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Texas Instruments 74AVCH1T45DBVRG4
- Part No.:
- 74AVCH1T45DBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
74AVCH1T45DBVRG4.pdf
- Description:
- IC TRANSLATOR BIDIR SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
74AVCH1T45DBVRG4 from Texas Instruments is a single-bit dual-supply bus transceiver enabling bidirectional voltage translation between 1.2V–3.6V rails (e.g., 1.8V ↔ 3.3V), with 3-state outputs, bus-hold circuitry, and Ioff partial-power-down support. It operates in personal electronics, industrial controllers, and telecom interface bridges where level-shifting integrity and low-power idle states are critical.
For engineers reviewing the 74AVCH1T45DBVRG4 datasheet, 74AVCH1T45DBVRG4 pinout, 74AVCH1T45DBVRG4 application, or 74AVCH1T45DBVRG4 equivalent, key selection factors include VCCA/VCCB supply independence, DIR input referenced to VCCA, 4.6V I/O tolerance, sub-6ns propagation delay at 3.3V, and SOT-23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The 74AVCH1T45DBVRG4 implements a fully configurable dual-rail architecture: A-port I/Os track VCCA (1.2V–3.6V), B-port I/Os track VCCB (1.2V–3.6V), and DIR is referenced solely to VCCA. This enables asynchronous, direction-controlled data flow in either A→B or B→A mode without external biasing.
Its bus-hold circuitry actively maintains valid logic states on undriven A/B inputs (IBHL/IBHH ≥ ±25μA), eliminating external pull resistors. VCC isolation forces outputs into high-Z if either VCCA or VCCB is grounded, while Ioff limits leakage to ±5μA during power-off conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Range | 1.2V to 3.6V - powers A port and DIR input; defines VIH/VIL thresholds for direction control |
| VCCB Range | 1.2V to 3.6V - powers B port; independent of VCCA, enabling true bidirectional level translation |
| Max Data Rate | 500Mbps (1.8V→3.3V) - supports high-speed interconnects in portable SoC interfaces |
| Propagation Delay | 0.2ns (min, 3.3V→3.3V) - ensures timing-critical signal integrity in synchronous bus bridging |
| I/O Tolerance | 4.6V - allows safe interfacing with higher-voltage peripherals without clamping diodes |
| ESD Rating | HBM ±2000V - meets industrial handling requirements without additional protection circuitry |
| Bus-Hold Current | ±100μA (at 3.3V) - sustains stable logic levels on floating traces in low-pin-count embedded links |
Pinout & Package
SOT-23-6 (DBV) package: 2.90mm × 1.60mm body, 0.95mm max height, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | Power supply for A port and DIR input | Reference rail for A-side I/O voltage levels and DIR logic thresholds; must be stable before signal activity |
| GND | Ground reference | Common return path for both ports; requires low-inductance connection to minimize switching noise coupling |
| A | Bidirectional data I/O (A side) | Connects to 1.2V–3.6V domain; features bus-hold and 4.6V tolerance; driven only when DIR enables A→B or B→A path |
| VCCB | Power supply for B port | Independent rail for B-side operation; enables translation to/from different voltage domains without level-shifter ICs |
| DIR | Direction control input | Referenced to VCCA; high = A→B transmission, low = B→A transmission; no internal pullup/pulldown required |
| B | Bidirectional data I/O (B side) | Connects to 1.2V–3.6V domain; electrically isolated from A port except during active transfer; same bus-hold and tolerance specs as A |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Enables interoperability between mixed-voltage subsystems (e.g., 1.2V FPGA core ↔ 3.3V peripheral bus) without external resistive dividers or discrete MOSFET translators |
| Integrated bus-hold circuitry | Eliminates need for external 10kΩ pullup/pulldown resistors on A/B lines-reducing BOM count, board area, and signal rise/fall time degradation |
| VCC isolation | Automatically places A/B outputs in high-impedance state if either VCCA or VCCB drops to GND-preventing backdrive damage during hot-swap or power sequencing events |
| Ioff partial-power-down | Limits off-state leakage to ±5μA per port when one supply is inactive-critical for battery-backed systems maintaining communication readiness during sleep modes |
| NanoFree™ packaging | Die-as-package construction reduces thermal resistance (RθJA = 210.5°C/W) and parasitic inductance-improving signal fidelity and thermal performance in dense layouts |
Applications
| Mobile Device Power Management | Industrial Sensor Hub Interface |
|---|---|
Use Scenario: Interfacing a 1.8V microcontroller GPIO bank with a 3.3V PMIC register interface in a smartphone power tree. IC Role / Device Role: Bidirectional level translator ensuring reliable read/write access to PMIC configuration registers across voltage domains. Use Value: Eliminates risk of overvoltage damage to MCU pins while supporting 500Mbps burst transfers during dynamic voltage scaling sequences. | Use Scenario: Connecting a 1.2V MEMS sensor array to a 2.5V industrial PLC analog front-end controller via shared I²C bus. IC Role / Device Role: Voltage-translating bus buffer isolating sensor-side noise from controller-side signal integrity requirements. Use Value: Bus-hold maintains valid logic states during sensor sleep cycles, preventing spurious I²C start conditions caused by floating lines. |
| Telecom Baseband Processor Link | Enterprise SSD Controller Bridge |
Use Scenario: Level-shifting between a 1.5V baseband processor's UART TX/RX and a 3.3V RF transceiver's control interface. IC Role / Device Role: Asynchronous bidirectional transceiver managing command/response traffic with precise direction control via processor GPIO. Use Value: Sub-3ns propagation delay at 1.5V→3.3V ensures UART timing margins remain intact at 3Mbps baud rates. | Use Scenario: Bridging a 1.8V NVMe controller's sideband signals (CLKREQ#, PERST#) to a 3.3V PCIe switch management interface. IC Role / Device Role: 3-state-capable level shifter enabling hot-plug coordination and reset signaling across voltage-isolated domains. Use Value: VCC isolation guarantees PERST# remains asserted during controller power-up sequencing, preventing premature PCIe link training. |
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 data rate (400Mbps @ 1.8V→3.3V); no bus-hold; VCC isolation not specified | Requires external pull resistors; unsuitable for floating-bus scenarios or strict hot-swap isolation requirements | Select when cost sensitivity outweighs bus-hold necessity and VCC isolation is not required in the system architecture |
| TXS0101DCKR | Auto-direction sensing (no DIR pin); higher quiescent current (10μA vs 20μA combined); no Ioff support | Eliminates direction-control GPIO but increases standby power and lacks partial-power-down capability | Select for simple unidirectional or auto-sensed bidirectional links where DIR pin routing is constrained and Ioff is not needed |
Compared with SN74LVC1T45DBVR and TXS0101DCKR, the 74AVCH1T45DBVRG4 uniquely combines bus-hold, VCC isolation, and Ioff in a single SOT-23-6 package-making it the only option among the three that guarantees robust floating-line behavior, safe power sequencing, and ultra-low leakage during deep sleep modes.
Availability
74AVCH1T45DBVRG4 is available at Aetrix Electronics and suitable for mobile device power management, industrial sensor hub interfaces, and telecom baseband processor links requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.
Supply support for 74AVCH1T45DBVRG4 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 specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.
The AVC logic family-including the 74AVCH1T45DBVRG4-is engineered for ultra-low-voltage, mixed-domain digital interfacing in space- and power-constrained portable and IoT systems.
FAQ
What voltage ranges does the 74AVCH1T45DBVRG4 support on its A and B ports?
The 74AVCH1T45DBVRG4 supports 1.2V to 3.6V on both VCCA (A port) and VCCB (B port), enabling bidirectional translation between any combination within that range-e.g., 1.2V↔1.5V, 1.8V↔2.5V, or 1.8V↔3.3V. Each port's I/Os are referenced to their respective supply, and both tolerate up to 4.6V regardless of rail voltage.
How does the DIR input function in the 74AVCH1T45DBVRG4, and what voltage references it?
The DIR input in the 74AVCH1T45DBVRG4 controls data direction: high enables A→B transmission, low enables B→A transmission. Critically, DIR is referenced to VCCA-not VCCB-so its logic thresholds (VIH/VIL) scale with the A-port supply voltage. This ensures reliable direction control even when VCCA and VCCB differ significantly.
Does the 74AVCH1T45DBVRG4 require external pullup or pulldown resistors on its A and B pins?
No, the 74AVCH1T45DBVRG4 integrates active bus-hold circuitry on both A and B I/Os, which maintains valid logic states on undriven or floating lines. TI explicitly advises against using external pull resistors with this feature. Bus-hold sustaining current ranges from ±25μA (1.2V) to ±100μA (3.3V), sufficient to prevent metastability in typical embedded interfaces.
What happens to the 74AVCH1T45DBVRG4 outputs if either VCCA or VCCB is powered down to GND?
When either VCCA or VCCB drops to GND, the 74AVCH1T45DBVRG4 activates VCC isolation: all A and B outputs enter high-impedance state immediately, preventing back-current flow and protecting downstream components. The bus-hold circuitry remains active on the powered-up side, preserving signal integrity on the live rail.
Can the 74AVCH1T45DBVRG4 operate with mismatched supply voltages, such as VCCA = 1.2V and VCCB = 3.3V?
Yes-the 74AVCH1T45DBVRG4 is explicitly designed for mismatched dual-rail operation. With VCCA = 1.2V and VCCB = 3.3V, it achieves 240Mbps data rate and maintains full 4.6V I/O tolerance on both sides. Propagation delay remains under 6ns (typical), and electrical characteristics-including VOH/VOL and bus-hold-remain valid per the datasheet's specified test conditions.
74AVCH1T45DBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVCH
- 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:
- 380Mbps
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
74AVCH1T45DBVRG4 FAQ
1.How can I place an order for 74AVCH1T45DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AVCH1T45DBVRG4 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 74AVCH1T45DBVRG4 reliable?
The price and inventory of 74AVCH1T45DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AVCH1T45DBVRG4 is usually 5 days.
3.What payment methods are accepted for 74AVCH1T45DBVRG4?
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4.How is shipping managed for 74AVCH1T45DBVRG4?
74AVCH1T45DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AVCH1T45DBVRG4 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 74AVCH1T45DBVRG4?
For technical support, including 74AVCH1T45DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AVCH1T45DBVRG4 requirements.
6.How does Aetrix verify that 74AVCH1T45DBVRG4 is sourced from the original manufacturer or authorized distributors?
All 74AVCH1T45DBVRG4 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 74AVCH1T45DBVRG4 meets industry standards.
7.What is the process for return or replacement of 74AVCH1T45DBVRG4?
All 74AVCH1T45DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AVCH1T45DBVRG4, 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 74AVCH1T45DBVRG4 part is unused and in its original packaging.
Return procedure for 74AVCH1T45DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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