. However, external pull-ups may still be needed for open-drain bus protocols like I²C - but those serve protocol compliance, not SN74AVC1T45 functionality.
Can SN74AVC1T45 operate with VCCA = 1.2V and VCCB = 3.3V simultaneously?
Yes, SN74AVC1T45 is explicitly designed for asymmetric dual-rail operation: VCCA can be 1.2V while VCCB is 3.3V, enabling translation from ultra-low-power sensor domains to higher-voltage processing subsystems. The device maintains full functionality, including 4.6V I/O tolerance on the B port and guaranteed timing specs per the switching characteristics tables.
What happens to the outputs of SN74AVC1T45 if VCCA is powered down while VCCB remains active?
If VCCA is powered down (0V) while VCCB remains active, the VCC isolation feature forces both A and B ports into high-impedance state - preventing back-current flow and bus contention. This behavior is guaranteed per the functional description in Section 7.3.1 of the SN74AVC1T45 datasheet and is independent of DIR state.
Is the SN74AVC1T45 DRL package RoHS-compliant and lead-free?
Yes, the SN74AVC1T45 in the DRL (SOT-5X3) package is RoHS-compliant and lead-free, meeting JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements. Texas Instruments confirms Pb-free terminal finish and halogen-free molding compound for this variant, as documented in the official packaging information section of the SN74AVC1T45 product folder.
SN74AVC1T45DRLR 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:
- 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-563, SOT-666
SN74AVC1T45DRLR FAQ
1.How can I place an order for SN74AVC1T45DRLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC1T45DRLR 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 SN74AVC1T45DRLR reliable?
The price and inventory of SN74AVC1T45DRLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC1T45DRLR is usually 5 days.
3.What payment methods are accepted for SN74AVC1T45DRLR?
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4.How is shipping managed for SN74AVC1T45DRLR?
SN74AVC1T45DRLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVC1T45DRLR 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 SN74AVC1T45DRLR?
For technical support, including SN74AVC1T45DRLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC1T45DRLR requirements.
6.How does Aetrix verify that SN74AVC1T45DRLR is sourced from the original manufacturer or authorized distributors?
All SN74AVC1T45DRLR 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 SN74AVC1T45DRLR meets industry standards.
7.What is the process for return or replacement of SN74AVC1T45DRLR?
All SN74AVC1T45DRLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC1T45DRLR, 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 SN74AVC1T45DRLR part is unused and in its original packaging.
Return procedure for SN74AVC1T45DRLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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