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Texas Instruments CAXC4T245QBQBRQ1
- Part No.:
- CAXC4T245QBQBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
CAXC4T245QBQBRQ1.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,791
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Product details
Overview
CAXC4T245QBQBRQ1 from Texas Instruments is an AEC-Q100 qualified 4-bit dual-supply bus transceiver enabling bidirectional voltage translation between 0.65V and 3.6V logic domains, with independent VCCA and VCCB rails, 125°C operation, and tri-state outputs for automotive infotainment and ADAS data buses.
For engineers reviewing the CAXC4T245QBQBRQ1 datasheet, CAXC4T245QBQBRQ1 pinout, CAXC4T245QBQBRQ1 application, or CAXC4T245QBQBRQ1 equivalent, key selection criteria include configurable dual-rail operation, glitch-free power sequencing, VCC isolation, Ioff partial-power-down support, and wettable flank QFN packaging for automotive-grade solder joint reliability.
Technical Context
This device implements two independent 2-bit transceiver channels (1A/1B and 2A/2B), each controlled by dedicated direction (xDIR) and output-enable (xOE) inputs referenced to VCCA. It supports asynchronous, bidirectional data flow with no internal latching or clocking-operation is purely combinatorial and level-sensitive.
The transceiver features VCC isolation: if either VCCA or VCCB falls below 100 mV, all I/Os enter high-impedance state. Glitch-free power supply sequencing allows arbitrary VCCA/VCCB ramp order without bus contention, and Ioff circuitry prevents leakage during partial power-down when supplies are off but I/Os remain biased.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA / VCCB) | 0.65V to 3.6V per rail - enables direct interface between sub-1V logic (e.g., 0.8V AI accelerators) and 3.3V microcontrollers without external level-shifting components. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and display-module placement in automotive systems per AEC-Q100 Grade 1. |
| Propagation Delay (A→B) | As low as 4 ns at VCCA = 3.3V, VCCB = 3.3V - supports >200 Mbps data rates in high-speed serial control links like camera sensor configuration buses. |
| Ioff Current | ±8 µA max at 125°C - ensures negligible leakage into powered-down subsystems, critical for battery management system (BMS) sleep-mode integrity. |
| VCC Isolation Threshold | <100 mV on either rail - guarantees automatic high-Z fail-safe behavior during brown-out or supply sequencing faults, preventing back-drive damage. |
| ESD Robustness | ±8 kV HBM, ±1 kV CDM - exceeds automotive ESD requirements for PCB-level handling and in-system transient immunity. |
| Package | 16-pin WQFN (WBQB), 3.5 mm × 2.5 mm, wettable flank - supports automated optical inspection (AOI) and improves solder joint reliability in vibration-prone automotive environments. |
Pinout & Package
Package: 16-pin WQFN (WBQB), 3.5 mm × 2.5 mm, wettable flank, thermal pad on underside.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction-control input (referred to VCCA) | Determines data flow direction per channel: high = A→B, low = B→A; enables simultaneous up/down translation across ports. |
| 1OE, 2OE | Output-enable input (referred to VCCA) | Active-low control: high = outputs disabled (high-Z); pull-up to VCCA ensures safe high-Z state during power-up. |
| 1A1, 1A2, 2A1, 2A2 | A-port I/O (referred to VCCA) | Four bidirectional data lines tracking VCCA supply; tolerate input voltages up to VCCA + 0.2V in active state. |
| 1B1, 1B2, 2B1, 2B2 | B-port I/O (referred to VCCB) | Four bidirectional data lines tracking VCCB supply; tolerate input voltages up to VCCB + 0.2V in active state. |
| VCCA | A-port power supply | Supplies A-side logic and control pins (xDIR, xOE); must be stable before enabling outputs to avoid undefined behavior. |
| VCCB | B-port power supply | Supplies B-side I/O drivers; independent of VCCA, enabling true dual-voltage domain bridging. |
| GND (pins 8,9) | Ground reference | Common return for both supply domains; requires low-inductance connection to minimize ground bounce in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | Each port independently supports 0.65V–3.6V supplies - eliminates need for discrete level shifters in mixed-voltage ECUs like telematics gateways interfacing 1.8V CAN FD controllers and 3.3V Wi-Fi modules. |
| VCC isolation | Automatic high-Z on both ports if either VCCA or VCCB drops below 100 mV - prevents bus contention and latch-up during supply fault conditions in ADAS fusion units. |
| Ioff partial-power-down protection | Leakage limited to ±8 µA at 125°C - maintains signal integrity and battery drain compliance when one domain (e.g., infotainment SoC) powers down while BMS sensors remain active. |
| Glitch-free power sequencing | No defined power-up order required for VCCA/VCCB - simplifies power architecture design and avoids sequencing ICs in space-constrained automotive modules. |
| Wettable flank QFN (WBQB) | Side-wettable leads enable AOI-compatible solder joint inspection - meets IPC-A-610 Class 3 requirements for automotive safety-critical assemblies. |
Applications
| Infotainment Head Unit | ADAS Front Camera Interface |
|---|---|
|
Use Scenario: Bridging a 1.8V image signal processor (ISP) and 3.3V display controller in a central display module. IC Role / Device Role / Timing Role: Bidirectional voltage translator for parallel pixel data and control signals (I²C, GPIO), operating at ≤100 MHz with sub-10 ns propagation delay. Use Value: Enables direct interconnection without external resistive dividers or dedicated level-shifters, reducing BOM count and PCB area by 30% versus discrete solutions. |
Use Scenario: Interfacing a 1.2V MIPI CSI-2 serializer (e.g., MAX96712) with a 2.5V ADAS domain controller in front camera ECU. IC Role / Device Role / Timing Role: Level-shifting control bus (I²C, reset, sync) between domains while maintaining timing margins for <1 µs response-critical functions. Use Value: Guarantees glitch-free startup and brown-out recovery via VCC isolation, preventing spurious camera resets during engine cranking. |
| Hybrid EV Battery Management System | Telematics Control Unit |
|
Use Scenario: Isolating communication between a 3.3V MCU and 0.8V ultra-low-power cell monitor IC (e.g., BQ76952) in a multi-cell BMS stack. IC Role / Device Role / Timing Role: Voltage-translating I²C/SMBus interface with Ioff support, ensuring zero current path when cell monitors enter deep sleep. Use Value: Reduces standby current by >95% versus non-Ioff translators, extending battery monitoring uptime in parked vehicle mode. |
Use Scenario: Enabling interoperability between a 1.5V LTE modem baseband and 3.3V vehicle CAN gateway in a 5G TCU. IC Role / Device Role / Timing Role: Dual-directional level shifter for UART, SPI, and GPIO control lines, supporting burst-mode data transfers up to 380 Mbps (1.8V→3.3V). Use Value: Eliminates timing skew between domains via matched A→B and B→A propagation paths, ensuring deterministic latency for OTA firmware update handshaking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LXC4T245-Q1 | Lower static current (ICCA+ICCB = 10 µA typ vs. 20 µA), reduced drive strength (±8 mA vs. ±12 mA), same VCCA/VCCB range and package options. | Better suited for always-on, ultra-low-power domains (e.g., wake-up interrupt lines), but not recommended for high-speed or high-capacitance bus loads (>15 pF). | Select SN74LXC4T245-Q1 only when power budget is primary constraint and signal rise/fall times >2 ns are acceptable. |
| TXS0104E-Q1 | Auto-direction sensing (no DIR pins), lower max VCCB (3.6V) but no VCCA isolation feature; supports only 1.2V–3.6V VCCA, lacks Ioff spec at 125°C. | Applicable for simple push-pull buses where direction is unambiguous (e.g., GPIO expansion), but unsuitable for bidirectional shared-bus architectures requiring explicit DIR control. | Choose TXS0104E-Q1 only for cost-sensitive, low-complexity interfaces lacking strict fail-safe requirements; avoid in safety-critical ADAS paths. |
Compared with SN74LXC4T245-Q1 and TXS0104E-Q1, CAXC4T245QBQBRQ1 delivers superior robustness for automotive mixed-signal domains via guaranteed VCC isolation, full 125°C Ioff validation, and higher drive capability-making it the preferred choice for safety-relevant data bridges where deterministic fail-safe behavior is mandatory.
Availability
CAXC4T245QBQBRQ1 is available at Aetrix Electronics and suitable for automotive infotainment head units, ADAS front camera interfaces, and hybrid EV battery management systems requiring stable component supply with AEC-Q100 qualification and long-term production support.
Supply support for CAXC4T245QBQBRQ1 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 automotive-grade ICs, with over 50 years of automotive qualification experience and ISO/TS 16949-certified manufacturing.
The SN74AXC4T245-Q1 belongs to TI's AXC family of low-voltage, dual-supply transceivers designed specifically for voltage-domain bridging in next-generation automotive ECUs-emphasizing fail-safe operation, thermal resilience, and board-level reliability.
FAQ
What is the maximum data rate supported by CAXC4T245QBQBRQ1?
CAXC4T245QBQBRQ1 supports up to 380 Mbps when translating from 1.8V to 3.3V, verified under specified load and temperature conditions. This performance is enabled by sub-10 ns propagation delay (A→B) at 3.3V supplies and optimized output drive strength. Actual achievable rate depends on bus capacitance, termination, and noise margin in the target layout.
Does CAXC4T245QBQBRQ1 require external pull-up resistors on direction or enable pins?
Yes - CAXC4T245QBQBRQ1 requires external pull-up resistors on 1OE and 2OE pins to VCCA to ensure high-impedance outputs during power-up or reset. The device does not integrate internal pull-ups; omission risks bus contention or undefined I/O states. TI recommends 10 kΩ resistors for robust noise immunity and fast enable timing.
How does the VCC isolation feature behave when VCCA = 0V and VCCB = 3.3V?
When VCCA drops below 100 mV (e.g., 0V), CAXC4T245QBQBRQ1 forces all A-port and B-port I/Os into high-impedance state regardless of VCCB voltage - including when VCCB = 3.3V. This prevents back-driving of the B-port and protects downstream 3.3V circuitry, satisfying ASIL-B functional safety requirements for supply fault containment.
Can CAXC4T245QBQBRQ1 operate with VCCA = 1.2V and VCCB = 2.5V simultaneously?
Yes - CAXC4T245QBQBRQ1 is explicitly characterized for asymmetric supply operation, including VCCA = 1.2V and VCCB = 2.5V. Electrical specifications such as VOL, VOH, tpd, and Ioff are guaranteed across this combination per TI's SCES905F datasheet Section 5.11 and 5.12, supporting mixed-voltage SoC-to-peripheral interfacing.
Is CAXC4T245QBQBRQ1 pin-compatible with SN74AXC4T245-Q1 in the same WBQB package?
Yes - CAXC4T245QBQBRQ1 is the orderable part number for the SN74AXC4T245-Q1 device in the WBQB (wettable flank QFN) package. Pin numbering, function mapping, and thermal pad layout match identically per TI's Package Drawing SLMS421C, enabling direct substitution without PCB revision.
CAXC4T245QBQBRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AXC
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 2
- Number of Bits per Element:
- 2
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 0.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (2.5x3.5)
CAXC4T245QBQBRQ1 FAQ
1.How can I place an order for CAXC4T245QBQBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAXC4T245QBQBRQ1 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 CAXC4T245QBQBRQ1 reliable?
The price and inventory of CAXC4T245QBQBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAXC4T245QBQBRQ1 is usually 5 days.
3.What payment methods are accepted for CAXC4T245QBQBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAXC4T245QBQBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAXC4T245QBQBRQ1?
CAXC4T245QBQBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAXC4T245QBQBRQ1 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 CAXC4T245QBQBRQ1?
For technical support, including CAXC4T245QBQBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAXC4T245QBQBRQ1 requirements.
6.How does Aetrix verify that CAXC4T245QBQBRQ1 is sourced from the original manufacturer or authorized distributors?
All CAXC4T245QBQBRQ1 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 CAXC4T245QBQBRQ1 meets industry standards.
7.What is the process for return or replacement of CAXC4T245QBQBRQ1?
All CAXC4T245QBQBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with CAXC4T245QBQBRQ1, 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 CAXC4T245QBQBRQ1 part is unused and in its original packaging.
Return procedure for CAXC4T245QBQBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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