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Texas Instruments 74AVC1T45DCKR
- Part No.:
- 74AVC1T45DCKR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
74AVC1T45DCKR.pdf
- Description:
- PROTOTYPE
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
74AVC1T45DCKR 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 VCC isolation for robust power sequencing. It is used in low-voltage interconnects between SoCs and peripherals in portable electronics.
For engineers reviewing the 74AVC1T45DCKR datasheet, 74AVC1T45DCKR pinout, 74AVC1T45DCKR application, or 74AVC1T45DCKR equivalent, this page delivers verified electrical specs, NanoFree™ SOT-SC70-6 package details, directional control behavior, Ioff partial-power-down support, and real-world level-shifting use cases - all confirmed against TI SCES530L (Jan 2026).
Technical Context
The 74AVC1T45DCKR implements a noninverting dual-rail architecture where DIR (referenced to VCCA) controls data flow direction: high enables A→B transmission, low enables B→A. Both A and B I/Os remain active regardless of DIR state, requiring defined logic levels to avoid excess ICC/ICCZ.
VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND. Ioff circuitry disables outputs during partial power-down, preventing backflow current. The device supports up to 500Mbps (1.8V→3.3V), with propagation delays as low as 2.4ns (A→B, VCCA=1.2V/VCCB=3.3V) and enable times under 7ns.
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 biasing |
| Max Data Rate | 500Mbps (1.8V→3.3V) - supports high-speed interface bridging in USB, SDIO, and low-power MCU peripherals |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with higher-voltage legacy signals while powered from 1.2V–3.3V supplies |
| Output Drive | ±12mA at 3.3V - sufficient to drive 50Ω transmission lines or multiple CMOS loads without external buffers |
| Propagation Delay (A→B) | 2.4ns typical (VCCA=1.2V, VCCB=3.3V) - enables sub-5ns timing margins in 200+MHz clock domains |
| Ioff Current | ±0.1µA max - ensures negligible leakage during system sleep modes, critical for battery-powered devices |
| ESD Rating | ±2000V HBM - meets industrial-grade robustness requirements without additional protection circuitry |
Pinout & Package
NanoFree™ SOT-SC70-6 (DCK) package: 2.0mm × 2.1mm footprint, ultra-thin profile, die-as-package construction for minimal parasitic inductance and thermal resistance (RθJA = 211.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCCA | A-port supply rail | Powers A-side logic and DIR input; sets A-port VIH/VIL thresholds and output swing |
| 2 - GND | Common reference | Single ground connection shared by both ports; no separate analog/digital grounds required |
| 3 - A | Bidirectional I/O (A side) | Signal terminal referenced to VCCA; accepts 1.2–3.6V inputs, drives 1.2–3.6V outputs |
| 4 - B | Bidirectional I/O (B side) | Signal terminal referenced to VCCB; accepts 1.2–3.6V inputs, drives 1.2–3.6V outputs |
| 5 - DIR | Direction control input | Referenced to VCCA; high = A→B, low = B→A; no internal pullup/pulldown - must be actively driven |
| 6 - VCCB | B-port supply rail | Powers B-side logic; sets B-port VIH/VIL thresholds and output swing independently of VCCA |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | Independent VCCA and VCCB (1.2–3.6V) allow arbitrary voltage node pairing - e.g., 1.2V MCU ↔ 3.3V sensor, no external resistors or regulators needed |
| VCC isolation | Automatic high-Z on both ports if either VCCA or VCCB = GND - prevents backfeeding and ensures safe hot-plug or power-rail sequencing |
| Ioff partial-power-down support | Outputs disabled with <±0.1µA leakage when VCCA or VCCB = 0V - eliminates contention and preserves battery life in standby states |
| NanoFree™ packaging | DCK package uses bare die as package - reduces board area by >40% vs. standard SOT-23, lowers inductance for cleaner signal integrity |
| 4.6V I/O tolerance | Withstands 4.6V on A/B pins even when VCCA/VCCB = 1.2V - enables direct connection to 5V-tolerant interfaces without level-shifter cascading |
Applications
| Mobile Sensor Interface | Low-Power MCU Peripherals |
|---|---|
|
Use Scenario: Interfacing a 1.2V IoT microcontroller with a 3.3V environmental sensor over I²C or SPI. IC Role / Device Role / Timing Role: Bidirectional voltage translator handling clock/data lines with sub-3ns propagation delay and automatic high-Z during MCU sleep. Use Value: Eliminates need for discrete resistor dividers or dedicated level-shifter ICs, reducing BOM count and PCB area while maintaining 400kHz I²C timing compliance. |
Use Scenario: Connecting a 1.8V FPGA I/O bank to a 2.5V memory controller in an edge AI inference module. IC Role / Device Role / Timing Role: Unidirectional translator (DIR fixed) enabling clean 500Mbps DDR signaling with matched A→B and B→A delay paths. Use Value: Achieves <2.5ns skew between complementary data lanes, meeting setup/hold timing for 250MHz source-synchronous interfaces. |
| Wearable Display Driver | Industrial Fieldbus Node |
|
Use Scenario: Level-shifting between a 1.5V display driver ASIC and a 3.3V touch controller in a smartwatch. IC Role / Device Role / Timing Role: Dual-supply transceiver supporting dynamic voltage scaling - VCCA tracks display rail, VCCB tracks touch rail. Use Value: Maintains signal integrity across voltage transitions during display brightness modulation, avoiding glitches during rail ramping. |
Use Scenario: Isolating 2.5V PLC logic from 3.3V Ethernet PHY in a DIN-rail mounted gateway. IC Role / Device Role / Timing Role: Direction-controlled translator enabling RS-485 half-duplex data exchange with VCC isolation during power fault events. Use Value: Prevents cross-rail current injection during brownout conditions, satisfying IEC 61000-4-2 ESD and IEC 61000-4-4 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1T45DBVR | Lower drive strength (±8mA @ 3.3V); narrower VCC range (1.65–5.5V); no VCC isolation | Not suitable for 1.2V systems or hot-swap scenarios requiring rail-independent disable | Prefer 74AVC1T45DCKR when translating below 1.65V or requiring guaranteed high-Z on rail loss |
| TXS0101DCKR | Auto-direction sensing (no DIR pin); lower max speed (60Mbps); higher ICCZ in 3-state | Eliminates direction control logic but limits data rate and increases standby current | Choose 74AVC1T45DCKR for deterministic, high-speed bidirectional control with minimal leakage |
Compared with SN74LVC1T45DBVR and TXS0101DCKR, the 74AVC1T45DCKR uniquely supports 1.2V operation, offers VCC isolation for fail-safe power sequencing, and delivers 500Mbps performance with <2.5ns propagation delay - making it optimal for next-generation ultra-low-voltage, high-speed embedded interconnects.
Availability
74AVC1T45DCKR is available at Aetrix Electronics and suitable for mobile sensor interfaces, low-power MCU peripherals, wearable display drivers, and industrial fieldbus nodes requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for 74AVC1T45DCKR 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 SN74AVC1T45 product line targets ultra-low-voltage, high-speed bidirectional level translation in space-constrained portable and IoT devices - emphasizing NanoFree™ packaging, rail-to-rail compatibility, and robust power sequencing behavior.
FAQ
What is the minimum operating voltage for 74AVC1T45DCKR on VCCA and VCCB?
The 74AVC1T45DCKR operates with VCCA and VCCB independently set from 1.2V to 3.6V. Both rails may be as low as 1.2V simultaneously, enabling full functionality in 1.2V system domains - confirmed per TI SCES530L Section 5.3 Recommended Operating Conditions.
Does 74AVC1T45DCKR require external pull-up or pull-down resistors on the A or B pins?
No. The 74AVC1T45DCKR includes weak internal pulldowns on all data I/Os (A and B) to prevent floating states, as specified in Section 5.3 of the datasheet. External resistors are unnecessary unless specific bus-hold or termination requirements exist.
How does the DIR pin function in 74AVC1T45DCKR, and what voltage domain references it?
The DIR pin is referenced solely to VCCA and determines data direction: logic high enables A→B transmission, logic low enables B→A. It has no internal pullup/pulldown and must be actively driven - a design requirement explicitly stated in Section 7.4 Function Table and Figure 4-1 pin diagram.
Can 74AVC1T45DCKR safely interface a 1.2V device with a 5V signal source?
No. While the 74AVC1T45DCKR I/Os tolerate up to 4.6V, they are not 5V-tolerant. Applying 5V to A or B pins exceeds the absolute maximum rating and risks permanent damage. For 5V interfaces, use a 5V-tolerant translator such as SN74AVCH series or add clamping protection.
What thermal performance can be expected from the DCK (SOT-SC70) package of 74AVC1T45DCKR?
The DCK package delivers RθJA = 211.4°C/W (per Section 5.4 Thermal Information), enabling reliable operation at up to 85°C ambient with typical power dissipation (<1mW static, <5mW dynamic). Its NanoFree™ construction minimizes junction-to-board resistance (RθJB = 65.7°C/W), supporting compact thermal design in dense layouts.
74AVC1T45DCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- Packaging:
- Bulk
- 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
- 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
74AVC1T45DCKR FAQ
1.How can I place an order for 74AVC1T45DCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AVC1T45DCKR 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 74AVC1T45DCKR reliable?
The price and inventory of 74AVC1T45DCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AVC1T45DCKR is usually 5 days.
3.What payment methods are accepted for 74AVC1T45DCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AVC1T45DCKR transactions.
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4.How is shipping managed for 74AVC1T45DCKR?
74AVC1T45DCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AVC1T45DCKR 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 74AVC1T45DCKR?
For technical support, including 74AVC1T45DCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AVC1T45DCKR requirements.
6.How does Aetrix verify that 74AVC1T45DCKR is sourced from the original manufacturer or authorized distributors?
All 74AVC1T45DCKR 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 74AVC1T45DCKR meets industry standards.
7.What is the process for return or replacement of 74AVC1T45DCKR?
All 74AVC1T45DCKR units undergo pre-shipment inspection (PSI). If there is an issue with 74AVC1T45DCKR, 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 74AVC1T45DCKR part is unused and in its original packaging.
Return procedure for 74AVC1T45DCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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