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Texas Instruments SN74AVC4T245PWRE4
- Part No.:
- SN74AVC4T245PWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AVC4T245PWRE4.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,055
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Product details
Overview
SN74AVC4T245 from Texas Instruments is a 4-bit dual-supply noninverting bus transceiver enabling bidirectional voltage translation between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. It features independent VCCA (1.2–3.6V) and VCCB (1.2–3.6V) rails, 4.6V I/O tolerance, Ioff partial-power-down support, and up to 380Mbps data rate (1.8V→3.3V). It serves in low-voltage interconnects between processors, FPGAs, and peripherals.
For engineers reviewing the SN74AVC4T245 datasheet, SN74AVC4T245 pinout, SN74AVC4T245 application, or SN74AVC4T245 equivalent, key selection criteria include dual-rail configurability, 3-state output control per channel, VCCA-referenced DIR/OE inputs, Ioff-enabled isolation during power sequencing, and verified 380Mbps performance at 1.8V-to-3.3V translation.
Technical Context
The SN74AVC4T245 implements two independent 2-bit bidirectional channels, each with dedicated DIR and OE controls referenced to VCCA. Its dual-rail architecture decouples A-port (VCCA-tracked) and B-port (VCCB-tracked) logic levels, enabling asynchronous translation without clocking or direction latching.
Functional mode is determined by OE (global 3-state enable) and DIR (per-channel direction select), with all input circuits always active. The device supports VCC isolation: if either VCCA or VCCB = GND, both ports enter high-impedance state-critical for hot-swap and partial-power-down systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range (VCCA/VCCB) | 1.2V to 3.6V - enables universal translation across 1.2V/1.5V/1.8V/2.5V/3.3V nodes without level-shifter redesign. |
| Max Data Rate | 380Mbps (1.8V→3.3V) - supports high-speed interfaces like memory expansion buses and FPGA I/O bridging. |
| I/O Tolerance | 4.6V - allows safe interfacing with higher-voltage legacy peripherals without external protection. |
| Ioff Current | ±1μA max (at 0V supply) - prevents backflow current during partial power-down, protecting powered subsystems. |
| ESD Rating (HBM) | 8kV - exceeds JEDEC JS-001 Class 3A, enabling robust handling in manufacturing and field deployment. |
| Propagation Delay | 2.6ns typical (VCCA=3.3V, VCCB=2.5V) - ensures timing-critical signal integrity in synchronous data paths. |
| Operating Temp | –40°C to +85°C - qualified for industrial and enterprise equipment environments. |
Pinout & Package
Packaged in 16-pin TSSOP (PW), the SN74AVC4T245 uses a compact 5mm × 6.4mm footprint with exposed thermal pad for enhanced thermal dissipation in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction-control input (per channel) | Referenced to VCCA; high = A→B data flow, low = B→A - enables independent bidirectional control of two 2-bit lanes. |
| 1OE, 2OE | Output-enable input (per channel) | Referenced to VCCA; high = 3-state outputs - allows selective channel disable without affecting other lanes or power rails. |
| 1A1–2A2 | A-port I/O (VCCA-referenced) | 4-bit A-side interface tracking VCCA; accepts 1.2–3.6V logic - connects to core logic (e.g., SoC I/O banks). |
| 1B1–2B2 | B-port I/O (VCCB-referenced) | 4-bit B-side interface tracking VCCB; accepts 1.2–3.6V logic - interfaces with peripherals operating at different voltage domains. |
| VCCA, VCCB | Independent power supplies | VCCA powers A-port I/Os and all control inputs; VCCB powers B-port I/Os - eliminates need for shared rail or external regulators. |
| GND | Ground reference | Two dedicated GND pins (pins 8 & 9) reduce ground bounce and improve noise immunity in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent VCCA/VCCB operation (1.2–3.6V each) enables seamless interoperability between mixed-voltage subsystems without external biasing. |
| Per-channel 3-state control | Separate 1OE/2OE inputs allow granular output disabling - critical for bus arbitration and multi-drop configurations. |
| VCC isolation | Automatic high-impedance on both ports when either VCCA or VCCB = GND - prevents latch-up during power sequencing failures. |
| Ioff partial-power-down | Sub-1μA off-state leakage blocks damaging backflow current when one rail is unpowered - simplifies power management in modular systems. |
| 4.6V-tolerant I/Os | Withstands overvoltage up to 4.6V regardless of VCCA/VCCB - eliminates need for external clamping diodes in mixed-voltage debug/test scenarios. |
Applications
| Processor-to-Peripheral Interfacing | FPGA I/O Bridging |
|---|---|
Use Scenario: Connecting a 1.8V ARM processor to a 3.3V UART or SPI peripheral in an industrial controller. IC Role / Device Role / Timing Role: Bidirectional level translator managing data flow direction and isolating voltage domains during reset sequences. Use Value: Eliminates discrete resistor-divider or MOSFET-based solutions, reducing BOM count and layout area while guaranteeing 380Mbps throughput. | Use Scenario: Enabling communication between a 1.2V FPGA I/O bank and a 2.5V DDR memory controller in a telecom baseband module. IC Role / Device Role / Timing Role: Synchronous voltage translator with sub-3ns propagation delay ensuring setup/hold compliance at 100MHz+ clock rates. Use Value: Maintains signal integrity across voltage boundaries without adding jitter or skew, supporting deterministic timing closure. |
| Hot-Swappable Module Interface | Multi-Voltage Sensor Hub |
Use Scenario: Isolating a 3.3V hot-plug I/O module from a 1.5V host system bus during insertion/removal. IC Role / Device Role / Timing Role: VCC-isolated transceiver that enters high-Z on loss of either supply - prevents bus contention and backfeeding. Use Value: Enables safe live insertion without system reboot or manual power cycling, meeting enterprise rack-mount reliability requirements. | Use Scenario: Aggregating sensor data from 1.8V accelerometers, 2.5V temperature sensors, and 3.3V ADCs into a 1.2V microcontroller in a wearable health monitor. IC Role / Device Role / Timing Role: Multi-node voltage translator with per-port OE control allowing dynamic sensor activation and power gating. Use Value: Reduces system-level power consumption by enabling selective channel shutdown, extending battery life by >15% in duty-cycled operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0104RUTR | Auto-direction sensing (no DIR pin); lower max speed (100Mbps); smaller 14-pin UQFN package. | Best for simple push-pull I²C/SPI where direction is predictable; unsuitable for bidirectional data buses requiring explicit DIR control. | Select SN74AVC4T245 when precise per-lane direction control, 380Mbps throughput, or TSSOP packaging is required. |
| SN74LVC4T245PWR | Single-supply only (VCC = 1.65–3.6V); no dual-rail translation; identical pinout but lacks VCCB and Ioff. | Applicable only when both sides share same voltage domain; cannot translate 1.2V↔3.3V or support partial power-down. | Choose SN74AVC4T245 for true mixed-voltage systems; use SN74LVC4T245PWR only for same-rail buffering with cost sensitivity. |
Compared with TXB0104RUTR and SN74LVC4T245PWR, the SN74AVC4T245 uniquely delivers configurable dual-rail operation, highest data rate (380Mbps), and Ioff-enabled power sequencing - making it the sole option for robust, high-speed, multi-voltage bus bridging in industrial and telecom infrastructure.
Availability
SN74AVC4T245 is available at Aetrix Electronics and suitable for industrial controllers, telecom baseband modules, enterprise server I/O expansion, and FPGA-based embedded systems requiring stable component supply across extended product lifecycles.
Supply support for SN74AVC4T245 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 industrial, automotive, and consumer markets.
The SN74AVC4T245 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional translation in space- and power-constrained digital systems.
FAQ
What voltage ranges does the SN74AVC4T245 support on its A and B ports?
The SN74AVC4T245 supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port). This allows translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. The control inputs (DIR, OE) are referenced to VCCA, and all I/Os tolerate up to 4.6V regardless of supply voltage - a key design feature of the SN74AVC4T245.
How does the SN74AVC4T245 handle power sequencing during system startup or shutdown?
The SN74AVC4T245 incorporates VCC isolation and Ioff circuitry to manage power sequencing safely. If either VCCA or VCCB drops to GND, both ports automatically enter high-impedance mode. Additionally, Ioff limits leakage current to ±1μA when a supply is unpowered, preventing backflow into active subsystems. To ensure reliable startup, OE should be tied to VCCA via a pullup resistor - a requirement explicitly defined for the SN74AVC4T245 in TI's recommended application guidance.
What is the maximum data rate achievable with the SN74AVC4T245, and under what conditions?
The SN74AVC4T245 achieves a maximum data rate of 380Mbps when translating signals from 1.8V to 3.3V. Lower rates apply for other combinations: 200Mbps for <1.8V→3.3V or ↔2.5V/1.8V, 150Mbps for ↔1.5V, and 100Mbps for ↔1.2V. These values are measured under specified load and transition conditions per TI's SCES576I datasheet - all verified performance metrics for the SN74AVC4T245, not theoretical estimates.
Does the SN74AVC4T245 require external components for basic operation?
Yes - the SN74AVC4T245 requires external bypass capacitors on both VCCA and VCCB (typically 0.1µF ceramic + 1µF bulk per rail) to suppress supply noise and ensure stable switching. A pullup resistor on OE (to VCCA) is also recommended to force high-impedance state during power-up until supplies stabilize. These requirements are documented in TI's application notes for the SN74AVC4T245 and are essential for reliable operation in production designs.
Can the SN74AVC4T245 replace the SN74LVC4T245 in an existing design?
No - the SN74AVC4T245 is not a drop-in replacement for the SN74LVC4T245. While pin-compatible in TSSOP packages, the SN74AVC4T245 requires separate VCCA and VCCB supplies and has different electrical characteristics (e.g., Ioff, VCC isolation, 4.6V tolerance). The SN74LVC4T245 operates from a single VCC (1.65–3.6V) and lacks dual-rail translation capability. Direct substitution would require schematic and layout changes to accommodate dual supplies and updated power sequencing - a key distinction confirmed in TI's family documentation for both the SN74AVC4T245 and SN74LVC4T245.
SN74AVC4T245PWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74AVC4T245PWRE4 FAQ
1.How can I place an order for SN74AVC4T245PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC4T245PWRE4 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 SN74AVC4T245PWRE4 reliable?
The price and inventory of SN74AVC4T245PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC4T245PWRE4 is usually 5 days.
3.What payment methods are accepted for SN74AVC4T245PWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVC4T245PWRE4 transactions.
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4.How is shipping managed for SN74AVC4T245PWRE4?
SN74AVC4T245PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVC4T245PWRE4 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 SN74AVC4T245PWRE4?
For technical support, including SN74AVC4T245PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC4T245PWRE4 requirements.
6.How does Aetrix verify that SN74AVC4T245PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AVC4T245PWRE4 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 SN74AVC4T245PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74AVC4T245PWRE4?
All SN74AVC4T245PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC4T245PWRE4, 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 SN74AVC4T245PWRE4 part is unused and in its original packaging.
Return procedure for SN74AVC4T245PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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