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Texas Instruments 74AVC4T245QDYYRQ1
- Part No.:
- 74AVC4T245QDYYRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
74AVC4T245QDYYRQ1.pdf
- Description:
- AUTOMOTIVE FOUR-BIT DUAL-SUPPLY
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
74AVC4T245QDYYRQ1 from Texas Instruments is an automotive-grade 4-bit dual-supply bus transceiver enabling bidirectional voltage translation between 1.2V–3.6V domains. It features independent A- and B-port supplies (VCCA/VCCB), 4.6V I/O tolerance, Ioff partial-power-down support, and operates across –40°C to 125°C ambient. It is used in telematics data buses interfacing 1.8V microcontrollers with 3.3V sensor clusters.
For engineers reviewing the 74AVC4T245QDYYRQ1 datasheet, 74AVC4T245QDYYRQ1 pinout, 74AVC4T245QDYYRQ1 application, or 74AVC4T245QDYYRQ1 equivalent, key selection criteria include configurable dual-rail operation, AEC-Q100 Grade 1 qualification, 380Mbps max data rate (1.8V→3.3V), VCCA-referenced control inputs, and SOT-16 (DYY) package thermal performance.
Technical Context
The device implements two independent 2-bit bidirectional translation channels, each controlled by dedicated DIR and OE pins referenced to VCCA. Directional data flow (A↔B) is determined by DIR logic level while OE enables/disables output drivers into high-impedance state.
Its dual-rail architecture isolates A- and B-side logic domains, supporting asynchronous communication across mismatched voltage nodes. VCC isolation ensures both ports enter high-Z if either VCCA or VCCB is at GND, and Ioff circuitry prevents backflow current during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V - Enables translation between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V system rails without external level-shifting components. |
| Max Data Rate | 380Mbps (1.8V→3.3V) - Supports high-speed infotainment interconnects such as MCU-to-display or MCU-to-ADAS sensor hub links. |
| I/O Tolerance | 4.6V - Allows safe interface with legacy 3.3V or 5V-tolerant peripherals even when VCCA/VCCB are at minimum 1.2V. |
| ESD Rating | HBM ±8kV, CDM ±1kV - Meets AEC-Q100 stress requirements for automotive PCB handling and in-system robustness. |
| Operating Temp | –40°C to +125°C - Qualified for engine bay, dashboard, and ADAS ECU environments per AEC-Q100 Grade 1. |
| Propagation Delay | 2.6ns (VCCA=2.5V, VCCB=3.3V) - Ensures timing-critical CAN/FlexRay auxiliary bus bridging meets setup/hold margins. |
| Ioff Current | ±5μA (–40°C to 125°C) - Guarantees safe partial-power-down during sleep mode without damaging current leakage. |
Pinout & Package
SOT-16 (DYY) package: 4.2mm × 2.0mm body, exposed thermal pad (must be connected to GND or left floating), 16-pin surface-mount with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply | Power rail for A-side I/Os and control inputs (1DIR, 2DIR, 1OE, 2OE); sets VIH/VIL thresholds. |
| VCCB | B-port supply | Independent power rail for B-side I/Os only; decouples B-port logic from A-port supply noise. |
| 1A1, 1A2, 2A1, 2A2 | A-port I/O | 4-bit A-side data lines referenced to VCCA; accept 1.2V–3.6V logic levels. |
| 1B1, 1B2, 2B1, 2B2 | B-port I/O | 4-bit B-side data lines referenced to VCCB; tolerate up to 4.6V regardless of VCCB setting. |
| 1DIR, 2DIR | Direction control | Active-HIGH signals (VCCA-referenced) selecting A→B (DIR=H) or B→A (DIR=L) data flow per channel. |
| 1OE, 2OE | Output enable | Active-LOW signals (VCCA-referenced) placing respective port outputs in high-impedance state when HIGH. |
| GND (pins 8,9) | Ground reference | Dual ground connections improve noise immunity and reduce ground bounce in high-speed switching. |
| Thermal Pad | Thermal path | Exposed copper pad beneath package; must be soldered to PCB GND plane for RθJB = 93.1°C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-rail translation | Independent VCCA/VCCB supplies allow simultaneous operation at different voltages (e.g., 1.8V MCU ↔ 3.3V camera interface). |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40°C to 125°C ambient, including HBM ±8kV and CDM ±1kV ESD robustness. |
| Ioff partial-power-down | Disables I/O circuits when VCCA or VCCB is unpowered, preventing backflow current and protecting upstream drivers. |
| VCC isolation | Automatically places both A and B ports in high-Z if either VCCA or VCCB drops to GND - critical for safe hot-plug and power sequencing. |
| 4.6V I/O tolerance | Enables direct connection to 3.3V or 5V systems without clamping diodes or resistive dividers, reducing BOM count. |
Applications
| Telematics Control Unit | Instrument Cluster Interface |
|---|---|
Use Scenario: Bridging a 1.8V application processor to a 3.3V cellular modem and GNSS receiver in a vehicle telematics module. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing asynchronous data flow between mismatched voltage domains on shared UART/SPI buses. Use Value: Eliminates need for discrete level shifters while maintaining 380Mbps throughput and AEC-Q100 reliability for over-the-air update paths. | Use Scenario: Interfacing a 2.5V graphics controller with 1.2V display memory and 3.3V backlight driver in a digital instrument cluster. IC Role / Device Role / Timing Role: Dual-rail bus transceiver enabling concurrent read/write operations across three distinct voltage rails with sub-3ns propagation delay. Use Value: Reduces signal integrity risk via matched trace lengths and eliminates timing skew introduced by multi-chip translation solutions. |
| Head Unit Audio Subsystem | Navigation System Sensor Hub |
Use Scenario: Connecting a 1.5V DSP core to 3.3V audio codecs and amplifier ICs in an automotive head unit. IC Role / Device Role / Timing Role: Configurable 4-bit transceiver supporting I²S and PCM data lanes with direction-controlled sample synchronization. Use Value: Maintains low-jitter audio clock distribution by avoiding additional buffering stages and preserving edge rates up to 200Mbps. | Use Scenario: Aggregating data from 1.8V inertial sensors, 2.5V GPS modules, and 3.3V radar pre-processors into a central navigation ECU. IC Role / Device Role / Timing Role: Voltage-level translator enabling shared SPI/UART bus access while isolating fault currents between subsystems. Use Value: Provides Ioff protection during sensor sleep cycles and VCC isolation during radar power cycling, improving system-level functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4T245QPWRQ1 | Lower max data rate (240Mbps), LVC family - no 4.6V I/O tolerance, VCC range limited to 1.65V–3.6V. | Not suitable for 1.2V/1.5V domain translation; requires ≥1.65V on both rails. | Select when cost sensitivity outweighs ultra-low-voltage support and 4.6V tolerance is unnecessary. |
| TXS4T245RTER | Auto-direction sensing (no DIR pin), lower drive strength (±8mA vs ±12mA), supports 1.2V–3.6V but lacks AEC-Q100 qualification. | Unsuitable for safety-critical automotive functions requiring ASIL-B/C compliance. | Prefer for non-automotive portable electronics where automatic direction detection simplifies firmware logic. |
Compared with SN74LVC4T245QPWRQ1 and TXS4T245RTER, the 74AVC4T245QDYYRQ1 uniquely delivers AEC-Q100 Grade 1 qualification, 4.6V I/O tolerance, and full 1.2V–3.6V dual-rail flexibility - making it the only option qualified for direct integration into ASIL-B automotive control units.
Availability
74AVC4T245QDYYRQ1 is available at Aetrix Electronics and suitable for telematics control units, instrument clusters, and head units requiring stable component supply across extended temperature and automotive lifecycle demands.
Supply support for 74AVC4T245QDYYRQ1 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 automotive, industrial, and personal electronics markets.
The AVC logic family targets high-speed, low-voltage, automotive-qualified level translation - specifically engineered for reliable bidirectional data exchange between mixed-voltage subsystems in modern vehicles.
FAQ
What is the maximum allowable voltage on the 74AVC4T245QDYYRQ1 I/O pins when VCCA or VCCB is unpowered?
The 74AVC4T245QDYYRQ1 I/O pins are rated for 4.6V regardless of supply state. When VCCA or VCCB is at 0V, the Ioff feature limits leakage to ±5μA (–40°C to 125°C), allowing safe biasing of B-port pins up to 4.6V without backfeed current - essential for hot-swap interfaces in automotive gateways.
How does the 74AVC4T245QDYYRQ1 handle power sequencing between VCCA and VCCB?
The 74AVC4T245QDYYRQ1 incorporates VCC isolation: if either VCCA or VCCB falls to GND, both A- and B-port outputs automatically enter high-impedance state. This prevents contention and latch-up during asymmetric power-up/down sequences common in automotive ECU designs using staggered DC-DC rails.
Can the 74AVC4T245QDYYRQ1 translate between 1.2V and 2.5V while maintaining AEC-Q100 compliance?
Yes - the 74AVC4T245QDYYRQ1 is fully specified for 1.2V–3.6V operation on both VCCA and VCCB. Its AEC-Q100 Grade 1 qualification covers all combinations within that range, including 1.2V↔2.5V translation at –40°C to 125°C ambient, with verified 150Mbps data rate and <6ns propagation delay.
What is the recommended pull-up resistor value for OE pins during power-up to ensure high-impedance state?
Tie OE to VCCA through a pull-up resistor; minimum value depends on driver sink capability. For typical 12mA sink strength, a 10kΩ resistor ensures OE remains >2.0V (VIH min at VCCA=3.3V) while limiting current to <0.3mA - sufficient to guarantee high-Z startup before firmware initializes DIR/OE control.
Does the 74AVC4T245QDYYRQ1 support fail-safe operation during single-rail power loss?
Yes - the VCC isolation feature forces both A and B ports into high-impedance state if either VCCA or VCCB drops to GND. This prevents bus contention and protects downstream devices during transient rail faults, satisfying ISO 26262 ASIL-B functional safety requirements for automotive communication bridges.
74AVC4T245QDYYRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 2
- Channels per Circuit:
- 2
- Voltage - VCCA:
- 1.2 V ~ 3.6 V
- Voltage - VCCB:
- 1.2 V ~ 3.6 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Push-Pull, Tri-State
- Data Rate:
- 380Mbps
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-16 Thin, SOT-23 Variant
74AVC4T245QDYYRQ1 FAQ
1.How can I place an order for 74AVC4T245QDYYRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AVC4T245QDYYRQ1 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 74AVC4T245QDYYRQ1 reliable?
The price and inventory of 74AVC4T245QDYYRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AVC4T245QDYYRQ1 is usually 5 days.
3.What payment methods are accepted for 74AVC4T245QDYYRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AVC4T245QDYYRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AVC4T245QDYYRQ1?
74AVC4T245QDYYRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AVC4T245QDYYRQ1 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 74AVC4T245QDYYRQ1?
For technical support, including 74AVC4T245QDYYRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AVC4T245QDYYRQ1 requirements.
6.How does Aetrix verify that 74AVC4T245QDYYRQ1 is sourced from the original manufacturer or authorized distributors?
All 74AVC4T245QDYYRQ1 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 74AVC4T245QDYYRQ1 meets industry standards.
7.What is the process for return or replacement of 74AVC4T245QDYYRQ1?
All 74AVC4T245QDYYRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with 74AVC4T245QDYYRQ1, 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 74AVC4T245QDYYRQ1 part is unused and in its original packaging.
Return procedure for 74AVC4T245QDYYRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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