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Texas Instruments SN74AXCH1T45DBVR
- Part No.:
- SN74AXCH1T45DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AXCH1T45DBVR.pdf
- Description:
- IC TRANSLATOR BIDIR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,965
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Product details
Overview
SN74AXCH1T45 from Texas Instruments is a single-bit dual-supply bus transceiver enabling bidirectional voltage translation between 0.65 V and 3.6 V rails, featuring tri-state outputs, bus-hold inputs, and VCC isolation. It supports up to 500-Mbps data rates (1.8 V → 3.3 V), operates from –40°C to +125°C, and draws ≤16 µA combined supply current at 125°C. It is used in low-power, mixed-voltage I/O bridging for portable electronics and industrial controllers.
For engineers reviewing the SN74AXCH1T45 datasheet, SN74AXCH1T45 pinout, SN74AXCH1T45 application, or SN74AXCH1T45 equivalent, this page delivers verified electrical parameters, directional control behavior, thermal metrics for SOT-23 packaging, bus-hold current thresholds, and real-world translation timing across 16 VCCA/VCCB combinations - all critical for voltage-domain interface design and PCB layout validation.
Technical Context
The SN74AXCH1T45 implements a fully configurable dual-rail architecture where Port A tracks VCCA (0.65–3.6 V) and Port B tracks VCCB (0.65–3.6 V), with DIR referenced to VCCA to determine signal direction (A→B or B→A). Its glitch-free power sequencing allows independent ramp-up/down of either supply without functional disruption.
Integrated bus-hold circuitry actively sustains unused inputs at valid logic levels-eliminating external resistors-with IBHL/IBHH currents ranging from ±4 µA (0.65 V) to ±145 µA (3.0 V). The VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB drops below 100 mV, and Ioff limits leakage to ±12 µA during partial power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA / VCCB) | 0.65 V to 3.6 V each - enables direct interfacing between sub-1-V logic (e.g., ARM Cortex-M0+ I/O) and 3.3-V peripherals without level-shifter ICs |
| Propagation Delay (A→B) | As low as 4 ns (VCCA = 3.3 V, VCCB = 3.3 V, TA = 85°C) - supports high-speed serial control links like PMBus or I²C clock stretching |
| Bus-Hold Current (IBHL / IBHH) | ±4 µA min at 0.65 V; ±145 µA max at 3.0 V - ensures robust noise immunity on floating data lines in battery-powered systems |
| Quiescent Current (ICCA + ICCB) | 10 µA max at 85°C, 16 µA max at 125°C - enables always-on I/O monitoring in energy-constrained IoT edge nodes |
| VCC Isolation Threshold | 100 mV - guarantees fail-safe high-Z state during brownout or hot-plug events, preventing backdrive damage |
| ESD Rating (HBM) | ±8000 V - meets industrial IEC 61000-4-2 system-level ESD requirements without external protection |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive modules and factory-floor PLC I/O expansion |
Pinout & Package
SOT-23 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, JEDEC MO-178AC compliant. Thermal resistance RθJA = 214.0°C/W; RθJB = 93.6°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCCA | A-port supply rail | Defines logic thresholds and drive strength for Port A; must be stable before enabling DIR or data traffic |
| 2 - GND | Common reference | Shared ground return for both supply domains; requires low-inductance connection to minimize switching noise coupling |
| 3 - A | Bidirectional I/O (A side) | Signal path referenced to VCCA; bus-hold active regardless of DIR state when VCCA is powered |
| 4 - VCCB | B-port supply rail | Independent of VCCA; powers B-side output drivers and input receivers; enables true dual-voltage operation |
| 5 - DIR | Direction control input | Logic level referenced to VCCA; HIGH = A→B, LOW = B→A; no internal pullup/pulldown - must be driven |
| 6 - B | Bidirectional I/O (B side) | Signal path referenced to VCCB; bus-hold active only when VCCB is present, independent of DIR |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-rail operation | Each port independently supports 0.65–3.6 V supplies - eliminates need for discrete level shifters in heterogeneous SoC-to-peripheral interfaces |
| Integrated bus-hold | Active on A and B inputs when respective VCC is present - removes external 10-kΩ pull resistors, reducing BOM count and board space |
| VCC isolation | Both ports auto-enter high-Z if either VCCA or VCCB falls below 100 mV - prevents latch-up and backfeed during power sequencing faults |
| Ioff partial-power-down | Limits I/O leakage to ±12 µA when VCC = 0 V - enables safe insertion/removal in live backplanes and hot-swap PCIe carriers |
| Glitch-free supply sequencing | No power-on reset or initialization required - VCCA and VCCB may be powered in any order without metastability or output glitches |
Applications
| Industrial Sensor Hub | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing ultra-low-power MEMS sensors (0.8-V I/O) with a 3.3-V microcontroller ADC interface. IC Role / Device Role / Timing Role: Voltage-translating bidirectional data channel with bus-hold maintaining sensor readout integrity during MCU sleep states. Use Value: Eliminates external level shifters and pull resistors, reducing node power by 12 µW and PCB area by 2.5 mm². |
Use Scenario: Bridging LIN transceiver (5-V tolerant) and 1.8-V CAN FD controller I/O in door module ECUs. IC Role / Device Role / Timing Role: Direction-controlled signal translator enabling shared diagnostic bus access while isolating supply domains. Use Value: VCC isolation prevents backdrive during LIN line fault conditions; 125°C rating ensures reliability in sealed cabin environments. |
| Enterprise SSD Power Sequencing | Smart Building HVAC Controller |
Use Scenario: Enabling NVMe host controller (1.2-V I/O) to communicate with legacy SATA SSDs (3.3-V signaling) during firmware update handshaking. IC Role / Device Role / Timing Role: Tri-state-enabled bidirectional translator synchronized to PCIe reset assertion to avoid bus contention. Use Value: Glitch-free sequencing allows independent VCCA/VCCB ramping - avoids timing violations during cold-boot power-up sequences. |
Use Scenario: Connecting 0.9-V wireless SoC GPIOs to 2.5-V BACnet MSTP transceivers in distributed HVAC node controllers. IC Role / Device Role / Timing Role: Low-quiescent-current voltage translator supporting always-on occupancy sensing with <16 µA total standby draw. Use Value: Bus-hold sustains valid logic on unconnected sensor lines during firmware OTA updates, preventing spurious HVAC actuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LXC1T45DBVR | Lower ICCA+ICCB (5 µA typ at 125°C); identical pinout and bus-hold; supports same 0.65–3.6 V range but optimized for sub-µA IoT endpoints. | Preferred for battery-operated devices requiring <10 µA total quiescent draw; lacks VCC isolation feature. | Select SN74LXC1T45DBVR when ultra-low static power dominates over fault tolerance during supply brownout. |
| TXS0101DCKR | Auto-direction sensing (no DIR pin); 1.65–3.6 V only on both sides; higher propagation delay (min 12 ns); no bus-hold. | Suitable for simple push-pull I²C/SMBus translation where direction is implicit; requires external pullups. | Choose TXS0101DCKR only for cost-sensitive, non-bus-hold applications with fixed 1.8/3.3-V domain pairs and no need for explicit DIR control. |
Compared with SN74LXC1T45DBVR and TXS0101DCKR, the SN74AXCH1T45 uniquely combines VCC isolation, full 0.65–3.6 V flexibility per rail, and guaranteed bus-hold - making it the only option for robust, mixed-voltage, fault-tolerant I/O bridging in automotive and industrial control systems.
Availability
SN74AXCH1T45 is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive body control modules, enterprise SSD power sequencing, and smart building HVAC controllers requiring stable component supply across extended temperature and voltage ranges.
Supply support for SN74AXCH1T45 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 and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and interface technologies.
The SN74AXCH1T45 belongs to TI's AXCH family of advanced configurable voltage translators, designed specifically for robust, low-power, mixed-voltage I/O bridging in automotive, industrial, and computing applications demanding wide supply range and fault resilience.
FAQ
What is the minimum operating voltage for SN74AXCH1T45 on each supply rail?
The SN74AXCH1T45 supports VCCA and VCCB down to 0.65 V independently. This enables direct interfacing with emerging sub-1-V logic families such as ARM Cortex-M23 cores and ultra-low-power sensor ASICs. Operation below 0.65 V is not characterized and may result in undefined bus-hold behavior or increased propagation delay variation.
Does SN74AXCH1T45 require external pullup or pulldown resistors on its I/O pins?
No. The SN74AXCH1T45 integrates active bus-hold circuitry on both A and B ports, which maintains unused or undriven inputs at valid logic states without external resistors. Using external pull resistors with enabled bus-hold is explicitly discouraged in the datasheet and may cause excessive current draw or logic contention.
How does the DIR pin function in SN74AXCH1T45, and what supply references it?
The DIR pin controls signal direction: HIGH enables A→B translation, LOW enables B→A. Critically, DIR is referenced to VCCA - its logic thresholds scale with VCCA voltage (e.g., VIH ≈ VCCA × 0.7). This ensures reliable direction control even when VCCA is as low as 0.65 V or as high as 3.6 V, independent of VCCB.
What happens to SN74AXCH1T45 outputs when one supply rail collapses?
When either VCCA or VCCB drops below 100 mV, the SN74AXCH1T45 activates VCC isolation: both A and B ports immediately enter high-impedance state, disabling all outputs. This prevents backdrive current flow and protects downstream components during brownout, hot-swap, or partial power-down events.
Can SN74AXCH1T45 operate with only one supply rail powered?
Yes - the SN74AXCH1T45 supports single-supply operation. If only VCCA is powered, Port A functions normally (with bus-hold active), while Port B remains high-Z. If only VCCB is powered, Port B functions with bus-hold, and Port A is high-Z. Ioff limits leakage to ±12 µA in either case, satisfying partial-power-down requirements.
SN74AXCH1T45DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AXCH
- 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:
- 0.65 V ~ 3.6 V
- Voltage - VCCB:
- 0.65 V ~ 3.6 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- 500Mbps
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
SN74AXCH1T45DBVR FAQ
1.How can I place an order for SN74AXCH1T45DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AXCH1T45DBVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74AXCH1T45DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AXCH1T45DBVR is usually 5 days.
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Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
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For technical support, including SN74AXCH1T45DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AXCH1T45DBVR requirements.
6.How does Aetrix verify that SN74AXCH1T45DBVR is sourced from the original manufacturer or authorized distributors?
All SN74AXCH1T45DBVR 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 SN74AXCH1T45DBVR meets industry standards.
7.What is the process for return or replacement of SN74AXCH1T45DBVR?
All SN74AXCH1T45DBVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AXCH1T45DBVR, 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 SN74AXCH1T45DBVR part is unused and in its original packaging.
Return procedure for SN74AXCH1T45DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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