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Texas Instruments SN74AXC1T45DEAR
- Part No.:
- SN74AXC1T45DEAR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AXC1T45DEAR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 6X2SON
- Quantity:
- Payment:
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Product details
Overview
SN74AXC1T45 from Texas Instruments is a single-bit dual-supply noninverting bus transceiver enabling bidirectional voltage translation between 0.65 V and 3.6 V domains. It features independent A-port (VCCA-referenced) and B-port (VCCB-referenced) rails, DIR-controlled signal direction, VCC isolation, Ioff partial-power-down support, and operates across –40°C to +125°C for industrial interface bridging.
For engineers reviewing the SN74AXC1T45 datasheet, SN74AXC1T45 pinout, SN74AXC1T45 application, or SN74AXC1T45 equivalent, key selection criteria include its 0.65–3.6 V per-rail translation range, <10 µA combined quiescent current at 85°C, 500 Mbps capability (1.8 V → 3.3 V), glitch-suppressed power sequencing, and high-impedance output behavior during VCC fault conditions.
Technical Context
The SN74AXC1T45 implements a dual-rail CMOS transceiver architecture with DIR input referenced to VCCA, enabling deterministic A→B or B→A data flow. Its internal level-shifting circuitry supports asymmetric supply configurations - e.g., VCCA = 0.8 V and VCCB = 3.3 V - without external components or direction latching.
Glitch suppression logic decouples power-up timing between VCCA and VCCB, eliminating spurious outputs during rail ramping. The VCC isolation feature disables both ports into high-impedance when either supply drops below 100 mV, while Ioff protection limits leakage to ±7.5 µA when powered down with biased I/Os.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Translation Range | 0.65 V to 3.6 V per rail - enables interface between sub-1V logic (e.g., modern SoCs) and legacy 3.3V peripherals without level-shifters. |
| Max Propagation Delay | 173 ns (A↔B, –40°C to 85°C, low VCC) - ensures timing predictability in mixed-voltage control paths with defined setup/hold margins. |
| Quiescent Current (ICCA + ICCB) | 10 µA max at 85°C - minimizes standby power in battery-backed or always-on industrial sensors and gateways. |
| ESD Protection | ±8000 V HBM, ±1000 V CDM - meets IEC 61000-4-2 system-level robustness requirements for field-deployed equipment. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive ECUs, motor drives, and industrial PLC I/O modules. |
| Ioff Leakage | ±7.5 µA max at 125°C - prevents back-driving and signal corruption in hot-swap or partial-power-down subsystems. |
| Supply Isolation Threshold | 100 mV - guarantees automatic high-Z state on both ports if either VCCA or VCCB collapses, preventing bus contention. |
Pinout & Package
SN74AXC1T45 is available in five 6-pin packages: DBV (SOT-23), DCK (SC70), DRL (SOT-5X3), DEA (X2SON), and DTQ (X2SON). All variants share identical pin numbering and function mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | Power supply for A port | Reference rail for A-port I/O and DIR input thresholds; supports 0.65–3.6 V; powers internal A-side logic. |
| GND | Ground reference | Common return path for both supply domains; must be low-impedance to minimize ground bounce during translation. |
| A | Bidirectional data I/O (A side) | Signal terminal referenced to VCCA; functions as input or output depending on DIR state; must not float. |
| VCCB | Power supply for B port | Reference rail for B-port I/O; independent of VCCA; supports 0.65–3.6 V; powers internal B-side logic. |
| DIR | Direction control input | Logic input referenced to VCCA; HIGH = A→B translation, LOW = B→A; no pull-up/down required. |
| B | Bidirectional data I/O (B side) | Signal terminal referenced to VCCB; complements A port; shares same bidirectional behavior under DIR control. |
Key Features
| Feature | Design Value |
|---|---|
| Dual configurable supply rails | Independent VCCA and VCCB inputs enable heterogeneous voltage domain bridging - e.g., 0.8 V FPGA core ↔ 3.3 V sensor interface - without external biasing. |
| VCC isolation | Automatic high-impedance output disable when either VCCA or VCCB falls below 100 mV - prevents bus contention during brown-out or hot-plug events. |
| Glitch suppression | Eliminates transient output glitches during asynchronous power-up/down of VCCA and VCCB - removes need for external power sequencing controllers. |
| Ioff partial-power-down | Limits I/O leakage to ±7.5 µA at 125°C when device is unpowered but ports are biased - essential for backplane and modular system designs. |
| Wide temperature operation | Specified from –40°C to +125°C with full electrical performance - supports deployment in engine control units, industrial inverters, and outdoor telecom gear. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing ultra-low-voltage MEMS sensors (0.7 V output) to 3.3 V microcontroller ADC inputs in factory automation nodes. IC Role / Device Role / Timing Role: Bidirectional voltage translator isolating sensor domain from MCU domain while preserving signal integrity and timing alignment. Use Value: Eliminates discrete resistor-divider or active level-shifter circuits, reducing BOM count and PCB area by >40% in space-constrained sensor nodes. |
Use Scenario: Connecting 1.2 V CAN FD controller outputs to 3.3 V diagnostic port logic in body control units with mixed-voltage subsystems. IC Role / Device Role / Timing Role: Direction-controlled level shifter ensuring clean signal edge transitions across voltage domains without skew or metastability. Use Value: Enables reliable communication handshaking between next-gen low-power controllers and legacy diagnostics infrastructure under wide ambient temperature swings. |
| Programmable Logic I/O Expansion | Enterprise SSD Power Management |
Use Scenario: Extending FPGA I/O banks to drive 1.8 V DDR termination resistors and 2.5 V PMIC enable lines in reconfigurable compute accelerators. IC Role / Device Role / Timing Role: Single-bit configurable transceiver managing isolated control signals with precise direction control and rail-fault safety. Use Value: Provides deterministic signal routing with <10 ns enable/disable timing margin, critical for synchronous configuration sequences in FPGA-based systems. |
Use Scenario: Translating 0.9 V NVMe controller GPIOs to 1.2 V power-good signals for SSD DRAM and flash power rails in enterprise storage arrays. IC Role / Device Role / Timing Role: Fault-tolerant voltage translator with VCC isolation ensuring safe power sequencing during thermal throttling or emergency shutdown. Use Value: Prevents latch-up or data corruption during dynamic power-state transitions by forcing high-Z on all I/Os when any rail collapses below 100 mV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC1T45 | Lower max VCC (3.6 V vs. SN74AXC1T45's 3.6 V), but only supports down-to-1.2 V translation; no sub-1V operation. | Not suitable for 0.65–0.8 V domains like advanced SoCs or LPDDR5 interfaces. | Select SN74AXC1T45 when interfacing sub-1V logic; choose SN74AVC1T45 only for 1.2–3.3 V legacy systems where cost is primary. |
| TXS0101 | Auto-direction sensing (no DIR pin); higher propagation delay (up to 200 ns); no VCC isolation or glitch suppression. | Unsuited for deterministic bidirectional control or safety-critical power sequencing. | Prefer SN74AXC1T45 for DIR-controlled, fault-resilient designs; use TXS0101 only in simple unidirectional or low-speed open-drain scenarios. |
Compared with SN74AVC1T45 and TXS0101, the SN74AXC1T45 uniquely supports true 0.65 V operation, integrates VCC isolation and glitch suppression for robust power sequencing, and delivers lower propagation delay in sub-1V configurations - making it the only choice for next-generation low-voltage system interconnects requiring reliability and precision.
Availability
SN74AXC1T45 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and enterprise SSD power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AXC1T45 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 solutions, with decades of expertise in interface IC design and automotive-grade qualification.
The SN74AXC1T45 belongs to TI's AXC family of ultra-low-voltage translators, engineered specifically for seamless interoperability between emerging sub-1V process nodes and established higher-voltage system components in industrial and automotive applications.
FAQ
What voltage ranges does the SN74AXC1T45 support on each port?
The SN74AXC1T45 supports 0.65 V to 3.6 V independently on both VCCA and VCCB rails. This allows translation between domains such as 0.7 V A-port and 3.3 V B-port, or 1.8 V ↔ 2.5 V, with full functionality across the entire range - verified per TI SCES882E datasheet Section 5.3.
How does the DIR pin function in the SN74AXC1T45?
The DIR pin in the SN74AXC1T45 is referenced to VCCA and controls translation direction: logic HIGH enables A→B flow, logic LOW enables B→A flow. Its threshold tracks VCCA (e.g., VIH = 0.65×VCCA), ensuring compatibility across all supported supply voltages - detailed in Section 4 and Table 4-1 of the SN74AXC1T45 datasheet.
Does the SN74AXC1T45 provide protection during power-supply faults?
Yes. The SN74AXC1T45 includes VCC isolation: if either VCCA or VCCB drops below 100 mV, both A and B ports enter high-impedance state. It also features Ioff protection limiting leakage to ±7.5 µA at 125°C when unpowered - critical for fault-tolerant industrial and automotive designs per Sections 7.3 and 5.5.
What is the maximum data rate supported by the SN74AXC1T45?
The SN74AXC1T45 supports up to 500 Mbps when translating from 1.8 V to 3.3 V, as specified in the Features section of the datasheet. Actual achievable rate depends on load capacitance and supply configuration - e.g., propagation delay drops to 4 ns (max) at VCCA = 3.3 V / VCCB = 3.3 V per Table 5-8.
Is the SN74AXC1T45 suitable for automotive applications?
Yes. The SN74AXC1T45 is qualified for operation from –40°C to +125°C, meets JESD 78 Class II latch-up immunity (>100 mA), and exceeds JESD 22 ESD ratings (±8000 V HBM). These specifications align with AEC-Q100 stress test requirements for automotive body electronics and infotainment interfaces.
Which package options are available for the SN74AXC1T45?
The SN74AXC1T45 is offered in five compact 6-pin packages: DBV (SOT-23, 2.9 mm × 2.8 mm), DCK (SC70, 2.0 mm × 2.1 mm), DRL (SOT-5X3, 1.6 mm × 1.6 mm), DEA (X2SON, 1.0 mm × 1.0 mm), and DTQ (X2SON, 1.0 mm × 0.8 mm) - all sharing identical pinout and electrical specs per Section 11 of the datasheet.
SN74AXC1T45DEAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AXC
- 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:
- 6-XFDFN
SN74AXC1T45DEAR FAQ
1.How can I place an order for SN74AXC1T45DEAR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AXC1T45DEAR 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 SN74AXC1T45DEAR reliable?
The price and inventory of SN74AXC1T45DEAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AXC1T45DEAR is usually 5 days.
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SN74AXC1T45DEAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AXC1T45DEAR 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 SN74AXC1T45DEAR?
For technical support, including SN74AXC1T45DEAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AXC1T45DEAR requirements.
6.How does Aetrix verify that SN74AXC1T45DEAR is sourced from the original manufacturer or authorized distributors?
All SN74AXC1T45DEAR 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 SN74AXC1T45DEAR meets industry standards.
7.What is the process for return or replacement of SN74AXC1T45DEAR?
All SN74AXC1T45DEAR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AXC1T45DEAR, 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 SN74AXC1T45DEAR part is unused and in its original packaging.
Return procedure for SN74AXC1T45DEAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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