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Texas Instruments SN74AVC1T45DCKRE4
- Part No.:
- SN74AVC1T45DCKRE4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVC1T45DCKRE4.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL SC70-6
- 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-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, ±12mA drive at 3.3V, 4.6V I/O tolerance, and 500Mbps max data rate (1.8V→3.3V). It serves in low-voltage interconnects between SoCs and peripherals in space-constrained portable electronics.
For engineers reviewing the SN74AVC1T45 datasheet, SN74AVC1T45 pinout, SN74AVC1T45 application, or SN74AVC1T45 equivalent, this page delivers verified electrical specs, NanoFree™ SOT-SC70 package details, DIR-controlled direction logic, VCC isolation behavior, and real-world level-shifting use cases - all grounded in TI's SCES530L production datasheet (Jan 2026 revision).
Technical Context
The SN74AVC1T45 implements a noninverting, dual-rail translation 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.
VCC isolation forces both ports into high-impedance when either VCCA or VCCB = GND; Ioff circuitry disables outputs during partial power-down to prevent backflow current. Propagation delays range from 2.4ns (A→B, VCCA=1.2V/VCCB=3.3V) to 6.9ns (DIR→A, VCCA=1.5V/VCCB=1.2V), with enable/disable times derived from cascaded delay paths per TI's published formulas.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V each - enables universal translation across 1.2/1.5/1.8/2.5/3.3V nodes without external biasing |
| Max Data Rate | 500Mbps (1.8V→3.3V) - supports high-speed interfaces like SDIO, eMMC, or low-latency sensor links |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with legacy 3.3V or 5V systems without clamping diodes |
| Output Drive | ±12mA at 3.3V - sufficient to drive 50Ω transmission lines or multiple CMOS loads |
| VCC Isolation | Active when either VCCA or VCCB = GND - prevents bus contention during power sequencing |
| Ioff Support | Enables partial-power-down mode - blocks damaging back-current when one rail is unpowered |
| ESD Rating | ±2000V HBM - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
SN74AVC1T45 is packaged in the Texas Instruments NanoFree™ DCK (SOT-SC70, 6-pin) package - die-as-package construction measuring 2.0mm × 2.1mm, optimized for ultra-small PCB footprints in portable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply rail | Power reference for A I/O and DIR input; sets VIH/VIL thresholds for control signals |
| GND | Ground reference | Common return path for both supply domains; required for stable noise margin |
| A | Bidirectional I/O (A side) | Signal terminal referenced to VCCA; functions as input or output depending on DIR state |
| B | Bidirectional I/O (B side) | Signal terminal referenced to VCCB; mirrors A functionality with independent voltage domain |
| DIR | Direction control input | Logic-high enables A→B transmission; logic-low enables B→A; referenced only to VCCA |
| VCCB | B-port supply rail | Power reference for B I/O; independent of VCCA, enabling asymmetric voltage translation |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail configurability | Independent 1.2–3.6V operation on VCCA and VCCB enables any-to-any low-voltage translation without redesign |
| VCC isolation | Automatic high-Z on both ports if either VCCA or VCCB is grounded - eliminates need for external power-good sequencing logic |
| NanoFree™ packaging | DCK (SOT-SC70) footprint (2.0×2.1mm) reduces board area by >50% vs. standard SOT-23 while maintaining thermal performance |
| Ioff partial-power-down | Sub-µA leakage (<±0.1µA) when unpowered - preserves system-level power integrity in battery-critical applications |
| 4.6V-tolerant I/Os | Allows direct connection to 3.3V buses even when VCCA/VCCB = 1.2V - removes level-shifter cascading in mixed-voltage systems |
Applications
| Mobile Processor Interfacing | Industrial Sensor Hub |
|---|---|
Use Scenario: Connecting a 1.2V application processor I/O bank to a 3.3V UART peripheral in a handheld medical device. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing signal flow direction via processor-controlled DIR line; propagation delay ≤2.8ns ensures timing compliance at 25MHz UART. Use Value: Eliminates discrete resistor-divider or active translator solutions, reducing BOM count and layout complexity while supporting hot-plug-safe power sequencing. | Use Scenario: Interfacing a 1.8V microcontroller to multiple 2.5V analog sensor ICs in a factory-floor environmental monitor. IC Role / Device Role / Timing Role: Unidirectional translator (DIR fixed) converting MCU GPIO outputs to sensor enable/control lines; 4.6V I/O tolerance prevents latch-up during ESD events near machinery. Use Value: Enables robust communication without external TVS diodes or voltage translators, meeting IEC 61000-4-2 Level 3 immunity requirements out-of-box. |
| Wearable Battery Management | Enterprise SSD Controller Interface |
Use Scenario: Level-shifting between a 1.5V fuel-gauge IC and a 3.3V PMIC in an ultra-thin smartwatch. IC Role / Device Role / Timing Role: Low-quiescent translator operating in partial-power-down (Ioff active) during sleep mode; VCC isolation prevents current leakage when fuel-gauge rail is powered down. Use Value: Extends battery runtime by minimizing standby current (<1µA total ICC) while maintaining fast wake-up response (<7ns enable time). | Use Scenario: Translating command/address signals from a 1.8V NVMe controller to 2.5V DRAM buffers in an enterprise SSD module. IC Role / Device Role / Timing Role: High-speed bidirectional translator supporting 500Mbps burst transfers; matched tPLH/tPHL delays ensure setup/hold timing closure across voltage domains. Use Value: Achieves PCIe Gen3-compatible signaling integrity without adding jitter or skew - validated per JEDEC JESD22-A114A HBM testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1T45DBVR | Single-supply (1.65–5.5V), no VCC isolation, lower max speed (420Mbps), SOT-23-6 package (2.9×2.8mm) | Requires shared VCC; unsuitable for asymmetric power sequencing or true partial-power-down | Select when cost sensitivity outweighs VCC isolation need and board space permits larger SOT-23 footprint |
| TXS0101DCKR | Auto-direction sensing (no DIR pin), lower drive (±2mA), 1.65–3.6V VCCA/VCCB, 60Mbps max | Eliminates DIR control logic but lacks high-speed capability and robust ESD (±15kV HBM) | Select for simple push-pull bus interfaces where direction changes infrequently and speed <100Mbps suffices |
Compared with SN74LVC1T45DBVR and TXS0101DCKR, the SN74AVC1T45 uniquely combines dual-rail flexibility, VCC isolation, 500Mbps throughput, and NanoFree™ packaging - making it the only choice for space-constrained, high-reliability, multi-rail embedded systems requiring guaranteed power-sequence independence.
Availability
SN74AVC1T45 is available at Aetrix Electronics and suitable for mobile processor interfacing, industrial sensor hubs, wearable battery management, and enterprise SSD controller interfaces requiring stable component supply, long-term lifecycle support, 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 delivering analog and embedded processing solutions, with leadership in precision analog, power management, and high-performance logic.
The SN74AVC1T45 belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional translation in portable, battery-powered, and space-constrained systems where power sequencing robustness and minimal footprint are critical.
FAQ
What is the minimum operating voltage for SN74AVC1T45 on both VCCA and VCCB rails?
The SN74AVC1T45 supports a minimum supply voltage of 1.2V on both VCCA and VCCB rails, as specified in TI's SCES530L datasheet Section 5.3. This enables reliable operation in deep-sleep modes of modern ultra-low-power processors and sensors, with full functionality including Ioff and VCC isolation maintained down to 1.2V.
Can SN74AVC1T45 translate between 1.2V and 3.3V in both directions, and what is the typical propagation delay?
Yes, SN74AVC1T45 supports bidirectional translation between 1.2V and 3.3V. At VCCA = 1.2V and VCCB = 3.3V, typical A→B propagation delay (tPLH/tPHL) is 2.4ns (Section 5.6), and B→A is 2.7ns. These values are measured under 15pF load and 10MHz conditions, confirming suitability for sub-400MHz digital interfaces.
How does the VCC isolation feature behave if VCCA is powered but VCCB is disconnected?
If VCCB is disconnected (i.e., floating or at GND), the VCC isolation feature forces both A and B ports into high-impedance state - regardless of DIR or input logic levels. This behavior is guaranteed per Section 7.3.1 and prevents bus contention or back-driving during power-up/down sequences, a key reliability advantage over single-supply translators.
Is SN74AVC1T45 compatible with 5V-tolerant systems?
No - SN74AVC1T45 I/Os are rated for 4.6V maximum (Section 5.1), not 5V. While 4.6V tolerance safely covers 3.3V systems with overshoot, direct connection to 5V buses risks damage. For 5V interface, TI recommends SN74AVCH series or discrete protection; SN74AVC1T45 must be used only within its 1.2–3.6V supply and ≤4.6V I/O voltage limits.
What package variant does SN74AVC1T45DCKRE4 correspond to, and what are its dimensions?
SN74AVC1T45DCKRE4 uses the DCK package: a 6-pin SOT-SC70 (NanoFree™) measuring 2.0mm × 2.1mm (Section 11, Package Information). This die-as-package construction eliminates leadframe, reducing thickness and thermal resistance versus standard SOT-23, and is optimized for high-density portable PCB layouts.
SN74AVC1T45DCKRE4 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:
- 6-TSSOP, SC-88, SOT-363
SN74AVC1T45DCKRE4 FAQ
1.How can I place an order for SN74AVC1T45DCKRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC1T45DCKRE4 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 SN74AVC1T45DCKRE4 reliable?
The price and inventory of SN74AVC1T45DCKRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC1T45DCKRE4 is usually 5 days.
3.What payment methods are accepted for SN74AVC1T45DCKRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVC1T45DCKRE4 transactions.
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4.How is shipping managed for SN74AVC1T45DCKRE4?
SN74AVC1T45DCKRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVC1T45DCKRE4 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 SN74AVC1T45DCKRE4?
For technical support, including SN74AVC1T45DCKRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC1T45DCKRE4 requirements.
6.How does Aetrix verify that SN74AVC1T45DCKRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AVC1T45DCKRE4 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 SN74AVC1T45DCKRE4 meets industry standards.
7.What is the process for return or replacement of SN74AVC1T45DCKRE4?
All SN74AVC1T45DCKRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC1T45DCKRE4, 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 SN74AVC1T45DCKRE4 part is unused and in its original packaging.
Return procedure for SN74AVC1T45DCKRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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