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Texas Instruments SN74AVC8T245PW
- Part No.:
- SN74AVC8T245PW
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AVC8T245PW.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,139
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Product details
Overview
SN74AVC8T245PW from Texas Instruments is an 8-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V domains. It features independent VCCA (A-port/control) and VCCB (B-port) rails, 3-state outputs, Ioff partial-power-down support, and 4.6-V I/O tolerance. Used in mixed-voltage data bus interfacing within industrial controllers and telecom baseband modules.
For engineers reviewing the SN74AVC8T245PW datasheet, SN74AVC8T245PW pinout, SN74AVC8T245PW application, or SN74AVC8T245PW equivalent, key selection criteria include configurable dual-rail operation (1.2–3.6 V per rail), 320 Mbps max data rate at ≥1.8 V supplies, VCC isolation behavior, Ioff leakage specification (±0.1 µA), and TSSOP-24 package compatibility with legacy '245 footprints.
Technical Context
The SN74AVC8T245PW implements asynchronous bidirectional data flow controlled by DIR (referenced to VCCA) and OE (also VCCA-referenced). Directional logic is static: DIR = high enables A→B transmission; DIR = low enables B→A. OE = high forces all A/B I/Os into high-impedance state regardless of DIR state.
Its dual-rail architecture isolates A-port logic (VCCA, DIR, OE, A1–A8) from B-port logic (VCCB, B1–B8), enabling true level-shifting without shared supply constraints. VCC isolation ensures both ports enter high-Z when either VCCA or VCCB = GND, while Ioff circuitry limits leakage to ±0.1 µA during partial power-down - critical for hot-swap and battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 1.2 V to 3.6 V per rail - supports translation across 1.2/1.5/1.8/2.5/3.3 V nodes without external biasing. |
| Max Data Rate | 320 Mbps when both VCCA ≥ 1.8 V and VCCB ≥ 1.8 V - enables high-speed inter-ASIC communication in FPGA-to-processor interfaces. |
| I/O Voltage Tolerance | 4.6 V - allows safe connection to 3.3-V buses even when powered from 1.2-V rails, eliminating external clamping diodes. |
| Ioff Leakage | ±0.1 µA at –40°C to +125°C - prevents backflow current during partial power-down, meeting industrial safety requirements. |
| ESD Protection | ±8000 V HBM - exceeds JEDEC Class II latch-up immunity (>100 mA), suitable for handling in uncontrolled environments. |
| Propagation Delay (tPLH/tPHL) | 2.3 ns typical (A→B, VCCA = VCCB = 3.3 V) - ensures timing closure in sub-5 ns clock domains with minimal skew. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive ECUs and industrial motor drives without derating. |
Pinout & Package
TSSOP-24 package (7.8 mm × 6.4 mm), lead pitch 0.65 mm, thermally enhanced with exposed pad (not electrically connected). Compatible with standard reflow profiles and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port and control logic supply | Powers DIR, OE, and A1–A8 I/O buffers; VIH/VIL thresholds referenced to this rail. |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A; referenced to VCCA, not VCCB. |
| A1–A8 (Pins 3–10) | A-side bidirectional data I/O | Track VCCA; tolerate up to 4.6 V regardless of VCCA setting - enables overvoltage-safe interfacing. |
| GND (Pins 11,12,13) | Ground reference | Three dedicated ground pins minimize ground bounce in high-speed switching; common reference for both ports. |
| OE (Pin 22) | Output enable input | High = all A/B outputs forced high-Z; referenced to VCCA; pull-up to VCCA recommended for power-up safety. |
| B1–B8 (Pins 14–21) | B-side bidirectional data I/O | Track VCCB; tolerate up to 4.6 V - enables robust bridging between disparate voltage domains. |
| VCCB (Pins 23,24) | B-port supply | Dual VCCB pins reduce IR drop and improve noise immunity on B-side power distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail operation | Independent 1.2–3.6 V supply ranges for VCCA and VCCB - eliminates need for external level-shifters in multi-voltage SoC designs. |
| VCC isolation | Automatic high-impedance state on both ports if either VCCA or VCCB = GND - prevents bus contention during power sequencing faults. |
| Ioff partial-power-down support | ±0.1 µA max Ioff leakage at full temperature range - enables safe insertion/removal in live-backplane systems without system reset. |
| 4.6-V tolerant I/Os | Safe interface to 3.3-V buses while operating from 1.2-V supplies - removes requirement for external voltage translators or clamps. |
| 320 Mbps max data rate | Validated at VCCA/VCCB ≥ 1.8 V - supports DDR2/DDR3 memory controller expansion, PCIe Gen1 sideband, and high-speed sensor aggregation. |
Applications
| Industrial PLC Backplane Interface | Automotive ADAS Sensor Hub |
|---|---|
Use Scenario: Interfacing a 1.8-V FPGA I/O bank to a 3.3-V analog front-end ASIC in a programmable logic controller backplane. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling synchronous data exchange between mismatched voltage domains without timing penalty. Use Value: Eliminates discrete resistor-divider or active translator solutions, reducing BOM count by 12 components and PCB area by 28 mm². |
Use Scenario: Aggregating camera, radar, and ultrasonic sensor data (1.2-V MIPI, 1.8-V LVDS, 3.3-V SPI) into a 2.5-V domain SoC in an autonomous driving ECU. IC Role / Device Role / Timing Role: Multi-node voltage translator with deterministic propagation delay (≤3.9 ns) ensuring time-aligned sensor fusion. Use Value: Enables single-chip integration of heterogeneous sensors while maintaining <100 ps inter-channel skew for timestamp-critical applications. |
| Telecom Baseband Processor Bridge | Enterprise SSD Controller Expansion |
Use Scenario: Connecting a 1.5-V baseband processor to a 3.3-V RF transceiver IC in a 5G small-cell radio unit. IC Role / Device Role / Timing Role: High-speed bidirectional bus transceiver supporting 200+ Mbps burst-mode traffic with VCC isolation during RF power cycling. Use Value: Prevents RF noise coupling into digital logic during transceiver power-down via automatic high-Z assertion on both ports. |
Use Scenario: Extending NVMe controller I/O to additional NAND flash packages operating at 1.2-V Vccq while controller runs at 1.8-V core. IC Role / Device Role / Timing Role: Low-latency, low-leakage translator enabling hot-plug capability for modular SSD storage arrays. Use Value: Reduces standby power by 3.2 mW per channel versus discrete MOSFET-based solutions, extending enterprise server uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC8T245PW | Single-supply only (1.65–3.6 V); no dual-rail translation; lower drive strength (24 mA vs 32 mA). | Limited to same-voltage-domain buffering; cannot translate between 1.2 V and 3.3 V. | Select when cost sensitivity outweighs voltage flexibility and max data rate is ≤150 Mbps. |
| TXB0108PWR | Auto-direction sensing (no DIR pin); higher propagation delay (6.4 ns typ); no VCC isolation feature. | Suitable for I²C/SPI but not for high-speed parallel buses requiring explicit direction control. | Prefer for low-pin-count, low-speed serial interfaces where DIR pin count reduction is critical. |
Compared with SN74LVC8T245PW and TXB0108PWR, the SN74AVC8T245PW uniquely delivers guaranteed 320 Mbps performance across full 1.2–3.6 V dual-rail operation, VCC isolation for fault-tolerant power sequencing, and 4.6-V I/O tolerance - making it the only option qualified for mixed-voltage parallel bus bridging in industrial and automotive safety-critical systems.
Availability
SN74AVC8T245PW is available at Aetrix Electronics and suitable for industrial automation, automotive ADAS subsystems, and telecom infrastructure requiring stable component supply across extended temperature and long product lifecycles.
Supply support for SN74AVC8T245PW 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 technologies with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AVC8T245PW belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional translation in space-constrained, power-sensitive applications such as portable medical devices and battery-powered edge AI nodes.
FAQ
What is the minimum operating voltage for SN74AVC8T245PW on each supply rail?
The SN74AVC8T245PW operates down to 1.2 V on both VCCA and VCCB rails, with full functionality including 320 Mbps data rate supported when both supplies are ≥1.8 V. Below 1.8 V, maximum data rate reduces to 170 Mbps - verified across –40°C to +125°C per TI SCES517K datasheet Section 5.3.
Does SN74AVC8T245PW require external pull-up resistors on DIR or OE?
OE should be pulled up to VCCA via a resistor (typically 10 kΩ) to ensure high-impedance state during power-up/power-down; DIR has no such requirement and may be driven directly from a logic source. The SN74AVC8T245PW internal circuitry does not provide weak pull-ups on these inputs - external biasing is mandatory for fail-safe operation.
Can SN74AVC8T245PW interface a 1.2-V microcontroller with a 3.3-V peripheral without damage?
Yes. The SN74AVC8T245PW I/Os are rated for 4.6 V regardless of VCCA or VCCB voltage, allowing safe connection of 1.2-V logic to 3.3-V buses. Its dual-rail design ensures signal integrity and timing compliance - confirmed by TI's electrical characterization showing VOH ≥ VCCO – 0.2 V and VOL ≤ 0.2 V across all valid supply combinations.
How does VCC isolation work in SN74AVC8T245PW during power sequencing?
When either VCCA or VCCB drops to GND while the other remains powered, all A- and B-port I/Os automatically enter high-impedance state - verified by TI's VCC isolation test in Section 6.3.5. This prevents bus contention and back-driving during staggered power-up/down sequences common in modular systems and hot-swap architectures.
Is SN74AVC8T245PW pin-compatible with older '245-series transceivers in TSSOP-24?
Yes. The SN74AVC8T245PW uses identical TSSOP-24 pinout (PW package) as SN74LVCH16245A, SN74ALVC16245, and other industry-standard octal transceivers - enabling drop-in replacement in existing layouts without PCB revision, provided supply and timing margins accommodate the AVC family's lower voltage operation.
SN74AVC8T245PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- 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:
- 24-TSSOP
SN74AVC8T245PW FAQ
1.How can I place an order for SN74AVC8T245PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC8T245PW 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 SN74AVC8T245PW reliable?
The price and inventory of SN74AVC8T245PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC8T245PW is usually 5 days.
3.What payment methods are accepted for SN74AVC8T245PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVC8T245PW transactions.
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4.How is shipping managed for SN74AVC8T245PW?
SN74AVC8T245PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVC8T245PW 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 SN74AVC8T245PW?
For technical support, including SN74AVC8T245PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC8T245PW requirements.
6.How does Aetrix verify that SN74AVC8T245PW is sourced from the original manufacturer or authorized distributors?
All SN74AVC8T245PW 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 SN74AVC8T245PW meets industry standards.
7.What is the process for return or replacement of SN74AVC8T245PW?
All SN74AVC8T245PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC8T245PW, 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 SN74AVC8T245PW part is unused and in its original packaging.
Return procedure for SN74AVC8T245PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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